[fpc-pascal] Best start point for adding new FPC target

[Florian Klämpfl]

Am 28.01.20 um 20:40 schrieb Yuriy Sydorov:
> On 28.01.2020 21:14, Fabio Luis Girardi via fpc-pascal wrote:
>> Em ter., 28 de jan. de 2020 às 16:04, Yuriy Sydorov <jura at cp-lab.com 
>> <mailto:jura at cp-lab.com>> escreveu:
>>
>>     You need to add support of a new CPU to the existing freebsd 
>> target. The target would be arm-freebsd, since armhf is
>>     not
>>     treated as a separate CPU by FPC. You need to create arm startup 
>> files in the rtl/freebsd/arm folder.
>>
>>
>> Yes, I know. But to add this new CPU support for the FPC/FreeBSD, it 
>> is better I start with files of rtl/freebsd/i386 or rtl/freebsd/x86_64 
>> or use another start point, like rtl/netbsd/arm ?
> 
> The primary goal of a startup code is to get pointers to the command 
> line parameters and the environment block. If arm-freebsd uses the stack 
> to pass these pointers (the same way as i386-freebsd), then you need 
> just to convert the i386 startup assembly to the arm assembly.
> For start you need only the prt0.as file.
> 

I strongly recommend to create pascal startup files for newly added targets.