1 .globl _tas
2 _tas:
3 	movl $0xCAFEBABE, %eax
4 	movl 4(%esp), %ecx
5 	xchgl %eax, 0(%ecx)
6 	ret
7 
8 .globl getmcontext
9 getmcontext:
10 	movl	4(%esp), %eax
11 
12 	movl	%fs, 8(%eax)
13 	movl	%es, 12(%eax)
14 	movl	%ds, 16(%eax)
15 	movl	%ss, 76(%eax)
16 	movl	%edi, 20(%eax)
17 	movl	%esi, 24(%eax)
18 	movl	%ebp, 28(%eax)
19 	movl	%ebx, 36(%eax)
20 	movl	%edx, 40(%eax)		 
21 	movl	%ecx, 44(%eax)
22 
23 	movl	$1, 48(%eax)	/* %eax */
24 	movl	(%esp), %ecx	/* %eip */
25 	movl	%ecx, 60(%eax)
26 	leal	4(%esp), %ecx	/* %esp */
27 	movl	%ecx, 72(%eax)
28 
29 	movl	44(%eax), %ecx	/* restore %ecx */
30 	movl	$0, %eax
31 	ret
32 
33 .globl setmcontext
34 setmcontext:
35 	movl	4(%esp), %eax
36 
37 	movl	8(%eax), %fs
38 	movl	12(%eax), %es
39 	movl	16(%eax), %ds
40 	movl	76(%eax), %ss
41 	movl	20(%eax), %edi
42 	movl	24(%eax), %esi
43 	movl	28(%eax), %ebp
44 	movl	36(%eax), %ebx
45 	movl	40(%eax), %edx
46 	movl	44(%eax), %ecx
47 
48 	movl	72(%eax), %esp
49 	pushl	60(%eax)	/* new %eip */
50 	movl	48(%eax), %eax
51 	ret
52