163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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* Copyright (C) 2009 Matt Fleming
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* Copyright (C) 2002 - 2012 Paul Mundt
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*/
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#include <linux/kallsyms.h>
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#include <linux/ftrace.h>
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#include <linux/debug_locks.h>
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#include <linux/sched/debug.h>
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#include <linux/sched/task_stack.h>
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#include <linux/kdebug.h>
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#include <linux/export.h>
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#include <linux/uaccess.h>
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#include <asm/unwinder.h>
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#include <asm/stacktrace.h>
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void dump_mem(const char *str, const char *loglvl,
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unsigned long bottom, unsigned long top)
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{
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unsigned long p;
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int i;
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printk("%s%s(0x%08lx to 0x%08lx)\n", loglvl, str, bottom, top);
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for (p = bottom & ~31; p < top; ) {
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printk("%s%04lx: ", loglvl, p & 0xffff);
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for (i = 0; i < 8; i++, p += 4) {
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unsigned int val;
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if (p < bottom || p >= top)
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printk("%s ", loglvl);
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else {
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if (__get_user(val, (unsigned int __user *)p)) {
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printk("%s\n", loglvl);
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return;
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}
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printk("%s%08x ", loglvl, val);
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}
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}
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printk("%s\n", loglvl);
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}
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}
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void printk_address(unsigned long address, int reliable, const char *loglvl)
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{
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printk("%s [<%p>] %s%pS\n", loglvl, (void *) address,
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reliable ? "" : "? ", (void *) address);
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}
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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static void
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print_ftrace_graph_addr(unsigned long addr, void *data,
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const struct stacktrace_ops *ops,
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struct thread_info *tinfo, int *graph)
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{
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struct task_struct *task = tinfo->task;
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struct ftrace_ret_stack *ret_stack;
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unsigned long ret_addr;
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if (addr != (unsigned long)return_to_handler)
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return;
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if (!task->ret_stack)
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return;
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ret_stack = ftrace_graph_get_ret_stack(task, *graph);
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if (!ret_stack)
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return;
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ret_addr = ret_stack->ret;
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ops->address(data, ret_addr, 1);
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(*graph)++;
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}
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#else
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static inline void
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print_ftrace_graph_addr(unsigned long addr, void *data,
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const struct stacktrace_ops *ops,
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struct thread_info *tinfo, int *graph)
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{ }
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#endif
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void
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stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
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unsigned long *sp, const struct stacktrace_ops *ops,
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void *data)
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{
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struct thread_info *context;
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int graph = 0;
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context = (struct thread_info *)
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((unsigned long)sp & (~(THREAD_SIZE - 1)));
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while (!kstack_end(sp)) {
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unsigned long addr = *sp++;
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if (__kernel_text_address(addr)) {
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ops->address(data, addr, 1);
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print_ftrace_graph_addr(addr, data, ops,
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context, &graph);
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}
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}
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}
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static int print_trace_stack(void *data, char *name)
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{
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printk("%s <%s> ", (char *)data, name);
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return 0;
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}
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/*
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* Print one address/symbol entries per line.
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*/
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static void print_trace_address(void *data, unsigned long addr, int reliable)
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{
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printk_address(addr, reliable, (char *)data);
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}
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static const struct stacktrace_ops print_trace_ops = {
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.stack = print_trace_stack,
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.address = print_trace_address,
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};
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void show_trace(struct task_struct *tsk, unsigned long *sp,
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struct pt_regs *regs, const char *loglvl)
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{
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if (regs && user_mode(regs))
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return;
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printk("%s\nCall trace:\n", loglvl);
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unwind_stack(tsk, regs, sp, &print_trace_ops, (void *)loglvl);
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printk("%s\n", loglvl);
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if (!tsk)
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tsk = current;
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debug_show_held_locks(tsk);
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}
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void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl)
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{
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unsigned long stack;
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if (!tsk)
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tsk = current;
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if (tsk == current)
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sp = (unsigned long *)current_stack_pointer;
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else
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sp = (unsigned long *)tsk->thread.sp;
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stack = (unsigned long)sp;
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dump_mem("Stack: ", loglvl, stack, THREAD_SIZE +
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(unsigned long)task_stack_page(tsk));
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show_trace(tsk, sp, NULL, loglvl);
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}
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