[patch 4/5] x86, ptrace: overflow signal API

[Markus Metzger <markus.t.metzger@intel.com>]

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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