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[2620:137:e000::3:2]) by mx.google.com with ESMTPS id n13-20020a635c4d000000b005898699b2afsi1295944pgm.176.2023.10.11.20.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Oct 2023 20:56:36 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) client-ip=2620:137:e000::3:2; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=Bt1cO1HK; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by agentk.vger.email (Postfix) with ESMTP id 6A4C280842D3; Wed, 11 Oct 2023 20:55:21 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at agentk.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377431AbjJLDyx (ORCPT + 18 others); Wed, 11 Oct 2023 23:54:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59670 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377514AbjJLDxm (ORCPT ); Wed, 11 Oct 2023 23:53:42 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F97A10E3; Wed, 11 Oct 2023 20:51:57 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id d9443c01a7336-1c88b467ef8so4754815ad.0; Wed, 11 Oct 2023 20:51:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1697082715; x=1697687515; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:from:to:cc:subject:date :message-id:reply-to; bh=IpeT682jXo8zHQtou6ZhNNKzbowV2y0VimL5UVLWBn8=; b=Bt1cO1HK3G6coroGMGSCNYFwRd4qnfdCkfYk8pVezNvlkWhh0NHgFq/+qFLKFSa/q2 otz+wwWidkFSHfUj4CUGzJJMXvh/mWy+NZKDI+gzld25vKdKhZ2TkOsjqZljYl4qOo/v l7jwqmFbLweTcEgZ5Yxw3g7+PwFBY+ukFg9xO4dKAT2reVP4X1HKKb1g7/BqLpGqFM49 7NXcN1k2si/iuL2IrUwrb/1pmNEhUzTXFbu6XulCIA7j/NzByyvJbgmUi4IKUZL5PEnA z4zIiM1YzbZmlEE56cK7/4dAcjFeZ32IhbdBj+uvLanCTjAX8e7a16u5kkouhQv/+C9c 5Jzg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697082715; x=1697687515; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=IpeT682jXo8zHQtou6ZhNNKzbowV2y0VimL5UVLWBn8=; b=Q6O3eVVPCyN3IehfXfvgMz+RORUSJWBnZ0oJbLwn04L1Tj1jahV5sjhrZZmSehUqv7 lRnko1M3aXjI1yDqBn+sJ9+Yw9lAA56cD7ocXwGPiEm1Q97nBJdrWYPD/Dl/2kY3A8vA o+EBAk3izt/HDGGEGQg9phPt8SZKHMqcfkSoAmXF30R4kizGY/p6e5v8IjiyEe7SBRP4 vwmukVyO5GQU/E9mU9GDuvs4wvY4xLyp5PADQTvD2tgjOu9g7B6qjcVe3qx0BnEJvX0J ndpfzDc1VNEQNer7z2bkBmkKyJPD8GfWfRAszcQO/YoFJqQ6F+10uKXx+GugJ3JNvMmy Ys5Q== X-Gm-Message-State: AOJu0YzEYa1s3i6IfzTWhfPwjgiv6A4gw75Dh0h2JBd5SqxgkyFK7kLa OdNP++AaczFVylFhM/ptinhmf3dhGoo= X-Received: by 2002:a17:902:c947:b0:1c7:4a8a:32d1 with SMTP id i7-20020a170902c94700b001c74a8a32d1mr24944285pla.28.1697082715545; Wed, 11 Oct 2023 20:51:55 -0700 (PDT) Received: from bangji.hsd1.ca.comcast.net ([2601:647:6780:42e0:b1b9:d490:2f5e:be06]) by smtp.gmail.com with ESMTPSA id w8-20020a170902d70800b001bc18e579aesm711374ply.101.2023.10.11.20.51.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Oct 2023 20:51:55 -0700 (PDT) Sender: Namhyung Kim From: Namhyung Kim To: Arnaldo Carvalho de Melo , Jiri Olsa , Peter Zijlstra Cc: Ian Rogers , Adrian Hunter , Ingo Molnar , LKML , linux-perf-users@vger.kernel.org, Linus Torvalds , Stephane Eranian , Masami Hiramatsu , linux-toolchains@vger.kernel.org, linux-trace-devel@vger.kernel.org Subject: [PATCH 31/48] perf dwarf-aux: Add die_get_cfa() Date: Wed, 11 Oct 2023 20:50:54 -0700 Message-ID: <20231012035111.676789-32-namhyung@kernel.org> X-Mailer: git-send-email 2.42.0.655.g421f12c284-goog In-Reply-To: <20231012035111.676789-1-namhyung@kernel.org> References: <20231012035111.676789-1-namhyung@kernel.org> MIME-Version: 1.0 X-Spam-Status: No, score=-1.0 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Wed, 11 Oct 2023 20:55:21 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779520499901660011 X-GMAIL-MSGID: 1779520499901660011 The die_get_cfa() is to get frame base register and offset at the given instruction address (pc). This info will be used to locate stack variables which have location expression using DW_OP_fbreg. Signed-off-by: Namhyung Kim --- tools/perf/util/dwarf-aux.c | 64 +++++++++++++++++++++++++++++++++++++ tools/perf/util/dwarf-aux.h | 9 ++++++ 2 files changed, 73 insertions(+) diff --git a/tools/perf/util/dwarf-aux.c b/tools/perf/util/dwarf-aux.c index 97d9ae56350e..796413eb4e8f 100644 --- a/tools/perf/util/dwarf-aux.c +++ b/tools/perf/util/dwarf-aux.c @@ -1408,6 +1408,70 @@ Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr pc, return result; } +static int reg_from_dwarf_op(Dwarf_Op *op) +{ + switch (op->atom) { + case DW_OP_reg0 ... DW_OP_reg31: + return op->atom - DW_OP_reg0; + case DW_OP_breg0 ... DW_OP_breg31: + return op->atom - DW_OP_breg0; + case DW_OP_regx: + case DW_OP_bregx: + return op->number; + default: + break; + } + return -1; +} + +static int offset_from_dwarf_op(Dwarf_Op *op) +{ + switch (op->atom) { + case DW_OP_reg0 ... DW_OP_reg31: + case DW_OP_regx: + return 0; + case DW_OP_breg0 ... DW_OP_breg31: + return op->number; + case DW_OP_bregx: + return op->number2; + default: + break; + } + return -1; +} + +/** + * die_get_cfa - Get frame base information + * @dwarf: a Dwarf info + * @pc: program address + * @preg: pointer for saved register + * @poffset: pointer for saved offset + * + * This function gets register and offset for CFA (Canonical Frame Address) + * by searching the CIE/FDE info. The CFA usually points to the start address + * of the current stack frame and local variables can be located using an offset + * from the CFA. The @preg and @poffset will be updated if it returns 0. + */ +int die_get_cfa(Dwarf *dwarf, u64 pc, int *preg, int *poffset) +{ + Dwarf_CFI *cfi; + Dwarf_Frame *frame = NULL; + Dwarf_Op *ops = NULL; + size_t nops; + + cfi = dwarf_getcfi(dwarf); + if (cfi == NULL) + return -1; + + if (!dwarf_cfi_addrframe(cfi, pc, &frame) && + !dwarf_frame_cfa(frame, &ops, &nops) && nops == 1) { + *preg = reg_from_dwarf_op(ops); + *poffset = offset_from_dwarf_op(ops); + return 0; + } + return -1; +} + #endif /* diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h index 742098e3ee7e..29a7243b1a45 100644 --- a/tools/perf/util/dwarf-aux.h +++ b/tools/perf/util/dwarf-aux.h @@ -149,6 +149,9 @@ Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr pc, Dwarf_Addr addr, Dwarf_Die *die_mem, int *offset); +/* Get the frame base information from CFA */ +int die_get_cfa(Dwarf *dwarf, u64 pc, int *preg, int *poffset); + #else /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ static inline int die_get_var_range(Dwarf_Die *sp_die __maybe_unused, @@ -175,6 +178,12 @@ static inline Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die __maybe_unu return NULL; } +static inline int die_get_cfa(Dwarf *dwarf __maybe_unused, u64 pc __maybe_unused, + int *preg __maybe_unused, int *poffset __maybe_unused) +{ + return -1; +} + #endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ #endif /* _DWARF_AUX_H */