vx32

commit 261ae7f9ebdff175fc43fa6067de6abb4df1d52f
parent c144c04d93a9215b1749322cbebef45f043474a6
Author: Russ Cox <rsc@swtch.com>
Date:   Sat, 28 Jun 2008 12:35:40 -0400

libvx32/OSX: add forgotten darwin-asm.S

Diffstat:
src/libvx32/darwin-asm.S
 | 
37
+++++++++++++++++++++++++++++++++++++

1 file changed, 37 insertions(+), 0 deletions(-)
diff --git a/src/libvx32/darwin-asm.S b/src/libvx32/darwin-asm.S
@@ -0,0 +1,37 @@
+// Context routines for OS X
+
+// vx32_getcontext(struct i386_thread_state *ss);  
+// see /usr/include/mach/i386/thread_status.h for layout.
+// not traditional intel layout!
+
+.globl _vx32_getcontext
+_vx32_getcontext:
+	movl 4(%esp), %eax
+	
+	movl $1, 0(%eax) /* %eax */
+	movl %ebx, 4(%eax)
+	movl %ecx, 8(%eax)
+	movl %edx, 12(%eax)
+	movl %edi, 16(%eax)
+	movl %esi, 20(%eax)
+	movl %ebp, 24(%eax)
+	/* 28(%eax) is esp */
+	movl %ss, 32(%eax)
+	pushfl
+	popl 36(%eax)
+	/* 40(%eax) is eip */
+	movl %cs, 44(%eax)
+	movl %ds, 48(%eax)
+	movl %es, 52(%eax)
+	movl %fs, 56(%eax)
+	movl %gs, 60(%eax)
+	
+	movl 0(%esp), %ecx		/* %eip */
+	movl %ecx, 40(%eax)
+	leal 4(%esp), %ecx		/* %esp */
+	movl %ecx, 28(%eax)
+	
+	movl 8(%eax), %ecx		/* restore %ecx */
+	movl $0, %eax
+	ret
+