From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754124AbdBNObC (ORCPT ); Tue, 14 Feb 2017 09:31:02 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:53188 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754049AbdBNO3x (ORCPT ); Tue, 14 Feb 2017 09:29:53 -0500 From: Ravi Bangoria To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, mpe@ellerman.id.au Cc: benh@kernel.crashing.org, paulus@samba.org, lsorense@csclub.uwaterloo.ca, oohall@gmail.com, naveen.n.rao@linux.vnet.ibm.com, ast@kernel.org, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, anton@samba.org, paul.gortmaker@windriver.com, bauerman@linux.vnet.ibm.com, viro@zeniv.linux.org.uk, christophe.leroy@c-s.fr, duwe@lst.de, oss@buserror.net, Ravi Bangoria Subject: [PATCH v4 0/2] powerpc: Emulation support for load/store instructions on LE Date: Tue, 14 Feb 2017 19:58:06 +0530 X-Mailer: git-send-email 2.1.4 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17021414-0012-0000-0000-000002114CFB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17021414-0013-0000-0000-000006FD3D9B Message-Id: <1487082488-5624-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-02-14_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702140143 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org emulate_step is the basic infrastructure which is used by number of other kernel infrastructures like kprobe, hw-breakpoint(data breakpoint) etc. In case of kprobe, enabling emulation of load/store instructions will speedup the execution of probed instruction. In case of kernel-space breakpoint, causative instruction is first get emulated before executing user registered handler. If emulation fails, hw-breakpoint is disabled with error. As emulate_step does not support load/store instructions on LE, kernel-space hw-breakpoint infrastructure is broken on LE. emulate_step() uses a number of underlying kernel functions that were initially not enabled for LE. This has been rectified since. So, fix emulate_step() for LE for the corresponding instructions. Also add selftest which will run at boot if CONFIG_KPROBES_SANITY_TEST and CONFIG_PPC64 is set. Changes in v4: - Used late_initcall() for selftest - Makefile changes v3 link: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1332686.html Ravi Bangoria (2): powerpc: Emulation support for load/store instructions on LE powerpc: emulate_step tests for load/store instructions arch/powerpc/include/asm/ppc-opcode.h | 7 + arch/powerpc/lib/Makefile | 2 + arch/powerpc/lib/sstep.c | 20 -- arch/powerpc/lib/test_emulate_step.c | 443 ++++++++++++++++++++++++++++++++++ 4 files changed, 452 insertions(+), 20 deletions(-) create mode 100644 arch/powerpc/lib/test_emulate_step.c -- 1.8.3.1