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[2620:137:e000::1:20]) by mx.google.com with ESMTP id x7-20020a05640226c700b004520e27e5b9si12358188edd.626.2022.11.14.18.58.56; Mon, 14 Nov 2022 18:59:20 -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; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237789AbiKOC5c (ORCPT + 99 others); Mon, 14 Nov 2022 21:57:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232592AbiKOC45 (ORCPT ); Mon, 14 Nov 2022 21:56:57 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B151E1EC56 for ; Mon, 14 Nov 2022 18:55:35 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8Axz7ek_3Jjex8HAA--.16482S3; Tue, 15 Nov 2022 10:55:32 +0800 (CST) Received: from localhost.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxLuKf_3JjmywTAA--.51398S7; Tue, 15 Nov 2022 10:55:31 +0800 (CST) From: Qing Zhang To: Huacai Chen , Steven Rostedt , Ingo Molnar Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, Jinyang He Subject: [PATCH v6 5/9] LoongArch/ftrace: Add DYNAMIC_FTRACE_WITH_REGS support Date: Tue, 15 Nov 2022 10:55:23 +0800 Message-Id: <20221115025527.13382-6-zhangqing@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221115025527.13382-1-zhangqing@loongson.cn> References: <20221115025527.13382-1-zhangqing@loongson.cn> MIME-Version: 1.0 X-CM-TRANSID: AQAAf8CxLuKf_3JjmywTAA--.51398S7 X-CM-SenderInfo: x2kd0wptlqwqxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxCF43Gry5Zr1ktr17XFWUJwb_yoWrWw1Dpr 97Arn5GFWj9FsagrWfK3s5Wrs8JrWvg34ava9rAFyrGr4qqF15Z3y8Cr1DZFyIq3yxG3yx XF1fCr4Yya17XwUanT9S1TB71UUUUjUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b3AYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW5JVW7JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwA2z4 x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26r4UJVWxJr1l n4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2x26I8E6x ACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1q6rW5McIj6I8E 87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82 IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxYO2xFxVAFwI0_Jrv_JF1lx2Iq xVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r 126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Xr0_Ar1lIxAIcVC0I7IYx2IY 6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67 AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuY vjxU4AhLUUUUU X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_PASS, 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?1749529301095993686?= X-GMAIL-MSGID: =?utf-8?q?1749529301095993686?= This patch implements DYNAMIC_FTRACE_WITH_REGS on LoongArch, which allows a traced function's arguments (and some other registers) to be captured into a struct pt_regs, allowing these to be inspected and modified. Co-developed-by: Jinyang He Signed-off-by: Jinyang He Signed-off-by: Qing Zhang --- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/ftrace.h | 3 +++ arch/loongarch/kernel/ftrace_dyn.c | 17 ++++++++++++++ arch/loongarch/kernel/mcount-dyn.S | 36 +++++++++++++++++++++++++++-- 4 files changed, 55 insertions(+), 2 deletions(-) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 615ce62422b8..12e3e91a68ae 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -90,6 +90,7 @@ config LOONGARCH select HAVE_DEBUG_STACKOVERFLOW select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE + select HAVE_DYNAMIC_FTRACE_WITH_REGS select HAVE_EBPF_JIT select HAVE_EXIT_THREAD select HAVE_FAST_GUP diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h index 76ca58767f4d..a3f974a7a5ce 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -28,6 +28,9 @@ struct dyn_ftrace; int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec); #define ftrace_init_nop ftrace_init_nop +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +#define ARCH_SUPPORTS_FTRACE_OPS 1 +#endif #endif /* CONFIG_DYNAMIC_FTRACE */ #endif /* __ASSEMBLY__ */ #endif /* CONFIG_FUNCTION_TRACER */ diff --git a/arch/loongarch/kernel/ftrace_dyn.c b/arch/loongarch/kernel/ftrace_dyn.c index 3fe791b6783e..ec3d951be50c 100644 --- a/arch/loongarch/kernel/ftrace_dyn.c +++ b/arch/loongarch/kernel/ftrace_dyn.c @@ -99,6 +99,23 @@ int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, return ftrace_modify_code(pc, old, new, true); } +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, + unsigned long addr) +{ + unsigned long pc; + long offset; + u32 old, new; + + pc = rec->ip + LOONGARCH_INSN_SIZE; + + old = larch_insn_gen_bl(pc, old_addr); + new = larch_insn_gen_bl(pc, addr); + + return ftrace_modify_code(pc, old, new, true); +} +#endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */ + void arch_ftrace_update_code(int command) { command |= FTRACE_MAY_SLEEP; diff --git a/arch/loongarch/kernel/mcount-dyn.S b/arch/loongarch/kernel/mcount-dyn.S index 0c12cc108e6f..02835186b463 100644 --- a/arch/loongarch/kernel/mcount-dyn.S +++ b/arch/loongarch/kernel/mcount-dyn.S @@ -27,7 +27,7 @@ * follows the LoongArch psABI well. */ - .macro ftrace_regs_entry + .macro ftrace_regs_entry allregs=0 PTR_ADDI sp, sp, -PT_SIZE /* Save trace function ra at PT_ERA */ PTR_S ra, sp, PT_ERA @@ -43,16 +43,48 @@ PTR_S a7, sp, PT_R11 PTR_S fp, sp, PT_R22 + .if \allregs + PTR_S t0, sp, PT_R12 + PTR_S t1, sp, PT_R13 + PTR_S t2, sp, PT_R14 + PTR_S t3, sp, PT_R15 + PTR_S t4, sp, PT_R16 + PTR_S t5, sp, PT_R17 + PTR_S t6, sp, PT_R18 + PTR_S t7, sp, PT_R19 + PTR_S t8, sp, PT_R20 + PTR_S s0, sp, PT_R23 + PTR_S s1, sp, PT_R24 + PTR_S s2, sp, PT_R25 + PTR_S s3, sp, PT_R26 + PTR_S s4, sp, PT_R27 + PTR_S s5, sp, PT_R28 + PTR_S s6, sp, PT_R29 + PTR_S s7, sp, PT_R30 + PTR_S s8, sp, PT_R31 + PTR_S tp, sp, PT_R2 + /* Clear it for later use as a flag sometimes. */ + PTR_S zero, sp, PT_R0 + PTR_S $r21, sp, PT_R21 + .endif + PTR_ADDI t8, sp, PT_SIZE PTR_S t8, sp, PT_R3 .endm SYM_CODE_START(ftrace_caller) - ftrace_regs_entry + ftrace_regs_entry allregs=0 b ftrace_common SYM_CODE_END(ftrace_caller) +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS +SYM_CODE_START(ftrace_regs_caller) + ftrace_regs_entry allregs=1 + b ftrace_common +SYM_CODE_END(ftrace_regs_caller) +#endif + SYM_CODE_START(ftrace_common) PTR_ADDI a0, ra, -8 /* arg0: ip */ move a1, t0 /* arg1: parent_ip */