arch/m68k-all/posixc/vfork_longjmp.s

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: longjmp for vfork(), m68k version
   6     Lang: english
   7
   8     The jmp_buf is filled as follows (d0/d1/a0/a1 are not saved):
   9
  10     _jmp_buf    offset  contents
  11     [0]         0       old pc
  12     [1]         4       d2
  13     [2]         8       d3
  14     [3]         12      d4
  15     [4]         16      d5
  16     [5]         20      d6
  17     [6]         24      d7
  18     [7]         28      a2
  19     [8]         32      a3
  20     [9]         36      a4
  21     [10]        40      a5
  22     [11]        44      a6
  23     [12]        48      old sp
  24     [13]        52      padding
  25     [14]        56      padding
  26     [15]        64      padding
  27 */
  28
  29 #include "aros/m68k/asm.h"
  30
  31         .text
  32         .balign 4
  33         .global AROS_CDEFNAME(vfork_longjmp)
  34         .type AROS_CDEFNAME(vfork_longjmp),%function
  35
  36 AROS_CDEFNAME(vfork_longjmp):
  37         /* New version adapted from libnix instead of ixemul.
  38          * Note the slightly different register save order.
  39          */
  40         addq.l  #4,%sp                     /* returns to other address */
  41         move.l  %sp@+,%a0                  /* get address of jmp_buf */
  42         move.l  %sp@+,%d0                  /* get return code */
  43 #if DEBUG
  44         cmp.l   #(DEBUG_MAGIC+1),%a0@(4 * 15)
  45         beq     0f
  46         trap    #1
  47 0:
  48 #endif
  49         movem.l (%a0),%d1-%d7/%a2-%a6/%sp  /* restore all registers except scratch */
  50         move.l  %d1,%a0                    /* set return address */
  51         jmp     %a0@
  52
  53