x86 breakpoint regression fix
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From: Frederic Weisbecker on 30 Jun 2010 10:20 On Wed, Jun 30, 2010 at 04:02:39PM +0200, Frederic Weisbecker wrote: > Ingo, > > Please pull the perf/urgent branch that can be found at: > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git > perf/urgent Please actually pull my perf/urgent-2 branch, it has the appropriate Tested-by tag. Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Maciej W. Rozycki on 30 Jun 2010 10:50 On Wed, 30 Jun 2010, Frederic Weisbecker wrote: > - icebp/int01 trap. This instruction (0xf1) is undocumented and > generates an int 1 exception. Unlike single step through TF > flag, it doesn't set the single step origin of the exception > in dr6. Not quite completely undocumented, but a bit obscure indeed. GDB calls this instruction ICEBP and some Intel sources -- INT1. It's been around for a while (at least since 80286) and is mostly used by in-circuit emulators (hence the name GDB uses). Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Ingo Molnar on 30 Jun 2010 14:50 * Frederic Weisbecker <fweisbec(a)gmail.com> wrote: > On Wed, Jun 30, 2010 at 04:02:39PM +0200, Frederic Weisbecker wrote: > > Ingo, > > > > Please pull the perf/urgent branch that can be found at: > > > > git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing.git > > perf/urgent > > > Please actually pull my perf/urgent-2 branch, it has the appropriate > Tested-by tag. Pulled, thanks Frederic! Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Frederic Weisbecker on 30 Jun 2010 15:10 On Wed, Jun 30, 2010 at 03:40:51PM +0100, Maciej W. Rozycki wrote: > On Wed, 30 Jun 2010, Frederic Weisbecker wrote: > > > - icebp/int01 trap. This instruction (0xf1) is undocumented and > > generates an int 1 exception. Unlike single step through TF > > flag, it doesn't set the single step origin of the exception > > in dr6. > > Not quite completely undocumented, but a bit obscure indeed. GDB calls > this instruction ICEBP and some Intel sources -- INT1. It's been around > for a while (at least since 80286) and is mostly used by in-circuit > emulators (hence the name GDB uses). Right, in fact it was quite easy to find any documentation about it, it's just officially undocumented. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Maciej W. Rozycki on 30 Jun 2010 18:30
On Wed, 30 Jun 2010, Frederic Weisbecker wrote: > Right, in fact it was quite easy to find any documentation about it, it's > just officially undocumented. I think it's simply not a part of the architecture. IOW they are free to remove it at any time, though most likely it will be kept forever. It's not like rocket science or whatever else to be kept hidden -- "everybody" knows this instruction (myself for at least 15 years). That's stuff like FFREEP, etc. ;) Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |