| Jeff Dike | 13c06be | 2006-09-25 23:32:59 -0700 | [diff] [blame] | 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 |