From patchwork Sat Jan 7 13:35:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guo Ren X-Patchwork-Id: 40402 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp1304251wrt; Sat, 7 Jan 2023 05:41:46 -0800 (PST) X-Google-Smtp-Source: AMrXdXsQjJplWRAxKTULj0XFEaeWonP2/aSS3NxoQsVv5CwIhHGR+FWOhvuixaCjAomtpS1KVyij X-Received: by 2002:a17:906:3993:b0:844:de87:8684 with SMTP id h19-20020a170906399300b00844de878684mr58232904eje.46.1673098906160; Sat, 07 Jan 2023 05:41:46 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673098906; cv=none; d=google.com; s=arc-20160816; b=OQkKoA8lM1K4wlDFlqUUSF2eeWVuBkPMXpQIO8/ms4fEza+cRj3gYhgGZlkesNfJw7 vgzWe5VPskAOdRGf6w+mOQjV+fD5oCnxgBRe1McW0gSISvSfI/sWvub2W+f8LkYjP/2d 12WLbv1gChMqjPoUtZbYu+Nixja1eIk0t6zDf+gEU1QNIl9nLG7qn0GE+bFIbQxjBIF2 F9usoX5tzf6qbPy9fZQtuaVLs/3kAJzSWs3xxIqP/5PC6Ce0Xn91KhNPzp4MCcchiIIH QzJvEBwQJH2oW2l93QYAg15BxTv3UnfaHIvUiQMkXZYh4v34s0u/5GmfozyA/vOvCdgE RrRQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=cgDhdGo27yPsyuHWWy3Ge/acXBw6QuDn8ZCXSAnWhtw=; b=V16tIQ6EyY0BExyBynifu+/pK42RUr8JjrbSpycG2pqmAXqnJ881aB8ZhQKqXSWO+W kP30CwNQ/BWCSN7HO/AwLA7czVQKDFmxynqj50m3qejnTXJdzDTnUOe1IiOKzhPtg8nO JHv+faug0AnLc4Pg+Jye8B7o2EaJAUokcSYBceVRM+Nu5Uxiz/KjPpJKvCiCAwnXtA86 CNLnXssX/bPwfsPOeWQMmlegyBrgHky+GeUEnw6VS5WJvD4yQYHhIuWdDmNL1wltYdFc aGV5OqlMKfU9WG8L6DGtVwOZ5w+HKvkPkltAji4jy41KttZroycv+VXrr51IJVTwvoFU z8Bg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=hVvP4lWF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 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 (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id di17-20020a170906731100b0084c8d880503si5071192ejc.76.2023.01.07.05.41.22; Sat, 07 Jan 2023 05:41:46 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=hVvP4lWF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232752AbjAGNg6 (ORCPT + 99 others); Sat, 7 Jan 2023 08:36:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230114AbjAGNgi (ORCPT ); Sat, 7 Jan 2023 08:36:38 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6613E5D403 for ; Sat, 7 Jan 2023 05:36:32 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 039CC60C11 for ; Sat, 7 Jan 2023 13:36:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78767C433F2; Sat, 7 Jan 2023 13:36:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673098591; bh=pmoRmYHUocgngJ056nJEhNojdxLJ5afNZhIWTJu7cp0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hVvP4lWF5CTks6yieP9WbQ31uiYRiUPBR6ZmrXapUQaitTx8yLpJwLgUVDsKZEVGF Q+GHmeFa5tZIDwt6W0vWvVpE2itEpMkSfCJ2CUQUYQ4KHHs818ou93pn6JJLUBDmCm zi5lPPxlxPn+h5q3AWaJFap0hSjJd1oxwv2J3dhYDG1SS1fN+/UsrJAmlFJ87yeSKI /Urkb8sY+Ml627V13iF5CNL7hZzCmf/B1jG5NHV6tPyNssRtrdmRKDK8CqjP2ed/43 2sr+OPKSkEPRuVysCEyhn3iVlb7X6epiQ+dKmnuuJcsX1YE9sXlR6Pe9t2Dda0MtPH pGLseuCyfqKQA== From: guoren@kernel.org To: anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, conor.dooley@microchip.com, heiko@sntech.de, rostedt@goodmis.org, mhiramat@kernel.org, jolsa@redhat.com, bp@suse.de, jpoimboe@kernel.org, suagrfillet@gmail.com, andy.chiu@sifive.com, e.shatokhin@yadro.com, guoren@kernel.org Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH -next V6 5/7] riscv: ftrace: Make ftrace_caller call ftrace_graph_func Date: Sat, 7 Jan 2023 08:35:47 -0500 Message-Id: <20230107133549.4192639-6-guoren@kernel.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20230107133549.4192639-1-guoren@kernel.org> References: <20230107133549.4192639-1-guoren@kernel.org> MIME-Version: 1.0 X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754371358775543876?= X-GMAIL-MSGID: =?utf-8?q?1754371358775543876?= From: Song Shuai In order to make the function graph use ftrace directly, ftrace_caller should be adjusted to save the necessary regs against the pt_regs layout so it can call ftrace_graph_func reasonably. SAVE_ALL now saves all the regs according to the pt_regs struct. Here supersedes SAVE_ALL by SAVE_ABI_REGS which has an extra option to allow saving only the necessary ABI-related regs for ftrace_caller. ftrace_caller and ftrace_regs_caller save their regs with the respective option of SAVE_ABI_REGS, then call the tracing function, especially graph_ops's ftrace_graph_func. So the ftrace_graph_[regs]_call labels aren't needed anymore if FTRACE_WITH_REGS is defined. As the previous patch described, the ftrace_caller remains with its ftrace_graph_call if FTRACE_WITH_REGS isn't defined, For convenience, the original argument setup for the tracing function in ftrace_[regs]_caller is separated as PREPARE_ARGS. Signed-off-by: Song Shuai Tested-by: Guo Ren Signed-off-by: Guo Ren --- arch/riscv/kernel/mcount-dyn.S | 142 ++++++++++++++++++++++++--------- 1 file changed, 104 insertions(+), 38 deletions(-) diff --git a/arch/riscv/kernel/mcount-dyn.S b/arch/riscv/kernel/mcount-dyn.S index b75332ced757..d7d4d51b4bd7 100644 --- a/arch/riscv/kernel/mcount-dyn.S +++ b/arch/riscv/kernel/mcount-dyn.S @@ -57,19 +57,52 @@ .endm #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS - .macro SAVE_ALL + +/** +* SAVE_ABI_REGS - save regs against the pt_regs struct +* +* @all: tell if saving all the regs +* +* If all is set, all the regs will be saved, otherwise only ABI +* related regs (a0-a7,epc,ra and optional s0) will be saved. +* +* After the stack is established, +* +* 0(sp) stores the PC of the traced function which can be accessed +* by &(fregs)->regs->epc in tracing function. Note that the real +* function entry address should be computed with -FENTRY_RA_OFFSET. +* +* 8(sp) stores the function return address (i.e. parent IP) that +* can be accessed by &(fregs)->regs->ra in tracing function. +* +* The other regs are saved at the respective localtion and accessed +* by the respective pt_regs member. +* +* Here is the layout of stack for your reference. +* +* PT_SIZE_ON_STACK -> +++++++++ +* + ..... + +* + t3-t6 + +* + s2-s11+ +* + a0-a7 + --++++-> ftrace_caller saved +* + s1 + + +* + s0 + --+ +* + t0-t2 + + +* + tp + + +* + gp + + +* + sp + + +* + ra + --+ // parent IP +* sp -> + epc + --+ // PC +* +++++++++ +**/ + .macro SAVE_ABI_REGS, all=0 addi sp, sp, -PT_SIZE_ON_STACK REG_S t0, PT_EPC(sp) REG_S x1, PT_RA(sp) - REG_S x2, PT_SP(sp) - REG_S x3, PT_GP(sp) - REG_S x4, PT_TP(sp) - REG_S x5, PT_T0(sp) - REG_S x6, PT_T1(sp) - REG_S x7, PT_T2(sp) - REG_S x8, PT_S0(sp) - REG_S x9, PT_S1(sp) + + // always save the ABI regs + REG_S x10, PT_A0(sp) REG_S x11, PT_A1(sp) REG_S x12, PT_A2(sp) @@ -78,6 +111,18 @@ REG_S x15, PT_A5(sp) REG_S x16, PT_A6(sp) REG_S x17, PT_A7(sp) + + // save the leftover regs + + .if \all == 1 + REG_S x2, PT_SP(sp) + REG_S x3, PT_GP(sp) + REG_S x4, PT_TP(sp) + REG_S x5, PT_T0(sp) + REG_S x6, PT_T1(sp) + REG_S x7, PT_T2(sp) + REG_S x8, PT_S0(sp) + REG_S x9, PT_S1(sp) REG_S x18, PT_S2(sp) REG_S x19, PT_S3(sp) REG_S x20, PT_S4(sp) @@ -92,19 +137,19 @@ REG_S x29, PT_T4(sp) REG_S x30, PT_T5(sp) REG_S x31, PT_T6(sp) + + // save s0 if FP_TEST defined + + .else +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST + REG_S x8, PT_S0(sp) +#endif + .endif .endm - .macro RESTORE_ALL + .macro RESTORE_ABI_REGS, all=0 REG_L t0, PT_EPC(sp) REG_L x1, PT_RA(sp) - REG_L x2, PT_SP(sp) - REG_L x3, PT_GP(sp) - REG_L x4, PT_TP(sp) - REG_L x5, PT_T0(sp) - REG_L x6, PT_T1(sp) - REG_L x7, PT_T2(sp) - REG_L x8, PT_S0(sp) - REG_L x9, PT_S1(sp) REG_L x10, PT_A0(sp) REG_L x11, PT_A1(sp) REG_L x12, PT_A2(sp) @@ -113,6 +158,16 @@ REG_L x15, PT_A5(sp) REG_L x16, PT_A6(sp) REG_L x17, PT_A7(sp) + + .if \all == 1 + REG_L x2, PT_SP(sp) + REG_L x3, PT_GP(sp) + REG_L x4, PT_TP(sp) + REG_L x5, PT_T0(sp) + REG_L x6, PT_T1(sp) + REG_L x7, PT_T2(sp) + REG_L x8, PT_S0(sp) + REG_L x9, PT_S1(sp) REG_L x18, PT_S2(sp) REG_L x19, PT_S3(sp) REG_L x20, PT_S4(sp) @@ -128,10 +183,25 @@ REG_L x30, PT_T5(sp) REG_L x31, PT_T6(sp) + .else +#ifdef HAVE_FUNCTION_GRAPH_FP_TEST + REG_L x8, PT_S0(sp) +#endif + .endif addi sp, sp, PT_SIZE_ON_STACK .endm + + .macro PREPARE_ARGS + addi a0, t0, -FENTRY_RA_OFFSET // ip + la a1, function_trace_op + REG_L a2, 0(a1) // op + mv a1, ra // parent_ip + mv a3, sp // fregs + .endm + #endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ +#ifndef CONFIG_DYNAMIC_FTRACE_WITH_REGS ENTRY(ftrace_caller) SAVE_ABI @@ -160,33 +230,29 @@ ftrace_graph_call: jr t0 ENDPROC(ftrace_caller) -#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#else /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ ENTRY(ftrace_regs_caller) - SAVE_ALL - - addi a0, t0, -FENTRY_RA_OFFSET - la a1, function_trace_op - REG_L a2, 0(a1) - mv a1, ra - mv a3, sp + SAVE_ABI_REGS 1 + PREPARE_ARGS ftrace_regs_call: .global ftrace_regs_call call ftrace_stub -#ifdef CONFIG_FUNCTION_GRAPH_TRACER - addi a0, sp, PT_RA - REG_L a1, PT_T0(sp) - addi a1, a1, -FENTRY_RA_OFFSET -#ifdef HAVE_FUNCTION_GRAPH_FP_TEST - mv a2, s0 -#endif -ftrace_graph_regs_call: - .global ftrace_graph_regs_call - call ftrace_stub -#endif - RESTORE_ALL + RESTORE_ABI_REGS 1 jr t0 ENDPROC(ftrace_regs_caller) + +ENTRY(ftrace_caller) + SAVE_ABI_REGS 0 + PREPARE_ARGS + +ftrace_call: + .global ftrace_call + call ftrace_stub + + RESTORE_ABI_REGS 0 + jr t0 +ENDPROC(ftrace_caller) #endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */