Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752867AbdLDJ5x (ORCPT ); Mon, 4 Dec 2017 04:57:53 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:52540 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752939AbdLDJ5I (ORCPT ); Mon, 4 Dec 2017 04:57:08 -0500 From: Hendrik Brueckner To: Arnaldo Carvalho de Melo , Alexei Starovoitov , Daniel Borkmann , Martin Schwidefsky , Will Deacon , Ingo Molnar Cc: Arnd Bergmann , Peter Zijlstra , "David S. Miller" , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH v2 6/6] perf s390: add regs_query_register_offset() Date: Mon, 4 Dec 2017 10:56:49 +0100 X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1512381409-19775-1-git-send-email-brueckner@linux.vnet.ibm.com> References: <1512381409-19775-1-git-send-email-brueckner@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17120409-0040-0000-0000-000003F6156A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17120409-0041-0000-0000-000025F90548 Message-Id: <1512381409-19775-7-git-send-email-brueckner@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-12-04_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1712040143 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3130 Lines: 95 The regs_query_register_offset() helper function converts register name like "%r0" to an offset of a register in user_pt_regs It is required by the BPF prologue generator. The user_pt_regs structure was recently added to "asm/ptrace.h". Hence, update tools/perf/check-headers.sh to keep the header file in sync with kernel changes. Suggested-by: Thomas Richter Signed-off-by: Hendrik Brueckner Reviewed-and-tested-by: Thomas Richter Acked-by: Alexei Starovoitov Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Heiko Carstens --- tools/perf/arch/s390/Makefile | 1 + tools/perf/arch/s390/util/dwarf-regs.c | 32 +++++++++++++++++++++++++++++--- tools/perf/check-headers.sh | 1 + 3 files changed, 31 insertions(+), 3 deletions(-) diff --git a/tools/perf/arch/s390/Makefile b/tools/perf/arch/s390/Makefile index 21322e0..09ba923 100644 --- a/tools/perf/arch/s390/Makefile +++ b/tools/perf/arch/s390/Makefile @@ -2,3 +2,4 @@ ifndef NO_DWARF PERF_HAVE_DWARF_REGS := 1 endif HAVE_KVM_STAT_SUPPORT := 1 +PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1 diff --git a/tools/perf/arch/s390/util/dwarf-regs.c b/tools/perf/arch/s390/util/dwarf-regs.c index f47576c..a8ace5c 100644 --- a/tools/perf/arch/s390/util/dwarf-regs.c +++ b/tools/perf/arch/s390/util/dwarf-regs.c @@ -2,17 +2,43 @@ /* * Mapping of DWARF debug register numbers into register names. * - * Copyright IBM Corp. 2010 - * Author(s): Heiko Carstens , + * Copyright IBM Corp. 2010, 2017 + * Author(s): Heiko Carstens , + * Hendrik Brueckner * */ +#include #include -#include +#include #include +#include +#include +#include #include "dwarf-regs-table.h" const char *get_arch_regstr(unsigned int n) { return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n]; } + +/* + * Convert the register name into an offset to struct pt_regs (kernel). + * This is required by the BPF prologue generator. The BPF + * program is called in the BPF overflow handler in the perf + * core. + */ +int regs_query_register_offset(const char *name) +{ + unsigned long gpr; + + if (!name || strncmp(name, "%r", 2)) + return -EINVAL; + + errno = 0; + gpr = strtoul(name + 2, NULL, 10); + if (errno || gpr >= 16) + return -EINVAL; + + return offsetof(user_pt_regs, gprs) + 8 * gpr; +} diff --git a/tools/perf/check-headers.sh b/tools/perf/check-headers.sh index 77406d2..6db9d80 100755 --- a/tools/perf/check-headers.sh +++ b/tools/perf/check-headers.sh @@ -30,6 +30,7 @@ arch/x86/include/uapi/asm/vmx.h arch/powerpc/include/uapi/asm/kvm.h arch/s390/include/uapi/asm/kvm.h arch/s390/include/uapi/asm/kvm_perf.h +arch/s390/include/uapi/asm/ptrace.h arch/s390/include/uapi/asm/sie.h arch/arm/include/uapi/asm/kvm.h arch/arm64/include/uapi/asm/kvm.h -- 1.8.3.1