Thanks Jonas.
I read Felipe's wiki thouroughly and i think I can manage that part. I
also see I have to use the Darwin (powerpc) rtl, not the linux (powerpc)
rtl. I will start experimenting with it on monday.
I have one question though, which is not clear to me, as I am not a
low-level system guy:
To get the whole thing started I have two options:
1. Generate cross-compiler capable of producing AIX compatible binaries
and start working on the rtl.
2. Generate a compiler for AIX and and start working on the rtl.
Option 1 seems the easier. I don't have mac powerpc machine, so I have to
work from linux. Your suggestion is to start with the darwin compiler,
right? As far as I looked, AIX uses XCOFF binaries. Can the mac powerpc
compiler generate compatible binaries? Is the FPC_DARWIN_JMP_MAIN
suggestion solution to this problem?
Option 2 seems complicated: I will have to first generate the compiler and
rtl object files for AIX. Next, link the compiler on AIX using AIX's
linker. Afterwards, work can begin on the rtl, which seems more complex?
Either way, I will have to first be able to generate aix compatible object
files before starting the actual compiler branch. Unless you advise
otherwise I will generate a linux-darwin cross and start experimenting
with option 1.
Peter
On Sat, 13 Sep 2008 03:24:42 -0500, Jonas Maebe
<[EMAIL PROTECTED]> wrote:
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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