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 <jeanmichel.hautb...@yoseli.org>
---
arch/m68k/Kconfig | 5 ++++
arch/m68k/kernel/Makefile | 1 +
arch/m68k/kernel/stacktrace.c | 70 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 76 insertions(+)
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index
793ab1e2762609725bbf793f6dffecfa3ecfff0f..3ad8596aab71190807f8c11dd5876aa1198760f3
100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -106,6 +106,11 @@ 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
+ def_bool MMU_COLDFIRE
+ select ARCH_STACKWALK
+ select ARCH_WANT_FRAME_POINTERS
+
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 <asm/current.h>
+#include <asm/ptrace.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/stacktrace.h>
+
+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;
+ }
+}
--
2.39.5
