On 11 Sep 2008, at 20:36, Peter Popov wrote:
Peter
It should not be that hard. There are two main ABI's for PowerPC:
the sysv and the aix ABI. Linux/*BSD use the sysv ABI, and Mac OS,
Mac OS X and AIX uses the aix ABI. Hence, the aix abi is already
supported in the compiler. A libc-based rtl port based on the
solaris rtl shouldn't be that hard either.
Could you give me some pointers how to begin?
The wiki page pointed to by Felipe describes the compiler changes
fairly well. For the rtl: just copy the contents of rtl/solaris to rtl/
aix, and adapt the files (lookup constants and structure definitions
in the C header files and adapt the corresponding Pascal definitions).
Apart from rtl/solaris/termio*.*, I think you need everything to get a
basic rtl working.
You can avoid having to use assembler for the entry point code by
using the same trick that is used for Darwin. Have a look at rtl/bsd/
system.pp (search for FPC_DARWIN_JMP_MAIN, which is defined by current
compilers -- just copy that entire {$ifdef darwin} block to your own
system unit) and add your newly added system_powerpc64_aix identifier
to the set of OSes that use this functionality in compiler/ncgutil.pas
in the procedure gen_proc_symbol_end (in the if-test).
Jonas
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