From mboxrd@z Thu Jan 1 00:00:00 1970 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 8E033ECAAA3 for ; Fri, 26 Aug 2022 07:36:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233959AbiHZHgw (ORCPT ); Fri, 26 Aug 2022 03:36:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229971AbiHZHgf (ORCPT ); Fri, 26 Aug 2022 03:36:35 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E502572B72 for ; Fri, 26 Aug 2022 00:36:32 -0700 (PDT) Received: from localhost.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8DxX+D6dwhjNj0KAA--.45610S3; Fri, 26 Aug 2022 15:36:27 +0800 (CST) From: Qing Zhang To: Huacai Chen , Steven Rostedt , Ingo Molnar Cc: WANG Xuerui , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org, Jiaxun Yang , hejinyang@loongson.cn Subject: [PATCH v2 8/9] LoongArch/ftrace: Add HAVE_FUNCTION_GRAPH_RET_ADDR_PTR support Date: Fri, 26 Aug 2022 15:36:25 +0800 Message-Id: <20220826073626.1716-2-zhangqing@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220826073626.1716-1-zhangqing@loongson.cn> References: <20220826073626.1716-1-zhangqing@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID: AQAAf8DxX+D6dwhjNj0KAA--.45610S3 X-Coremail-Antispam: 1UD129KBjvJXoWxAr43CF45Zr4xCr1fZr4ktFb_yoWrtF1xpF 9xAas5GrWxWF9agrnFqr1Uur4kGrnF9w1agFWDtryFkFsFqF17WrnFvryDXFWkt3ykWrWI qas5GrZ0kF4UX3JanT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUBm14x267AKxVW5JVWrJwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2048vs2IY020E87I2jVAFwI0_Jr4l82xGYIkIc2 x26xkF7I0E14v26r1I6r4UM28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8wA2z4x0 Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr1j6F4UJw A2z4x0Y4vEx4A2jsIE14v26F4UJVW0owA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_GcCE3s1l e2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI 8IcVAFwI0_JrI_JrylYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJVW8JwAC jcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lc2xSY4AK67AK6r4xMxAIw2 8IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4l x2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrw CI42IY6xIIjxv20xvE14v26r1I6r4UMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1l IxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4 A2jsIEc7CjxVAFwI0_Gr1j6F4UJbIYCTnIWIevJa73UjIFyTuYvjfUnCzuDUUUU X-CM-SenderInfo: x2kd0wptlqwqxorr0wxvrqhubq/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 | 10 +++++++++- 5 files changed, 17 insertions(+), 3 deletions(-) diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/asm/ftrace.h index ce119496c6d0..0c306f42a512 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -10,6 +10,8 @@ #define FTRACE_REGS_PLT_IDX 1 #define NR_FTRACE_PLTS 2 +#define GRAPH_FAKE_OFFSET (sizeof(struct pt_regs) - offsetof(struct pt_regs, regs[1])) + #ifdef CONFIG_FUNCTION_TRACER #define MCOUNT_INSN_SIZE 4 /* sizeof mcount call */ @@ -20,6 +22,7 @@ extern void _mcount(void); #endif #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/asm/unwind.h index 6af4718bdf01..f66b07c3e6a1 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; + int graph_idx; unsigned long sp, pc, ra; }; diff --git a/arch/loongarch/kernel/ftrace_dyn.c b/arch/loongarch/kernel/ftrace_dyn.c index dd37185d446e..b070ce225989 100644 --- a/arch/loongarch/kernel/ftrace_dyn.c +++ b/arch/loongarch/kernel/ftrace_dyn.c @@ -219,7 +219,7 @@ void prepare_ftrace_return(unsigned long self_addr, unsigned long *parent) old = *parent; - if (!function_graph_enter(old, self_addr, 0, NULL)) + if (!function_graph_enter(old, self_addr, 0, parent)) *parent = return_hooker; } diff --git a/arch/loongarch/kernel/unwind_guess.c b/arch/loongarch/kernel/unwind_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 #include @@ -53,7 +54,8 @@ bool unwind_next_frame(struct unwind_state *state) state->sp < info->end; state->sp += sizeof(unsigned long)) { addr = *(unsigned long *)(state->sp); - + state->pc = 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/kernel/unwind_prologue.c index b206d9159205..03f8b31a90cc 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 #include @@ -32,6 +33,8 @@ static bool unwind_by_guess(struct unwind_state *state) state->sp < info->end; state->sp += sizeof(unsigned long)) { addr = *(unsigned long *)(state->sp); + state->pc = ftrace_graph_ret_addr(state->task, &state->graph_idx, + addr, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); if (__kernel_text_address(addr)) return true; } @@ -146,8 +149,11 @@ bool unwind_next_frame(struct unwind_state *state) break; case UNWINDER_PROLOGUE: - if (unwind_by_prologue(state)) + if (unwind_by_prologue(state)) { + state->pc = ftrace_graph_ret_addr(state->task, &state->graph_idx, + state->pc, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); return true; + } if (info->type == STACK_TYPE_IRQ && info->end == state->sp) { @@ -159,6 +165,8 @@ bool unwind_next_frame(struct unwind_state *state) state->pc = pc; state->sp = regs->regs[3]; + state->pc = ftrace_graph_ret_addr(state->task, &state->graph_idx, + pc, (unsigned long *)(state->sp - GRAPH_FAKE_OFFSET)); state->ra = regs->regs[1]; state->first = true; get_stack_info(state->sp, state->task, info); -- 2.20.1