arch/x86/um/setjmp_32.S

   1 #
   2 # arch/i386/setjmp.S
   3 #
   4 # setjmp/longjmp for the i386 architecture
   5 #
   6
   7 #
   8 # The jmp_buf is assumed to contain the following, in order:
   9 #       %ebx
  10 #       %esp
  11 #       %ebp
  12 #       %esi
  13 #       %edi
  14 #       <return address>
  15 #
  16
  17         .text
  18         .align 4
  19         .globl setjmp
  20         .type setjmp, @function
  21 setjmp:
  22 #ifdef _REGPARM
  23         movl %eax,%edx
  24 #else
  25         movl 4(%esp),%edx
  26 #endif
  27         popl %ecx                       # Return address, and adjust the stack
  28         xorl %eax,%eax                  # Return value
  29         movl %ebx,(%edx)
  30         movl %esp,4(%edx)               # Post-return %esp!
  31         pushl %ecx                      # Make the call/return stack happy
  32         movl %ebp,8(%edx)
  33         movl %esi,12(%edx)
  34         movl %edi,16(%edx)
  35         movl %ecx,20(%edx)              # Return address
  36         ret
  37
  38         .size setjmp,.-setjmp
  39
  40         .text
  41         .align 4
  42         .globl longjmp
  43         .type longjmp, @function
  44 longjmp:
  45 #ifdef _REGPARM
  46         xchgl %eax,%edx
  47 #else
  48         movl 4(%esp),%edx               # jmp_ptr address
  49         movl 8(%esp),%eax               # Return value
  50 #endif
  51         movl (%edx),%ebx
  52         movl 4(%edx),%esp
  53         movl 8(%edx),%ebp
  54         movl 12(%edx),%esi
  55         movl 16(%edx),%edi
  56         jmp *20(%edx)
  57
  58         .size longjmp,.-longjmp