145 lines
4.4 KiB
C
145 lines
4.4 KiB
C
/* dl.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) 2002,2004,2005,2007,2009 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/mm.h>
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#include <grub/i18n.h>
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#include <grub/ia64/reloc.h>
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#define MASK19 ((1 << 19) - 1)
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#define MASK20 ((1 << 20) - 1)
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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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Elf_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_IA_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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#pragma GCC diagnostic ignored "-Wcast-align"
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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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Elf_Rela *rel, *max;
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for (rel = (Elf_Rela *) ((char *) ehdr + s->sh_offset),
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max = (Elf_Rela *) ((char *) rel + s->sh_size);
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rel < max;
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rel = (Elf_Rela *) ((char *) rel + s->sh_entsize))
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{
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grub_addr_t addr;
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Elf_Sym *sym;
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grub_uint64_t value;
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if (seg->size < (rel->r_offset & ~3))
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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 = (grub_addr_t) seg->addr + rel->r_offset;
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sym = (Elf_Sym *) ((char *) mod->symtab
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+ mod->symsize * ELF_R_SYM (rel->r_info));
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/* On the PPC the value does not have an explicit
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addend, add it. */
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value = sym->st_value + rel->r_addend;
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switch (ELF_R_TYPE (rel->r_info))
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{
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case R_IA64_PCREL21B:
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{
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grub_int64_t noff;
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if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
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{
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struct grub_ia64_trampoline *tr = mod->trampptr;
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grub_ia64_make_trampoline (tr, value);
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noff = ((char *) tr - (char *) (addr & ~3)) >> 4;
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mod->trampptr = tr + 1;
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}
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else
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noff = ((char *) value - (char *) (addr & ~3)) >> 4;
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if ((noff & ~MASK19) && ((-noff) & ~MASK19))
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return grub_error (GRUB_ERR_BAD_MODULE,
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"jump offset too big (%lx)", noff);
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grub_ia64_add_value_to_slot_20b (addr, noff);
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}
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break;
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case R_IA64_SEGREL64LSB:
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*(grub_uint64_t *) addr += value - (grub_addr_t) seg->addr;
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break;
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case R_IA64_FPTR64LSB:
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case R_IA64_DIR64LSB:
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*(grub_uint64_t *) addr += value;
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break;
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case R_IA64_PCREL64LSB:
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*(grub_uint64_t *) addr += value - addr;
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break;
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case R_IA64_GPREL64I:
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grub_ia64_set_immu64 (addr, value - (grub_addr_t) mod->base);
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break;
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case R_IA64_GPREL22:
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if ((value - (grub_addr_t) mod->base) & ~MASK20)
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return grub_error (GRUB_ERR_BAD_MODULE,
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"gprel offset too big (%lx)",
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value - (grub_addr_t) mod->base);
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grub_ia64_add_value_to_slot_21 (addr, value - (grub_addr_t) mod->base);
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break;
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case R_IA64_LTOFF22X:
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case R_IA64_LTOFF22:
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if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
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value = *(grub_uint64_t *) sym->st_value + rel->r_addend;
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/* Fallthrough. */
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case R_IA64_LTOFF_FPTR22:
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{
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grub_uint64_t *gpptr = mod->gotptr;
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*gpptr = value;
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if (((grub_addr_t) gpptr - (grub_addr_t) mod->base) & ~MASK20)
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return grub_error (GRUB_ERR_BAD_MODULE,
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"gprel offset too big (%lx)",
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(grub_addr_t) gpptr - (grub_addr_t) mod->base);
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grub_ia64_add_value_to_slot_21 (addr, (grub_addr_t) gpptr - (grub_addr_t) mod->base);
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mod->gotptr = gpptr + 1;
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break;
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}
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/* We treat LTOFF22X as LTOFF22, so we can ignore LDXMOV. */
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case R_IA64_LDXMOV:
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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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