arch/x86_64-all/clib/vfork.s

   1 /*
   2     Copyright © 2008, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: POSIX function vfork()
   6     Lang: english
   7 */
   8
   9 /******************************************************************************
  10
  11     NAME
  12 #include <unistd.h>
  13
  14         pid_t vfork ();
  15
  16     FUNCTION
  17
  18     INPUTS
  19
  20     RESULT
  21
  22     NOTES
  23
  24     EXAMPLE
  25
  26     BUGS
  27
  28     SEE ALSO
  29
  30     INTERNALS
  31
  32     HISTORY
  33
  34 ******************************************************************************/
  35
  36     #include "aros/x86_64/asm.h"
  37
  38     .text
  39     _ALIGNMENT
  40     .globl AROS_CDEFNAME(vfork)
  41     _FUNCTION(AROS_CDEFNAME(vfork))
  42     .set    bufsize, 16*8
  43     .set    retaddr, 0*8
  44     .set    stack,   15*8
  45
  46 AROS_CDEFNAME(vfork):
  47     lea     (-bufsize)(%rsp), %rsp /* _JMPLEN + 1 longs on the stack
  48                                    it's our temporary jmp_buf */
  49     mov     %rsp, %rdi
  50     call    setjmp              /* fill jmp_buf on the stack with
  51                                    current register values */
  52     mov     bufsize(%rsp), %rax    /* set return address in jmp_buf */
  53     mov     %rax, 0(%rdi)       /* to this function call return
  54                                    address */
  55     lea     bufsize(%rsp), %rax    /* set stack value in jmp_buf */
  56     mov     %rax, 120(%rdi)     /* this function call */
  57     call    __vfork             /* __vfork call won't return */