From patchwork Tue Dec 3 17:21:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Michel Hautbois X-Patchwork-Id: 13892737 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 585921FA251; Tue, 3 Dec 2024 17:21:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733246514; cv=none; b=UBiHQAw/FRV2SCQv8jvTRA/NgjxPXvsKwTe5TDMqsCgCYvxIV7yImOsEf3QCXsJGauRCsPp7VNj5ASameMw4iK0X11+EwHU9uhGyVFjDn6AeKhjaJbF4M1b+wkTGWRFI851lDE5NfnHolwLcLlIa0OdKGddH+v52o5Mx9YifLOY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733246514; c=relaxed/simple; bh=1CN8q8CgvimUvygXr+D0mvbJuGn4uhqxoM/VGe7tMBk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=n60Tu9EZSHc0ARjcUeubUKaN49UhjPvwU6sSq3M3tjFwoy38zrB3fBzfLnjvIaNqhuvFrkWaTnUlRhzIdY/eIAbfd4QdaR2tpuB4zGCGylvlCSgcAkWua5Od0HtZCGGfXT32S+XRlVoPAqiTMLDOWbhCfo3P2of6LrYfydMLIvw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=yoseli.org; spf=none smtp.mailfrom=yoseli.org; dkim=pass (2048-bit key) header.d=yoseli.org header.i=@yoseli.org header.b=KjWPc5vS; arc=none smtp.client-ip=217.70.183.193 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=yoseli.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=yoseli.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=yoseli.org header.i=@yoseli.org header.b="KjWPc5vS" Received: by mail.gandi.net (Postfix) with ESMTPSA id AA53A24000C; Tue, 3 Dec 2024 17:21:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yoseli.org; s=gm1; t=1733246505; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=78Wm87mcvcNcizl2XQuljczepplgaf9PD3511aCnbuA=; b=KjWPc5vSM74LB0N3INECiT21QX3XEVi3ueDx/AP0waRDW6tPvi43adEA6TNhCNFcQ8JvP3 H9J2G2sevee8lGzz3rtG6OaIaYzEofbgLQz7QfKPcL2gagV6irVLMP62R1nhnTTDANUHCv gPdA3HsWr+tw5+WW/eJs4aj8M6wzIAcErjqQ0LbX1hz4RzYxz+kotYFMovUDp1tyaaB47J YAd1E3ebV6oxV+6O7+IWjS6HkJBxRS2RZIdE7hvMPX4ouGFeCiwS0utGnr1iqKKr8EvjA+ uFQ6h9zuPzodgGtLTwRcDjavtIeZSMDJHHnlD7yqGQLcEuu1e3tUcqexjYIewQ== From: Jean-Michel Hautbois Date: Tue, 03 Dec 2024 18:21:39 +0100 Subject: [PATCH v2 2/2] arch: m68k: Add STACKTRACE support Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241203-add-m68k-tracing-support-v2-2-77302097a9f4@yoseli.org> References: <20241203-add-m68k-tracing-support-v2-0-77302097a9f4@yoseli.org> In-Reply-To: <20241203-add-m68k-tracing-support-v2-0-77302097a9f4@yoseli.org> To: Geert Uytterhoeven Cc: linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, rostedt@goodmis.org, Jean-Michel Hautbois X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1733246503; l=3232; i=jeanmichel.hautbois@yoseli.org; s=20240925; h=from:subject:message-id; bh=1CN8q8CgvimUvygXr+D0mvbJuGn4uhqxoM/VGe7tMBk=; b=Ge1GOk63fVTAu5a0TTZcQM9v3E6LsCyJmDJgyWxSQFvMR54I1JAoXcrAwzT5O8lcOWL7dINR5 kfb5DzgQwgGC9rKh3CsJYuQtiu3jg0/AC2kShcDBecgl2A2Ujmn8y9q X-Developer-Key: i=jeanmichel.hautbois@yoseli.org; a=ed25519; pk=MsMTVmoV69wLIlSkHlFoACIMVNQFyvJzvsJSQsn/kq4= X-GND-Sasl: jeanmichel.hautbois@yoseli.org In order to use tracing, implement a basic arch_stack_walk() based on the one in PowerPC. Tested on a M54418 coldfire. Signed-off-by: Jean-Michel Hautbois --- arch/m68k/Kconfig | 6 ++++ arch/m68k/kernel/Makefile | 1 + arch/m68k/kernel/stacktrace.c | 70 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 77 insertions(+) diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 793ab1e2762609725bbf793f6dffecfa3ecfff0f..6ba3238ba2c68acaf5974396739e629b09eee3ca 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -40,6 +40,8 @@ config M68K select UACCESS_MEMCPY if !MMU select ZONE_DMA select TRACE_IRQFLAGS_SUPPORT + select ARCH_STACKWALK + select ARCH_WANT_FRAME_POINTERS config CPU_BIG_ENDIAN def_bool y @@ -106,6 +108,10 @@ config BOOTINFO_PROC Say Y to export the bootinfo used to boot the kernel in a "bootinfo" file in procfs. This is useful with kexec. +config STACKTRACE_SUPPORT + bool + default y + menu "Platform setup" source "arch/m68k/Kconfig.cpu" diff --git a/arch/m68k/kernel/Makefile b/arch/m68k/kernel/Makefile index 6c732ed3998b714a4842ee29c977550a61979779..cb02bcfe04c6b265fa97db9237395a262e649989 100644 --- a/arch/m68k/kernel/Makefile +++ b/arch/m68k/kernel/Makefile @@ -23,3 +23,4 @@ obj-$(CONFIG_UBOOT) += uboot.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o +obj-y += stacktrace.o diff --git a/arch/m68k/kernel/stacktrace.c b/arch/m68k/kernel/stacktrace.c new file mode 100644 index 0000000000000000000000000000000000000000..4c2fb6b0cf675ee5a3a21393a50603fea98a1b03 --- /dev/null +++ b/arch/m68k/kernel/stacktrace.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Stack trace utility functions etc. + * + * Copyright 2024 Jean-Michel Hautbois, Yoseli SAS. + */ + +#include +#include +#include +#include +#include + +static inline unsigned long current_stack_frame(void) +{ + unsigned long sp; + + asm volatile("movl %%fp, %0" : "=r"(sp)); + return sp; +} + +static inline int validate_sp(unsigned long sp, struct task_struct *task) +{ + unsigned long stack_start, stack_end; + + if (task == current) + stack_start = (unsigned long)task_stack_page(task); + else + stack_start = (unsigned long)task->thread.esp0; + + stack_end = stack_start + THREAD_SIZE; + + if (sp < stack_start || sp >= stack_end) + return 0; + + return 1; +} + +void __no_sanitize_address arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, + struct task_struct *task, struct pt_regs *regs) +{ + unsigned long sp; + + if (regs && !consume_entry(cookie, regs->pc)) + return; + + if (regs) + sp = (unsigned long) regs; + else if (task == current) + sp = current_stack_frame(); + else + sp = task->thread.ksp; + + for (;;) { + unsigned long *stack = (unsigned long *) sp; + unsigned long newsp, ip; + + if (!validate_sp(sp, task)) + return; + + newsp = stack[0]; + ip = stack[1]; + + if (!consume_entry(cookie, ip)) + return; + + sp = newsp; + } +}