Messages in this thread Patch in this message | | | Date | Thu, 20 Dec 2007 14:40:12 +0100 | From | Markus Metzger <> | Subject | [patch 4/5] x86, ptrace: overflow signal API |
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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 */ --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.
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