From: Markus Metzger <markus.t.metzger@intel.com>
To: ak@suse.de, hpa@zytor.com, linux-kernel@vger.kernel.org,
mingo@elte.hu, tglx@linutronix.de
Cc: markus.t.metzger@intel.com, markus.t.metzger@gmail.com,
suresh.b.siddha@intel.com, roland@redhat.com,
akpm@linux-foundation.org, mtk.manpages@gmail.com
Subject: [patch 4/5] x86, ptrace: overflow signal API
Date: Thu, 20 Dec 2007 14:40:12 +0100 [thread overview]
Message-ID: <20071220144012.A29998@sedona.ch.intel.com> (raw)
Establish the user API for sending a user-defined signal to the traced task on a BTS buffer overflow.
This should complete the user API for the BTS ptrace extension.
The patches so far implement wrap-around overflow handling as is needed for debugging.
The remaining open is another overflow handling mechanism that sends a signal to the traced task on a buffer overflow.
This will take some more time from my side.
Since, from a user perspective, this occurs behind the scenes, the patch set should already be useful. More features may/will be added on top of it (overflow signal, pageable back-up buffers, kernel tracing, core file support, profiling, ...).
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---
Index: linux-2.6-x86/include/asm-x86/ptrace-abi.h
===================================================================
--- linux-2.6-x86.orig/include/asm-x86/ptrace-abi.h 2007-12-20 13:52:09.%N +0100
+++ linux-2.6-x86/include/asm-x86/ptrace-abi.h 2007-12-20 13:52:14.%N +0100
@@ -88,11 +88,13 @@
unsigned int size;
/* bitmask of below flags */
unsigned int flags;
+ /* buffer overflow signal */
+ unsigned int signal;
};
#define PTRACE_BTS_O_TRACE 0x1 /* branch trace */
#define PTRACE_BTS_O_SCHED 0x2 /* scheduling events w/ jiffies */
-#define PTRACE_BTS_O_SIGNAL 0x4 /* send SIG? on buffer overflow
+#define PTRACE_BTS_O_SIGNAL 0x4 /* send SIG<signal> on buffer overflow
instead of wrapping around */
#define PTRACE_BTS_O_CUT_SIZE 0x8 /* cut requested size to max available
instead of failing */
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reply other threads:[~2007-12-20 13:42 UTC|newest]
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