/* * Copyright (C) 2008 The Android Open Source Project * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _LINKER_H_ #define _LINKER_H_ #include <unistd.h> #include <sys/types.h> #include <linux/elf.h> #undef PAGE_MASK #undef PAGE_SIZE #define PAGE_SIZE 4096 #define PAGE_MASK 4095 void debugger_init(); const char *addr_to_name(unsigned addr); /* magic shared structures that GDB knows about */ struct link_map { uintptr_t l_addr; char * l_name; uintptr_t l_ld; struct link_map * l_next; struct link_map * l_prev; }; /* needed for dl_iterate_phdr to be passed to the callbacks provided */ struct dl_phdr_info { Elf32_Addr dlpi_addr; const char *dlpi_name; const Elf32_Phdr *dlpi_phdr; Elf32_Half dlpi_phnum; }; // Values for r_debug->state enum { RT_CONSISTENT, RT_ADD, RT_DELETE }; struct r_debug { int32_t r_version; struct link_map * r_map; void (*r_brk)(void); int32_t r_state; uintptr_t r_ldbase; }; typedef struct soinfo soinfo; #define FLAG_LINKED 0x00000001 #define FLAG_ERROR 0x00000002 #define FLAG_EXE 0x00000004 // The main executable #define FLAG_PRELINKED 0x00000008 // This is a pre-linked lib #define SOINFO_NAME_LEN 128 struct soinfo { const char name[SOINFO_NAME_LEN]; Elf32_Phdr *phdr; int phnum; unsigned entry; unsigned base; unsigned size; // buddy-allocator index, negative for prelinked libraries int ba_index; unsigned *dynamic; unsigned wrprotect_start; unsigned wrprotect_end; soinfo *next; unsigned flags; const char *strtab; Elf32_Sym *symtab; unsigned nbucket; unsigned nchain; unsigned *bucket; unsigned *chain; unsigned *plt_got; Elf32_Rel *plt_rel; unsigned plt_rel_count; Elf32_Rel *rel; unsigned rel_count; unsigned *preinit_array; unsigned preinit_array_count; unsigned *init_array; unsigned init_array_count; unsigned *fini_array; unsigned fini_array_count; void (*init_func)(void); void (*fini_func)(void); #ifdef ANDROID_ARM_LINKER /* ARM EABI section used for stack unwinding. */ unsigned *ARM_exidx; unsigned ARM_exidx_count; #endif unsigned refcount; struct link_map linkmap; }; extern soinfo libdl_info; /* these must all be powers of two */ #define LIBBASE 0x80000000 #define LIBLAST 0x90000000 #define LIBINC 0x00100000 #ifdef ANDROID_ARM_LINKER #define R_ARM_COPY 20 #define R_ARM_GLOB_DAT 21 #define R_ARM_JUMP_SLOT 22 #define R_ARM_RELATIVE 23 #elif defined(ANDROID_X86_LINKER) #define R_386_32 1 #define R_386_PC32 2 #define R_386_GLOB_DAT 6 #define R_386_JUMP_SLOT 7 #define R_386_RELATIVE 8 #endif /* ANDROID_*_LINKER */ #ifndef DT_INIT_ARRAY #define DT_INIT_ARRAY 25 #endif #ifndef DT_FINI_ARRAY #define DT_FINI_ARRAY 26 #endif #ifndef DT_INIT_ARRAYSZ #define DT_INIT_ARRAYSZ 27 #endif #ifndef DT_FINI_ARRAYSZ #define DT_FINI_ARRAYSZ 28 #endif #ifndef DT_PREINIT_ARRAY #define DT_PREINIT_ARRAY 32 #endif #ifndef DT_PREINIT_ARRAYSZ #define DT_PREINIT_ARRAYSZ 33 #endif /* in theory we only need the above relative relocations, but in practice the following one turns up from time to time. fushigi na. */ #define R_ARM_ABS32 2 soinfo *find_library(const char *name); unsigned unload_library(soinfo *si); Elf32_Sym *lookup_in_library(soinfo *si, const char *name); Elf32_Sym *lookup(const char *name, unsigned *base); const char *linker_get_error(void); #ifdef ANDROID_ARM_LINKER typedef long unsigned int *_Unwind_Ptr; _Unwind_Ptr dl_unwind_find_exidx(_Unwind_Ptr pc, int *pcount); #elif defined(ANDROID_X86_LINKER) int dl_iterate_phdr(int (*cb)(struct dl_phdr_info *, size_t, void *), void *); #endif #endif