arch/.unmaintained/m68k-pp-native/exec/preparecontext.c

   1 /*
   2     Copyright © 1995-2011, The AROS Development Team. All rights reserved.
   3     $Id$
   4 */
   5
   6 #include <exec/execbase.h>
   7 #include <exec/tasks.h>
   8 #include <exec/memory.h>
   9 #include <exec/ptrace.h>
  10
  11 #include "exec_util.h"
  12
  13 BOOL PrepareContext(struct Task *task, APTR entryPoint, APTR fallBack,
  14                     struct TagItem *tagList, struct ExecBase *SysBase)
  15 {
  16     struct pt_regs *regs;
  17     UBYTE *sp = (UBYTE *)task->tc_SPReg;
  18
  19     /* Push fallBack address */
  20     sp -= sizeof(APTR);
  21     *(APTR *)sp = fallBack;
  22
  23     if (!(task->tc_Flags & TF_ETASK))
  24     {
  25         *(ULONG *)0x0bad0001=0;
  26         return FALSE;
  27     }
  28
  29     task->tc_UnionETask.tc_ETask->et_RegFrame = AllocTaskMem(task, SIZEOF_ALL_REGISTERS,
  30                                                              MEMF_PUBLIC|MEMF_CLEAR);
  31
  32     if (!(regs  = (struct pt_regs *)task->tc_UnionETask.tc_ETask->et_RegFrame))
  33     {
  34         *(ULONG *)0x0bad0003=0;
  35         return FALSE;
  36     }
  37
  38     regs->usp = sp;
  39     regs->pc  = (ULONG)entryPoint;
  40
  41     task->tc_SPReg = sp;
  42
  43     return TRUE;
  44 }