setjmp.s raw

   1  /* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */
   2  .global __setjmp
   3  .global _setjmp
   4  .global setjmp
   5  .type __setjmp,@function
   6  .type _setjmp,@function
   7  .type setjmp,@function
   8  __setjmp:
   9  _setjmp:
  10  setjmp:
  11  	mov %rbx,(%rdi)         /* rdi is jmp_buf, move registers onto it */
  12  	mov %rbp,8(%rdi)
  13  	mov %r12,16(%rdi)
  14  	mov %r13,24(%rdi)
  15  	mov %r14,32(%rdi)
  16  	mov %r15,40(%rdi)
  17  	lea 8(%rsp),%rdx        /* this is our rsp WITHOUT current ret addr */
  18  	mov %rdx,48(%rdi)
  19  	mov (%rsp),%rdx         /* save return addr ptr for new rip */
  20  	mov %rdx,56(%rdi)
  21  	xor %eax,%eax           /* always return 0 */
  22  	ret
  23