Self-relocation code for i386.

1 files changed, 50 insertions, 1 deletions

diff --git a/lib/csu/i386/md_init.h b/lib/csu/i386/md_init.h
index 584af51599d..11a84c367f1 100644
--- a/lib/csu/i386/md_init.h
+++ b/lib/csu/i386/md_init.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: md_init.h,v 1.4 2013/12/03 06:21:41 guenther Exp $ */
+/* $OpenBSD: md_init.h,v 1.5 2014/12/22 21:58:25 kurt Exp $ */
 
 /*-
  * Copyright (c) 2001 Ross Harvey
@@ -84,3 +84,52 @@
 	"	xorl	%ebp,%ebp	# mark deepest stack frame\n" \
 	"	call	___start		\n" \
 	"	.previous")
+
+#define	MD_RCRT0_START				\
+	__asm(					\
+	".text					\n" \
+	"	.align	4			\n" \
+	"	.globl	__start			\n" \
+	"	.globl	_start			\n" \
+	"_start:				\n" \
+	"__start:				\n" \
+	"	movl	%esp,%eax	# save SP for dl_boot_bind \n" \
+	"	subl	$16*4,%esp 	# allocate dl_data \n" \
+	"	pushl	$0	# push 0 for dynamicp (unused on i386) \n" \
+	"	movl	%esp,%ebx		\n" \
+	"	pushl	%ebx		# push dl_data for dl_boot_bind \n" \
+	"					\n" \
+	"	mov	%eax, %esi	# save stack for ___start \n" \
+	"	pushl	%eax		# push saved SP for dl_boot_bind \n" \
+	"					\n" \
+	"	call	_dl_boot_bind@PLT # _dl_boot_bind(sp,dl_data,0) \n" \
+	"	addl	$3*4,%esp	# pop args \n" \
+	"					\n" \
+	"	movl	%esi,%ebp		\n" \
+	"	andl	$~15,%esp	# align stack\n" \
+	"	pushl	$0		# cleanup\n" \
+	"	movl	0(%ebp),%eax	# argc	\n" \
+	"	leal	8(%ebp,%eax,4),%ecx #envp \n" \
+	"	leal	4(%ebp),%edx	# argv	\n" \
+	"	pushl	%ecx			\n" \
+	"	pushl	%edx			\n" \
+	"	pushl	%eax			\n" \
+	"	xorl	%ebp,%ebp	# mark deepest stack frame\n" \
+	"	call	___start	# ___start(argc,argv,envp,0) \n" \
+	"					\n" \
+	".text					\n" \
+	"	.align	4			\n" \
+	"	.globl	_dl_printf		\n" \
+	"	.type	_dl_printf,@function	\n" \
+	"_dl_printf:				\n" \
+	"	ret				\n" \
+	"					\n" \
+	".text					\n" \
+	"	.align	4			\n" \
+	"	.globl	_dl_exit		\n" \
+	"	.type	_dl_exit,@function	\n" \
+	"_dl_exit:				\n" \
+	"	mov	$1, %eax		\n" \
+	"	int	$0x80			\n" \
+	"	ret				\n" \
+	"	.previous")