Re: [9fans] plan9 vs aout

[Jens Staal <staal1978@gmail.com>]

I have now added 2 more branches for reference from the updated port of gcc and
binutils to i386-plan9 from https://marcus.biz.tm/jail/ :

binutils-2_22-plan9

gcc-4.8-plan9

Hopefully there are some clues there to help making a working current i386-plan9 cross
compiler.


On Tue, Jun 02, 2020 at 02:36:38PM +0200, Jens Staal wrote:
> Dear all,
> 
> First a bit of background:
> I am currently attempting to update the old i386-plan9 target for binutils/gcc
> in order to generate a modern cross compiler targeting plan9.
> 
> I have extracted the changes done to gcc 3.0 and binutils 2.11.2 from:
> https://9p.io/sources/extra/gcc/
> 
> My binutils and gcc attempts can be found at:
> 
> https://github.com/staalmannen/gcc
> branch plan9 : porting attempt to current gcc (10)
> branch gcc-3.0-plan9 : original port added to the 3.0 branch
> 
> https://github.com/staalmannen/binutils-gdb
> branch plan9: porting attempt to current binutils (2.34)
> branch binutils-2_11-plan9 : original port added to the 2.11 branch
> 
> Definitely not just a copy-and-paste endeavour unfortunately. The old port
> almost 20 years old and some style and structure changes have happened in that
> time.
> 
> I have built a binutils variant but when I try to compile a "Hello.S" with
> i386-lucent-plan9-as and execute it under i386 9front, I get an error about
> incorrect file header, so something is wrong.
> 
> What I learned from looking at the old port and trying to adapt it to compile in
> a modern binutils background is that a lot of it is basically copied from the
> generic aout target (I have some uncommitted changes where I am updating the
> obj-plan9 files to modern modified obj-aout files with the original changes
> applied).
> 
> So to my question: what are the differences between the plan9 file format and
> what binutils would see as generic aout? 
> 
> 
> PS. If someone would be interested to help out, you are more than welcome ;) DS.
> 
> 
> 
> 
> 
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