From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967834AbcA1TuX (ORCPT ); Thu, 28 Jan 2016 14:50:23 -0500 Received: from mail-oi0-f67.google.com ([209.85.218.67]:36028 "EHLO mail-oi0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S967811AbcA1TrV (ORCPT ); Thu, 28 Jan 2016 14:47:21 -0500 From: Jeffrey Merkey To: linux-kernel@vger.kernel.org Cc: ralf@linux-mips.org, james.hogan@imgtec.com, linux.mdb@gmail.com, linux-mips@linux-mips.org Subject: [PATCH 21/31] Add debugger entry points for MIPS Date: Thu, 28 Jan 2016 12:47:17 -0700 Message-Id: <1454010437-29265-1-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/mips/include/asm/kdebug.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/mips/include/asm/kdebug.h b/arch/mips/include/asm/kdebug.h index 8e3d08e..af5999e 100644 --- a/arch/mips/include/asm/kdebug.h +++ b/arch/mips/include/asm/kdebug.h @@ -16,4 +16,16 @@ enum die_val { DIE_UPROBE_XOL, }; + +void arch_breakpoint(void) +{ + __asm__ __volatile__( + ".globl breakinst\n\t" + ".set\tnoreorder\n\t" + "nop\n" + "breakinst:\tbreak\n\t" + "nop\n\t" + ".set\treorder"); +} + #endif /* _ASM_MIPS_KDEBUG_H */ -- 1.8.3.1