The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 1 | /* Return string pointer from string section. |
Ben Cheng | cc6695e | 2012-03-07 23:04:02 -0800 | [diff] [blame^] | 2 | Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2008 Red Hat, Inc. |
| 3 | This file is part of Red Hat elfutils. |
The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 4 | Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Ben Cheng | cc6695e | 2012-03-07 23:04:02 -0800 | [diff] [blame^] | 6 | Red Hat elfutils is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by the |
| 8 | Free Software Foundation; version 2 of the License. |
The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 9 | |
Ben Cheng | cc6695e | 2012-03-07 23:04:02 -0800 | [diff] [blame^] | 10 | Red Hat elfutils is distributed in the hope that it will be useful, but |
| 11 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | General Public License for more details. |
The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 14 | |
Ben Cheng | cc6695e | 2012-03-07 23:04:02 -0800 | [diff] [blame^] | 15 | You should have received a copy of the GNU General Public License along |
| 16 | with Red Hat elfutils; if not, write to the Free Software Foundation, |
| 17 | Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. |
| 18 | |
| 19 | In addition, as a special exception, Red Hat, Inc. gives You the |
| 20 | additional right to link the code of Red Hat elfutils with code licensed |
| 21 | under any Open Source Initiative certified open source license |
| 22 | (http://www.opensource.org/licenses/index.php) which requires the |
| 23 | distribution of source code with any binary distribution and to |
| 24 | distribute linked combinations of the two. Non-GPL Code permitted under |
| 25 | this exception must only link to the code of Red Hat elfutils through |
| 26 | those well defined interfaces identified in the file named EXCEPTION |
| 27 | found in the source code files (the "Approved Interfaces"). The files |
| 28 | of Non-GPL Code may instantiate templates or use macros or inline |
| 29 | functions from the Approved Interfaces without causing the resulting |
| 30 | work to be covered by the GNU General Public License. Only Red Hat, |
| 31 | Inc. may make changes or additions to the list of Approved Interfaces. |
| 32 | Red Hat's grant of this exception is conditioned upon your not adding |
| 33 | any new exceptions. If you wish to add a new Approved Interface or |
| 34 | exception, please contact Red Hat. You must obey the GNU General Public |
| 35 | License in all respects for all of the Red Hat elfutils code and other |
| 36 | code used in conjunction with Red Hat elfutils except the Non-GPL Code |
| 37 | covered by this exception. If you modify this file, you may extend this |
| 38 | exception to your version of the file, but you are not obligated to do |
| 39 | so. If you do not wish to provide this exception without modification, |
| 40 | you must delete this exception statement from your version and license |
| 41 | this file solely under the GPL without exception. |
| 42 | |
| 43 | Red Hat elfutils is an included package of the Open Invention Network. |
| 44 | An included package of the Open Invention Network is a package for which |
| 45 | Open Invention Network licensees cross-license their patents. No patent |
| 46 | license is granted, either expressly or impliedly, by designation as an |
| 47 | included package. Should you wish to participate in the Open Invention |
| 48 | Network licensing program, please visit www.openinventionnetwork.com |
| 49 | <http://www.openinventionnetwork.com>. */ |
The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 50 | |
| 51 | #ifdef HAVE_CONFIG_H |
| 52 | # include <config.h> |
| 53 | #endif |
| 54 | |
| 55 | #include <libelf.h> |
| 56 | #include <stddef.h> |
| 57 | |
| 58 | #include "libelfP.h" |
| 59 | |
| 60 | |
| 61 | char * |
| 62 | elf_strptr (elf, idx, offset) |
| 63 | Elf *elf; |
| 64 | size_t idx; |
| 65 | size_t offset; |
| 66 | { |
| 67 | if (elf == NULL) |
| 68 | return NULL; |
| 69 | |
| 70 | if (elf->kind != ELF_K_ELF) |
| 71 | { |
| 72 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 73 | return NULL; |
| 74 | } |
| 75 | |
| 76 | rwlock_rdlock (elf->lock); |
| 77 | |
| 78 | char *result = NULL; |
| 79 | Elf_Scn *strscn; |
| 80 | |
| 81 | /* Find the section in the list. */ |
| 82 | Elf_ScnList *runp = (elf->class == ELFCLASS32 |
| 83 | || (offsetof (struct Elf, state.elf32.scns) |
| 84 | == offsetof (struct Elf, state.elf64.scns)) |
| 85 | ? &elf->state.elf32.scns : &elf->state.elf64.scns); |
| 86 | while (1) |
| 87 | { |
| 88 | if (idx < runp->max) |
| 89 | { |
| 90 | if (idx < runp->cnt) |
| 91 | strscn = &runp->data[idx]; |
| 92 | else |
| 93 | { |
| 94 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 95 | goto out; |
| 96 | } |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | idx -= runp->max; |
| 101 | |
| 102 | runp = runp->next; |
| 103 | if (runp == NULL) |
| 104 | { |
| 105 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 106 | goto out; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | if (elf->class == ELFCLASS32) |
| 111 | { |
| 112 | if (unlikely (strscn->shdr.e32->sh_type != SHT_STRTAB)) |
| 113 | { |
| 114 | /* This is no string section. */ |
| 115 | __libelf_seterrno (ELF_E_INVALID_SECTION); |
| 116 | goto out; |
| 117 | } |
| 118 | |
| 119 | if (unlikely (offset >= strscn->shdr.e32->sh_size)) |
| 120 | { |
| 121 | /* The given offset is too big, it is beyond this section. */ |
| 122 | __libelf_seterrno (ELF_E_OFFSET_RANGE); |
| 123 | goto out; |
| 124 | } |
| 125 | } |
| 126 | else |
| 127 | { |
| 128 | if (unlikely (strscn->shdr.e64->sh_type != SHT_STRTAB)) |
| 129 | { |
| 130 | /* This is no string section. */ |
| 131 | __libelf_seterrno (ELF_E_INVALID_SECTION); |
| 132 | goto out; |
| 133 | } |
| 134 | |
| 135 | if (unlikely (offset >= strscn->shdr.e64->sh_size)) |
| 136 | { |
| 137 | /* The given offset is too big, it is beyond this section. */ |
| 138 | __libelf_seterrno (ELF_E_OFFSET_RANGE); |
| 139 | goto out; |
| 140 | } |
| 141 | } |
| 142 | |
Ben Cheng | cc6695e | 2012-03-07 23:04:02 -0800 | [diff] [blame^] | 143 | if (strscn->rawdata_base == NULL && ! strscn->data_read) |
| 144 | { |
| 145 | rwlock_unlock (elf->lock); |
| 146 | rwlock_wrlock (elf->lock); |
| 147 | if (strscn->rawdata_base == NULL && ! strscn->data_read |
| 148 | /* Read the section data. */ |
| 149 | && __libelf_set_rawdata_wrlock (strscn) != 0) |
| 150 | goto out; |
| 151 | } |
The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 152 | |
Ben Cheng | cc6695e | 2012-03-07 23:04:02 -0800 | [diff] [blame^] | 153 | if (likely (strscn->rawdata_base != NULL)) |
| 154 | result = &strscn->rawdata_base[offset]; |
| 155 | else |
| 156 | { |
| 157 | /* This is a file which is currently created. Use the list of |
| 158 | data blocks. */ |
| 159 | struct Elf_Data_List *dl = &strscn->data_list; |
| 160 | while (dl != NULL) |
| 161 | { |
| 162 | if (offset >= (size_t) dl->data.d.d_off |
| 163 | && offset < dl->data.d.d_off + dl->data.d.d_size) |
| 164 | { |
| 165 | result = (char *) dl->data.d.d_buf + (offset - dl->data.d.d_off); |
| 166 | break; |
| 167 | } |
| 168 | |
| 169 | dl = dl->next; |
| 170 | } |
| 171 | } |
The Android Open Source Project | 441f72d | 2009-03-03 19:29:28 -0800 | [diff] [blame] | 172 | |
| 173 | out: |
| 174 | rwlock_unlock (elf->lock); |
| 175 | |
| 176 | return result; |
| 177 | } |
| 178 | INTDEF(elf_strptr) |