Matt Fleming | 4e14dfc | 2009-08-07 16:11:19 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
| 4 | * Copyright (C) 2009 Matt Fleming |
| 5 | */ |
| 6 | #include <linux/kallsyms.h> |
| 7 | #include <linux/ftrace.h> |
| 8 | #include <linux/debug_locks.h> |
Matt Fleming | 0eff9f6 | 2009-08-11 22:43:20 +0100 | [diff] [blame] | 9 | #include <asm/unwinder.h> |
Matt Fleming | 4e14dfc | 2009-08-07 16:11:19 +0100 | [diff] [blame] | 10 | #include <asm/stacktrace.h> |
| 11 | |
| 12 | void printk_address(unsigned long address, int reliable) |
| 13 | { |
| 14 | printk(" [<%p>] %s%pS\n", (void *) address, |
| 15 | reliable ? "" : "? ", (void *) address); |
| 16 | } |
| 17 | |
| 18 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
| 19 | static void |
| 20 | print_ftrace_graph_addr(unsigned long addr, void *data, |
| 21 | const struct stacktrace_ops *ops, |
| 22 | struct thread_info *tinfo, int *graph) |
| 23 | { |
| 24 | struct task_struct *task = tinfo->task; |
| 25 | unsigned long ret_addr; |
| 26 | int index = task->curr_ret_stack; |
| 27 | |
| 28 | if (addr != (unsigned long)return_to_handler) |
| 29 | return; |
| 30 | |
| 31 | if (!task->ret_stack || index < *graph) |
| 32 | return; |
| 33 | |
| 34 | index -= *graph; |
| 35 | ret_addr = task->ret_stack[index].ret; |
| 36 | |
| 37 | ops->address(data, ret_addr, 1); |
| 38 | |
| 39 | (*graph)++; |
| 40 | } |
| 41 | #else |
| 42 | static inline void |
| 43 | print_ftrace_graph_addr(unsigned long addr, void *data, |
| 44 | const struct stacktrace_ops *ops, |
| 45 | struct thread_info *tinfo, int *graph) |
| 46 | { } |
| 47 | #endif |
| 48 | |
Matt Fleming | 0eff9f6 | 2009-08-11 22:43:20 +0100 | [diff] [blame] | 49 | void |
| 50 | stack_reader_dump(struct task_struct *task, struct pt_regs *regs, |
| 51 | unsigned long *sp, const struct stacktrace_ops *ops, |
| 52 | void *data) |
Matt Fleming | 4e14dfc | 2009-08-07 16:11:19 +0100 | [diff] [blame] | 53 | { |
| 54 | struct thread_info *context; |
| 55 | int graph = 0; |
| 56 | |
| 57 | context = (struct thread_info *) |
| 58 | ((unsigned long)sp & (~(THREAD_SIZE - 1))); |
| 59 | |
| 60 | while (!kstack_end(sp)) { |
| 61 | unsigned long addr = *sp++; |
| 62 | |
| 63 | if (__kernel_text_address(addr)) { |
Paul Mundt | f9967e2 | 2009-08-15 01:09:03 +0900 | [diff] [blame] | 64 | ops->address(data, addr, 1); |
Matt Fleming | 4e14dfc | 2009-08-07 16:11:19 +0100 | [diff] [blame] | 65 | |
| 66 | print_ftrace_graph_addr(addr, data, ops, |
| 67 | context, &graph); |
| 68 | } |
| 69 | } |
| 70 | } |
Matt Fleming | 4e14dfc | 2009-08-07 16:11:19 +0100 | [diff] [blame] | 71 | |
| 72 | static void |
| 73 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) |
| 74 | { |
| 75 | printk(data); |
| 76 | print_symbol(msg, symbol); |
| 77 | printk("\n"); |
| 78 | } |
| 79 | |
| 80 | static void print_trace_warning(void *data, char *msg) |
| 81 | { |
| 82 | printk("%s%s\n", (char *)data, msg); |
| 83 | } |
| 84 | |
| 85 | static int print_trace_stack(void *data, char *name) |
| 86 | { |
| 87 | printk("%s <%s> ", (char *)data, name); |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * Print one address/symbol entries per line. |
| 93 | */ |
| 94 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
| 95 | { |
| 96 | printk(data); |
| 97 | printk_address(addr, reliable); |
| 98 | } |
| 99 | |
| 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, |
| 105 | }; |
| 106 | |
| 107 | void show_trace(struct task_struct *tsk, unsigned long *sp, |
| 108 | struct pt_regs *regs) |
| 109 | { |
| 110 | if (regs && user_mode(regs)) |
| 111 | return; |
| 112 | |
| 113 | printk("\nCall trace:\n"); |
| 114 | |
Matt Fleming | 0eff9f6 | 2009-08-11 22:43:20 +0100 | [diff] [blame] | 115 | unwind_stack(tsk, regs, sp, &print_trace_ops, ""); |
Matt Fleming | 4e14dfc | 2009-08-07 16:11:19 +0100 | [diff] [blame] | 116 | |
| 117 | printk("\n"); |
| 118 | |
| 119 | if (!tsk) |
| 120 | tsk = current; |
| 121 | |
| 122 | debug_show_held_locks(tsk); |
| 123 | } |