157 lines
4.1 KiB
C
157 lines
4.1 KiB
C
/* Alpha specific symbolic name handling.
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Copyright (C) 2002-2011 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 <elf.h>
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#include <stddef.h>
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#include <string.h>
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#define BACKEND alpha_
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#include "libebl_CPU.h"
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const char *
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alpha_dynamic_tag_name (int64_t tag, char *buf __attribute__ ((unused)),
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size_t len __attribute__ ((unused)))
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{
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switch (tag)
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{
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case DT_ALPHA_PLTRO:
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return "ALPHA_PLTRO";
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default:
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break;
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}
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return NULL;
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}
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bool
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alpha_dynamic_tag_check (int64_t tag)
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{
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return tag == DT_ALPHA_PLTRO;
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}
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/* Check for the simple reloc types. */
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Elf_Type
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alpha_reloc_simple_type (Ebl *ebl __attribute__ ((unused)), int type,
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int *addsub __attribute__ ((unused)))
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{
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switch (type)
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{
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case R_ALPHA_REFLONG:
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return ELF_T_WORD;
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case R_ALPHA_REFQUAD:
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return ELF_T_XWORD;
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default:
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return ELF_T_NUM;
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}
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}
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/* Check whether SHF_MASKPROC flags are valid. */
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bool
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alpha_machine_section_flag_check (GElf_Xword sh_flags)
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{
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return (sh_flags &~ (SHF_ALPHA_GPREL)) == 0;
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}
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bool
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alpha_check_special_section (Ebl *ebl,
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int ndx __attribute__ ((unused)),
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const GElf_Shdr *shdr,
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const char *sname __attribute__ ((unused)))
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{
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if ((shdr->sh_flags
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& (SHF_WRITE | SHF_EXECINSTR)) == (SHF_WRITE | SHF_EXECINSTR)
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&& shdr->sh_addr != 0)
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{
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/* This is ordinarily flagged, but is valid for an old-style PLT.
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Look for the SHT_DYNAMIC section and the DT_PLTGOT tag in it.
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Its d_ptr should match the .plt section's sh_addr. */
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Elf_Scn *scn = NULL;
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while ((scn = elf_nextscn (ebl->elf, scn)) != NULL)
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{
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GElf_Shdr scn_shdr;
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if (likely (gelf_getshdr (scn, &scn_shdr) != NULL)
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&& scn_shdr.sh_type == SHT_DYNAMIC
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&& scn_shdr.sh_entsize != 0)
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{
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GElf_Addr pltgot = 0;
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Elf_Data *data = elf_getdata (scn, NULL);
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if (data != NULL)
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for (size_t i = 0; i < data->d_size / scn_shdr.sh_entsize; ++i)
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{
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GElf_Dyn dyn;
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if (unlikely (gelf_getdyn (data, i, &dyn) == NULL))
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break;
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if (dyn.d_tag == DT_PLTGOT)
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pltgot = dyn.d_un.d_ptr;
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else if (dyn.d_tag == DT_ALPHA_PLTRO && dyn.d_un.d_val != 0)
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return false; /* This PLT should not be writable. */
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}
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return pltgot == shdr->sh_addr;
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}
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}
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}
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return false;
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}
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/* Check whether given symbol's st_value and st_size are OK despite failing
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normal checks. */
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bool
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alpha_check_special_symbol (Elf *elf __attribute__ ((unused)),
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const GElf_Sym *sym __attribute__ ((unused)),
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const char *name,
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const GElf_Shdr *destshdr __attribute__ ((unused)))
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{
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if (name == NULL)
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return false;
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if (strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
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/* On Alpha any place in the section is valid. */
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return true;
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return false;
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}
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/* Check whether only valid bits are set on the st_other symbol flag.
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Standard ST_VISIBILITY have already been masked off. */
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bool
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alpha_check_st_other_bits (unsigned char st_other)
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{
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return ((((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_NOPV)
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|| ((st_other & STO_ALPHA_STD_GPLOAD) == STO_ALPHA_STD_GPLOAD))
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&& (st_other &~ STO_ALPHA_STD_GPLOAD) == 0);
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}
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