1b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper/* Get section at specific index. 21ccdfb683ad6c7e59793136c3a657ddf131cafd1Mark Wielaard Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2015 Red Hat, Inc. 3de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard This file is part of elfutils. 4b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. 5b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 6de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard This file is free software; you can redistribute it and/or modify 7de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard it under the terms of either 8b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 9de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard * the GNU Lesser General Public License as published by the Free 10de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard Software Foundation; either version 3 of the License, or (at 11de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard your option) any later version 12de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 13de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard or 14de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 15de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard * the GNU General Public License as published by the Free 16de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard Software Foundation; either version 2 of the License, or (at 17de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard your option) any later version 18de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 19de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard or both in parallel, as here. 20de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard 21de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard elfutils is distributed in the hope that it will be useful, but 22361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper WITHOUT ANY WARRANTY; without even the implied warranty of 23361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 24361df7da6dfecd817b27e62b91752ac316d7cdd4Ulrich Drepper General Public License for more details. 25b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 26de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard You should have received copies of the GNU General Public License and 27de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard the GNU Lesser General Public License along with this program. If 28de2ed97f33139af5c7a0811e4ec66fc896a13cf2Mark Wielaard not, see <http://www.gnu.org/licenses/>. */ 29b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 30b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#ifdef HAVE_CONFIG_H 31b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper# include <config.h> 32b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#endif 33b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 34b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <assert.h> 35b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <stddef.h> 36b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include <stdlib.h> 37b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 38b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper#include "libelfP.h" 39b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 40b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 41b08d5a8fb42f4586d756068065186b5af7e48daUlrich DrepperElf_Scn * 421ccdfb683ad6c7e59793136c3a657ddf131cafd1Mark Wielaardelf_getscn (Elf *elf, size_t idx) 43b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper{ 44b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (elf == NULL) 45b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return NULL; 46b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 47b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (unlikely (elf->kind != ELF_K_ELF)) 48b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 49b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libelf_seterrno (ELF_E_INVALID_HANDLE); 50b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return NULL; 51b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 52b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 53b4d6f0f8064f2b706ea9035ef0393d8299671390Roland McGrath rwlock_rdlock (elf->lock); 54b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 55b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Elf_Scn *result = NULL; 56b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 57b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper /* Find the section in the list. */ 58b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper Elf_ScnList *runp = (elf->class == ELFCLASS32 59b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper || (offsetof (struct Elf, state.elf32.scns) 60b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper == offsetof (struct Elf, state.elf64.scns)) 61b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper ? &elf->state.elf32.scns : &elf->state.elf64.scns); 62b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper while (1) 63b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 64b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (idx < runp->max) 65b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 66b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (idx < runp->cnt) 67b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper result = &runp->data[idx]; 68b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper else 69b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libelf_seterrno (ELF_E_INVALID_INDEX); 70b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper break; 71b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 72b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 73b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper idx -= runp->max; 74b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 75b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper runp = runp->next; 76b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper if (runp == NULL) 77b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper { 78b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper __libelf_seterrno (ELF_E_INVALID_INDEX); 79b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper break; 80b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 81b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper } 82b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 83b4d6f0f8064f2b706ea9035ef0393d8299671390Roland McGrath rwlock_unlock (elf->lock); 84b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper 85b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper return result; 86b08d5a8fb42f4586d756068065186b5af7e48daUlrich Drepper} 87b08d5a8fb42f4586d756068065186b5af7e48daUlrich DrepperINTDEF(elf_getscn) 88