From: "Russ Cox" <rsc@swtch.com>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] OS X threads + dynamic linking
Date: Fri, 21 Apr 2006 20:54:04 -0500 [thread overview]
Message-ID: <0ad26600f43ce6f44c61e6f6d78ed116@swtch.com> (raw)
In-Reply-To: <3e1162e60604210924h2a12fd99n171afc7893b5e646@mail.gmail.com>
> Actually, this code violates the ABI. The stack needs to be aligned
> on a 16byte address.
>
> http://developer.apple.com/documentation/DeveloperTools/Conceptual/LowLevelABI/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 just 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.
Russ
next prev parent reply other threads:[~2006-04-22 1:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-21 5:43 Russ Cox
2006-04-21 5:05 ` quanstro
2006-04-21 6:21 ` Russ Cox
2006-04-21 6:24 ` Don Bailey
2006-04-21 7:37 ` Russ Cox
2006-04-21 7:00 ` Don Bailey
2006-04-21 7:55 ` David Leimbach
2006-04-21 16:24 ` David Leimbach
2006-04-21 19:05 ` "Nils O. Selåsdal"
2006-04-22 1:54 ` Russ Cox [this message]
2006-04-22 16:35 ` David Leimbach
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