115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/* i386 CPU-specific part of loadcore.c for 32-bit mode */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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/err.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/efiemu/efiemu.h>
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#include <grub/cpu/efiemu.h>
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#include <grub/elf.h>
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/* Check if EHDR is a valid ELF header. */
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int
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grub_arch_efiemu_check_header32 (void *ehdr)
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{
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Elf32_Ehdr *e = ehdr;
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/* Check the magic numbers. */
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return (e->e_ident[EI_CLASS] == ELFCLASS32
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&& e->e_ident[EI_DATA] == ELFDATA2LSB
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&& e->e_machine == EM_386);
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}
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/* Relocate symbols. */
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grub_err_t
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grub_arch_efiemu_relocate_symbols32 (grub_efiemu_segment_t segs,
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struct grub_efiemu_elf_sym *elfsyms,
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void *ehdr)
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{
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unsigned i;
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Elf32_Ehdr *e = ehdr;
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Elf32_Shdr *s;
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grub_err_t err;
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grub_dprintf ("efiemu", "relocating symbols %d %d\n",
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e->e_shoff, e->e_shnum);
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for (i = 0, s = (Elf32_Shdr *) ((char *) e + e->e_shoff);
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i < e->e_shnum;
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i++, s = (Elf32_Shdr *) ((char *) s + e->e_shentsize))
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if (s->sh_type == SHT_REL)
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{
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grub_efiemu_segment_t seg;
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grub_dprintf ("efiemu", "shtrel\n");
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/* Find the target segment. */
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for (seg = segs; seg; seg = seg->next)
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if (seg->section == s->sh_info)
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break;
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if (seg)
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{
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Elf32_Rel *rel, *max;
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for (rel = (Elf32_Rel *) ((char *) e + s->sh_offset),
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max = rel + s->sh_size / s->sh_entsize;
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rel < max;
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rel++)
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{
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Elf32_Word *addr;
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struct grub_efiemu_elf_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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addr = (Elf32_Word *)
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((char *) grub_efiemu_mm_obtain_request (seg->handle)
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+ seg->off + rel->r_offset);
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sym = elfsyms[ELF32_R_SYM (rel->r_info)];
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switch (ELF32_R_TYPE (rel->r_info))
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{
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case R_386_32:
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if ((err = grub_efiemu_write_value
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(addr, sym.off + *addr, sym.handle, 0,
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seg->ptv_rel_needed, sizeof (grub_uint32_t))))
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return err;
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break;
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case R_386_PC32:
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if ((err = grub_efiemu_write_value
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(addr, sym.off + *addr - rel->r_offset
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- seg->off, sym.handle, seg->handle,
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seg->ptv_rel_needed, sizeof (grub_uint32_t))))
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return err;
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break;
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default:
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return grub_error (GRUB_ERR_BAD_OS,
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"unrecognised relocation");
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}
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}
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}
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}
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return GRUB_ERR_NONE;
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}
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