102 lines
3.1 KiB
C
102 lines
3.1 KiB
C
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 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/mm.h>
|
|
#include <grub/misc.h>
|
|
|
|
#include <grub/types.h>
|
|
#include <grub/types.h>
|
|
#include <grub/err.h>
|
|
|
|
#include <grub/mips/relocator.h>
|
|
|
|
/* Remark: doesn't work with source outside of 4G.
|
|
Use relocator64 in this case.
|
|
*/
|
|
|
|
extern grub_uint8_t grub_relocator32_forward_start;
|
|
extern grub_uint8_t grub_relocator32_forward_end;
|
|
extern grub_uint8_t grub_relocator32_backward_start;
|
|
extern grub_uint8_t grub_relocator32_backward_end;
|
|
|
|
#define REGW_SIZEOF (2 * sizeof (grub_uint32_t))
|
|
#define JUMP_SIZEOF (sizeof (grub_uint32_t))
|
|
|
|
#define RELOCATOR_SRC_SIZEOF(x) (&grub_relocator32_##x##_end \
|
|
- &grub_relocator32_##x##_start)
|
|
#define RELOCATOR_SIZEOF(x) (RELOCATOR_SRC_SIZEOF(x) \
|
|
+ REGW_SIZEOF * (31 + 3) + JUMP_SIZEOF)
|
|
#define RELOCATOR_ALIGN 16
|
|
|
|
#define PREFIX(x) grub_relocator32_ ## x
|
|
|
|
static void
|
|
write_reg (int regn, grub_uint32_t val, void **target)
|
|
{
|
|
/* lui $r, (val+0x8000). */
|
|
*(grub_uint32_t *) *target = ((0x3c00 | regn) << 16) | ((val + 0x8000) >> 16);
|
|
*target = ((grub_uint32_t *) *target) + 1;
|
|
/* addiu $r, $r, val. */
|
|
*(grub_uint32_t *) *target = (((0x2400 | regn << 5 | regn) << 16)
|
|
| ((val + 0x8000) >> 16));
|
|
*target = ((grub_uint32_t *) *target) + 1;
|
|
}
|
|
|
|
static void
|
|
write_jump (int regn, void **target)
|
|
{
|
|
/* j $r. */
|
|
*(grub_uint32_t *) *target = (regn<<21) | 0x8;
|
|
*target = ((grub_uint32_t *) *target) + 1;
|
|
}
|
|
|
|
static void
|
|
write_call_relocator_bw (void *ptr0, void *src, grub_uint32_t dest,
|
|
grub_size_t size, struct grub_relocator32_state state)
|
|
{
|
|
void *ptr = ptr0;
|
|
int i;
|
|
write_reg (1, (grub_uint32_t) src, &ptr);
|
|
write_reg (2, dest, &ptr);
|
|
write_reg (3, size, &ptr);
|
|
grub_memcpy (ptr, &grub_relocator32_backward_start,
|
|
RELOCATOR_SRC_SIZEOF (backward));
|
|
for (i = 1; i < 32; i++)
|
|
write_reg (i, state.gpr[i], &ptr);
|
|
write_jump (state.jumpreg, &ptr);
|
|
((void (*) ())ptr0) ();
|
|
}
|
|
|
|
static void
|
|
write_call_relocator_fw (void *ptr0, void *src, grub_uint32_t dest,
|
|
grub_size_t size, struct grub_relocator32_state state)
|
|
{
|
|
void *ptr = ptr0;
|
|
int i;
|
|
write_reg (1, (grub_uint32_t) src, &ptr);
|
|
write_reg (2, dest, &ptr);
|
|
write_reg (3, size, &ptr);
|
|
grub_memcpy (ptr, &grub_relocator32_forward_start,
|
|
RELOCATOR_SRC_SIZEOF (forward));
|
|
for (i = 1; i < 32; i++)
|
|
write_reg (i, state.gpr[i], &ptr);
|
|
write_jump (state.jumpreg, &ptr);
|
|
((void (*) ())ptr0) ();
|
|
}
|
|
|
|
#include "../relocator.c"
|