1 files changed, 65 insertions, 0 deletions
diff --git a/libc-parts/x86-64-crt0.S b/libc-parts/x86-64-crt0.S
new file mode 100644
index 0000000..d882be2
--- /dev/null
+++ b/libc-parts/x86-64-crt0.S
@@ -0,0 +1,65 @@
+/* x86-64-crt0.S - Startup code for x86-64.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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 2, or (at
+   your option) any later version.
+
+   The GNU Hurd 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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */
+
+/* The size of our initial stack (32 pages).  */
+#define STACK_SIZE			0x32000
+	
+	.text
+
+	.globl	start, _start
+start:
+_start:
+	/* The location of the Hurd startup data is stored in rsp.  */
+	movq	%rsp, __hurd_startup_data
+
+	/* Initialize the stack pointer.  */
+	movq	$(stack + STACK_SIZE), %rsp
+
+	/* Reset EFLAGS.  */
+	pushq	$0
+	popf
+
+	/* Now enter the cmain function.  Instead of using call, we
+	jump and put a return address of 0 on the stack.  We also zeor
+	the frame pointer.  In this way, __builtin_return_address
+	works more reliably.  */
+	pushq $0
+	xor %ebp, %ebp
+	jmp cmain
+
+	/* Not reached.  */
+loop:	hlt
+	jmp	loop
+
+	.data
+
+	/* Our stack area.  */
+	.global stack, _stack
+stack:
+_stack:	
+	.align 0x1000
+	.fill STACK_SIZE, 1
+	.global stack_end, _stack_end
+stack_end:	
+_stack_end:
+
+	/* This variable holds a pointer to the Hurd startup data.  */
+	.global __hurd_startup_data
+__hurd_startup_data:
+	.long	0