[musl] / src / setjmp / x86_64 / setjmp.s

/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
.global __setjmp
.global _setjmp
.global setjmp
__setjmp:
_setjmp:
setjmp:
        mov %rbx,(%rdi)         /* rdi is jmp_buf, move registers onto it */
        mov %rbp,8(%rdi)
        mov %r12,16(%rdi)
        mov %r13,24(%rdi)
        mov %r14,32(%rdi)
        mov %r15,40(%rdi)
        lea 8(%rsp),%rdx        /* this is our rsp WITHOUT current ret addr */
        mov %rdx,48(%rdi)
        mov (%rsp),%rdx         /* save return addr ptr for new rip */
        mov %rdx,56(%rdi)
        xor %rax,%rax           /* always return 0 */
        ret