From 6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 18:29:51 +0200 Subject: Adding upstream version 2.06. Signed-off-by: Daniel Baumann --- grub-core/lib/i386/relocator_asm.S | 80 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 grub-core/lib/i386/relocator_asm.S (limited to 'grub-core/lib/i386/relocator_asm.S') diff --git a/grub-core/lib/i386/relocator_asm.S b/grub-core/lib/i386/relocator_asm.S new file mode 100644 index 0000000..f273586 --- /dev/null +++ b/grub-core/lib/i386/relocator_asm.S @@ -0,0 +1,80 @@ +/* + * 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 . + */ + +#include +#include + + .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) -- cgit v1.2.3