From c6334593c61c71ab2e666c015eef13995736f49a Mon Sep 17 00:00:00 2001 From: Markus Metzger Date: Wed, 30 Jan 2008 13:32:04 +0100 Subject: 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: Markus Metzger Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- include/asm-x86/ptrace-abi.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'include/asm-x86/ptrace-abi.h') diff --git a/include/asm-x86/ptrace-abi.h b/include/asm-x86/ptrace-abi.h index bcf67044754..b3b9e023afc 100644 --- a/include/asm-x86/ptrace-abi.h +++ b/include/asm-x86/ptrace-abi.h @@ -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 on buffer overflow instead of wrapping around */ #define PTRACE_BTS_O_CUT_SIZE 0x8 /* cut requested size to max available instead of failing */ -- cgit v1.2.3