First compileable newreloc

lib/x86_64/relocator_asm.S

@@ -0,0 +1,85 @@
+/*
+ *  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>
+
+VARIABLE(grub_relocator_backward_start)
+	/* mov imm32, %rax */
+	.byte	0x48
+	.byte	0xb8
+RELOCATOR_VARIABLE(dest)
+	.long	0, 0
+	movq	%rax, %rdi
+
+	/* mov imm64, %rax */
+	.byte	0x48
+	.byte	0xb8
+RELOCATOR_VARIABLE(src)
+	.long	0, 0
+	movq	%rax, %rsi
+
+	/* mov imm32, %ecx */
+	.byte	0x48
+	.byte	0xb9
+RELOCATOR_VARIABLE(size)
+	.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
+
+	xorq	%rcx, %rcx
+	/* mov imm64, %rcx */
+	.byte	0x48
+	.byte	0xb9
+VARIABLE(grub_relocator_forward_size)
+	.long	0, 0
+
+	/* Forward copy.  */
+	cld
+	rep
+	movsb
+VARIABLE(grub_relocator_forward_end)