Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Update symbol information and section index in symbol table at the |
| 2 | given index. |
| 3 | Copyright (C) 2000, 2001, 2002 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 4 | This file is part of elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 5 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| 6 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 7 | This file is free software; you can redistribute it and/or modify |
| 8 | it under the terms of either |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 9 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 10 | * the GNU Lesser General Public License as published by the Free |
| 11 | Software Foundation; either version 3 of the License, or (at |
| 12 | your option) any later version |
| 13 | |
| 14 | or |
| 15 | |
| 16 | * the GNU General Public License as published by the Free |
| 17 | Software Foundation; either version 2 of the License, or (at |
| 18 | your option) any later version |
| 19 | |
| 20 | or both in parallel, as here. |
| 21 | |
| 22 | elfutils is distributed in the hope that it will be useful, but |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 23 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 25 | General Public License for more details. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 26 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 27 | You should have received copies of the GNU General Public License and |
| 28 | the GNU Lesser General Public License along with this program. If |
| 29 | not, see <http://www.gnu.org/licenses/>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 30 | |
| 31 | #ifdef HAVE_CONFIG_H |
| 32 | # include <config.h> |
| 33 | #endif |
| 34 | |
| 35 | #include <gelf.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | |
| 39 | #include "libelfP.h" |
| 40 | |
| 41 | |
| 42 | int |
| 43 | gelf_update_symshndx (symdata, shndxdata, ndx, src, srcshndx) |
| 44 | Elf_Data *symdata; |
| 45 | Elf_Data *shndxdata; |
| 46 | int ndx; |
| 47 | GElf_Sym *src; |
| 48 | Elf32_Word srcshndx; |
| 49 | { |
| 50 | Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata; |
| 51 | Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata; |
| 52 | Elf_Scn *scn; |
| 53 | Elf32_Word *shndx = NULL; |
| 54 | int result = 0; |
| 55 | |
| 56 | if (symdata == NULL) |
| 57 | return 0; |
| 58 | |
| 59 | if (unlikely (ndx < 0)) |
| 60 | { |
| 61 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | if (unlikely (symdata_scn->d.d_type != ELF_T_SYM)) |
| 66 | { |
| 67 | /* The type of the data better should match. */ |
| 68 | __libelf_seterrno (ELF_E_DATA_MISMATCH); |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | scn = symdata_scn->s; |
| 73 | /* We simply have to believe the user that the two sections belong to |
| 74 | the same ELF file. */ |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 75 | rwlock_wrlock (scn->elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 76 | |
| 77 | /* The user is not required to pass a data descriptor for an extended |
| 78 | section index table. */ |
| 79 | if (shndxdata_scn != NULL) |
| 80 | { |
| 81 | if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size)) |
| 82 | { |
| 83 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 84 | goto out; |
| 85 | } |
| 86 | |
| 87 | shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx]; |
| 88 | } |
| 89 | /* But if s/he does not the extended sectio index must be zero. */ |
| 90 | else if (unlikely (srcshndx != 0)) |
| 91 | { |
| 92 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 93 | goto out; |
| 94 | } |
| 95 | |
| 96 | if (scn->elf->class == ELFCLASS32) |
| 97 | { |
| 98 | Elf32_Sym *sym; |
| 99 | |
| 100 | /* There is the possibility that the values in the input are |
| 101 | too large. */ |
| 102 | if (unlikely (src->st_value > 0xffffffffull) |
| 103 | || unlikely (src->st_size > 0xffffffffull)) |
| 104 | { |
| 105 | __libelf_seterrno (ELF_E_INVALID_DATA); |
| 106 | goto out; |
| 107 | } |
| 108 | |
| 109 | /* Check whether we have to resize the data buffer. */ |
| 110 | if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata_scn->d.d_size)) |
| 111 | { |
| 112 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 113 | goto out; |
| 114 | } |
| 115 | |
| 116 | sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx]; |
| 117 | |
| 118 | #define COPY(name) \ |
| 119 | sym->name = src->name |
| 120 | COPY (st_name); |
| 121 | COPY (st_value); |
| 122 | COPY (st_size); |
| 123 | /* Please note that we can simply copy the `st_info' element since |
| 124 | the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same |
| 125 | for the 64 bit variant. */ |
| 126 | COPY (st_info); |
| 127 | COPY (st_other); |
| 128 | COPY (st_shndx); |
| 129 | } |
| 130 | else |
| 131 | { |
| 132 | /* Check whether we have to resize the data buffer. */ |
| 133 | if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > symdata_scn->d.d_size)) |
| 134 | { |
| 135 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 136 | goto out; |
| 137 | } |
| 138 | |
| 139 | ((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src; |
| 140 | } |
| 141 | |
| 142 | /* Now we can store the section index. */ |
| 143 | if (shndx != NULL) |
| 144 | *shndx = srcshndx; |
| 145 | |
| 146 | result = 1; |
| 147 | |
| 148 | /* Mark the section as modified. */ |
| 149 | scn->flags |= ELF_F_DIRTY; |
| 150 | |
| 151 | out: |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 152 | rwlock_unlock (scn->elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 153 | |
| 154 | return result; |
| 155 | } |