From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752555Ab3AUHpC (ORCPT ); Mon, 21 Jan 2013 02:45:02 -0500 Received: from mail.windriver.com ([147.11.1.11]:60907 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752332Ab3AUHoe (ORCPT ); Mon, 21 Jan 2013 02:44:34 -0500 From: Tiejun Chen To: , CC: , , Subject: [v2][PATCH 3/6] book3e/kgdb: update thread's dbcr0 Date: Mon, 21 Jan 2013 15:44:12 +0800 Message-ID: <1358754255-31484-4-git-send-email-tiejun.chen@windriver.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1358754255-31484-1-git-send-email-tiejun.chen@windriver.com> References: <1358754255-31484-1-git-send-email-tiejun.chen@windriver.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org gdb always need to generate a single step properly to invoke a kgdb state. But with lazy interrupt, book3e can't always trigger a debug exception with a single step since the current is blocked for handling those pending exception, then we miss that expected dbcr configuration at last to generate a debug exception. So here we also update thread's dbcr0 to make sure the current can go back with that missed dbcr0 configuration. Signed-off-by: Tiejun Chen --- arch/powerpc/kernel/kgdb.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/kgdb.c b/arch/powerpc/kernel/kgdb.c index 8747447..eb30a40 100644 --- a/arch/powerpc/kernel/kgdb.c +++ b/arch/powerpc/kernel/kgdb.c @@ -409,7 +409,7 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code, struct pt_regs *linux_regs) { char *ptr = &remcom_in_buffer[1]; - unsigned long addr; + unsigned long addr, dbcr0; switch (remcom_in_buffer[0]) { /* @@ -426,8 +426,15 @@ int kgdb_arch_handle_exception(int vector, int signo, int err_code, /* set the trace bit if we're stepping */ if (remcom_in_buffer[0] == 's') { #ifdef CONFIG_PPC_ADV_DEBUG_REGS - mtspr(SPRN_DBCR0, - mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); + dbcr0 = mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM; + mtspr(SPRN_DBCR0, dbcr0); +#ifdef CONFIG_PPC_BOOK3E_64 + /* With lazy interrut we have to update thread dbcr0 here + * to make sure we can set debug properly at last to invoke + * kgdb again to work well. + */ + current->thread.dbcr0 = dbcr0; +#endif linux_regs->msr |= MSR_DE; #else linux_regs->msr |= MSR_SE; -- 1.7.9.5