signals: demultiplexing SIGTRAP signal
Currently a SIGTRAP can denote any one of below reasons.
- Breakpoint hit
- H/W debug register hit
- Single step
- Signal sent through kill() or rasie()
Architectures like powerpc/parisc provides infrastructure to demultiplex
SIGTRAP signal by passing down the information for receiving SIGTRAP through
si_code of siginfot_t structure. Here is an attempt is generalise this
infrastructure by extending it to x86 and x86_64 archs.
Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: akpm@linux-foundation.org
Cc: paulus@samba.org
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index da5a596..0429c5d 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -891,6 +891,7 @@
{
struct task_struct *tsk = current;
unsigned int condition;
+ int si_code;
trace_hardirqs_fixup();
@@ -935,8 +936,9 @@
goto clear_TF_reenable;
}
+ si_code = get_si_code((unsigned long)condition);
/* Ok, finally something we can handle */
- send_sigtrap(tsk, regs, error_code);
+ send_sigtrap(tsk, regs, error_code, si_code);
/*
* Disable additional traps. They'll be re-enabled when