From: Jesse Allen <the3dfxdude@gmail.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Mike Hearn <mh@codeweavers.com>, Thomas Sailer <sailer@scs.ch>,
Eric Pouech <pouech-eric@wanadoo.fr>,
Daniel Jacobowitz <dan@debian.org>,
Roland McGrath <roland@redhat.com>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
wine-devel <wine-devel@winehq.com>
Subject: Re: ptrace single-stepping change breaks Wine
Date: Wed, 29 Dec 2004 14:43:00 -0700 [thread overview]
Message-ID: <530468570412291343d1478cf@mail.gmail.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0412291151080.2353@ppc970.osdl.org>
[-- Attachment #1: Type: text/plain, Size: 1125 bytes --]
On Wed, 29 Dec 2004 12:04:57 -0800 (PST), Linus Torvalds
<torvalds@osdl.org> wrote:
> On Wed, 29 Dec 2004, Jesse Allen wrote:
> > > So does removing the conditional TF clear make everything work again?
> > >
> >
> > Yes, as long as TIF_SINGLESTEP is not set in set_singlestep().
>
> That may be a clue, if only because that makes absolutely _zero_ sense.
>
> Setting TIF_SINGLESTEP shouldn't actually matter in this case, since we
> set the TRAP_FLAG in eflags by hand anyway (and that's what TIF_SINGESTEP
> will just re-do when returning to user space).
>
> What TIF_SINGLESTEP _does_ do, however, is change how some other issues
> are reported to user space. In particular, it causes system call tracing
> (see arch/i386/kernel/ptrace.c: do_syscall_trace), and maybe it is _that_
> that messes up Wine.
>
> So instead of removing the setting of TIF_SINGLESTEP in set_singlestep(),
> can you test whether removing the _testing_ of it in do_syscall_trace()
> makes things happier for you? Hmm?
>
Yes, doing that does work. But I still have to remove the conditional
TF clear. Here's the diff now to show you.
Jesse
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: reverse_thread_flag_test.diff --]
[-- Type: text/x-diff; name="reverse_thread_flag_test.diff", Size: 955 bytes --]
--- linux/arch/i386/kernel/ptrace.c 2004-12-29 14:10:34.000000000 -0700
+++ linux-mod/arch/i386/kernel/ptrace.c 2004-12-29 14:22:33.000000000 -0700
@@ -568,8 +568,7 @@
audit_syscall_exit(current, regs->eax);
}
- if (!test_thread_flag(TIF_SYSCALL_TRACE) &&
- !test_thread_flag(TIF_SINGLESTEP))
+ if (!test_thread_flag(TIF_SYSCALL_TRACE))
return;
if (!(current->ptrace & PT_PTRACED))
return;
--- linux/arch/i386/kernel/signal.c 2004-12-29 14:10:34.000000000 -0700
+++ linux-mod/arch/i386/kernel/signal.c 2004-12-29 14:23:04.000000000 -0700
@@ -299,8 +299,8 @@
* don't want debugging to change state.
*/
eflags = regs->eflags;
- if (current->ptrace & PT_DTRACE)
- eflags &= ~TF_MASK;
+// if (current->ptrace & PT_DTRACE)
+// eflags &= ~TF_MASK;
err |= __put_user(eflags, &sc->eflags);
err |= __put_user(regs->esp, &sc->esp_at_signal);
err |= __put_user(regs->xss, (unsigned int __user *)&sc->ss);
next prev parent reply other threads:[~2004-12-29 21:43 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.58.0411151439270.2222@ppc970.osdl.org>
2004-11-15 22:53 ` ptrace single-stepping change breaks Wine Roland McGrath
2004-11-19 19:00 ` Eric Pouech
2004-11-19 19:20 ` Linus Torvalds
2004-11-19 19:33 ` Eric Pouech
2004-11-19 19:51 ` Linus Torvalds
2004-11-19 20:41 ` Eric Pouech
2004-11-19 21:22 ` Linus Torvalds
2004-11-19 21:23 ` Daniel Jacobowitz
2004-11-19 21:53 ` Linus Torvalds
2004-11-20 21:49 ` Jesse Allen
2004-11-21 4:55 ` Jesse Allen
2004-11-21 21:32 ` Davide Libenzi
2004-11-21 22:33 ` Linus Torvalds
2004-11-21 23:14 ` Davide Libenzi
2004-11-22 1:12 ` Linus Torvalds
2004-11-22 0:13 ` Andreas Schwab
2004-11-22 1:07 ` Linus Torvalds
2004-11-22 4:06 ` Davide Libenzi
2004-11-22 4:29 ` Linus Torvalds
2004-11-22 6:23 ` Linus Torvalds
2004-11-22 11:06 ` Andreas Schwab
2004-11-22 16:27 ` Linus Torvalds
2004-11-22 13:46 ` Davide Libenzi
2004-11-22 23:15 ` Jesse Allen
2004-11-22 23:48 ` Jesse Allen
2004-11-28 17:01 ` Eric Pouech
2004-11-22 20:52 ` Eric Pouech
2004-11-22 21:10 ` Linus Torvalds
2004-11-22 22:19 ` Mike Hearn
2004-11-22 22:25 ` Linus Torvalds
2004-12-29 2:14 ` Thomas Sailer
2004-12-29 15:02 ` Mike Hearn
2004-12-29 18:53 ` Linus Torvalds
2004-12-29 19:40 ` Jesse Allen
2004-12-29 20:04 ` Linus Torvalds
2004-12-29 21:43 ` Jesse Allen [this message]
2004-12-30 0:44 ` Linus Torvalds
2004-12-30 1:13 ` Davide Libenzi
2004-12-30 1:55 ` Linus Torvalds
2004-12-30 4:51 ` Linus Torvalds
2004-12-30 4:58 ` Linus Torvalds
2004-12-30 5:07 ` Davide Libenzi
2004-12-30 7:26 ` Linus Torvalds
2004-12-30 17:59 ` Davide Libenzi
2004-12-30 18:16 ` Linus Torvalds
2004-12-30 19:27 ` Jesse Allen
2004-12-30 19:34 ` Linus Torvalds
2004-12-30 22:46 ` Linus Torvalds
2004-12-30 23:00 ` Daniel Jacobowitz
2004-12-30 23:17 ` Linus Torvalds
2004-12-31 5:36 ` Daniel Jacobowitz
2004-12-31 5:47 ` Linus Torvalds
2004-12-31 7:00 ` Jesse Allen
2004-12-31 15:10 ` Daniel Jacobowitz
2004-12-31 17:19 ` Linus Torvalds
2005-01-01 23:20 ` Daniel Jacobowitz
2005-01-29 9:25 ` Kari Hurtta
2004-12-30 23:15 ` Andi Kleen
2004-12-31 0:38 ` Linus Torvalds
2004-12-31 12:35 ` Andi Kleen
2004-12-31 15:16 ` Davide Libenzi
2004-12-31 17:30 ` Linus Torvalds
2004-12-31 19:55 ` Jesse Allen
2004-12-31 17:14 ` Linus Torvalds
2004-12-31 4:55 ` Jesse Allen
2004-12-31 5:05 ` Linus Torvalds
2004-12-31 5:38 ` Daniel Jacobowitz
2004-12-30 19:19 ` Davide Libenzi
2004-12-30 5:06 ` Davide Libenzi
2004-12-30 4:28 ` Jesse Allen
2004-12-29 20:56 ` Jesse Allen
2004-12-29 19:35 ` Thomas Sailer
2004-12-29 20:13 ` Jesse Allen
2004-12-30 1:49 ` Thomas Sailer
2004-12-30 2:10 ` Linus Torvalds
2004-12-30 2:39 ` Thomas Sailer
2004-12-30 2:57 ` Thomas Sailer
2004-12-30 3:15 ` Thomas Sailer
2004-12-30 4:15 ` Andrew Morton
2004-12-30 10:09 ` Thomas Sailer
2004-12-30 13:06 ` Mike Hearn
2004-12-31 13:13 ` Thomas Sailer
2004-12-31 13:31 ` Mike Hearn
2004-12-31 15:42 ` Jesse Allen
2004-12-31 15:56 ` Davide Libenzi
2004-12-31 15:59 ` Jesse Allen
2004-12-31 22:01 ` Linus Torvalds
2005-01-01 22:04 ` Davide Libenzi
2005-01-01 22:14 ` Linus Torvalds
2005-01-02 3:46 ` Davide Libenzi
2005-01-07 4:51 ` minor nit with decoding popf instruction - was " John Kacur
2005-01-07 6:48 ` Linus Torvalds
2005-01-08 5:05 ` John Kacur
2004-12-31 15:51 ` Thomas Sailer
[not found] ` <1104873315.3557.87.camel@littlegreen>
2005-01-04 21:21 ` Andrew Morton
2005-01-05 10:43 ` Thomas Sailer
2005-01-05 11:24 ` Ingo Molnar
2005-01-05 11:40 ` Alexandre Julliard
2004-12-30 12:11 ` Mike Hearn
2004-11-20 3:40 ` Roland McGrath
2004-11-19 20:59 ` Grzegorz Kulewski
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