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

[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.

Yuriy.