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- /*
- * 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>
- .p2align 2
- VARIABLE(grub_relocator_backward_start)
- /* mov imm32, %eax */
- .byte 0xb8
- VARIABLE(grub_relocator_backward_dest)
- .long 0
- movl %eax, %edi
- /* mov imm32, %eax */
- .byte 0xb8
- VARIABLE(grub_relocator_backward_src)
- .long 0
- movl %eax, %esi
- /* mov imm32, %ecx */
- .byte 0xb9
- VARIABLE(grub_relocator_backward_chunk_size)
- .long 0
-
- add %ecx, %esi
- add %ecx, %edi
- /* Backward movsb is implicitly off-by-one. compensate that. */
- sub $1, %esi
- sub $1, %edi
- /* Backward copy. */
- std
- rep
- movsb
- VARIABLE(grub_relocator_backward_end)
- VARIABLE(grub_relocator_forward_start)
- /* mov imm32, %eax */
- .byte 0xb8
- VARIABLE(grub_relocator_forward_dest)
- .long 0
- movl %eax, %edi
- /* mov imm32, %rax */
- .byte 0xb8
- VARIABLE(grub_relocator_forward_src)
- .long 0
- movl %eax, %esi
- /* mov imm32, %ecx */
- .byte 0xb9
- VARIABLE(grub_relocator_forward_chunk_size)
- .long 0
- /* Forward copy. */
- cld
- rep
- movsb
- VARIABLE(grub_relocator_forward_end)
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