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99 lines
2.6 KiB
99 lines
2.6 KiB
/* Get REL relocation information at given index. |
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Copyright (C) 2000, 2001, 2002, 2005, 2009, 2014, 2015 Red Hat, Inc. |
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This file is part of elfutils. |
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Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
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This file is free software; you can redistribute it and/or modify |
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it under the terms of either |
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* the GNU Lesser General Public License as published by the Free |
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Software Foundation; either version 3 of the License, or (at |
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your option) any later version |
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or |
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* the GNU General Public License as published by the Free |
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Software Foundation; either version 2 of the License, or (at |
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your option) any later version |
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or both in parallel, as here. |
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elfutils is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received copies of the GNU General Public License and |
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the GNU Lesser General Public License along with this program. If |
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not, see <http://www.gnu.org/licenses/>. */ |
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
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#endif |
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#include <gelf.h> |
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#include <string.h> |
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#include "libelfP.h" |
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GElf_Rel * |
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gelf_getrel (Elf_Data *data, int ndx, GElf_Rel *dst) |
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{ |
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Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; |
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Elf_Scn *scn; |
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GElf_Rel *result; |
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if (data_scn == NULL) |
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return NULL; |
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if (unlikely (data_scn->d.d_type != ELF_T_REL)) |
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{ |
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__libelf_seterrno (ELF_E_INVALID_HANDLE); |
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return NULL; |
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} |
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/* This is the one place where we have to take advantage of the fact |
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that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'. |
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The interface is broken so that it requires this hack. */ |
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scn = data_scn->s; |
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rwlock_rdlock (scn->elf->lock); |
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if (scn->elf->class == ELFCLASS32) |
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{ |
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/* We have to convert the data. */ |
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if (INVALID_NDX (ndx, Elf32_Rel, &data_scn->d)) |
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{ |
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__libelf_seterrno (ELF_E_INVALID_INDEX); |
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result = NULL; |
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} |
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else |
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{ |
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Elf32_Rel *src = &((Elf32_Rel *) data_scn->d.d_buf)[ndx]; |
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dst->r_offset = src->r_offset; |
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dst->r_info = GELF_R_INFO (ELF32_R_SYM (src->r_info), |
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ELF32_R_TYPE (src->r_info)); |
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result = dst; |
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} |
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} |
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else |
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{ |
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/* Simply copy the data after we made sure we are actually getting |
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correct data. */ |
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if (INVALID_NDX (ndx, Elf64_Rel, &data_scn->d)) |
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{ |
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__libelf_seterrno (ELF_E_INVALID_INDEX); |
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result = NULL; |
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} |
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else |
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result = memcpy (dst, &((Elf64_Rel *) data_scn->d.d_buf)[ndx], |
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sizeof (Elf64_Rel)); |
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} |
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rwlock_unlock (scn->elf->lock); |
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return result; |
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}
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