linux-kernel - [PATCH 28/31] Add debugger entry points for MN10300

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Message-Id: <1454010461-29567-1-git-send-email-jeffmerkey@gmail.com>
Date:	Thu, 28 Jan 2016 12:47:41 -0700
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	dhowells@...hat.com, yasutake.koichi@...panasonic.com,
	linux.mdb@...il.com, linux-am33-list@...hat.com
Subject: [PATCH 28/31] Add debugger entry points for MN10300

This patch series adds an export which can be set by system debuggers to
direct the hard lockup and soft lockup detector to trigger a breakpoint
exception and enter a debugger if one is active.  It is assumed that if
someone sets this variable, then an breakpoint handler of some sort will
be actively loaded or registered via the notify die handler chain.

This addition is extremely useful for debugging hard and soft lockups
real time and quickly from a console debugger.

Signed-off-by: Jeffrey Merkey <jeffmerkey@...il.com>
---
 arch/mn10300/include/asm/kdebug.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/mn10300/include/asm/kdebug.h b/arch/mn10300/include/asm/kdebug.h
index 0f47e11..307b8a1 100644
--- a/arch/mn10300/include/asm/kdebug.h
+++ b/arch/mn10300/include/asm/kdebug.h
@@ -19,4 +19,11 @@ enum die_val {
 	DIE_GPF,
 };

+static inline void arch_breakpoint(void)
+{
+	asm(".globl __arch_breakpoint; __arch_breakpoint: break");
+}
+extern u8 __arch_breakpoint;
+
+
 #endif /* _ASM_KDEBUG_H */
-- 
1.8.3.1