From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <3e1162e60604220935x1c95f223sd295b1c6fdb772a0@mail.gmail.com>
Date: Sat, 22 Apr 2006 09:35:35 -0700
From: "David Leimbach" <leimy2k@gmail.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] OS X threads + dynamic linking
In-Reply-To: <0ad26600f43ce6f44c61e6f6d78ed116@swtch.com>
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	<0ad26600f43ce6f44c61e6f6d78ed116@swtch.com>
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On 4/21/06, Russ Cox <rsc@swtch.com> wrote:
> > Actually, this code violates the ABI.  The stack needs to be aligned
> > on a 16byte address.
> >
> > http://developer.apple.com/documentation/DeveloperTools/Conceptual/LowL=
evelABI/index.html
> >
> > So the assembly block should be:
> >
> >        asm(
> >                "pushal\n"
> >                "movl 8(%ebp), %ebx\n"
> >                "movl 12(%ebp), %eax\n"
> >                "xchgl %esp, %eax\n"
> >               "subl $0xc, %esp\n"  //need to align the stack... can't j=
ust pushl
> >                "pushl %eax\n"
> >                "call *%ebx\n"
> >                "popl %esp\n"
> >                "popal\n"
> >        );
> >
> > Just don't compile with -Os because gcc freaking inlines runonstack.
> > Whom to throttle for that one?
>
> The real version doesn't use inline assembly, so it's not a problem.
> I just wanted a single file demonstrating the problem.
>
> After aligning the stack pointer properly, the x86 OS X code
> now in CVS does appear to work.
>
> Thanks very much for tracking this down.
>

Hey no problem... I want to use it on my new system :)  Thanks for
"making it go".

> Russ
>
>