Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
| 4 | */ |
| 5 | #include <linux/kallsyms.h> |
| 6 | #include <linux/kprobes.h> |
| 7 | #include <linux/uaccess.h> |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 8 | #include <linux/hardirq.h> |
| 9 | #include <linux/kdebug.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/ptrace.h> |
| 12 | #include <linux/kexec.h> |
Ingo Molnar | b803090 | 2009-11-26 08:17:31 +0100 | [diff] [blame] | 13 | #include <linux/sysfs.h> |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 14 | #include <linux/bug.h> |
| 15 | #include <linux/nmi.h> |
| 16 | |
| 17 | #include <asm/stacktrace.h> |
| 18 | |
Frederic Weisbecker | 0406ca6 | 2009-07-01 21:02:09 +0200 | [diff] [blame] | 19 | |
Namhyung Kim | e8e999cf | 2011-03-18 11:40:06 +0900 | [diff] [blame] | 20 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
| 21 | unsigned long *stack, unsigned long bp, |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 22 | const struct stacktrace_ops *ops, void *data) |
| 23 | { |
Steven Rostedt | 7ee991f | 2008-12-02 23:50:04 -0500 | [diff] [blame] | 24 | int graph = 0; |
| 25 | |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 26 | if (!task) |
| 27 | task = current; |
| 28 | |
| 29 | if (!stack) { |
| 30 | unsigned long dummy; |
Ingo Molnar | b803090 | 2009-11-26 08:17:31 +0100 | [diff] [blame] | 31 | |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 32 | stack = &dummy; |
Alexander van Heukelum | 8a54166 | 2008-10-04 23:12:46 +0200 | [diff] [blame] | 33 | if (task && task != current) |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 34 | stack = (unsigned long *)task->thread.sp; |
| 35 | } |
| 36 | |
Namhyung Kim | e8e999cf | 2011-03-18 11:40:06 +0900 | [diff] [blame] | 37 | if (!bp) |
| 38 | bp = stack_frame(task, regs); |
| 39 | |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 40 | for (;;) { |
| 41 | struct thread_info *context; |
| 42 | |
| 43 | context = (struct thread_info *) |
| 44 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); |
Frederic Weisbecker | 61c1917 | 2009-12-17 05:40:33 +0100 | [diff] [blame] | 45 | bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph); |
Alexander van Heukelum | 2ac5372 | 2008-10-04 23:12:43 +0200 | [diff] [blame] | 46 | |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 47 | stack = (unsigned long *)context->previous_esp; |
| 48 | if (!stack) |
| 49 | break; |
Alexander van Heukelum | 2ac5372 | 2008-10-04 23:12:43 +0200 | [diff] [blame] | 50 | if (ops->stack(data, "IRQ") < 0) |
| 51 | break; |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 52 | touch_nmi_watchdog(); |
| 53 | } |
| 54 | } |
| 55 | EXPORT_SYMBOL(dump_trace); |
| 56 | |
Neil Horman | 878719e | 2008-10-23 10:40:06 -0400 | [diff] [blame] | 57 | void |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 58 | show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
Namhyung Kim | e8e999cf | 2011-03-18 11:40:06 +0900 | [diff] [blame] | 59 | unsigned long *sp, unsigned long bp, char *log_lvl) |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 60 | { |
| 61 | unsigned long *stack; |
| 62 | int i; |
| 63 | |
| 64 | if (sp == NULL) { |
| 65 | if (task) |
| 66 | sp = (unsigned long *)task->thread.sp; |
| 67 | else |
| 68 | sp = (unsigned long *)&sp; |
| 69 | } |
| 70 | |
| 71 | stack = sp; |
| 72 | for (i = 0; i < kstack_depth_to_print; i++) { |
| 73 | if (kstack_end(stack)) |
| 74 | break; |
Alexander van Heukelum | 8a54166 | 2008-10-04 23:12:46 +0200 | [diff] [blame] | 75 | if (i && ((i % STACKSLOTS_PER_LINE) == 0)) |
Jiri Slaby | e4072a9 | 2010-10-20 16:48:51 +0200 | [diff] [blame] | 76 | printk(KERN_CONT "\n"); |
| 77 | printk(KERN_CONT " %08lx", *stack++); |
Alexander van Heukelum | ca0a816 | 2008-10-04 23:12:44 +0200 | [diff] [blame] | 78 | touch_nmi_watchdog(); |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 79 | } |
Jiri Slaby | e4072a9 | 2010-10-20 16:48:51 +0200 | [diff] [blame] | 80 | printk(KERN_CONT "\n"); |
Namhyung Kim | e8e999cf | 2011-03-18 11:40:06 +0900 | [diff] [blame] | 81 | show_trace_log_lvl(task, regs, sp, bp, log_lvl); |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 82 | } |
| 83 | |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 84 | |
| 85 | void show_registers(struct pt_regs *regs) |
| 86 | { |
| 87 | int i; |
| 88 | |
| 89 | print_modules(); |
| 90 | __show_regs(regs, 0); |
| 91 | |
Alexander van Heukelum | ca0a816 | 2008-10-04 23:12:44 +0200 | [diff] [blame] | 92 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n", |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 93 | TASK_COMM_LEN, current->comm, task_pid_nr(current), |
| 94 | current_thread_info(), current, task_thread_info(current)); |
| 95 | /* |
| 96 | * When in-kernel, we also print out the stack and code at the |
| 97 | * time of the fault.. |
| 98 | */ |
| 99 | if (!user_mode_vm(regs)) { |
| 100 | unsigned int code_prologue = code_bytes * 43 / 64; |
| 101 | unsigned int code_len = code_bytes; |
| 102 | unsigned char c; |
| 103 | u8 *ip; |
| 104 | |
Alexander van Heukelum | ca0a816 | 2008-10-04 23:12:44 +0200 | [diff] [blame] | 105 | printk(KERN_EMERG "Stack:\n"); |
Namhyung Kim | e8e999cf | 2011-03-18 11:40:06 +0900 | [diff] [blame] | 106 | show_stack_log_lvl(NULL, regs, ®s->sp, 0, KERN_EMERG); |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 107 | |
| 108 | printk(KERN_EMERG "Code: "); |
| 109 | |
| 110 | ip = (u8 *)regs->ip - code_prologue; |
| 111 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { |
Alexander van Heukelum | 8a54166 | 2008-10-04 23:12:46 +0200 | [diff] [blame] | 112 | /* try starting at IP */ |
Alexander van Heukelum | 2bc5f92 | 2008-09-30 13:12:14 +0200 | [diff] [blame] | 113 | ip = (u8 *)regs->ip; |
| 114 | code_len = code_len - code_prologue + 1; |
| 115 | } |
| 116 | for (i = 0; i < code_len; i++, ip++) { |
| 117 | if (ip < (u8 *)PAGE_OFFSET || |
| 118 | probe_kernel_address(ip, c)) { |
| 119 | printk(" Bad EIP value."); |
| 120 | break; |
| 121 | } |
| 122 | if (ip == (u8 *)regs->ip) |
| 123 | printk("<%02x> ", c); |
| 124 | else |
| 125 | printk("%02x ", c); |
| 126 | } |
| 127 | } |
| 128 | printk("\n"); |
| 129 | } |
| 130 | |
| 131 | int is_valid_bugaddr(unsigned long ip) |
| 132 | { |
| 133 | unsigned short ud2; |
| 134 | |
| 135 | if (ip < PAGE_OFFSET) |
| 136 | return 0; |
| 137 | if (probe_kernel_address((unsigned short *)ip, ud2)) |
| 138 | return 0; |
| 139 | |
| 140 | return ud2 == 0x0b0f; |
| 141 | } |