From patchwork Tue Mar 28 13:43:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: pengdonglin X-Patchwork-Id: 13191080 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4F84FC761AF for ; Tue, 28 Mar 2023 13:44:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232546AbjC1Nog (ORCPT ); Tue, 28 Mar 2023 09:44:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49334 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233298AbjC1NoQ (ORCPT ); Tue, 28 Mar 2023 09:44:16 -0400 Received: from mail-m118111.qiye.163.com (mail-m118111.qiye.163.com [115.236.118.111]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3860C640; Tue, 28 Mar 2023 06:44:01 -0700 (PDT) Received: from ubuntu.localdomain (unknown [117.133.56.22]) by mail-m118111.qiye.163.com (Hmail) with ESMTPA id 487B1580407; Tue, 28 Mar 2023 21:43:32 +0800 (CST) From: Donglin Peng To: mhiramat@kernel.org, rostedt@goodmis.org, linux@armlinux.org.uk, mark.rutland@arm.com, will@kernel.org, catalin.marinas@arm.com, palmer@dabbelt.com, paul.walmsley@sifive.com, tglx@linutronix.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, chenhuacai@kernel.org, zhangqing@loongson.cn, kernel@xen0n.name, mingo@redhat.com, peterz@infradead.org, xiehuan09@gmail.com, dinghui@sangfor.com.cn, huangcun@sangfor.com.cn, dolinux.peng@gmail.com Cc: linux-trace-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Donglin Peng Subject: [PATCH v8 7/8] LoongArch: ftrace: Enable HAVE_FUNCTION_GRAPH_RETVAL Date: Tue, 28 Mar 2023 06:43:18 -0700 Message-Id: <20230328134319.2185812-8-pengdonglin@sangfor.com.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230328134319.2185812-1-pengdonglin@sangfor.com.cn> References: <20230328134319.2185812-1-pengdonglin@sangfor.com.cn> MIME-Version: 1.0 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWS1ZQUlXWQ8JGhUIEh9ZQVlDHhkYVh4aTUkZHx1DH0xISlUTARMWGhIXJBQOD1 lXWRgSC1lBWUpKTFVKSEhVTk1VSUlZV1kWGg8SFR0UWUFZT0tIVUpKS09LQ1VKS0tVS1kG X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NjY6PRw4Ej0KA1YfAQsTDzUv IxBPCxJVSlVKTUNLS0pKS0pITEpIVTMWGhIXVQseFRwfFBUcFxIVOwgaFRwdFAlVGBQWVRgVRVlX WRILWUFZSkpMVUpISFVOTVVJSVlXWQgBWUFOQ0xCNwY+ X-HM-Tid: 0a872875ac292eb7kusn487b1580407 X-HM-MType: 1 Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org The commit d4815c5d1bbd ("function_graph: Support recording and printing the return value of function") laid the groundwork for the for the funcgraph-retval, and this modification makes it available on the LoongArch platform. We introduce a new structure called fgraph_ret_regs for the LoongArch platform to hold return registers and the frame pointer. We then fill its content in the return_to_handler and pass its address to the function ftrace_return_to_handler to record the return value. Signed-off-by: Donglin Peng --- v8: - Modify the control range of CONFIG_HAVE_FUNCTION_GRAPH_RETVAL --- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/ftrace.h | 18 ++++++++++++++++++ arch/loongarch/kernel/mcount.S | 6 ++++-- arch/loongarch/kernel/mcount_dyn.S | 7 ++++--- 4 files changed, 27 insertions(+), 5 deletions(-) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 7fd51257e0ed..4bf60132869b 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -99,6 +99,7 @@ config LOONGARCH select HAVE_FAST_GUP select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_ARG_ACCESS_API + select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_TRACER select HAVE_GENERIC_VDSO diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h index 3418d32d4fc7..433c6218888b 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -63,4 +63,22 @@ void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, #endif /* CONFIG_FUNCTION_TRACER */ +#ifndef __ASSEMBLY__ +struct fgraph_ret_regs { + unsigned long a0; + unsigned long a1; + unsigned long fp; +}; + +static inline unsigned long fgraph_ret_regs_return_value(struct fgraph_ret_regs *ret_regs) +{ + return ret_regs->a0; +} + +static inline unsigned long fgraph_ret_regs_frame_pointer(struct fgraph_ret_regs *ret_regs) +{ + return ret_regs->fp; +} +#endif + #endif /* _ASM_LOONGARCH_FTRACE_H */ diff --git a/arch/loongarch/kernel/mcount.S b/arch/loongarch/kernel/mcount.S index 8cdc1563cd33..3e405c0212c0 100644 --- a/arch/loongarch/kernel/mcount.S +++ b/arch/loongarch/kernel/mcount.S @@ -79,10 +79,12 @@ SYM_FUNC_START(ftrace_graph_caller) SYM_FUNC_END(ftrace_graph_caller) SYM_FUNC_START(return_to_handler) - PTR_ADDI sp, sp, -2 * SZREG + PTR_ADDI sp, sp, -3 * SZREG PTR_S a0, sp, 0 PTR_S a1, sp, SZREG + PTR_S zero, sp, 2 * SZREG + move a0, sp bl ftrace_return_to_handler /* Restore the real parent address: a0 -> ra */ @@ -90,7 +92,7 @@ SYM_FUNC_START(return_to_handler) PTR_L a0, sp, 0 PTR_L a1, sp, SZREG - PTR_ADDI sp, sp, 2 * SZREG + PTR_ADDI sp, sp, 3 * SZREG jr ra SYM_FUNC_END(return_to_handler) #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ diff --git a/arch/loongarch/kernel/mcount_dyn.S b/arch/loongarch/kernel/mcount_dyn.S index bbabf06244c2..ab85a953c6d3 100644 --- a/arch/loongarch/kernel/mcount_dyn.S +++ b/arch/loongarch/kernel/mcount_dyn.S @@ -131,18 +131,19 @@ SYM_CODE_END(ftrace_graph_caller) SYM_CODE_START(return_to_handler) /* Save return value regs */ - PTR_ADDI sp, sp, -2 * SZREG + PTR_ADDI sp, sp, -3 * SZREG PTR_S a0, sp, 0 PTR_S a1, sp, SZREG + PTR_S zero, sp, 2 * SZREG - move a0, zero + move a0, sp bl ftrace_return_to_handler move ra, a0 /* Restore return value regs */ PTR_L a0, sp, 0 PTR_L a1, sp, SZREG - PTR_ADDI sp, sp, 2 * SZREG + PTR_ADDI sp, sp, 3 * SZREG jr ra SYM_CODE_END(return_to_handler)