toolchain/gcc/newlib/libc/sys/sysvi386/_longjmp.s

   1 /
   2 / our buffer looks like:
   3 /  eax,ebx,ecx,edx,esi,edi,esp,ebp,pc
   4 /
   5 / _longjmp is called with two parameters:  jmp_buf*,int
   6 / jmp_buf* is at 4(%esp), int is at 8(%esp)
   7 / retaddr is, of course, at (%esp)
   8
   9         .globl  _longjmp
  10         .globl  longjmp
  11 _longjmp:
  12 longjmp:
  13         movl    4(%esp), %ebx   / address of buf
  14         movl    8(%esp), %eax   / store return value
  15
  16         movl    24(%ebx), %esp  / restore stack
  17         movl    32(%ebx), %edi
  18 / Next line sets up return address.
  19         movl    %edi, 0(%esp)
  20         movl    8(%ebx), %ecx
  21         movl    12(%ebx), %edx
  22         movl    16(%ebx), %esi
  23         movl    20(%ebx), %edi
  24         movl    28(%ebx), %ebp
  25         movl    4(%ebx), %ebx
  26         testl   %eax,%eax
  27         jne     bye
  28         incl    %eax            / eax hold 0 if we are here
  29 bye:
  30         ret
  31