From 2ce36bfa6a0904524baed699ad78706e50295f84 Mon Sep 17 00:00:00 2001 From: Guo Ren Date: Wed, 5 Sep 2018 14:25:19 +0800 Subject: csky: Debug and Ptrace GDB This patch adds arch ptrace implementation, stack dump and bug.h. Signed-off-by: Guo Ren Reviewed-by: Arnd Bergmann --- arch/csky/kernel/dumpstack.c | 66 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 arch/csky/kernel/dumpstack.c (limited to 'arch/csky/kernel/dumpstack.c') diff --git a/arch/csky/kernel/dumpstack.c b/arch/csky/kernel/dumpstack.c new file mode 100644 index 000000000000..a9a03ac57ec5 --- /dev/null +++ b/arch/csky/kernel/dumpstack.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include + +int kstack_depth_to_print = 48; + +void show_trace(unsigned long *stack) +{ + unsigned long *endstack; + unsigned long addr; + int i; + + pr_info("Call Trace:\n"); + addr = (unsigned long)stack + THREAD_SIZE - 1; + endstack = (unsigned long *)(addr & -THREAD_SIZE); + i = 0; + while (stack + 1 <= endstack) { + addr = *stack++; + /* + * If the address is either in the text segment of the + * kernel, or in the region which contains vmalloc'ed + * memory, it *may* be the address of a calling + * routine; if so, print it so that someone tracing + * down the cause of the crash will be able to figure + * out the call path that was taken. + */ + if (__kernel_text_address(addr)) { +#ifndef CONFIG_KALLSYMS + if (i % 5 == 0) + pr_cont("\n "); +#endif + pr_cont(" [<%08lx>] %pS\n", addr, (void *)addr); + i++; + } + } + pr_cont("\n"); +} + +void show_stack(struct task_struct *task, unsigned long *stack) +{ + unsigned long *p; + unsigned long *endstack; + int i; + + if (!stack) { + if (task) + stack = (unsigned long *)task->thread.esp0; + else + stack = (unsigned long *)&stack; + } + endstack = (unsigned long *) + (((unsigned long)stack + THREAD_SIZE - 1) & -THREAD_SIZE); + + pr_info("Stack from %08lx:", (unsigned long)stack); + p = stack; + for (i = 0; i < kstack_depth_to_print; i++) { + if (p + 1 > endstack) + break; + if (i % 8 == 0) + pr_cont("\n "); + pr_cont(" %08lx", *p++); + } + pr_cont("\n"); + show_trace(stack); +} -- cgit v1.2.3