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1da177e4 LT |
1 | /* $Id: traps.c,v 1.9 2004/05/11 12:28:26 starvik Exp $ |
2 | * | |
3 | * linux/arch/cris/traps.c | |
4 | * | |
5 | * Here we handle the break vectors not used by the system call | |
6 | * mechanism, as well as some general stack/register dumping | |
7 | * things. | |
8 | * | |
9 | * Copyright (C) 2000-2002 Axis Communications AB | |
10 | * | |
11 | * Authors: Bjorn Wesen | |
12 | * Hans-Peter Nilsson | |
13 | * | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <asm/pgtable.h> | |
19 | #include <asm/uaccess.h> | |
20 | ||
21 | static int kstack_depth_to_print = 24; | |
22 | ||
23 | void show_trace(unsigned long * stack) | |
24 | { | |
25 | unsigned long addr, module_start, module_end; | |
26 | extern char _stext, _etext; | |
27 | int i; | |
28 | ||
29 | printk("\nCall Trace: "); | |
30 | ||
31 | i = 1; | |
32 | module_start = VMALLOC_START; | |
33 | module_end = VMALLOC_END; | |
34 | ||
35 | while (((long) stack & (THREAD_SIZE-1)) != 0) { | |
36 | if (__get_user (addr, stack)) { | |
37 | /* This message matches "failing address" marked | |
38 | s390 in ksymoops, so lines containing it will | |
39 | not be filtered out by ksymoops. */ | |
40 | printk ("Failing address 0x%lx\n", (unsigned long)stack); | |
41 | break; | |
42 | } | |
43 | stack++; | |
44 | ||
45 | /* | |
46 | * If the address is either in the text segment of the | |
47 | * kernel, or in the region which contains vmalloc'ed | |
48 | * memory, it *may* be the address of a calling | |
49 | * routine; if so, print it so that someone tracing | |
50 | * down the cause of the crash will be able to figure | |
51 | * out the call path that was taken. | |
52 | */ | |
53 | if (((addr >= (unsigned long) &_stext) && | |
54 | (addr <= (unsigned long) &_etext)) || | |
55 | ((addr >= module_start) && (addr <= module_end))) { | |
56 | if (i && ((i % 8) == 0)) | |
57 | printk("\n "); | |
58 | printk("[<%08lx>] ", addr); | |
59 | i++; | |
60 | } | |
61 | } | |
62 | } | |
63 | ||
64 | /* | |
65 | * These constants are for searching for possible module text | |
66 | * segments. MODULE_RANGE is a guess of how much space is likely | |
67 | * to be vmalloced. | |
68 | */ | |
69 | ||
70 | #define MODULE_RANGE (8*1024*1024) | |
71 | ||
72 | /* | |
73 | * The output (format, strings and order) is adjusted to be usable with | |
74 | * ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't | |
75 | * change it unless you're serious about adjusting ksymoops and syncing | |
76 | * with the ksymoops maintainer. | |
77 | */ | |
78 | ||
79 | void | |
80 | show_stack(struct task_struct *task, unsigned long *sp) | |
81 | { | |
82 | unsigned long *stack, addr; | |
83 | int i; | |
84 | ||
85 | /* | |
86 | * debugging aid: "show_stack(NULL);" prints a | |
87 | * back trace. | |
88 | */ | |
89 | ||
90 | if(sp == NULL) { | |
91 | if (task) | |
92 | sp = (unsigned long*)task->thread.ksp; | |
93 | else | |
94 | sp = (unsigned long*)rdsp(); | |
95 | } | |
96 | ||
97 | stack = sp; | |
98 | ||
99 | printk("\nStack from %08lx:\n ", (unsigned long)stack); | |
100 | for(i = 0; i < kstack_depth_to_print; i++) { | |
101 | if (((long) stack & (THREAD_SIZE-1)) == 0) | |
102 | break; | |
103 | if (i && ((i % 8) == 0)) | |
104 | printk("\n "); | |
105 | if (__get_user (addr, stack)) { | |
106 | /* This message matches "failing address" marked | |
107 | s390 in ksymoops, so lines containing it will | |
108 | not be filtered out by ksymoops. */ | |
109 | printk ("Failing address 0x%lx\n", (unsigned long)stack); | |
110 | break; | |
111 | } | |
112 | stack++; | |
113 | printk("%08lx ", addr); | |
114 | } | |
115 | show_trace(sp); | |
116 | } | |
117 | ||
118 | #if 0 | |
119 | /* displays a short stack trace */ | |
120 | ||
121 | int | |
122 | show_stack() | |
123 | { | |
124 | unsigned long *sp = (unsigned long *)rdusp(); | |
125 | int i; | |
126 | printk("Stack dump [0x%08lx]:\n", (unsigned long)sp); | |
127 | for(i = 0; i < 16; i++) | |
128 | printk("sp + %d: 0x%08lx\n", i*4, sp[i]); | |
129 | return 0; | |
130 | } | |
131 | #endif | |
132 | ||
133 | void dump_stack(void) | |
134 | { | |
135 | show_stack(NULL, NULL); | |
136 | } | |
137 | ||
138 | EXPORT_SYMBOL(dump_stack); | |
139 | ||
140 | void __init | |
141 | trap_init(void) | |
142 | { | |
143 | /* Nothing needs to be done */ | |
144 | } |