blob: eaaaf805f31b6d32039376df4f0e9ffdec777b5d [file] [log] [blame]
Michal Simek65bc6092009-03-27 14:25:29 +01001/*
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
20void trap_init(void)
21{
22 __enable_hw_exceptions();
23}
24
Michal Simek65bc6092009-03-27 14:25:29 +010025static int kstack_depth_to_print = 24;
26
27static int __init kstack_setup(char *s)
28{
Michal Simekbf7e9da2009-04-16 11:10:07 +020029 kstack_depth_to_print = strict_strtoul(s, 0, NULL);
Michal Simek65bc6092009-03-27 14:25:29 +010030
31 return 1;
32}
33__setup("kstack=", kstack_setup);
34
35void 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
67void 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
95void dump_stack(void)
96{
97 show_stack(NULL, NULL);
98}
99EXPORT_SYMBOL(dump_stack);
Michal Simek17f33242009-05-26 16:30:27 +0200100
101#ifdef CONFIG_MMU
102void __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
113int 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
121int 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