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Commit | Line | Data |
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1ddba025 | 1 | /* |
1da177e4 LT |
2 | * linux/arch/cris/traps.c |
3 | * | |
1ddba025 JN |
4 | * Here we handle the break vectors not used by the system call |
5 | * mechanism, as well as some general stack/register dumping | |
1da177e4 | 6 | * things. |
1ddba025 JN |
7 | * |
8 | * Copyright (C) 2000-2007 Axis Communications AB | |
1da177e4 LT |
9 | * |
10 | * Authors: Bjorn Wesen | |
1ddba025 | 11 | * Hans-Peter Nilsson |
1da177e4 LT |
12 | * |
13 | */ | |
14 | ||
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
1ddba025 | 17 | |
1da177e4 LT |
18 | #include <asm/pgtable.h> |
19 | #include <asm/uaccess.h> | |
20 | ||
1ddba025 JN |
21 | extern void arch_enable_nmi(void); |
22 | extern void stop_watchdog(void); | |
23 | extern void reset_watchdog(void); | |
24 | extern void show_registers(struct pt_regs *regs); | |
25 | ||
26 | #ifdef CONFIG_DEBUG_BUGVERBOSE | |
27 | extern void handle_BUG(struct pt_regs *regs); | |
28 | #else | |
29 | #define handle_BUG(regs) | |
30 | #endif | |
31 | ||
1da177e4 LT |
32 | static int kstack_depth_to_print = 24; |
33 | ||
1ddba025 | 34 | void (*nmi_handler)(struct pt_regs *); |
059163ca | 35 | |
1ddba025 JN |
36 | void |
37 | show_trace(unsigned long *stack) | |
1da177e4 LT |
38 | { |
39 | unsigned long addr, module_start, module_end; | |
40 | extern char _stext, _etext; | |
41 | int i; | |
42 | ||
1ddba025 | 43 | printk("\nCall Trace: "); |
1da177e4 | 44 | |
1ddba025 JN |
45 | i = 1; |
46 | module_start = VMALLOC_START; | |
47 | module_end = VMALLOC_END; | |
1da177e4 | 48 | |
1ddba025 JN |
49 | while (((long)stack & (THREAD_SIZE-1)) != 0) { |
50 | if (__get_user(addr, stack)) { | |
1da177e4 LT |
51 | /* This message matches "failing address" marked |
52 | s390 in ksymoops, so lines containing it will | |
53 | not be filtered out by ksymoops. */ | |
1ddba025 | 54 | printk("Failing address 0x%lx\n", (unsigned long)stack); |
1da177e4 LT |
55 | break; |
56 | } | |
57 | stack++; | |
58 | ||
1ddba025 JN |
59 | /* |
60 | * If the address is either in the text segment of the | |
61 | * kernel, or in the region which contains vmalloc'ed | |
62 | * memory, it *may* be the address of a calling | |
63 | * routine; if so, print it so that someone tracing | |
64 | * down the cause of the crash will be able to figure | |
65 | * out the call path that was taken. | |
66 | */ | |
67 | if (((addr >= (unsigned long)&_stext) && | |
68 | (addr <= (unsigned long)&_etext)) || | |
69 | ((addr >= module_start) && (addr <= module_end))) { | |
70 | if (i && ((i % 8) == 0)) | |
71 | printk("\n "); | |
72 | printk("[<%08lx>] ", addr); | |
73 | i++; | |
74 | } | |
75 | } | |
1da177e4 LT |
76 | } |
77 | ||
78 | /* | |
79 | * These constants are for searching for possible module text | |
80 | * segments. MODULE_RANGE is a guess of how much space is likely | |
81 | * to be vmalloced. | |
82 | */ | |
83 | ||
84 | #define MODULE_RANGE (8*1024*1024) | |
85 | ||
86 | /* | |
87 | * The output (format, strings and order) is adjusted to be usable with | |
88 | * ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't | |
89 | * change it unless you're serious about adjusting ksymoops and syncing | |
90 | * with the ksymoops maintainer. | |
91 | */ | |
92 | ||
1ddba025 | 93 | void |
1da177e4 LT |
94 | show_stack(struct task_struct *task, unsigned long *sp) |
95 | { | |
1ddba025 JN |
96 | unsigned long *stack, addr; |
97 | int i; | |
1da177e4 LT |
98 | |
99 | /* | |
100 | * debugging aid: "show_stack(NULL);" prints a | |
101 | * back trace. | |
102 | */ | |
103 | ||
1ddba025 | 104 | if (sp == NULL) { |
1da177e4 LT |
105 | if (task) |
106 | sp = (unsigned long*)task->thread.ksp; | |
107 | else | |
108 | sp = (unsigned long*)rdsp(); | |
109 | } | |
110 | ||
1ddba025 | 111 | stack = sp; |
1da177e4 | 112 | |
1ddba025 JN |
113 | printk("\nStack from %08lx:\n ", (unsigned long)stack); |
114 | for (i = 0; i < kstack_depth_to_print; i++) { | |
115 | if (((long)stack & (THREAD_SIZE-1)) == 0) | |
116 | break; | |
117 | if (i && ((i % 8) == 0)) | |
118 | printk("\n "); | |
119 | if (__get_user(addr, stack)) { | |
1da177e4 LT |
120 | /* This message matches "failing address" marked |
121 | s390 in ksymoops, so lines containing it will | |
122 | not be filtered out by ksymoops. */ | |
1ddba025 | 123 | printk("Failing address 0x%lx\n", (unsigned long)stack); |
1da177e4 LT |
124 | break; |
125 | } | |
126 | stack++; | |
1ddba025 JN |
127 | printk("%08lx ", addr); |
128 | } | |
1da177e4 LT |
129 | show_trace(sp); |
130 | } | |
131 | ||
1ddba025 JN |
132 | #if 0 |
133 | /* displays a short stack trace */ | |
059163ca | 134 | |
1ddba025 JN |
135 | int |
136 | show_stack(void) | |
059163ca | 137 | { |
1ddba025 JN |
138 | unsigned long *sp = (unsigned long *)rdusp(); |
139 | int i; | |
140 | ||
141 | printk("Stack dump [0x%08lx]:\n", (unsigned long)sp); | |
142 | for (i = 0; i < 16; i++) | |
143 | printk("sp + %d: 0x%08lx\n", i*4, sp[i]); | |
144 | return 0; | |
059163ca | 145 | } |
1ddba025 | 146 | #endif |
059163ca | 147 | |
1ddba025 JN |
148 | void |
149 | dump_stack(void) | |
059163ca | 150 | { |
1ddba025 JN |
151 | show_stack(NULL, NULL); |
152 | } | |
153 | EXPORT_SYMBOL(dump_stack); | |
154 | ||
155 | void | |
156 | set_nmi_handler(void (*handler)(struct pt_regs *)) | |
157 | { | |
158 | nmi_handler = handler; | |
159 | arch_enable_nmi(); | |
059163ca MS |
160 | } |
161 | ||
162 | #ifdef CONFIG_DEBUG_NMI_OOPS | |
1ddba025 JN |
163 | void |
164 | oops_nmi_handler(struct pt_regs *regs) | |
059163ca | 165 | { |
1ddba025 JN |
166 | stop_watchdog(); |
167 | oops_in_progress = 1; | |
168 | printk("NMI!\n"); | |
169 | show_registers(regs); | |
170 | oops_in_progress = 0; | |
059163ca MS |
171 | } |
172 | ||
1ddba025 JN |
173 | static int __init |
174 | oops_nmi_register(void) | |
059163ca | 175 | { |
1ddba025 JN |
176 | set_nmi_handler(oops_nmi_handler); |
177 | return 0; | |
059163ca MS |
178 | } |
179 | ||
180 | __initcall(oops_nmi_register); | |
181 | ||
182 | #endif | |
183 | ||
1ddba025 JN |
184 | /* |
185 | * This gets called from entry.S when the watchdog has bitten. Show something | |
186 | * similiar to an Oops dump, and if the kernel is configured to be a nice | |
187 | * doggy, then halt instead of reboot. | |
188 | */ | |
189 | void | |
190 | watchdog_bite_hook(struct pt_regs *regs) | |
1da177e4 | 191 | { |
1ddba025 JN |
192 | #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY |
193 | local_irq_disable(); | |
194 | stop_watchdog(); | |
195 | show_registers(regs); | |
196 | ||
197 | while (1) | |
198 | ; /* Do nothing. */ | |
199 | #else | |
200 | show_registers(regs); | |
1da177e4 | 201 | #endif |
1ddba025 | 202 | } |
1da177e4 | 203 | |
1ddba025 JN |
204 | /* This is normally the Oops function. */ |
205 | void | |
206 | die_if_kernel(const char *str, struct pt_regs *regs, long err) | |
1da177e4 | 207 | { |
1ddba025 JN |
208 | if (user_mode(regs)) |
209 | return; | |
1da177e4 | 210 | |
1ddba025 JN |
211 | #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY |
212 | /* | |
213 | * This printout might take too long and could trigger | |
214 | * the watchdog normally. If NICE_DOGGY is set, simply | |
215 | * stop the watchdog during the printout. | |
216 | */ | |
217 | stop_watchdog(); | |
218 | #endif | |
1da177e4 | 219 | |
1ddba025 JN |
220 | handle_BUG(regs); |
221 | ||
222 | printk("%s: %04lx\n", str, err & 0xffff); | |
223 | ||
224 | show_registers(regs); | |
225 | ||
226 | oops_in_progress = 0; | |
227 | ||
228 | #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY | |
229 | reset_watchdog(); | |
230 | #endif | |
231 | do_exit(SIGSEGV); | |
1da177e4 | 232 | } |
059163ca | 233 | |
1ddba025 JN |
234 | void __init |
235 | trap_init(void) | |
059163ca | 236 | { |
1ddba025 | 237 | /* Nothing needs to be done */ |
059163ca | 238 | } |