Michal Simek | 65bc609 | 2009-03-27 14:25:29 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> |
| 3 | * Copyright (C) 2007-2009 PetaLogix |
| 4 | * Copyright (C) 2006 Atmark Techno, Inc. |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file "COPYING" in the main directory of this archive |
| 8 | * for more details. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/kallsyms.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/debug_locks.h> |
| 16 | |
| 17 | #include <asm/exceptions.h> |
| 18 | #include <asm/system.h> |
| 19 | |
| 20 | void trap_init(void) |
| 21 | { |
| 22 | __enable_hw_exceptions(); |
| 23 | } |
| 24 | |
Michal Simek | 65bc609 | 2009-03-27 14:25:29 +0100 | [diff] [blame] | 25 | static int kstack_depth_to_print = 24; |
| 26 | |
| 27 | static int __init kstack_setup(char *s) |
| 28 | { |
Michal Simek | bf7e9da | 2009-04-16 11:10:07 +0200 | [diff] [blame] | 29 | kstack_depth_to_print = strict_strtoul(s, 0, NULL); |
Michal Simek | 65bc609 | 2009-03-27 14:25:29 +0100 | [diff] [blame] | 30 | |
| 31 | return 1; |
| 32 | } |
| 33 | __setup("kstack=", kstack_setup); |
| 34 | |
| 35 | void show_trace(struct task_struct *task, unsigned long *stack) |
| 36 | { |
| 37 | unsigned long addr; |
| 38 | |
| 39 | if (!stack) |
| 40 | stack = (unsigned long *)&stack; |
| 41 | |
| 42 | printk(KERN_NOTICE "Call Trace: "); |
| 43 | #ifdef CONFIG_KALLSYMS |
| 44 | printk(KERN_NOTICE "\n"); |
| 45 | #endif |
| 46 | while (!kstack_end(stack)) { |
| 47 | addr = *stack++; |
| 48 | /* |
| 49 | * If the address is either in the text segment of the |
| 50 | * kernel, or in the region which contains vmalloc'ed |
| 51 | * memory, it *may* be the address of a calling |
| 52 | * routine; if so, print it so that someone tracing |
| 53 | * down the cause of the crash will be able to figure |
| 54 | * out the call path that was taken. |
| 55 | */ |
| 56 | if (kernel_text_address(addr)) |
| 57 | print_ip_sym(addr); |
| 58 | } |
| 59 | printk(KERN_NOTICE "\n"); |
| 60 | |
| 61 | if (!task) |
| 62 | task = current; |
| 63 | |
| 64 | debug_show_held_locks(task); |
| 65 | } |
| 66 | |
| 67 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 68 | { |
| 69 | unsigned long *stack; |
| 70 | int i; |
| 71 | |
| 72 | if (sp == NULL) { |
| 73 | if (task) |
| 74 | sp = (unsigned long *) ((struct thread_info *) |
| 75 | (task->stack))->cpu_context.r1; |
| 76 | else |
| 77 | sp = (unsigned long *)&sp; |
| 78 | } |
| 79 | |
| 80 | stack = sp; |
| 81 | |
| 82 | printk(KERN_INFO "\nStack:\n "); |
| 83 | |
| 84 | for (i = 0; i < kstack_depth_to_print; i++) { |
| 85 | if (kstack_end(sp)) |
| 86 | break; |
| 87 | if (i && ((i % 8) == 0)) |
| 88 | printk("\n "); |
| 89 | printk("%08lx ", *sp++); |
| 90 | } |
| 91 | printk("\n"); |
| 92 | show_trace(task, stack); |
| 93 | } |
| 94 | |
| 95 | void dump_stack(void) |
| 96 | { |
| 97 | show_stack(NULL, NULL); |
| 98 | } |
| 99 | EXPORT_SYMBOL(dump_stack); |
Michal Simek | 17f3324 | 2009-05-26 16:30:27 +0200 | [diff] [blame] | 100 | |
| 101 | #ifdef CONFIG_MMU |
| 102 | void __bug(const char *file, int line, void *data) |
| 103 | { |
| 104 | if (data) |
| 105 | printk(KERN_CRIT "kernel BUG at %s:%d (data = %p)!\n", |
| 106 | file, line, data); |
| 107 | else |
| 108 | printk(KERN_CRIT "kernel BUG at %s:%d!\n", file, line); |
| 109 | |
| 110 | machine_halt(); |
| 111 | } |
| 112 | |
| 113 | int bad_trap(int trap_num, struct pt_regs *regs) |
| 114 | { |
| 115 | printk(KERN_CRIT |
| 116 | "unimplemented trap %d called at 0x%08lx, pid %d!\n", |
| 117 | trap_num, regs->pc, current->pid); |
| 118 | return -ENOSYS; |
| 119 | } |
| 120 | |
| 121 | int debug_trap(struct pt_regs *regs) |
| 122 | { |
| 123 | int i; |
| 124 | printk(KERN_CRIT "debug trap\n"); |
| 125 | for (i = 0; i < 32; i++) { |
| 126 | /* printk("r%i:%08X\t",i,regs->gpr[i]); */ |
| 127 | if ((i % 4) == 3) |
| 128 | printk(KERN_CRIT "\n"); |
| 129 | } |
| 130 | printk(KERN_CRIT "pc:%08lX\tmsr:%08lX\n", regs->pc, regs->msr); |
| 131 | return -ENOSYS; |
| 132 | } |
| 133 | #endif |