arch/ppc-all/posixc/vfork.s

   1 /*
   2     Copyright © 2008-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: POSIX function vfork(), PowerPC version
   6     Lang: english
   7 */
   8
   9 #include "aros/ppc/asm.h"
  10
  11     .text
  12     _ALIGNMENT
  13     .globl AROS_CDEFNAME(vfork)
  14     _FUNCTION(AROS_CDEFNAME(vfork))
  15     .set    bufsize, 60*4
  16     .set    ret_addr, 2*4
  17     .set    stack,   0*4
  18
  19 AROS_CDEFNAME(vfork):
  20
  21     mtctr  1               /* save current stack pointer */
  22     stwu   1, -bufsize(1)  /* _JMPLEN + 2 longs on the stack
  23                               it's our temporary jmp_buf
  24                               aligned on 16 byte */
  25
  26     mflr  12               /* save return address */
  27
  28     addi  3, 1, 8          /* prepare argument for setjmp */
  29     lis   11, setjmp@ha    /* get address of setjmp */
  30     la    11, setjmp@l(11)
  31     mtlr  11
  32     blrl                   /* fill jmp_buf on the stack with
  33                               current register values */
  34
  35     stw   12, ret_addr+8(1) /* set return address in jmp_buf */
  36     mfctr 12
  37     stw   12, stack+8(1)   /* set stack value in jmp_buf */
  38
  39     addi  3, 1, 8          /* prepare argument for __vfork */
  40     lis   11, __vfork@ha   /* get address of __vfork */
  41     la    11, __vfork@l(11)
  42     mtctr 11
  43     bctr                   /* __vfork call won't return */