From: Markus Metzger Date: Wed, 30 Jan 2008 12:32:04 +0000 (+0100) Subject: x86, ptrace: overflow signal API X-Git-Tag: v2.6.25-rc1~1143^2~481 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c6334593c61c71ab2e666c015eef13995736f49a;p=linux-2.6 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 --- diff --git a/include/asm-x86/ptrace-abi.h b/include/asm-x86/ptrace-abi.h index bcf6704475..b3b9e023af 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 */