freepascal.compiler/rtl/darwin/powerpc/sighnd.inc

{  
   $Id$
   This file is part of the Free Pascal run time library.
   (c) 2000-2003 by Marco van de Voort
   member of the Free Pascal development team.

   See the file COPYING.FPC, included in this distribution,
   for details about the copyright.

   Signalhandler for FreeBSD/i386

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY;without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
}

procedure SignalToRunerror(Sig: cint; var info : tsiginfo_t;Var SigContext:SigContextRec); cdecl;

var
  res : word;

begin
  res:=0;
  case sig of
    SIGFPE :
      begin
        Case Info.si_code Of
          FPE_INTDIV : Res:=200;  {integer divide fault. Div0?}
          FPE_FLTOVF : Res:=205;  {Overflow trap}
          FPE_FLTUND : Res:=206;  {Stack over/underflow}
          FPE_FLTRES : Res:=208;  {Device not available}
          FPE_FLTINV : Res:=207;  {Invalid floating point operation}
          Else
              Res:=208; {coprocessor error}
        end;
        { FPU exceptions are completely disabled by the kernel if one occurred, it  }
        { seems this is necessary to be able to return to user mode. They can be    }
        { enabled by executing a sigreturn, however then the exception is triggered }
        { triggered again immediately if we don't turn off the "exception occurred" }
        { flags in fpscr                                                            }
        SigContext.uc_mcontext^.fs.fpscr := SigContext.uc_mcontext^.fs.fpscr and not($fffe0700);
      end;
    SIGILL,
    SIGBUS,
    SIGSEGV :
        res:=216;
  end;
  {$ifdef FPC_USE_SIGPROCMASK}
   reenable_signal(sig);
  {$endif }

  { return to trampoline }
  if res <> 0 then
    begin
      SigContext.uc_mcontext^.ss.r3 := res;
      SigContext.uc_mcontext^.ss.r4 := SigContext.uc_mcontext^.ss.srr0;
      SigContext.uc_mcontext^.ss.r5 := SigContext.uc_mcontext^.ss.r1;
      pointer(SigContext.uc_mcontext^.ss.srr0) := @HandleErrorAddrFrame;
    end;
end;

{
  $Log$
  Revision 1.3  2004-01-10 00:16:21  jonas
    * fixed mtfsb0 instruction for assembler reader/writer
    * fixed initialisation of fpscr register to avoid spurious SIGPFE's
      (uses mtfsb0 instruction, so added extra define in options.pas to avoid
      requiring to start with a cross compiler)

  Revision 1.2  2004/01/08 21:52:34  jonas
    * fixed signal handling under 10.3.2, still have to verify whether it's
      backwards compatible

  Revision 1.1  2004/01/04 20:05:38  jonas
    * first working version of the Darwin/Mac OS X (for PowerPC) RTL
      Several non-essential units are still missing, but make cycle works

  Revision 1.1  2004/01/03 12:29:36  marco
   * now separately.

}