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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/i18n.h>
/* 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] != ELFDATA2MSB
|| e->e_machine != EM_SPARCV9)
return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
return GRUB_ERR_NONE;
}
#pragma GCC diagnostic ignored "-Wcast-align"
struct trampoline
{
grub_uint8_t code[0x28];
grub_uint64_t addr;
};
static const grub_uint8_t trampoline_code[0x28] =
{
/* 0: */ 0x82, 0x10, 0x00, 0x0f, /* mov %o7, %g1 */
/* 4: */ 0x40, 0x00, 0x00, 0x02, /* call 0xc */
/* 8: */ 0x01, 0x00, 0x00, 0x00, /* nop */
/* c: */ 0x9e, 0x1b, 0xc0, 0x01, /* xor %o7, %g1, %o7 */
/* 10: */ 0x82, 0x18, 0x40, 0x0f, /* xor %g1, %o7, %g1 */
/* 14: */ 0x9e, 0x1b, 0xc0, 0x01, /* xor %o7, %g1, %o7 */
/* 18: */ 0xc2, 0x58, 0x60, 0x24, /* ldx [ %g1 + 0x24 ], %g1 */
/* 1c: */ 0x81, 0xc0, 0x40, 0x00, /* jmp %g1 */
/* 20: */ 0x01, 0x00, 0x00, 0x00, /* nop */
/* 24: */ 0x01, 0x00, 0x00, 0x00, /* nop */
};
grub_err_t
grub_arch_dl_get_tramp_got_size (const void *ehdr, grub_size_t *tramp,
grub_size_t *got)
{
const Elf_Ehdr *e = ehdr;
const Elf_Shdr *s;
unsigned i;
*tramp = 0;
*got = 0;
for (i = 0, s = (const Elf_Shdr *) ((grub_addr_t) e + e->e_shoff);
i < e->e_shnum;
i++, s = (const Elf_Shdr *) ((grub_addr_t) s + e->e_shentsize))
if (s->sh_type == SHT_REL || s->sh_type == SHT_RELA)
{
const Elf_Rel *rel, *max;
for (rel = (const Elf_Rel *) ((grub_addr_t) e + s->sh_offset),
max = rel + s->sh_size / s->sh_entsize;
rel < max;
rel = (const Elf_Rel *) ((grub_addr_t) rel + s->sh_entsize))
switch (ELF_R_TYPE (rel->r_info))
{
case R_SPARC_WDISP30:
{
*tramp += sizeof (struct trampoline);
break;
}
}
}
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)
{
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))
{
Elf_Word *addr;
Elf_Sym *sym;
Elf_Addr value;
if (seg->size < rel->r_offset)
return grub_error (GRUB_ERR_BAD_MODULE,
"reloc offset is out of the segment");
addr = (Elf_Word *) ((char *) seg->addr + rel->r_offset);
sym = (Elf_Sym *) ((char *) mod->symtab
+ mod->symsize * ELF_R_SYM (rel->r_info));
value = sym->st_value + rel->r_addend;
switch (ELF_R_TYPE (rel->r_info) & 0xff)
{
case R_SPARC_32: /* 3 V-word32 */
if (value & 0xFFFFFFFF00000000)
return grub_error (GRUB_ERR_BAD_MODULE,
"address out of 32 bits range");
*addr = value;
break;
case R_SPARC_WDISP30: /* 7 V-disp30 */
if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
(((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
!= 0xFFFFFFFF00000000))
{
struct trampoline *tp = mod->trampptr;
mod->trampptr = tp + 1;
grub_memcpy (tp->code, trampoline_code, sizeof (tp->code));
tp->addr = value;
value = (Elf_Addr) tp;
}
if (((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000) &&
(((value - (Elf_Addr) addr) & 0xFFFFFFFF00000000)
!= 0xFFFFFFFF00000000))
return grub_error (GRUB_ERR_BAD_MODULE,
"displacement out of 30 bits range");
*addr = (*addr & 0xC0000000) |
(((grub_int32_t) ((value - (Elf_Addr) addr) >> 2)) &
0x3FFFFFFF);
break;
case R_SPARC_HH22: /* 9 V-imm22 */
*addr = (*addr & 0xFFC00000) | ((value >> 42) & 0x3FFFFF);
break;
case R_SPARC_HM10: /* 12 T-simm13 */
*addr = (*addr & 0xFFFFFC00) | ((value >> 32) & 0x3FF);
break;
case R_SPARC_HI22: /* 9 V-imm22 */
if (value >> 32)
return grub_error (GRUB_ERR_BAD_MODULE,
"address out of 32 bits range");
case R_SPARC_LM22:
*addr = (*addr & 0xFFC00000) | ((value >> 10) & 0x3FFFFF);
break;
case R_SPARC_LO10: /* 12 T-simm13 */
*addr = (*addr & 0xFFFFFC00) | (value & 0x3FF);
break;
case R_SPARC_64: /* 32 V-xwords64 */
*(Elf_Xword *) addr = value;
break;
case R_SPARC_OLO10:
*addr = (*addr & ~0x1fff)
| (((value & 0x3ff) +
(ELF_R_TYPE (rel->r_info) >> 8))
& 0x1fff);
break;
default:
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
N_("relocation 0x%x is not implemented yet"),
ELF_R_TYPE (rel->r_info));
}
}
return GRUB_ERR_NONE;
}
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