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/* dl.c - arch-dependent part of loadable module support */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002,2004,2005,2007,2009 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/mm.h>
#include <grub/i18n.h>
#include <grub/ia64/reloc.h>
#define MASK19 ((1 << 19) - 1)
#define MASK20 ((1 << 20) - 1)
/* Check if EHDR is a valid ELF header. */
grub_err_t
grub_arch_dl_check_header (void *ehdr)
{
Elf_Ehdr *e = ehdr;
/* Check the magic numbers. */
if (e->e_ident[EI_CLASS] != ELFCLASS64
|| e->e_ident[EI_DATA] != ELFDATA2LSB
|| e->e_machine != EM_IA_64)
return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
return GRUB_ERR_NONE;
}
#pragma GCC diagnostic ignored "-Wcast-align"
/* Relocate symbols. */
grub_err_t
grub_arch_dl_relocate_symbols (grub_dl_t mod, void *ehdr,
Elf_Shdr *s, grub_dl_segment_t seg)
{
Elf_Rela *rel, *max;
for (rel = (Elf_Rela *) ((char *) ehdr + s->sh_offset),
max = (Elf_Rela *) ((char *) rel + s->sh_size);
rel < max;
rel = (Elf_Rela *) ((char *) rel + s->sh_entsize))
{
grub_addr_t addr;
Elf_Sym *sym;
grub_uint64_t value;
if (seg->size < (rel->r_offset & ~3))
return grub_error (GRUB_ERR_BAD_MODULE,
"reloc offset is out of the segment");
addr = (grub_addr_t) seg->addr + rel->r_offset;
sym = (Elf_Sym *) ((char *) mod->symtab
+ mod->symsize * ELF_R_SYM (rel->r_info));
/* On the PPC the value does not have an explicit
addend, add it. */
value = sym->st_value + rel->r_addend;
switch (ELF_R_TYPE (rel->r_info))
{
case R_IA64_PCREL21B:
{
grub_int64_t noff;
if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
{
struct grub_ia64_trampoline *tr = mod->trampptr;
grub_ia64_make_trampoline (tr, value);
noff = ((char *) tr - (char *) (addr & ~3)) >> 4;
mod->trampptr = tr + 1;
}
else
noff = ((char *) value - (char *) (addr & ~3)) >> 4;
if ((noff & ~MASK19) && ((-noff) & ~MASK19))
return grub_error (GRUB_ERR_BAD_MODULE,
"jump offset too big (%lx)", noff);
grub_ia64_add_value_to_slot_20b (addr, noff);
}
break;
case R_IA64_SEGREL64LSB:
*(grub_uint64_t *) addr += value - (grub_addr_t) seg->addr;
break;
case R_IA64_FPTR64LSB:
case R_IA64_DIR64LSB:
*(grub_uint64_t *) addr += value;
break;
case R_IA64_PCREL64LSB:
*(grub_uint64_t *) addr += value - addr;
break;
case R_IA64_GPREL64I:
grub_ia64_set_immu64 (addr, value - (grub_addr_t) mod->base);
break;
case R_IA64_GPREL22:
if ((value - (grub_addr_t) mod->base) & ~MASK20)
return grub_error (GRUB_ERR_BAD_MODULE,
"gprel offset too big (%lx)",
value - (grub_addr_t) mod->base);
grub_ia64_add_value_to_slot_21 (addr, value - (grub_addr_t) mod->base);
break;
case R_IA64_LTOFF22X:
case R_IA64_LTOFF22:
if (ELF_ST_TYPE (sym->st_info) == STT_FUNC)
value = *(grub_uint64_t *) sym->st_value + rel->r_addend;
/* Fallthrough. */
case R_IA64_LTOFF_FPTR22:
{
grub_uint64_t *gpptr = mod->gotptr;
*gpptr = value;
if (((grub_addr_t) gpptr - (grub_addr_t) mod->base) & ~MASK20)
return grub_error (GRUB_ERR_BAD_MODULE,
"gprel offset too big (%lx)",
(grub_addr_t) gpptr - (grub_addr_t) mod->base);
grub_ia64_add_value_to_slot_21 (addr, (grub_addr_t) gpptr - (grub_addr_t) mod->base);
mod->gotptr = gpptr + 1;
break;
}
/* We treat LTOFF22X as LTOFF22, so we can ignore LDXMOV. */
case R_IA64_LDXMOV:
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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