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137 lines
3.9 KiB
137 lines
3.9 KiB
/* Get symbol information and separate section index from symbol table
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at the 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 <assert.h>
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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_Sym *
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gelf_getsymshndx (Elf_Data *symdata, Elf_Data *shndxdata, int ndx,
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GElf_Sym *dst, Elf32_Word *dstshndx)
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{
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Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata;
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Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata;
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GElf_Sym *result = NULL;
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Elf32_Word shndx = 0;
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if (symdata == NULL)
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return NULL;
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if (unlikely (symdata->d_type != ELF_T_SYM)
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|| (likely (shndxdata_scn != NULL)
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&& unlikely (shndxdata->d_type != ELF_T_WORD)))
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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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rwlock_rdlock (symdata_scn->s->elf->lock);
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/* The user is not required to pass a data descriptor for an extended
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section index table. */
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if (likely (shndxdata_scn != NULL))
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{
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if (INVALID_NDX (ndx, Elf32_Word, &shndxdata_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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shndx = ((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx];
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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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if (symdata_scn->s->elf->class == ELFCLASS32)
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{
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Elf32_Sym *src;
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/* Here it gets a bit more complicated. The format of the symbol
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table entries has to be adopted. The user better has provided
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a buffer where we can store the information. While copying the
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data we are converting the format. */
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if (INVALID_NDX (ndx, Elf32_Sym, symdata))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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src = &((Elf32_Sym *) symdata->d_buf)[ndx];
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/* This might look like a simple copy operation but it's
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not. There are zero- and sign-extensions going on. */
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#define COPY(name) \
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dst->name = src->name
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COPY (st_name);
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/* Please note that we can simply copy the `st_info' element since
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the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
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for the 64 bit variant. */
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COPY (st_info);
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COPY (st_other);
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COPY (st_shndx);
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COPY (st_value);
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COPY (st_size);
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}
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else
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{
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/* If this is a 64 bit object it's easy. */
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assert (sizeof (GElf_Sym) == sizeof (Elf64_Sym));
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/* The data is already in the correct form. Just make sure the
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index is OK. */
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if (INVALID_NDX (ndx, GElf_Sym, symdata))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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*dst = ((GElf_Sym *) symdata->d_buf)[ndx];
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}
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/* Now we can store the section index. */
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if (dstshndx != NULL)
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*dstshndx = shndx;
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result = dst;
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out:
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rwlock_unlock (symdata_scn->s->elf->lock);
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return result;
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}
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