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/
/ our buffer looks like:
/  eax,ebx,ecx,edx,esi,edi,esp,ebp,pc
/
/ _longjmp is called with two parameters:  jmp_buf*,int
/ jmp_buf* is at 4(%esp), int is at 8(%esp)
/ retaddr is, of course, at (%esp)

        .globl  _longjmp
        .globl  longjmp
_longjmp:
longjmp:
        movl    4(%esp), %ebx   / address of buf
        movl    8(%esp), %eax   / store return value

        movl    24(%ebx), %esp  / restore stack
        movl    32(%ebx), %edi
/ Next line sets up return address.
        movl    %edi, 0(%esp)   
        movl    8(%ebx), %ecx
        movl    12(%ebx), %edx
        movl    16(%ebx), %esi
        movl    20(%ebx), %edi
        movl    28(%ebx), %ebp
        movl    4(%ebx), %ebx
        testl   %eax,%eax
        jne     bye
        incl    %eax            / eax hold 0 if we are here
bye:
        ret