arch/x86_64-all/clib/vfork.s

   1 /*
   2     Copyright © 2008-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: POSIX function vfork()
   6     Lang: english
   7 */
   8
   9     #include "aros/x86_64/asm.h"
  10
  11     .text
  12     _ALIGNMENT
  13     .globl AROS_CDEFNAME(vfork)
  14     _FUNCTION(AROS_CDEFNAME(vfork))
  15     .set    bufsize, 16*8
  16     .set    stack,   15*8
  17
  18 AROS_CDEFNAME(vfork):
  19     lea     (-bufsize)(%rsp), %rsp /* _JMPLEN + 1 longs on the stack
  20                                    it's our temporary jmp_buf */
  21     mov     %rsp, %rdi
  22     call    setjmp              /* fill jmp_buf on the stack with
  23                                    current register values */
  24     mov     bufsize(%rsp), %rax    /* set return address in jmp_buf */
  25     mov     %rax, 0(%rdi)       /* to this function call return
  26                                    address */
  27     lea     bufsize(%rsp), %rax    /* set stack value in jmp_buf */
  28     mov     %rax, 120(%rdi)     /* this function call */
  29     call    __vfork             /* __vfork call won't return */