125b3c049e70834cf33790a28643ab058b507b35cBen Cheng/* Read all of the file associated with the descriptor. 225b3c049e70834cf33790a28643ab058b507b35cBen Cheng Copyright (C) 1998-2009 Red Hat, Inc. 303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is part of elfutils. 425b3c049e70834cf33790a28643ab058b507b35cBen Cheng Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. 525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is free software; you can redistribute it and/or modify 703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes it under the terms of either 825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU Lesser General Public License as published by the Free 1003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 3 of the License, or (at 1103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or 1403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU General Public License as published by the Free 1603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 2 of the License, or (at 1703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or both in parallel, as here. 2003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elfutils is distributed in the hope that it will be useful, but 2225b3c049e70834cf33790a28643ab058b507b35cBen Cheng WITHOUT ANY WARRANTY; without even the implied warranty of 2325b3c049e70834cf33790a28643ab058b507b35cBen Cheng MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 2425b3c049e70834cf33790a28643ab058b507b35cBen Cheng General Public License for more details. 2525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 2603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes You should have received copies of the GNU General Public License and 2703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes the GNU Lesser General Public License along with this program. If 2803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes not, see <http://www.gnu.org/licenses/>. */ 2925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#ifdef HAVE_CONFIG_H 3125b3c049e70834cf33790a28643ab058b507b35cBen Cheng# include <config.h> 3225b3c049e70834cf33790a28643ab058b507b35cBen Cheng#endif 3325b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3425b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <errno.h> 3525b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <unistd.h> 3625b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <sys/stat.h> 3725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 3825b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include <system.h> 3925b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "libelfP.h" 4025b3c049e70834cf33790a28643ab058b507b35cBen Cheng#include "common.h" 4125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4225b3c049e70834cf33790a28643ab058b507b35cBen Cheng 4325b3c049e70834cf33790a28643ab058b507b35cBen Chengstatic void 4425b3c049e70834cf33790a28643ab058b507b35cBen Chengset_address (Elf *elf, size_t offset) 4525b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 4625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->kind == ELF_K_AR) 4725b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 4825b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf *child = elf->state.ar.children; 4925b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5025b3c049e70834cf33790a28643ab058b507b35cBen Cheng while (child != NULL) 5125b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 5225b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (child->map_address == NULL) 5325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 5425b3c049e70834cf33790a28643ab058b507b35cBen Cheng child->map_address = elf->map_address; 5525b3c049e70834cf33790a28643ab058b507b35cBen Cheng child->start_offset -= offset; 5625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (child->kind == ELF_K_AR) 5725b3c049e70834cf33790a28643ab058b507b35cBen Cheng child->state.ar.offset -= offset; 5825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 5925b3c049e70834cf33790a28643ab058b507b35cBen Cheng set_address (child, offset); 6025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 6125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6225b3c049e70834cf33790a28643ab058b507b35cBen Cheng child = child->next; 6325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 6425b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 6525b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 6625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6725b3c049e70834cf33790a28643ab058b507b35cBen Cheng 6825b3c049e70834cf33790a28643ab058b507b35cBen Chengchar * 6925b3c049e70834cf33790a28643ab058b507b35cBen Cheng__libelf_readall (elf) 7025b3c049e70834cf33790a28643ab058b507b35cBen Cheng Elf *elf; 7125b3c049e70834cf33790a28643ab058b507b35cBen Cheng{ 7225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Get the file. */ 7325b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_wrlock (elf->lock); 7425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 7525b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->map_address == NULL && unlikely (elf->fildes == -1)) 7625b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 7725b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_INVALID_HANDLE); 7825b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_unlock (elf->lock); 7925b3c049e70834cf33790a28643ab058b507b35cBen Cheng return NULL; 8025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 8125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* If the file is not mmap'ed and not previously loaded, do it now. */ 8325b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->map_address == NULL) 8425b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 8525b3c049e70834cf33790a28643ab058b507b35cBen Cheng char *mem = NULL; 8625b3c049e70834cf33790a28643ab058b507b35cBen Cheng 8725b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* If this is an archive and we have derived descriptors get the 8825b3c049e70834cf33790a28643ab058b507b35cBen Cheng locks for all of them. */ 8925b3c049e70834cf33790a28643ab058b507b35cBen Cheng libelf_acquire_all (elf); 9025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->maximum_size == ~((size_t) 0)) 9225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 9325b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* We don't yet know how large the file is. Determine that now. */ 9425b3c049e70834cf33790a28643ab058b507b35cBen Cheng struct stat st; 9525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9625b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (fstat (elf->fildes, &st) < 0) 9725b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto read_error; 9825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 9925b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (sizeof (size_t) >= sizeof (st.st_size) 10025b3c049e70834cf33790a28643ab058b507b35cBen Cheng || st.st_size <= ~((size_t) 0)) 10125b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->maximum_size = (size_t) st.st_size; 10225b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 10325b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 10425b3c049e70834cf33790a28643ab058b507b35cBen Cheng errno = EOVERFLOW; 10525b3c049e70834cf33790a28643ab058b507b35cBen Cheng goto read_error; 10625b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 10825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 10925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Allocate all the memory we need. */ 11025b3c049e70834cf33790a28643ab058b507b35cBen Cheng mem = (char *) malloc (elf->maximum_size); 11125b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (mem != NULL) 11225b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11325b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Read the file content. */ 11425b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (unlikely ((size_t) pread_retry (elf->fildes, mem, 11525b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->maximum_size, 11625b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->start_offset) 11725b3c049e70834cf33790a28643ab058b507b35cBen Cheng != elf->maximum_size)) 11825b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 11925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Something went wrong. */ 12025b3c049e70834cf33790a28643ab058b507b35cBen Cheng read_error: 12125b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_READ_ERROR); 12225b3c049e70834cf33790a28643ab058b507b35cBen Cheng free (mem); 12325b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 12425b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 12525b3c049e70834cf33790a28643ab058b507b35cBen Cheng { 12625b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Remember the address. */ 12725b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->map_address = mem; 12825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 12925b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Also remember that we allocated the memory. */ 13025b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->flags |= ELF_F_MALLOCED; 13125b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13225b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Propagate the information down to all children and 13325b3c049e70834cf33790a28643ab058b507b35cBen Cheng their children. */ 13425b3c049e70834cf33790a28643ab058b507b35cBen Cheng set_address (elf, elf->start_offset); 13525b3c049e70834cf33790a28643ab058b507b35cBen Cheng 13625b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Correct the own offsets. */ 13725b3c049e70834cf33790a28643ab058b507b35cBen Cheng if (elf->kind == ELF_K_AR) 13825b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->state.ar.offset -= elf->start_offset; 13925b3c049e70834cf33790a28643ab058b507b35cBen Cheng elf->start_offset = 0; 14025b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 14125b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 14225b3c049e70834cf33790a28643ab058b507b35cBen Cheng else 14325b3c049e70834cf33790a28643ab058b507b35cBen Cheng __libelf_seterrno (ELF_E_NOMEM); 14425b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14525b3c049e70834cf33790a28643ab058b507b35cBen Cheng /* Free the locks on the children. */ 14625b3c049e70834cf33790a28643ab058b507b35cBen Cheng libelf_release_all (elf); 14725b3c049e70834cf33790a28643ab058b507b35cBen Cheng } 14825b3c049e70834cf33790a28643ab058b507b35cBen Cheng 14925b3c049e70834cf33790a28643ab058b507b35cBen Cheng rwlock_unlock (elf->lock); 15025b3c049e70834cf33790a28643ab058b507b35cBen Cheng 15125b3c049e70834cf33790a28643ab058b507b35cBen Cheng return (char *) elf->map_address; 15225b3c049e70834cf33790a28643ab058b507b35cBen Cheng} 153