arch/i386-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/i386/asm.h"
  37
  38     .text
  39     _ALIGNMENT
  40     .globl AROS_CDEFNAME(vfork)
  41     _FUNCTION(AROS_CDEFNAME(vfork))
  42     .set    bufsize, 8*4
  43     .set    retaddr, 0*4
  44     .set    stack,   7*4
  45
  46 AROS_CDEFNAME(vfork):
  47     lea     (-bufsize)(%esp), %esp /* _JMPLEN + 1 longs on the stack
  48                                       it's our temporary jmp_buf */
  49     push    %esp
  50     call    setjmp                 /* fill jmp_buf on the stack with
  51                                       current register values */
  52     pop     %esp
  53     mov     bufsize(%esp), %eax    /* set return address in jmp_buf */
  54     mov     %eax, retaddr(%esp)    /* to this function call return
  55                                       address */
  56     lea     bufsize(%esp), %eax    /* set stack value in jmp_buf */
  57                                    /* to stack value from before */
  58     mov     %eax, stack(%esp)      /* this function call */
  59
  60     mov     %esp, %eax
  61     push    %ebp
  62     mov     %esp, %ebp
  63     push    %eax
  64     call    __vfork                /* __vfork call won't return */