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Commit c6334593 authored by Markus Metzger's avatar Markus Metzger Committed by Ingo Molnar
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x86, ptrace: overflow signal API 



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: default avatarMarkus Metzger <markus.t.metzger@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent cba4b65d

include/asm-x86/ptrace-abi.h

+3 −1
Original line number Diff line number Diff line
@@ -88,11 +88,13 @@ struct ptrace_bts_config { 
	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 */