115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/* dl-x86_64.c - arch-dependent part of loadable module support */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2005,2007,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/elf.h>
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#include <grub/misc.h>
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#include <grub/err.h>
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#include <grub/i18n.h>
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/* Check if EHDR is a valid ELF header. */
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grub_err_t
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grub_arch_dl_check_header (void *ehdr)
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{
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Elf64_Ehdr *e = ehdr;
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/* Check the magic numbers. */
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if (e->e_ident[EI_CLASS] != ELFCLASS64
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|| e->e_ident[EI_DATA] != ELFDATA2LSB
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|| e->e_machine != EM_X86_64)
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return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
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return GRUB_ERR_NONE;
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}
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/* Relocate symbols. */
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grub_err_t
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grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
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Elf_Shdr *s, grub_dl_segment_t seg)
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{
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Elf64_Rela *rel, *max;
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for (rel = (Elf64_Rela *) ((char *) ehdr + s->sh_offset),
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max = (Elf64_Rela *) ((char *) rel + s->sh_size);
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rel < max;
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rel = (Elf64_Rela *) ((char *) rel + s->sh_entsize))
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{
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Elf64_Word *addr32;
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Elf64_Xword *addr64;
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Elf64_Sym *sym;
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if (seg->size < rel->r_offset)
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return grub_error (GRUB_ERR_BAD_MODULE,
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"reloc offset is out of the segment");
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addr32 = (Elf64_Word *) ((char *) seg->addr + rel->r_offset);
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addr64 = (Elf64_Xword *) addr32;
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sym = (Elf64_Sym *) ((char *) mod->symtab
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+ mod->symsize * ELF_R_SYM (rel->r_info));
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switch (ELF_R_TYPE (rel->r_info))
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{
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case R_X86_64_64:
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*addr64 += rel->r_addend + sym->st_value;
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break;
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case R_X86_64_PC32:
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{
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grub_int64_t value;
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value = ((grub_int32_t) *addr32) + rel->r_addend + sym->st_value -
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(Elf64_Xword) seg->addr - rel->r_offset;
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if (value != (grub_int32_t) value)
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return grub_error (GRUB_ERR_BAD_MODULE, "relocation out of range");
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*addr32 = value;
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}
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break;
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case R_X86_64_PC64:
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{
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*addr64 += rel->r_addend + sym->st_value -
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(Elf64_Xword) seg->addr - rel->r_offset;
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}
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break;
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case R_X86_64_32:
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{
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grub_uint64_t value = *addr32 + rel->r_addend + sym->st_value;
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if (value != (grub_uint32_t) value)
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return grub_error (GRUB_ERR_BAD_MODULE, "relocation out of range");
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*addr32 = value;
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}
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break;
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case R_X86_64_32S:
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{
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grub_int64_t value = ((grub_int32_t) *addr32) + rel->r_addend + sym->st_value;
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if (value != (grub_int32_t) value)
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return grub_error (GRUB_ERR_BAD_MODULE, "relocation out of range");
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*addr32 = value;
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}
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break;
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default:
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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N_("relocation 0x%x is not implemented yet"),
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ELF_R_TYPE (rel->r_info));
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}
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}
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return GRUB_ERR_NONE;
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}
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