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163 lines
4.1 KiB
163 lines
4.1 KiB
/* Common code for ebl reloc functions.
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Copyright (C) 2005, 2006 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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#include "libebl_CPU.h"
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#include <assert.h>
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#define R_TYPE(name) PASTE (RELOC_PREFIX, name)
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#define PASTE(a, b) PASTE_1 (a, b)
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#define PASTE_1(a, b) a##b
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#define R_NAME(name) R_NAME_1 (RELOC_PREFIX, name)
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#define R_NAME_1(prefix, type) R_NAME_2 (prefix, type)
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#define R_NAME_2(prefix, type) #prefix #type
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#define RELOC_TYPES STRINGIFIED_PASTE (BACKEND, reloc.def)
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#define STRINGIFIED_PASTE(a, b) STRINGIFY (PASTE (a, b))
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#define STRINGIFY(x) STRINGIFY_1 (x)
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#define STRINGIFY_1(x) #x
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/* Provide a table of reloc type names, in a PIC-friendly fashion. */
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static const struct EBLHOOK(reloc_nametable)
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{
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char zero[1];
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#define RELOC_TYPE(type, uses) \
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char name_##type[sizeof R_NAME (type)];
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#include RELOC_TYPES
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#undef RELOC_TYPE
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} EBLHOOK(reloc_nametable) =
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{
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{ '\0' },
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#define RELOC_TYPE(type, uses) R_NAME (type),
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#include RELOC_TYPES
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#undef RELOC_TYPE
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};
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#define reloc_namestr (&EBLHOOK(reloc_nametable).zero)
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static const uint_fast16_t EBLHOOK(reloc_nameidx)[] =
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{
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#define RELOC_TYPE(type, uses) \
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[R_TYPE (type)] = offsetof (struct EBLHOOK(reloc_nametable), name_##type),
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#include RELOC_TYPES
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#undef RELOC_TYPE
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};
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#define nreloc \
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((int) (sizeof EBLHOOK(reloc_nameidx) / sizeof EBLHOOK(reloc_nameidx)[0]))
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#define REL (1 << (ET_REL - 1))
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#define EXEC (1 << (ET_EXEC - 1))
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#define DYN (1 << (ET_DYN - 1))
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static const uint8_t EBLHOOK(reloc_valid)[] =
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{
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#define RELOC_TYPE(type, uses) [R_TYPE (type)] = uses,
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#include RELOC_TYPES
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#undef RELOC_TYPE
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};
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#undef REL
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#undef EXEC
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#undef DYN
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const char *
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EBLHOOK(reloc_type_name) (int reloc,
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char *buf __attribute__ ((unused)),
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size_t len __attribute__ ((unused)))
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{
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#ifdef RELOC_TYPE_ID
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reloc = RELOC_TYPE_ID (reloc);
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#endif
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if (reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0)
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return reloc_namestr[EBLHOOK(reloc_nameidx)[reloc]];
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return NULL;
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}
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bool
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EBLHOOK(reloc_type_check) (int reloc)
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{
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#ifdef RELOC_TYPE_ID
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reloc = RELOC_TYPE_ID (reloc);
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#endif
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return reloc >= 0 && reloc < nreloc && EBLHOOK(reloc_nameidx)[reloc] != 0;
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}
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bool
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EBLHOOK(reloc_valid_use) (Elf *elf, int reloc)
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{
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uint8_t uses;
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GElf_Ehdr ehdr_mem;
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GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
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assert (ehdr != NULL);
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uint8_t type = ehdr->e_type;
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#ifdef RELOC_TYPE_ID
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reloc = RELOC_TYPE_ID (reloc);
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#endif
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uses = EBLHOOK(reloc_valid)[reloc];
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return type > ET_NONE && type < ET_CORE && (uses & (1 << (type - 1)));
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}
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#ifndef NO_COPY_RELOC
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bool
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EBLHOOK(copy_reloc_p) (int reloc)
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{
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return reloc == R_TYPE (COPY);
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}
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#endif
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bool
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EBLHOOK(none_reloc_p) (int reloc)
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{
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return reloc == R_TYPE (NONE);
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}
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#ifndef NO_RELATIVE_RELOC
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bool
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EBLHOOK(relative_reloc_p) (int reloc)
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{
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return reloc == R_TYPE (RELATIVE);
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}
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#endif
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static void
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EBLHOOK(init_reloc) (Ebl *ebl)
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{
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ebl->reloc_type_name = EBLHOOK(reloc_type_name);
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ebl->reloc_type_check = EBLHOOK(reloc_type_check);
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ebl->reloc_valid_use = EBLHOOK(reloc_valid_use);
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ebl->none_reloc_p = EBLHOOK(none_reloc_p);
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#ifndef NO_COPY_RELOC
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ebl->copy_reloc_p = EBLHOOK(copy_reloc_p);
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#endif
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#ifndef NO_RELATIVE_RELOC
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ebl->relative_reloc_p = EBLHOOK(relative_reloc_p);
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#endif
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}
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