freepascal.compiler/rtl/i386/setjump.inc

{
    $Id$
    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2000 by the Free Pascal development team

    SetJmp and LongJmp implementation for exception handling

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

    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.

 **********************************************************************}

{$ifdef needsigprocmask}
const
  JMPSIG_BLOCK   = 0;
  JMPSIG_SETMASK = 2;

function JmpSigProcMask(how:longint;nset : pjmpsigset;oset : pjmpsigset):longint; external name 'FPC_SYSC_SIGPROCMASK';

procedure savesigmask(var s:jmp_buf);
begin
  jmpsigprocmask(JMPSIG_BLOCK,nil,@s.sigmask);
end;

procedure restoresigmask(var s:jmp_buf);
begin
  jmpsigprocmask(JMPSIG_SETMASK,@s.sigmask,nil);
end;
{$endif needsigprocmask}

Function SetJmp (Var S : Jmp_buf) : longint;assembler;[Public, alias : 'FPC_SETJMP'];
asm
{$ifndef REGCALL}
  movl 8(%ebp),%eax
{$endif}
  movl %ebx,(%eax)
  movl %esi,4(%eax)
  movl %edi,8(%eax)
  movl 4(%ebp),%edi
  movl %edi,20(%eax)
  movl (%ebp),%edi
  movl %edi,12(%eax)
{$ifdef REGCALL}
  leal 8(%ebp),%edi
{$else}
  leal 12(%ebp),%edi
{$endif}
  movl %edi,16(%eax)
  movl 8(%eax),%edi
{$ifdef needsigprocmask}
  call savesigmask
{$endif needsigprocmask}  
  xorl %eax,%eax
end['EAX'];


Procedure longJmp (Var S : Jmp_buf; value : longint); assembler;[Public, alias : 'FPC_LONGJMP'];
asm
{$ifdef REGCALL}
{$ifdef needsigprocmask}
  movl %edx, %ebx
  movl %eax, %esi
  call restoresigmask
  movl %ebx, %edx
  movl %esi, %eax
{$endif needsigprocmask}
  xchgl %edx,%eax
{$else}
  movl 8(%ebp),%edx
  movl 12(%ebp),%eax
{$endif}

  movl (%edx),%ebx
  movl 4(%edx),%esi
  movl 8(%edx),%edi
  movl 12(%edx),%ebp
  movl 16(%edx),%esp
  // we should also clear the fpu
  // fninit no must be done elsewhere PM
  // or we should reset the control word also
  jmp 20(%edx)
end;

{
  $Log$
  Revision 1.6  2005-01-20 16:38:28  peter
    * restore sigprocmask for linux

  Revision 1.5  2003/12/04 21:42:07  peter
    * register calling updates

  Revision 1.4  2003/11/11 21:08:17  peter
    * REGCALL define added

  Revision 1.3  2002/09/07 16:01:19  peter
    * old logs removed and tabs fixed

}