From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CBC1AC433DB for ; Tue, 23 Feb 2021 14:37:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A44B964E62 for ; Tue, 23 Feb 2021 14:37:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233081AbhBWOhF (ORCPT ); Tue, 23 Feb 2021 09:37:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233087AbhBWOgV (ORCPT ); Tue, 23 Feb 2021 09:36:21 -0500 Received: from mail-wr1-x44a.google.com (mail-wr1-x44a.google.com [IPv6:2a00:1450:4864:20::44a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BBECC06121F for ; Tue, 23 Feb 2021 06:34:56 -0800 (PST) Received: by mail-wr1-x44a.google.com with SMTP id k5so2379518wrw.14 for ; Tue, 23 Feb 2021 06:34:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=S0g1Gw0V8LQdKC7HpmWoNe9UXx0KjO/uwYjAYtfhLeU=; b=Fq2+eMK4jh0j/XFxErxBk8JeSfqqp/fu80bJNatnXBZ+At9fWTw+fV8REB7eXUtZp1 ULO0nXNMb/4yD7npazKim9wSN+KhAZDvelhEE2VXOW04dDQNWpR2j4a8dhjUh7H8vdLk LdBD159jN26zXBuVa/9kmkk6hXeouARhByuMWxXgSfSal5Vajn6E0H/0xXc9M/FBGqDx 71vEf/3qA2dcUZrsFdOJHXvfq/XGKNsVTheqxZJWbPoc0xiNH+vHxYQlKO6MY+NL0rTl U3Nazu+wdymC8xNyetJQHEzeaV/tg2wAU6FrWnoRr/J1/2/lOOZoEwX79LN/hewvBfCb vklg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=S0g1Gw0V8LQdKC7HpmWoNe9UXx0KjO/uwYjAYtfhLeU=; b=R9A7uNN2UIuJgV0+lybZIY3B+yw0Lsm23RWxv4LWr2A+BHyFdTzQGrb5aDK1qwWUBK KXL6BPUHu245Y1OUHLNd5+BVtYTh37Rz+5+4ZQxR3uqTyM8LZu0H56mTVRtB9DPtFA39 stLaDI4vruR9uz89f/3AW88Mz3CEVmHdK81dFbSIL/k7gTsXWm/4vZMMvXj7YaTVSht0 4zaKWc4UVwU8AwejDN6cuObXEFzQk0PzRBWXk8k4h7Y6dfF6JX0VahZY+xksEYs2UCuw C7OZDmFTiCTXegNr+3MsFRwuFxaIsBz8xOwTBNJj+IK4McqKxhvropqvnS988Mj6v7wh f3WQ== X-Gm-Message-State: AOAM530pJtSQ5HUbWi0ibiRCFuT8Gwzp2vdZ1bC5lal0WaW7mkUGvDJn SP5KKOGFW1flRyaF3BnJpuD/R5U3Qw== X-Google-Smtp-Source: ABdhPJzt6spWgjRPJkBK/IplFxSdnMgcPPQTnbG7I8X4jppm6p3wuv5JFcbCjpxvdDcCW9kqNB9SgjiX0A== Sender: "elver via sendgmr" X-Received: from elver.muc.corp.google.com ([2a00:79e0:15:13:855b:f924:6e71:3d5d]) (user=elver job=sendgmr) by 2002:a1c:2e90:: with SMTP id u138mr587498wmu.0.1614090894574; Tue, 23 Feb 2021 06:34:54 -0800 (PST) Date: Tue, 23 Feb 2021 15:34:26 +0100 In-Reply-To: <20210223143426.2412737-1-elver@google.com> Message-Id: <20210223143426.2412737-5-elver@google.com> Mime-Version: 1.0 References: <20210223143426.2412737-1-elver@google.com> X-Mailer: git-send-email 2.30.0.617.g56c4b15f3c-goog Subject: [PATCH RFC 4/4] perf/core: Add breakpoint information to siginfo on SIGTRAP From: Marco Elver To: elver@google.com, peterz@infradead.org, alexander.shishkin@linux.intel.com, acme@kernel.org, mingo@redhat.com, jolsa@redhat.com, mark.rutland@arm.com, namhyung@kernel.org, tglx@linutronix.de Cc: glider@google.com, viro@zeniv.linux.org.uk, arnd@arndb.de, christian@brauner.io, dvyukov@google.com, jannh@google.com, axboe@kernel.dk, mascasa@google.com, pcc@google.com, irogers@google.com, kasan-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Encode information from breakpoint attributes into siginfo_t, which helps disambiguate which breakpoint fired. Note, providing the event fd may be unreliable, since the event may have been modified (via PERF_EVENT_IOC_MODIFY_ATTRIBUTES) between the event triggering and the signal being delivered to user space. Signed-off-by: Marco Elver --- kernel/events/core.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/kernel/events/core.c b/kernel/events/core.c index 8718763045fd..d7908322d796 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6296,6 +6296,17 @@ static void perf_sigtrap(struct perf_event *event) info.si_signo = SIGTRAP; info.si_code = TRAP_PERF; info.si_errno = event->attr.type; + + switch (event->attr.type) { + case PERF_TYPE_BREAKPOINT: + info.si_addr = (void *)(unsigned long)event->attr.bp_addr; + info.si_perf = (event->attr.bp_len << 16) | (u64)event->attr.bp_type; + break; + default: + /* No additional info set. */ + break; + } + force_sig_info(&info); } -- 2.30.0.617.g56c4b15f3c-goog