[fpc-devel] How can I distribute code in two different memory areas? (.section)

[Michael Ring]

pdecsub.pas looks like the place to look for, there I also found the 
declarations for the other keywords that work with procedures/functions. 
I am still not understanding enough of the inner workings of the 
compiler so if anybody feels the urge to implement this please go ahead 
;-) , for me this would be something for the longterm to try to do it 
myself, first I would like to get support for pic32mx done, this burns 
more under my fingernails and I am still not atb the end of the learning 
curve there.

Michael

Am 17.06.13 15:54, schrieb Pierre Free Pascal:
>    Maybe the section keyword that was introduced for embedded systems for variables
> (see compiler/pdecvar.pas unit, look for _SECTION and try_consume_sectiondirective)
> should be extended to function/procedure header parsing.
>
>
> procedure reset; assembler; nostackframe; public name'_reset'; section '.reset,"ax", at progbits';
> would then do all you want.
>
> Pierre Muller
>
>> -----Message d'origine-----
>> De : fpc-devel-bounces at lists.freepascal.org [mailto:fpc-devel-
>> bounces at lists.freepascal.org] De la part de Jeppe Græsdal Johansen
>> Envoyé : lundi 17 juin 2013 08:54
>> À : FPC developers' list
>> Objet : Re: [fpc-devel] How can I distribute code in two different memory
>> areas? (.section)
>>
>> Den 17-06-2013 08:20, Sergei Gorelkin skrev:
>>> 16.06.2013 23:39, Michael Ring пишет:
>>>> I had some time this weekend (while beeing grilled by the sun on my
>>>> balcony) to work on another
>>>> thing that did not work correct and that I did not understand (Now I
>>>> do, I least I hope ;-)
>>>>
>>>> As said before in this thread, I wanted to distribute Code in two
>>>> different memory areas because
>>>> this needs to be done so that pic32 startup code works correctly.
>>>>
>>>> But when I linked my binary the elf-file had always a startup address
>>>> somewhere in the wrong memory
>>>> area.
>>>>
>>>> This is what I tried:
>>>>
>>>> procedure reset; assembler; nostackframe; public name'_reset';
>>>> asm
>>>>     .section ".reset,\"ax\", at progbits"
>>>>     la      $k0, _startup
>>>>     jr      $k0                      //Jump to startup code
>>>>     nop
>>>>     .text
>>>> end;
>>>>
>>> In general, the custom section support in compiler needs a lot of
>>> improvement...
>>>
>>> Try the following, maybe it could work:
>>>
>>> procedure anyname; assembler; nostackframe;
>>> asm
>>>     .section ".reset,\"ax\", at progbits"
>>> .globl _reset
>>> _reset:                                   // <-- correct name here
>>>     la  $k0, _startup
>>>     jr  $k0
>>>     nop
>>> .text
>>> end;
>>>
>>>
>>> Regards,
>>> Sergei
>> I agree that it needs some work. Having a way to specify the section
>> with a procedure directive would largely be preferable I think. Such a
>> directive could also be interesting for variables and typed constants
>>
>> Also, I think
>>      .section ".reset"
>> should work just fine in most cases
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