linux-kernel - [44/70] ARM: 6864/1: hw_breakpoint: clear DBGVCR out of reset

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Message-Id: <20110419201047.857721020@clark.kroah.org>
Date:	Tue, 19 Apr 2011 13:08:53 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Will Deacon <will.deacon@....com>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [44/70] ARM: 6864/1: hw_breakpoint: clear DBGVCR out of reset

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Will Deacon <will.deacon@....com>

commit e89c0d7090c54d7b11b9b091e495a1ae345dd3ff upstream.

The DBGVCR, used for configuring vector catch debug events, is UNKNOWN
out of reset on ARMv7. When enabling monitor mode, this must be zeroed
to avoid UNPREDICTABLE behaviour.

This patch adds the zeroing code to the debug reset path.

Reported-by: Stepan Moskovchenko <stepanm@...eaurora.org>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/arm/kernel/hw_breakpoint.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -868,6 +868,13 @@ static void reset_ctrl_regs(void *info)
 		 */
 		asm volatile("mcr p14, 0, %0, c1, c0, 4" : : "r" (0));
 		isb();
+
+		/*
+		 * Clear any configured vector-catch events before
+		 * enabling monitor mode.
+		 */
+		asm volatile("mcr p14, 0, %0, c0, c7, 0" : : "r" (0));
+		isb();
 	}
 
 	if (enable_monitor_mode())


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