From nobody Mon Apr 13 20:07:29 2026 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 98FDBC433FE for ; Wed, 16 Nov 2022 02:54:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232088AbiKPCyG (ORCPT ); Tue, 15 Nov 2022 21:54:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231759AbiKPCxk (ORCPT ); Tue, 15 Nov 2022 21:53:40 -0500 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BF56C2189 for ; Tue, 15 Nov 2022 18:53:35 -0800 (PST) Received: from loongson.cn (unknown [113.200.148.30]) by gateway (Coremail) with SMTP id _____8DxTtuuUHRjuJEHAA--.22333S3; Wed, 16 Nov 2022 10:53:34 +0800 (CST) Received: from localhost.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Dx9VakUHRjO1MUAA--.35612S9; Wed, 16 Nov 2022 10:53:34 +0800 (CST) From: Qing Zhang To: Huacai Chen , Steven Rostedt , Ingo Molnar Cc: loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v7 7/9] LoongArch/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support Date: Wed, 16 Nov 2022 10:53:22 +0800 Message-Id: <20221116025324.1624-8-zhangqing@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221116025324.1624-1-zhangqing@loongson.cn> References: <20221116025324.1624-1-zhangqing@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8Dx9VakUHRjO1MUAA--.35612S9 X-CM-SenderInfo: x2kd0wptlqwqxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjvJXoWxAr43CF45Zr4xCr1fZr4ktFb_yoWrKFyUpF 9xCas5GrWxGF9agrnFqr1j9r4kGrn7Cw1agasFy34FkFsFqFy7Wrn2vryqqF4kt3ykWrWI g3Z5G390ka1UX3JanT9S1TB71UUUUjUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU baxYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l84 ACjcxK6I8E87Iv67AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVCY1x0267AKxVW8Jr0_Cr1U M2kKe7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zV CFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWrXVW3AwAv7VC2 z280aVAFwI0_Cr0_Gr1UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwCF04 k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwCFI7km07C267AKxVWUXVWUAwC2 0s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI 0_JF0_Jw1lIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVW5JVW7JwCI42IY6xIIjxv2 0xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2js IE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZF pf9x07jxSdgUUUUU= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Ftrace_graph_ret_addr can be called by stack unwinding code to convert a found stack return address ('ret') to its original value, in case the function graph tracer has modified it to be 'return_to_handler',If the hasn't been modified, the unchanged value of 'ret' is returned. Signed-off-by: Qing Zhang --- arch/loongarch/include/asm/ftrace.h | 3 +++ arch/loongarch/include/asm/unwind.h | 1 + arch/loongarch/kernel/ftrace_dyn.c | 2 +- arch/loongarch/kernel/unwind_guess.c | 4 +++- arch/loongarch/kernel/unwind_prologue.c | 11 +++++++++-- 5 files changed, 17 insertions(+), 4 deletions(-) diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/a= sm/ftrace.h index 5cc13ae48164..1583ec2171fc 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -6,6 +6,8 @@ #ifndef _ASM_LOONGARCH_FTRACE_H #define _ASM_LOONGARCH_FTRACE_H =20 +#define GRAPH_FAKE_OFFSET (sizeof(struct pt_regs) - offsetof(struct pt_reg= s, regs[1])) + #ifdef CONFIG_FUNCTION_TRACER #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ =20 @@ -33,6 +35,7 @@ void ftrace_graph_func(unsigned long ip, unsigned long pa= rent_ip, #endif =20 #ifdef CONFIG_DYNAMIC_FTRACE +#define HAVE_FUNCTION_GRAPH_RET_ADDR_PTR static inline unsigned long ftrace_call_adjust(unsigned long addr) { return addr; diff --git a/arch/loongarch/include/asm/unwind.h b/arch/loongarch/include/a= sm/unwind.h index a51eec00efb8..f2b52b9ea93d 100644 --- a/arch/loongarch/include/asm/unwind.h +++ b/arch/loongarch/include/asm/unwind.h @@ -21,6 +21,7 @@ struct unwind_state { struct stack_info stack_info; struct task_struct *task; bool first, error, is_ftrace; + int graph_idx; unsigned long sp, pc, ra; }; =20 diff --git a/arch/loongarch/kernel/ftrace_dyn.c b/arch/loongarch/kernel/ftr= ace_dyn.c index f538829312d7..cd64887e26b5 100644 --- a/arch/loongarch/kernel/ftrace_dyn.c +++ b/arch/loongarch/kernel/ftrace_dyn.c @@ -140,7 +140,7 @@ void prepare_ftrace_return(unsigned long self_addr, uns= igned long *parent) =20 old =3D *parent; =20 - if (!function_graph_enter(old, self_addr, 0, NULL)) + if (!function_graph_enter(old, self_addr, 0, parent)) *parent =3D return_hooker; } =20 diff --git a/arch/loongarch/kernel/unwind_guess.c b/arch/loongarch/kernel/u= nwind_guess.c index 5afa6064d73e..229ba014cea0 100644 --- a/arch/loongarch/kernel/unwind_guess.c +++ b/arch/loongarch/kernel/unwind_guess.c @@ -2,6 +2,7 @@ /* * Copyright (C) 2022 Loongson Technology Corporation Limited */ +#include #include =20 #include @@ -53,7 +54,8 @@ bool unwind_next_frame(struct unwind_state *state) state->sp < info->end; state->sp +=3D sizeof(unsigned long)) { addr =3D *(unsigned long *)(state->sp); - + state->pc =3D ftrace_graph_ret_addr(state->task, &state->graph_idx, + addr, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); if (__kernel_text_address(addr)) return true; } diff --git a/arch/loongarch/kernel/unwind_prologue.c b/arch/loongarch/kerne= l/unwind_prologue.c index c5df4ae73e0d..48f7a120ec27 100644 --- a/arch/loongarch/kernel/unwind_prologue.c +++ b/arch/loongarch/kernel/unwind_prologue.c @@ -2,6 +2,7 @@ /* * Copyright (C) 2022 Loongson Technology Corporation Limited */ +#include #include =20 #include @@ -30,6 +31,8 @@ static bool unwind_by_guess(struct unwind_state *state) state->sp < info->end; state->sp +=3D sizeof(unsigned long)) { addr =3D *(unsigned long *)(state->sp); + state->pc =3D ftrace_graph_ret_addr(state->task, &state->graph_idx, + addr, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); if (__kernel_text_address(addr)) return true; } @@ -171,8 +174,11 @@ bool unwind_next_frame(struct unwind_state *state) break; =20 case UNWINDER_PROLOGUE: - if (unwind_by_prologue(state)) + if (unwind_by_prologue(state)) { + state->pc =3D ftrace_graph_ret_addr(state->task, &state->graph_idx, + state->pc, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); return true; + } =20 if (info->type =3D=3D STACK_TYPE_IRQ && info->end =3D=3D state->sp) { @@ -182,8 +188,9 @@ bool unwind_next_frame(struct unwind_state *state) if (user_mode(regs) || !__kernel_text_address(pc)) return false; =20 - state->pc =3D pc; state->sp =3D regs->regs[3]; + state->pc =3D ftrace_graph_ret_addr(state->task, &state->graph_idx, + pc, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); state->ra =3D regs->regs[1]; state->first =3D true; get_stack_info(state->sp, state->task, info); --=20 2.36.0