From: Carlos O'Donell <carlos@baldric.uwo.ca>
To: John David Anglin <dave@hiauly1.hia.nrc.ca>
Cc: dave.anglin@nrc-cnrc.gc.ca, parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] Re: Found the r19 problem!
Date: Sun, 21 Sep 2003 15:16:53 -0400 [thread overview]
Message-ID: <20030921191653.GJ6963@systemhalted> (raw)
In-Reply-To: <200309211912.h8LJCd59011386@hiauly1.hia.nrc.ca>
On Sun, Sep 21, 2003 at 03:12:39PM -0400, John David Anglin wrote:
> Well that's why the restore is deleted. So, the clobber must go
> and r19 must be preserved across the asm(...). As I said, you can't
> clobber r19 when generating pic code. It's treated as fixed register,
> so clobbering it can lead to undefined behavior.
>
> If the syscall used r19, it could include a use of r19 in the asm.
> This would ensure the restore occurs before the syscall.
I'm going to stop writing r19 to the stack and tell gcc I'm using r4,
and then do a copy/copy to get r19 back.
c.
next prev parent reply other threads:[~2003-09-21 19:19 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-19 13:56 [parisc-linux] r19 (aka pic-register akak ltp) not restored on entry back to libc from libpthread? Carlos O'Donell
2003-09-19 16:56 ` John David Anglin
2003-09-19 17:51 ` Carlos O'Donell
2003-09-19 18:26 ` James Bottomley
2003-09-19 18:55 ` [parisc-linux] r19 (aka pic-register akak ltp) not restored on John David Anglin
2003-09-19 19:28 ` Carlos O'Donell
2003-09-19 20:10 ` John David Anglin
2003-09-21 15:45 ` [parisc-linux] Found the r19 problem! Carlos O'Donell
2003-09-21 16:39 ` [parisc-linux] " John David Anglin
2003-09-21 18:53 ` Carlos O'Donell
2003-09-21 18:55 ` Carlos O'Donell
2003-09-21 19:12 ` John David Anglin
2003-09-21 19:16 ` Carlos O'Donell [this message]
2003-09-21 19:18 ` John David Anglin
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