Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame^] | 1 | /* Get symbol version information at the given index. |
| 2 | Copyright (C) 1999, 2000, 2001, 2002 Red Hat, Inc. |
| 3 | Written by Ulrich Drepper <drepper@redhat.com>, 1999. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation, version 2. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program; if not, write to the Free Software Foundation, |
| 16 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 17 | |
| 18 | #ifdef HAVE_CONFIG_H |
| 19 | # include <config.h> |
| 20 | #endif |
| 21 | |
| 22 | #include <assert.h> |
| 23 | #include <gelf.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | #include "libelfP.h" |
| 27 | |
| 28 | |
| 29 | GElf_Versym * |
| 30 | gelf_getversym (data, ndx, dst) |
| 31 | Elf_Data *data; |
| 32 | int ndx; |
| 33 | GElf_Versym *dst; |
| 34 | { |
| 35 | Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; |
| 36 | Elf_Scn *scn; |
| 37 | GElf_Versym *result; |
| 38 | |
| 39 | if (data == NULL) |
| 40 | return NULL; |
| 41 | |
| 42 | if (unlikely (data->d_type != ELF_T_HALF)) |
| 43 | { |
| 44 | __libelf_seterrno (ELF_E_INVALID_HANDLE); |
| 45 | return NULL; |
| 46 | } |
| 47 | |
| 48 | /* This is the one place where we have to take advantage of the fact |
| 49 | that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'. |
| 50 | The interface is broken so that it requires this hack. */ |
| 51 | scn = data_scn->s; |
| 52 | |
| 53 | /* It's easy to handle this type. It has the same size for 32 and |
| 54 | 64 bit objects. */ |
| 55 | assert (sizeof (GElf_Versym) == sizeof (Elf32_Versym)); |
| 56 | assert (sizeof (GElf_Versym) == sizeof (Elf64_Versym)); |
| 57 | |
| 58 | rwlock_rdlock (scn->elf->lock); |
| 59 | |
| 60 | /* The data is already in the correct form. Just make sure the |
| 61 | index is OK. */ |
| 62 | if (unlikely ((ndx + 1) * sizeof (GElf_Versym) > data->d_size)) |
| 63 | { |
| 64 | __libelf_seterrno (ELF_E_INVALID_INDEX); |
| 65 | result = NULL; |
| 66 | } |
| 67 | else |
| 68 | { |
| 69 | *dst = ((GElf_Versym *) data->d_buf)[ndx]; |
| 70 | |
| 71 | result = dst; |
| 72 | } |
| 73 | |
| 74 | rwlock_unlock (scn->elf->lock); |
| 75 | |
| 76 | return result; |
| 77 | } |