From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753109AbdBCLG3 (ORCPT ); Fri, 3 Feb 2017 06:06:29 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:61586 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752238AbdBCLG0 (ORCPT ); Fri, 3 Feb 2017 06:06:26 -0500 From: He Kuang To: , , , , , , , CC: , , , Subject: [PATCH v2 2/3] perf tools: Enable bpf prologue for arm64 Date: Fri, 3 Feb 2017 11:06:06 +0000 Message-ID: <20170203110607.97529-2-hekuang@huawei.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20170203110607.97529-1-hekuang@huawei.com> References: <20170203110607.97529-1-hekuang@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.107.193.250] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090201.5894642D.0055,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 8e7200934058f0332c8c1f1dcd4a3e78 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since HAVE_KPROBES can be enabled in arm64, this patch introduces regs_query_register_offset() to convert register name to offset for arm64, so the BPF prologue feature is ready to use. Acked-by: Masami Hiramatsu Signed-off-by: He Kuang --- tools/perf/arch/arm64/Makefile | 1 + tools/perf/arch/arm64/util/dwarf-regs.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/tools/perf/arch/arm64/Makefile b/tools/perf/arch/arm64/Makefile index 18b1351..eebe1ec 100644 --- a/tools/perf/arch/arm64/Makefile +++ b/tools/perf/arch/arm64/Makefile @@ -2,3 +2,4 @@ ifndef NO_DWARF PERF_HAVE_DWARF_REGS := 1 endif PERF_HAVE_JITDUMP := 1 +PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1 diff --git a/tools/perf/arch/arm64/util/dwarf-regs.c b/tools/perf/arch/arm64/util/dwarf-regs.c index 090f36b..6d17a31 100644 --- a/tools/perf/arch/arm64/util/dwarf-regs.c +++ b/tools/perf/arch/arm64/util/dwarf-regs.c @@ -9,6 +9,8 @@ */ #include +#include /* for EINVAL */ +#include /* for strcmp */ #include /* for struct user_pt_regs */ #include @@ -75,3 +77,21 @@ const char *get_arch_regstr(unsigned int n) { return (n < ARCH_MAX_REGS) ? regoffset_table[n].name : NULL; } + +/* Reuse code from arch/arm64/kernel/ptrace.c */ +/** + * regs_query_register_offset() - query register offset from its name + * @name: the name of a register + * + * regs_query_register_offset() returns the offset of a register in struct + * user_pt_regs from its name. If the name is invalid, this returns -EINVAL; + */ +int regs_query_register_offset(const char *name) +{ + const struct pt_regs_offset *roff; + + for (roff = regoffset_table; roff->name != NULL; roff++) + if (!strcmp(roff->name, name)) + return roff->offset; + return -EINVAL; +} -- 1.8.5.2