Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933519Ab3CVPTH (ORCPT ); Fri, 22 Mar 2013 11:19:07 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:38650 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932792Ab3CVPTE (ORCPT ); Fri, 22 Mar 2013 11:19:04 -0400 Date: Fri, 22 Mar 2013 20:48:38 +0530 From: Ananth N Mavinakayanahalli To: lkml Cc: oleg@redhat.com, Srikar Dronamraju , benh@kernel.crashing.org, ppcdev Subject: [PATCH v2 3/4] uprobes/powerpc: teach uprobes to ignore gdb breakpoints Message-ID: <20130322151838.GD20010@in.ibm.com> Reply-To: ananth@in.ibm.com References: <20130322151627.GB20010@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130322151627.GB20010@in.ibm.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13032215-3620-0000-0000-000001BC2DD0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1408 Lines: 41 From: Ananth N Mavinakayanahalli Powerpc has many trap variants that could be used by entities like gdb. Currently, running gdb on a program being traced by uprobes causes an endless loop since uprobes doesn't understand that the trap was inserted by some other entity and a SIGTRAP needs to be delivered. Teach uprobes to ignore breakpoints that do not belong to it. Signed-off-by: Ananth N Mavinakayanahalli --- arch/powerpc/kernel/uprobes.c | 10 ++++++++++ 1 file changed, 10 insertions(+) Index: linux-3.9-rc3/arch/powerpc/kernel/uprobes.c =================================================================== --- linux-3.9-rc3.orig/arch/powerpc/kernel/uprobes.c +++ linux-3.9-rc3/arch/powerpc/kernel/uprobes.c @@ -31,6 +31,16 @@ #define UPROBE_TRAP_NR UINT_MAX /** + * is_trap_insn - check if the instruction is a trap variant + * @insn: instruction to be checked. + * Returns true if @insn is a trap variant. + */ +bool is_trap_insn(uprobe_opcode_t *insn) +{ + return (is_trap(*insn)); +} + +/** * arch_uprobe_analyze_insn * @mm: the probed address space. * @arch_uprobe: the probepoint information. -- 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/