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