Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754017Ab3CKLDA (ORCPT ); Mon, 11 Mar 2013 07:03:00 -0400 Received: from mail.windriver.com ([147.11.1.11]:37746 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753988Ab3CKLC6 (ORCPT ); Mon, 11 Mar 2013 07:02:58 -0400 From: Tiejun Chen To: , CC: , , Subject: [v4][PATCH 3/7] book3e/kgdb: update thread's dbcr0 Date: Mon, 11 Mar 2013 19:02:42 +0800 Message-ID: <1362999766-20897-4-git-send-email-tiejun.chen@windriver.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1362999766-20897-1-git-send-email-tiejun.chen@windriver.com> References: <1362999766-20897-1-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 Content-Length: 1943 Lines: 54 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 5ca82cd..1a57307 100644 --- a/arch/powerpc/kernel/kgdb.c +++ b/arch/powerpc/kernel/kgdb.c @@ -410,7 +410,7 @@ 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]) { /* @@ -427,8 +427,15 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/