1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Port on Texas Instruments TMS320C6x architecture
4 *
5 * Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
6 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
7 */
8 #include <linux/module.h>
9 #include <linux/ptrace.h>
10 #include <linux/sched/debug.h>
11 #include <linux/bug.h>
12
13 #include <asm/soc.h>
14 #include <asm/special_insns.h>
15 #include <asm/traps.h>
16
17 int (*c6x_nmi_handler)(struct pt_regs *regs);
18
trap_init(void)19 void __init trap_init(void)
20 {
21 ack_exception(EXCEPT_TYPE_NXF);
22 ack_exception(EXCEPT_TYPE_EXC);
23 ack_exception(EXCEPT_TYPE_IXF);
24 ack_exception(EXCEPT_TYPE_SXF);
25 enable_exception();
26 }
27
show_regs(struct pt_regs * regs)28 void show_regs(struct pt_regs *regs)
29 {
30 pr_err("\n");
31 show_regs_print_info(KERN_ERR);
32 pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
33 pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
34 pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
35 pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
36 pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
37 pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
38 pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
39 pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
40 pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
41 pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
42 pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
43 pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
44 pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
45 pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
46 pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
47 pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
48 pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
49 pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
50 pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
51 pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
52 pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
53 pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
54 pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
55 pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
56 pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
57 pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
58 pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
59 pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
60 pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
61 pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
62 pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
63 pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
64 pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
65 pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
66 }
67
die(char * str,struct pt_regs * fp,int nr)68 void die(char *str, struct pt_regs *fp, int nr)
69 {
70 console_verbose();
71 pr_err("%s: %08x\n", str, nr);
72 show_regs(fp);
73
74 pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
75 current->comm, current->pid, (PAGE_SIZE +
76 (unsigned long) current));
77
78 dump_stack();
79 while (1)
80 ;
81 }
82
die_if_kernel(char * str,struct pt_regs * fp,int nr)83 static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
84 {
85 if (user_mode(fp))
86 return;
87
88 die(str, fp, nr);
89 }
90
91
92 /* Internal exceptions */
93 static struct exception_info iexcept_table[10] = {
94 { "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
95 { "Oops - fetch packet", SIGBUS, BUS_ADRERR },
96 { "Oops - execute packet", SIGILL, ILL_ILLOPC },
97 { "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
98 { "Oops - resource conflict", SIGILL, ILL_ILLOPC },
99 { "Oops - resource access", SIGILL, ILL_PRVREG },
100 { "Oops - privilege", SIGILL, ILL_PRVOPC },
101 { "Oops - loops buffer", SIGILL, ILL_ILLOPC },
102 { "Oops - software exception", SIGILL, ILL_ILLTRP },
103 { "Oops - unknown exception", SIGILL, ILL_ILLOPC }
104 };
105
106 /* External exceptions */
107 static struct exception_info eexcept_table[128] = {
108 { "Oops - external exception", SIGBUS, BUS_ADRERR },
109 { "Oops - external exception", SIGBUS, BUS_ADRERR },
110 { "Oops - external exception", SIGBUS, BUS_ADRERR },
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
141 { "Oops - external exception", SIGBUS, BUS_ADRERR },
142 { "Oops - external exception", SIGBUS, BUS_ADRERR },
143 { "Oops - external exception", SIGBUS, BUS_ADRERR },
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
174 { "Oops - external exception", SIGBUS, BUS_ADRERR },
175 { "Oops - external exception", SIGBUS, BUS_ADRERR },
176 { "Oops - external exception", SIGBUS, BUS_ADRERR },
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
207 { "Oops - external exception", SIGBUS, BUS_ADRERR },
208 { "Oops - external exception", SIGBUS, BUS_ADRERR },
209 { "Oops - external exception", SIGBUS, BUS_ADRERR },
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 - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
231 { "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
232 { "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
233 { "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
234 { "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
235 { "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
236 { "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
237 { "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
238 { "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
239 };
240
do_trap(struct exception_info * except_info,struct pt_regs * regs)241 static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
242 {
243 unsigned long addr = instruction_pointer(regs);
244
245 if (except_info->code != TRAP_BRKPT)
246 pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
247 except_info->kernel_str, regs->pc,
248 except_info->signo, except_info->code);
249
250 die_if_kernel(except_info->kernel_str, regs, addr);
251
252 force_sig_fault(except_info->signo, except_info->code,
253 (void __user *)addr);
254 }
255
256 /*
257 * Process an internal exception (non maskable)
258 */
process_iexcept(struct pt_regs * regs)259 static int process_iexcept(struct pt_regs *regs)
260 {
261 unsigned int iexcept_report = get_iexcept();
262 unsigned int iexcept_num;
263
264 ack_exception(EXCEPT_TYPE_IXF);
265
266 pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
267
268 while (iexcept_report) {
269 iexcept_num = __ffs(iexcept_report);
270 iexcept_report &= ~(1 << iexcept_num);
271 set_iexcept(iexcept_report);
272 if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
273 /* This is a breakpoint */
274 struct exception_info bkpt_exception = {
275 "Oops - undefined instruction",
276 SIGTRAP, TRAP_BRKPT
277 };
278 do_trap(&bkpt_exception, regs);
279 iexcept_report &= ~(0xFF);
280 set_iexcept(iexcept_report);
281 continue;
282 }
283
284 do_trap(&iexcept_table[iexcept_num], regs);
285 }
286 return 0;
287 }
288
289 /*
290 * Process an external exception (maskable)
291 */
process_eexcept(struct pt_regs * regs)292 static void process_eexcept(struct pt_regs *regs)
293 {
294 int evt;
295
296 pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
297
298 while ((evt = soc_get_exception()) >= 0)
299 do_trap(&eexcept_table[evt], regs);
300
301 ack_exception(EXCEPT_TYPE_EXC);
302 }
303
304 /*
305 * Main exception processing
306 */
process_exception(struct pt_regs * regs)307 asmlinkage int process_exception(struct pt_regs *regs)
308 {
309 unsigned int type;
310 unsigned int type_num;
311 unsigned int ie_num = 9; /* default is unknown exception */
312
313 while ((type = get_except_type()) != 0) {
314 type_num = fls(type) - 1;
315
316 switch (type_num) {
317 case EXCEPT_TYPE_NXF:
318 ack_exception(EXCEPT_TYPE_NXF);
319 if (c6x_nmi_handler)
320 (c6x_nmi_handler)(regs);
321 else
322 pr_alert("NMI interrupt!\n");
323 break;
324
325 case EXCEPT_TYPE_IXF:
326 if (process_iexcept(regs))
327 return 1;
328 break;
329
330 case EXCEPT_TYPE_EXC:
331 process_eexcept(regs);
332 break;
333
334 case EXCEPT_TYPE_SXF:
335 ie_num = 8;
336 default:
337 ack_exception(type_num);
338 do_trap(&iexcept_table[ie_num], regs);
339 break;
340 }
341 }
342 return 0;
343 }
344
345 static int kstack_depth_to_print = 48;
346
show_trace(unsigned long * stack,unsigned long * endstack,const char * loglvl)347 static void show_trace(unsigned long *stack, unsigned long *endstack,
348 const char *loglvl)
349 {
350 unsigned long addr;
351 int i;
352
353 printk("%sCall trace:", loglvl);
354 i = 0;
355 while (stack + 1 <= endstack) {
356 addr = *stack++;
357 /*
358 * If the address is either in the text segment of the
359 * kernel, or in the region which contains vmalloc'ed
360 * memory, it *may* be the address of a calling
361 * routine; if so, print it so that someone tracing
362 * down the cause of the crash will be able to figure
363 * out the call path that was taken.
364 */
365 if (__kernel_text_address(addr)) {
366 #ifndef CONFIG_KALLSYMS
367 if (i % 5 == 0)
368 printk("%s\n ", loglvl);
369 #endif
370 printk("%s [<%08lx>] %pS\n", loglvl, addr, (void *)addr);
371 i++;
372 }
373 }
374 printk("%s\n", loglvl);
375 }
376
show_stack(struct task_struct * task,unsigned long * stack,const char * loglvl)377 void show_stack(struct task_struct *task, unsigned long *stack,
378 const char *loglvl)
379 {
380 unsigned long *p, *endstack;
381 int i;
382
383 if (!stack) {
384 if (task && task != current)
385 /* We know this is a kernel stack,
386 so this is the start/end */
387 stack = (unsigned long *)thread_saved_ksp(task);
388 else
389 stack = (unsigned long *)&stack;
390 }
391 endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
392 & -THREAD_SIZE);
393
394 pr_debug("Stack from %08lx:", (unsigned long)stack);
395 for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
396 if (p + 1 > endstack)
397 break;
398 if (i % 8 == 0)
399 pr_cont("\n ");
400 pr_cont(" %08lx", *p++);
401 }
402 pr_cont("\n");
403 show_trace(stack, endstack, loglvl);
404 }
405
is_valid_bugaddr(unsigned long addr)406 int is_valid_bugaddr(unsigned long addr)
407 {
408 return __kernel_text_address(addr);
409 }
410