Am Sonntag, den 17.02.2008, 20:46 +0100 schrieb Jonas Maebe:
> On 17 Feb 2008, at 20:43, Marc Santhoff wrote:
>
> > The code for FreeBSD in question looks like this:
> >
> > 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:=216; {Device not available}
> > FPE_FLTINV : Res:=216; {Invalid floating point
> > operation}
> > Else
> > Res:=208; {coprocessor error}
> > End;
> > sysResetFPU;
> > End;
> > SIGILL,
> > SIGBUS,
> > SIGSEGV :
> > res:=216;
> > end;
> >
> > What model of the i386 would be the best one for making a start?
>
> You shouldn't need any cpu/fpu flags info. grep -r /usr/include for
> FPE_INTDIV, and see if there isn't also a constant for a floating
> point division by zero in the same file.
Ah, now I understand. But I'm stuck at the error number for fpc, is
rtl/objpas/sysconsts.pp the authoritative source?
Mine from 2.0.4 looks like this:
<snip>
200 : Result:=SDivByZero;
201 : Result:=SRangeError;
203 : Result:=SOutOfMemory;
204 : Result:=SInvalidPointer;
205 : Result:=SOverFlow;
206 : Result:=SUnderFlow;
207 : Result:=SInvalidOp;
211 : Result:=SAbstractError;
214 : Result:=SBusError;
215 : Result:=SIntOverFlow;
216 : Result:=SAccessViolation;
</snip>
If I follow this scheme it'll be surely inconsistent afterwards and may
break existing code.
As you can see, the number 208 is not taken, yet.
Together with the list (and adapted comments reflecting those from the
FreeBSD source) the resulting code would be:
begin
Case Info.si_code Of
FPE_INTOVF : Res:=205; {integer overflow}
FPE_INTDIV : Res:=200; {integer divide by zero}
FPE_FLTDIV : Res:=200; {floating point divide by zero}
FPE_FLTOVF : Res:=205; {floating point overflow}
FPE_FLTUND : Res:=206; {floating point underflow}
FPE_FLTRES : Res:=???; {floating point inexact result}
FPE_FLTINV : Res:=???; {Invalid floating point operation}
FPE_FLTSUB : Res:=???; {subscript out of range}
Else
Res:=???; {coprocessor error}
End;
sysResetFPU;
End;
Note the ???'s there I do not know, which way to go.
Marc
_______________________________________________
fpc-pascal maillist - fpc-pascal@lists.freepascal.org
http://lists.freepascal.org/mailman/listinfo/fpc-pascal
