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signal: Ensure every siginfo we send has all bits initialized
[mirror_ubuntu-hirsute-kernel.git] / arch / openrisc / kernel / traps.c
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/sched/debug.h>
26 #include <linux/sched/task_stack.h>
27 #include <linux/kernel.h>
28 #include <linux/extable.h>
29 #include <linux/kmod.h>
30 #include <linux/string.h>
31 #include <linux/errno.h>
32 #include <linux/ptrace.h>
33 #include <linux/timer.h>
34 #include <linux/mm.h>
35 #include <linux/kallsyms.h>
36 #include <linux/uaccess.h>
37
38 #include <asm/segment.h>
39 #include <asm/io.h>
40 #include <asm/pgtable.h>
41 #include <asm/unwinder.h>
42 #include <asm/sections.h>
43
44 int kstack_depth_to_print = 0x180;
45 int lwa_flag;
46 unsigned long __user *lwa_addr;
47
48 void print_trace(void *data, unsigned long addr, int reliable)
49 {
50 pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
51 (void *) addr);
52 }
53
54 /* displays a short stack trace */
55 void show_stack(struct task_struct *task, unsigned long *esp)
56 {
57 if (esp == NULL)
58 esp = (unsigned long *)&esp;
59
60 pr_emerg("Call trace:\n");
61 unwind_stack(NULL, esp, print_trace);
62 }
63
64 void show_trace_task(struct task_struct *tsk)
65 {
66 /*
67 * TODO: SysRq-T trace dump...
68 */
69 }
70
71 void show_registers(struct pt_regs *regs)
72 {
73 int i;
74 int in_kernel = 1;
75 unsigned long esp;
76
77 esp = (unsigned long)(regs->sp);
78 if (user_mode(regs))
79 in_kernel = 0;
80
81 printk("CPU #: %d\n"
82 " PC: %08lx SR: %08lx SP: %08lx\n",
83 smp_processor_id(), regs->pc, regs->sr, regs->sp);
84 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
85 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
86 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
87 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
88 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
89 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
90 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
91 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
92 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
93 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
94 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
95 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
96 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
97 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
98 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
99 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
100 printk(" RES: %08lx oGPR11: %08lx\n",
101 regs->gpr[11], regs->orig_gpr11);
102
103 printk("Process %s (pid: %d, stackpage=%08lx)\n",
104 current->comm, current->pid, (unsigned long)current);
105 /*
106 * When in-kernel, we also print out the stack and code at the
107 * time of the fault..
108 */
109 if (in_kernel) {
110
111 printk("\nStack: ");
112 show_stack(NULL, (unsigned long *)esp);
113
114 printk("\nCode: ");
115 if (regs->pc < PAGE_OFFSET)
116 goto bad;
117
118 for (i = -24; i < 24; i++) {
119 unsigned char c;
120 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
121 bad:
122 printk(" Bad PC value.");
123 break;
124 }
125
126 if (i == 0)
127 printk("(%02x) ", c);
128 else
129 printk("%02x ", c);
130 }
131 }
132 printk("\n");
133 }
134
135 void nommu_dump_state(struct pt_regs *regs,
136 unsigned long ea, unsigned long vector)
137 {
138 int i;
139 unsigned long addr, stack = regs->sp;
140
141 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
142
143 printk("CPU #: %d\n"
144 " PC: %08lx SR: %08lx SP: %08lx\n",
145 0, regs->pc, regs->sr, regs->sp);
146 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
147 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
148 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
149 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
150 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
151 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
152 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
153 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
154 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
155 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
156 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
157 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
158 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
159 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
160 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
161 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
162 printk(" RES: %08lx oGPR11: %08lx\n",
163 regs->gpr[11], regs->orig_gpr11);
164
165 printk("Process %s (pid: %d, stackpage=%08lx)\n",
166 ((struct task_struct *)(__pa(current)))->comm,
167 ((struct task_struct *)(__pa(current)))->pid,
168 (unsigned long)current);
169
170 printk("\nStack: ");
171 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
172 for (i = 0; i < kstack_depth_to_print; i++) {
173 if (((long)stack & (THREAD_SIZE - 1)) == 0)
174 break;
175 stack++;
176
177 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
178 *((unsigned long *)(__pa(stack))));
179 }
180 printk("\n");
181
182 printk("Call Trace: ");
183 i = 1;
184 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
185 addr = *((unsigned long *)__pa(stack));
186 stack++;
187
188 if (kernel_text_address(addr)) {
189 if (i && ((i % 6) == 0))
190 printk("\n ");
191 printk(" [<%08lx>]", addr);
192 i++;
193 }
194 }
195 printk("\n");
196
197 printk("\nCode: ");
198
199 for (i = -24; i < 24; i++) {
200 unsigned char c;
201 c = ((unsigned char *)(__pa(regs->pc)))[i];
202
203 if (i == 0)
204 printk("(%02x) ", c);
205 else
206 printk("%02x ", c);
207 }
208 printk("\n");
209 }
210
211 /* This is normally the 'Oops' routine */
212 void die(const char *str, struct pt_regs *regs, long err)
213 {
214
215 console_verbose();
216 printk("\n%s#: %04lx\n", str, err & 0xffff);
217 show_registers(regs);
218 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
219 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
220
221 /* shut down interrupts */
222 local_irq_disable();
223
224 __asm__ __volatile__("l.nop 1");
225 do {} while (1);
226 #endif
227 do_exit(SIGSEGV);
228 }
229
230 /* This is normally the 'Oops' routine */
231 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
232 {
233 if (user_mode(regs))
234 return;
235
236 die(str, regs, err);
237 }
238
239 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
240 {
241 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
242 ea, vector);
243 die("Oops", regs, 9);
244 }
245
246 void __init trap_init(void)
247 {
248 /* Nothing needs to be done */
249 }
250
251 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
252 {
253 siginfo_t info;
254 clear_siginfo(&info);
255 info.si_signo = SIGTRAP;
256 info.si_code = TRAP_TRACE;
257 info.si_addr = (void *)address;
258 force_sig_info(SIGTRAP, &info, current);
259
260 regs->pc += 4;
261 }
262
263 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
264 {
265 siginfo_t info;
266
267 if (user_mode(regs)) {
268 /* Send a SIGBUS */
269 clear_siginfo(&info);
270 info.si_signo = SIGBUS;
271 info.si_errno = 0;
272 info.si_code = BUS_ADRALN;
273 info.si_addr = (void __user *)address;
274 force_sig_info(SIGBUS, &info, current);
275 } else {
276 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
277 show_registers(regs);
278 die("Die:", regs, address);
279 }
280
281 }
282
283 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
284 {
285 siginfo_t info;
286
287 if (user_mode(regs)) {
288 /* Send a SIGBUS */
289 clear_siginfo(&info);
290 info.si_signo = SIGBUS;
291 info.si_errno = 0;
292 info.si_code = BUS_ADRERR;
293 info.si_addr = (void *)address;
294 force_sig_info(SIGBUS, &info, current);
295 } else { /* Kernel mode */
296 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
297 show_registers(regs);
298 die("Die:", regs, address);
299 }
300 }
301
302 static inline int in_delay_slot(struct pt_regs *regs)
303 {
304 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
305 /* No delay slot flag, do the old way */
306 unsigned int op, insn;
307
308 insn = *((unsigned int *)regs->pc);
309 op = insn >> 26;
310 switch (op) {
311 case 0x00: /* l.j */
312 case 0x01: /* l.jal */
313 case 0x03: /* l.bnf */
314 case 0x04: /* l.bf */
315 case 0x11: /* l.jr */
316 case 0x12: /* l.jalr */
317 return 1;
318 default:
319 return 0;
320 }
321 #else
322 return regs->sr & SPR_SR_DSX;
323 #endif
324 }
325
326 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
327 {
328 int displacement;
329 unsigned int rb, op, jmp;
330
331 if (unlikely(in_delay_slot(regs))) {
332 /* In delay slot, instruction at pc is a branch, simulate it */
333 jmp = *((unsigned int *)regs->pc);
334
335 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
336 rb = (jmp & 0x0000ffff) >> 11;
337 op = jmp >> 26;
338
339 switch (op) {
340 case 0x00: /* l.j */
341 regs->pc += displacement;
342 return;
343 case 0x01: /* l.jal */
344 regs->pc += displacement;
345 regs->gpr[9] = regs->pc + 8;
346 return;
347 case 0x03: /* l.bnf */
348 if (regs->sr & SPR_SR_F)
349 regs->pc += 8;
350 else
351 regs->pc += displacement;
352 return;
353 case 0x04: /* l.bf */
354 if (regs->sr & SPR_SR_F)
355 regs->pc += displacement;
356 else
357 regs->pc += 8;
358 return;
359 case 0x11: /* l.jr */
360 regs->pc = regs->gpr[rb];
361 return;
362 case 0x12: /* l.jalr */
363 regs->pc = regs->gpr[rb];
364 regs->gpr[9] = regs->pc + 8;
365 return;
366 default:
367 break;
368 }
369 } else {
370 regs->pc += 4;
371 }
372 }
373
374 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
375 unsigned int insn)
376 {
377 unsigned int ra, rd;
378 unsigned long value;
379 unsigned long orig_pc;
380 long imm;
381
382 const struct exception_table_entry *entry;
383
384 orig_pc = regs->pc;
385 adjust_pc(regs, address);
386
387 ra = (insn >> 16) & 0x1f;
388 rd = (insn >> 21) & 0x1f;
389 imm = (short)insn;
390 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
391
392 if ((unsigned long)lwa_addr & 0x3) {
393 do_unaligned_access(regs, address);
394 return;
395 }
396
397 if (get_user(value, lwa_addr)) {
398 if (user_mode(regs)) {
399 force_sig(SIGSEGV, current);
400 return;
401 }
402
403 if ((entry = search_exception_tables(orig_pc))) {
404 regs->pc = entry->fixup;
405 return;
406 }
407
408 /* kernel access in kernel space, load it directly */
409 value = *((unsigned long *)lwa_addr);
410 }
411
412 lwa_flag = 1;
413 regs->gpr[rd] = value;
414 }
415
416 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
417 unsigned int insn)
418 {
419 unsigned long __user *vaddr;
420 unsigned long orig_pc;
421 unsigned int ra, rb;
422 long imm;
423
424 const struct exception_table_entry *entry;
425
426 orig_pc = regs->pc;
427 adjust_pc(regs, address);
428
429 ra = (insn >> 16) & 0x1f;
430 rb = (insn >> 11) & 0x1f;
431 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
432 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
433
434 if (!lwa_flag || vaddr != lwa_addr) {
435 regs->sr &= ~SPR_SR_F;
436 return;
437 }
438
439 if ((unsigned long)vaddr & 0x3) {
440 do_unaligned_access(regs, address);
441 return;
442 }
443
444 if (put_user(regs->gpr[rb], vaddr)) {
445 if (user_mode(regs)) {
446 force_sig(SIGSEGV, current);
447 return;
448 }
449
450 if ((entry = search_exception_tables(orig_pc))) {
451 regs->pc = entry->fixup;
452 return;
453 }
454
455 /* kernel access in kernel space, store it directly */
456 *((unsigned long *)vaddr) = regs->gpr[rb];
457 }
458
459 lwa_flag = 0;
460 regs->sr |= SPR_SR_F;
461 }
462
463 #define INSN_LWA 0x1b
464 #define INSN_SWA 0x33
465
466 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
467 unsigned long address)
468 {
469 siginfo_t info;
470 unsigned int op;
471 unsigned int insn = *((unsigned int *)address);
472
473 op = insn >> 26;
474
475 switch (op) {
476 case INSN_LWA:
477 simulate_lwa(regs, address, insn);
478 return;
479
480 case INSN_SWA:
481 simulate_swa(regs, address, insn);
482 return;
483
484 default:
485 break;
486 }
487
488 if (user_mode(regs)) {
489 /* Send a SIGILL */
490 clear_siginfo(&info);
491 info.si_signo = SIGILL;
492 info.si_errno = 0;
493 info.si_code = ILL_ILLOPC;
494 info.si_addr = (void *)address;
495 force_sig_info(SIGBUS, &info, current);
496 } else { /* Kernel mode */
497 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
498 address);
499 show_registers(regs);
500 die("Die:", regs, address);
501 }
502 }
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