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. |
| 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation, version 2. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software Foundation, |
| 17 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 18 | |
| 19 | #ifdef HAVE_CONFIG_H |
| 20 | # include <config.h> |
| 21 | #endif |
| 22 | |
| 23 | #include <gelf.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | |
| 27 | #include "libelfP.h" |
| 28 | |
| 29 | |
| 30 | int |
| 31 | gelf_update_symshndx (symdata, shndxdata, ndx, src, srcshndx) |
| 32 | Elf_Data *symdata; |
| 33 | Elf_Data *shndxdata; |
| 34 | int ndx; |
| 35 | GElf_Sym *src; |
| 36 | Elf32_Word srcshndx; |
| 37 | { |
| 38 | Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata; |
| 39 | Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata; |
| 40 | Elf_Scn *scn; |
| 41 | Elf32_Word *shndx = NULL; |
| 42 | int result = 0; |
| 43 | |
| 44 | if (symdata == NULL) |
| 45 | return 0; |
| 46 | |
| 47 | if (unlikely (ndx < 0)) |
| 48 | { |
| 49 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | if (unlikely (symdata_scn->d.d_type != ELF_T_SYM)) |
| 54 | { |
| 55 | /* The type of the data better should match. */ |
| 56 | __libelf_seterrno (ELF_E_DATA_MISMATCH); |
| 57 | return 0; |
| 58 | } |
| 59 | |
| 60 | scn = symdata_scn->s; |
| 61 | /* We simply have to believe the user that the two sections belong to |
| 62 | the same ELF file. */ |
| 63 | rwlock_wrlock (scn->elf->lock); |
| 64 | |
| 65 | /* The user is not required to pass a data descriptor for an extended |
| 66 | section index table. */ |
| 67 | if (shndxdata_scn != NULL) |
| 68 | { |
| 69 | if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size)) |
| 70 | { |
| 71 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 72 | goto out; |
| 73 | } |
| 74 | |
| 75 | shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx]; |
| 76 | } |
| 77 | /* But if s/he does not the extended sectio index must be zero. */ |
| 78 | else if (unlikely (srcshndx != 0)) |
| 79 | { |
| 80 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 81 | goto out; |
| 82 | } |
| 83 | |
| 84 | if (scn->elf->class == ELFCLASS32) |
| 85 | { |
| 86 | Elf32_Sym *sym; |
| 87 | |
| 88 | /* There is the possibility that the values in the input are |
| 89 | too large. */ |
| 90 | if (unlikely (src->st_value > 0xffffffffull) |
| 91 | || unlikely (src->st_size > 0xffffffffull)) |
| 92 | { |
| 93 | __libelf_seterrno (ELF_E_INVALID_DATA); |
| 94 | goto out; |
| 95 | } |
| 96 | |
| 97 | /* Check whether we have to resize the data buffer. */ |
| 98 | if (unlikely ((ndx + 1) * sizeof (Elf32_Sym) > symdata_scn->d.d_size)) |
| 99 | { |
| 100 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 101 | goto out; |
| 102 | } |
| 103 | |
| 104 | sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx]; |
| 105 | |
| 106 | #define COPY(name) \ |
| 107 | sym->name = src->name |
| 108 | COPY (st_name); |
| 109 | COPY (st_value); |
| 110 | COPY (st_size); |
| 111 | /* Please note that we can simply copy the `st_info' element since |
| 112 | the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same |
| 113 | for the 64 bit variant. */ |
| 114 | COPY (st_info); |
| 115 | COPY (st_other); |
| 116 | COPY (st_shndx); |
| 117 | } |
| 118 | else |
| 119 | { |
| 120 | /* Check whether we have to resize the data buffer. */ |
| 121 | if (unlikely ((ndx + 1) * sizeof (Elf64_Sym) > symdata_scn->d.d_size)) |
| 122 | { |
| 123 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 124 | goto out; |
| 125 | } |
| 126 | |
| 127 | ((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src; |
| 128 | } |
| 129 | |
| 130 | /* Now we can store the section index. */ |
| 131 | if (shndx != NULL) |
| 132 | *shndx = srcshndx; |
| 133 | |
| 134 | result = 1; |
| 135 | |
| 136 | /* Mark the section as modified. */ |
| 137 | scn->flags |= ELF_F_DIRTY; |
| 138 | |
| 139 | out: |
| 140 | rwlock_unlock (scn->elf->lock); |
| 141 | |
| 142 | return result; |
| 143 | } |