1324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver/* Return string pointer from string section. 2324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2008, 2009 Red Hat, Inc. 3324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver This file is part of Red Hat elfutils. 4324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Contributed by Ulrich Drepper <drepper@redhat.com>, 1998. 5324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 6324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Red Hat elfutils is free software; you can redistribute it and/or modify 7324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver it under the terms of the GNU General Public License as published by the 8324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Free Software Foundation; version 2 of the License. 9324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 10324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Red Hat elfutils is distributed in the hope that it will be useful, but 11324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver WITHOUT ANY WARRANTY; without even the implied warranty of 12324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver General Public License for more details. 14324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 15324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver You should have received a copy of the GNU General Public License along 16324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver with Red Hat elfutils; if not, write to the Free Software Foundation, 17324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 19324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver In addition, as a special exception, Red Hat, Inc. gives You the 20324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver additional right to link the code of Red Hat elfutils with code licensed 21324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver under any Open Source Initiative certified open source license 22324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver (http://www.opensource.org/licenses/index.php) which requires the 23324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver distribution of source code with any binary distribution and to 24324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver distribute linked combinations of the two. Non-GPL Code permitted under 25324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this exception must only link to the code of Red Hat elfutils through 26324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver those well defined interfaces identified in the file named EXCEPTION 27324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver found in the source code files (the "Approved Interfaces"). The files 28324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver of Non-GPL Code may instantiate templates or use macros or inline 29324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver functions from the Approved Interfaces without causing the resulting 30324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver work to be covered by the GNU General Public License. Only Red Hat, 31324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Inc. may make changes or additions to the list of Approved Interfaces. 32324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Red Hat's grant of this exception is conditioned upon your not adding 33324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver any new exceptions. If you wish to add a new Approved Interface or 34324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver exception, please contact Red Hat. You must obey the GNU General Public 35324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver License in all respects for all of the Red Hat elfutils code and other 36324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver code used in conjunction with Red Hat elfutils except the Non-GPL Code 37324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver covered by this exception. If you modify this file, you may extend this 38324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver exception to your version of the file, but you are not obligated to do 39324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver so. If you do not wish to provide this exception without modification, 40324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver you must delete this exception statement from your version and license 41324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver this file solely under the GPL without exception. 42324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 43324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Red Hat elfutils is an included package of the Open Invention Network. 44324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver An included package of the Open Invention Network is a package for which 45324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Open Invention Network licensees cross-license their patents. No patent 46324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver license is granted, either expressly or impliedly, by designation as an 47324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver included package. Should you wish to participate in the Open Invention 48324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Network licensing program, please visit www.openinventionnetwork.com 49324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver <http://www.openinventionnetwork.com>. */ 50324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 51324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#ifdef HAVE_CONFIG_H 52324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver# include <config.h> 53324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#endif 54324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 55324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include <libelf.h> 56324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include <stddef.h> 57324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 58324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver#include "libelfP.h" 59324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 60324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 61324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverchar * 62324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruverelf_strptr (elf, idx, offset) 63324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Elf *elf; 64324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver size_t idx; 65324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver size_t offset; 66324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver{ 67324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (elf == NULL) 68324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return NULL; 69324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 70324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (elf->kind != ELF_K_ELF) 71324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 72324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver __libelf_seterrno (ELF_E_INVALID_HANDLE); 73324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver return NULL; 74324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver } 75324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 76324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver rwlock_rdlock (elf->lock); 77324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 78324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver char *result = NULL; 79324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Elf_Scn *strscn; 80324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 81324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver /* Find the section in the list. */ 82324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver Elf_ScnList *runp = (elf->class == ELFCLASS32 83324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver || (offsetof (struct Elf, state.elf32.scns) 84324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver == offsetof (struct Elf, state.elf64.scns)) 85324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver ? &elf->state.elf32.scns : &elf->state.elf64.scns); 86324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver while (1) 87324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 88324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (idx < runp->max) 89324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver { 90324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver if (idx < runp->cnt) 91324c4644fee44b9898524c09511bd33c3f12e2dfBen Gruver 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 } 142 143 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 } 152 153 if (likely (strscn->rawdata_base != NULL)) 154 // XXX Is this correct if a file is read and then new data is added 155 // XXX to the string section? Likely needs to check offset against 156 // XXX size of rawdata_base buffer and then iterate over rest of the 157 // XXX list. 158 result = &strscn->rawdata_base[offset]; 159 else 160 { 161 /* This is a file which is currently created. Use the list of 162 data blocks. */ 163 struct Elf_Data_List *dl = &strscn->data_list; 164 while (dl != NULL) 165 { 166 if (offset >= (size_t) dl->data.d.d_off 167 && offset < dl->data.d.d_off + dl->data.d.d_size) 168 { 169 result = (char *) dl->data.d.d_buf + (offset - dl->data.d.d_off); 170 break; 171 } 172 173 dl = dl->next; 174 } 175 } 176 177 out: 178 rwlock_unlock (elf->lock); 179 180 return result; 181} 182INTDEF(elf_strptr) 183