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/* Print information from ELF file in human-readable form.
Copyright (C) 1999-2015 Red Hat, Inc.
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 1999.
This file is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <argp.h>
#include <assert.h>
#include <ctype.h>
#include <dwarf.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <gelf.h>
#include <inttypes.h>
#include <langinfo.h>
#include <libdw.h>
#include <libdwfl.h>
#include <libintl.h>
#include <locale.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <signal.h>
#include <system.h>
#include "../libelf/libelfP.h"
#include "../libelf/common.h"
#include "../libebl/libeblP.h"
#include "../libdwelf/libdwelf.h"
#include "../libdw/libdwP.h"
#include "../libdwfl/libdwflP.h"
#include "../libdw/memory-access.h"
#include "../libdw/known-dwarf.h"
/* Name and version of program. */
static void print_version (FILE *stream, struct argp_state *state);
ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
/* Bug report address. */
ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
/* argp key value for --elf-section, non-ascii. */
#define ELF_INPUT_SECTION 256
/* Definitions of arguments for argp functions. */
static const struct argp_option options[] =
{
{ NULL, 0, NULL, 0, N_("ELF input selection:"), 0 },
{ "elf-section", ELF_INPUT_SECTION, "SECTION", OPTION_ARG_OPTIONAL,
N_("Use the named SECTION (default .gnu_debugdata) as (compressed) ELF "
"input data"), 0 },
{ NULL, 0, NULL, 0, N_("ELF output selection:"), 0 },
{ "all", 'a', NULL, 0,
N_("All these plus -p .strtab -p .dynstr -p .comment"), 0 },
{ "dynamic", 'd', NULL, 0, N_("Display the dynamic segment"), 0 },
{ "file-header", 'h', NULL, 0, N_("Display the ELF file header"), 0 },
{ "histogram", 'I', NULL, 0,
N_("Display histogram of bucket list lengths"), 0 },
{ "program-headers", 'l', NULL, 0, N_("Display the program headers"), 0 },
{ "segments", 'l', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 },
{ "relocs", 'r', NULL, 0, N_("Display relocations"), 0 },
{ "section-headers", 'S', NULL, 0, N_("Display the sections' headers"), 0 },
{ "sections", 'S', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 },
{ "symbols", 's', NULL, 0, N_("Display the symbol table"), 0 },
{ "version-info", 'V', NULL, 0, N_("Display versioning information"), 0 },
{ "notes", 'n', NULL, 0, N_("Display the ELF notes"), 0 },
{ "arch-specific", 'A', NULL, 0,
N_("Display architecture specific information, if any"), 0 },
{ "exception", 'e', NULL, 0,
N_("Display sections for exception handling"), 0 },
{ NULL, 0, NULL, 0, N_("Additional output selection:"), 0 },
{ "debug-dump", 'w', "SECTION", OPTION_ARG_OPTIONAL,
N_("Display DWARF section content. SECTION can be one of abbrev, "
"aranges, decodedaranges, frame, gdb_index, info, loc, line, "
"decodedline, ranges, pubnames, str, macinfo, macro or exception"), 0 },
{ "hex-dump", 'x', "SECTION", 0,
N_("Dump the uninterpreted contents of SECTION, by number or name"), 0 },
{ "strings", 'p', "SECTION", OPTION_ARG_OPTIONAL,
N_("Print string contents of sections"), 0 },
{ "string-dump", 'p', NULL, OPTION_ALIAS | OPTION_HIDDEN, NULL, 0 },
{ "archive-index", 'c', NULL, 0,
N_("Display the symbol index of an archive"), 0 },
{ NULL, 0, NULL, 0, N_("Output control:"), 0 },
{ "numeric-addresses", 'N', NULL, 0,
N_("Do not find symbol names for addresses in DWARF data"), 0 },
{ "unresolved-address-offsets", 'U', NULL, 0,
N_("Display just offsets instead of resolving values to addresses in DWARF data"), 0 },
{ "wide", 'W', NULL, 0,
N_("Ignored for compatibility (lines always wide)"), 0 },
{ "decompress", 'z', NULL, 0,
N_("Show compression information for compressed sections (when used with -S); decompress section before dumping data (when used with -p or -x)"), 0 },
{ NULL, 0, NULL, 0, NULL, 0 }
};
/* Short description of program. */
static const char doc[] = N_("\
Print information from ELF file in human-readable form.");
/* Strings for arguments in help texts. */
static const char args_doc[] = N_("FILE...");
/* Prototype for option handler. */
static error_t parse_opt (int key, char *arg, struct argp_state *state);
/* Data structure to communicate with argp functions. */
static struct argp argp =
{
options, parse_opt, args_doc, doc, NULL, NULL, NULL
};
/* If non-null, the section from which we should read to (compressed) ELF. */
static const char *elf_input_section = NULL;
/* Flags set by the option controlling the output. */
/* True if dynamic segment should be printed. */
static bool print_dynamic_table;
/* True if the file header should be printed. */
static bool print_file_header;
/* True if the program headers should be printed. */
static bool print_program_header;
/* True if relocations should be printed. */
static bool print_relocations;
/* True if the section headers should be printed. */
static bool print_section_header;
/* True if the symbol table should be printed. */
static bool print_symbol_table;
/* True if the version information should be printed. */
static bool print_version_info;
/* True if section groups should be printed. */
static bool print_section_groups;
/* True if bucket list length histogram should be printed. */
static bool print_histogram;
/* True if the architecture specific data should be printed. */
static bool print_arch;
/* True if note section content should be printed. */
static bool print_notes;
/* True if SHF_STRINGS section content should be printed. */
static bool print_string_sections;
/* True if archive index should be printed. */
static bool print_archive_index;
/* True if any of the control options except print_archive_index is set. */
static bool any_control_option;
/* True if we should print addresses from DWARF in symbolic form. */
static bool print_address_names = true;
/* True if we should print raw values instead of relativized addresses. */
static bool print_unresolved_addresses = false;
/* True if we should print the .debug_aranges section using libdw. */
static bool decodedaranges = false;
/* True if we should print the .debug_aranges section using libdw. */
static bool decodedline = false;
/* True if we want to show more information about compressed sections. */
static bool print_decompress = false;
/* Select printing of debugging sections. */
static enum section_e
{
section_abbrev = 1, /* .debug_abbrev */
section_aranges = 2, /* .debug_aranges */
section_frame = 4, /* .debug_frame or .eh_frame & al. */
section_info = 8, /* .debug_info, .debug_types */
section_types = section_info,
section_line = 16, /* .debug_line */
section_loc = 32, /* .debug_loc */
section_pubnames = 64, /* .debug_pubnames */
section_str = 128, /* .debug_str */
section_macinfo = 256, /* .debug_macinfo */
section_ranges = 512, /* .debug_ranges */
section_exception = 1024, /* .eh_frame & al. */
section_gdb_index = 2048, /* .gdb_index */
section_macro = 4096, /* .debug_macro */
section_all = (section_abbrev | section_aranges | section_frame
| section_info | section_line | section_loc
| section_pubnames | section_str | section_macinfo
| section_ranges | section_exception | section_gdb_index
| section_macro)
} print_debug_sections, implicit_debug_sections;
/* Select hex dumping of sections. */
static struct section_argument *dump_data_sections;
static struct section_argument **dump_data_sections_tail = &dump_data_sections;
/* Select string dumping of sections. */
static struct section_argument *string_sections;
static struct section_argument **string_sections_tail = &string_sections;
struct section_argument
{
struct section_argument *next;
const char *arg;
bool implicit;
};
/* Numbers of sections and program headers in the file. */
static size_t shnum;
static size_t phnum;
/* Declarations of local functions. */
static void process_file (int fd, const char *fname, bool only_one);
static void process_elf_file (Dwfl_Module *dwflmod, int fd);
static void print_ehdr (Ebl *ebl, GElf_Ehdr *ehdr);
static void print_shdr (Ebl *ebl, GElf_Ehdr *ehdr);
static void print_phdr (Ebl *ebl, GElf_Ehdr *ehdr);
static void print_scngrp (Ebl *ebl);
static void print_dynamic (Ebl *ebl);
static void print_relocs (Ebl *ebl, GElf_Ehdr *ehdr);
static void handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn,
GElf_Shdr *shdr);
static void handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn,
GElf_Shdr *shdr);
static void print_symtab (Ebl *ebl, int type);
static void handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr);
static void print_verinfo (Ebl *ebl);
static void handle_verneed (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr);
static void handle_verdef (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr);
static void handle_versym (Ebl *ebl, Elf_Scn *scn,
GElf_Shdr *shdr);
static void print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr);
static void handle_hash (Ebl *ebl);
static void handle_notes (Ebl *ebl, GElf_Ehdr *ehdr);
static void print_liblist (Ebl *ebl);
static void print_attributes (Ebl *ebl, const GElf_Ehdr *ehdr);
static void dump_data (Ebl *ebl);
static void dump_strings (Ebl *ebl);
static void print_strings (Ebl *ebl);
static void dump_archive_index (Elf *, const char *);
int
main (int argc, char *argv[])
{
/* Set locale. */
setlocale (LC_ALL, "");
/* Initialize the message catalog. */
textdomain (PACKAGE_TARNAME);
/* Parse and process arguments. */
int remaining;
argp_parse (&argp, argc, argv, 0, &remaining, NULL);
/* Before we start tell the ELF library which version we are using. */
elf_version (EV_CURRENT);
/* Now process all the files given at the command line. */
bool only_one = remaining + 1 == argc;
do
{
/* Open the file. */
int fd = open (argv[remaining], O_RDONLY);
if (fd == -1)
{
error (0, errno, gettext ("cannot open input file"));
continue;
}
process_file (fd, argv[remaining], only_one);
close (fd);
}
while (++remaining < argc);
return error_message_count != 0;
}
/* Handle program arguments. */
static error_t
parse_opt (int key, char *arg,
struct argp_state *state __attribute__ ((unused)))
{
void add_dump_section (const char *name, bool implicit)
{
struct section_argument *a = xmalloc (sizeof *a);
a->arg = name;
a->next = NULL;
a->implicit = implicit;
struct section_argument ***tailp
= key == 'x' ? &dump_data_sections_tail : &string_sections_tail;
**tailp = a;
*tailp = &a->next;
}
switch (key)
{
case 'a':
print_file_header = true;
print_program_header = true;
print_relocations = true;
print_section_header = true;
print_symbol_table = true;
print_version_info = true;
print_dynamic_table = true;
print_section_groups = true;
print_histogram = true;
print_arch = true;
print_notes = true;
implicit_debug_sections |= section_exception;
add_dump_section (".strtab", true);
add_dump_section (".dynstr", true);
add_dump_section (".comment", true);
any_control_option = true;
break;
case 'A':
print_arch = true;
any_control_option = true;
break;
case 'd':
print_dynamic_table = true;
any_control_option = true;
break;
case 'e':
print_debug_sections |= section_exception;
any_control_option = true;
break;
case 'g':
print_section_groups = true;
any_control_option = true;
break;
case 'h':
print_file_header = true;
any_control_option = true;
break;
case 'I':
print_histogram = true;
any_control_option = true;
break;
case 'l':
print_program_header = true;
any_control_option = true;
break;
case 'n':
print_notes = true;
any_control_option = true;
break;
case 'r':
print_relocations = true;
any_control_option = true;
break;
case 'S':
print_section_header = true;
any_control_option = true;
break;
case 's':
print_symbol_table = true;
any_control_option = true;
break;
case 'V':
print_version_info = true;
any_control_option = true;
break;
case 'c':
print_archive_index = true;
break;
case 'w':
if (arg == NULL)
print_debug_sections = section_all;
else if (strcmp (arg, "abbrev") == 0)
print_debug_sections |= section_abbrev;
else if (strcmp (arg, "aranges") == 0)
print_debug_sections |= section_aranges;
else if (strcmp (arg, "decodedaranges") == 0)
{
print_debug_sections |= section_aranges;
decodedaranges = true;
}
else if (strcmp (arg, "ranges") == 0)
{
print_debug_sections |= section_ranges;
implicit_debug_sections |= section_info;
}
else if (strcmp (arg, "frame") == 0 || strcmp (arg, "frames") == 0)
print_debug_sections |= section_frame;
else if (strcmp (arg, "info") == 0)
print_debug_sections |= section_info;
else if (strcmp (arg, "loc") == 0)
{
print_debug_sections |= section_loc;
implicit_debug_sections |= section_info;
}
else if (strcmp (arg, "line") == 0)
print_debug_sections |= section_line;
else if (strcmp (arg, "decodedline") == 0)
{
print_debug_sections |= section_line;
decodedline = true;
}
else if (strcmp (arg, "pubnames") == 0)
print_debug_sections |= section_pubnames;
else if (strcmp (arg, "str") == 0)
print_debug_sections |= section_str;
else if (strcmp (arg, "macinfo") == 0)
print_debug_sections |= section_macinfo;
else if (strcmp (arg, "macro") == 0)
print_debug_sections |= section_macro;
else if (strcmp (arg, "exception") == 0)
print_debug_sections |= section_exception;
else if (strcmp (arg, "gdb_index") == 0)
print_debug_sections |= section_gdb_index;
else
{
fprintf (stderr, gettext ("Unknown DWARF debug section `%s'.\n"),
arg);
argp_help (&argp, stderr, ARGP_HELP_SEE,
program_invocation_short_name);
exit (1);
}
any_control_option = true;
break;
case 'p':
any_control_option = true;
if (arg == NULL)
{
print_string_sections = true;
break;
}
/* Fall through. */
case 'x':
add_dump_section (arg, false);
any_control_option = true;
break;
case 'N':
print_address_names = false;
break;
case 'U':
print_unresolved_addresses = true;
break;
case ARGP_KEY_NO_ARGS:
fputs (gettext ("Missing file name.\n"), stderr);
goto do_argp_help;
case ARGP_KEY_FINI:
if (! any_control_option && ! print_archive_index)
{
fputs (gettext ("No operation specified.\n"), stderr);
do_argp_help:
argp_help (&argp, stderr, ARGP_HELP_SEE,
program_invocation_short_name);
exit (EXIT_FAILURE);
}
break;
case 'W': /* Ignored. */
break;
case 'z':
print_decompress = true;
break;
case ELF_INPUT_SECTION:
if (arg == NULL)
elf_input_section = ".gnu_debugdata";
else
elf_input_section = arg;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
/* Print the version information. */
static void
print_version (FILE *stream, struct argp_state *state __attribute__ ((unused)))
{
fprintf (stream, "readelf (%s) %s\n", PACKAGE_NAME, PACKAGE_VERSION);
fprintf (stream, gettext ("\
Copyright (C) %s Red Hat, Inc.\n\
This is free software; see the source for copying conditions. There is NO\n\
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\
"), "2012");
fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper");
}
/* Create a file descriptor to read the data from the
elf_input_section given a file descriptor to an ELF file. */
static int
open_input_section (int fd)
{
size_t shnums;
size_t cnt;
size_t shstrndx;
Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL)
{
error (0, 0, gettext ("cannot generate Elf descriptor: %s"),
elf_errmsg (-1));
return -1;
}
if (elf_getshdrnum (elf, &shnums) < 0)
{
error (0, 0, gettext ("cannot determine number of sections: %s"),
elf_errmsg (-1));
open_error:
elf_end (elf);
return -1;
}
if (elf_getshdrstrndx (elf, &shstrndx) < 0)
{
error (0, 0, gettext ("cannot get section header string table index"));
goto open_error;
}
for (cnt = 0; cnt < shnums; ++cnt)
{
Elf_Scn *scn = elf_getscn (elf, cnt);
if (scn == NULL)
{
error (0, 0, gettext ("cannot get section: %s"),
elf_errmsg (-1));
goto open_error;
}
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (unlikely (shdr == NULL))
{
error (0, 0, gettext ("cannot get section header: %s"),
elf_errmsg (-1));
goto open_error;
}
const char *sname = elf_strptr (elf, shstrndx, shdr->sh_name);
if (sname == NULL)
{
error (0, 0, gettext ("cannot get section name"));
goto open_error;
}
if (strcmp (sname, elf_input_section) == 0)
{
Elf_Data *data = elf_rawdata (scn, NULL);
if (data == NULL)
{
error (0, 0, gettext ("cannot get %s content: %s"),
sname, elf_errmsg (-1));
goto open_error;
}
/* Create (and immediately unlink) a temporary file to store
section data in to create a file descriptor for it. */
const char *tmpdir = getenv ("TMPDIR") ?: P_tmpdir;
static const char suffix[] = "/readelfXXXXXX";
int tmplen = strlen (tmpdir) + sizeof (suffix);
char *tempname = alloca (tmplen);
sprintf (tempname, "%s%s", tmpdir, suffix);
int sfd = mkstemp (tempname);
if (sfd == -1)
{
error (0, 0, gettext ("cannot create temp file '%s'"),
tempname);
goto open_error;
}
unlink (tempname);
ssize_t size = data->d_size;
if (write_retry (sfd, data->d_buf, size) != size)
{
error (0, 0, gettext ("cannot write section data"));
goto open_error;
}
if (elf_end (elf) != 0)
{
error (0, 0, gettext ("error while closing Elf descriptor: %s"),
elf_errmsg (-1));
return -1;
}
if (lseek (sfd, 0, SEEK_SET) == -1)
{
error (0, 0, gettext ("error while rewinding file descriptor"));
return -1;
}
return sfd;
}
}
/* Named section not found. */
if (elf_end (elf) != 0)
error (0, 0, gettext ("error while closing Elf descriptor: %s"),
elf_errmsg (-1));
return -1;
}
/* Check if the file is an archive, and if so dump its index. */
static void
check_archive_index (int fd, const char *fname, bool only_one)
{
/* Create an `Elf' descriptor. */
Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL)
error (0, 0, gettext ("cannot generate Elf descriptor: %s"),
elf_errmsg (-1));
else
{
if (elf_kind (elf) == ELF_K_AR)
{
if (!only_one)
printf ("\n%s:\n\n", fname);
dump_archive_index (elf, fname);
}
else
error (0, 0,
gettext ("'%s' is not an archive, cannot print archive index"),
fname);
/* Now we can close the descriptor. */
if (elf_end (elf) != 0)
error (0, 0, gettext ("error while closing Elf descriptor: %s"),
elf_errmsg (-1));
}
}
/* Trivial callback used for checking if we opened an archive. */
static int
count_dwflmod (Dwfl_Module *dwflmod __attribute__ ((unused)),
void **userdata __attribute__ ((unused)),
const char *name __attribute__ ((unused)),
Dwarf_Addr base __attribute__ ((unused)),
void *arg)
{
if (*(bool *) arg)
return DWARF_CB_ABORT;
*(bool *) arg = true;
return DWARF_CB_OK;
}
struct process_dwflmod_args
{
int fd;
bool only_one;
};
static int
process_dwflmod (Dwfl_Module *dwflmod,
void **userdata __attribute__ ((unused)),
const char *name __attribute__ ((unused)),
Dwarf_Addr base __attribute__ ((unused)),
void *arg)
{
const struct process_dwflmod_args *a = arg;
/* Print the file name. */
if (!a->only_one)
{
const char *fname;
dwfl_module_info (dwflmod, NULL, NULL, NULL, NULL, NULL, &fname, NULL);
printf ("\n%s:\n\n", fname);
}
process_elf_file (dwflmod, a->fd);
return DWARF_CB_OK;
}
/* Stub libdwfl callback, only the ELF handle already open is ever used.
Only used for finding the alternate debug file if the Dwarf comes from
the main file. We are not interested in separate debuginfo. */
static int
find_no_debuginfo (Dwfl_Module *mod,
void **userdata,
const char *modname,
Dwarf_Addr base,
const char *file_name,
const char *debuglink_file,
GElf_Word debuglink_crc,
char **debuginfo_file_name)
{
Dwarf_Addr dwbias;
dwfl_module_info (mod, NULL, NULL, NULL, &dwbias, NULL, NULL, NULL);
/* We are only interested if the Dwarf has been setup on the main
elf file but is only missing the alternate debug link. If dwbias
hasn't even been setup, this is searching for separate debuginfo
for the main elf. We don't care in that case. */
if (dwbias == (Dwarf_Addr) -1)
return -1;
return dwfl_standard_find_debuginfo (mod, userdata, modname, base,
file_name, debuglink_file,
debuglink_crc, debuginfo_file_name);
}
/* Process one input file. */
static void
process_file (int fd, const char *fname, bool only_one)
{
if (print_archive_index)
check_archive_index (fd, fname, only_one);
if (!any_control_option)
return;
if (elf_input_section != NULL)
{
/* Replace fname and fd with section content. */
char *fnname = alloca (strlen (fname) + strlen (elf_input_section) + 2);
sprintf (fnname, "%s:%s", fname, elf_input_section);
fd = open_input_section (fd);
if (fd == -1)
{
error (0, 0, gettext ("No such section '%s' in '%s'"),
elf_input_section, fname);
return;
}
fname = fnname;
}
/* Duplicate an fd for dwfl_report_offline to swallow. */
int dwfl_fd = dup (fd);
if (unlikely (dwfl_fd < 0))
error (EXIT_FAILURE, errno, "dup");
/* Use libdwfl in a trivial way to open the libdw handle for us.
This takes care of applying relocations to DWARF data in ET_REL files. */
static const Dwfl_Callbacks callbacks =
{
.section_address = dwfl_offline_section_address,
.find_debuginfo = find_no_debuginfo
};
Dwfl *dwfl = dwfl_begin (&callbacks);
if (likely (dwfl != NULL))
/* Let 0 be the logical address of the file (or first in archive). */
dwfl->offline_next_address = 0;
if (dwfl_report_offline (dwfl, fname, fname, dwfl_fd) == NULL)
{
struct stat st;
if (fstat (dwfl_fd, &st) != 0)
error (0, errno, gettext ("cannot stat input file"));
else if (unlikely (st.st_size == 0))
error (0, 0, gettext ("input file is empty"));
else
error (0, 0, gettext ("failed reading '%s': %s"),
fname, dwfl_errmsg (-1));
close (dwfl_fd); /* Consumed on success, not on failure. */
}
else
{
dwfl_report_end (dwfl, NULL, NULL);
if (only_one)
{
/* Clear ONLY_ONE if we have multiple modules, from an archive. */
bool seen = false;
only_one = dwfl_getmodules (dwfl, &count_dwflmod, &seen, 0) == 0;
}
/* Process the one or more modules gleaned from this file. */
struct process_dwflmod_args a = { .fd = fd, .only_one = only_one };
dwfl_getmodules (dwfl, &process_dwflmod, &a, 0);
}
dwfl_end (dwfl);
/* Need to close the replaced fd if we created it. Caller takes
care of original. */
if (elf_input_section != NULL)
close (fd);
}
/* Check whether there are any compressed sections in the ELF file. */
static bool
elf_contains_chdrs (Elf *elf)
{
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (elf, scn)) != NULL)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr != NULL && (shdr->sh_flags & SHF_COMPRESSED) != 0)
return true;
}
return false;
}
/* Process one ELF file. */
static void
process_elf_file (Dwfl_Module *dwflmod, int fd)
{
GElf_Addr dwflbias;
Elf *elf = dwfl_module_getelf (dwflmod, &dwflbias);
GElf_Ehdr ehdr_mem;
GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
if (ehdr == NULL)
{
elf_error:
error (0, 0, gettext ("cannot read ELF header: %s"), elf_errmsg (-1));
return;
}
Ebl *ebl = ebl_openbackend (elf);
if (unlikely (ebl == NULL))
{
ebl_error:
error (0, errno, gettext ("cannot create EBL handle"));
return;
}
/* Determine the number of sections. */
if (unlikely (elf_getshdrnum (ebl->elf, &shnum) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot determine number of sections: %s"),
elf_errmsg (-1));
/* Determine the number of phdrs. */
if (unlikely (elf_getphdrnum (ebl->elf, &phnum) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot determine number of program headers: %s"),
elf_errmsg (-1));
/* For an ET_REL file, libdwfl has adjusted the in-core shdrs and
may have applied relocation to some sections. If there are any
compressed sections, any pass (or libdw/libdwfl) might have
uncompressed them. So we need to get a fresh Elf handle on the
file to display those. */
bool print_unchanged = ((print_section_header
|| print_relocations
|| dump_data_sections != NULL
|| print_notes)
&& (ehdr->e_type == ET_REL
|| elf_contains_chdrs (ebl->elf)));
Elf *pure_elf = NULL;
Ebl *pure_ebl = ebl;
if (print_unchanged)
{
/* Read the file afresh. */
off_t aroff = elf_getaroff (elf);
pure_elf = elf_begin (fd, ELF_C_READ_MMAP, NULL);
if (aroff > 0)
{
/* Archive member. */
(void) elf_rand (pure_elf, aroff);
Elf *armem = elf_begin (-1, ELF_C_READ_MMAP, pure_elf);
elf_end (pure_elf);
pure_elf = armem;
}
if (pure_elf == NULL)
goto elf_error;
pure_ebl = ebl_openbackend (pure_elf);
if (pure_ebl == NULL)
goto ebl_error;
}
if (print_file_header)
print_ehdr (ebl, ehdr);
if (print_section_header)
print_shdr (pure_ebl, ehdr);
if (print_program_header)
print_phdr (ebl, ehdr);
if (print_section_groups)
print_scngrp (ebl);
if (print_dynamic_table)
print_dynamic (ebl);
if (print_relocations)
print_relocs (pure_ebl, ehdr);
if (print_histogram)
handle_hash (ebl);
if (print_symbol_table)
print_symtab (ebl, SHT_DYNSYM);
if (print_version_info)
print_verinfo (ebl);
if (print_symbol_table)
print_symtab (ebl, SHT_SYMTAB);
if (print_arch)
print_liblist (ebl);
if (print_arch)
print_attributes (ebl, ehdr);
if (dump_data_sections != NULL)
dump_data (pure_ebl);
if (string_sections != NULL)
dump_strings (ebl);
if ((print_debug_sections | implicit_debug_sections) != 0)
print_debug (dwflmod, ebl, ehdr);
if (print_notes)
handle_notes (pure_ebl, ehdr);
if (print_string_sections)
print_strings (ebl);
ebl_closebackend (ebl);
if (pure_ebl != ebl)
{
ebl_closebackend (pure_ebl);
elf_end (pure_elf);
}
}
/* Print file type. */
static void
print_file_type (unsigned short int e_type)
{
if (likely (e_type <= ET_CORE))
{
static const char *const knowntypes[] =
{
N_("NONE (None)"),
N_("REL (Relocatable file)"),
N_("EXEC (Executable file)"),
N_("DYN (Shared object file)"),
N_("CORE (Core file)")
};
puts (gettext (knowntypes[e_type]));
}
else if (e_type >= ET_LOOS && e_type <= ET_HIOS)
printf (gettext ("OS Specific: (%x)\n"), e_type);
else if (e_type >= ET_LOPROC /* && e_type <= ET_HIPROC always true */)
printf (gettext ("Processor Specific: (%x)\n"), e_type);
else
puts ("???");
}
/* Print ELF header. */
static void
print_ehdr (Ebl *ebl, GElf_Ehdr *ehdr)
{
fputs_unlocked (gettext ("ELF Header:\n Magic: "), stdout);
for (size_t cnt = 0; cnt < EI_NIDENT; ++cnt)
printf (" %02hhx", ehdr->e_ident[cnt]);
printf (gettext ("\n Class: %s\n"),
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? "ELF32"
: ehdr->e_ident[EI_CLASS] == ELFCLASS64 ? "ELF64"
: "\?\?\?");
printf (gettext (" Data: %s\n"),
ehdr->e_ident[EI_DATA] == ELFDATA2LSB
? "2's complement, little endian"
: ehdr->e_ident[EI_DATA] == ELFDATA2MSB
? "2's complement, big endian" : "\?\?\?");
printf (gettext (" Ident Version: %hhd %s\n"),
ehdr->e_ident[EI_VERSION],
ehdr->e_ident[EI_VERSION] == EV_CURRENT ? gettext ("(current)")
: "(\?\?\?)");
char buf[512];
printf (gettext (" OS/ABI: %s\n"),
ebl_osabi_name (ebl, ehdr->e_ident[EI_OSABI], buf, sizeof (buf)));
printf (gettext (" ABI Version: %hhd\n"),
ehdr->e_ident[EI_ABIVERSION]);
fputs_unlocked (gettext (" Type: "), stdout);
print_file_type (ehdr->e_type);
printf (gettext (" Machine: %s\n"), ebl->name);
printf (gettext (" Version: %d %s\n"),
ehdr->e_version,
ehdr->e_version == EV_CURRENT ? gettext ("(current)") : "(\?\?\?)");
printf (gettext (" Entry point address: %#" PRIx64 "\n"),
ehdr->e_entry);
printf (gettext (" Start of program headers: %" PRId64 " %s\n"),
ehdr->e_phoff, gettext ("(bytes into file)"));
printf (gettext (" Start of section headers: %" PRId64 " %s\n"),
ehdr->e_shoff, gettext ("(bytes into file)"));
printf (gettext (" Flags: %s\n"),
ebl_machine_flag_name (ebl, ehdr->e_flags, buf, sizeof (buf)));
printf (gettext (" Size of this header: %" PRId16 " %s\n"),
ehdr->e_ehsize, gettext ("(bytes)"));
printf (gettext (" Size of program header entries: %" PRId16 " %s\n"),
ehdr->e_phentsize, gettext ("(bytes)"));
printf (gettext (" Number of program headers entries: %" PRId16),
ehdr->e_phnum);
if (ehdr->e_phnum == PN_XNUM)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem);
if (shdr != NULL)
printf (gettext (" (%" PRIu32 " in [0].sh_info)"),
(uint32_t) shdr->sh_info);
else
fputs_unlocked (gettext (" ([0] not available)"), stdout);
}
fputc_unlocked ('\n', stdout);
printf (gettext (" Size of section header entries: %" PRId16 " %s\n"),
ehdr->e_shentsize, gettext ("(bytes)"));
printf (gettext (" Number of section headers entries: %" PRId16),
ehdr->e_shnum);
if (ehdr->e_shnum == 0)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem);
if (shdr != NULL)
printf (gettext (" (%" PRIu32 " in [0].sh_size)"),
(uint32_t) shdr->sh_size);
else
fputs_unlocked (gettext (" ([0] not available)"), stdout);
}
fputc_unlocked ('\n', stdout);
if (unlikely (ehdr->e_shstrndx == SHN_XINDEX))
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (elf_getscn (ebl->elf, 0), &shdr_mem);
if (shdr != NULL)
/* We managed to get the zeroth section. */
snprintf (buf, sizeof (buf), gettext (" (%" PRIu32 " in [0].sh_link)"),
(uint32_t) shdr->sh_link);
else
{
strncpy (buf, gettext (" ([0] not available)"), sizeof (buf));
buf[sizeof (buf) - 1] = '\0';
}
printf (gettext (" Section header string table index: XINDEX%s\n\n"),
buf);
}
else
printf (gettext (" Section header string table index: %" PRId16 "\n\n"),
ehdr->e_shstrndx);
}
static const char *
get_visibility_type (int value)
{
switch (value)
{
case STV_DEFAULT:
return "DEFAULT";
case STV_INTERNAL:
return "INTERNAL";
case STV_HIDDEN:
return "HIDDEN";
case STV_PROTECTED:
return "PROTECTED";
default:
return "???";
}
}
static const char *
elf_ch_type_name (unsigned int code)
{
if (code == 0)
return "NONE";
if (code == ELFCOMPRESS_ZLIB)
return "ZLIB";
return "UNKNOWN";
}
/* Print the section headers. */
static void
print_shdr (Ebl *ebl, GElf_Ehdr *ehdr)
{
size_t cnt;
size_t shstrndx;
if (! print_file_header)
printf (gettext ("\
There are %d section headers, starting at offset %#" PRIx64 ":\n\
\n"),
ehdr->e_shnum, ehdr->e_shoff);
/* Get the section header string table index. */
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
puts (gettext ("Section Headers:"));
if (ehdr->e_ident[EI_CLASS] == ELFCLASS32)
puts (gettext ("[Nr] Name Type Addr Off Size ES Flags Lk Inf Al"));
else
puts (gettext ("[Nr] Name Type Addr Off Size ES Flags Lk Inf Al"));
if (print_decompress)
{
if (ehdr->e_ident[EI_CLASS] == ELFCLASS32)
puts (gettext (" [Compression Size Al]"));
else
puts (gettext (" [Compression Size Al]"));
}
for (cnt = 0; cnt < shnum; ++cnt)
{
Elf_Scn *scn = elf_getscn (ebl->elf, cnt);
if (unlikely (scn == NULL))
error (EXIT_FAILURE, 0, gettext ("cannot get section: %s"),
elf_errmsg (-1));
/* Get the section header. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (unlikely (shdr == NULL))
error (EXIT_FAILURE, 0, gettext ("cannot get section header: %s"),
elf_errmsg (-1));
char flagbuf[20];
char *cp = flagbuf;
if (shdr->sh_flags & SHF_WRITE)
*cp++ = 'W';
if (shdr->sh_flags & SHF_ALLOC)
*cp++ = 'A';
if (shdr->sh_flags & SHF_EXECINSTR)
*cp++ = 'X';
if (shdr->sh_flags & SHF_MERGE)
*cp++ = 'M';
if (shdr->sh_flags & SHF_STRINGS)
*cp++ = 'S';
if (shdr->sh_flags & SHF_INFO_LINK)
*cp++ = 'I';
if (shdr->sh_flags & SHF_LINK_ORDER)
*cp++ = 'L';
if (shdr->sh_flags & SHF_OS_NONCONFORMING)
*cp++ = 'N';
if (shdr->sh_flags & SHF_GROUP)
*cp++ = 'G';
if (shdr->sh_flags & SHF_TLS)
*cp++ = 'T';
if (shdr->sh_flags & SHF_COMPRESSED)
*cp++ = 'C';
if (shdr->sh_flags & SHF_ORDERED)
*cp++ = 'O';
if (shdr->sh_flags & SHF_EXCLUDE)
*cp++ = 'E';
*cp = '\0';
const char *sname;
char buf[128];
sname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name) ?: "<corrupt>";
printf ("[%2zu] %-20s %-12s %0*" PRIx64 " %0*" PRIx64 " %0*" PRIx64
" %2" PRId64 " %-5s %2" PRId32 " %3" PRId32
" %2" PRId64 "\n",
cnt, sname,
ebl_section_type_name (ebl, shdr->sh_type, buf, sizeof (buf)),
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16, shdr->sh_addr,
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, shdr->sh_offset,
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, shdr->sh_size,
shdr->sh_entsize, flagbuf, shdr->sh_link, shdr->sh_info,
shdr->sh_addralign);
if (print_decompress)
{
if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
{
GElf_Chdr chdr;
if (gelf_getchdr (scn, &chdr) != NULL)
printf (" [ELF %s (%" PRId32 ") %0*" PRIx64
" %2" PRId64 "]\n",
elf_ch_type_name (chdr.ch_type),
chdr.ch_type,
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8,
chdr.ch_size, chdr.ch_addralign);
else
error (0, 0,
gettext ("bad compression header for section %zd: %s"),
elf_ndxscn (scn), elf_errmsg (-1));
}
else if (strncmp(".zdebug", sname, strlen (".zdebug")) == 0)
{
ssize_t size;
if ((size = dwelf_scn_gnu_compressed_size (scn)) >= 0)
printf (" [GNU ZLIB %0*zx ]\n",
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 6 : 8, size);
else
error (0, 0,
gettext ("bad gnu compressed size for section %zd: %s"),
elf_ndxscn (scn), elf_errmsg (-1));
}
}
}
fputc_unlocked ('\n', stdout);
}
/* Print the program header. */
static void
print_phdr (Ebl *ebl, GElf_Ehdr *ehdr)
{
if (phnum == 0)
/* No program header, this is OK in relocatable objects. */
return;
puts (gettext ("Program Headers:"));
if (ehdr->e_ident[EI_CLASS] == ELFCLASS32)
puts (gettext ("\
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align"));
else
puts (gettext ("\
Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align"));
/* Process all program headers. */
bool has_relro = false;
GElf_Addr relro_from = 0;
GElf_Addr relro_to = 0;
for (size_t cnt = 0; cnt < phnum; ++cnt)
{
char buf[128];
GElf_Phdr mem;
GElf_Phdr *phdr = gelf_getphdr (ebl->elf, cnt, &mem);
/* If for some reason the header cannot be returned show this. */
if (unlikely (phdr == NULL))
{
puts (" ???");
continue;
}
printf (" %-14s 0x%06" PRIx64 " 0x%0*" PRIx64 " 0x%0*" PRIx64
" 0x%06" PRIx64 " 0x%06" PRIx64 " %c%c%c 0x%" PRIx64 "\n",
ebl_segment_type_name (ebl, phdr->p_type, buf, sizeof (buf)),
phdr->p_offset,
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16, phdr->p_vaddr,
ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 8 : 16, phdr->p_paddr,
phdr->p_filesz,
phdr->p_memsz,
phdr->p_flags & PF_R ? 'R' : ' ',
phdr->p_flags & PF_W ? 'W' : ' ',
phdr->p_flags & PF_X ? 'E' : ' ',
phdr->p_align);
if (phdr->p_type == PT_INTERP)
{
/* If we are sure the file offset is valid then we can show
the user the name of the interpreter. We check whether
there is a section at the file offset. Normally there
would be a section called ".interp". But in separate
.debug files it is a NOBITS section (and so doesn't match
with gelf_offscn). Which probably means the offset is
not valid another reason could be because the ELF file
just doesn't contain any section headers, in that case
just play it safe and don't display anything. */
Elf_Scn *scn = gelf_offscn (ebl->elf, phdr->p_offset);
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
size_t maxsize;
char *filedata = elf_rawfile (ebl->elf, &maxsize);
if (shdr != NULL && shdr->sh_type == SHT_PROGBITS
&& filedata != NULL && phdr->p_offset < maxsize
&& phdr->p_filesz <= maxsize - phdr->p_offset
&& memchr (filedata + phdr->p_offset, '\0',
phdr->p_filesz) != NULL)
printf (gettext ("\t[Requesting program interpreter: %s]\n"),
filedata + phdr->p_offset);
}
else if (phdr->p_type == PT_GNU_RELRO)
{
has_relro = true;
relro_from = phdr->p_vaddr;
relro_to = relro_from + phdr->p_memsz;
}
}
if (ehdr->e_shnum == 0)
/* No sections in the file. Punt. */
return;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
puts (gettext ("\n Section to Segment mapping:\n Segment Sections..."));
for (size_t cnt = 0; cnt < phnum; ++cnt)
{
/* Print the segment number. */
printf (" %2.2zu ", cnt);
GElf_Phdr phdr_mem;
GElf_Phdr *phdr = gelf_getphdr (ebl->elf, cnt, &phdr_mem);
/* This must not happen. */
if (unlikely (phdr == NULL))
error (EXIT_FAILURE, 0, gettext ("cannot get program header: %s"),
elf_errmsg (-1));
/* Iterate over the sections. */
bool in_relro = false;
bool in_ro = false;
for (size_t inner = 1; inner < shnum; ++inner)
{
Elf_Scn *scn = elf_getscn (ebl->elf, inner);
/* This should not happen. */
if (unlikely (scn == NULL))
error (EXIT_FAILURE, 0, gettext ("cannot get section: %s"),
elf_errmsg (-1));
/* Get the section header. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (unlikely (shdr == NULL))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header: %s"),
elf_errmsg (-1));
if (shdr->sh_size > 0
/* Compare allocated sections by VMA, unallocated
sections by file offset. */
&& (shdr->sh_flags & SHF_ALLOC
? (shdr->sh_addr >= phdr->p_vaddr
&& (shdr->sh_addr + shdr->sh_size
<= phdr->p_vaddr + phdr->p_memsz))
: (shdr->sh_offset >= phdr->p_offset
&& (shdr->sh_offset + shdr->sh_size
<= phdr->p_offset + phdr->p_filesz))))
{
if (has_relro && !in_relro
&& shdr->sh_addr >= relro_from
&& shdr->sh_addr + shdr->sh_size <= relro_to)
{
fputs_unlocked (" [RELRO:", stdout);
in_relro = true;
}
else if (has_relro && in_relro && shdr->sh_addr >= relro_to)
{
fputs_unlocked ("]", stdout);
in_relro = false;
}
else if (has_relro && in_relro
&& shdr->sh_addr + shdr->sh_size > relro_to)
fputs_unlocked ("] <RELRO:", stdout);
else if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_W) == 0)
{
if (!in_ro)
{
fputs_unlocked (" [RO:", stdout);
in_ro = true;
}
}
else
{
/* Determine the segment this section is part of. */
size_t cnt2;
GElf_Phdr phdr2_mem;
GElf_Phdr *phdr2 = NULL;
for (cnt2 = 0; cnt2 < phnum; ++cnt2)
{
phdr2 = gelf_getphdr (ebl->elf, cnt2, &phdr2_mem);
if (phdr2 != NULL && phdr2->p_type == PT_LOAD
&& shdr->sh_addr >= phdr2->p_vaddr
&& (shdr->sh_addr + shdr->sh_size
<= phdr2->p_vaddr + phdr2->p_memsz))
break;
}
if (cnt2 < phnum)
{
if ((phdr2->p_flags & PF_W) == 0 && !in_ro)
{
fputs_unlocked (" [RO:", stdout);
in_ro = true;
}
else if ((phdr2->p_flags & PF_W) != 0 && in_ro)
{
fputs_unlocked ("]", stdout);
in_ro = false;
}
}
}
printf (" %s",
elf_strptr (ebl->elf, shstrndx, shdr->sh_name));
/* Signal that this sectin is only partially covered. */
if (has_relro && in_relro
&& shdr->sh_addr + shdr->sh_size > relro_to)
{
fputs_unlocked (">", stdout);
in_relro = false;
}
}
}
if (in_relro || in_ro)
fputs_unlocked ("]", stdout);
/* Finish the line. */
fputc_unlocked ('\n', stdout);
}
}
static const char *
section_name (Ebl *ebl, GElf_Ehdr *ehdr, GElf_Shdr *shdr)
{
return elf_strptr (ebl->elf, ehdr->e_shstrndx, shdr->sh_name) ?: "???";
}
static void
handle_scngrp (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link);
GElf_Shdr symshdr_mem;
GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem);
Elf_Data *symdata = elf_getdata (symscn, NULL);
if (data == NULL || data->d_size < sizeof (Elf32_Word) || symshdr == NULL
|| symdata == NULL)
return;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
Elf32_Word *grpref = (Elf32_Word *) data->d_buf;
GElf_Sym sym_mem;
GElf_Sym *sym = gelf_getsym (symdata, shdr->sh_info, &sym_mem);
printf ((grpref[0] & GRP_COMDAT)
? ngettext ("\
\nCOMDAT section group [%2zu] '%s' with signature '%s' contains %zu entry:\n",
"\
\nCOMDAT section group [%2zu] '%s' with signature '%s' contains %zu entries:\n",
data->d_size / sizeof (Elf32_Word) - 1)
: ngettext ("\
\nSection group [%2zu] '%s' with signature '%s' contains %zu entry:\n", "\
\nSection group [%2zu] '%s' with signature '%s' contains %zu entries:\n",
data->d_size / sizeof (Elf32_Word) - 1),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
(sym == NULL ? NULL
: elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name))
?: gettext ("<INVALID SYMBOL>"),
data->d_size / sizeof (Elf32_Word) - 1);
for (size_t cnt = 1; cnt < data->d_size / sizeof (Elf32_Word); ++cnt)
{
GElf_Shdr grpshdr_mem;
GElf_Shdr *grpshdr = gelf_getshdr (elf_getscn (ebl->elf, grpref[cnt]),
&grpshdr_mem);
const char *str;
printf (" [%2u] %s\n",
grpref[cnt],
grpshdr != NULL
&& (str = elf_strptr (ebl->elf, shstrndx, grpshdr->sh_name))
? str : gettext ("<INVALID SECTION>"));
}
}
static void
print_scngrp (Ebl *ebl)
{
/* Find all relocation sections and handle them. */
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
/* Handle the section if it is a symbol table. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr != NULL && shdr->sh_type == SHT_GROUP)
{
if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
{
if (elf_compress (scn, 0, 0) < 0)
printf ("WARNING: %s [%zd]\n",
gettext ("Couldn't uncompress section"),
elf_ndxscn (scn));
shdr = gelf_getshdr (scn, &shdr_mem);
}
handle_scngrp (ebl, scn, shdr);
}
}
}
static const struct flags
{
int mask;
const char *str;
} dt_flags[] =
{
{ DF_ORIGIN, "ORIGIN" },
{ DF_SYMBOLIC, "SYMBOLIC" },
{ DF_TEXTREL, "TEXTREL" },
{ DF_BIND_NOW, "BIND_NOW" },
{ DF_STATIC_TLS, "STATIC_TLS" }
};
static const int ndt_flags = sizeof (dt_flags) / sizeof (dt_flags[0]);
static const struct flags dt_flags_1[] =
{
{ DF_1_NOW, "NOW" },
{ DF_1_GLOBAL, "GLOBAL" },
{ DF_1_GROUP, "GROUP" },
{ DF_1_NODELETE, "NODELETE" },
{ DF_1_LOADFLTR, "LOADFLTR" },
{ DF_1_INITFIRST, "INITFIRST" },
{ DF_1_NOOPEN, "NOOPEN" },
{ DF_1_ORIGIN, "ORIGIN" },
{ DF_1_DIRECT, "DIRECT" },
{ DF_1_TRANS, "TRANS" },
{ DF_1_INTERPOSE, "INTERPOSE" },
{ DF_1_NODEFLIB, "NODEFLIB" },
{ DF_1_NODUMP, "NODUMP" },
{ DF_1_CONFALT, "CONFALT" },
{ DF_1_ENDFILTEE, "ENDFILTEE" },
{ DF_1_DISPRELDNE, "DISPRELDNE" },
{ DF_1_DISPRELPND, "DISPRELPND" },
};
static const int ndt_flags_1 = sizeof (dt_flags_1) / sizeof (dt_flags_1[0]);
static const struct flags dt_feature_1[] =
{
{ DTF_1_PARINIT, "PARINIT" },
{ DTF_1_CONFEXP, "CONFEXP" }
};
static const int ndt_feature_1 = (sizeof (dt_feature_1)
/ sizeof (dt_feature_1[0]));
static const struct flags dt_posflag_1[] =
{
{ DF_P1_LAZYLOAD, "LAZYLOAD" },
{ DF_P1_GROUPPERM, "GROUPPERM" }
};
static const int ndt_posflag_1 = (sizeof (dt_posflag_1)
/ sizeof (dt_posflag_1[0]));
static void
print_flags (int class, GElf_Xword d_val, const struct flags *flags,
int nflags)
{
bool first = true;
int cnt;
for (cnt = 0; cnt < nflags; ++cnt)
if (d_val & flags[cnt].mask)
{
if (!first)
putchar_unlocked (' ');
fputs_unlocked (flags[cnt].str, stdout);
d_val &= ~flags[cnt].mask;
first = false;
}
if (d_val != 0)
{
if (!first)
putchar_unlocked (' ');
printf ("%#0*" PRIx64, class == ELFCLASS32 ? 10 : 18, d_val);
}
putchar_unlocked ('\n');
}
static void
print_dt_flags (int class, GElf_Xword d_val)
{
print_flags (class, d_val, dt_flags, ndt_flags);
}
static void
print_dt_flags_1 (int class, GElf_Xword d_val)
{
print_flags (class, d_val, dt_flags_1, ndt_flags_1);
}
static void
print_dt_feature_1 (int class, GElf_Xword d_val)
{
print_flags (class, d_val, dt_feature_1, ndt_feature_1);
}
static void
print_dt_posflag_1 (int class, GElf_Xword d_val)
{
print_flags (class, d_val, dt_posflag_1, ndt_posflag_1);
}
static void
handle_dynamic (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
int class = gelf_getclass (ebl->elf);
GElf_Shdr glink_mem;
GElf_Shdr *glink;
Elf_Data *data;
size_t cnt;
size_t shstrndx;
size_t sh_entsize;
/* Get the data of the section. */
data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Get the section header string table index. */
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
sh_entsize = gelf_fsize (ebl->elf, ELF_T_DYN, 1, EV_CURRENT);
glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem);
if (glink == NULL)
error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
printf (ngettext ("\
\nDynamic segment contains %lu entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
\nDynamic segment contains %lu entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
shdr->sh_size / sh_entsize),
(unsigned long int) (shdr->sh_size / sh_entsize),
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(int) shdr->sh_link,
elf_strptr (ebl->elf, shstrndx, glink->sh_name));
fputs_unlocked (gettext (" Type Value\n"), stdout);
for (cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt)
{
GElf_Dyn dynmem;
GElf_Dyn *dyn = gelf_getdyn (data, cnt, &dynmem);
if (dyn == NULL)
break;
char buf[64];
printf (" %-17s ",
ebl_dynamic_tag_name (ebl, dyn->d_tag, buf, sizeof (buf)));
switch (dyn->d_tag)
{
case DT_NULL:
case DT_DEBUG:
case DT_BIND_NOW:
case DT_TEXTREL:
/* No further output. */
fputc_unlocked ('\n', stdout);
break;
case DT_NEEDED:
printf (gettext ("Shared library: [%s]\n"),
elf_strptr (ebl->elf, shdr->sh_link, dyn->d_un.d_val));
break;
case DT_SONAME:
printf (gettext ("Library soname: [%s]\n"),
elf_strptr (ebl->elf, shdr->sh_link, dyn->d_un.d_val));
break;
case DT_RPATH:
printf (gettext ("Library rpath: [%s]\n"),
elf_strptr (ebl->elf, shdr->sh_link, dyn->d_un.d_val));
break;
case DT_RUNPATH:
printf (gettext ("Library runpath: [%s]\n"),
elf_strptr (ebl->elf, shdr->sh_link, dyn->d_un.d_val));
break;
case DT_PLTRELSZ:
case DT_RELASZ:
case DT_STRSZ:
case DT_RELSZ:
case DT_RELAENT:
case DT_SYMENT:
case DT_RELENT:
case DT_PLTPADSZ:
case DT_MOVEENT:
case DT_MOVESZ:
case DT_INIT_ARRAYSZ:
case DT_FINI_ARRAYSZ:
case DT_SYMINSZ:
case DT_SYMINENT:
case DT_GNU_CONFLICTSZ:
case DT_GNU_LIBLISTSZ:
printf (gettext ("%" PRId64 " (bytes)\n"), dyn->d_un.d_val);
break;
case DT_VERDEFNUM:
case DT_VERNEEDNUM:
case DT_RELACOUNT:
case DT_RELCOUNT:
printf ("%" PRId64 "\n", dyn->d_un.d_val);
break;
case DT_PLTREL:;
const char *tagname = ebl_dynamic_tag_name (ebl, dyn->d_un.d_val,
NULL, 0);
puts (tagname ?: "???");
break;
case DT_FLAGS:
print_dt_flags (class, dyn->d_un.d_val);
break;
case DT_FLAGS_1:
print_dt_flags_1 (class, dyn->d_un.d_val);
break;
case DT_FEATURE_1:
print_dt_feature_1 (class, dyn->d_un.d_val);
break;
case DT_POSFLAG_1:
print_dt_posflag_1 (class, dyn->d_un.d_val);
break;
default:
printf ("%#0*" PRIx64 "\n",
class == ELFCLASS32 ? 10 : 18, dyn->d_un.d_val);
break;
}
}
}
/* Print the dynamic segment. */
static void
print_dynamic (Ebl *ebl)
{
for (size_t i = 0; i < phnum; ++i)
{
GElf_Phdr phdr_mem;
GElf_Phdr *phdr = gelf_getphdr (ebl->elf, i, &phdr_mem);
if (phdr != NULL && phdr->p_type == PT_DYNAMIC)
{
Elf_Scn *scn = gelf_offscn (ebl->elf, phdr->p_offset);
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr != NULL && shdr->sh_type == SHT_DYNAMIC)
handle_dynamic (ebl, scn, shdr);
break;
}
}
}
/* Print relocations. */
static void
print_relocs (Ebl *ebl, GElf_Ehdr *ehdr)
{
/* Find all relocation sections and handle them. */
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
/* Handle the section if it is a symbol table. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (likely (shdr != NULL))
{
if (shdr->sh_type == SHT_REL)
handle_relocs_rel (ebl, ehdr, scn, shdr);
else if (shdr->sh_type == SHT_RELA)
handle_relocs_rela (ebl, ehdr, scn, shdr);
}
}
}
/* Handle a relocation section. */
static void
handle_relocs_rel (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr)
{
int class = gelf_getclass (ebl->elf);
size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_REL, 1, EV_CURRENT);
int nentries = shdr->sh_size / sh_entsize;
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Get the symbol table information. */
Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link);
GElf_Shdr symshdr_mem;
GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem);
Elf_Data *symdata = elf_getdata (symscn, NULL);
/* Get the section header of the section the relocations are for. */
GElf_Shdr destshdr_mem;
GElf_Shdr *destshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_info),
&destshdr_mem);
if (unlikely (symshdr == NULL || symdata == NULL || destshdr == NULL))
{
printf (gettext ("\nInvalid symbol table at offset %#0" PRIx64 "\n"),
shdr->sh_offset);
return;
}
/* Search for the optional extended section index table. */
Elf_Data *xndxdata = NULL;
int xndxscnidx = elf_scnshndx (scn);
if (unlikely (xndxscnidx > 0))
xndxdata = elf_getdata (elf_getscn (ebl->elf, xndxscnidx), NULL);
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
if (shdr->sh_info != 0)
printf (ngettext ("\
\nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n",
"\
\nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n",
nentries),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
(unsigned int) shdr->sh_info,
elf_strptr (ebl->elf, shstrndx, destshdr->sh_name),
shdr->sh_offset,
nentries);
else
/* The .rel.dyn section does not refer to a specific section but
instead of section index zero. Do not try to print a section
name. */
printf (ngettext ("\
\nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n",
"\
\nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n",
nentries),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
shdr->sh_offset,
nentries);
fputs_unlocked (class == ELFCLASS32
? gettext ("\
Offset Type Value Name\n")
: gettext ("\
Offset Type Value Name\n"),
stdout);
int is_statically_linked = 0;
for (int cnt = 0; cnt < nentries; ++cnt)
{
GElf_Rel relmem;
GElf_Rel *rel = gelf_getrel (data, cnt, &relmem);
if (likely (rel != NULL))
{
char buf[128];
GElf_Sym symmem;
Elf32_Word xndx;
GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata,
GELF_R_SYM (rel->r_info),
&symmem, &xndx);
if (unlikely (sym == NULL))
{
/* As a special case we have to handle relocations in static
executables. This only happens for IRELATIVE relocations
(so far). There is no symbol table. */
if (is_statically_linked == 0)
{
/* Find the program header and look for a PT_INTERP entry. */
is_statically_linked = -1;
if (ehdr->e_type == ET_EXEC)
{
is_statically_linked = 1;
for (size_t inner = 0; inner < phnum; ++inner)
{
GElf_Phdr phdr_mem;
GElf_Phdr *phdr = gelf_getphdr (ebl->elf, inner,
&phdr_mem);
if (phdr != NULL && phdr->p_type == PT_INTERP)
{
is_statically_linked = -1;
break;
}
}
}
}
if (is_statically_linked > 0 && shdr->sh_link == 0)
printf ("\
%#0*" PRIx64 " %-20s %*s %s\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
class == ELFCLASS32 ? 10 : 18, "",
elf_strptr (ebl->elf, shstrndx, destshdr->sh_name));
else
printf (" %#0*" PRIx64 " %-20s <%s %ld>\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
gettext ("INVALID SYMBOL"),
(long int) GELF_R_SYM (rel->r_info));
}
else if (GELF_ST_TYPE (sym->st_info) != STT_SECTION)
printf (" %#0*" PRIx64 " %-20s %#0*" PRIx64 " %s\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
likely (ebl_reloc_type_check (ebl,
GELF_R_TYPE (rel->r_info)))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
class == ELFCLASS32 ? 10 : 18, sym->st_value,
elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name));
else
{
/* This is a relocation against a STT_SECTION symbol. */
GElf_Shdr secshdr_mem;
GElf_Shdr *secshdr;
secshdr = gelf_getshdr (elf_getscn (ebl->elf,
sym->st_shndx == SHN_XINDEX
? xndx : sym->st_shndx),
&secshdr_mem);
if (unlikely (secshdr == NULL))
printf (" %#0*" PRIx64 " %-20s <%s %ld>\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
gettext ("INVALID SECTION"),
(long int) (sym->st_shndx == SHN_XINDEX
? xndx : sym->st_shndx));
else
printf (" %#0*" PRIx64 " %-20s %#0*" PRIx64 " %s\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
class == ELFCLASS32 ? 10 : 18, sym->st_value,
elf_strptr (ebl->elf, shstrndx, secshdr->sh_name));
}
}
}
}
/* Handle a relocation section. */
static void
handle_relocs_rela (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn, GElf_Shdr *shdr)
{
int class = gelf_getclass (ebl->elf);
size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_RELA, 1, EV_CURRENT);
int nentries = shdr->sh_size / sh_entsize;
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Get the symbol table information. */
Elf_Scn *symscn = elf_getscn (ebl->elf, shdr->sh_link);
GElf_Shdr symshdr_mem;
GElf_Shdr *symshdr = gelf_getshdr (symscn, &symshdr_mem);
Elf_Data *symdata = elf_getdata (symscn, NULL);
/* Get the section header of the section the relocations are for. */
GElf_Shdr destshdr_mem;
GElf_Shdr *destshdr = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_info),
&destshdr_mem);
if (unlikely (symshdr == NULL || symdata == NULL || destshdr == NULL))
{
printf (gettext ("\nInvalid symbol table at offset %#0" PRIx64 "\n"),
shdr->sh_offset);
return;
}
/* Search for the optional extended section index table. */
Elf_Data *xndxdata = NULL;
int xndxscnidx = elf_scnshndx (scn);
if (unlikely (xndxscnidx > 0))
xndxdata = elf_getdata (elf_getscn (ebl->elf, xndxscnidx), NULL);
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
if (shdr->sh_info != 0)
printf (ngettext ("\
\nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n",
"\
\nRelocation section [%2zu] '%s' for section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n",
nentries),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
(unsigned int) shdr->sh_info,
elf_strptr (ebl->elf, shstrndx, destshdr->sh_name),
shdr->sh_offset,
nentries);
else
/* The .rela.dyn section does not refer to a specific section but
instead of section index zero. Do not try to print a section
name. */
printf (ngettext ("\
\nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entry:\n",
"\
\nRelocation section [%2u] '%s' at offset %#0" PRIx64 " contains %d entries:\n",
nentries),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
shdr->sh_offset,
nentries);
fputs_unlocked (class == ELFCLASS32
? gettext ("\
Offset Type Value Addend Name\n")
: gettext ("\
Offset Type Value Addend Name\n"),
stdout);
int is_statically_linked = 0;
for (int cnt = 0; cnt < nentries; ++cnt)
{
GElf_Rela relmem;
GElf_Rela *rel = gelf_getrela (data, cnt, &relmem);
if (likely (rel != NULL))
{
char buf[64];
GElf_Sym symmem;
Elf32_Word xndx;
GElf_Sym *sym = gelf_getsymshndx (symdata, xndxdata,
GELF_R_SYM (rel->r_info),
&symmem, &xndx);
if (unlikely (sym == NULL))
{
/* As a special case we have to handle relocations in static
executables. This only happens for IRELATIVE relocations
(so far). There is no symbol table. */
if (is_statically_linked == 0)
{
/* Find the program header and look for a PT_INTERP entry. */
is_statically_linked = -1;
if (ehdr->e_type == ET_EXEC)
{
is_statically_linked = 1;
for (size_t inner = 0; inner < phnum; ++inner)
{
GElf_Phdr phdr_mem;
GElf_Phdr *phdr = gelf_getphdr (ebl->elf, inner,
&phdr_mem);
if (phdr != NULL && phdr->p_type == PT_INTERP)
{
is_statically_linked = -1;
break;
}
}
}
}
if (is_statically_linked > 0 && shdr->sh_link == 0)
printf ("\
%#0*" PRIx64 " %-15s %*s %#6" PRIx64 " %s\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
class == ELFCLASS32 ? 10 : 18, "",
rel->r_addend,
elf_strptr (ebl->elf, shstrndx, destshdr->sh_name));
else
printf (" %#0*" PRIx64 " %-15s <%s %ld>\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
gettext ("INVALID SYMBOL"),
(long int) GELF_R_SYM (rel->r_info));
}
else if (GELF_ST_TYPE (sym->st_info) != STT_SECTION)
printf ("\
%#0*" PRIx64 " %-15s %#0*" PRIx64 " %+6" PRId64 " %s\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
likely (ebl_reloc_type_check (ebl,
GELF_R_TYPE (rel->r_info)))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
class == ELFCLASS32 ? 10 : 18, sym->st_value,
rel->r_addend,
elf_strptr (ebl->elf, symshdr->sh_link, sym->st_name));
else
{
/* This is a relocation against a STT_SECTION symbol. */
GElf_Shdr secshdr_mem;
GElf_Shdr *secshdr;
secshdr = gelf_getshdr (elf_getscn (ebl->elf,
sym->st_shndx == SHN_XINDEX
? xndx : sym->st_shndx),
&secshdr_mem);
if (unlikely (secshdr == NULL))
printf (" %#0*" PRIx64 " %-15s <%s %ld>\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
gettext ("INVALID SECTION"),
(long int) (sym->st_shndx == SHN_XINDEX
? xndx : sym->st_shndx));
else
printf ("\
%#0*" PRIx64 " %-15s %#0*" PRIx64 " %+6" PRId64 " %s\n",
class == ELFCLASS32 ? 10 : 18, rel->r_offset,
ebl_reloc_type_check (ebl, GELF_R_TYPE (rel->r_info))
/* Avoid the leading R_ which isn't carrying any
information. */
? ebl_reloc_type_name (ebl, GELF_R_TYPE (rel->r_info),
buf, sizeof (buf)) + 2
: gettext ("<INVALID RELOC>"),
class == ELFCLASS32 ? 10 : 18, sym->st_value,
rel->r_addend,
elf_strptr (ebl->elf, shstrndx, secshdr->sh_name));
}
}
}
}
/* Print the program header. */
static void
print_symtab (Ebl *ebl, int type)
{
/* Find the symbol table(s). For this we have to search through the
section table. */
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
/* Handle the section if it is a symbol table. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr != NULL && shdr->sh_type == (GElf_Word) type)
{
if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
{
if (elf_compress (scn, 0, 0) < 0)
printf ("WARNING: %s [%zd]\n",
gettext ("Couldn't uncompress section"),
elf_ndxscn (scn));
shdr = gelf_getshdr (scn, &shdr_mem);
}
handle_symtab (ebl, scn, shdr);
}
}
}
static void
handle_symtab (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
Elf_Data *versym_data = NULL;
Elf_Data *verneed_data = NULL;
Elf_Data *verdef_data = NULL;
Elf_Data *xndx_data = NULL;
int class = gelf_getclass (ebl->elf);
Elf32_Word verneed_stridx = 0;
Elf32_Word verdef_stridx = 0;
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Find out whether we have other sections we might need. */
Elf_Scn *runscn = NULL;
while ((runscn = elf_nextscn (ebl->elf, runscn)) != NULL)
{
GElf_Shdr runshdr_mem;
GElf_Shdr *runshdr = gelf_getshdr (runscn, &runshdr_mem);
if (likely (runshdr != NULL))
{
if (runshdr->sh_type == SHT_GNU_versym
&& runshdr->sh_link == elf_ndxscn (scn))
/* Bingo, found the version information. Now get the data. */
versym_data = elf_getdata (runscn, NULL);
else if (runshdr->sh_type == SHT_GNU_verneed)
{
/* This is the information about the needed versions. */
verneed_data = elf_getdata (runscn, NULL);
verneed_stridx = runshdr->sh_link;
}
else if (runshdr->sh_type == SHT_GNU_verdef)
{
/* This is the information about the defined versions. */
verdef_data = elf_getdata (runscn, NULL);
verdef_stridx = runshdr->sh_link;
}
else if (runshdr->sh_type == SHT_SYMTAB_SHNDX
&& runshdr->sh_link == elf_ndxscn (scn))
/* Extended section index. */
xndx_data = elf_getdata (runscn, NULL);
}
}
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
GElf_Shdr glink_mem;
GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
&glink_mem);
if (glink == NULL)
error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
/* Now we can compute the number of entries in the section. */
unsigned int nsyms = data->d_size / (class == ELFCLASS32
? sizeof (Elf32_Sym)
: sizeof (Elf64_Sym));
printf (ngettext ("\nSymbol table [%2u] '%s' contains %u entry:\n",
"\nSymbol table [%2u] '%s' contains %u entries:\n",
nsyms),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name), nsyms);
printf (ngettext (" %lu local symbol String table: [%2u] '%s'\n",
" %lu local symbols String table: [%2u] '%s'\n",
shdr->sh_info),
(unsigned long int) shdr->sh_info,
(unsigned int) shdr->sh_link,
elf_strptr (ebl->elf, shstrndx, glink->sh_name));
fputs_unlocked (class == ELFCLASS32
? gettext ("\
Num: Value Size Type Bind Vis Ndx Name\n")
: gettext ("\
Num: Value Size Type Bind Vis Ndx Name\n"),
stdout);
for (unsigned int cnt = 0; cnt < nsyms; ++cnt)
{
char typebuf[64];
char bindbuf[64];
char scnbuf[64];
Elf32_Word xndx;
GElf_Sym sym_mem;
GElf_Sym *sym = gelf_getsymshndx (data, xndx_data, cnt, &sym_mem, &xndx);
if (unlikely (sym == NULL))
continue;
/* Determine the real section index. */
if (likely (sym->st_shndx != SHN_XINDEX))
xndx = sym->st_shndx;
printf (gettext ("\
%5u: %0*" PRIx64 " %6" PRId64 " %-7s %-6s %-9s %6s %s"),
cnt,
class == ELFCLASS32 ? 8 : 16,
sym->st_value,
sym->st_size,
ebl_symbol_type_name (ebl, GELF_ST_TYPE (sym->st_info),
typebuf, sizeof (typebuf)),
ebl_symbol_binding_name (ebl, GELF_ST_BIND (sym->st_info),
bindbuf, sizeof (bindbuf)),
get_visibility_type (GELF_ST_VISIBILITY (sym->st_other)),
ebl_section_name (ebl, sym->st_shndx, xndx, scnbuf,
sizeof (scnbuf), NULL, shnum),
elf_strptr (ebl->elf, shdr->sh_link, sym->st_name));
if (versym_data != NULL)
{
/* Get the version information. */
GElf_Versym versym_mem;
GElf_Versym *versym = gelf_getversym (versym_data, cnt, &versym_mem);
if (versym != NULL && ((*versym & 0x8000) != 0 || *versym > 1))
{
bool is_nobits = false;
bool check_def = xndx != SHN_UNDEF;
if (xndx < SHN_LORESERVE || sym->st_shndx == SHN_XINDEX)
{
GElf_Shdr symshdr_mem;
GElf_Shdr *symshdr =
gelf_getshdr (elf_getscn (ebl->elf, xndx), &symshdr_mem);
is_nobits = (symshdr != NULL
&& symshdr->sh_type == SHT_NOBITS);
}
if (is_nobits || ! check_def)
{
/* We must test both. */
GElf_Vernaux vernaux_mem;
GElf_Vernaux *vernaux = NULL;
size_t vn_offset = 0;
GElf_Verneed verneed_mem;
GElf_Verneed *verneed = gelf_getverneed (verneed_data, 0,
&verneed_mem);
while (verneed != NULL)
{
size_t vna_offset = vn_offset;
vernaux = gelf_getvernaux (verneed_data,
vna_offset += verneed->vn_aux,
&vernaux_mem);
while (vernaux != NULL
&& vernaux->vna_other != *versym
&& vernaux->vna_next != 0)
{
/* Update the offset. */
vna_offset += vernaux->vna_next;
vernaux = (vernaux->vna_next == 0
? NULL
: gelf_getvernaux (verneed_data,
vna_offset,
&vernaux_mem));
}
/* Check whether we found the version. */
if (vernaux != NULL && vernaux->vna_other == *versym)
/* Found it. */
break;
vn_offset += verneed->vn_next;
verneed = (verneed->vn_next == 0
? NULL
: gelf_getverneed (verneed_data, vn_offset,
&verneed_mem));
}
if (vernaux != NULL && vernaux->vna_other == *versym)
{
printf ("@%s (%u)",
elf_strptr (ebl->elf, verneed_stridx,
vernaux->vna_name),
(unsigned int) vernaux->vna_other);
check_def = 0;
}
else if (unlikely (! is_nobits))
error (0, 0, gettext ("bad dynamic symbol"));
else
check_def = 1;
}
if (check_def && *versym != 0x8001)
{
/* We must test both. */
size_t vd_offset = 0;
GElf_Verdef verdef_mem;
GElf_Verdef *verdef = gelf_getverdef (verdef_data, 0,
&verdef_mem);
while (verdef != NULL)
{
if (verdef->vd_ndx == (*versym & 0x7fff))
/* Found the definition. */
break;
vd_offset += verdef->vd_next;
verdef = (verdef->vd_next == 0
? NULL
: gelf_getverdef (verdef_data, vd_offset,
&verdef_mem));
}
if (verdef != NULL)
{
GElf_Verdaux verdaux_mem;
GElf_Verdaux *verdaux
= gelf_getverdaux (verdef_data,
vd_offset + verdef->vd_aux,
&verdaux_mem);
if (verdaux != NULL)
printf ((*versym & 0x8000) ? "@%s" : "@@%s",
elf_strptr (ebl->elf, verdef_stridx,
verdaux->vda_name));
}
}
}
}
putchar_unlocked ('\n');
}
}
/* Print version information. */
static void
print_verinfo (Ebl *ebl)
{
/* Find the version information sections. For this we have to
search through the section table. */
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
/* Handle the section if it is part of the versioning handling. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (likely (shdr != NULL))
{
if (shdr->sh_type == SHT_GNU_verneed)
handle_verneed (ebl, scn, shdr);
else if (shdr->sh_type == SHT_GNU_verdef)
handle_verdef (ebl, scn, shdr);
else if (shdr->sh_type == SHT_GNU_versym)
handle_versym (ebl, scn, shdr);
}
}
}
static const char *
get_ver_flags (unsigned int flags)
{
static char buf[32];
char *endp;
if (flags == 0)
return gettext ("none");
if (flags & VER_FLG_BASE)
endp = stpcpy (buf, "BASE ");
else
endp = buf;
if (flags & VER_FLG_WEAK)
{
if (endp != buf)
endp = stpcpy (endp, "| ");
endp = stpcpy (endp, "WEAK ");
}
if (unlikely (flags & ~(VER_FLG_BASE | VER_FLG_WEAK)))
{
strncpy (endp, gettext ("| <unknown>"), buf + sizeof (buf) - endp);
buf[sizeof (buf) - 1] = '\0';
}
return buf;
}
static void
handle_verneed (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
int class = gelf_getclass (ebl->elf);
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
GElf_Shdr glink_mem;
GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
&glink_mem);
if (glink == NULL)
error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
printf (ngettext ("\
\nVersion needs section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
\nVersion needs section [%2u] '%s' contains %d entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
shdr->sh_info),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name), shdr->sh_info,
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
elf_strptr (ebl->elf, shstrndx, glink->sh_name));
unsigned int offset = 0;
for (int cnt = shdr->sh_info; --cnt >= 0; )
{
/* Get the data at the next offset. */
GElf_Verneed needmem;
GElf_Verneed *need = gelf_getverneed (data, offset, &needmem);
if (unlikely (need == NULL))
break;
printf (gettext (" %#06x: Version: %hu File: %s Cnt: %hu\n"),
offset, (unsigned short int) need->vn_version,
elf_strptr (ebl->elf, shdr->sh_link, need->vn_file),
(unsigned short int) need->vn_cnt);
unsigned int auxoffset = offset + need->vn_aux;
for (int cnt2 = need->vn_cnt; --cnt2 >= 0; )
{
GElf_Vernaux auxmem;
GElf_Vernaux *aux = gelf_getvernaux (data, auxoffset, &auxmem);
if (unlikely (aux == NULL))
break;
printf (gettext (" %#06x: Name: %s Flags: %s Version: %hu\n"),
auxoffset,
elf_strptr (ebl->elf, shdr->sh_link, aux->vna_name),
get_ver_flags (aux->vna_flags),
(unsigned short int) aux->vna_other);
if (aux->vna_next == 0)
break;
auxoffset += aux->vna_next;
}
/* Find the next offset. */
if (need->vn_next == 0)
break;
offset += need->vn_next;
}
}
static void
handle_verdef (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
GElf_Shdr glink_mem;
GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
&glink_mem);
if (glink == NULL)
error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
int class = gelf_getclass (ebl->elf);
printf (ngettext ("\
\nVersion definition section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
\nVersion definition section [%2u] '%s' contains %d entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
shdr->sh_info),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
shdr->sh_info,
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
elf_strptr (ebl->elf, shstrndx, glink->sh_name));
unsigned int offset = 0;
for (int cnt = shdr->sh_info; --cnt >= 0; )
{
/* Get the data at the next offset. */
GElf_Verdef defmem;
GElf_Verdef *def = gelf_getverdef (data, offset, &defmem);
if (unlikely (def == NULL))
break;
unsigned int auxoffset = offset + def->vd_aux;
GElf_Verdaux auxmem;
GElf_Verdaux *aux = gelf_getverdaux (data, auxoffset, &auxmem);
if (unlikely (aux == NULL))
break;
printf (gettext ("\
%#06x: Version: %hd Flags: %s Index: %hd Cnt: %hd Name: %s\n"),
offset, def->vd_version,
get_ver_flags (def->vd_flags),
def->vd_ndx,
def->vd_cnt,
elf_strptr (ebl->elf, shdr->sh_link, aux->vda_name));
auxoffset += aux->vda_next;
for (int cnt2 = 1; cnt2 < def->vd_cnt; ++cnt2)
{
aux = gelf_getverdaux (data, auxoffset, &auxmem);
if (unlikely (aux == NULL))
break;
printf (gettext (" %#06x: Parent %d: %s\n"),
auxoffset, cnt2,
elf_strptr (ebl->elf, shdr->sh_link, aux->vda_name));
if (aux->vda_next == 0)
break;
auxoffset += aux->vda_next;
}
/* Find the next offset. */
if (def->vd_next == 0)
break;
offset += def->vd_next;
}
}
static void
handle_versym (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr)
{
int class = gelf_getclass (ebl->elf);
const char **vername;
const char **filename;
/* Get the data of the section. */
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
/* We have to find the version definition section and extract the
version names. */
Elf_Scn *defscn = NULL;
Elf_Scn *needscn = NULL;
Elf_Scn *verscn = NULL;
while ((verscn = elf_nextscn (ebl->elf, verscn)) != NULL)
{
GElf_Shdr vershdr_mem;
GElf_Shdr *vershdr = gelf_getshdr (verscn, &vershdr_mem);
if (likely (vershdr != NULL))
{
if (vershdr->sh_type == SHT_GNU_verdef)
defscn = verscn;
else if (vershdr->sh_type == SHT_GNU_verneed)
needscn = verscn;
}
}
size_t nvername;
if (defscn != NULL || needscn != NULL)
{
/* We have a version information (better should have). Now get
the version names. First find the maximum version number. */
nvername = 0;
if (defscn != NULL)
{
/* Run through the version definitions and find the highest
index. */
unsigned int offset = 0;
Elf_Data *defdata;
GElf_Shdr defshdrmem;
GElf_Shdr *defshdr;
defdata = elf_getdata (defscn, NULL);
if (unlikely (defdata == NULL))
return;
defshdr = gelf_getshdr (defscn, &defshdrmem);
if (unlikely (defshdr == NULL))
return;
for (unsigned int cnt = 0; cnt < defshdr->sh_info; ++cnt)
{
GElf_Verdef defmem;
GElf_Verdef *def;
/* Get the data at the next offset. */
def = gelf_getverdef (defdata, offset, &defmem);
if (unlikely (def == NULL))
break;
nvername = MAX (nvername, (size_t) (def->vd_ndx & 0x7fff));
if (def->vd_next == 0)
break;
offset += def->vd_next;
}
}
if (needscn != NULL)
{
unsigned int offset = 0;
Elf_Data *needdata;
GElf_Shdr needshdrmem;
GElf_Shdr *needshdr;
needdata = elf_getdata (needscn, NULL);
if (unlikely (needdata == NULL))
return;
needshdr = gelf_getshdr (needscn, &needshdrmem);
if (unlikely (needshdr == NULL))
return;
for (unsigned int cnt = 0; cnt < needshdr->sh_info; ++cnt)
{
GElf_Verneed needmem;
GElf_Verneed *need;
unsigned int auxoffset;
int cnt2;
/* Get the data at the next offset. */
need = gelf_getverneed (needdata, offset, &needmem);
if (unlikely (need == NULL))
break;
/* Run through the auxiliary entries. */
auxoffset = offset + need->vn_aux;
for (cnt2 = need->vn_cnt; --cnt2 >= 0; )
{
GElf_Vernaux auxmem;
GElf_Vernaux *aux;
aux = gelf_getvernaux (needdata, auxoffset, &auxmem);
if (unlikely (aux == NULL))
break;
nvername = MAX (nvername,
(size_t) (aux->vna_other & 0x7fff));
if (aux->vna_next == 0)
break;
auxoffset += aux->vna_next;
}
if (need->vn_next == 0)
break;
offset += need->vn_next;
}
}
/* This is the number of versions we know about. */
++nvername;
/* Allocate the array. */
vername = (const char **) alloca (nvername * sizeof (const char *));
memset(vername, 0, nvername * sizeof (const char *));
filename = (const char **) alloca (nvername * sizeof (const char *));
memset(filename, 0, nvername * sizeof (const char *));
/* Run through the data structures again and collect the strings. */
if (defscn != NULL)
{
/* Run through the version definitions and find the highest
index. */
unsigned int offset = 0;
Elf_Data *defdata;
GElf_Shdr defshdrmem;
GElf_Shdr *defshdr;
defdata = elf_getdata (defscn, NULL);
if (unlikely (defdata == NULL))
return;
defshdr = gelf_getshdr (defscn, &defshdrmem);
if (unlikely (defshdr == NULL))
return;
for (unsigned int cnt = 0; cnt < defshdr->sh_info; ++cnt)
{
/* Get the data at the next offset. */
GElf_Verdef defmem;
GElf_Verdef *def = gelf_getverdef (defdata, offset, &defmem);
if (unlikely (def == NULL))
break;
GElf_Verdaux auxmem;
GElf_Verdaux *aux = gelf_getverdaux (defdata,
offset + def->vd_aux,
&auxmem);
if (unlikely (aux == NULL))
break;
vername[def->vd_ndx & 0x7fff]
= elf_strptr (ebl->elf, defshdr->sh_link, aux->vda_name);
filename[def->vd_ndx & 0x7fff] = NULL;
if (def->vd_next == 0)
break;
offset += def->vd_next;
}
}
if (needscn != NULL)
{
unsigned int offset = 0;
Elf_Data *needdata = elf_getdata (needscn, NULL);
GElf_Shdr needshdrmem;
GElf_Shdr *needshdr = gelf_getshdr (needscn, &needshdrmem);
if (unlikely (needdata == NULL || needshdr == NULL))
return;
for (unsigned int cnt = 0; cnt < needshdr->sh_info; ++cnt)
{
/* Get the data at the next offset. */
GElf_Verneed needmem;
GElf_Verneed *need = gelf_getverneed (needdata, offset,
&needmem);
if (unlikely (need == NULL))
break;
/* Run through the auxiliary entries. */
unsigned int auxoffset = offset + need->vn_aux;
for (int cnt2 = need->vn_cnt; --cnt2 >= 0; )
{
GElf_Vernaux auxmem;
GElf_Vernaux *aux = gelf_getvernaux (needdata, auxoffset,
&auxmem);
if (unlikely (aux == NULL))
break;
vername[aux->vna_other & 0x7fff]
= elf_strptr (ebl->elf, needshdr->sh_link, aux->vna_name);
filename[aux->vna_other & 0x7fff]
= elf_strptr (ebl->elf, needshdr->sh_link, need->vn_file);
if (aux->vna_next == 0)
break;
auxoffset += aux->vna_next;
}
if (need->vn_next == 0)
break;
offset += need->vn_next;
}
}
}
else
{
vername = NULL;
nvername = 1;
filename = NULL;
}
GElf_Shdr glink_mem;
GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link),
&glink_mem);
size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_HALF, 1, EV_CURRENT);
if (glink == NULL)
error (EXIT_FAILURE, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
/* Print the header. */
printf (ngettext ("\
\nVersion symbols section [%2u] '%s' contains %d entry:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'",
"\
\nVersion symbols section [%2u] '%s' contains %d entries:\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'",
shdr->sh_size / sh_entsize),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
(int) (shdr->sh_size / sh_entsize),
class == ELFCLASS32 ? 10 : 18, shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
elf_strptr (ebl->elf, shstrndx, glink->sh_name));
/* Now we can finally look at the actual contents of this section. */
for (unsigned int cnt = 0; cnt < shdr->sh_size / sh_entsize; ++cnt)
{
if (cnt % 2 == 0)
printf ("\n %4d:", cnt);
GElf_Versym symmem;
GElf_Versym *sym = gelf_getversym (data, cnt, &symmem);
if (sym == NULL)
break;
switch (*sym)
{
ssize_t n;
case 0:
fputs_unlocked (gettext (" 0 *local* "),
stdout);
break;
case 1:
fputs_unlocked (gettext (" 1 *global* "),
stdout);
break;
default:
n = printf ("%4d%c%s",
*sym & 0x7fff, *sym & 0x8000 ? 'h' : ' ',
(vername != NULL
&& (unsigned int) (*sym & 0x7fff) < nvername)
? vername[*sym & 0x7fff] : "???");
if ((unsigned int) (*sym & 0x7fff) < nvername
&& filename != NULL && filename[*sym & 0x7fff] != NULL)
n += printf ("(%s)", filename[*sym & 0x7fff]);
printf ("%*s", MAX (0, 33 - (int) n), " ");
break;
}
}
putchar_unlocked ('\n');
}
static void
print_hash_info (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx,
uint_fast32_t maxlength, Elf32_Word nbucket,
uint_fast32_t nsyms, uint32_t *lengths, const char *extrastr)
{
uint32_t *counts = (uint32_t *) xcalloc (maxlength + 1, sizeof (uint32_t));
for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt)
++counts[lengths[cnt]];
GElf_Shdr glink_mem;
GElf_Shdr *glink = gelf_getshdr (elf_getscn (ebl->elf,
shdr->sh_link),
&glink_mem);
if (glink == NULL)
{
error (0, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
return;
}
printf (ngettext ("\
\nHistogram for bucket list length in section [%2u] '%s' (total of %d bucket):\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
"\
\nHistogram for bucket list length in section [%2u] '%s' (total of %d buckets):\n Addr: %#0*" PRIx64 " Offset: %#08" PRIx64 " Link to section: [%2u] '%s'\n",
nbucket),
(unsigned int) elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
(int) nbucket,
gelf_getclass (ebl->elf) == ELFCLASS32 ? 10 : 18,
shdr->sh_addr,
shdr->sh_offset,
(unsigned int) shdr->sh_link,
elf_strptr (ebl->elf, shstrndx, glink->sh_name));
if (extrastr != NULL)
fputs (extrastr, stdout);
if (likely (nbucket > 0))
{
uint64_t success = 0;
/* xgettext:no-c-format */
fputs_unlocked (gettext ("\
Length Number % of total Coverage\n"), stdout);
printf (gettext (" 0 %6" PRIu32 " %5.1f%%\n"),
counts[0], (counts[0] * 100.0) / nbucket);
uint64_t nzero_counts = 0;
for (Elf32_Word cnt = 1; cnt <= maxlength; ++cnt)
{
nzero_counts += counts[cnt] * cnt;
printf (gettext ("\
%7d %6" PRIu32 " %5.1f%% %5.1f%%\n"),
(int) cnt, counts[cnt], (counts[cnt] * 100.0) / nbucket,
(nzero_counts * 100.0) / nsyms);
}
Elf32_Word acc = 0;
for (Elf32_Word cnt = 1; cnt <= maxlength; ++cnt)
{
acc += cnt;
success += counts[cnt] * acc;
}
printf (gettext ("\
Average number of tests: successful lookup: %f\n\
unsuccessful lookup: %f\n"),
(double) success / (double) nzero_counts,
(double) nzero_counts / (double) nbucket);
}
free (counts);
}
/* This function handles the traditional System V-style hash table format. */
static void
handle_sysv_hash (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx)
{
Elf_Data *data = elf_getdata (scn, NULL);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get data for section %d: %s"),
(int) elf_ndxscn (scn), elf_errmsg (-1));
return;
}
if (unlikely (data->d_size < 2 * sizeof (Elf32_Word)))
{
invalid_data:
error (0, 0, gettext ("invalid data in sysv.hash section %d"),
(int) elf_ndxscn (scn));
return;
}
Elf32_Word nbucket = ((Elf32_Word *) data->d_buf)[0];
Elf32_Word nchain = ((Elf32_Word *) data->d_buf)[1];
uint64_t used_buf = (2ULL + nchain + nbucket) * sizeof (Elf32_Word);
if (used_buf > data->d_size)
goto invalid_data;
Elf32_Word *bucket = &((Elf32_Word *) data->d_buf)[2];
Elf32_Word *chain = &((Elf32_Word *) data->d_buf)[2 + nbucket];
uint32_t *lengths = (uint32_t *) xcalloc (nbucket, sizeof (uint32_t));
uint_fast32_t maxlength = 0;
uint_fast32_t nsyms = 0;
for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt)
{
Elf32_Word inner = bucket[cnt];
while (inner > 0 && inner < nchain)
{
++nsyms;
if (maxlength < ++lengths[cnt])
++maxlength;
inner = chain[inner];
}
}
print_hash_info (ebl, scn, shdr, shstrndx, maxlength, nbucket, nsyms,
lengths, NULL);
free (lengths);
}
/* This function handles the incorrect, System V-style hash table
format some 64-bit architectures use. */
static void
handle_sysv_hash64 (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx)
{
Elf_Data *data = elf_getdata (scn, NULL);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get data for section %d: %s"),
(int) elf_ndxscn (scn), elf_errmsg (-1));
return;
}
if (unlikely (data->d_size < 2 * sizeof (Elf64_Xword)))
{
invalid_data:
error (0, 0, gettext ("invalid data in sysv.hash64 section %d"),
(int) elf_ndxscn (scn));
return;
}
Elf64_Xword nbucket = ((Elf64_Xword *) data->d_buf)[0];
Elf64_Xword nchain = ((Elf64_Xword *) data->d_buf)[1];
uint64_t maxwords = data->d_size / sizeof (Elf64_Xword);
if (maxwords < 2
|| maxwords - 2 < nbucket
|| maxwords - 2 - nbucket < nchain)
goto invalid_data;
Elf64_Xword *bucket = &((Elf64_Xword *) data->d_buf)[2];
Elf64_Xword *chain = &((Elf64_Xword *) data->d_buf)[2 + nbucket];
uint32_t *lengths = (uint32_t *) xcalloc (nbucket, sizeof (uint32_t));
uint_fast32_t maxlength = 0;
uint_fast32_t nsyms = 0;
for (Elf64_Xword cnt = 0; cnt < nbucket; ++cnt)
{
Elf64_Xword inner = bucket[cnt];
while (inner > 0 && inner < nchain)
{
++nsyms;
if (maxlength < ++lengths[cnt])
++maxlength;
inner = chain[inner];
}
}
print_hash_info (ebl, scn, shdr, shstrndx, maxlength, nbucket, nsyms,
lengths, NULL);
free (lengths);
}
/* This function handles the GNU-style hash table format. */
static void
handle_gnu_hash (Ebl *ebl, Elf_Scn *scn, GElf_Shdr *shdr, size_t shstrndx)
{
uint32_t *lengths = NULL;
Elf_Data *data = elf_getdata (scn, NULL);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get data for section %d: %s"),
(int) elf_ndxscn (scn), elf_errmsg (-1));
return;
}
if (unlikely (data->d_size < 4 * sizeof (Elf32_Word)))
{
invalid_data:
free (lengths);
error (0, 0, gettext ("invalid data in gnu.hash section %d"),
(int) elf_ndxscn (scn));
return;
}
Elf32_Word nbucket = ((Elf32_Word *) data->d_buf)[0];
Elf32_Word symbias = ((Elf32_Word *) data->d_buf)[1];
/* Next comes the size of the bitmap. It's measured in words for
the architecture. It's 32 bits for 32 bit archs, and 64 bits for
64 bit archs. There is always a bloom filter present, so zero is
an invalid value. */
Elf32_Word bitmask_words = ((Elf32_Word *) data->d_buf)[2];
if (gelf_getclass (ebl->elf) == ELFCLASS64)
bitmask_words *= 2;
if (bitmask_words == 0)
goto invalid_data;
Elf32_Word shift = ((Elf32_Word *) data->d_buf)[3];
/* Is there still room for the sym chain?
Use uint64_t calculation to prevent 32bit overlow. */
uint64_t used_buf = (4ULL + bitmask_words + nbucket) * sizeof (Elf32_Word);
uint32_t max_nsyms = (data->d_size - used_buf) / sizeof (Elf32_Word);
if (used_buf > data->d_size)
goto invalid_data;
lengths = (uint32_t *) xcalloc (nbucket, sizeof (uint32_t));
Elf32_Word *bitmask = &((Elf32_Word *) data->d_buf)[4];
Elf32_Word *bucket = &((Elf32_Word *) data->d_buf)[4 + bitmask_words];
Elf32_Word *chain = &((Elf32_Word *) data->d_buf)[4 + bitmask_words
+ nbucket];
/* Compute distribution of chain lengths. */
uint_fast32_t maxlength = 0;
uint_fast32_t nsyms = 0;
for (Elf32_Word cnt = 0; cnt < nbucket; ++cnt)
if (bucket[cnt] != 0)
{
Elf32_Word inner = bucket[cnt] - symbias;
do
{
++nsyms;
if (maxlength < ++lengths[cnt])
++maxlength;
if (inner > max_nsyms)
goto invalid_data;
}
while ((chain[inner++] & 1) == 0);
}
/* Count bits in bitmask. */
uint_fast32_t nbits = 0;
for (Elf32_Word cnt = 0; cnt < bitmask_words; ++cnt)
{
uint_fast32_t word = bitmask[cnt];
word = (word & 0x55555555) + ((word >> 1) & 0x55555555);
word = (word & 0x33333333) + ((word >> 2) & 0x33333333);
word = (word & 0x0f0f0f0f) + ((word >> 4) & 0x0f0f0f0f);
word = (word & 0x00ff00ff) + ((word >> 8) & 0x00ff00ff);
nbits += (word & 0x0000ffff) + ((word >> 16) & 0x0000ffff);
}
char *str;
if (unlikely (asprintf (&str, gettext ("\
Symbol Bias: %u\n\
Bitmask Size: %zu bytes %" PRIuFAST32 "%% bits set 2nd hash shift: %u\n"),
(unsigned int) symbias,
bitmask_words * sizeof (Elf32_Word),
((nbits * 100 + 50)
/ (uint_fast32_t) (bitmask_words
* sizeof (Elf32_Word) * 8)),
(unsigned int) shift) == -1))
error (EXIT_FAILURE, 0, gettext ("memory exhausted"));
print_hash_info (ebl, scn, shdr, shstrndx, maxlength, nbucket, nsyms,
lengths, str);
free (str);
free (lengths);
}
/* Find the symbol table(s). For this we have to search through the
section table. */
static void
handle_hash (Ebl *ebl)
{
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
/* Handle the section if it is a symbol table. */
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (likely (shdr != NULL))
{
if ((shdr->sh_type == SHT_HASH || shdr->sh_type == SHT_GNU_HASH)
&& (shdr->sh_flags & SHF_COMPRESSED) != 0)
{
if (elf_compress (scn, 0, 0) < 0)
printf ("WARNING: %s [%zd]\n",
gettext ("Couldn't uncompress section"),
elf_ndxscn (scn));
shdr = gelf_getshdr (scn, &shdr_mem);
}
if (shdr->sh_type == SHT_HASH)
{
if (ebl_sysvhash_entrysize (ebl) == sizeof (Elf64_Xword))
handle_sysv_hash64 (ebl, scn, shdr, shstrndx);
else
handle_sysv_hash (ebl, scn, shdr, shstrndx);
}
else if (shdr->sh_type == SHT_GNU_HASH)
handle_gnu_hash (ebl, scn, shdr, shstrndx);
}
}
}
static void
print_liblist (Ebl *ebl)
{
/* Find the library list sections. For this we have to search
through the section table. */
Elf_Scn *scn = NULL;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr != NULL && shdr->sh_type == SHT_GNU_LIBLIST)
{
size_t sh_entsize = gelf_fsize (ebl->elf, ELF_T_LIB, 1, EV_CURRENT);
int nentries = shdr->sh_size / sh_entsize;
printf (ngettext ("\
\nLibrary list section [%2zu] '%s' at offset %#0" PRIx64 " contains %d entry:\n",
"\
\nLibrary list section [%2zu] '%s' at offset %#0" PRIx64 " contains %d entries:\n",
nentries),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
shdr->sh_offset,
nentries);
Elf_Data *data = elf_getdata (scn, NULL);
if (data == NULL)
return;
puts (gettext ("\
Library Time Stamp Checksum Version Flags"));
for (int cnt = 0; cnt < nentries; ++cnt)
{
GElf_Lib lib_mem;
GElf_Lib *lib = gelf_getlib (data, cnt, &lib_mem);
if (unlikely (lib == NULL))
continue;
time_t t = (time_t) lib->l_time_stamp;
struct tm *tm = gmtime (&t);
if (unlikely (tm == NULL))
continue;
printf (" [%2d] %-29s %04u-%02u-%02uT%02u:%02u:%02u %08x %-7u %u\n",
cnt, elf_strptr (ebl->elf, shdr->sh_link, lib->l_name),
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec,
(unsigned int) lib->l_checksum,
(unsigned int) lib->l_version,
(unsigned int) lib->l_flags);
}
}
}
}
static void
print_attributes (Ebl *ebl, const GElf_Ehdr *ehdr)
{
/* Find the object attributes sections. For this we have to search
through the section table. */
Elf_Scn *scn = NULL;
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr == NULL || (shdr->sh_type != SHT_GNU_ATTRIBUTES
&& (shdr->sh_type != SHT_ARM_ATTRIBUTES
|| ehdr->e_machine != EM_ARM)))
continue;
printf (gettext ("\
\nObject attributes section [%2zu] '%s' of %" PRIu64
" bytes at offset %#0" PRIx64 ":\n"),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
shdr->sh_size, shdr->sh_offset);
Elf_Data *data = elf_rawdata (scn, NULL);
if (unlikely (data == NULL || data->d_size == 0))
return;
const unsigned char *p = data->d_buf;
/* There is only one 'version', A. */
if (unlikely (*p++ != 'A'))
return;
fputs_unlocked (gettext (" Owner Size\n"), stdout);
inline size_t left (void)
{
return (const unsigned char *) data->d_buf + data->d_size - p;
}
/* Loop over the sections. */
while (left () >= 4)
{
/* Section length. */
uint32_t len;
memcpy (&len, p, sizeof len);
if (MY_ELFDATA != ehdr->e_ident[EI_DATA])
CONVERT (len);
if (unlikely (len > left ()))
break;
/* Section vendor name. */
const unsigned char *name = p + sizeof len;
p += len;
unsigned const char *q = memchr (name, '\0', len);
if (unlikely (q == NULL))
break;
++q;
printf (gettext (" %-13s %4" PRIu32 "\n"), name, len);
bool gnu_vendor = (q - name == sizeof "gnu"
&& !memcmp (name, "gnu", sizeof "gnu"));
/* Loop over subsections. */
if (shdr->sh_type != SHT_GNU_ATTRIBUTES
|| gnu_vendor)
while (q < p)
{
const unsigned char *const sub = q;
unsigned int subsection_tag;
get_uleb128 (subsection_tag, q, p);
if (unlikely (q >= p))
break;
uint32_t subsection_len;
if (unlikely (p - sub < (ptrdiff_t) sizeof subsection_len))
break;
memcpy (&subsection_len, q, sizeof subsection_len);
if (MY_ELFDATA != ehdr->e_ident[EI_DATA])
CONVERT (subsection_len);
/* Don't overflow, ptrdiff_t might be 32bits, but signed. */
if (unlikely (subsection_len == 0
|| subsection_len >= (uint32_t) PTRDIFF_MAX
|| p - sub < (ptrdiff_t) subsection_len))
break;
const unsigned char *r = q + sizeof subsection_len;
q = sub + subsection_len;
switch (subsection_tag)
{
default:
/* Unknown subsection, print and skip. */
printf (gettext (" %-4u %12" PRIu32 "\n"),
subsection_tag, subsection_len);
break;
case 1: /* Tag_File */
printf (gettext (" File: %11" PRIu32 "\n"),
subsection_len);
while (r < q)
{
unsigned int tag;
get_uleb128 (tag, r, q);
if (unlikely (r >= q))
break;
/* GNU style tags have either a uleb128 value,
when lowest bit is not set, or a string
when the lowest bit is set.
"compatibility" (32) is special. It has
both a string and a uleb128 value. For
non-gnu we assume 6 till 31 only take ints.
XXX see arm backend, do we need a separate
hook? */
uint64_t value = 0;
const char *string = NULL;
if (tag == 32 || (tag & 1) == 0
|| (! gnu_vendor && (tag > 5 && tag < 32)))
{
get_uleb128 (value, r, q);
if (r > q)
break;
}
if (tag == 32
|| ((tag & 1) != 0
&& (gnu_vendor
|| (! gnu_vendor && tag > 32)))
|| (! gnu_vendor && tag > 3 && tag < 6))
{
string = (const char *) r;
r = memchr (r, '\0', q - r);
if (r == NULL)
break;
++r;
}
const char *tag_name = NULL;
const char *value_name = NULL;
ebl_check_object_attribute (ebl, (const char *) name,
tag, value,
&tag_name, &value_name);
if (tag_name != NULL)
{
if (tag == 32)
printf (gettext (" %s: %" PRId64 ", %s\n"),
tag_name, value, string);
else if (string == NULL && value_name == NULL)
printf (gettext (" %s: %" PRId64 "\n"),
tag_name, value);
else
printf (gettext (" %s: %s\n"),
tag_name, string ?: value_name);
}
else
{
/* For "gnu" vendor 32 "compatibility" has
already been handled above. */
assert (tag != 32
|| strcmp ((const char *) name, "gnu"));
if (string == NULL)
printf (gettext (" %u: %" PRId64 "\n"),
tag, value);
else
printf (gettext (" %u: %s\n"),
tag, string);
}
}
}
}
}
}
}
static char *
format_dwarf_addr (Dwfl_Module *dwflmod,
int address_size, Dwarf_Addr address, Dwarf_Addr raw)
{
/* See if there is a name we can give for this address. */
GElf_Sym sym;
GElf_Off off = 0;
const char *name = (print_address_names && ! print_unresolved_addresses)
? dwfl_module_addrinfo (dwflmod, address, &off, &sym, NULL, NULL, NULL)
: NULL;
const char *scn;
if (print_unresolved_addresses)
{
address = raw;
scn = NULL;
}
else
{
/* Relativize the address. */
int n = dwfl_module_relocations (dwflmod);
int i = n < 1 ? -1 : dwfl_module_relocate_address (dwflmod, &address);
/* In an ET_REL file there is a section name to refer to. */
scn = (i < 0 ? NULL
: dwfl_module_relocation_info (dwflmod, i, NULL));
}
char *result;
if ((name != NULL
? (off != 0
? (scn != NULL
? (address_size == 0
? asprintf (&result,
gettext ("%s+%#" PRIx64 " <%s+%#" PRIx64 ">"),
scn, address, name, off)
: asprintf (&result,
gettext ("%s+%#0*" PRIx64 " <%s+%#" PRIx64 ">"),
scn, 2 + address_size * 2, address,
name, off))
: (address_size == 0
? asprintf (&result,
gettext ("%#" PRIx64 " <%s+%#" PRIx64 ">"),
address, name, off)
: asprintf (&result,
gettext ("%#0*" PRIx64 " <%s+%#" PRIx64 ">"),
2 + address_size * 2, address,
name, off)))
: (scn != NULL
? (address_size == 0
? asprintf (&result,
gettext ("%s+%#" PRIx64 " <%s>"),
scn, address, name)
: asprintf (&result,
gettext ("%s+%#0*" PRIx64 " <%s>"),
scn, 2 + address_size * 2, address, name))
: (address_size == 0
? asprintf (&result,
gettext ("%#" PRIx64 " <%s>"),
address, name)
: asprintf (&result,
gettext ("%#0*" PRIx64 " <%s>"),
2 + address_size * 2, address, name))))
: (scn != NULL
? (address_size == 0
? asprintf (&result,
gettext ("%s+%#" PRIx64),
scn, address)
: asprintf (&result,
gettext ("%s+%#0*" PRIx64),
scn, 2 + address_size * 2, address))
: (address_size == 0
? asprintf (&result,
"%#" PRIx64,
address)
: asprintf (&result,
"%#0*" PRIx64,
2 + address_size * 2, address)))) < 0)
error (EXIT_FAILURE, 0, _("memory exhausted"));
return result;
}
static const char *
dwarf_tag_string (unsigned int tag)
{
switch (tag)
{
#define DWARF_ONE_KNOWN_DW_TAG(NAME, CODE) case CODE: return #NAME;
DWARF_ALL_KNOWN_DW_TAG
#undef DWARF_ONE_KNOWN_DW_TAG
default:
return NULL;
}
}
static const char *
dwarf_attr_string (unsigned int attrnum)
{
switch (attrnum)
{
#define DWARF_ONE_KNOWN_DW_AT(NAME, CODE) case CODE: return #NAME;
DWARF_ALL_KNOWN_DW_AT
#undef DWARF_ONE_KNOWN_DW_AT
default:
return NULL;
}
}
static const char *
dwarf_form_string (unsigned int form)
{
switch (form)
{
#define DWARF_ONE_KNOWN_DW_FORM(NAME, CODE) case CODE: return #NAME;
DWARF_ALL_KNOWN_DW_FORM
#undef DWARF_ONE_KNOWN_DW_FORM
default:
return NULL;
}
}
static const char *
dwarf_lang_string (unsigned int lang)
{
switch (lang)
{
#define DWARF_ONE_KNOWN_DW_LANG(NAME, CODE) case CODE: return #NAME;
DWARF_ALL_KNOWN_DW_LANG
#undef DWARF_ONE_KNOWN_DW_LANG
default:
return NULL;
}
}
static const char *
dwarf_inline_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_INL(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_INL
#undef DWARF_ONE_KNOWN_DW_INL
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_encoding_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_ATE(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_ATE
#undef DWARF_ONE_KNOWN_DW_ATE
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_access_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_ACCESS(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_ACCESS
#undef DWARF_ONE_KNOWN_DW_ACCESS
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_visibility_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_VIS(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_VIS
#undef DWARF_ONE_KNOWN_DW_VIS
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_virtuality_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_VIRTUALITY(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_VIRTUALITY
#undef DWARF_ONE_KNOWN_DW_VIRTUALITY
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_identifier_case_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_ID(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_ID
#undef DWARF_ONE_KNOWN_DW_ID
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_calling_convention_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_CC(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_CC
#undef DWARF_ONE_KNOWN_DW_CC
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_ordering_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_ORD(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_ORD
#undef DWARF_ONE_KNOWN_DW_ORD
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_discr_list_string (unsigned int code)
{
static const char *const known[] =
{
#define DWARF_ONE_KNOWN_DW_DSC(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_DSC
#undef DWARF_ONE_KNOWN_DW_DSC
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
static const char *
dwarf_locexpr_opcode_string (unsigned int code)
{
static const char *const known[] =
{
/* Normally we can't affort building huge table of 64K entries,
most of them zero, just because there are a couple defined
values at the far end. In case of opcodes, it's OK. */
#define DWARF_ONE_KNOWN_DW_OP(NAME, CODE) [CODE] = #NAME,
DWARF_ALL_KNOWN_DW_OP
#undef DWARF_ONE_KNOWN_DW_OP
};
if (likely (code < sizeof (known) / sizeof (known[0])))
return known[code];
return NULL;
}
/* Used by all dwarf_foo_name functions. */
static const char *
string_or_unknown (const char *known, unsigned int code,
unsigned int lo_user, unsigned int hi_user,
bool print_unknown_num)
{
static char unknown_buf[20];
if (likely (known != NULL))
return known;
if (lo_user != 0 && code >= lo_user && code <= hi_user)
{
snprintf (unknown_buf, sizeof unknown_buf, "lo_user+%#x",
code - lo_user);
return unknown_buf;
}
if (print_unknown_num)
{
snprintf (unknown_buf, sizeof unknown_buf, "??? (%#x)", code);
return unknown_buf;
}
return "???";
}
static const char *
dwarf_tag_name (unsigned int tag)
{
const char *ret = dwarf_tag_string (tag);
return string_or_unknown (ret, tag, DW_TAG_lo_user, DW_TAG_hi_user, true);
}
static const char *
dwarf_attr_name (unsigned int attr)
{
const char *ret = dwarf_attr_string (attr);
return string_or_unknown (ret, attr, DW_AT_lo_user, DW_AT_hi_user, true);
}
static const char *
dwarf_form_name (unsigned int form)
{
const char *ret = dwarf_form_string (form);
return string_or_unknown (ret, form, 0, 0, true);
}
static const char *
dwarf_lang_name (unsigned int lang)
{
const char *ret = dwarf_lang_string (lang);
return string_or_unknown (ret, lang, DW_LANG_lo_user, DW_LANG_hi_user, false);
}
static const char *
dwarf_inline_name (unsigned int code)
{
const char *ret = dwarf_inline_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static const char *
dwarf_encoding_name (unsigned int code)
{
const char *ret = dwarf_encoding_string (code);
return string_or_unknown (ret, code, DW_ATE_lo_user, DW_ATE_hi_user, false);
}
static const char *
dwarf_access_name (unsigned int code)
{
const char *ret = dwarf_access_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static const char *
dwarf_visibility_name (unsigned int code)
{
const char *ret = dwarf_visibility_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static const char *
dwarf_virtuality_name (unsigned int code)
{
const char *ret = dwarf_virtuality_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static const char *
dwarf_identifier_case_name (unsigned int code)
{
const char *ret = dwarf_identifier_case_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static const char *
dwarf_calling_convention_name (unsigned int code)
{
const char *ret = dwarf_calling_convention_string (code);
return string_or_unknown (ret, code, DW_CC_lo_user, DW_CC_hi_user, false);
}
static const char *
dwarf_ordering_name (unsigned int code)
{
const char *ret = dwarf_ordering_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static const char *
dwarf_discr_list_name (unsigned int code)
{
const char *ret = dwarf_discr_list_string (code);
return string_or_unknown (ret, code, 0, 0, false);
}
static void
print_block (size_t n, const void *block)
{
if (n == 0)
puts (_("empty block"));
else
{
printf (_("%zu byte block:"), n);
const unsigned char *data = block;
do
printf (" %02x", *data++);
while (--n > 0);
putchar ('\n');
}
}
static void
print_ops (Dwfl_Module *dwflmod, Dwarf *dbg, int indent, int indentrest,
unsigned int vers, unsigned int addrsize, unsigned int offset_size,
struct Dwarf_CU *cu, Dwarf_Word len, const unsigned char *data)
{
const unsigned int ref_size = vers < 3 ? addrsize : offset_size;
if (len == 0)
{
printf ("%*s(empty)\n", indent, "");
return;
}
#define NEED(n) if (len < (Dwarf_Word) (n)) goto invalid
#define CONSUME(n) NEED (n); else len -= (n)
Dwarf_Word offset = 0;
while (len-- > 0)
{
uint_fast8_t op = *data++;
const char *op_name = dwarf_locexpr_opcode_string (op);
if (unlikely (op_name == NULL))
{
static char buf[20];
if (op >= DW_OP_lo_user)
snprintf (buf, sizeof buf, "lo_user+%#x", op - DW_OP_lo_user);
else
snprintf (buf, sizeof buf, "??? (%#x)", op);
op_name = buf;
}
switch (op)
{
case DW_OP_addr:;
/* Address operand. */
Dwarf_Word addr;
NEED (addrsize);
if (addrsize == 4)
addr = read_4ubyte_unaligned (dbg, data);
else if (addrsize == 8)
addr = read_8ubyte_unaligned (dbg, data);
else
goto invalid;
data += addrsize;
CONSUME (addrsize);
char *a = format_dwarf_addr (dwflmod, 0, addr, addr);
printf ("%*s[%4" PRIuMAX "] %s %s\n",
indent, "", (uintmax_t) offset, op_name, a);
free (a);
offset += 1 + addrsize;
break;
case DW_OP_call_ref:
/* Offset operand. */
if (ref_size != 4 && ref_size != 8)
goto invalid; /* Cannot be used in CFA. */
NEED (ref_size);
if (ref_size == 4)
addr = read_4ubyte_unaligned (dbg, data);
else
addr = read_8ubyte_unaligned (dbg, data);
data += ref_size;
CONSUME (ref_size);
printf ("%*s[%4" PRIuMAX "] %s %#" PRIxMAX "\n",
indent, "", (uintmax_t) offset,
op_name, (uintmax_t) addr);
offset += 1 + ref_size;
break;
case DW_OP_deref_size:
case DW_OP_xderef_size:
case DW_OP_pick:
case DW_OP_const1u:
// XXX value might be modified by relocation
NEED (1);
printf ("%*s[%4" PRIuMAX "] %s %" PRIu8 "\n",
indent, "", (uintmax_t) offset,
op_name, *((uint8_t *) data));
++data;
--len;
offset += 2;
break;
case DW_OP_const2u:
NEED (2);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRIu16 "\n",
indent, "", (uintmax_t) offset,
op_name, read_2ubyte_unaligned (dbg, data));
CONSUME (2);
data += 2;
offset += 3;
break;
case DW_OP_const4u:
NEED (4);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRIu32 "\n",
indent, "", (uintmax_t) offset,
op_name, read_4ubyte_unaligned (dbg, data));
CONSUME (4);
data += 4;
offset += 5;
break;
case DW_OP_const8u:
NEED (8);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRIu64 "\n",
indent, "", (uintmax_t) offset,
op_name, (uint64_t) read_8ubyte_unaligned (dbg, data));
CONSUME (8);
data += 8;
offset += 9;
break;
case DW_OP_const1s:
NEED (1);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRId8 "\n",
indent, "", (uintmax_t) offset,
op_name, *((int8_t *) data));
++data;
--len;
offset += 2;
break;
case DW_OP_const2s:
NEED (2);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRId16 "\n",
indent, "", (uintmax_t) offset,
op_name, read_2sbyte_unaligned (dbg, data));
CONSUME (2);
data += 2;
offset += 3;
break;
case DW_OP_const4s:
NEED (4);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRId32 "\n",
indent, "", (uintmax_t) offset,
op_name, read_4sbyte_unaligned (dbg, data));
CONSUME (4);
data += 4;
offset += 5;
break;
case DW_OP_const8s:
NEED (8);
// XXX value might be modified by relocation
printf ("%*s[%4" PRIuMAX "] %s %" PRId64 "\n",
indent, "", (uintmax_t) offset,
op_name, read_8sbyte_unaligned (dbg, data));
CONSUME (8);
data += 8;
offset += 9;
break;
case DW_OP_piece:
case DW_OP_regx:
case DW_OP_plus_uconst:
case DW_OP_constu:;
const unsigned char *start = data;
uint64_t uleb;
NEED (1);
get_uleb128 (uleb, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s %" PRIu64 "\n",
indent, "", (uintmax_t) offset, op_name, uleb);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_bit_piece:
start = data;
uint64_t uleb2;
NEED (1);
get_uleb128 (uleb, data, data + len);
NEED (1);
get_uleb128 (uleb2, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s %" PRIu64 ", %" PRIu64 "\n",
indent, "", (uintmax_t) offset, op_name, uleb, uleb2);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_fbreg:
case DW_OP_breg0 ... DW_OP_breg31:
case DW_OP_consts:
start = data;
int64_t sleb;
NEED (1);
get_sleb128 (sleb, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s %" PRId64 "\n",
indent, "", (uintmax_t) offset, op_name, sleb);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_bregx:
start = data;
NEED (1);
get_uleb128 (uleb, data, data + len);
NEED (1);
get_sleb128 (sleb, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s %" PRIu64 " %" PRId64 "\n",
indent, "", (uintmax_t) offset, op_name, uleb, sleb);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_call2:
NEED (2);
printf ("%*s[%4" PRIuMAX "] %s %" PRIu16 "\n",
indent, "", (uintmax_t) offset, op_name,
read_2ubyte_unaligned (dbg, data));
CONSUME (2);
offset += 3;
break;
case DW_OP_call4:
NEED (4);
printf ("%*s[%4" PRIuMAX "] %s %" PRIu32 "\n",
indent, "", (uintmax_t) offset, op_name,
read_4ubyte_unaligned (dbg, data));
CONSUME (4);
offset += 5;
break;
case DW_OP_skip:
case DW_OP_bra:
NEED (2);
printf ("%*s[%4" PRIuMAX "] %s %" PRIuMAX "\n",
indent, "", (uintmax_t) offset, op_name,
(uintmax_t) (offset + read_2sbyte_unaligned (dbg, data) + 3));
CONSUME (2);
data += 2;
offset += 3;
break;
case DW_OP_implicit_value:
start = data;
NEED (1);
get_uleb128 (uleb, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s: ",
indent, "", (uintmax_t) offset, op_name);
NEED (uleb);
print_block (uleb, data);
data += uleb;
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_implicit_pointer:
/* DIE offset operand. */
start = data;
NEED (ref_size);
if (ref_size != 4 && ref_size != 8)
goto invalid; /* Cannot be used in CFA. */
if (ref_size == 4)
addr = read_4ubyte_unaligned (dbg, data);
else
addr = read_8ubyte_unaligned (dbg, data);
data += ref_size;
/* Byte offset operand. */
NEED (1);
get_sleb128 (sleb, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s [%6" PRIxMAX "] %+" PRId64 "\n",
indent, "", (intmax_t) offset,
op_name, (uintmax_t) addr, sleb);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_entry_value:
/* Size plus expression block. */
start = data;
NEED (1);
get_uleb128 (uleb, data, data + len);
printf ("%*s[%4" PRIuMAX "] %s:\n",
indent, "", (uintmax_t) offset, op_name);
NEED (uleb);
print_ops (dwflmod, dbg, indent + 6, indent + 6, vers,
addrsize, offset_size, cu, uleb, data);
data += uleb;
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_const_type:
/* uleb128 CU relative DW_TAG_base_type DIE offset, 1-byte
unsigned size plus block. */
start = data;
NEED (1);
get_uleb128 (uleb, data, data + len);
if (! print_unresolved_addresses && cu != NULL)
uleb += cu->start;
NEED (1);
uint8_t usize = *(uint8_t *) data++;
NEED (usize);
printf ("%*s[%4" PRIuMAX "] %s [%6" PRIxMAX "] ",
indent, "", (uintmax_t) offset, op_name, uleb);
print_block (usize, data);
data += usize;
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_regval_type:
/* uleb128 register number, uleb128 CU relative
DW_TAG_base_type DIE offset. */
start = data;
NEED (1);
get_uleb128 (uleb, data, data + len);
NEED (1);
get_uleb128 (uleb2, data, data + len);
if (! print_unresolved_addresses && cu != NULL)
uleb2 += cu->start;
printf ("%*s[%4" PRIuMAX "] %s %" PRIu64 " [%6" PRIx64 "]\n",
indent, "", (uintmax_t) offset, op_name, uleb, uleb2);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_deref_type:
/* 1-byte unsigned size of value, uleb128 CU relative
DW_TAG_base_type DIE offset. */
start = data;
NEED (1);
usize = *(uint8_t *) data++;
NEED (1);
get_uleb128 (uleb, data, data + len);
if (! print_unresolved_addresses && cu != NULL)
uleb += cu->start;
printf ("%*s[%4" PRIuMAX "] %s %" PRIu8 " [%6" PRIxMAX "]\n",
indent, "", (uintmax_t) offset,
op_name, usize, uleb);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_convert:
case DW_OP_GNU_reinterpret:
/* uleb128 CU relative offset to DW_TAG_base_type, or zero
for conversion to untyped. */
start = data;
NEED (1);
get_uleb128 (uleb, data, data + len);
if (uleb != 0 && ! print_unresolved_addresses && cu != NULL)
uleb += cu->start;
printf ("%*s[%4" PRIuMAX "] %s [%6" PRIxMAX "]\n",
indent, "", (uintmax_t) offset, op_name, uleb);
CONSUME (data - start);
offset += 1 + (data - start);
break;
case DW_OP_GNU_parameter_ref:
/* 4 byte CU relative reference to the abstract optimized away
DW_TAG_formal_parameter. */
NEED (4);
uintmax_t param_off = (uintmax_t) read_4ubyte_unaligned (dbg, data);
if (! print_unresolved_addresses && cu != NULL)
param_off += cu->start;
printf ("%*s[%4" PRIuMAX "] %s [%6" PRIxMAX "]\n",
indent, "", (uintmax_t) offset, op_name, param_off);
CONSUME (4);
data += 4;
offset += 5;
break;
default:
/* No Operand. */
printf ("%*s[%4" PRIuMAX "] %s\n",
indent, "", (uintmax_t) offset, op_name);
++offset;
break;
}
indent = indentrest;
continue;
invalid:
printf (gettext ("%*s[%4" PRIuMAX "] %s <TRUNCATED>\n"),
indent, "", (uintmax_t) offset, op_name);
break;
}
}
struct listptr
{
Dwarf_Off offset:(64 - 3);
bool addr64:1;
bool dwarf64:1;
bool warned:1;
struct Dwarf_CU *cu;
};
#define listptr_offset_size(p) ((p)->dwarf64 ? 8 : 4)
#define listptr_address_size(p) ((p)->addr64 ? 8 : 4)
static Dwarf_Addr
listptr_base (struct listptr *p)
{
Dwarf_Addr base;
Dwarf_Die cu = CUDIE (p->cu);
/* Find the base address of the compilation unit. It will normally
be specified by DW_AT_low_pc. In DWARF-3 draft 4, the base
address could be overridden by DW_AT_entry_pc. It's been
removed, but GCC emits DW_AT_entry_pc and not DW_AT_lowpc for
compilation units with discontinuous ranges. */
if (unlikely (dwarf_lowpc (&cu, &base) != 0))
{
Dwarf_Attribute attr_mem;
if (dwarf_formaddr (dwarf_attr (&cu, DW_AT_entry_pc, &attr_mem),
&base) != 0)
base = 0;
}
return base;
}
static int
compare_listptr (const void *a, const void *b, void *arg)
{
const char *name = arg;
struct listptr *p1 = (void *) a;
struct listptr *p2 = (void *) b;
if (p1->offset < p2->offset)
return -1;
if (p1->offset > p2->offset)
return 1;
if (!p1->warned && !p2->warned)
{
if (p1->addr64 != p2->addr64)
{
p1->warned = p2->warned = true;
error (0, 0,
gettext ("%s %#" PRIx64 " used with different address sizes"),
name, (uint64_t) p1->offset);
}
if (p1->dwarf64 != p2->dwarf64)
{
p1->warned = p2->warned = true;
error (0, 0,
gettext ("%s %#" PRIx64 " used with different offset sizes"),
name, (uint64_t) p1->offset);
}
if (listptr_base (p1) != listptr_base (p2))
{
p1->warned = p2->warned = true;
error (0, 0,
gettext ("%s %#" PRIx64 " used with different base addresses"),
name, (uint64_t) p1->offset);
}
}
return 0;
}
struct listptr_table
{
size_t n;
size_t alloc;
struct listptr *table;
};
static struct listptr_table known_loclistptr;
static struct listptr_table known_rangelistptr;
static void
reset_listptr (struct listptr_table *table)
{
free (table->table);
table->table = NULL;
table->n = table->alloc = 0;
}
/* Returns false if offset doesn't fit. See struct listptr. */
static bool
notice_listptr (enum section_e section, struct listptr_table *table,
uint_fast8_t address_size, uint_fast8_t offset_size,
struct Dwarf_CU *cu, Dwarf_Off offset)
{
if (print_debug_sections & section)
{
if (table->n == table->alloc)
{
if (table->alloc == 0)
table->alloc = 128;
else
table->alloc *= 2;
table->table = xrealloc (table->table,
table->alloc * sizeof table->table[0]);
}
struct listptr *p = &table->table[table->n++];
*p = (struct listptr)
{
.addr64 = address_size == 8,
.dwarf64 = offset_size == 8,
.offset = offset,
.cu = cu
};
if (p->offset != offset)
{
table->n--;
return false;
}
}
return true;
}
static void
sort_listptr (struct listptr_table *table, const char *name)
{
if (table->n > 0)
qsort_r (table->table, table->n, sizeof table->table[0],
&compare_listptr, (void *) name);
}
static bool
skip_listptr_hole (struct listptr_table *table, size_t *idxp,
uint_fast8_t *address_sizep, uint_fast8_t *offset_sizep,
Dwarf_Addr *base, struct Dwarf_CU **cu, ptrdiff_t offset,
unsigned char **readp, unsigned char *endp)
{
if (table->n == 0)
return false;
while (*idxp < table->n && table->table[*idxp].offset < (Dwarf_Off) offset)
++*idxp;
struct listptr *p = &table->table[*idxp];
if (*idxp == table->n
|| p->offset >= (Dwarf_Off) (endp - *readp + offset))
{
*readp = endp;
printf (gettext (" [%6tx] <UNUSED GARBAGE IN REST OF SECTION>\n"),
offset);
return true;
}
if (p->offset != (Dwarf_Off) offset)
{
*readp += p->offset - offset;
printf (gettext (" [%6tx] <UNUSED GARBAGE> ... %" PRIu64 " bytes ...\n"),
offset, (Dwarf_Off) p->offset - offset);
return true;
}
if (address_sizep != NULL)
*address_sizep = listptr_address_size (p);
if (offset_sizep != NULL)
*offset_sizep = listptr_offset_size (p);
if (base != NULL)
*base = listptr_base (p);
if (cu != NULL)
*cu = p->cu;
return false;
}
static void
print_debug_abbrev_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
const size_t sh_size = (dbg->sectiondata[IDX_debug_abbrev] ?
dbg->sectiondata[IDX_debug_abbrev]->d_size : 0);
printf (gettext ("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"
" [ Code]\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
Dwarf_Off offset = 0;
while (offset < sh_size)
{
printf (gettext ("\nAbbreviation section at offset %" PRIu64 ":\n"),
offset);
while (1)
{
size_t length;
Dwarf_Abbrev abbrev;
int res = dwarf_offabbrev (dbg, offset, &length, &abbrev);
if (res != 0)
{
if (unlikely (res < 0))
{
printf (gettext ("\
*** error while reading abbreviation: %s\n"),
dwarf_errmsg (-1));
return;
}
/* This is the NUL byte at the end of the section. */
++offset;
break;
}
/* We know these calls can never fail. */
unsigned int code = dwarf_getabbrevcode (&abbrev);
unsigned int tag = dwarf_getabbrevtag (&abbrev);
int has_children = dwarf_abbrevhaschildren (&abbrev);
printf (gettext (" [%5u] offset: %" PRId64
", children: %s, tag: %s\n"),
code, (int64_t) offset,
has_children ? gettext ("yes") : gettext ("no"),
dwarf_tag_name (tag));
size_t cnt = 0;
unsigned int name;
unsigned int form;
Dwarf_Off enoffset;
while (dwarf_getabbrevattr (&abbrev, cnt,
&name, &form, &enoffset) == 0)
{
printf (" attr: %s, form: %s, offset: %#" PRIx64 "\n",
dwarf_attr_name (name), dwarf_form_name (form),
(uint64_t) enoffset);
++cnt;
}
offset += length;
}
}
}
/* Print content of DWARF .debug_aranges section. We fortunately do
not have to know a bit about the structure of the section, libdwarf
takes care of it. */
static void
print_decoded_aranges_section (Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn,
GElf_Shdr *shdr, Dwarf *dbg)
{
Dwarf_Aranges *aranges;
size_t cnt;
if (unlikely (dwarf_getaranges (dbg, &aranges, &cnt) != 0))
{
error (0, 0, gettext ("cannot get .debug_aranges content: %s"),
dwarf_errmsg (-1));
return;
}
GElf_Shdr glink_mem;
GElf_Shdr *glink;
glink = gelf_getshdr (elf_getscn (ebl->elf, shdr->sh_link), &glink_mem);
if (glink == NULL)
{
error (0, 0, gettext ("invalid sh_link value in section %zu"),
elf_ndxscn (scn));
return;
}
printf (ngettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 " contains %zu entry:\n",
"\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 " contains %zu entries:\n",
cnt),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset, cnt);
/* Compute floor(log16(cnt)). */
size_t tmp = cnt;
int digits = 1;
while (tmp >= 16)
{
++digits;
tmp >>= 4;
}
for (size_t n = 0; n < cnt; ++n)
{
Dwarf_Arange *runp = dwarf_onearange (aranges, n);
if (unlikely (runp == NULL))
{
printf ("cannot get arange %zu: %s\n", n, dwarf_errmsg (-1));
return;
}
Dwarf_Addr start;
Dwarf_Word length;
Dwarf_Off offset;
if (unlikely (dwarf_getarangeinfo (runp, &start, &length, &offset) != 0))
printf (gettext (" [%*zu] ???\n"), digits, n);
else
printf (gettext (" [%*zu] start: %0#*" PRIx64
", length: %5" PRIu64 ", CU DIE offset: %6"
PRId64 "\n"),
digits, n, ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 10 : 18,
(uint64_t) start, (uint64_t) length, (int64_t) offset);
}
}
/* Print content of DWARF .debug_aranges section. */
static void
print_debug_aranges_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl, GElf_Ehdr *ehdr, Elf_Scn *scn,
GElf_Shdr *shdr, Dwarf *dbg)
{
if (decodedaranges)
{
print_decoded_aranges_section (ebl, ehdr, scn, shdr, dbg);
return;
}
Elf_Data *data = dbg->sectiondata[IDX_debug_aranges];
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get .debug_aranges content: %s"),
elf_errmsg (-1));
return;
}
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
const unsigned char *readp = data->d_buf;
const unsigned char *readendp = readp + data->d_size;
while (readp < readendp)
{
const unsigned char *hdrstart = readp;
size_t start_offset = hdrstart - (const unsigned char *) data->d_buf;
printf (gettext ("\nTable at offset %zu:\n"), start_offset);
if (readp + 4 > readendp)
{
invalid_data:
error (0, 0, gettext ("invalid data in section [%zu] '%s'"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr));
return;
}
Dwarf_Word length = read_4ubyte_unaligned_inc (dbg, readp);
unsigned int length_bytes = 4;
if (length == DWARF3_LENGTH_64_BIT)
{
if (readp + 8 > readendp)
goto invalid_data;
length = read_8ubyte_unaligned_inc (dbg, readp);
length_bytes = 8;
}
const unsigned char *nexthdr = readp + length;
printf (gettext ("\n Length: %6" PRIu64 "\n"),
(uint64_t) length);
if (unlikely (length > (size_t) (readendp - readp)))
goto invalid_data;
if (length == 0)
continue;
if (readp + 2 > readendp)
goto invalid_data;
uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, readp);
printf (gettext (" DWARF version: %6" PRIuFAST16 "\n"),
version);
if (version != 2)
{
error (0, 0, gettext ("unsupported aranges version"));
goto next_table;
}
Dwarf_Word offset;
if (readp + length_bytes > readendp)
goto invalid_data;
if (length_bytes == 8)
offset = read_8ubyte_unaligned_inc (dbg, readp);
else
offset = read_4ubyte_unaligned_inc (dbg, readp);
printf (gettext (" CU offset: %6" PRIx64 "\n"),
(uint64_t) offset);
if (readp + 1 > readendp)
goto invalid_data;
unsigned int address_size = *readp++;
printf (gettext (" Address size: %6" PRIu64 "\n"),
(uint64_t) address_size);
if (address_size != 4 && address_size != 8)
{
error (0, 0, gettext ("unsupported address size"));
goto next_table;
}
unsigned int segment_size = *readp++;
printf (gettext (" Segment size: %6" PRIu64 "\n\n"),
(uint64_t) segment_size);
if (segment_size != 0 && segment_size != 4 && segment_size != 8)
{
error (0, 0, gettext ("unsupported segment size"));
goto next_table;
}
/* Round the address to the next multiple of 2*address_size. */
readp += ((2 * address_size - ((readp - hdrstart) % (2 * address_size)))
% (2 * address_size));
while (readp < nexthdr)
{
Dwarf_Word range_address;
Dwarf_Word range_length;
Dwarf_Word segment = 0;
if (readp + 2 * address_size + segment_size > readendp)
goto invalid_data;
if (address_size == 4)
{
range_address = read_4ubyte_unaligned_inc (dbg, readp);
range_length = read_4ubyte_unaligned_inc (dbg, readp);
}
else
{
range_address = read_8ubyte_unaligned_inc (dbg, readp);
range_length = read_8ubyte_unaligned_inc (dbg, readp);
}
if (segment_size == 4)
segment = read_4ubyte_unaligned_inc (dbg, readp);
else if (segment_size == 8)
segment = read_8ubyte_unaligned_inc (dbg, readp);
if (range_address == 0 && range_length == 0 && segment == 0)
break;
char *b = format_dwarf_addr (dwflmod, address_size, range_address,
range_address);
char *e = format_dwarf_addr (dwflmod, address_size,
range_address + range_length - 1,
range_length);
if (segment_size != 0)
printf (gettext (" %s..%s (%" PRIx64 ")\n"), b, e,
(uint64_t) segment);
else
printf (gettext (" %s..%s\n"), b, e);
free (b);
free (e);
}
next_table:
if (readp != nexthdr)
{
size_t padding = nexthdr - readp;
printf (gettext (" %zu padding bytes\n"), padding);
readp = nexthdr;
}
}
}
/* Print content of DWARF .debug_ranges section. */
static void
print_debug_ranges_section (Dwfl_Module *dwflmod,
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr,
Dwarf *dbg)
{
Elf_Data *data = dbg->sectiondata[IDX_debug_ranges];
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get .debug_ranges content: %s"),
elf_errmsg (-1));
return;
}
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
sort_listptr (&known_rangelistptr, "rangelistptr");
size_t listptr_idx = 0;
uint_fast8_t address_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8;
bool first = true;
Dwarf_Addr base = 0;
unsigned char *const endp = (unsigned char *) data->d_buf + data->d_size;
unsigned char *readp = data->d_buf;
while (readp < endp)
{
ptrdiff_t offset = readp - (unsigned char *) data->d_buf;
if (first && skip_listptr_hole (&known_rangelistptr, &listptr_idx,
&address_size, NULL, &base, NULL,
offset, &readp, endp))
continue;
if (unlikely (data->d_size - offset < (size_t) address_size * 2))
{
printf (gettext (" [%6tx] <INVALID DATA>\n"), offset);
break;
}
Dwarf_Addr begin;
Dwarf_Addr end;
if (address_size == 8)
{
begin = read_8ubyte_unaligned_inc (dbg, readp);
end = read_8ubyte_unaligned_inc (dbg, readp);
}
else
{
begin = read_4ubyte_unaligned_inc (dbg, readp);
end = read_4ubyte_unaligned_inc (dbg, readp);
if (begin == (Dwarf_Addr) (uint32_t) -1)
begin = (Dwarf_Addr) -1l;
}
if (begin == (Dwarf_Addr) -1l) /* Base address entry. */
{
char *b = format_dwarf_addr (dwflmod, address_size, end, end);
printf (gettext (" [%6tx] base address %s\n"), offset, b);
free (b);
base = end;
}
else if (begin == 0 && end == 0) /* End of list entry. */
{
if (first)
printf (gettext (" [%6tx] empty list\n"), offset);
first = true;
}
else
{
char *b = format_dwarf_addr (dwflmod, address_size, base + begin,
begin);
char *e = format_dwarf_addr (dwflmod, address_size, base + end,
end);
/* We have an address range entry. */
if (first) /* First address range entry in a list. */
printf (gettext (" [%6tx] %s..%s\n"), offset, b, e);
else
printf (gettext (" %s..%s\n"), b, e);
free (b);
free (e);
first = false;
}
}
}
#define REGNAMESZ 16
static const char *
register_info (Ebl *ebl, unsigned int regno, const Ebl_Register_Location *loc,
char name[REGNAMESZ], int *bits, int *type)
{
const char *set;
const char *pfx;
int ignore;
ssize_t n = ebl_register_info (ebl, regno, name, REGNAMESZ, &pfx, &set,
bits ?: &ignore, type ?: &ignore);
if (n <= 0)
{
if (loc != NULL)
snprintf (name, REGNAMESZ, "reg%u", loc->regno);
else
snprintf (name, REGNAMESZ, "??? 0x%x", regno);
if (bits != NULL)
*bits = loc != NULL ? loc->bits : 0;
if (type != NULL)
*type = DW_ATE_unsigned;
set = "??? unrecognized";
}
else
{
if (bits != NULL && *bits <= 0)
*bits = loc != NULL ? loc->bits : 0;
if (type != NULL && *type == DW_ATE_void)
*type = DW_ATE_unsigned;
}
return set;
}
static void
print_cfa_program (const unsigned char *readp, const unsigned char *const endp,
Dwarf_Word vma_base, unsigned int code_align,
int data_align,
unsigned int version, unsigned int ptr_size,
Dwfl_Module *dwflmod, Ebl *ebl, Dwarf *dbg)
{
char regnamebuf[REGNAMESZ];
const char *regname (unsigned int regno)
{
register_info (ebl, regno, NULL, regnamebuf, NULL, NULL);
return regnamebuf;
}
puts ("\n Program:");
Dwarf_Word pc = vma_base;
while (readp < endp)
{
unsigned int opcode = *readp++;
if (opcode < DW_CFA_advance_loc)
/* Extended opcode. */
switch (opcode)
{
uint64_t op1;
int64_t sop1;
uint64_t op2;
int64_t sop2;
case DW_CFA_nop:
puts (" nop");
break;
case DW_CFA_set_loc:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
op1 += vma_base;
printf (" set_loc %" PRIu64 "\n", op1 * code_align);
break;
case DW_CFA_advance_loc1:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
printf (" advance_loc1 %u to %#" PRIx64 "\n",
*readp, pc += *readp * code_align);
++readp;
break;
case DW_CFA_advance_loc2:
if ((uint64_t) (endp - readp) < 2)
goto invalid;
op1 = read_2ubyte_unaligned_inc (dbg, readp);
printf (" advance_loc2 %" PRIu64 " to %#" PRIx64 "\n",
op1, pc += op1 * code_align);
break;
case DW_CFA_advance_loc4:
if ((uint64_t) (endp - readp) < 4)
goto invalid;
op1 = read_4ubyte_unaligned_inc (dbg, readp);
printf (" advance_loc4 %" PRIu64 " to %#" PRIx64 "\n",
op1, pc += op1 * code_align);
break;
case DW_CFA_offset_extended:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op2, readp, endp);
printf (" offset_extended r%" PRIu64 " (%s) at cfa%+" PRId64
"\n",
op1, regname (op1), op2 * data_align);
break;
case DW_CFA_restore_extended:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
printf (" restore_extended r%" PRIu64 " (%s)\n",
op1, regname (op1));
break;
case DW_CFA_undefined:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
printf (" undefined r%" PRIu64 " (%s)\n", op1, regname (op1));
break;
case DW_CFA_same_value:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
printf (" same_value r%" PRIu64 " (%s)\n", op1, regname (op1));
break;
case DW_CFA_register:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op2, readp, endp);
printf (" register r%" PRIu64 " (%s) in r%" PRIu64 " (%s)\n",
op1, regname (op1), op2, regname (op2));
break;
case DW_CFA_remember_state:
puts (" remember_state");
break;
case DW_CFA_restore_state:
puts (" restore_state");
break;
case DW_CFA_def_cfa:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op2, readp, endp);
printf (" def_cfa r%" PRIu64 " (%s) at offset %" PRIu64 "\n",
op1, regname (op1), op2);
break;
case DW_CFA_def_cfa_register:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
printf (" def_cfa_register r%" PRIu64 " (%s)\n",
op1, regname (op1));
break;
case DW_CFA_def_cfa_offset:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
printf (" def_cfa_offset %" PRIu64 "\n", op1);
break;
case DW_CFA_def_cfa_expression:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp); /* Length of DW_FORM_block. */
printf (" def_cfa_expression %" PRIu64 "\n", op1);
if ((uint64_t) (endp - readp) < op1)
{
invalid:
fputs (gettext (" <INVALID DATA>\n"), stdout);
return;
}
print_ops (dwflmod, dbg, 10, 10, version, ptr_size, 0, NULL,
op1, readp);
readp += op1;
break;
case DW_CFA_expression:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op2, readp, endp); /* Length of DW_FORM_block. */
printf (" expression r%" PRIu64 " (%s) \n",
op1, regname (op1));
if ((uint64_t) (endp - readp) < op2)
goto invalid;
print_ops (dwflmod, dbg, 10, 10, version, ptr_size, 0, NULL,
op2, readp);
readp += op2;
break;
case DW_CFA_offset_extended_sf:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_sleb128 (sop2, readp, endp);
printf (" offset_extended_sf r%" PRIu64 " (%s) at cfa%+"
PRId64 "\n",
op1, regname (op1), sop2 * data_align);
break;
case DW_CFA_def_cfa_sf:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_sleb128 (sop2, readp, endp);
printf (" def_cfa_sf r%" PRIu64 " (%s) at offset %" PRId64 "\n",
op1, regname (op1), sop2 * data_align);
break;
case DW_CFA_def_cfa_offset_sf:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_sleb128 (sop1, readp, endp);
printf (" def_cfa_offset_sf %" PRId64 "\n", sop1 * data_align);
break;
case DW_CFA_val_offset:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op2, readp, endp);
printf (" val_offset %" PRIu64 " at offset %" PRIu64 "\n",
op1, op2 * data_align);
break;
case DW_CFA_val_offset_sf:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_sleb128 (sop2, readp, endp);
printf (" val_offset_sf %" PRIu64 " at offset %" PRId64 "\n",
op1, sop2 * data_align);
break;
case DW_CFA_val_expression:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op2, readp, endp); /* Length of DW_FORM_block. */
printf (" val_expression r%" PRIu64 " (%s)\n",
op1, regname (op1));
if ((uint64_t) (endp - readp) < op2)
goto invalid;
print_ops (dwflmod, dbg, 10, 10, version, ptr_size, 0,
NULL, op2, readp);
readp += op2;
break;
case DW_CFA_MIPS_advance_loc8:
if ((uint64_t) (endp - readp) < 8)
goto invalid;
op1 = read_8ubyte_unaligned_inc (dbg, readp);
printf (" MIPS_advance_loc8 %" PRIu64 " to %#" PRIx64 "\n",
op1, pc += op1 * code_align);
break;
case DW_CFA_GNU_window_save:
puts (" GNU_window_save");
break;
case DW_CFA_GNU_args_size:
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (op1, readp, endp);
printf (" args_size %" PRIu64 "\n", op1);
break;
default:
printf (" ??? (%u)\n", opcode);
break;
}
else if (opcode < DW_CFA_offset)
printf (" advance_loc %u to %#" PRIx64 "\n",
opcode & 0x3f, pc += (opcode & 0x3f) * code_align);
else if (opcode < DW_CFA_restore)
{
uint64_t offset;
if ((uint64_t) (endp - readp) < 1)
goto invalid;
get_uleb128 (offset, readp, endp);
printf (" offset r%u (%s) at cfa%+" PRId64 "\n",
opcode & 0x3f, regname (opcode & 0x3f), offset * data_align);
}
else
printf (" restore r%u (%s)\n",
opcode & 0x3f, regname (opcode & 0x3f));
}
}
static unsigned int
encoded_ptr_size (int encoding, unsigned int ptr_size)
{
switch (encoding & 7)
{
case DW_EH_PE_udata4:
return 4;
case DW_EH_PE_udata8:
return 8;
case 0:
return ptr_size;
}
fprintf (stderr, "Unsupported pointer encoding: %#x, "
"assuming pointer size of %d.\n", encoding, ptr_size);
return ptr_size;
}
static unsigned int
print_encoding (unsigned int val)
{
switch (val & 0xf)
{
case DW_EH_PE_absptr:
fputs ("absptr", stdout);
break;
case DW_EH_PE_uleb128:
fputs ("uleb128", stdout);
break;
case DW_EH_PE_udata2:
fputs ("udata2", stdout);
break;
case DW_EH_PE_udata4:
fputs ("udata4", stdout);
break;
case DW_EH_PE_udata8:
fputs ("udata8", stdout);
break;
case DW_EH_PE_sleb128:
fputs ("sleb128", stdout);
break;
case DW_EH_PE_sdata2:
fputs ("sdata2", stdout);
break;
case DW_EH_PE_sdata4:
fputs ("sdata4", stdout);
break;
case DW_EH_PE_sdata8:
fputs ("sdata8", stdout);
break;
default:
/* We did not use any of the bits after all. */
return val;
}
return val & ~0xf;
}
static unsigned int
print_relinfo (unsigned int val)
{
switch (val & 0x70)
{
case DW_EH_PE_pcrel:
fputs ("pcrel", stdout);
break;
case DW_EH_PE_textrel:
fputs ("textrel", stdout);
break;
case DW_EH_PE_datarel:
fputs ("datarel", stdout);
break;
case DW_EH_PE_funcrel:
fputs ("funcrel", stdout);
break;
case DW_EH_PE_aligned:
fputs ("aligned", stdout);
break;
default:
return val;
}
return val & ~0x70;
}
static void
print_encoding_base (const char *pfx, unsigned int fde_encoding)
{
printf ("(%s", pfx);
if (fde_encoding == DW_EH_PE_omit)
puts ("omit)");
else
{
unsigned int w = fde_encoding;
w = print_encoding (w);
if (w & 0x70)
{
if (w != fde_encoding)
fputc_unlocked (' ', stdout);
w = print_relinfo (w);
}
if (w != 0)
printf ("%s%x", w != fde_encoding ? " " : "", w);
puts (")");
}
}
static const unsigned char *
read_encoded (unsigned int encoding, const unsigned char *readp,
const unsigned char *const endp, uint64_t *res, Dwarf *dbg)
{
if ((encoding & 0xf) == DW_EH_PE_absptr)
encoding = gelf_getclass (dbg->elf) == ELFCLASS32
? DW_EH_PE_udata4 : DW_EH_PE_udata8;
switch (encoding & 0xf)
{
case DW_EH_PE_uleb128:
get_uleb128 (*res, readp, endp);
break;
case DW_EH_PE_sleb128:
get_sleb128 (*res, readp, endp);
break;
case DW_EH_PE_udata2:
if (readp + 2 > endp)
goto invalid;
*res = read_2ubyte_unaligned_inc (dbg, readp);
break;
case DW_EH_PE_udata4:
if (readp + 4 > endp)
goto invalid;
*res = read_4ubyte_unaligned_inc (dbg, readp);
break;
case DW_EH_PE_udata8:
if (readp + 8 > endp)
goto invalid;
*res = read_8ubyte_unaligned_inc (dbg, readp);
break;
case DW_EH_PE_sdata2:
if (readp + 2 > endp)
goto invalid;
*res = read_2sbyte_unaligned_inc (dbg, readp);
break;
case DW_EH_PE_sdata4:
if (readp + 4 > endp)
goto invalid;
*res = read_4sbyte_unaligned_inc (dbg, readp);
break;
case DW_EH_PE_sdata8:
if (readp + 8 > endp)
goto invalid;
*res = read_8sbyte_unaligned_inc (dbg, readp);
break;
default:
invalid:
error (1, 0,
gettext ("invalid encoding"));
}
return readp;
}
static void
print_debug_frame_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
size_t shstrndx;
/* We know this call will succeed since it did in the caller. */
(void) elf_getshdrstrndx (ebl->elf, &shstrndx);
const char *scnname = elf_strptr (ebl->elf, shstrndx, shdr->sh_name);
/* Needed if we find PC-relative addresses. */
GElf_Addr bias;
if (dwfl_module_getelf (dwflmod, &bias) == NULL)
{
error (0, 0, gettext ("cannot get ELF: %s"), dwfl_errmsg (-1));
return;
}
bool is_eh_frame = strcmp (scnname, ".eh_frame") == 0;
Elf_Data *data = (is_eh_frame
? elf_rawdata (scn, NULL)
: dbg->sectiondata[IDX_debug_frame]);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get %s content: %s"),
scnname, elf_errmsg (-1));
return;
}
if (is_eh_frame)
printf (gettext ("\
\nCall frame information section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), scnname, (uint64_t) shdr->sh_offset);
else
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), scnname, (uint64_t) shdr->sh_offset);
struct cieinfo
{
ptrdiff_t cie_offset;
const char *augmentation;
unsigned int code_alignment_factor;
unsigned int data_alignment_factor;
uint8_t address_size;
uint8_t fde_encoding;
uint8_t lsda_encoding;
struct cieinfo *next;
} *cies = NULL;
const unsigned char *readp = data->d_buf;
const unsigned char *const dataend = ((unsigned char *) data->d_buf
+ data->d_size);
while (readp < dataend)
{
if (unlikely (readp + 4 > dataend))
{
invalid_data:
error (0, 0, gettext ("invalid data in section [%zu] '%s'"),
elf_ndxscn (scn), scnname);
return;
}
/* At the beginning there must be a CIE. There can be multiple,
hence we test tis in a loop. */
ptrdiff_t offset = readp - (unsigned char *) data->d_buf;
Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, readp);
unsigned int length = 4;
if (unlikely (unit_length == 0xffffffff))
{
if (unlikely (readp + 8 > dataend))
goto invalid_data;
unit_length = read_8ubyte_unaligned_inc (dbg, readp);
length = 8;
}
if (unlikely (unit_length == 0))
{
printf (gettext ("\n [%6tx] Zero terminator\n"), offset);
continue;
}
Dwarf_Word maxsize = dataend - readp;
if (unlikely (unit_length > maxsize))
goto invalid_data;
unsigned int ptr_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8;
ptrdiff_t start = readp - (unsigned char *) data->d_buf;
const unsigned char *const cieend = readp + unit_length;
if (unlikely (cieend > dataend || readp + 8 > dataend))
goto invalid_data;
Dwarf_Off cie_id;
if (length == 4)
{
cie_id = read_4ubyte_unaligned_inc (dbg, readp);
if (!is_eh_frame && cie_id == DW_CIE_ID_32)
cie_id = DW_CIE_ID_64;
}
else
cie_id = read_8ubyte_unaligned_inc (dbg, readp);
uint_fast8_t version = 2;
unsigned int code_alignment_factor;
int data_alignment_factor;
unsigned int fde_encoding = 0;
unsigned int lsda_encoding = 0;
Dwarf_Word initial_location = 0;
Dwarf_Word vma_base = 0;
if (cie_id == (is_eh_frame ? 0 : DW_CIE_ID_64))
{
version = *readp++;
const char *const augmentation = (const char *) readp;
readp = memchr (readp, '\0', cieend - readp);
if (unlikely (readp == NULL))
goto invalid_data;
++readp;
uint_fast8_t segment_size = 0;
if (version >= 4)
{
if (cieend - readp < 5)
goto invalid_data;
ptr_size = *readp++;
segment_size = *readp++;
}
if (cieend - readp < 1)
goto invalid_data;
get_uleb128 (code_alignment_factor, readp, cieend);
if (cieend - readp < 1)
goto invalid_data;
get_sleb128 (data_alignment_factor, readp, cieend);
/* In some variant for unwind data there is another field. */
if (strcmp (augmentation, "eh") == 0)
readp += ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8;
unsigned int return_address_register;
if (cieend - readp < 1)
goto invalid_data;
if (unlikely (version == 1))
return_address_register = *readp++;
else
get_uleb128 (return_address_register, readp, cieend);
printf ("\n [%6tx] CIE length=%" PRIu64 "\n"
" CIE_id: %" PRIu64 "\n"
" version: %u\n"
" augmentation: \"%s\"\n",
offset, (uint64_t) unit_length, (uint64_t) cie_id,
version, augmentation);
if (version >= 4)
printf (" address_size: %u\n"
" segment_size: %u\n",
ptr_size, segment_size);
printf (" code_alignment_factor: %u\n"
" data_alignment_factor: %d\n"
" return_address_register: %u\n",
code_alignment_factor,
data_alignment_factor, return_address_register);
if (augmentation[0] == 'z')
{
unsigned int augmentationlen;
get_uleb128 (augmentationlen, readp, cieend);
if (augmentationlen > (size_t) (cieend - readp))
{
error (0, 0, gettext ("invalid augmentation length"));
readp = cieend;
continue;
}
const char *hdr = "Augmentation data:";
const char *cp = augmentation + 1;
while (*cp != '\0' && cp < augmentation + augmentationlen + 1)
{
printf (" %-26s%#x ", hdr, *readp);
hdr = "";
if (*cp == 'R')
{
fde_encoding = *readp++;
print_encoding_base (gettext ("FDE address encoding: "),
fde_encoding);
}
else if (*cp == 'L')
{
lsda_encoding = *readp++;
print_encoding_base (gettext ("LSDA pointer encoding: "),
lsda_encoding);
}
else if (*cp == 'P')
{
/* Personality. This field usually has a relocation
attached pointing to __gcc_personality_v0. */
const unsigned char *startp = readp;
unsigned int encoding = *readp++;
uint64_t val = 0;
readp = read_encoded (encoding, readp,
readp - 1 + augmentationlen,
&val, dbg);
while (++startp < readp)
printf ("%#x ", *startp);
putchar ('(');
print_encoding (encoding);
putchar (' ');
switch (encoding & 0xf)
{
case DW_EH_PE_sleb128:
case DW_EH_PE_sdata2:
case DW_EH_PE_sdata4:
printf ("%" PRId64 ")\n", val);
break;
default:
printf ("%#" PRIx64 ")\n", val);
break;
}
}
else
printf ("(%x)\n", *readp++);
++cp;
}
}
if (likely (ptr_size == 4 || ptr_size == 8))
{
struct cieinfo *newp = alloca (sizeof (*newp));
newp->cie_offset = offset;
newp->augmentation = augmentation;
newp->fde_encoding = fde_encoding;
newp->lsda_encoding = lsda_encoding;
newp->address_size = ptr_size;
newp->code_alignment_factor = code_alignment_factor;
newp->data_alignment_factor = data_alignment_factor;
newp->next = cies;
cies = newp;
}
}
else
{
struct cieinfo *cie = cies;
while (cie != NULL)
if (is_eh_frame
? ((Dwarf_Off) start - cie_id) == (Dwarf_Off) cie->cie_offset
: cie_id == (Dwarf_Off) cie->cie_offset)
break;
else
cie = cie->next;
if (unlikely (cie == NULL))
{
puts ("invalid CIE reference in FDE");
return;
}
/* Initialize from CIE data. */
fde_encoding = cie->fde_encoding;
lsda_encoding = cie->lsda_encoding;
ptr_size = encoded_ptr_size (fde_encoding, cie->address_size);
code_alignment_factor = cie->code_alignment_factor;
data_alignment_factor = cie->data_alignment_factor;
const unsigned char *base = readp;
// XXX There are sometimes relocations for this value
initial_location = read_addr_unaligned_inc (ptr_size, dbg, readp);
Dwarf_Word address_range
= read_addr_unaligned_inc (ptr_size, dbg, readp);
/* pcrel for an FDE address is relative to the runtime
address of the start_address field itself. Sign extend
if necessary to make sure the calculation is done on the
full 64 bit address even when initial_location only holds
the lower 32 bits. */
Dwarf_Addr pc_start = initial_location;
if (ptr_size == 4)
pc_start = (uint64_t) (int32_t) pc_start;
if ((fde_encoding & 0x70) == DW_EH_PE_pcrel)
pc_start += ((uint64_t) shdr->sh_addr
+ (base - (const unsigned char *) data->d_buf)
- bias);
char *a = format_dwarf_addr (dwflmod, cie->address_size,
pc_start, initial_location);
printf ("\n [%6tx] FDE length=%" PRIu64 " cie=[%6tx]\n"
" CIE_pointer: %" PRIu64 "\n"
" initial_location: %s",
offset, (uint64_t) unit_length,
cie->cie_offset, (uint64_t) cie_id, a);
free (a);
if ((fde_encoding & 0x70) == DW_EH_PE_pcrel)
{
vma_base = (((uint64_t) shdr->sh_offset
+ (base - (const unsigned char *) data->d_buf)
+ (uint64_t) initial_location)
& (ptr_size == 4
? UINT64_C (0xffffffff)
: UINT64_C (0xffffffffffffffff)));
printf (gettext (" (offset: %#" PRIx64 ")"),
(uint64_t) vma_base);
}
printf ("\n address_range: %#" PRIx64,
(uint64_t) address_range);
if ((fde_encoding & 0x70) == DW_EH_PE_pcrel)
printf (gettext (" (end offset: %#" PRIx64 ")"),
((uint64_t) vma_base + (uint64_t) address_range)
& (ptr_size == 4
? UINT64_C (0xffffffff)
: UINT64_C (0xffffffffffffffff)));
putchar ('\n');
if (cie->augmentation[0] == 'z')
{
unsigned int augmentationlen;
if (cieend - readp < 1)
goto invalid_data;
get_uleb128 (augmentationlen, readp, cieend);
if (augmentationlen > (size_t) (cieend - readp))
{
error (0, 0, gettext ("invalid augmentation length"));
readp = cieend;
continue;
}
if (augmentationlen > 0)
{
const char *hdr = "Augmentation data:";
const char *cp = cie->augmentation + 1;
unsigned int u = 0;
while (*cp != '\0'
&& cp < cie->augmentation + augmentationlen + 1)
{
if (*cp == 'L')
{
uint64_t lsda_pointer;
const unsigned char *p
= read_encoded (lsda_encoding, &readp[u],
&readp[augmentationlen],
&lsda_pointer, dbg);
u = p - readp;
printf (gettext ("\
%-26sLSDA pointer: %#" PRIx64 "\n"),
hdr, lsda_pointer);
hdr = "";
}
++cp;
}
while (u < augmentationlen)
{
printf (" %-26s%#x\n", hdr, readp[u++]);
hdr = "";
}
}
readp += augmentationlen;
}
}
/* Handle the initialization instructions. */
if (ptr_size != 4 && ptr_size !=8)
printf ("invalid CIE pointer size (%u), must be 4 or 8.\n", ptr_size);
else
print_cfa_program (readp, cieend, vma_base, code_alignment_factor,
data_alignment_factor, version, ptr_size,
dwflmod, ebl, dbg);
readp = cieend;
}
}
struct attrcb_args
{
Dwfl_Module *dwflmod;
Dwarf *dbg;
Dwarf_Die *die;
int level;
bool silent;
unsigned int version;
unsigned int addrsize;
unsigned int offset_size;
struct Dwarf_CU *cu;
};
static int
attr_callback (Dwarf_Attribute *attrp, void *arg)
{
struct attrcb_args *cbargs = (struct attrcb_args *) arg;
const int level = cbargs->level;
unsigned int attr = dwarf_whatattr (attrp);
if (unlikely (attr == 0))
{
if (!cbargs->silent)
error (0, 0, gettext ("cannot get attribute code: %s"),
dwarf_errmsg (-1));
return DWARF_CB_ABORT;
}
unsigned int form = dwarf_whatform (attrp);
if (unlikely (form == 0))
{
if (!cbargs->silent)
error (0, 0, gettext ("cannot get attribute form: %s"),
dwarf_errmsg (-1));
return DWARF_CB_ABORT;
}
switch (form)
{
case DW_FORM_addr:
if (!cbargs->silent)
{
Dwarf_Addr addr;
if (unlikely (dwarf_formaddr (attrp, &addr) != 0))
{
attrval_out:
if (!cbargs->silent)
error (0, 0, gettext ("cannot get attribute value: %s"),
dwarf_errmsg (-1));
return DWARF_CB_ABORT;
}
char *a = format_dwarf_addr (cbargs->dwflmod, cbargs->addrsize,
addr, addr);
printf (" %*s%-20s (%s) %s\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), a);
free (a);
}
break;
case DW_FORM_indirect:
case DW_FORM_strp:
case DW_FORM_string:
case DW_FORM_GNU_strp_alt:
if (cbargs->silent)
break;
const char *str = dwarf_formstring (attrp);
if (unlikely (str == NULL))
goto attrval_out;
printf (" %*s%-20s (%s) \"%s\"\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), str);
break;
case DW_FORM_ref_addr:
case DW_FORM_ref_udata:
case DW_FORM_ref8:
case DW_FORM_ref4:
case DW_FORM_ref2:
case DW_FORM_ref1:
case DW_FORM_GNU_ref_alt:
if (cbargs->silent)
break;
Dwarf_Die ref;
if (unlikely (dwarf_formref_die (attrp, &ref) == NULL))
goto attrval_out;
printf (" %*s%-20s (%s) [%6" PRIxMAX "]\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), (uintmax_t) dwarf_dieoffset (&ref));
break;
case DW_FORM_ref_sig8:
if (cbargs->silent)
break;
printf (" %*s%-20s (%s) {%6" PRIx64 "}\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form),
(uint64_t) read_8ubyte_unaligned (attrp->cu->dbg, attrp->valp));
break;
case DW_FORM_sec_offset:
case DW_FORM_udata:
case DW_FORM_sdata:
case DW_FORM_data8:
case DW_FORM_data4:
case DW_FORM_data2:
case DW_FORM_data1:;
Dwarf_Word num;
if (unlikely (dwarf_formudata (attrp, &num) != 0))
goto attrval_out;
const char *valuestr = NULL;
switch (attr)
{
/* This case can take either a constant or a loclistptr. */
case DW_AT_data_member_location:
if (form != DW_FORM_sec_offset
&& (cbargs->version >= 4
|| (form != DW_FORM_data4 && form != DW_FORM_data8)))
{
if (!cbargs->silent)
printf (" %*s%-20s (%s) %" PRIxMAX "\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), (uintmax_t) num);
return DWARF_CB_OK;
}
/* else fallthrough */
/* These cases always take a loclistptr and no constant. */
case DW_AT_location:
case DW_AT_data_location:
case DW_AT_vtable_elem_location:
case DW_AT_string_length:
case DW_AT_use_location:
case DW_AT_frame_base:
case DW_AT_return_addr:
case DW_AT_static_link:
case DW_AT_GNU_call_site_value:
case DW_AT_GNU_call_site_data_value:
case DW_AT_GNU_call_site_target:
case DW_AT_GNU_call_site_target_clobbered:
{
bool nlpt = notice_listptr (section_loc, &known_loclistptr,
cbargs->addrsize, cbargs->offset_size,
cbargs->cu, num);
if (!cbargs->silent)
printf (" %*s%-20s (%s) location list [%6" PRIxMAX "]%s\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), (uintmax_t) num,
nlpt ? "" : " <WARNING offset too big>");
}
return DWARF_CB_OK;
case DW_AT_ranges:
{
bool nlpt = notice_listptr (section_ranges, &known_rangelistptr,
cbargs->addrsize, cbargs->offset_size,
cbargs->cu, num);
if (!cbargs->silent)
printf (" %*s%-20s (%s) range list [%6" PRIxMAX "]%s\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), (uintmax_t) num,
nlpt ? "" : " <WARNING offset too big>");
}
return DWARF_CB_OK;
case DW_AT_language:
valuestr = dwarf_lang_name (num);
break;
case DW_AT_encoding:
valuestr = dwarf_encoding_name (num);
break;
case DW_AT_accessibility:
valuestr = dwarf_access_name (num);
break;
case DW_AT_visibility:
valuestr = dwarf_visibility_name (num);
break;
case DW_AT_virtuality:
valuestr = dwarf_virtuality_name (num);
break;
case DW_AT_identifier_case:
valuestr = dwarf_identifier_case_name (num);
break;
case DW_AT_calling_convention:
valuestr = dwarf_calling_convention_name (num);
break;
case DW_AT_inline:
valuestr = dwarf_inline_name (num);
break;
case DW_AT_ordering:
valuestr = dwarf_ordering_name (num);
break;
case DW_AT_discr_list:
valuestr = dwarf_discr_list_name (num);
break;
default:
/* Nothing. */
break;
}
if (cbargs->silent)
break;
/* When highpc is in constant form it is relative to lowpc.
In that case also show the address. */
Dwarf_Addr highpc;
if (attr == DW_AT_high_pc && dwarf_highpc (cbargs->die, &highpc) == 0)
{
char *a = format_dwarf_addr (cbargs->dwflmod, cbargs->addrsize,
highpc, highpc);
printf (" %*s%-20s (%s) %" PRIuMAX " (%s)\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), (uintmax_t) num, a);
free (a);
}
else
{
Dwarf_Sword snum = 0;
if (form == DW_FORM_sdata)
if (unlikely (dwarf_formsdata (attrp, &snum) != 0))
goto attrval_out;
if (valuestr == NULL)
{
printf (" %*s%-20s (%s)",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form));
if (form == DW_FORM_sdata)
printf (" %" PRIdMAX "\n", (intmax_t) snum);
else
printf (" %" PRIuMAX "\n", (uintmax_t) num);
}
else
{
printf (" %*s%-20s (%s) %s",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), valuestr);
if (form == DW_FORM_sdata)
printf (" (%" PRIdMAX ")\n", (intmax_t) snum);
else
printf (" (%" PRIuMAX ")\n", (uintmax_t) num);
}
}
break;
case DW_FORM_flag:
if (cbargs->silent)
break;
bool flag;
if (unlikely (dwarf_formflag (attrp, &flag) != 0))
goto attrval_out;
printf (" %*s%-20s (%s) %s\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), nl_langinfo (flag ? YESSTR : NOSTR));
break;
case DW_FORM_flag_present:
if (cbargs->silent)
break;
printf (" %*s%-20s (%s) %s\n",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form), nl_langinfo (YESSTR));
break;
case DW_FORM_exprloc:
case DW_FORM_block4:
case DW_FORM_block2:
case DW_FORM_block1:
case DW_FORM_block:
if (cbargs->silent)
break;
Dwarf_Block block;
if (unlikely (dwarf_formblock (attrp, &block) != 0))
goto attrval_out;
printf (" %*s%-20s (%s) ",
(int) (level * 2), "", dwarf_attr_name (attr),
dwarf_form_name (form));
switch (attr)
{
default:
if (form != DW_FORM_exprloc)
{
print_block (block.length, block.data);
break;
}
/* Fall through. */
case DW_AT_location:
case DW_AT_data_location:
case DW_AT_data_member_location:
case DW_AT_vtable_elem_location:
case DW_AT_string_length:
case DW_AT_use_location:
case DW_AT_frame_base:
case DW_AT_return_addr:
case DW_AT_static_link:
case DW_AT_allocated:
case DW_AT_associated:
case DW_AT_bit_size:
case DW_AT_bit_offset:
case DW_AT_bit_stride:
case DW_AT_byte_size:
case DW_AT_byte_stride:
case DW_AT_count:
case DW_AT_lower_bound:
case DW_AT_upper_bound:
case DW_AT_GNU_call_site_value:
case DW_AT_GNU_call_site_data_value:
case DW_AT_GNU_call_site_target:
case DW_AT_GNU_call_site_target_clobbered:
putchar ('\n');
print_ops (cbargs->dwflmod, cbargs->dbg,
12 + level * 2, 12 + level * 2,
cbargs->version, cbargs->addrsize, cbargs->offset_size,
attrp->cu, block.length, block.data);
break;
}
break;
default:
if (cbargs->silent)
break;
printf (" %*s%-20s (form: %#x) ???\n",
(int) (level * 2), "", dwarf_attr_name (attr),
(int) form);
break;
}
return DWARF_CB_OK;
}
static void
print_debug_units (Dwfl_Module *dwflmod,
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr,
Dwarf *dbg, bool debug_types)
{
const bool silent = !(print_debug_sections & section_info);
const char *secname = section_name (ebl, ehdr, shdr);
if (!silent)
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n [Offset]\n"),
elf_ndxscn (scn), secname, (uint64_t) shdr->sh_offset);
/* If the section is empty we don't have to do anything. */
if (!silent && shdr->sh_size == 0)
return;
int maxdies = 20;
Dwarf_Die *dies = (Dwarf_Die *) xmalloc (maxdies * sizeof (Dwarf_Die));
Dwarf_Off offset = 0;
/* New compilation unit. */
size_t cuhl;
Dwarf_Half version;
Dwarf_Off abbroffset;
uint8_t addrsize;
uint8_t offsize;
Dwarf_Off nextcu;
uint64_t typesig;
Dwarf_Off typeoff;
next_cu:
if (dwarf_next_unit (dbg, offset, &nextcu, &cuhl, &version,
&abbroffset, &addrsize, &offsize,
debug_types ? &typesig : NULL,
debug_types ? &typeoff : NULL) != 0)
goto do_return;
if (!silent)
{
if (debug_types)
printf (gettext (" Type unit at offset %" PRIu64 ":\n"
" Version: %" PRIu16 ", Abbreviation section offset: %"
PRIu64 ", Address size: %" PRIu8
", Offset size: %" PRIu8
"\n Type signature: %#" PRIx64
", Type offset: %#" PRIx64 "\n"),
(uint64_t) offset, version, abbroffset, addrsize, offsize,
typesig, (uint64_t) typeoff);
else
printf (gettext (" Compilation unit at offset %" PRIu64 ":\n"
" Version: %" PRIu16 ", Abbreviation section offset: %"
PRIu64 ", Address size: %" PRIu8
", Offset size: %" PRIu8 "\n"),
(uint64_t) offset, version, abbroffset, addrsize, offsize);
}
struct attrcb_args args =
{
.dwflmod = dwflmod,
.dbg = dbg,
.silent = silent,
.version = version,
.addrsize = addrsize,
.offset_size = offsize
};
offset += cuhl;
int level = 0;
if (unlikely ((debug_types ? dwarf_offdie_types : dwarf_offdie)
(dbg, offset, &dies[level]) == NULL))
{
if (!silent)
error (0, 0, gettext ("cannot get DIE at offset %" PRIu64
" in section '%s': %s"),
(uint64_t) offset, secname, dwarf_errmsg (-1));
goto do_return;
}
args.cu = dies[0].cu;
do
{
offset = dwarf_dieoffset (&dies[level]);
if (unlikely (offset == ~0ul))
{
if (!silent)
error (0, 0, gettext ("cannot get DIE offset: %s"),
dwarf_errmsg (-1));
goto do_return;
}
int tag = dwarf_tag (&dies[level]);
if (unlikely (tag == DW_TAG_invalid))
{
if (!silent)
error (0, 0, gettext ("cannot get tag of DIE at offset %" PRIu64
" in section '%s': %s"),
(uint64_t) offset, secname, dwarf_errmsg (-1));
goto do_return;
}
if (!silent)
printf (" [%6" PRIx64 "] %*s%s\n",
(uint64_t) offset, (int) (level * 2), "",
dwarf_tag_name (tag));
/* Print the attribute values. */
args.level = level;
args.die = &dies[level];
(void) dwarf_getattrs (&dies[level], attr_callback, &args, 0);
/* Make room for the next level's DIE. */
if (level + 1 == maxdies)
dies = (Dwarf_Die *) xrealloc (dies,
(maxdies += 10)
* sizeof (Dwarf_Die));
int res = dwarf_child (&dies[level], &dies[level + 1]);
if (res > 0)
{
while ((res = dwarf_siblingof (&dies[level], &dies[level])) == 1)
if (level-- == 0)
break;
if (unlikely (res == -1))
{
if (!silent)
error (0, 0, gettext ("cannot get next DIE: %s\n"),
dwarf_errmsg (-1));
goto do_return;
}
}
else if (unlikely (res < 0))
{
if (!silent)
error (0, 0, gettext ("cannot get next DIE: %s"),
dwarf_errmsg (-1));
goto do_return;
}
else
++level;
}
while (level >= 0);
offset = nextcu;
if (offset != 0)
goto next_cu;
do_return:
free (dies);
}
static void
print_debug_info_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
print_debug_units (dwflmod, ebl, ehdr, scn, shdr, dbg, false);
}
static void
print_debug_types_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
print_debug_units (dwflmod, ebl, ehdr, scn, shdr, dbg, true);
}
static void
print_decoded_line_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
size_t address_size
= elf_getident (ebl->elf, NULL)[EI_CLASS] == ELFCLASS32 ? 4 : 8;
Dwarf_Off cuoffset;
Dwarf_Off ncuoffset = 0;
size_t hsize;
while (dwarf_nextcu (dbg, cuoffset = ncuoffset, &ncuoffset, &hsize,
NULL, NULL, NULL) == 0)
{
Dwarf_Die cudie;
if (dwarf_offdie (dbg, cuoffset + hsize, &cudie) == NULL)
continue;
size_t nlines;
Dwarf_Lines *lines;
if (dwarf_getsrclines (&cudie, &lines, &nlines) != 0)
continue;
printf (" CU [%" PRIx64 "] %s\n",
dwarf_dieoffset (&cudie), dwarf_diename (&cudie));
printf (" line:col SBPE* disc isa op address"
" (Statement Block Prologue Epilogue *End)\n");
const char *last_file = "";
for (size_t n = 0; n < nlines; n++)
{
Dwarf_Line *line = dwarf_onesrcline (lines, n);
if (line == NULL)
{
printf (" dwarf_onesrcline: %s\n", dwarf_errmsg (-1));
continue;
}
Dwarf_Word mtime, length;
const char *file = dwarf_linesrc (line, &mtime, &length);
if (file == NULL)
{
printf (" <%s> (mtime: ?, length: ?)\n", dwarf_errmsg (-1));
last_file = "";
}
else if (strcmp (last_file, file) != 0)
{
printf (" %s (mtime: %" PRIu64 ", length: %" PRIu64 ")\n",
file, mtime, length);
last_file = file;
}
int lineno, colno;
bool statement, endseq, block, prologue_end, epilogue_begin;
unsigned int lineop, isa, disc;
Dwarf_Addr address;
dwarf_lineaddr (line, &address);
dwarf_lineno (line, &lineno);
dwarf_linecol (line, &colno);
dwarf_lineop_index (line, &lineop);
dwarf_linebeginstatement (line, &statement);
dwarf_lineendsequence (line, &endseq);
dwarf_lineblock (line, &block);
dwarf_lineprologueend (line, &prologue_end);
dwarf_lineepiloguebegin (line, &epilogue_begin);
dwarf_lineisa (line, &isa);
dwarf_linediscriminator (line, &disc);
/* End sequence is special, it is one byte past. */
char *a = format_dwarf_addr (dwflmod, address_size,
address - (endseq ? 1 : 0), address);
printf (" %4d:%-3d %c%c%c%c%c %4d %3d %2d %s\n",
lineno, colno,
(statement ? 'S' : ' '),
(block ? 'B' : ' '),
(prologue_end ? 'P' : ' '),
(epilogue_begin ? 'E' : ' '),
(endseq ? '*' : ' '),
disc, isa, lineop, a);
free (a);
if (endseq)
printf("\n");
}
}
}
static void
print_debug_line_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
if (decodedline)
{
print_decoded_line_section (dwflmod, ebl, ehdr, scn, shdr, dbg);
return;
}
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
if (shdr->sh_size == 0)
return;
/* There is no functionality in libdw to read the information in the
way it is represented here. Hardcode the decoder. */
Elf_Data *data = dbg->sectiondata[IDX_debug_line];
if (unlikely (data == NULL || data->d_buf == NULL))
{
error (0, 0, gettext ("cannot get line data section data: %s"),
elf_errmsg (-1));
return;
}
const unsigned char *linep = (const unsigned char *) data->d_buf;
const unsigned char *lineendp;
while (linep
< (lineendp = (const unsigned char *) data->d_buf + data->d_size))
{
size_t start_offset = linep - (const unsigned char *) data->d_buf;
printf (gettext ("\nTable at offset %zu:\n"), start_offset);
if (unlikely (linep + 4 > lineendp))
goto invalid_data;
Dwarf_Word unit_length = read_4ubyte_unaligned_inc (dbg, linep);
unsigned int length = 4;
if (unlikely (unit_length == 0xffffffff))
{
if (unlikely (linep + 8 > lineendp))
{
invalid_data:
error (0, 0, gettext ("invalid data in section [%zu] '%s'"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr));
return;
}
unit_length = read_8ubyte_unaligned_inc (dbg, linep);
length = 8;
}
/* Check whether we have enough room in the section. */
if (unlikely (unit_length > (size_t) (lineendp - linep)
|| unit_length < 2 + length + 5 * 1))
goto invalid_data;
lineendp = linep + unit_length;
/* The next element of the header is the version identifier. */
uint_fast16_t version = read_2ubyte_unaligned_inc (dbg, linep);
/* Next comes the header length. */
Dwarf_Word header_length;
if (length == 4)
header_length = read_4ubyte_unaligned_inc (dbg, linep);
else
header_length = read_8ubyte_unaligned_inc (dbg, linep);
//const unsigned char *header_start = linep;
/* Next the minimum instruction length. */
uint_fast8_t minimum_instr_len = *linep++;
/* Next the maximum operations per instruction, in version 4 format. */
uint_fast8_t max_ops_per_instr = version < 4 ? 1 : *linep++;
/* Then the flag determining the default value of the is_stmt
register. */
uint_fast8_t default_is_stmt = *linep++;
/* Now the line base. */
int_fast8_t line_base = *((const int_fast8_t *) linep);
++linep;
/* And the line range. */
uint_fast8_t line_range = *linep++;
/* The opcode base. */
uint_fast8_t opcode_base = *linep++;
/* Print what we got so far. */
printf (gettext ("\n"
" Length: %" PRIu64 "\n"
" DWARF version: %" PRIuFAST16 "\n"
" Prologue length: %" PRIu64 "\n"
" Minimum instruction length: %" PRIuFAST8 "\n"
" Maximum operations per instruction: %" PRIuFAST8 "\n"
" Initial value if '%s': %" PRIuFAST8 "\n"
" Line base: %" PRIdFAST8 "\n"
" Line range: %" PRIuFAST8 "\n"
" Opcode base: %" PRIuFAST8 "\n"
"\n"
"Opcodes:\n"),
(uint64_t) unit_length, version, (uint64_t) header_length,
minimum_instr_len, max_ops_per_instr,
"is_stmt", default_is_stmt, line_base,
line_range, opcode_base);
if (unlikely (linep + opcode_base - 1 >= lineendp))
{
invalid_unit:
error (0, 0,
gettext ("invalid data at offset %tu in section [%zu] '%s'"),
linep - (const unsigned char *) data->d_buf,
elf_ndxscn (scn), section_name (ebl, ehdr, shdr));
linep = lineendp;
continue;
}
int opcode_base_l10 = 1;
unsigned int tmp = opcode_base;
while (tmp > 10)
{
tmp /= 10;
++opcode_base_l10;
}
const uint8_t *standard_opcode_lengths = linep - 1;
for (uint_fast8_t cnt = 1; cnt < opcode_base; ++cnt)
printf (ngettext (" [%*" PRIuFAST8 "] %hhu argument\n",
" [%*" PRIuFAST8 "] %hhu arguments\n",
(int) linep[cnt - 1]),
opcode_base_l10, cnt, linep[cnt - 1]);
linep += opcode_base - 1;
if (unlikely (linep >= lineendp))
goto invalid_unit;
puts (gettext ("\nDirectory table:"));
while (*linep != 0)
{
unsigned char *endp = memchr (linep, '\0', lineendp - linep);
if (unlikely (endp == NULL))
goto invalid_unit;
printf (" %s\n", (char *) linep);
linep = endp + 1;
}
/* Skip the final NUL byte. */
++linep;
if (unlikely (linep >= lineendp))
goto invalid_unit;
puts (gettext ("\nFile name table:\n"
" Entry Dir Time Size Name"));
for (unsigned int cnt = 1; *linep != 0; ++cnt)
{
/* First comes the file name. */
char *fname = (char *) linep;
unsigned char *endp = memchr (fname, '\0', lineendp - linep);
if (unlikely (endp == NULL))
goto invalid_unit;
linep = endp + 1;
/* Then the index. */
unsigned int diridx;
if (lineendp - linep < 1)
goto invalid_unit;
get_uleb128 (diridx, linep, lineendp);
/* Next comes the modification time. */
unsigned int mtime;
if (lineendp - linep < 1)
goto invalid_unit;
get_uleb128 (mtime, linep, lineendp);
/* Finally the length of the file. */
unsigned int fsize;
if (lineendp - linep < 1)
goto invalid_unit;
get_uleb128 (fsize, linep, lineendp);
printf (" %-5u %-5u %-9u %-9u %s\n",
cnt, diridx, mtime, fsize, fname);
}
/* Skip the final NUL byte. */
++linep;
puts (gettext ("\nLine number statements:"));
Dwarf_Word address = 0;
unsigned int op_index = 0;
size_t line = 1;
uint_fast8_t is_stmt = default_is_stmt;
/* Default address value, in case we do not find the CU. */
size_t address_size
= elf_getident (ebl->elf, NULL)[EI_CLASS] == ELFCLASS32 ? 4 : 8;
/* Determine the CU this block is for. */
Dwarf_Off cuoffset;
Dwarf_Off ncuoffset = 0;
size_t hsize;
while (dwarf_nextcu (dbg, cuoffset = ncuoffset, &ncuoffset, &hsize,
NULL, NULL, NULL) == 0)
{
Dwarf_Die cudie;
if (dwarf_offdie (dbg, cuoffset + hsize, &cudie) == NULL)
continue;
Dwarf_Attribute stmt_list;
if (dwarf_attr (&cudie, DW_AT_stmt_list, &stmt_list) == NULL)
continue;
Dwarf_Word lineoff;
if (dwarf_formudata (&stmt_list, &lineoff) != 0)
continue;
if (lineoff == start_offset)
{
/* Found the CU. */
address_size = cudie.cu->address_size;
break;
}
}
/* Apply the "operation advance" from a special opcode
or DW_LNS_advance_pc (as per DWARF4 6.2.5.1). */
unsigned int op_addr_advance;
bool show_op_index;
inline void advance_pc (unsigned int op_advance)
{
op_addr_advance = minimum_instr_len * ((op_index + op_advance)
/ max_ops_per_instr);
address += op_advance;
show_op_index = (op_index > 0 ||
(op_index + op_advance) % max_ops_per_instr > 0);
op_index = (op_index + op_advance) % max_ops_per_instr;
}
if (max_ops_per_instr == 0)
{
error (0, 0,
gettext ("invalid maximum operations per instruction is zero"));
linep = lineendp;
continue;
}
while (linep < lineendp)
{
size_t offset = linep - (const unsigned char *) data->d_buf;
unsigned int u128;
int s128;
/* Read the opcode. */
unsigned int opcode = *linep++;
printf (" [%6" PRIx64 "]", (uint64_t)offset);
/* Is this a special opcode? */
if (likely (opcode >= opcode_base))
{
if (unlikely (line_range == 0))
goto invalid_unit;
/* Yes. Handling this is quite easy since the opcode value
is computed with
opcode = (desired line increment - line_base)
+ (line_range * address advance) + opcode_base
*/
int line_increment = (line_base
+ (opcode - opcode_base) % line_range);
/* Perform the increments. */
line += line_increment;
advance_pc ((opcode - opcode_base) / line_range);
char *a = format_dwarf_addr (dwflmod, 0, address, address);
if (show_op_index)
printf (gettext ("\
special opcode %u: address+%u = %s, op_index = %u, line%+d = %zu\n"),
opcode, op_addr_advance, a, op_index,
line_increment, line);
else
printf (gettext ("\
special opcode %u: address+%u = %s, line%+d = %zu\n"),
opcode, op_addr_advance, a, line_increment, line);
free (a);
}
else if (opcode == 0)
{
/* This an extended opcode. */
if (unlikely (linep + 2 > lineendp))
goto invalid_unit;
/* The length. */
unsigned int len = *linep++;
if (unlikely (linep + len > lineendp))
goto invalid_unit;
/* The sub-opcode. */
opcode = *linep++;
printf (gettext (" extended opcode %u: "), opcode);
switch (opcode)
{
case DW_LNE_end_sequence:
puts (gettext (" end of sequence"));
/* Reset the registers we care about. */
address = 0;
op_index = 0;
line = 1;
is_stmt = default_is_stmt;
break;
case DW_LNE_set_address:
op_index = 0;
if (unlikely ((size_t) (lineendp - linep) < address_size))
goto invalid_unit;
if (address_size == 4)
address = read_4ubyte_unaligned_inc (dbg, linep);
else
address = read_8ubyte_unaligned_inc (dbg, linep);
{
char *a = format_dwarf_addr (dwflmod, 0, address, address);
printf (gettext (" set address to %s\n"), a);
free (a);
}
break;
case DW_LNE_define_file:
{
char *fname = (char *) linep;
unsigned char *endp = memchr (linep, '\0',
lineendp - linep);
if (unlikely (endp == NULL))
goto invalid_unit;
linep = endp + 1;
unsigned int diridx;
if (lineendp - linep < 1)
goto invalid_unit;
get_uleb128 (diridx, linep, lineendp);
Dwarf_Word mtime;
if (lineendp - linep < 1)
goto invalid_unit;
get_uleb128 (mtime, linep, lineendp);
Dwarf_Word filelength;
if (lineendp - linep < 1)
goto invalid_unit;
get_uleb128 (filelength, linep, lineendp);
printf (gettext ("\
define new file: dir=%u, mtime=%" PRIu64 ", length=%" PRIu64 ", name=%s\n"),
diridx, (uint64_t) mtime, (uint64_t) filelength,
fname);
}
break;
case DW_LNE_set_discriminator:
/* Takes one ULEB128 parameter, the discriminator. */
if (unlikely (standard_opcode_lengths[opcode] != 1))
goto invalid_unit;
get_uleb128 (u128, linep, lineendp);
printf (gettext (" set discriminator to %u\n"), u128);
break;
default:
/* Unknown, ignore it. */
puts (gettext (" unknown opcode"));
linep += len - 1;
break;
}
}
else if (opcode <= DW_LNS_set_isa)
{
/* This is a known standard opcode. */
switch (opcode)
{
case DW_LNS_copy:
/* Takes no argument. */
puts (gettext (" copy"));
break;
case DW_LNS_advance_pc:
/* Takes one uleb128 parameter which is added to the
address. */
get_uleb128 (u128, linep, lineendp);
advance_pc (u128);
{
char *a = format_dwarf_addr (dwflmod, 0, address, address);
if (show_op_index)
printf (gettext ("\
advance address by %u to %s, op_index to %u\n"),
op_addr_advance, a, op_index);
else
printf (gettext (" advance address by %u to %s\n"),
op_addr_advance, a);
free (a);
}
break;
case DW_LNS_advance_line:
/* Takes one sleb128 parameter which is added to the
line. */
get_sleb128 (s128, linep, lineendp);
line += s128;
printf (gettext ("\
advance line by constant %d to %" PRId64 "\n"),
s128, (int64_t) line);
break;
case DW_LNS_set_file:
/* Takes one uleb128 parameter which is stored in file. */
get_uleb128 (u128, linep, lineendp);
printf (gettext (" set file to %" PRIu64 "\n"),
(uint64_t) u128);
break;
case DW_LNS_set_column:
/* Takes one uleb128 parameter which is stored in column. */
if (unlikely (standard_opcode_lengths[opcode] != 1))
goto invalid_unit;
get_uleb128 (u128, linep, lineendp);
printf (gettext (" set column to %" PRIu64 "\n"),
(uint64_t) u128);
break;
case DW_LNS_negate_stmt:
/* Takes no argument. */
is_stmt = 1 - is_stmt;
printf (gettext (" set '%s' to %" PRIuFAST8 "\n"),
"is_stmt", is_stmt);
break;
case DW_LNS_set_basic_block:
/* Takes no argument. */
puts (gettext (" set basic block flag"));
break;
case DW_LNS_const_add_pc:
/* Takes no argument. */
if (unlikely (line_range == 0))
goto invalid_unit;
advance_pc ((255 - opcode_base) / line_range);
{
char *a = format_dwarf_addr (dwflmod, 0, address, address);
if (show_op_index)
printf (gettext ("\
advance address by constant %u to %s, op_index to %u\n"),
op_addr_advance, a, op_index);
else
printf (gettext ("\
advance address by constant %u to %s\n"),
op_addr_advance, a);
free (a);
}
break;
case DW_LNS_fixed_advance_pc:
/* Takes one 16 bit parameter which is added to the
address. */
if (unlikely (standard_opcode_lengths[opcode] != 1))
goto invalid_unit;
u128 = read_2ubyte_unaligned_inc (dbg, linep);
address += u128;
op_index = 0;
{
char *a = format_dwarf_addr (dwflmod, 0, address, address);
printf (gettext ("\
advance address by fixed value %u to %s\n"),
u128, a);
free (a);
}
break;
case DW_LNS_set_prologue_end:
/* Takes no argument. */
puts (gettext (" set prologue end flag"));
break;
case DW_LNS_set_epilogue_begin:
/* Takes no argument. */
puts (gettext (" set epilogue begin flag"));
break;
case DW_LNS_set_isa:
/* Takes one uleb128 parameter which is stored in isa. */
if (unlikely (standard_opcode_lengths[opcode] != 1))
goto invalid_unit;
get_uleb128 (u128, linep, lineendp);
printf (gettext (" set isa to %u\n"), u128);
break;
}
}
else
{
/* This is a new opcode the generator but not we know about.
Read the parameters associated with it but then discard
everything. Read all the parameters for this opcode. */
printf (ngettext (" unknown opcode with %" PRIu8 " parameter:",
" unknown opcode with %" PRIu8 " parameters:",
standard_opcode_lengths[opcode]),
standard_opcode_lengths[opcode]);
for (int n = standard_opcode_lengths[opcode]; n > 0; --n)
{
get_uleb128 (u128, linep, lineendp);
if (n != standard_opcode_lengths[opcode])
putc_unlocked (',', stdout);
printf (" %u", u128);
}
/* Next round, ignore this opcode. */
continue;
}
}
}
/* There must only be one data block. */
assert (elf_getdata (scn, data) == NULL);
}
static void
print_debug_loc_section (Dwfl_Module *dwflmod,
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
Elf_Data *data = dbg->sectiondata[IDX_debug_loc];
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get .debug_loc content: %s"),
elf_errmsg (-1));
return;
}
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
sort_listptr (&known_loclistptr, "loclistptr");
size_t listptr_idx = 0;
uint_fast8_t address_size = ehdr->e_ident[EI_CLASS] == ELFCLASS32 ? 4 : 8;
uint_fast8_t offset_size = 4;
bool first = true;
struct Dwarf_CU *cu = NULL;
Dwarf_Addr base = 0;
unsigned char *readp = data->d_buf;
unsigned char *const endp = (unsigned char *) data->d_buf + data->d_size;
while (readp < endp)
{
ptrdiff_t offset = readp - (unsigned char *) data->d_buf;
if (first && skip_listptr_hole (&known_loclistptr, &listptr_idx,
&address_size, &offset_size, &base,
&cu, offset, &readp, endp))
continue;
if (unlikely (data->d_size - offset < (size_t) address_size * 2))
{
printf (gettext (" [%6tx] <INVALID DATA>\n"), offset);
break;
}
Dwarf_Addr begin;
Dwarf_Addr end;
if (address_size == 8)
{
begin = read_8ubyte_unaligned_inc (dbg, readp);
end = read_8ubyte_unaligned_inc (dbg, readp);
}
else
{
begin = read_4ubyte_unaligned_inc (dbg, readp);
end = read_4ubyte_unaligned_inc (dbg, readp);
if (begin == (Dwarf_Addr) (uint32_t) -1)
begin = (Dwarf_Addr) -1l;
}
if (begin == (Dwarf_Addr) -1l) /* Base address entry. */
{
char *b = format_dwarf_addr (dwflmod, address_size, end, end);
printf (gettext (" [%6tx] base address %s\n"), offset, b);
free (b);
base = end;
}
else if (begin == 0 && end == 0) /* End of list entry. */
{
if (first)
printf (gettext (" [%6tx] empty list\n"), offset);
first = true;
}
else
{
/* We have a location expression entry. */
uint_fast16_t len = read_2ubyte_unaligned_inc (dbg, readp);
char *b = format_dwarf_addr (dwflmod, address_size, base + begin,
begin);
char *e = format_dwarf_addr (dwflmod, address_size, base + end,
end);
if (first) /* First entry in a list. */
printf (gettext (" [%6tx] %s..%s"), offset, b, e);
else
printf (gettext (" %s..%s"), b, e);
free (b);
free (e);
if (endp - readp <= (ptrdiff_t) len)
{
fputs (gettext (" <INVALID DATA>\n"), stdout);
break;
}
print_ops (dwflmod, dbg, 1, 18 + (address_size * 4),
3 /*XXX*/, address_size, offset_size, cu, len, readp);
first = false;
readp += len;
}
}
}
struct mac_culist
{
Dwarf_Die die;
Dwarf_Off offset;
Dwarf_Files *files;
struct mac_culist *next;
};
static int
mac_compare (const void *p1, const void *p2)
{
struct mac_culist *m1 = (struct mac_culist *) p1;
struct mac_culist *m2 = (struct mac_culist *) p2;
if (m1->offset < m2->offset)
return -1;
if (m1->offset > m2->offset)
return 1;
return 0;
}
static void
print_debug_macinfo_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
putc_unlocked ('\n', stdout);
/* There is no function in libdw to iterate over the raw content of
the section but it is easy enough to do. */
Elf_Data *data = dbg->sectiondata[IDX_debug_macinfo];
if (unlikely (data == NULL || data->d_buf == NULL))
{
error (0, 0, gettext ("cannot get macro information section data: %s"),
elf_errmsg (-1));
return;
}
/* Get the source file information for all CUs. */
Dwarf_Off offset;
Dwarf_Off ncu = 0;
size_t hsize;
struct mac_culist *culist = NULL;
size_t nculist = 0;
while (dwarf_nextcu (dbg, offset = ncu, &ncu, &hsize, NULL, NULL, NULL) == 0)
{
Dwarf_Die cudie;
if (dwarf_offdie (dbg, offset + hsize, &cudie) == NULL)
continue;
Dwarf_Attribute attr;
if (dwarf_attr (&cudie, DW_AT_macro_info, &attr) == NULL)
continue;
Dwarf_Word macoff;
if (dwarf_formudata (&attr, &macoff) != 0)
continue;
struct mac_culist *newp = (struct mac_culist *) alloca (sizeof (*newp));
newp->die = cudie;
newp->offset = macoff;
newp->files = NULL;
newp->next = culist;
culist = newp;
++nculist;
}
/* Convert the list into an array for easier consumption. */
struct mac_culist *cus = (struct mac_culist *) alloca ((nculist + 1)
* sizeof (*cus));
/* Add sentinel. */
cus[nculist].offset = data->d_size;
cus[nculist].files = (Dwarf_Files *) -1l;
if (nculist > 0)
{
for (size_t cnt = nculist - 1; culist != NULL; --cnt)
{
assert (cnt < nculist);
cus[cnt] = *culist;
culist = culist->next;
}
/* Sort the array according to the offset in the .debug_macinfo
section. Note we keep the sentinel at the end. */
qsort (cus, nculist, sizeof (*cus), mac_compare);
}
const unsigned char *readp = (const unsigned char *) data->d_buf;
const unsigned char *readendp = readp + data->d_size;
int level = 1;
while (readp < readendp)
{
unsigned int opcode = *readp++;
unsigned int u128;
unsigned int u128_2;
const unsigned char *endp;
switch (opcode)
{
case DW_MACINFO_define:
case DW_MACINFO_undef:
case DW_MACINFO_vendor_ext:
/* For the first two opcodes the parameters are
line, string
For the latter
number, string.
We can treat these cases together. */
get_uleb128 (u128, readp, readendp);
endp = memchr (readp, '\0', readendp - readp);
if (unlikely (endp == NULL))
{
printf (gettext ("\
%*s*** non-terminated string at end of section"),
level, "");
return;
}
if (opcode == DW_MACINFO_define)
printf ("%*s#define %s, line %u\n",
level, "", (char *) readp, u128);
else if (opcode == DW_MACINFO_undef)
printf ("%*s#undef %s, line %u\n",
level, "", (char *) readp, u128);
else
printf (" #vendor-ext %s, number %u\n", (char *) readp, u128);
readp = endp + 1;
break;
case DW_MACINFO_start_file:
/* The two parameters are line and file index, in this order. */
get_uleb128 (u128, readp, readendp);
if (readendp - readp < 1)
{
printf (gettext ("\
%*s*** missing DW_MACINFO_start_file argument at end of section"),
level, "");
return;
}
get_uleb128 (u128_2, readp, readendp);
/* Find the CU DIE for this file. */
size_t macoff = readp - (const unsigned char *) data->d_buf;
const char *fname = "???";
if (macoff >= cus[0].offset)
{
while (macoff >= cus[1].offset && cus[1].offset != data->d_size)
++cus;
if (cus[0].files == NULL
&& dwarf_getsrcfiles (&cus[0].die, &cus[0].files, NULL) != 0)
cus[0].files = (Dwarf_Files *) -1l;
if (cus[0].files != (Dwarf_Files *) -1l)
fname = (dwarf_filesrc (cus[0].files, u128_2, NULL, NULL)
?: "???");
}
printf ("%*sstart_file %u, [%u] %s\n",
level, "", u128, u128_2, fname);
++level;
break;
case DW_MACINFO_end_file:
--level;
printf ("%*send_file\n", level, "");
/* Nothing more to do. */
break;
default:
// XXX gcc seems to generate files with a trailing zero.
if (unlikely (opcode != 0 || readp != readendp))
printf ("%*s*** invalid opcode %u\n", level, "", opcode);
break;
}
}
}
static void
print_debug_macro_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
printf (gettext ("\
\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
putc_unlocked ('\n', stdout);
Elf_Data *data = dbg->sectiondata[IDX_debug_macro];
if (unlikely (data == NULL || data->d_buf == NULL))
{
error (0, 0, gettext ("cannot get macro information section data: %s"),
elf_errmsg (-1));
return;
}
/* Get the source file information for all CUs. Uses same
datastructure as macinfo. But uses offset field to directly
match .debug_line offset. And just stored in a list. */
Dwarf_Off offset;
Dwarf_Off ncu = 0;
size_t hsize;
struct mac_culist *culist = NULL;
size_t nculist = 0;
while (dwarf_nextcu (dbg, offset = ncu, &ncu, &hsize, NULL, NULL, NULL) == 0)
{
Dwarf_Die cudie;
if (dwarf_offdie (dbg, offset + hsize, &cudie) == NULL)
continue;
Dwarf_Attribute attr;
if (dwarf_attr (&cudie, DW_AT_stmt_list, &attr) == NULL)
continue;
Dwarf_Word lineoff;
if (dwarf_formudata (&attr, &lineoff) != 0)
continue;
struct mac_culist *newp = (struct mac_culist *) alloca (sizeof (*newp));
newp->die = cudie;
newp->offset = lineoff;
newp->files = NULL;
newp->next = culist;
culist = newp;
++nculist;
}
const unsigned char *readp = (const unsigned char *) data->d_buf;
const unsigned char *readendp = readp + data->d_size;
while (readp < readendp)
{
printf (gettext (" Offset: 0x%" PRIx64 "\n"),
(uint64_t) (readp - (const unsigned char *) data->d_buf));
// Header, 2 byte version, 1 byte flag, optional .debug_line offset,
// optional vendor extension macro entry table.
if (readp + 2 > readendp)
{
invalid_data:
error (0, 0, gettext ("invalid data"));
return;
}
const uint16_t vers = read_2ubyte_unaligned_inc (dbg, readp);
printf (gettext (" Version: %" PRIu16 "\n"), vers);
// Version 4 is the GNU extension for DWARF4. DWARF5 will use version
// 5 when it gets standardized.
if (vers != 4)
{
printf (gettext (" unknown version, cannot parse section\n"));
return;
}
if (readp + 1 > readendp)
goto invalid_data;
const unsigned char flag = *readp++;
printf (gettext (" Flag: 0x%" PRIx8 "\n"), flag);
unsigned int offset_len = (flag & 0x01) ? 8 : 4;
printf (gettext (" Offset length: %" PRIu8 "\n"), offset_len);
Dwarf_Off line_offset = -1;
if (flag & 0x02)
{
if (offset_len == 8)
line_offset = read_8ubyte_unaligned_inc (dbg, readp);
else
line_offset = read_4ubyte_unaligned_inc (dbg, readp);
printf (gettext (" .debug_line offset: 0x%" PRIx64 "\n"),
line_offset);
}
const unsigned char *vendor[DW_MACRO_GNU_hi_user - DW_MACRO_GNU_lo_user];
memset (vendor, 0, sizeof vendor);
if (flag & 0x04)
{
// 1 byte length, for each item, 1 byte opcode, uleb128 number
// of arguments, for each argument 1 byte form code.
if (readp + 1 > readendp)
goto invalid_data;
unsigned int tlen = *readp++;
printf (gettext (" extension opcode table, %" PRIu8 " items:\n"),
tlen);
for (unsigned int i = 0; i < tlen; i++)
{
if (readp + 1 > readendp)
goto invalid_data;
unsigned int opcode = *readp++;
printf (gettext (" [%" PRIx8 "]"), opcode);
if (opcode < DW_MACRO_GNU_lo_user
|| opcode > DW_MACRO_GNU_hi_user)
goto invalid_data;
// Record the start of description for this vendor opcode.
// uleb128 nr args, 1 byte per arg form.
vendor[opcode - DW_MACRO_GNU_lo_user] = readp;
if (readp + 1 > readendp)
goto invalid_data;
unsigned int args = *readp++;
if (args > 0)
{
printf (gettext (" %" PRIu8 " arguments:"), args);
while (args > 0)
{
if (readp + 1 > readendp)
goto invalid_data;
unsigned int form = *readp++;
printf (" %s", dwarf_form_string (form));
if (form != DW_FORM_data1
&& form != DW_FORM_data2
&& form != DW_FORM_data4
&& form != DW_FORM_data8
&& form != DW_FORM_sdata
&& form != DW_FORM_udata
&& form != DW_FORM_block
&& form != DW_FORM_block1
&& form != DW_FORM_block2
&& form != DW_FORM_block4
&& form != DW_FORM_flag
&& form != DW_FORM_string
&& form != DW_FORM_strp
&& form != DW_FORM_sec_offset)
goto invalid_data;
args--;
if (args > 0)
putchar_unlocked (',');
}
}
else
printf (gettext (" no arguments."));
putchar_unlocked ('\n');
}
}
putchar_unlocked ('\n');
int level = 1;
if (readp + 1 > readendp)
goto invalid_data;
unsigned int opcode = *readp++;
while (opcode != 0)
{
unsigned int u128;
unsigned int u128_2;
const unsigned char *endp;
uint64_t off;
switch (opcode)
{
case DW_MACRO_GNU_start_file:
get_uleb128 (u128, readp, readendp);
if (readp >= readendp)
goto invalid_data;
get_uleb128 (u128_2, readp, readendp);
/* Find the CU DIE that matches this line offset. */
const char *fname = "???";
if (line_offset != (Dwarf_Off) -1)
{
struct mac_culist *cu = culist;
while (cu != NULL && line_offset != cu->offset)
cu = cu->next;
if (cu != NULL)
{
if (cu->files == NULL
&& dwarf_getsrcfiles (&cu->die, &cu->files,
NULL) != 0)
cu->files = (Dwarf_Files *) -1l;
if (cu->files != (Dwarf_Files *) -1l)
fname = (dwarf_filesrc (cu->files, u128_2,
NULL, NULL) ?: "???");
}
}
printf ("%*sstart_file %u, [%u] %s\n",
level, "", u128, u128_2, fname);
++level;
break;
case DW_MACRO_GNU_end_file:
--level;
printf ("%*send_file\n", level, "");
break;
case DW_MACRO_GNU_define:
get_uleb128 (u128, readp, readendp);
endp = memchr (readp, '\0', readendp - readp);
if (endp == NULL)
goto invalid_data;
printf ("%*s#define %s, line %u\n",
level, "", readp, u128);
readp = endp + 1;
break;
case DW_MACRO_GNU_undef:
get_uleb128 (u128, readp, readendp);
endp = memchr (readp, '\0', readendp - readp);
if (endp == NULL)
goto invalid_data;
printf ("%*s#undef %s, line %u\n",
level, "", readp, u128);
readp = endp + 1;
break;
case DW_MACRO_GNU_define_indirect:
get_uleb128 (u128, readp, readendp);
if (readp + offset_len > readendp)
goto invalid_data;
if (offset_len == 8)
off = read_8ubyte_unaligned_inc (dbg, readp);
else
off = read_4ubyte_unaligned_inc (dbg, readp);
printf ("%*s#define %s, line %u (indirect)\n",
level, "", dwarf_getstring (dbg, off, NULL), u128);
break;
case DW_MACRO_GNU_undef_indirect:
get_uleb128 (u128, readp, readendp);
if (readp + offset_len > readendp)
goto invalid_data;
if (offset_len == 8)
off = read_8ubyte_unaligned_inc (dbg, readp);
else
off = read_4ubyte_unaligned_inc (dbg, readp);
printf ("%*s#undef %s, line %u (indirect)\n",
level, "", dwarf_getstring (dbg, off, NULL), u128);
break;
case DW_MACRO_GNU_transparent_include:
if (readp + offset_len > readendp)
goto invalid_data;
if (offset_len == 8)
off = read_8ubyte_unaligned_inc (dbg, readp);
else
off = read_4ubyte_unaligned_inc (dbg, readp);
printf ("%*s#include offset 0x%" PRIx64 "\n",
level, "", off);
break;
default:
printf ("%*svendor opcode 0x%" PRIx8, level, "", opcode);
if (opcode < DW_MACRO_GNU_lo_user
|| opcode > DW_MACRO_GNU_lo_user
|| vendor[opcode - DW_MACRO_GNU_lo_user] == NULL)
goto invalid_data;
const unsigned char *op_desc;
op_desc = vendor[opcode - DW_MACRO_GNU_lo_user];
// Just skip the arguments, we cannot really interpret them,
// but print as much as we can.
unsigned int args = *op_desc++;
while (args > 0)
{
unsigned int form = *op_desc++;
Dwarf_Word val;
switch (form)
{
case DW_FORM_data1:
if (readp + 1 > readendp)
goto invalid_data;
val = *readp++;
printf (" %" PRIx8, (unsigned int) val);
break;
case DW_FORM_data2:
if (readp + 2 > readendp)
goto invalid_data;
val = read_2ubyte_unaligned_inc (dbg, readp);
printf(" %" PRIx16, (unsigned int) val);
break;
case DW_FORM_data4:
if (readp + 4 > readendp)
goto invalid_data;
val = read_4ubyte_unaligned_inc (dbg, readp);
printf (" %" PRIx32, (unsigned int) val);
break;
case DW_FORM_data8:
if (readp + 8 > readendp)
goto invalid_data;
val = read_8ubyte_unaligned_inc (dbg, readp);
printf (" %" PRIx64, val);
break;
case DW_FORM_sdata:
get_sleb128 (val, readp, readendp);
printf (" %" PRIx64, val);
break;
case DW_FORM_udata:
get_uleb128 (val, readp, readendp);
printf (" %" PRIx64, val);
break;
case DW_FORM_block:
get_uleb128 (val, readp, readendp);
printf (" block[%" PRIu64 "]", val);
if (readp + val > readendp)
goto invalid_data;
readp += val;
break;
case DW_FORM_block1:
if (readp + 1 > readendp)
goto invalid_data;
val = *readp++;
printf (" block[%" PRIu64 "]", val);
if (readp + val > readendp)
goto invalid_data;
break;
case DW_FORM_block2:
if (readp + 2 > readendp)
goto invalid_data;
val = read_2ubyte_unaligned_inc (dbg, readp);
printf (" block[%" PRIu64 "]", val);
if (readp + val > readendp)
goto invalid_data;
break;
case DW_FORM_block4:
if (readp + 2 > readendp)
goto invalid_data;
val =read_4ubyte_unaligned_inc (dbg, readp);
printf (" block[%" PRIu64 "]", val);
if (readp + val > readendp)
goto invalid_data;
break;
case DW_FORM_flag:
if (readp + 1 > readendp)
goto invalid_data;
val = *readp++;
printf (" %s", nl_langinfo (val != 0 ? YESSTR : NOSTR));
break;
case DW_FORM_string:
endp = memchr (readp, '\0', readendp - readp);
if (endp == NULL)
goto invalid_data;
printf (" %s", readp);
readp = endp + 1;
break;
case DW_FORM_strp:
if (readp + offset_len > readendp)
goto invalid_data;
if (offset_len == 8)
val = read_8ubyte_unaligned_inc (dbg, readp);
else
val = read_4ubyte_unaligned_inc (dbg, readp);
printf (" %s", dwarf_getstring (dbg, val, NULL));
break;
case DW_FORM_sec_offset:
if (readp + offset_len > readendp)
goto invalid_data;
if (offset_len == 8)
val = read_8ubyte_unaligned_inc (dbg, readp);
else
val = read_4ubyte_unaligned_inc (dbg, readp);
printf (" %" PRIx64, val);
break;
default:
error (0, 0, gettext ("vendor opcode not verified?"));
return;
}
args--;
if (args > 0)
putchar_unlocked (',');
}
putchar_unlocked ('\n');
}
if (readp + 1 > readendp)
goto invalid_data;
opcode = *readp++;
if (opcode == 0)
putchar_unlocked ('\n');
}
}
}
/* Callback for printing global names. */
static int
print_pubnames (Dwarf *dbg __attribute__ ((unused)), Dwarf_Global *global,
void *arg)
{
int *np = (int *) arg;
printf (gettext (" [%5d] DIE offset: %6" PRId64
", CU DIE offset: %6" PRId64 ", name: %s\n"),
(*np)++, global->die_offset, global->cu_offset, global->name);
return 0;
}
/* Print the known exported symbols in the DWARF section '.debug_pubnames'. */
static void
print_debug_pubnames_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
printf (gettext ("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset);
int n = 0;
(void) dwarf_getpubnames (dbg, print_pubnames, &n, 0);
}
/* Print the content of the DWARF string section '.debug_str'. */
static void
print_debug_str_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
const size_t sh_size = (dbg->sectiondata[IDX_debug_str] ?
dbg->sectiondata[IDX_debug_str]->d_size : 0);
/* Compute floor(log16(shdr->sh_size)). */
GElf_Addr tmp = sh_size;
int digits = 1;
while (tmp >= 16)
{
++digits;
tmp >>= 4;
}
digits = MAX (4, digits);
printf (gettext ("\nDWARF section [%2zu] '%s' at offset %#" PRIx64 ":\n"
" %*s String\n"),
elf_ndxscn (scn),
section_name (ebl, ehdr, shdr), (uint64_t) shdr->sh_offset,
/* TRANS: the debugstr| prefix makes the string unique. */
digits + 2, sgettext ("debugstr|Offset"));
Dwarf_Off offset = 0;
while (offset < sh_size)
{
size_t len;
const char *str = dwarf_getstring (dbg, offset, &len);
if (unlikely (str == NULL))
{
printf (gettext (" *** error while reading strings: %s\n"),
dwarf_errmsg (-1));
break;
}
printf (" [%*" PRIx64 "] \"%s\"\n", digits, (uint64_t) offset, str);
offset += len + 1;
}
}
/* Print the content of the call frame search table section
'.eh_frame_hdr'. */
static void
print_debug_frame_hdr_section (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl __attribute__ ((unused)),
GElf_Ehdr *ehdr __attribute__ ((unused)),
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
printf (gettext ("\
\nCall frame search table section [%2zu] '.eh_frame_hdr':\n"),
elf_ndxscn (scn));
Elf_Data *data = elf_rawdata (scn, NULL);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get %s content: %s"),
".eh_frame_hdr", elf_errmsg (-1));
return;
}
const unsigned char *readp = data->d_buf;
const unsigned char *const dataend = ((unsigned char *) data->d_buf
+ data->d_size);
if (unlikely (readp + 4 > dataend))
{
invalid_data:
error (0, 0, gettext ("invalid data"));
return;
}
unsigned int version = *readp++;
unsigned int eh_frame_ptr_enc = *readp++;
unsigned int fde_count_enc = *readp++;
unsigned int table_enc = *readp++;
printf (" version: %u\n"
" eh_frame_ptr_enc: %#x ",
version, eh_frame_ptr_enc);
print_encoding_base ("", eh_frame_ptr_enc);
printf (" fde_count_enc: %#x ", fde_count_enc);
print_encoding_base ("", fde_count_enc);
printf (" table_enc: %#x ", table_enc);
print_encoding_base ("", table_enc);
uint64_t eh_frame_ptr = 0;
if (eh_frame_ptr_enc != DW_EH_PE_omit)
{
readp = read_encoded (eh_frame_ptr_enc, readp, dataend, &eh_frame_ptr,
dbg);
if (unlikely (readp == NULL))
goto invalid_data;
printf (" eh_frame_ptr: %#" PRIx64, eh_frame_ptr);
if ((eh_frame_ptr_enc & 0x70) == DW_EH_PE_pcrel)
printf (" (offset: %#" PRIx64 ")",
/* +4 because of the 4 byte header of the section. */
(uint64_t) shdr->sh_offset + 4 + eh_frame_ptr);
putchar_unlocked ('\n');
}
uint64_t fde_count = 0;
if (fde_count_enc != DW_EH_PE_omit)
{
readp = read_encoded (fde_count_enc, readp, dataend, &fde_count, dbg);
if (unlikely (readp == NULL))
goto invalid_data;
printf (" fde_count: %" PRIu64 "\n", fde_count);
}
if (fde_count == 0 || table_enc == DW_EH_PE_omit)
return;
puts (" Table:");
/* Optimize for the most common case. */
if (table_enc == (DW_EH_PE_datarel | DW_EH_PE_sdata4))
while (fde_count > 0 && readp + 8 <= dataend)
{
int32_t initial_location = read_4sbyte_unaligned_inc (dbg, readp);
uint64_t initial_offset = ((uint64_t) shdr->sh_offset
+ (int64_t) initial_location);
int32_t address = read_4sbyte_unaligned_inc (dbg, readp);
// XXX Possibly print symbol name or section offset for initial_offset
printf (" %#" PRIx32 " (offset: %#6" PRIx64 ") -> %#" PRIx32
" fde=[%6" PRIx64 "]\n",
initial_location, initial_offset,
address, address - (eh_frame_ptr + 4));
}
else
while (0 && readp < dataend)
{
}
}
/* Print the content of the exception handling table section
'.eh_frame_hdr'. */
static void
print_debug_exception_table (Dwfl_Module *dwflmod __attribute__ ((unused)),
Ebl *ebl __attribute__ ((unused)),
GElf_Ehdr *ehdr __attribute__ ((unused)),
Elf_Scn *scn,
GElf_Shdr *shdr __attribute__ ((unused)),
Dwarf *dbg __attribute__ ((unused)))
{
printf (gettext ("\
\nException handling table section [%2zu] '.gcc_except_table':\n"),
elf_ndxscn (scn));
Elf_Data *data = elf_rawdata (scn, NULL);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get %s content: %s"),
".gcc_except_table", elf_errmsg (-1));
return;
}
const unsigned char *readp = data->d_buf;
const unsigned char *const dataend = readp + data->d_size;
if (unlikely (readp + 1 > dataend))
{
invalid_data:
error (0, 0, gettext ("invalid data"));
return;
}
unsigned int lpstart_encoding = *readp++;
printf (gettext (" LPStart encoding: %#x "), lpstart_encoding);
print_encoding_base ("", lpstart_encoding);
if (lpstart_encoding != DW_EH_PE_omit)
{
uint64_t lpstart;
readp = read_encoded (lpstart_encoding, readp, dataend, &lpstart, dbg);
printf (" LPStart: %#" PRIx64 "\n", lpstart);
}
if (unlikely (readp + 1 > dataend))
goto invalid_data;
unsigned int ttype_encoding = *readp++;
printf (gettext (" TType encoding: %#x "), ttype_encoding);
print_encoding_base ("", ttype_encoding);
const unsigned char *ttype_base = NULL;
if (ttype_encoding != DW_EH_PE_omit)
{
unsigned int ttype_base_offset;
get_uleb128 (ttype_base_offset, readp, dataend);
printf (" TType base offset: %#x\n", ttype_base_offset);
if ((size_t) (dataend - readp) > ttype_base_offset)
ttype_base = readp + ttype_base_offset;
}
if (unlikely (readp + 1 > dataend))
goto invalid_data;
unsigned int call_site_encoding = *readp++;
printf (gettext (" Call site encoding: %#x "), call_site_encoding);
print_encoding_base ("", call_site_encoding);
unsigned int call_site_table_len;
get_uleb128 (call_site_table_len, readp, dataend);
const unsigned char *const action_table = readp + call_site_table_len;
if (unlikely (action_table > dataend))
goto invalid_data;
unsigned int u = 0;
unsigned int max_action = 0;
while (readp < action_table)
{
if (u == 0)
puts (gettext ("\n Call site table:"));
uint64_t call_site_start;
readp = read_encoded (call_site_encoding, readp, dataend,
&call_site_start, dbg);
uint64_t call_site_length;
readp = read_encoded (call_site_encoding, readp, dataend,
&call_site_length, dbg);
uint64_t landing_pad;
readp = read_encoded (call_site_encoding, readp, dataend,
&landing_pad, dbg);
unsigned int action;
get_uleb128 (action, readp, dataend);
max_action = MAX (action, max_action);
printf (gettext (" [%4u] Call site start: %#" PRIx64 "\n"
" Call site length: %" PRIu64 "\n"
" Landing pad: %#" PRIx64 "\n"
" Action: %u\n"),
u++, call_site_start, call_site_length, landing_pad, action);
}
if (readp != action_table)
goto invalid_data;
unsigned int max_ar_filter = 0;
if (max_action > 0)
{
puts ("\n Action table:");
size_t maxdata = (size_t) (dataend - action_table);
if (max_action > maxdata || maxdata - max_action < 1)
{
invalid_action_table:
fputs (gettext (" <INVALID DATA>\n"), stdout);
return;
}
const unsigned char *const action_table_end
= action_table + max_action + 1;
u = 0;
do
{
int ar_filter;
get_sleb128 (ar_filter, readp, action_table_end);
if (ar_filter > 0 && (unsigned int) ar_filter > max_ar_filter)
max_ar_filter = ar_filter;
int ar_disp;
if (readp >= action_table_end)
goto invalid_action_table;
get_sleb128 (ar_disp, readp, action_table_end);
printf (" [%4u] ar_filter: % d\n"
" ar_disp: % -5d",
u, ar_filter, ar_disp);
if (abs (ar_disp) & 1)
printf (" -> [%4u]\n", u + (ar_disp + 1) / 2);
else if (ar_disp != 0)
puts (" -> ???");
else
putchar_unlocked ('\n');
++u;
}
while (readp < action_table_end);
}
if (max_ar_filter > 0 && ttype_base != NULL)
{
unsigned char dsize;
puts ("\n TType table:");
// XXX Not *4, size of encoding;
switch (ttype_encoding & 7)
{
case DW_EH_PE_udata2:
case DW_EH_PE_sdata2:
dsize = 2;
break;
case DW_EH_PE_udata4:
case DW_EH_PE_sdata4:
dsize = 4;
break;
case DW_EH_PE_udata8:
case DW_EH_PE_sdata8:
dsize = 8;
break;
default:
dsize = 0;
error (1, 0, gettext ("invalid TType encoding"));
}
if (max_ar_filter
> (size_t) (ttype_base - (const unsigned char *) data->d_buf) / dsize)
goto invalid_data;
readp = ttype_base - max_ar_filter * dsize;
do
{
uint64_t ttype;
readp = read_encoded (ttype_encoding, readp, ttype_base, &ttype,
dbg);
printf (" [%4u] %#" PRIx64 "\n", max_ar_filter--, ttype);
}
while (readp < ttype_base);
}
}
/* Print the content of the '.gdb_index' section.
http://sourceware.org/gdb/current/onlinedocs/gdb/Index-Section-Format.html
*/
static void
print_gdb_index_section (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr,
Elf_Scn *scn, GElf_Shdr *shdr, Dwarf *dbg)
{
printf (gettext ("\nGDB section [%2zu] '%s' at offset %#" PRIx64
" contains %" PRId64 " bytes :\n"),
elf_ndxscn (scn), section_name (ebl, ehdr, shdr),
(uint64_t) shdr->sh_offset, (uint64_t) shdr->sh_size);
Elf_Data *data = elf_rawdata (scn, NULL);
if (unlikely (data == NULL))
{
error (0, 0, gettext ("cannot get %s content: %s"),
".gdb_index", elf_errmsg (-1));
return;
}
// .gdb_index is always in little endian.
Dwarf dummy_dbg = { .other_byte_order = MY_ELFDATA != ELFDATA2LSB };
dbg = &dummy_dbg;
const unsigned char *readp = data->d_buf;
const unsigned char *const dataend = readp + data->d_size;
if (unlikely (readp + 4 > dataend))
{
invalid_data:
error (0, 0, gettext ("invalid data"));
return;
}
int32_t vers = read_4ubyte_unaligned (dbg, readp);
printf (gettext (" Version: %" PRId32 "\n"), vers);
// The only difference between version 4 and version 5 is the
// hash used for generating the table. Version 6 contains symbols
// for inlined functions, older versions didn't. Version 7 adds
// symbol kinds. Version 8 just indicates that it correctly includes
// TUs for symbols.
if (vers < 4 || vers > 8)
{
printf (gettext (" unknown version, cannot parse section\n"));
return;
}
readp += 4;
if (unlikely (readp + 4 > dataend))
goto invalid_data;
uint32_t cu_off = read_4ubyte_unaligned (dbg, readp);
printf (gettext (" CU offset: %#" PRIx32 "\n"), cu_off);
readp += 4;
if (unlikely (readp + 4 > dataend))
goto invalid_data;
uint32_t tu_off = read_4ubyte_unaligned (dbg, readp);
printf (gettext (" TU offset: %#" PRIx32 "\n"), tu_off);
readp += 4;
if (unlikely (readp + 4 > dataend))
goto invalid_data;
uint32_t addr_off = read_4ubyte_unaligned (dbg, readp);
printf (gettext (" address offset: %#" PRIx32 "\n"), addr_off);
readp += 4;
if (unlikely (readp + 4 > dataend))
goto invalid_data;
uint32_t sym_off = read_4ubyte_unaligned (dbg, readp);
printf (gettext (" symbol offset: %#" PRIx32 "\n"), sym_off);
readp += 4;
if (unlikely (readp + 4 > dataend))
goto invalid_data;
uint32_t const_off = read_4ubyte_unaligned (dbg, readp);
printf (gettext (" constant offset: %#" PRIx32 "\n"), const_off);
if (unlikely ((size_t) (dataend - (const unsigned char *) data->d_buf)
< const_off))
goto invalid_data;
readp = data->d_buf + cu_off;
const unsigned char *nextp = data->d_buf + tu_off;
if (tu_off >= data->d_size)
goto invalid_data;
size_t cu_nr = (nextp - readp) / 16;
printf (gettext ("\n CU list at offset %#" PRIx32
" contains %zu entries:\n"),
cu_off, cu_nr);
size_t n = 0;
while (dataend - readp >= 16 && n < cu_nr)
{
uint64_t off = read_8ubyte_unaligned (dbg, readp);
readp += 8;
uint64_t len = read_8ubyte_unaligned (dbg, readp);
readp += 8;
printf (" [%4zu] start: %0#8" PRIx64
", length: %5" PRIu64 "\n", n, off, len);
n++;
}
readp = data->d_buf + tu_off;
nextp = data->d_buf + addr_off;
if (addr_off >= data->d_size)
goto invalid_data;
size_t tu_nr = (nextp - readp) / 24;
printf (gettext ("\n TU list at offset %#" PRIx32
" contains %zu entries:\n"),
tu_off, tu_nr);
n = 0;
while (dataend - readp >= 24 && n < tu_nr)
{
uint64_t off = read_8ubyte_unaligned (dbg, readp);
readp += 8;
uint64_t type = read_8ubyte_unaligned (dbg, readp);
readp += 8;
uint64_t sig = read_8ubyte_unaligned (dbg, readp);
readp += 8;
printf (" [%4zu] CU offset: %5" PRId64
", type offset: %5" PRId64
", signature: %0#8" PRIx64 "\n", n, off, type, sig);
n++;
}
readp = data->d_buf + addr_off;
nextp = data->d_buf + sym_off;
if (sym_off >= data->d_size)
goto invalid_data;
size_t addr_nr = (nextp - readp) / 20;
printf (gettext ("\n Address list at offset %#" PRIx32
" contains %zu entries:\n"),
addr_off, addr_nr);
n = 0;
while (dataend - readp >= 20 && n < addr_nr)
{
uint64_t low = read_8ubyte_unaligned (dbg, readp);
readp += 8;
uint64_t high = read_8ubyte_unaligned (dbg, readp);
readp += 8;
uint32_t idx = read_4ubyte_unaligned (dbg, readp);
readp += 4;
char *l = format_dwarf_addr (dwflmod, 8, low, low);
char *h = format_dwarf_addr (dwflmod, 8, high - 1, high);
printf (" [%4zu] %s..%s, CU index: %5" PRId32 "\n",
n, l, h, idx);
free (l);
free (h);
n++;
}
const unsigned char *const_start = data->d_buf + const_off;
if (const_off >= data->d_size)
goto invalid_data;
readp = data->d_buf + sym_off;
nextp = const_start;
size_t sym_nr = (nextp - readp) / 8;
printf (gettext ("\n Symbol table at offset %#" PRIx32
" contains %zu slots:\n"),
addr_off, sym_nr);
n = 0;
while (dataend - readp >= 8 && n < sym_nr)
{
uint32_t name = read_4ubyte_unaligned (dbg, readp);
readp += 4;
uint32_t vector = read_4ubyte_unaligned (dbg, readp);
readp += 4;
if (name != 0 || vector != 0)
{
const unsigned char *sym = const_start + name;
if (unlikely ((size_t) (dataend - const_start) < name
|| memchr (sym, '\0', dataend - sym) == NULL))
goto invalid_data;
printf (" [%4zu] symbol: %s, CUs: ", n, sym);
const unsigned char *readcus = const_start + vector;
if (unlikely ((size_t) (dataend - const_start) < vector))
goto invalid_data;
uint32_t cus = read_4ubyte_unaligned (dbg, readcus);
while (cus--)
{
uint32_t cu_kind, cu, kind;
bool is_static;
readcus += 4;
if (unlikely (readcus + 4 > dataend))
goto invalid_data;
cu_kind = read_4ubyte_unaligned (dbg, readcus);
cu = cu_kind & ((1 << 24) - 1);
kind = (cu_kind >> 28) & 7;
is_static = cu_kind & (1U << 31);
if (cu > cu_nr - 1)
printf ("%" PRId32 "T", cu - (uint32_t) cu_nr);
else
printf ("%" PRId32, cu);
if (kind != 0)
{
printf (" (");
switch (kind)
{
case 1:
printf ("type");
break;
case 2:
printf ("var");
break;
case 3:
printf ("func");
break;
case 4:
printf ("other");
break;
default:
printf ("unknown-0x%" PRIx32, kind);
break;
}
printf (":%c)", (is_static ? 'S' : 'G'));
}
if (cus > 0)
printf (", ");
}
printf ("\n");
}
n++;
}
}
static void
print_debug (Dwfl_Module *dwflmod, Ebl *ebl, GElf_Ehdr *ehdr)
{
/* Before we start the real work get a debug context descriptor. */
Dwarf_Addr dwbias;
Dwarf *dbg = dwfl_module_getdwarf (dwflmod, &dwbias);
Dwarf dummy_dbg =
{
.elf = ebl->elf,
.other_byte_order = MY_ELFDATA != ehdr->e_ident[EI_DATA]
};
if (dbg == NULL)
{
if ((print_debug_sections & ~section_exception) != 0)
error (0, 0, gettext ("cannot get debug context descriptor: %s"),
dwfl_errmsg (-1));
dbg = &dummy_dbg;
}
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
/* Look through all the sections for the debugging sections to print. */
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr != NULL && shdr->sh_type == SHT_PROGBITS)
{
static const struct
{
const char *name;
enum section_e bitmask;
void (*fp) (Dwfl_Module *, Ebl *,
GElf_Ehdr *, Elf_Scn *, GElf_Shdr *, Dwarf *);
} debug_sections[] =
{
#define NEW_SECTION(name) \
{ ".debug_" #name, section_##name, print_debug_##name##_section }
NEW_SECTION (abbrev),
NEW_SECTION (aranges),
NEW_SECTION (frame),
NEW_SECTION (info),
NEW_SECTION (types),
NEW_SECTION (line),
NEW_SECTION (loc),
NEW_SECTION (pubnames),
NEW_SECTION (str),
NEW_SECTION (macinfo),
NEW_SECTION (macro),
NEW_SECTION (ranges),
{ ".eh_frame", section_frame | section_exception,
print_debug_frame_section },
{ ".eh_frame_hdr", section_frame | section_exception,
print_debug_frame_hdr_section },
{ ".gcc_except_table", section_frame | section_exception,
print_debug_exception_table },
{ ".gdb_index", section_gdb_index, print_gdb_index_section }
};
const int ndebug_sections = (sizeof (debug_sections)
/ sizeof (debug_sections[0]));
const char *name = elf_strptr (ebl->elf, shstrndx,
shdr->sh_name);
if (name == NULL)
continue;
int n;
for (n = 0; n < ndebug_sections; ++n)
if (strcmp (name, debug_sections[n].name) == 0
|| (name[0] == '.' && name[1] == 'z'
&& debug_sections[n].name[1] == 'd'
&& strcmp (&name[2], &debug_sections[n].name[1]) == 0)
)
{
if ((print_debug_sections | implicit_debug_sections)
& debug_sections[n].bitmask)
debug_sections[n].fp (dwflmod, ebl, ehdr, scn, shdr, dbg);
break;
}
}
}
reset_listptr (&known_loclistptr);
reset_listptr (&known_rangelistptr);
}
#define ITEM_INDENT 4
#define WRAP_COLUMN 75
/* Print "NAME: FORMAT", wrapping when output text would make the line
exceed WRAP_COLUMN. Unpadded numbers look better for the core items
but this function is also used for registers which should be printed
aligned. Fortunately registers output uses fixed fields width (such
as %11d) for the alignment.
Line breaks should not depend on the particular values although that
may happen in some cases of the core items. */
static unsigned int
__attribute__ ((format (printf, 6, 7)))
print_core_item (unsigned int colno, char sep, unsigned int wrap,
size_t name_width, const char *name, const char *format, ...)
{
size_t len = strlen (name);
if (name_width < len)
name_width = len;
char *out;
va_list ap;
va_start (ap, format);
int out_len = vasprintf (&out, format, ap);
va_end (ap);
if (out_len == -1)
error (EXIT_FAILURE, 0, _("memory exhausted"));
size_t n = name_width + sizeof ": " - 1 + out_len;
if (colno == 0)
{
printf ("%*s", ITEM_INDENT, "");
colno = ITEM_INDENT + n;
}
else if (colno + 2 + n < wrap)
{
printf ("%c ", sep);
colno += 2 + n;
}
else
{
printf ("\n%*s", ITEM_INDENT, "");
colno = ITEM_INDENT + n;
}
printf ("%s: %*s%s", name, (int) (name_width - len), "", out);
free (out);
return colno;
}
static const void *
convert (Elf *core, Elf_Type type, uint_fast16_t count,
void *value, const void *data, size_t size)
{
Elf_Data valuedata =
{
.d_type = type,
.d_buf = value,
.d_size = size ?: gelf_fsize (core, type, count, EV_CURRENT),
.d_version = EV_CURRENT,
};
Elf_Data indata =
{
.d_type = type,
.d_buf = (void *) data,
.d_size = valuedata.d_size,
.d_version = EV_CURRENT,
};
Elf_Data *d = (gelf_getclass (core) == ELFCLASS32
? elf32_xlatetom : elf64_xlatetom)
(&valuedata, &indata, elf_getident (core, NULL)[EI_DATA]);
if (d == NULL)
error (EXIT_FAILURE, 0,
gettext ("cannot convert core note data: %s"), elf_errmsg (-1));
return data + indata.d_size;
}
typedef uint8_t GElf_Byte;
static unsigned int
handle_core_item (Elf *core, const Ebl_Core_Item *item, const void *desc,
unsigned int colno, size_t *repeated_size)
{
uint_fast16_t count = item->count ?: 1;
/* Ebl_Core_Item count is always a small number.
Make sure the backend didn't put in some large bogus value. */
assert (count < 128);
#define TYPES \
DO_TYPE (BYTE, Byte, "0x%.2" PRIx8, "%" PRId8); \
DO_TYPE (HALF, Half, "0x%.4" PRIx16, "%" PRId16); \
DO_TYPE (WORD, Word, "0x%.8" PRIx32, "%" PRId32); \
DO_TYPE (SWORD, Sword, "%" PRId32, "%" PRId32); \
DO_TYPE (XWORD, Xword, "0x%.16" PRIx64, "%" PRId64); \
DO_TYPE (SXWORD, Sxword, "%" PRId64, "%" PRId64)
#define DO_TYPE(NAME, Name, hex, dec) GElf_##Name Name
typedef union { TYPES; } value_t;
void *data = alloca (count * sizeof (value_t));
#undef DO_TYPE
#define DO_TYPE(NAME, Name, hex, dec) \
GElf_##Name *value_##Name __attribute__((unused)) = data
TYPES;
#undef DO_TYPE
size_t size = gelf_fsize (core, item->type, count, EV_CURRENT);
size_t convsize = size;
if (repeated_size != NULL)
{
if (*repeated_size > size && (item->format == 'b' || item->format == 'B'))
{
data = alloca (*repeated_size);
count *= *repeated_size / size;
convsize = count * size;
*repeated_size -= convsize;
}
else if (item->count != 0 || item->format != '\n')
*repeated_size -= size;
}
convert (core, item->type, count, data, desc + item->offset, convsize);
Elf_Type type = item->type;
if (type == ELF_T_ADDR)
type = gelf_getclass (core) == ELFCLASS32 ? ELF_T_WORD : ELF_T_XWORD;
switch (item->format)
{
case 'd':
assert (count == 1);
switch (type)
{
#define DO_TYPE(NAME, Name, hex, dec) \
case ELF_T_##NAME: \
colno = print_core_item (colno, ',', WRAP_COLUMN, \
0, item->name, dec, value_##Name[0]); \
break
TYPES;
#undef DO_TYPE
default:
abort ();
}
break;
case 'x':
assert (count == 1);
switch (type)
{
#define DO_TYPE(NAME, Name, hex, dec) \
case ELF_T_##NAME: \
colno = print_core_item (colno, ',', WRAP_COLUMN, \
0, item->name, hex, value_##Name[0]); \
break
TYPES;
#undef DO_TYPE
default:
abort ();
}
break;
case 'b':
case 'B':
assert (size % sizeof (unsigned int) == 0);
unsigned int nbits = count * size * 8;
unsigned int pop = 0;
for (const unsigned int *i = data; (void *) i < data + count * size; ++i)
pop += __builtin_popcount (*i);
bool negate = pop > nbits / 2;
const unsigned int bias = item->format == 'b';
{
char printed[(negate ? nbits - pop : pop) * 16 + 1];
char *p = printed;
*p = '\0';
if (BYTE_ORDER != LITTLE_ENDIAN && size > sizeof (unsigned int))
{
assert (size == sizeof (unsigned int) * 2);
for (unsigned int *i = data;
(void *) i < data + count * size; i += 2)
{
unsigned int w = i[1];
i[1] = i[0];
i[0] = w;
}
}
unsigned int lastbit = 0;
unsigned int run = 0;
for (const unsigned int *i = data;
(void *) i < data + count * size; ++i)
{
unsigned int bit = ((void *) i - data) * 8;
unsigned int w = negate ? ~*i : *i;
while (w != 0)
{
/* Note that a right shift equal to (or greater than)
the number of bits of w is undefined behaviour. In
particular when the least significant bit is bit 32
(w = 0x8000000) then w >>= n is undefined. So
explicitly handle that case separately. */
unsigned int n = ffs (w);
if (n < sizeof (w) * 8)
w >>= n;
else
w = 0;
bit += n;
if (lastbit != 0 && lastbit + 1 == bit)
++run;
else
{
if (lastbit == 0)
p += sprintf (p, "%u", bit - bias);
else if (run == 0)
p += sprintf (p, ",%u", bit - bias);
else
p += sprintf (p, "-%u,%u", lastbit - bias, bit - bias);
run = 0;
}
lastbit = bit;
}
}
if (lastbit > 0 && run > 0 && lastbit + 1 != nbits)
p += sprintf (p, "-%u", lastbit - bias);
colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name,
negate ? "~<%s>" : "<%s>", printed);
}
break;
case 'T':
case (char) ('T'|0x80):
assert (count == 2);
Dwarf_Word sec;
Dwarf_Word usec;
switch (type)
{
#define DO_TYPE(NAME, Name, hex, dec) \
case ELF_T_##NAME: \
sec = value_##Name[0]; \
usec = value_##Name[1]; \
break
TYPES;
#undef DO_TYPE
default:
abort ();
}
if (unlikely (item->format == (char) ('T'|0x80)))
{
/* This is a hack for an ill-considered 64-bit ABI where
tv_usec is actually a 32-bit field with 32 bits of padding
rounding out struct timeval. We've already converted it as
a 64-bit field. For little-endian, this just means the
high half is the padding; it's presumably zero, but should
be ignored anyway. For big-endian, it means the 32-bit
field went into the high half of USEC. */
GElf_Ehdr ehdr_mem;
GElf_Ehdr *ehdr = gelf_getehdr (core, &ehdr_mem);
if (likely (ehdr->e_ident[EI_DATA] == ELFDATA2MSB))
usec >>= 32;
else
usec &= UINT32_MAX;
}
colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name,
"%" PRIu64 ".%.6" PRIu64, sec, usec);
break;
case 'c':
assert (count == 1);
colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name,
"%c", value_Byte[0]);
break;
case 's':
colno = print_core_item (colno, ',', WRAP_COLUMN, 0, item->name,
"%.*s", (int) count, value_Byte);
break;
case '\n':
/* This is a list of strings separated by '\n'. */
assert (item->count == 0);
assert (repeated_size != NULL);
assert (item->name == NULL);
if (unlikely (item->offset >= *repeated_size))
break;
const char *s = desc + item->offset;
size = *repeated_size - item->offset;
*repeated_size = 0;
while (size > 0)
{
const char *eol = memchr (s, '\n', size);
int len = size;
if (eol != NULL)
len = eol - s;
printf ("%*s%.*s\n", ITEM_INDENT, "", len, s);
if (eol == NULL)
break;
size -= eol + 1 - s;
s = eol + 1;
}
colno = WRAP_COLUMN;
break;
case 'h':
break;
default:
error (0, 0, "XXX not handling format '%c' for %s",
item->format, item->name);
break;
}
#undef TYPES
return colno;
}
/* Sort items by group, and by layout offset within each group. */
static int
compare_core_items (const void *a, const void *b)
{
const Ebl_Core_Item *const *p1 = a;
const Ebl_Core_Item *const *p2 = b;
const Ebl_Core_Item *item1 = *p1;
const Ebl_Core_Item *item2 = *p2;
return ((item1->group == item2->group ? 0
: strcmp (item1->group, item2->group))
?: (int) item1->offset - (int) item2->offset);
}
/* Sort item groups by layout offset of the first item in the group. */
static int
compare_core_item_groups (const void *a, const void *b)
{
const Ebl_Core_Item *const *const *p1 = a;
const Ebl_Core_Item *const *const *p2 = b;
const Ebl_Core_Item *const *group1 = *p1;
const Ebl_Core_Item *const *group2 = *p2;
const Ebl_Core_Item *item1 = *group1;
const Ebl_Core_Item *item2 = *group2;
return (int) item1->offset - (int) item2->offset;
}
static unsigned int
handle_core_items (Elf *core, const void *desc, size_t descsz,
const Ebl_Core_Item *items, size_t nitems)
{
if (nitems == 0)
return 0;
unsigned int colno = 0;
/* FORMAT '\n' makes sense to be present only as a single item as it
processes all the data of a note. FORMATs 'b' and 'B' have a special case
if present as a single item but they can be also processed with other
items below. */
if (nitems == 1 && (items[0].format == '\n' || items[0].format == 'b'
|| items[0].format == 'B'))
{
assert (items[0].offset == 0);
size_t size = descsz;
colno = handle_core_item (core, items, desc, colno, &size);
/* If SIZE is not zero here there is some remaining data. But we do not
know how to process it anyway. */
return colno;
}
for (size_t i = 0; i < nitems; ++i)
assert (items[i].format != '\n');
/* Sort to collect the groups together. */
const Ebl_Core_Item *sorted_items[nitems];
for (size_t i = 0; i < nitems; ++i)
sorted_items[i] = &items[i];
qsort (sorted_items, nitems, sizeof sorted_items[0], &compare_core_items);
/* Collect the unique groups and sort them. */
const Ebl_Core_Item **groups[nitems];
groups[0] = &sorted_items[0];
size_t ngroups = 1;
for (size_t i = 1; i < nitems; ++i)
if (sorted_items[i]->group != sorted_items[i - 1]->group
&& strcmp (sorted_items[i]->group, sorted_items[i - 1]->group))
groups[ngroups++] = &sorted_items[i];
qsort (groups, ngroups, sizeof groups[0], &compare_core_item_groups);
/* Write out all the groups. */
const void *last = desc;
do
{
for (size_t i = 0; i < ngroups; ++i)
{
for (const Ebl_Core_Item **item = groups[i];
(item < &sorted_items[nitems]
&& ((*item)->group == groups[i][0]->group
|| !strcmp ((*item)->group, groups[i][0]->group)));
++item)
colno = handle_core_item (core, *item, desc, colno, NULL);
/* Force a line break at the end of the group. */
colno = WRAP_COLUMN;
}
if (descsz == 0)
break;
/* This set of items consumed a certain amount of the note's data.
If there is more data there, we have another unit of the same size.
Loop to print that out too. */
const Ebl_Core_Item *item = &items[nitems - 1];
size_t eltsz = item->offset + gelf_fsize (core, item->type,
item->count ?: 1, EV_CURRENT);
int reps = -1;
do
{
++reps;
desc += eltsz;
descsz -= eltsz;
}
while (descsz >= eltsz && !memcmp (desc, last, eltsz));
if (reps == 1)
{
/* For just one repeat, print it unabridged twice. */
desc -= eltsz;
descsz += eltsz;
}
else if (reps > 1)
printf (gettext ("\n%*s... <repeats %u more times> ..."),
ITEM_INDENT, "", reps);
last = desc;
}
while (descsz > 0);
return colno;
}
static unsigned int
handle_bit_registers (const Ebl_Register_Location *regloc, const void *desc,
unsigned int colno)
{
desc += regloc->offset;
abort (); /* XXX */
return colno;
}
static unsigned int
handle_core_register (Ebl *ebl, Elf *core, int maxregname,
const Ebl_Register_Location *regloc, const void *desc,
unsigned int colno)
{
if (regloc->bits % 8 != 0)
return handle_bit_registers (regloc, desc, colno);
desc += regloc->offset;
for (int reg = regloc->regno; reg < regloc->regno + regloc->count; ++reg)
{
char name[REGNAMESZ];
int bits;
int type;
register_info (ebl, reg, regloc, name, &bits, &type);
#define TYPES \
BITS (8, BYTE, "%4" PRId8, "0x%.2" PRIx8); \
BITS (16, HALF, "%6" PRId16, "0x%.4" PRIx16); \
BITS (32, WORD, "%11" PRId32, " 0x%.8" PRIx32); \
BITS (64, XWORD, "%20" PRId64, " 0x%.16" PRIx64)
#define BITS(bits, xtype, sfmt, ufmt) \
uint##bits##_t b##bits; int##bits##_t b##bits##s
union { TYPES; uint64_t b128[2]; } value;
#undef BITS
switch (type)
{
case DW_ATE_unsigned:
case DW_ATE_signed:
case DW_ATE_address:
switch (bits)
{
#define BITS(bits, xtype, sfmt, ufmt) \
case bits: \
desc = convert (core, ELF_T_##xtype, 1, &value, desc, 0); \
if (type == DW_ATE_signed) \
colno = print_core_item (colno, ' ', WRAP_COLUMN, \
maxregname, name, \
sfmt, value.b##bits##s); \
else \
colno = print_core_item (colno, ' ', WRAP_COLUMN, \
maxregname, name, \
ufmt, value.b##bits); \
break
TYPES;
case 128:
assert (type == DW_ATE_unsigned);
desc = convert (core, ELF_T_XWORD, 2, &value, desc, 0);
int be = elf_getident (core, NULL)[EI_DATA] == ELFDATA2MSB;
colno = print_core_item (colno, ' ', WRAP_COLUMN,
maxregname, name,
"0x%.16" PRIx64 "%.16" PRIx64,
value.b128[!be], value.b128[be]);
break;
default:
abort ();
#undef BITS
}
break;
default:
/* Print each byte in hex, the whole thing in native byte order. */
assert (bits % 8 == 0);
const uint8_t *bytes = desc;
desc += bits / 8;
char hex[bits / 4 + 1];
hex[bits / 4] = '\0';
int incr = 1;
if (elf_getident (core, NULL)[EI_DATA] == ELFDATA2LSB)
{
bytes += bits / 8 - 1;
incr = -1;
}
size_t idx = 0;
for (char *h = hex; bits > 0; bits -= 8, idx += incr)
{
*h++ = "0123456789abcdef"[bytes[idx] >> 4];
*h++ = "0123456789abcdef"[bytes[idx] & 0xf];
}
colno = print_core_item (colno, ' ', WRAP_COLUMN,
maxregname, name, "0x%s", hex);
break;
}
desc += regloc->pad;
#undef TYPES
}
return colno;
}
struct register_info
{
const Ebl_Register_Location *regloc;
const char *set;
char name[REGNAMESZ];
int regno;
int bits;
int type;
};
static int
register_bitpos (const struct register_info *r)
{
return (r->regloc->offset * 8
+ ((r->regno - r->regloc->regno)
* (r->regloc->bits + r->regloc->pad * 8)));
}
static int
compare_sets_by_info (const struct register_info *r1,
const struct register_info *r2)
{
return ((int) r2->bits - (int) r1->bits
?: register_bitpos (r1) - register_bitpos (r2));
}
/* Sort registers by set, and by size and layout offset within each set. */
static int
compare_registers (const void *a, const void *b)
{
const struct register_info *r1 = a;
const struct register_info *r2 = b;
/* Unused elements sort last. */
if (r1->regloc == NULL)
return r2->regloc == NULL ? 0 : 1;
if (r2->regloc == NULL)
return -1;
return ((r1->set == r2->set ? 0 : strcmp (r1->set, r2->set))
?: compare_sets_by_info (r1, r2));
}
/* Sort register sets by layout offset of the first register in the set. */
static int
compare_register_sets (const void *a, const void *b)
{
const struct register_info *const *p1 = a;
const struct register_info *const *p2 = b;
return compare_sets_by_info (*p1, *p2);
}
static unsigned int
handle_core_registers (Ebl *ebl, Elf *core, const void *desc,
const Ebl_Register_Location *reglocs, size_t nregloc)
{
if (nregloc == 0)
return 0;
ssize_t maxnreg = ebl_register_info (ebl, 0, NULL, 0, NULL, NULL, NULL, NULL);
if (maxnreg <= 0)
{
for (size_t i = 0; i < nregloc; ++i)
if (maxnreg < reglocs[i].regno + reglocs[i].count)
maxnreg = reglocs[i].regno + reglocs[i].count;
assert (maxnreg > 0);
}
struct register_info regs[maxnreg];
memset (regs, 0, sizeof regs);
/* Sort to collect the sets together. */
int maxreg = 0;
for (size_t i = 0; i < nregloc; ++i)
for (int reg = reglocs[i].regno;
reg < reglocs[i].regno + reglocs[i].count;
++reg)
{
assert (reg < maxnreg);
if (reg > maxreg)
maxreg = reg;
struct register_info *info = ®s[reg];
info->regloc = ®locs[i];
info->regno = reg;
info->set = register_info (ebl, reg, ®locs[i],
info->name, &info->bits, &info->type);
}
qsort (regs, maxreg + 1, sizeof regs[0], &compare_registers);
/* Collect the unique sets and sort them. */
inline bool same_set (const struct register_info *a,
const struct register_info *b)
{
return (a < ®s[maxnreg] && a->regloc != NULL
&& b < ®s[maxnreg] && b->regloc != NULL
&& a->bits == b->bits
&& (a->set == b->set || !strcmp (a->set, b->set)));
}
struct register_info *sets[maxreg + 1];
sets[0] = ®s[0];
size_t nsets = 1;
for (int i = 1; i <= maxreg; ++i)
if (regs[i].regloc != NULL && !same_set (®s[i], ®s[i - 1]))
sets[nsets++] = ®s[i];
qsort (sets, nsets, sizeof sets[0], &compare_register_sets);
/* Write out all the sets. */
unsigned int colno = 0;
for (size_t i = 0; i < nsets; ++i)
{
/* Find the longest name of a register in this set. */
size_t maxname = 0;
const struct register_info *end;
for (end = sets[i]; same_set (sets[i], end); ++end)
{
size_t len = strlen (end->name);
if (len > maxname)
maxname = len;
}
for (const struct register_info *reg = sets[i];
reg < end;
reg += reg->regloc->count ?: 1)
colno = handle_core_register (ebl, core, maxname,
reg->regloc, desc, colno);
/* Force a line break at the end of the group. */
colno = WRAP_COLUMN;
}
return colno;
}
static void
handle_auxv_note (Ebl *ebl, Elf *core, GElf_Word descsz, GElf_Off desc_pos)
{
Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_AUXV);
if (data == NULL)
elf_error:
error (EXIT_FAILURE, 0,
gettext ("cannot convert core note data: %s"), elf_errmsg (-1));
const size_t nauxv = descsz / gelf_fsize (core, ELF_T_AUXV, 1, EV_CURRENT);
for (size_t i = 0; i < nauxv; ++i)
{
GElf_auxv_t av_mem;
GElf_auxv_t *av = gelf_getauxv (data, i, &av_mem);
if (av == NULL)
goto elf_error;
const char *name;
const char *fmt;
if (ebl_auxv_info (ebl, av->a_type, &name, &fmt) == 0)
{
/* Unknown type. */
if (av->a_un.a_val == 0)
printf (" %" PRIu64 "\n", av->a_type);
else
printf (" %" PRIu64 ": %#" PRIx64 "\n",
av->a_type, av->a_un.a_val);
}
else
switch (fmt[0])
{
case '\0': /* Normally zero. */
if (av->a_un.a_val == 0)
{
printf (" %s\n", name);
break;
}
/* Fall through */
case 'x': /* hex */
case 'p': /* address */
case 's': /* address of string */
printf (" %s: %#" PRIx64 "\n", name, av->a_un.a_val);
break;
case 'u':
printf (" %s: %" PRIu64 "\n", name, av->a_un.a_val);
break;
case 'd':
printf (" %s: %" PRId64 "\n", name, av->a_un.a_val);
break;
case 'b':
printf (" %s: %#" PRIx64 " ", name, av->a_un.a_val);
GElf_Xword bit = 1;
const char *pfx = "<";
for (const char *p = fmt + 1; *p != 0; p = strchr (p, '\0') + 1)
{
if (av->a_un.a_val & bit)
{
printf ("%s%s", pfx, p);
pfx = " ";
}
bit <<= 1;
}
printf (">\n");
break;
default:
abort ();
}
}
}
static bool
buf_has_data (unsigned char const *ptr, unsigned char const *end, size_t sz)
{
return ptr < end && (size_t) (end - ptr) >= sz;
}
static bool
buf_read_int (Elf *core, unsigned char const **ptrp, unsigned char const *end,
int *retp)
{
if (! buf_has_data (*ptrp, end, 4))
return false;
*ptrp = convert (core, ELF_T_WORD, 1, retp, *ptrp, 4);
return true;
}
static bool
buf_read_ulong (Elf *core, unsigned char const **ptrp, unsigned char const *end,
uint64_t *retp)
{
size_t sz = gelf_fsize (core, ELF_T_ADDR, 1, EV_CURRENT);
if (! buf_has_data (*ptrp, end, sz))
return false;
union
{
uint64_t u64;
uint32_t u32;
} u;
*ptrp = convert (core, ELF_T_ADDR, 1, &u, *ptrp, sz);
if (sz == 4)
*retp = u.u32;
else
*retp = u.u64;
return true;
}
static void
handle_siginfo_note (Elf *core, GElf_Word descsz, GElf_Off desc_pos)
{
Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_BYTE);
if (data == NULL)
error (EXIT_FAILURE, 0,
gettext ("cannot convert core note data: %s"), elf_errmsg (-1));
unsigned char const *ptr = data->d_buf;
unsigned char const *const end = data->d_buf + data->d_size;
/* Siginfo head is three ints: signal number, error number, origin
code. */
int si_signo, si_errno, si_code;
if (! buf_read_int (core, &ptr, end, &si_signo)
|| ! buf_read_int (core, &ptr, end, &si_errno)
|| ! buf_read_int (core, &ptr, end, &si_code))
{
fail:
printf (" Not enough data in NT_SIGINFO note.\n");
return;
}
/* Next is a pointer-aligned union of structures. On 64-bit
machines, that implies a word of padding. */
if (gelf_getclass (core) == ELFCLASS64)
ptr += 4;
printf (" si_signo: %d, si_errno: %d, si_code: %d\n",
si_signo, si_errno, si_code);
if (si_code > 0)
switch (si_signo)
{
case SIGILL:
case SIGFPE:
case SIGSEGV:
case SIGBUS:
{
uint64_t addr;
if (! buf_read_ulong (core, &ptr, end, &addr))
goto fail;
printf (" fault address: %#" PRIx64 "\n", addr);
break;
}
default:
;
}
else if (si_code == SI_USER)
{
int pid, uid;
if (! buf_read_int (core, &ptr, end, &pid)
|| ! buf_read_int (core, &ptr, end, &uid))
goto fail;
printf (" sender PID: %d, sender UID: %d\n", pid, uid);
}
}
static void
handle_file_note (Elf *core, GElf_Word descsz, GElf_Off desc_pos)
{
Elf_Data *data = elf_getdata_rawchunk (core, desc_pos, descsz, ELF_T_BYTE);
if (data == NULL)
error (EXIT_FAILURE, 0,
gettext ("cannot convert core note data: %s"), elf_errmsg (-1));
unsigned char const *ptr = data->d_buf;
unsigned char const *const end = data->d_buf + data->d_size;
uint64_t count, page_size;
if (! buf_read_ulong (core, &ptr, end, &count)
|| ! buf_read_ulong (core, &ptr, end, &page_size))
{
fail:
printf (" Not enough data in NT_FILE note.\n");
return;
}
size_t addrsize = gelf_fsize (core, ELF_T_ADDR, 1, EV_CURRENT);
uint64_t maxcount = (size_t) (end - ptr) / (3 * addrsize);
if (count > maxcount)
goto fail;
/* Where file names are stored. */
unsigned char const *const fstart = ptr + 3 * count * addrsize;
char const *fptr = (char *) fstart;
printf (" %" PRId64 " files:\n", count);
for (uint64_t i = 0; i < count; ++i)
{
uint64_t mstart, mend, moffset;
if (! buf_read_ulong (core, &ptr, fstart, &mstart)
|| ! buf_read_ulong (core, &ptr, fstart, &mend)
|| ! buf_read_ulong (core, &ptr, fstart, &moffset))
goto fail;
const char *fnext = memchr (fptr, '\0', (char *) end - fptr);
if (fnext == NULL)
goto fail;
int ct = printf (" %08" PRIx64 "-%08" PRIx64
" %08" PRIx64 " %" PRId64,
mstart, mend, moffset * page_size, mend - mstart);
printf ("%*s%s\n", ct > 50 ? 3 : 53 - ct, "", fptr);
fptr = fnext + 1;
}
}
static void
handle_core_note (Ebl *ebl, const GElf_Nhdr *nhdr,
const char *name, const void *desc)
{
GElf_Word regs_offset;
size_t nregloc;
const Ebl_Register_Location *reglocs;
size_t nitems;
const Ebl_Core_Item *items;
if (! ebl_core_note (ebl, nhdr, name,
®s_offset, &nregloc, ®locs, &nitems, &items))
return;
/* Pass 0 for DESCSZ when there are registers in the note,
so that the ITEMS array does not describe the whole thing.
For non-register notes, the actual descsz might be a multiple
of the unit size, not just exactly the unit size. */
unsigned int colno = handle_core_items (ebl->elf, desc,
nregloc == 0 ? nhdr->n_descsz : 0,
items, nitems);
if (colno != 0)
putchar_unlocked ('\n');
colno = handle_core_registers (ebl, ebl->elf, desc + regs_offset,
reglocs, nregloc);
if (colno != 0)
putchar_unlocked ('\n');
}
static void
handle_notes_data (Ebl *ebl, const GElf_Ehdr *ehdr,
GElf_Off start, Elf_Data *data)
{
fputs_unlocked (gettext (" Owner Data size Type\n"), stdout);
if (data == NULL)
goto bad_note;
size_t offset = 0;
GElf_Nhdr nhdr;
size_t name_offset;
size_t desc_offset;
while (offset < data->d_size
&& (offset = gelf_getnote (data, offset,
&nhdr, &name_offset, &desc_offset)) > 0)
{
const char *name = data->d_buf + name_offset;
const char *desc = data->d_buf + desc_offset;
char buf[100];
char buf2[100];
printf (gettext (" %-13.*s %9" PRId32 " %s\n"),
(int) nhdr.n_namesz, name, nhdr.n_descsz,
ehdr->e_type == ET_CORE
? ebl_core_note_type_name (ebl, nhdr.n_type,
buf, sizeof (buf))
: ebl_object_note_type_name (ebl, name, nhdr.n_type,
buf2, sizeof (buf2)));
/* Filter out invalid entries. */
if (memchr (name, '\0', nhdr.n_namesz) != NULL
/* XXX For now help broken Linux kernels. */
|| 1)
{
if (ehdr->e_type == ET_CORE)
{
if (nhdr.n_type == NT_AUXV
&& (nhdr.n_namesz == 4 /* Broken old Linux kernels. */
|| (nhdr.n_namesz == 5 && name[4] == '\0'))
&& !memcmp (name, "CORE", 4))
handle_auxv_note (ebl, ebl->elf, nhdr.n_descsz,
start + desc_offset);
else if (nhdr.n_namesz == 5 && strcmp (name, "CORE") == 0)
switch (nhdr.n_type)
{
case NT_SIGINFO:
handle_siginfo_note (ebl->elf, nhdr.n_descsz,
start + desc_offset);
break;
case NT_FILE:
handle_file_note (ebl->elf, nhdr.n_descsz,
start + desc_offset);
break;
default:
handle_core_note (ebl, &nhdr, name, desc);
}
else
handle_core_note (ebl, &nhdr, name, desc);
}
else
ebl_object_note (ebl, name, nhdr.n_type, nhdr.n_descsz, desc);
}
}
if (offset == data->d_size)
return;
bad_note:
error (EXIT_FAILURE, 0,
gettext ("cannot get content of note section: %s"),
elf_errmsg (-1));
}
static void
handle_notes (Ebl *ebl, GElf_Ehdr *ehdr)
{
/* If we have section headers, just look for SHT_NOTE sections.
In a debuginfo file, the program headers are not reliable. */
if (shnum != 0)
{
/* Get the section header string table index. */
size_t shstrndx;
if (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0)
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
Elf_Scn *scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
GElf_Shdr shdr_mem;
GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
if (shdr == NULL || shdr->sh_type != SHT_NOTE)
/* Not what we are looking for. */
continue;
printf (gettext ("\
\nNote section [%2zu] '%s' of %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"),
elf_ndxscn (scn),
elf_strptr (ebl->elf, shstrndx, shdr->sh_name),
shdr->sh_size, shdr->sh_offset);
handle_notes_data (ebl, ehdr, shdr->sh_offset,
elf_getdata (scn, NULL));
}
return;
}
/* We have to look through the program header to find the note
sections. There can be more than one. */
for (size_t cnt = 0; cnt < phnum; ++cnt)
{
GElf_Phdr mem;
GElf_Phdr *phdr = gelf_getphdr (ebl->elf, cnt, &mem);
if (phdr == NULL || phdr->p_type != PT_NOTE)
/* Not what we are looking for. */
continue;
printf (gettext ("\
\nNote segment of %" PRIu64 " bytes at offset %#0" PRIx64 ":\n"),
phdr->p_filesz, phdr->p_offset);
handle_notes_data (ebl, ehdr, phdr->p_offset,
elf_getdata_rawchunk (ebl->elf,
phdr->p_offset, phdr->p_filesz,
ELF_T_NHDR));
}
}
static void
hex_dump (const uint8_t *data, size_t len)
{
size_t pos = 0;
while (pos < len)
{
printf (" 0x%08zx ", pos);
const size_t chunk = MIN (len - pos, 16);
for (size_t i = 0; i < chunk; ++i)
if (i % 4 == 3)
printf ("%02x ", data[pos + i]);
else
printf ("%02x", data[pos + i]);
if (chunk < 16)
printf ("%*s", (int) ((16 - chunk) * 2 + (16 - chunk + 3) / 4), "");
for (size_t i = 0; i < chunk; ++i)
{
unsigned char b = data[pos + i];
printf ("%c", isprint (b) ? b : '.');
}
putchar ('\n');
pos += chunk;
}
}
static void
dump_data_section (Elf_Scn *scn, const GElf_Shdr *shdr, const char *name)
{
if (shdr->sh_size == 0 || shdr->sh_type == SHT_NOBITS)
printf (gettext ("\nSection [%zu] '%s' has no data to dump.\n"),
elf_ndxscn (scn), name);
else
{
if (print_decompress)
{
/* We try to decompress the section, but keep the old shdr around
so we can show both the original shdr size and the uncompressed
data size. */
if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
elf_compress (scn, 0, 0);
else if (strncmp (name, ".zdebug", strlen (".zdebug")) == 0)
elf_compress_gnu (scn, 0, 0);
}
Elf_Data *data = elf_rawdata (scn, NULL);
if (data == NULL)
error (0, 0, gettext ("cannot get data for section [%zu] '%s': %s"),
elf_ndxscn (scn), name, elf_errmsg (-1));
else
{
if (data->d_size == shdr->sh_size)
printf (gettext ("\nHex dump of section [%zu] '%s', %" PRIu64
" bytes at offset %#0" PRIx64 ":\n"),
elf_ndxscn (scn), name,
shdr->sh_size, shdr->sh_offset);
else
printf (gettext ("\nHex dump of section [%zu] '%s', %" PRIu64
" bytes (%zd uncompressed) at offset %#0"
PRIx64 ":\n"),
elf_ndxscn (scn), name,
shdr->sh_size, data->d_size, shdr->sh_offset);
hex_dump (data->d_buf, data->d_size);
}
}
}
static void
print_string_section (Elf_Scn *scn, const GElf_Shdr *shdr, const char *name)
{
if (shdr->sh_size == 0 || shdr->sh_type == SHT_NOBITS)
printf (gettext ("\nSection [%zu] '%s' has no strings to dump.\n"),
elf_ndxscn (scn), name);
else
{
if (print_decompress)
{
/* We try to decompress the section, but keep the old shdr around
so we can show both the original shdr size and the uncompressed
data size. */
if ((shdr->sh_flags & SHF_COMPRESSED) != 0)
elf_compress (scn, 0, 0);
else if (strncmp (name, ".zdebug", strlen (".zdebug")) == 0)
elf_compress_gnu (scn, 0, 0);
}
Elf_Data *data = elf_rawdata (scn, NULL);
if (data == NULL)
error (0, 0, gettext ("cannot get data for section [%zu] '%s': %s"),
elf_ndxscn (scn), name, elf_errmsg (-1));
else
{
if (data->d_size == shdr->sh_size)
printf (gettext ("\nString section [%zu] '%s' contains %" PRIu64
" bytes at offset %#0" PRIx64 ":\n"),
elf_ndxscn (scn), name,
shdr->sh_size, shdr->sh_offset);
else
printf (gettext ("\nString section [%zu] '%s' contains %" PRIu64
" bytes (%zd uncompressed) at offset %#0"
PRIx64 ":\n"),
elf_ndxscn (scn), name,
shdr->sh_size, data->d_size, shdr->sh_offset);
const char *start = data->d_buf;
const char *const limit = start + data->d_size;
do
{
const char *end = memchr (start, '\0', limit - start);
const size_t pos = start - (const char *) data->d_buf;
if (unlikely (end == NULL))
{
printf (" [%6zx]- %.*s\n",
pos, (int) (limit - start), start);
break;
}
printf (" [%6zx] %s\n", pos, start);
start = end + 1;
} while (start < limit);
}
}
}
static void
for_each_section_argument (Elf *elf, const struct section_argument *list,
void (*dump) (Elf_Scn *scn, const GElf_Shdr *shdr,
const char *name))
{
/* Get the section header string table index. */
size_t shstrndx;
if (elf_getshdrstrndx (elf, &shstrndx) < 0)
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
for (const struct section_argument *a = list; a != NULL; a = a->next)
{
Elf_Scn *scn;
GElf_Shdr shdr_mem;
const char *name = NULL;
char *endp = NULL;
unsigned long int shndx = strtoul (a->arg, &endp, 0);
if (endp != a->arg && *endp == '\0')
{
scn = elf_getscn (elf, shndx);
if (scn == NULL)
{
error (0, 0, gettext ("\nsection [%lu] does not exist"), shndx);
continue;
}
if (gelf_getshdr (scn, &shdr_mem) == NULL)
error (EXIT_FAILURE, 0, gettext ("cannot get section header: %s"),
elf_errmsg (-1));
name = elf_strptr (elf, shstrndx, shdr_mem.sh_name);
}
else
{
/* Need to look up the section by name. */
scn = NULL;
bool found = false;
while ((scn = elf_nextscn (elf, scn)) != NULL)
{
if (gelf_getshdr (scn, &shdr_mem) == NULL)
continue;
name = elf_strptr (elf, shstrndx, shdr_mem.sh_name);
if (name == NULL)
continue;
if (!strcmp (name, a->arg))
{
found = true;
(*dump) (scn, &shdr_mem, name);
}
}
if (unlikely (!found) && !a->implicit)
error (0, 0, gettext ("\nsection '%s' does not exist"), a->arg);
}
}
}
static void
dump_data (Ebl *ebl)
{
for_each_section_argument (ebl->elf, dump_data_sections, &dump_data_section);
}
static void
dump_strings (Ebl *ebl)
{
for_each_section_argument (ebl->elf, string_sections, &print_string_section);
}
static void
print_strings (Ebl *ebl)
{
/* Get the section header string table index. */
size_t shstrndx;
if (unlikely (elf_getshdrstrndx (ebl->elf, &shstrndx) < 0))
error (EXIT_FAILURE, 0,
gettext ("cannot get section header string table index"));
Elf_Scn *scn;
GElf_Shdr shdr_mem;
const char *name;
scn = NULL;
while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
{
if (gelf_getshdr (scn, &shdr_mem) == NULL)
continue;
if (shdr_mem.sh_type != SHT_PROGBITS
|| !(shdr_mem.sh_flags & SHF_STRINGS))
continue;
name = elf_strptr (ebl->elf, shstrndx, shdr_mem.sh_name);
if (name == NULL)
continue;
print_string_section (scn, &shdr_mem, name);
}
}
static void
dump_archive_index (Elf *elf, const char *fname)
{
size_t narsym;
const Elf_Arsym *arsym = elf_getarsym (elf, &narsym);
if (arsym == NULL)
{
int result = elf_errno ();
if (unlikely (result != ELF_E_NO_INDEX))
error (EXIT_FAILURE, 0,
gettext ("cannot get symbol index of archive '%s': %s"),
fname, elf_errmsg (result));
else
printf (gettext ("\nArchive '%s' has no symbol index\n"), fname);
return;
}
printf (gettext ("\nIndex of archive '%s' has %zu entries:\n"),
fname, narsym);
size_t as_off = 0;
for (const Elf_Arsym *s = arsym; s < &arsym[narsym - 1]; ++s)
{
if (s->as_off != as_off)
{
as_off = s->as_off;
Elf *subelf = NULL;
if (unlikely (elf_rand (elf, as_off) == 0)
|| unlikely ((subelf = elf_begin (-1, ELF_C_READ_MMAP, elf))
== NULL))
#if __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 7)
while (1)
#endif
error (EXIT_FAILURE, 0,
gettext ("cannot extract member at offset %zu in '%s': %s"),
as_off, fname, elf_errmsg (-1));
const Elf_Arhdr *h = elf_getarhdr (subelf);
printf (gettext ("Archive member '%s' contains:\n"), h->ar_name);
elf_end (subelf);
}
printf ("\t%s\n", s->as_name);
}
}
#include "debugpred.h"