setjmp.s

来自「Newlib 嵌入式 C库 标准实现代码」· S 代码 · 共 54 行

/*
 * ====================================================
 * Copyright (C) 2007 by Ellips BV. All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

 /*
 **  jmp_buf:
 **   rbx rbp r12 r13 r14 r15 rsp rip
 **   0   8   16  24  32  40  48  56
 */

  #include "x86_64mach.h"

  .global SYM (setjmp)
  .global SYM (longjmp)
  SOTYPE_FUNCTION(setjmp)
  SOTYPE_FUNCTION(longjmp)

SYM (setjmp):
  movq    rbx,  0 (rdi)
  movq    rbp,  8 (rdi)
  movq    r12, 16 (rdi)
  movq    r13, 24 (rdi)
  movq    r14, 32 (rdi)
  movq    r15, 40 (rdi)
  leaq    8 (rsp), rax
  movq    rax, 48 (rdi)
  movq    (rsp), rax
  movq    rax, 56 (rdi)
  movq    $0, rax
  ret

SYM (longjmp):
  movq    rsi, rax        /* Return value */

  movq     8 (rdi), rbp

  __CLI
  movq    48 (rdi), rsp
  pushq   56 (rdi)
  movq     0 (rdi), rbx
  movq    16 (rdi), r12
  movq    24 (rdi), r13
  movq    32 (rdi), r14
  movq    40 (rdi), r15
  __STI

  ret