/* Get ELF program header table. Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Red Hat, Inc. Written by Ulrich Drepper <drepper@redhat.com>, 1998. This program 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, version 2. This program 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <stdlib.h> #include <unistd.h> #include "libelfP.h" #include "common.h" #ifndef LIBELFBITS # define LIBELFBITS 32 #endif ElfW2(LIBELFBITS,Phdr) * elfw2(LIBELFBITS,getphdr) (elf) Elf *elf; { ElfW2(LIBELFBITS,Phdr) *result; if (elf == NULL) return NULL; if (unlikely (elf->kind != ELF_K_ELF)) { __libelf_seterrno (ELF_E_INVALID_HANDLE); return NULL; } /* If the program header entry has already been filled in the code below must already have been run. So the class is set, too. No need to waste any more time here. */ result = elf->state.ELFW(elf,LIBELFBITS).phdr; if (likely (result != NULL)) return result; rwlock_wrlock (elf->lock); if (elf->class == 0) elf->class = ELFW(ELFCLASS,LIBELFBITS); else if (elf->class != ELFW(ELFCLASS,LIBELFBITS)) { __libelf_seterrno (ELF_E_INVALID_CLASS); result = NULL; goto out; } if (likely (result == NULL)) { /* Read the section header table. */ ElfW2(LIBELFBITS,Ehdr) *ehdr = elf->state.ELFW(elf,LIBELFBITS).ehdr; size_t phnum; size_t size; /* If no program header exists return NULL. */ phnum = ehdr->e_phnum; if (phnum == 0) { __libelf_seterrno (ELF_E_NO_PHDR); goto out; } size = phnum * sizeof (ElfW2(LIBELFBITS,Phdr)); if (elf->map_address != NULL) { /* All the data is already mapped. Use it. */ if (ehdr->e_ident[EI_DATA] == MY_ELFDATA && (ALLOW_UNALIGNED || (ehdr->e_phoff & (__alignof__ (ElfW2(LIBELFBITS,Phdr)) - 1)) == 0)) /* Simply use the mapped data. */ elf->state.ELFW(elf,LIBELFBITS).phdr = (ElfW2(LIBELFBITS,Phdr) *) ((char *) elf->map_address + elf->start_offset + ehdr->e_phoff); else { size_t cnt; ElfW2(LIBELFBITS,Phdr) *notcvt; ElfW2(LIBELFBITS,Phdr) *phdr; /* Allocate memory for the program headers. We know the number of entries from the ELF header. */ phdr = elf->state.ELFW(elf,LIBELFBITS).phdr = (ElfW2(LIBELFBITS,Phdr) *) malloc (size); if (elf->state.ELFW(elf,LIBELFBITS).phdr == NULL) { __libelf_seterrno (ELF_E_NOMEM); goto out; } elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_MALLOCED | ELF_F_DIRTY; /* Now copy the data and at the same time convert the byte order. */ if (ALLOW_UNALIGNED || (ehdr->e_phoff & (__alignof__ (ElfW2(LIBELFBITS,Phdr)) - 1)) == 0) notcvt = (ElfW2(LIBELFBITS,Phdr) *) ((char *) elf->map_address + elf->start_offset + ehdr->e_phoff); else { notcvt = (ElfW2(LIBELFBITS,Phdr) *) alloca (size); memcpy (notcvt, ((char *) elf->map_address + elf->start_offset + ehdr->e_phoff), size); } for (cnt = 0; cnt < phnum; ++cnt) { CONVERT_TO (phdr[cnt].p_type, notcvt[cnt].p_type); CONVERT_TO (phdr[cnt].p_offset, notcvt[cnt].p_offset); CONVERT_TO (phdr[cnt].p_vaddr, notcvt[cnt].p_vaddr); CONVERT_TO (phdr[cnt].p_paddr, notcvt[cnt].p_paddr); CONVERT_TO (phdr[cnt].p_filesz, notcvt[cnt].p_filesz); CONVERT_TO (phdr[cnt].p_memsz, notcvt[cnt].p_memsz); CONVERT_TO (phdr[cnt].p_flags, notcvt[cnt].p_flags); CONVERT_TO (phdr[cnt].p_align, notcvt[cnt].p_align); } } } else if (likely (elf->fildes != -1)) { /* Allocate memory for the program headers. We know the number of entries from the ELF header. */ elf->state.ELFW(elf,LIBELFBITS).phdr = (ElfW2(LIBELFBITS,Phdr) *) malloc (size); if (elf->state.ELFW(elf,LIBELFBITS).phdr == NULL) { __libelf_seterrno (ELF_E_NOMEM); goto out; } elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_MALLOCED; /* Read the header. */ if ((size_t) pread (elf->fildes, elf->state.ELFW(elf,LIBELFBITS).phdr, size, (elf->start_offset + ehdr->e_phoff)) != size) { /* Severe problems. We cannot read the data. */ __libelf_seterrno (ELF_E_READ_ERROR); free (elf->state.ELFW(elf,LIBELFBITS).phdr); elf->state.ELFW(elf,LIBELFBITS).phdr = NULL; goto out; } /* If the byte order of the file is not the same as the one of the host convert the data now. */ if (ehdr->e_ident[EI_DATA] != MY_ELFDATA) { ElfW2(LIBELFBITS,Phdr) *phdr; size_t cnt; phdr = elf->state.ELFW(elf,LIBELFBITS).phdr; for (cnt = 0; cnt < phnum; ++cnt) { CONVERT (phdr[cnt].p_type); CONVERT (phdr[cnt].p_offset); CONVERT (phdr[cnt].p_vaddr); CONVERT (phdr[cnt].p_paddr); CONVERT (phdr[cnt].p_filesz); CONVERT (phdr[cnt].p_memsz); CONVERT (phdr[cnt].p_flags); CONVERT (phdr[cnt].p_align); } } } else { /* The file descriptor was already enabled and not all data was read. */ __libelf_seterrno (ELF_E_FD_DISABLED); goto out; } result = elf->state.ELFW(elf,LIBELFBITS).phdr; } out: rwlock_unlock (elf->lock); return result; } INTDEF(elfw2(LIBELFBITS,getphdr))