[fpc-pascal] Embedded ARM system unit
Florian Klaempfl
florian at freepascal.org
Wed Aug 24 10:00:04 CEST 2005
Marco van de Voort wrote:
>>I am in the first stage of creating a system unit for
>>Embedded ARM. Things are working but I get a lot of
>>Warnings and Hints (See some of them below).
>>Should I be worried about this?
>
>
> I see no troubling ones. THe first few mean that generic might not be 64-bit
> clean, but are probably false. (since generic.inc is used for the 64-bit ports too),
> the others are simply unused Unix symbols. This is normal, because these includefiles
> are also used in a few other places (like baseunix), where they _are_ used.
Maybe we should think about a generic embedded rtl which is configurable what's
included.
>
>
>>In the "fpc_InitializeUnits" procedure I have excluded the call
>>to the "fpc_cpuinit" procedure, my system cannot start if it is
>>included in the start up code. I cannot figure out the meaning
>>of this procedure. Dos anyone know what it is meant to do.
>
>
>>(*****************
>>procedure fpc_cpuinit;
>>begin
>> asm
>> rfs r0
>> and r0,r0,#0xffe0ffff
>> orr r0,r0,#0x00020000
>> wfs r0
>> end;
>>end;
>
>
> Probably modifications to the processor's exceptions registers. IOW, enable certain exceptions so
> that they can be trapped to Delphi language exceptions.
Enabling fpu exceptions.
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