From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: 32-bit Thumb-2 breakpoints
Date: Wed, 3 Feb 2010 14:40:22 +0000 [thread overview]
Message-ID: <20100203144022.GG22275@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20100203135914.GF4277@wear.picochip.com>
On Wed, Feb 03, 2010 at 01:59:14PM +0000, Jamie Iles wrote:
> Well it looks like the hardware breakpoint layer is on top of the perf_events
> subsystem and the breakpoint becomes a perf event. In this case the breakpoint
> should be scheduled in and out by perf on context switches if targetting a
> specific PID or could be left in the whole time if desired.
Unfortunately, we're drifting from the original topic...
This starts worrying me more. Is execution stopped (as in actually
stopped, not just switched away from leaving the thread runnable) in
the target thread when one of these 'perf' breakpoints is hit? If
not, it's completely unsuitable for debuggers to use, and raises the
question of why it's being interfaced with the ptrace code.
Yes, x86 seems to use this method, but it doesn't send signals in the
counter overflow function, so things must be working differently there.
next prev parent reply other threads:[~2010-02-03 14:40 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-11 21:58 32-bit Thumb-2 breakpoints Daniel Jacobowitz
2010-01-11 22:35 ` Russell King - ARM Linux
2010-01-11 22:54 ` Daniel Jacobowitz
2010-01-11 23:10 ` Jamie Lokier
2010-01-11 23:15 ` Russell King - ARM Linux
2010-01-12 0:15 ` Jamie Lokier
2010-01-11 23:17 ` Daniel Jacobowitz
2010-01-12 0:17 ` Jamie Lokier
2010-01-12 0:22 ` Daniel Jacobowitz
2010-02-03 17:23 ` Jamie Lokier
2010-02-03 17:44 ` Daniel Jacobowitz
2010-02-04 22:46 ` Pavel Machek
2010-01-11 23:31 ` Russell King - ARM Linux
2010-01-11 23:51 ` Daniel Jacobowitz
2010-01-12 9:53 ` Catalin Marinas
2010-01-12 10:34 ` Catalin Marinas
2010-01-12 14:25 ` Daniel Jacobowitz
2010-01-28 20:21 ` Daniel Jacobowitz
2010-02-02 22:43 ` Russell King - ARM Linux
2010-02-03 0:50 ` Daniel Jacobowitz
2010-02-03 11:52 ` Catalin Marinas
2010-02-03 13:28 ` Russell King - ARM Linux
2010-02-03 13:48 ` Daniel Jacobowitz
2010-02-03 14:43 ` Russell King - ARM Linux
2010-02-03 14:56 ` Daniel Jacobowitz
2010-02-03 13:59 ` Jamie Iles
2010-02-03 14:40 ` Russell King - ARM Linux [this message]
2010-02-03 15:31 ` Jamie Iles
2010-02-03 16:01 ` Will Deacon
2010-02-03 15:02 ` Matthieu CASTET
2010-02-03 15:04 ` Catalin Marinas
2010-02-03 15:19 ` Nicolas Pitre
2010-02-03 15:19 ` Daniel Jacobowitz
2010-02-03 15:30 ` Russell King - ARM Linux
2010-02-03 15:35 ` Daniel Jacobowitz
2010-02-03 16:35 ` Russell King - ARM Linux
2010-02-03 17:45 ` Daniel Jacobowitz
2010-02-03 15:35 ` Nicolas Pitre
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