2N/A/*
2N/A * GRUB -- GRand Unified Bootloader
2N/A * Copyright (C) 2009 Free Software Foundation, Inc.
2N/A *
2N/A * GRUB is free software: you can redistribute it and/or modify
2N/A * it under the terms of the GNU General Public License as published by
2N/A * the Free Software Foundation, either version 3 of the License, or
2N/A * (at your option) any later version.
2N/A *
2N/A * GRUB is distributed in the hope that it will be useful,
2N/A * but WITHOUT ANY WARRANTY; without even the implied warranty of
2N/A * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
2N/A * GNU General Public License for more details.
2N/A *
2N/A * You should have received a copy of the GNU General Public License
2N/A * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
2N/A */
2N/A
2N/A#include <grub/symbol.h>
2N/A#include <grub/i386/memory.h>
2N/A
2N/A .p2align 2
2N/A
2N/AVARIABLE(grub_relocator_backward_start)
2N/A /* mov imm32, %rax */
2N/A .byte 0x48
2N/A .byte 0xb8
2N/AVARIABLE(grub_relocator_backward_dest)
2N/A .long 0, 0
2N/A movq %rax, %rdi
2N/A
2N/A /* mov imm64, %rax */
2N/A .byte 0x48
2N/A .byte 0xb8
2N/AVARIABLE(grub_relocator_backward_src)
2N/A .long 0, 0
2N/A movq %rax, %rsi
2N/A
2N/A /* mov imm64, %rcx */
2N/A .byte 0x48
2N/A .byte 0xb9
2N/AVARIABLE(grub_relocator_backward_chunk_size)
2N/A .long 0, 0
2N/A
2N/A add %rcx, %rsi
2N/A add %rcx, %rdi
2N/A
2N/A /* Backward movsb is implicitly off-by-one. compensate that. */
2N/A sub $1, %rsi
2N/A sub $1, %rdi
2N/A
2N/A /* Backward copy. */
2N/A std
2N/A
2N/A rep
2N/A movsb
2N/AVARIABLE(grub_relocator_backward_end)
2N/A
2N/A
2N/AVARIABLE(grub_relocator_forward_start)
2N/A /* mov imm64, %rax */
2N/A .byte 0x48
2N/A .byte 0xb8
2N/AVARIABLE(grub_relocator_forward_dest)
2N/A .long 0, 0
2N/A movq %rax, %rdi
2N/A
2N/A /* mov imm64, %rax */
2N/A .byte 0x48
2N/A .byte 0xb8
2N/AVARIABLE(grub_relocator_forward_src)
2N/A .long 0, 0
2N/A movq %rax, %rsi
2N/A
2N/A /* mov imm64, %rcx */
2N/A .byte 0x48
2N/A .byte 0xb9
2N/AVARIABLE(grub_relocator_forward_chunk_size)
2N/A .long 0, 0
2N/A
2N/A /* Forward copy. */
2N/A cld
2N/A rep
2N/A movsb
2N/AVARIABLE(grub_relocator_forward_end)