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(), i386 version
   6     Lang: english
   7 */
   8     #include "aros/i386/asm.h"
   9
  10     .text
  11     _ALIGNMENT
  12     .globl AROS_CDEFNAME(vfork)
  13     _FUNCTION(AROS_CDEFNAME(vfork))
  14     .set    bufsize, 8*4
  15     .set    stack,   7*4
  16
  17 AROS_CDEFNAME(vfork):
  18     lea     (-bufsize)(%esp), %esp /* _JMPLEN + 1 longs on the stack
  19                                       it's our temporary jmp_buf */
  20     push    %esp
  21     call    setjmp                 /* fill jmp_buf on the stack with
  22                                       current register values */
  23     pop     %esp
  24     mov     bufsize(%esp), %eax    /* set return address in jmp_buf */
  25     mov     %eax, retaddr(%esp)    /* to this function call return
  26                                       address */
  27     lea     bufsize(%esp), %eax    /* set stack value in jmp_buf */
  28                                    /* to stack value from before */
  29     mov     %eax, stack(%esp)      /* this function call */
  30
  31     mov     %esp, %eax
  32     push    %ebp
  33     mov     %esp, %ebp
  34     push    %eax
  35     call    __vfork                /* __vfork call won't return */