2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
4 * Copyright (C) 2009 Matt Fleming
6 #include <linux/kallsyms.h>
7 #include <linux/ftrace.h>
8 #include <linux/debug_locks.h>
9 #include <asm/unwinder.h>
10 #include <asm/stacktrace.h>
12 void printk_address(unsigned long address, int reliable)
14 printk(" [<%p>] %s%pS\n", (void *) address,
15 reliable ? "" : "? ", (void *) address);
18 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
20 print_ftrace_graph_addr(unsigned long addr, void *data,
21 const struct stacktrace_ops *ops,
22 struct thread_info *tinfo, int *graph)
24 struct task_struct *task = tinfo->task;
25 unsigned long ret_addr;
26 int index = task->curr_ret_stack;
28 if (addr != (unsigned long)return_to_handler)
31 if (!task->ret_stack || index < *graph)
35 ret_addr = task->ret_stack[index].ret;
37 ops->address(data, ret_addr, 1);
43 print_ftrace_graph_addr(unsigned long addr, void *data,
44 const struct stacktrace_ops *ops,
45 struct thread_info *tinfo, int *graph)
50 stack_reader_dump(struct task_struct *task, struct pt_regs *regs,
51 unsigned long *sp, const struct stacktrace_ops *ops,
54 struct thread_info *context;
57 context = (struct thread_info *)
58 ((unsigned long)sp & (~(THREAD_SIZE - 1)));
60 while (!kstack_end(sp)) {
61 unsigned long addr = *sp++;
63 if (__kernel_text_address(addr)) {
64 ops->address(data, addr, 1);
66 print_ftrace_graph_addr(addr, data, ops,
73 print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
76 print_symbol(msg, symbol);
80 static void print_trace_warning(void *data, char *msg)
82 printk("%s%s\n", (char *)data, msg);
85 static int print_trace_stack(void *data, char *name)
87 printk("%s <%s> ", (char *)data, name);
92 * Print one address/symbol entries per line.
94 static void print_trace_address(void *data, unsigned long addr, int reliable)
97 printk_address(addr, reliable);
100 static const struct stacktrace_ops print_trace_ops = {
101 .warning = print_trace_warning,
102 .warning_symbol = print_trace_warning_symbol,
103 .stack = print_trace_stack,
104 .address = print_trace_address,
107 void show_trace(struct task_struct *tsk, unsigned long *sp,
108 struct pt_regs *regs)
110 if (regs && user_mode(regs))
113 printk("\nCall trace:\n");
115 unwind_stack(tsk, regs, sp, &print_trace_ops, "");
122 debug_show_held_locks(tsk);