135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
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/* AArch64 specific symbolic name handling.
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Copyright (C) 2013, 2015, 2017 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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#include <elf.h>
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#include <stddef.h>
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#include <string.h>
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#define BACKEND aarch64_
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#include "libebl_CPU.h"
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/* Check for the simple reloc types. */
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Elf_Type
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aarch64_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_AARCH64_ABS64:
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return ELF_T_XWORD;
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case R_AARCH64_ABS32:
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return ELF_T_WORD;
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case R_AARCH64_ABS16:
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return ELF_T_HALF;
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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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/* If this is the _GLOBAL_OFFSET_TABLE_ symbol, then it should point in
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the .got even if there is a .got.plt section.
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https://sourceware.org/ml/libc-ports/2013-06/msg00057.html
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https://bugzilla.redhat.com/show_bug.cgi?id=1201778
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*/
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bool
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aarch64_check_special_symbol (Elf *elf, const GElf_Sym *sym,
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const char *name, const GElf_Shdr *destshdr)
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{
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if (name != NULL
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&& strcmp (name, "_GLOBAL_OFFSET_TABLE_") == 0)
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{
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size_t shstrndx;
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if (elf_getshdrstrndx (elf, &shstrndx) != 0)
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return false;
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const char *sname = elf_strptr (elf, shstrndx, destshdr->sh_name);
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if (sname != NULL
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&& (strcmp (sname, ".got") == 0 || strcmp (sname, ".got.plt") == 0))
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{
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Elf_Scn *scn = NULL;
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while ((scn = elf_nextscn (elf, scn)) != NULL)
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{
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GElf_Shdr shdr_mem;
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GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
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if (shdr != NULL)
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{
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sname = elf_strptr (elf, shstrndx, shdr->sh_name);
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if (sname != NULL && strcmp (sname, ".got") == 0)
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return (sym->st_value >= shdr->sh_addr
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&& sym->st_value < shdr->sh_addr + shdr->sh_size);
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}
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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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/* A data mapping symbol is a symbol with "$d" name or "$d.<any...>" name,
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STT_NOTYPE, STB_LOCAL and st_size of zero. The indicate the stat of a
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sequence of data items. */
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bool
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aarch64_data_marker_symbol (const GElf_Sym *sym, const char *sname)
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{
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return (sym != NULL && sname != NULL
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&& sym->st_size == 0 && GELF_ST_BIND (sym->st_info) == STB_LOCAL
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&& GELF_ST_TYPE (sym->st_info) == STT_NOTYPE
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&& (strcmp (sname, "$d") == 0 || strncmp (sname, "$d.", 3) == 0));
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}
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const char *
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aarch64_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_AARCH64_BTI_PLT:
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return "AARCH64_BTI_PLT";
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case DT_AARCH64_PAC_PLT:
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return "AARCH64_PAC_PLT";
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case DT_AARCH64_VARIANT_PCS:
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return "AARCH64_VARIANT_PCS";
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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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aarch64_dynamic_tag_check (int64_t tag)
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{
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return (tag == DT_AARCH64_BTI_PLT
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|| tag == DT_AARCH64_PAC_PLT
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|| tag == DT_AARCH64_VARIANT_PCS);
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}
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