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