linux-kernel - [S390] Fix kprobes breakpoint handling.

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Message-ID: <20070126165300.GS11609@skybase>
Date:	Fri, 26 Jan 2007 17:53:00 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Cc:	heiko.carstens@...ibm.com
Subject: [S390] Fix kprobes breakpoint handling.

From: Heiko Carstens <heiko.carstens@...ibm.com>

[S390] Fix kprobes breakpoint handling.

In case of an illegal op the die notifier gets called with DIE_TRAP
instead of DIE_BPT first.

Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---

 arch/s390/kernel/traps.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff -urpN linux-2.6/arch/s390/kernel/traps.c linux-2.6-patched/arch/s390/kernel/traps.c
--- linux-2.6/arch/s390/kernel/traps.c	2007-01-26 17:27:47.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/traps.c	2007-01-26 17:28:05.000000000 +0100
@@ -490,8 +490,15 @@ static void illegal_op(struct pt_regs * 
 #endif
 		} else
 			signal = SIGILL;
-	} else
-		signal = SIGILL;
+	} else {
+		/*
+		 * If we get an illegal op in kernel mode, send it through the
+		 * kprobes notifier. If kprobes doesn't pick it up, SIGILL
+		 */
+		if (notify_die(DIE_BPT, "bpt", regs, interruption_code,
+			       3, SIGTRAP) != NOTIFY_STOP)
+			signal = SIGILL;
+	}
 
 #ifdef CONFIG_MATHEMU
         if (signal == SIGFPE)
-
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