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769a8a96 JB |
1 | /* |
2 | * OpenRISC traps.c | |
3 | * | |
4 | * Linux architectural port borrowing liberally from similar works of | |
5 | * others. All original copyrights apply as per the original source | |
6 | * declaration. | |
7 | * | |
8 | * Modifications for the OpenRISC architecture: | |
9 | * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> | |
10 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or | |
13 | * modify it under the terms of the GNU General Public License | |
14 | * as published by the Free Software Foundation; either version | |
15 | * 2 of the License, or (at your option) any later version. | |
16 | * | |
17 | * Here we handle the break vectors not used by the system call | |
18 | * mechanism, as well as some general stack/register dumping | |
19 | * things. | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/init.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/kmod.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/errno.h> | |
30 | #include <linux/ptrace.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/mm.h> | |
33 | #include <linux/kallsyms.h> | |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
769a8a96 | 35 | |
769a8a96 JB |
36 | #include <asm/segment.h> |
37 | #include <asm/io.h> | |
38 | #include <asm/pgtable.h> | |
39 | ||
40 | extern char _etext, _stext; | |
41 | ||
42 | int kstack_depth_to_print = 0x180; | |
43 | ||
44 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) | |
45 | { | |
46 | return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3; | |
47 | } | |
48 | ||
49 | void show_trace(struct task_struct *task, unsigned long *stack) | |
50 | { | |
51 | struct thread_info *context; | |
52 | unsigned long addr; | |
53 | ||
54 | context = (struct thread_info *) | |
55 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); | |
56 | ||
57 | while (valid_stack_ptr(context, stack)) { | |
58 | addr = *stack++; | |
59 | if (__kernel_text_address(addr)) { | |
60 | printk(" [<%08lx>]", addr); | |
61 | print_symbol(" %s", addr); | |
62 | printk("\n"); | |
63 | } | |
64 | } | |
65 | printk(" =======================\n"); | |
66 | } | |
67 | ||
68 | /* displays a short stack trace */ | |
69 | void show_stack(struct task_struct *task, unsigned long *esp) | |
70 | { | |
71 | unsigned long addr, *stack; | |
72 | int i; | |
73 | ||
74 | if (esp == NULL) | |
75 | esp = (unsigned long *)&esp; | |
76 | ||
77 | stack = esp; | |
78 | ||
79 | printk("Stack dump [0x%08lx]:\n", (unsigned long)esp); | |
80 | for (i = 0; i < kstack_depth_to_print; i++) { | |
81 | if (kstack_end(stack)) | |
82 | break; | |
83 | if (__get_user(addr, stack)) { | |
84 | /* This message matches "failing address" marked | |
85 | s390 in ksymoops, so lines containing it will | |
86 | not be filtered out by ksymoops. */ | |
87 | printk("Failing address 0x%lx\n", (unsigned long)stack); | |
88 | break; | |
89 | } | |
90 | stack++; | |
91 | ||
92 | printk("sp + %02d: 0x%08lx\n", i * 4, addr); | |
93 | } | |
94 | printk("\n"); | |
95 | ||
96 | show_trace(task, esp); | |
97 | ||
98 | return; | |
99 | } | |
100 | ||
101 | void show_trace_task(struct task_struct *tsk) | |
102 | { | |
103 | /* | |
104 | * TODO: SysRq-T trace dump... | |
105 | */ | |
106 | } | |
107 | ||
769a8a96 JB |
108 | void show_registers(struct pt_regs *regs) |
109 | { | |
110 | int i; | |
111 | int in_kernel = 1; | |
112 | unsigned long esp; | |
113 | ||
114 | esp = (unsigned long)(®s->sp); | |
115 | if (user_mode(regs)) | |
116 | in_kernel = 0; | |
117 | ||
118 | printk("CPU #: %d\n" | |
119 | " PC: %08lx SR: %08lx SP: %08lx\n", | |
120 | smp_processor_id(), regs->pc, regs->sr, regs->sp); | |
121 | printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", | |
122 | 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); | |
123 | printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", | |
124 | regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); | |
125 | printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", | |
126 | regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); | |
127 | printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", | |
128 | regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); | |
129 | printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", | |
130 | regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); | |
131 | printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", | |
132 | regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); | |
133 | printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", | |
134 | regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); | |
135 | printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", | |
136 | regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); | |
6cbe5e95 JB |
137 | printk(" RES: %08lx oGPR11: %08lx\n", |
138 | regs->gpr[11], regs->orig_gpr11); | |
769a8a96 JB |
139 | |
140 | printk("Process %s (pid: %d, stackpage=%08lx)\n", | |
141 | current->comm, current->pid, (unsigned long)current); | |
142 | /* | |
143 | * When in-kernel, we also print out the stack and code at the | |
144 | * time of the fault.. | |
145 | */ | |
146 | if (in_kernel) { | |
147 | ||
148 | printk("\nStack: "); | |
149 | show_stack(NULL, (unsigned long *)esp); | |
150 | ||
151 | printk("\nCode: "); | |
152 | if (regs->pc < PAGE_OFFSET) | |
153 | goto bad; | |
154 | ||
155 | for (i = -24; i < 24; i++) { | |
156 | unsigned char c; | |
157 | if (__get_user(c, &((unsigned char *)regs->pc)[i])) { | |
158 | bad: | |
159 | printk(" Bad PC value."); | |
160 | break; | |
161 | } | |
162 | ||
163 | if (i == 0) | |
164 | printk("(%02x) ", c); | |
165 | else | |
166 | printk("%02x ", c); | |
167 | } | |
168 | } | |
169 | printk("\n"); | |
170 | } | |
171 | ||
172 | void nommu_dump_state(struct pt_regs *regs, | |
173 | unsigned long ea, unsigned long vector) | |
174 | { | |
175 | int i; | |
176 | unsigned long addr, stack = regs->sp; | |
177 | ||
178 | printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector); | |
179 | ||
180 | printk("CPU #: %d\n" | |
181 | " PC: %08lx SR: %08lx SP: %08lx\n", | |
182 | 0, regs->pc, regs->sr, regs->sp); | |
183 | printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n", | |
184 | 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]); | |
185 | printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n", | |
186 | regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]); | |
187 | printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n", | |
188 | regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]); | |
189 | printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n", | |
190 | regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]); | |
191 | printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n", | |
192 | regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]); | |
193 | printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n", | |
194 | regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]); | |
195 | printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n", | |
196 | regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]); | |
197 | printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n", | |
198 | regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]); | |
6cbe5e95 JB |
199 | printk(" RES: %08lx oGPR11: %08lx\n", |
200 | regs->gpr[11], regs->orig_gpr11); | |
769a8a96 JB |
201 | |
202 | printk("Process %s (pid: %d, stackpage=%08lx)\n", | |
203 | ((struct task_struct *)(__pa(current)))->comm, | |
204 | ((struct task_struct *)(__pa(current)))->pid, | |
205 | (unsigned long)current); | |
206 | ||
207 | printk("\nStack: "); | |
208 | printk("Stack dump [0x%08lx]:\n", (unsigned long)stack); | |
209 | for (i = 0; i < kstack_depth_to_print; i++) { | |
210 | if (((long)stack & (THREAD_SIZE - 1)) == 0) | |
211 | break; | |
212 | stack++; | |
213 | ||
214 | printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4, | |
215 | *((unsigned long *)(__pa(stack)))); | |
216 | } | |
217 | printk("\n"); | |
218 | ||
219 | printk("Call Trace: "); | |
220 | i = 1; | |
221 | while (((long)stack & (THREAD_SIZE - 1)) != 0) { | |
222 | addr = *((unsigned long *)__pa(stack)); | |
223 | stack++; | |
224 | ||
225 | if (kernel_text_address(addr)) { | |
226 | if (i && ((i % 6) == 0)) | |
227 | printk("\n "); | |
228 | printk(" [<%08lx>]", addr); | |
229 | i++; | |
230 | } | |
231 | } | |
232 | printk("\n"); | |
233 | ||
234 | printk("\nCode: "); | |
235 | ||
236 | for (i = -24; i < 24; i++) { | |
237 | unsigned char c; | |
238 | c = ((unsigned char *)(__pa(regs->pc)))[i]; | |
239 | ||
240 | if (i == 0) | |
241 | printk("(%02x) ", c); | |
242 | else | |
243 | printk("%02x ", c); | |
244 | } | |
245 | printk("\n"); | |
246 | } | |
247 | ||
248 | /* This is normally the 'Oops' routine */ | |
249 | void die(const char *str, struct pt_regs *regs, long err) | |
250 | { | |
251 | ||
252 | console_verbose(); | |
253 | printk("\n%s#: %04lx\n", str, err & 0xffff); | |
254 | show_registers(regs); | |
255 | #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION | |
256 | printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n"); | |
257 | ||
258 | /* shut down interrupts */ | |
259 | local_irq_disable(); | |
260 | ||
261 | __asm__ __volatile__("l.nop 1"); | |
262 | do {} while (1); | |
263 | #endif | |
264 | do_exit(SIGSEGV); | |
265 | } | |
266 | ||
267 | /* This is normally the 'Oops' routine */ | |
268 | void die_if_kernel(const char *str, struct pt_regs *regs, long err) | |
269 | { | |
270 | if (user_mode(regs)) | |
271 | return; | |
272 | ||
273 | die(str, regs, err); | |
274 | } | |
275 | ||
276 | void unhandled_exception(struct pt_regs *regs, int ea, int vector) | |
277 | { | |
278 | printk("Unable to handle exception at EA =0x%x, vector 0x%x", | |
279 | ea, vector); | |
280 | die("Oops", regs, 9); | |
281 | } | |
282 | ||
283 | void __init trap_init(void) | |
284 | { | |
285 | /* Nothing needs to be done */ | |
286 | } | |
287 | ||
288 | asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) | |
289 | { | |
290 | siginfo_t info; | |
291 | memset(&info, 0, sizeof(info)); | |
292 | info.si_signo = SIGTRAP; | |
293 | info.si_code = TRAP_TRACE; | |
294 | info.si_addr = (void *)address; | |
295 | force_sig_info(SIGTRAP, &info, current); | |
296 | ||
297 | regs->pc += 4; | |
298 | } | |
299 | ||
300 | asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) | |
301 | { | |
302 | siginfo_t info; | |
303 | ||
304 | if (user_mode(regs)) { | |
305 | /* Send a SIGSEGV */ | |
306 | info.si_signo = SIGSEGV; | |
307 | info.si_errno = 0; | |
308 | /* info.si_code has been set above */ | |
309 | info.si_addr = (void *)address; | |
310 | force_sig_info(SIGSEGV, &info, current); | |
311 | } else { | |
312 | printk("KERNEL: Unaligned Access 0x%.8lx\n", address); | |
313 | show_registers(regs); | |
314 | die("Die:", regs, address); | |
315 | } | |
316 | ||
317 | } | |
318 | ||
319 | asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address) | |
320 | { | |
321 | siginfo_t info; | |
322 | ||
323 | if (user_mode(regs)) { | |
324 | /* Send a SIGBUS */ | |
325 | info.si_signo = SIGBUS; | |
326 | info.si_errno = 0; | |
327 | info.si_code = BUS_ADRERR; | |
328 | info.si_addr = (void *)address; | |
329 | force_sig_info(SIGBUS, &info, current); | |
330 | } else { /* Kernel mode */ | |
331 | printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address); | |
332 | show_registers(regs); | |
333 | die("Die:", regs, address); | |
334 | } | |
335 | } | |
336 | ||
337 | asmlinkage void do_illegal_instruction(struct pt_regs *regs, | |
338 | unsigned long address) | |
339 | { | |
340 | siginfo_t info; | |
341 | ||
342 | if (user_mode(regs)) { | |
343 | /* Send a SIGILL */ | |
344 | info.si_signo = SIGILL; | |
345 | info.si_errno = 0; | |
346 | info.si_code = ILL_ILLOPC; | |
347 | info.si_addr = (void *)address; | |
348 | force_sig_info(SIGBUS, &info, current); | |
349 | } else { /* Kernel mode */ | |
350 | printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n", | |
351 | address); | |
352 | show_registers(regs); | |
353 | die("Die:", regs, address); | |
354 | } | |
355 | } |