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- /* dl-x86_64.c - arch-dependent part of loadable module support */
- /*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2002,2005,2007,2009 Free Software Foundation, Inc.
- *
- * GRUB is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * GRUB is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
- */
- #include <grub/dl.h>
- #include <grub/elf.h>
- #include <grub/misc.h>
- #include <grub/err.h>
- #include <grub/i18n.h>
- /* Check if EHDR is a valid ELF header. */
- grub_err_t
- grub_arch_dl_check_header (void *ehdr)
- {
- Elf64_Ehdr *e = ehdr;
- /* Check the magic numbers. */
- if (e->e_ident[EI_CLASS] != ELFCLASS64
- || e->e_ident[EI_DATA] != ELFDATA2LSB
- || e->e_machine != EM_X86_64)
- return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
- return GRUB_ERR_NONE;
- }
- /* Relocate symbols. */
- grub_err_t
- grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
- Elf_Shdr *s, grub_dl_segment_t seg)
- {
- Elf64_Rela *rel, *max;
- for (rel = (Elf64_Rela *) ((char *) ehdr + s->sh_offset),
- max = (Elf64_Rela *) ((char *) rel + s->sh_size);
- rel < max;
- rel = (Elf64_Rela *) ((char *) rel + s->sh_entsize))
- {
- Elf64_Word *addr32;
- Elf64_Xword *addr64;
- Elf64_Sym *sym;
- if (seg->size < rel->r_offset)
- return grub_error (GRUB_ERR_BAD_MODULE,
- "reloc offset is out of the segment");
- addr32 = (Elf64_Word *) ((char *) seg->addr + rel->r_offset);
- addr64 = (Elf64_Xword *) addr32;
- sym = (Elf64_Sym *) ((char *) mod->symtab
- + mod->symsize * ELF_R_SYM (rel->r_info));
- switch (ELF_R_TYPE (rel->r_info))
- {
- case R_X86_64_64:
- *addr64 += rel->r_addend + sym->st_value;
- break;
- case R_X86_64_PC32:
- case R_X86_64_PLT32:
- {
- grub_int64_t value;
- value = ((grub_int32_t) *addr32) + rel->r_addend + sym->st_value -
- (Elf64_Xword) (grub_addr_t) seg->addr - rel->r_offset;
- if (value != (grub_int32_t) value)
- return grub_error (GRUB_ERR_BAD_MODULE, "relocation out of range");
- *addr32 = value;
- }
- break;
- case R_X86_64_PC64:
- {
- *addr64 += rel->r_addend + sym->st_value -
- (Elf64_Xword) (grub_addr_t) seg->addr - rel->r_offset;
- }
- break;
- case R_X86_64_32:
- {
- grub_uint64_t value = *addr32 + rel->r_addend + sym->st_value;
- if (value != (grub_uint32_t) value)
- return grub_error (GRUB_ERR_BAD_MODULE, "relocation out of range");
- *addr32 = value;
- }
- break;
- case R_X86_64_32S:
- {
- grub_int64_t value = ((grub_int32_t) *addr32) + rel->r_addend + sym->st_value;
- if (value != (grub_int32_t) value)
- return grub_error (GRUB_ERR_BAD_MODULE, "relocation out of range");
- *addr32 = value;
- }
- break;
- default:
- {
- char rel_info[17]; /* log16(2^64) = 16, plus NUL. */
- grub_snprintf (rel_info, sizeof (rel_info) - 1, "%" PRIxGRUB_UINT64_T,
- ELF_R_TYPE (rel->r_info));
- return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
- N_("relocation 0x%s is not implemented yet"), rel_info);
- }
- }
- }
- return GRUB_ERR_NONE;
- }
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