commit 41ab5266c3622354353433618edb92ab278025fa
author Ananth N Mavinakayanahalli <ananth@in.ibm.com> Thu Aug 23 21:27:09 2012 +0000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> Wed Sep 05 15:19:36 2012 +1000
tree 5e1313a104ae877a174a88a2c93eb010f1bd5861
parent 7118e7e648e0a902bf4f38c55a25fcff730f33d7

powerpc: Add trap_nr to thread_struct

Add thread_struct.trap_nr and use it to store the last exception
the thread experienced. In this patch, we populate the field at
various places where we force_sig_info() to the process.

This is also used in uprobes to determine if the probed instruction
caused an exception.

Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/mm/fault.c

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 08ffcf5..995f924 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -133,6 +133,7 @@
 	up_read(&current->mm->mmap_sem);
 
 	if (user_mode(regs)) {
+		current->thread.trap_nr = BUS_ADRERR;
 		info.si_signo = SIGBUS;
 		info.si_errno = 0;
 		info.si_code = BUS_ADRERR;