1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
|
/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/kallsyms.h>
#include <linux/bug.h>
#include <asm/soc.h>
#include <asm/traps.h>
int (*c6x_nmi_handler)(struct pt_regs *regs);
void __init trap_init(void)
{
ack_exception(EXCEPT_TYPE_NXF);
ack_exception(EXCEPT_TYPE_EXC);
ack_exception(EXCEPT_TYPE_IXF);
ack_exception(EXCEPT_TYPE_SXF);
enable_exception();
}
void show_regs(struct pt_regs *regs)
{
pr_err("\n");
pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
}
void dump_stack(void)
{
unsigned long stack;
show_stack(current, &stack);
}
EXPORT_SYMBOL(dump_stack);
void die(char *str, struct pt_regs *fp, int nr)
{
console_verbose();
pr_err("%s: %08x\n", str, nr);
show_regs(fp);
pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, (PAGE_SIZE +
(unsigned long) current));
dump_stack();
while (1)
;
}
static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
{
if (user_mode(fp))
return;
die(str, fp, nr);
}
/* Internal exceptions */
static struct exception_info iexcept_table[10] = {
{ "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
{ "Oops - fetch packet", SIGBUS, BUS_ADRERR },
{ "Oops - execute packet", SIGILL, ILL_ILLOPC },
{ "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
{ "Oops - resource conflict", SIGILL, ILL_ILLOPC },
{ "Oops - resource access", SIGILL, ILL_PRVREG },
{ "Oops - privilege", SIGILL, ILL_PRVOPC },
{ "Oops - loops buffer", SIGILL, ILL_ILLOPC },
{ "Oops - software exception", SIGILL, ILL_ILLTRP },
{ "Oops - unknown exception", SIGILL, ILL_ILLOPC }
};
/* External exceptions */
static struct exception_info eexcept_table[128] = {
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
{ "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
{ "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
{ "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
{ "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
{ "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
{ "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
{ "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
{ "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
};
static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
siginfo_t info;
if (except_info->code != TRAP_BRKPT)
pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
except_info->kernel_str, regs->pc,
except_info->signo, except_info->code);
die_if_kernel(except_info->kernel_str, regs, addr);
info.si_signo = except_info->signo;
info.si_errno = 0;
info.si_code = except_info->code;
info.si_addr = (void __user *)addr;
force_sig_info(except_info->signo, &info, current);
}
/*
* Process an internal exception (non maskable)
*/
static int process_iexcept(struct pt_regs *regs)
{
unsigned int iexcept_report = get_iexcept();
unsigned int iexcept_num;
ack_exception(EXCEPT_TYPE_IXF);
pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
while (iexcept_report) {
iexcept_num = __ffs(iexcept_report);
iexcept_report &= ~(1 << iexcept_num);
set_iexcept(iexcept_report);
if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
/* This is a breakpoint */
struct exception_info bkpt_exception = {
"Oops - undefined instruction",
SIGTRAP, TRAP_BRKPT
};
do_trap(&bkpt_exception, regs);
iexcept_report &= ~(0xFF);
set_iexcept(iexcept_report);
continue;
}
do_trap(&iexcept_table[iexcept_num], regs);
}
return 0;
}
/*
* Process an external exception (maskable)
*/
static void process_eexcept(struct pt_regs *regs)
{
int evt;
pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
while ((evt = soc_get_exception()) >= 0)
do_trap(&eexcept_table[evt], regs);
ack_exception(EXCEPT_TYPE_EXC);
}
/*
* Main exception processing
*/
asmlinkage int process_exception(struct pt_regs *regs)
{
unsigned int type;
unsigned int type_num;
unsigned int ie_num = 9; /* default is unknown exception */
while ((type = get_except_type()) != 0) {
type_num = fls(type) - 1;
switch (type_num) {
case EXCEPT_TYPE_NXF:
ack_exception(EXCEPT_TYPE_NXF);
if (c6x_nmi_handler)
(c6x_nmi_handler)(regs);
else
pr_alert("NMI interrupt!\n");
break;
case EXCEPT_TYPE_IXF:
if (process_iexcept(regs))
return 1;
break;
case EXCEPT_TYPE_EXC:
process_eexcept(regs);
break;
case EXCEPT_TYPE_SXF:
ie_num = 8;
default:
ack_exception(type_num);
do_trap(&iexcept_table[ie_num], regs);
break;
}
}
return 0;
}
static int kstack_depth_to_print = 48;
static void show_trace(unsigned long *stack, unsigned long *endstack)
{
unsigned long addr;
int i;
pr_debug("Call trace:");
i = 0;
while (stack + 1 <= endstack) {
addr = *stack++;
/*
* If the address is either in the text segment of the
* kernel, or in the region which contains vmalloc'ed
* memory, it *may* be the address of a calling
* routine; if so, print it so that someone tracing
* down the cause of the crash will be able to figure
* out the call path that was taken.
*/
if (__kernel_text_address(addr)) {
#ifndef CONFIG_KALLSYMS
if (i % 5 == 0)
pr_debug("\n ");
#endif
pr_debug(" [<%08lx>]", addr);
print_symbol(" %s\n", addr);
i++;
}
}
pr_debug("\n");
}
void show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *p, *endstack;
int i;
if (!stack) {
if (task && task != current)
/* We know this is a kernel stack,
so this is the start/end */
stack = (unsigned long *)thread_saved_ksp(task);
else
stack = (unsigned long *)&stack;
}
endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
& -THREAD_SIZE);
pr_debug("Stack from %08lx:", (unsigned long)stack);
for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
if (p + 1 > endstack)
break;
if (i % 8 == 0)
pr_cont("\n ");
pr_cont(" %08lx", *p++);
}
pr_cont("\n");
show_trace(stack, endstack);
}
int is_valid_bugaddr(unsigned long addr)
{
return __kernel_text_address(addr);
}
|
