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