| Jeff Dike | 13c06be | 2006-09-25 23:32:59 -0700 | [diff] [blame^] | 1 | # |
| 2 | # arch/x86_64/setjmp.S |
| 3 | # |
| 4 | # setjmp/longjmp for the x86-64 architecture |
| 5 | # |
| 6 | |
| 7 | # |
| 8 | # The jmp_buf is assumed to contain the following, in order: |
| 9 | # %rbx |
| 10 | # %rsp (post-return) |
| 11 | # %rbp |
| 12 | # %r12 |
| 13 | # %r13 |
| 14 | # %r14 |
| 15 | # %r15 |
| 16 | # <return address> |
| 17 | # |
| 18 | |
| 19 | .text |
| 20 | .align 4 |
| 21 | .globl setjmp |
| 22 | .type setjmp, @function |
| 23 | setjmp: |
| 24 | pop %rsi # Return address, and adjust the stack |
| 25 | xorl %eax,%eax # Return value |
| 26 | movq %rbx,(%rdi) |
| 27 | movq %rsp,8(%rdi) # Post-return %rsp! |
| 28 | push %rsi # Make the call/return stack happy |
| 29 | movq %rbp,16(%rdi) |
| 30 | movq %r12,24(%rdi) |
| 31 | movq %r13,32(%rdi) |
| 32 | movq %r14,40(%rdi) |
| 33 | movq %r15,48(%rdi) |
| 34 | movq %rsi,56(%rdi) # Return address |
| 35 | ret |
| 36 | |
| 37 | .size setjmp,.-setjmp |
| 38 | |
| 39 | .text |
| 40 | .align 4 |
| 41 | .globl longjmp |
| 42 | .type longjmp, @function |
| 43 | longjmp: |
| 44 | movl %esi,%eax # Return value (int) |
| 45 | movq (%rdi),%rbx |
| 46 | movq 8(%rdi),%rsp |
| 47 | movq 16(%rdi),%rbp |
| 48 | movq 24(%rdi),%r12 |
| 49 | movq 32(%rdi),%r13 |
| 50 | movq 40(%rdi),%r14 |
| 51 | movq 48(%rdi),%r15 |
| 52 | jmp *56(%rdi) |
| 53 | |
| 54 | .size longjmp,.-longjmp |