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64 lines
2.1 KiB
64 lines
2.1 KiB
4 months ago
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/* Resolve symbol values through .opd function descriptors.
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Copyright (C) 2013 Red Hat, Inc.
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This file is part of elfutils.
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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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#define BACKEND ppc64_
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#include "libebl_CPU.h"
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/* Resolve a function descriptor if addr points into the .opd section.
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The .opd section contains function descriptors consisting of 3 addresses.
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function, toc and chain. We are just interested in the first.
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http://refspecs.linuxfoundation.org/ELF/ppc64/PPC-elf64abi-1.9.html#FUNC-DES
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Returns true if the given address could be resolved, false otherwise.
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*/
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bool
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ppc64_resolve_sym_value (Ebl *ebl, GElf_Addr *addr)
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{
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if (ebl->fd_data != NULL && *addr >= ebl->fd_addr
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&& *addr + sizeof (Elf64_Addr) <= ebl->fd_addr + ebl->fd_data->d_size)
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{
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GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (ebl->elf, &ehdr_mem);
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if (ehdr != NULL)
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{
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Elf_Data opd_in, opd_out;
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opd_in.d_buf = ebl->fd_data->d_buf + (*addr - ebl->fd_addr);
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opd_out.d_buf = addr;
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opd_out.d_size = opd_in.d_size = sizeof (Elf64_Addr);
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opd_out.d_type = opd_in.d_type = ELF_T_ADDR;
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if (elf64_xlatetom (&opd_out, &opd_in,
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ehdr->e_ident[EI_DATA]) != NULL)
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return true;
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}
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}
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return false;
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}
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