2010-01-09 23:30:33 +00:00
|
|
|
/*
|
|
|
|
|
* 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/symbol.h>
|
|
|
|
|
#include <grub/i386/memory.h>
|
|
|
|
|
|
2010-01-10 17:59:31 +00:00
|
|
|
.p2align 2
|
|
|
|
|
|
2010-01-09 23:30:33 +00:00
|
|
|
VARIABLE(grub_relocator_backward_start)
|
|
|
|
|
/* mov imm32, %rax */
|
|
|
|
|
.byte 0x48
|
|
|
|
|
.byte 0xb8
|
2010-01-11 12:40:59 +00:00
|
|
|
VARIABLE(grub_relocator_backward_dest)
|
2010-01-09 23:30:33 +00:00
|
|
|
.long 0, 0
|
|
|
|
|
movq %rax, %rdi
|
|
|
|
|
|
|
|
|
|
/* mov imm64, %rax */
|
|
|
|
|
.byte 0x48
|
|
|
|
|
.byte 0xb8
|
2010-01-11 12:40:59 +00:00
|
|
|
VARIABLE(grub_relocator_backward_src)
|
2010-01-09 23:30:33 +00:00
|
|
|
.long 0, 0
|
|
|
|
|
movq %rax, %rsi
|
|
|
|
|
|
2010-01-11 12:42:45 +00:00
|
|
|
/* mov imm64, %rcx */
|
2010-01-09 23:30:33 +00:00
|
|
|
.byte 0x48
|
|
|
|
|
.byte 0xb9
|
2010-01-11 12:40:59 +00:00
|
|
|
VARIABLE(grub_relocator_backward_chunk_size)
|
2010-01-09 23:30:33 +00:00
|
|
|
.long 0, 0
|
|
|
|
|
|
|
|
|
|
add %rcx, %rsi
|
|
|
|
|
add %rcx, %rdi
|
|
|
|
|
|
|
|
|
|
/* Backward movsb is implicitly off-by-one. compensate that. */
|
|
|
|
|
sub $1, %rsi
|
|
|
|
|
sub $1, %rdi
|
|
|
|
|
|
|
|
|
|
/* Backward copy. */
|
|
|
|
|
std
|
|
|
|
|
|
|
|
|
|
rep
|
|
|
|
|
movsb
|
|
|
|
|
VARIABLE(grub_relocator_backward_end)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
VARIABLE(grub_relocator_forward_start)
|
|
|
|
|
/* mov imm64, %rax */
|
|
|
|
|
.byte 0x48
|
|
|
|
|
.byte 0xb8
|
|
|
|
|
VARIABLE(grub_relocator_forward_dest)
|
|
|
|
|
.long 0, 0
|
|
|
|
|
movq %rax, %rdi
|
|
|
|
|
|
|
|
|
|
/* mov imm64, %rax */
|
|
|
|
|
.byte 0x48
|
|
|
|
|
.byte 0xb8
|
|
|
|
|
VARIABLE(grub_relocator_forward_src)
|
|
|
|
|
.long 0, 0
|
|
|
|
|
movq %rax, %rsi
|
|
|
|
|
|
|
|
|
|
/* mov imm64, %rcx */
|
|
|
|
|
.byte 0x48
|
|
|
|
|
.byte 0xb9
|
2010-01-11 12:40:59 +00:00
|
|
|
VARIABLE(grub_relocator_forward_chunk_size)
|
2010-01-09 23:30:33 +00:00
|
|
|
.long 0, 0
|
|
|
|
|
|
|
|
|
|
/* Forward copy. */
|
|
|
|
|
cld
|
|
|
|
|
rep
|
|
|
|
|
movsb
|
|
|
|
|
VARIABLE(grub_relocator_forward_end)
|
