Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755017AbcKBIxU (ORCPT ); Wed, 2 Nov 2016 04:53:20 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:55485 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752760AbcKBIxR (ORCPT ); Wed, 2 Nov 2016 04:53:17 -0400 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, chris@distroguy.com, 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 0/3] powerpc: Emulation support for load/store instructions on LE Date: Wed, 2 Nov 2016 14:23:00 +0530 X-Mailer: git-send-email 2.5.5 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16110208-0052-0000-0000-000001E248AC X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16110208-0053-0000-0000-0000071CD942 Message-Id: <1478076783-2872-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-11-02_02:,, 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=8.0.1-1609300000 definitions=main-1611020165 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1721 Lines: 37 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 w.r.t. RFC: - Enable emulation support for all types of (Normal, Floating Point, Vector and Vector Scalar) load/store instructions. - Introduce selftest to test emulate_step for load/store instructions. Ravi Bangoria (3): powerpc: Emulation support for load/store instructions on LE powerpc: Add encoding for couple of load/store instructions powerpc: emulate_step test for load/store instructions arch/powerpc/include/asm/ppc-opcode.h | 7 + arch/powerpc/include/asm/sstep.h | 8 + arch/powerpc/kernel/kprobes.c | 2 + arch/powerpc/lib/Makefile | 4 + arch/powerpc/lib/sstep.c | 20 -- arch/powerpc/lib/test_emulate_step.c | 439 ++++++++++++++++++++++++++++++++++ 6 files changed, 460 insertions(+), 20 deletions(-) create mode 100644 arch/powerpc/lib/test_emulate_step.c -- 1.8.3.1