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/* dl-386.c - arch-dependent part of loadable module support */
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002, 2005 Free Software Foundation, Inc.
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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 2 of the License, or
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* (at your option) any later version.
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* This program 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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* You should have received a copy of the GNU General Public License
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* along with GRUB; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <grub/misc.h>
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/* Check if EHDR is a valid ELF header. */
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grub_arch_dl_check_header (void *ehdr)
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/* Check the magic numbers. */
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if (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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return grub_error (GRUB_ERR_BAD_OS, "invalid arch specific ELF magic");
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/* Relocate symbols. */
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grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr)
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/* Find a symbol table. */
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for (i = 0, s = (Elf32_Shdr *) ((char *) e + e->e_shoff);
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i++, s = (Elf32_Shdr *) ((char *) s + e->e_shentsize))
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if (s->sh_type == SHT_SYMTAB)
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return grub_error (GRUB_ERR_BAD_MODULE, "no symtab found");
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symtab = (Elf32_Sym *) ((char *) e + s->sh_offset);
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entsize = s->sh_entsize;
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for (i = 0, s = (Elf32_Shdr *) ((char *) e + e->e_shoff);
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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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grub_dl_segment_t seg;
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/* Find the target segment. */
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for (seg = mod->segment; seg; seg = seg->next)
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if (seg->section == s->sh_info)
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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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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 *) ((char *) seg->addr + rel->r_offset);
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sym = (Elf32_Sym *) ((char *) symtab
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+ entsize * ELF32_R_SYM (rel->r_info));
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switch (ELF32_R_TYPE (rel->r_info))
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*addr += sym->st_value;
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*addr += (sym->st_value - (Elf32_Word) seg->addr
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return GRUB_ERR_NONE;