From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968068AbcA1TvT (ORCPT ); Thu, 28 Jan 2016 14:51:19 -0500 Received: from mail-ob0-f193.google.com ([209.85.214.193]:35814 "EHLO mail-ob0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967696AbcA1TrI (ORCPT ); Thu, 28 Jan 2016 14:47:08 -0500 From: Jeffrey Merkey To: linux-kernel@vger.kernel.org Cc: linux@arm.linux.org.uk, linux.mdb@gmail.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH 17/31] Add debugger entry points for ARM Date: Thu, 28 Jan 2016 12:47:04 -0700 Message-Id: <1454010424-29097-1-git-send-email-jeffmerkey@gmail.com> X-Mailer: git-send-email 1.8.3.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- arch/arm/include/asm/kdebug.h | 5 +++++ 1 file changed, 5 insertions(+) create mode 100644 arch/arm/include/asm/kdebug.h diff --git a/arch/arm/include/asm/kdebug.h b/arch/arm/include/asm/kdebug.h new file mode 100644 index 0000000..c60dad1 --- /dev/null +++ b/arch/arm/include/asm/kdebug.h @@ -0,0 +1,5 @@ + +static inline void arch_breakpoint(void) +{ + asm(__inst_arm(0xe7ffdeff)); +} -- 1.8.3.1