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Revert "tty: hvc: Fix data abort due to race in hvc_open"
[linux/fpc-iii.git] / arch / openrisc / kernel / traps.c
blobc11aa2e17ce05e6bf278921347b4e8fcbd855897
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * OpenRISC traps.c
4 *
5 * Linux architectural port borrowing liberally from similar works of
6 * others. All original copyrights apply as per the original source
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture:
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
12 *
13 * Here we handle the break vectors not used by the system call
14 * mechanism, as well as some general stack/register dumping
15 * things.
16 */
17
18 #include <linux/init.h>
19 #include <linux/sched.h>
20 #include <linux/sched/debug.h>
21 #include <linux/sched/task_stack.h>
22 #include <linux/kernel.h>
23 #include <linux/extable.h>
24 #include <linux/kmod.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
27 #include <linux/ptrace.h>
28 #include <linux/timer.h>
29 #include <linux/mm.h>
30 #include <linux/kallsyms.h>
31 #include <linux/uaccess.h>
32
33 #include <asm/io.h>
34 #include <asm/pgtable.h>
35 #include <asm/unwinder.h>
36 #include <asm/sections.h>
37
38 int kstack_depth_to_print = 0x180;
39 int lwa_flag;
40 unsigned long __user *lwa_addr;
41
42 void print_trace(void *data, unsigned long addr, int reliable)
43 {
44 pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
45 (void *) addr);
46 }
47
48 /* displays a short stack trace */
49 void show_stack(struct task_struct *task, unsigned long *esp)
50 {
51 if (esp == NULL)
52 esp = (unsigned long *)&esp;
53
54 pr_emerg("Call trace:\n");
55 unwind_stack(NULL, esp, print_trace);
56 }
57
58 void show_registers(struct pt_regs *regs)
59 {
60 int i;
61 int in_kernel = 1;
62 unsigned long esp;
63
64 esp = (unsigned long)(regs->sp);
65 if (user_mode(regs))
66 in_kernel = 0;
67
68 printk("CPU #: %d\n"
69 " PC: %08lx SR: %08lx SP: %08lx\n",
70 smp_processor_id(), regs->pc, regs->sr, regs->sp);
71 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
72 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
73 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
74 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
75 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
76 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
77 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
78 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
79 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
80 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
81 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
82 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
83 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
84 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
85 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
86 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
87 printk(" RES: %08lx oGPR11: %08lx\n",
88 regs->gpr[11], regs->orig_gpr11);
89
90 printk("Process %s (pid: %d, stackpage=%08lx)\n",
91 current->comm, current->pid, (unsigned long)current);
92 /*
93 * When in-kernel, we also print out the stack and code at the
94 * time of the fault..
95 */
96 if (in_kernel) {
97
98 printk("\nStack: ");
99 show_stack(NULL, (unsigned long *)esp);
100
101 printk("\nCode: ");
102 if (regs->pc < PAGE_OFFSET)
103 goto bad;
104
105 for (i = -24; i < 24; i++) {
106 unsigned char c;
107 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
108 bad:
109 printk(" Bad PC value.");
110 break;
111 }
112
113 if (i == 0)
114 printk("(%02x) ", c);
115 else
116 printk("%02x ", c);
117 }
118 }
119 printk("\n");
120 }
121
122 void nommu_dump_state(struct pt_regs *regs,
123 unsigned long ea, unsigned long vector)
124 {
125 int i;
126 unsigned long addr, stack = regs->sp;
127
128 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
129
130 printk("CPU #: %d\n"
131 " PC: %08lx SR: %08lx SP: %08lx\n",
132 0, regs->pc, regs->sr, regs->sp);
133 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
134 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
135 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
136 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
137 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
138 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
139 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
140 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
141 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
142 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
143 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
144 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
145 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
146 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
147 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
148 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
149 printk(" RES: %08lx oGPR11: %08lx\n",
150 regs->gpr[11], regs->orig_gpr11);
151
152 printk("Process %s (pid: %d, stackpage=%08lx)\n",
153 ((struct task_struct *)(__pa(current)))->comm,
154 ((struct task_struct *)(__pa(current)))->pid,
155 (unsigned long)current);
156
157 printk("\nStack: ");
158 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
159 for (i = 0; i < kstack_depth_to_print; i++) {
160 if (((long)stack & (THREAD_SIZE - 1)) == 0)
161 break;
162 stack++;
163
164 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
165 *((unsigned long *)(__pa(stack))));
166 }
167 printk("\n");
168
169 printk("Call Trace: ");
170 i = 1;
171 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
172 addr = *((unsigned long *)__pa(stack));
173 stack++;
174
175 if (kernel_text_address(addr)) {
176 if (i && ((i % 6) == 0))
177 printk("\n ");
178 printk(" [<%08lx>]", addr);
179 i++;
180 }
181 }
182 printk("\n");
183
184 printk("\nCode: ");
185
186 for (i = -24; i < 24; i++) {
187 unsigned char c;
188 c = ((unsigned char *)(__pa(regs->pc)))[i];
189
190 if (i == 0)
191 printk("(%02x) ", c);
192 else
193 printk("%02x ", c);
194 }
195 printk("\n");
196 }
197
198 /* This is normally the 'Oops' routine */
199 void die(const char *str, struct pt_regs *regs, long err)
200 {
201
202 console_verbose();
203 printk("\n%s#: %04lx\n", str, err & 0xffff);
204 show_registers(regs);
205 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
206 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
207
208 /* shut down interrupts */
209 local_irq_disable();
210
211 __asm__ __volatile__("l.nop 1");
212 do {} while (1);
213 #endif
214 do_exit(SIGSEGV);
215 }
216
217 /* This is normally the 'Oops' routine */
218 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
219 {
220 if (user_mode(regs))
221 return;
222
223 die(str, regs, err);
224 }
225
226 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
227 {
228 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
229 ea, vector);
230 die("Oops", regs, 9);
231 }
232
233 void __init trap_init(void)
234 {
235 /* Nothing needs to be done */
236 }
237
238 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
239 {
240 force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
241
242 regs->pc += 4;
243 }
244
245 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
246 {
247 if (user_mode(regs)) {
248 /* Send a SIGBUS */
249 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
250 } else {
251 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
252 show_registers(regs);
253 die("Die:", regs, address);
254 }
255
256 }
257
258 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
259 {
260 if (user_mode(regs)) {
261 /* Send a SIGBUS */
262 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
263 } else { /* Kernel mode */
264 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
265 show_registers(regs);
266 die("Die:", regs, address);
267 }
268 }
269
270 static inline int in_delay_slot(struct pt_regs *regs)
271 {
272 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
273 /* No delay slot flag, do the old way */
274 unsigned int op, insn;
275
276 insn = *((unsigned int *)regs->pc);
277 op = insn >> 26;
278 switch (op) {
279 case 0x00: /* l.j */
280 case 0x01: /* l.jal */
281 case 0x03: /* l.bnf */
282 case 0x04: /* l.bf */
283 case 0x11: /* l.jr */
284 case 0x12: /* l.jalr */
285 return 1;
286 default:
287 return 0;
288 }
289 #else
290 return mfspr(SPR_SR) & SPR_SR_DSX;
291 #endif
292 }
293
294 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
295 {
296 int displacement;
297 unsigned int rb, op, jmp;
298
299 if (unlikely(in_delay_slot(regs))) {
300 /* In delay slot, instruction at pc is a branch, simulate it */
301 jmp = *((unsigned int *)regs->pc);
302
303 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
304 rb = (jmp & 0x0000ffff) >> 11;
305 op = jmp >> 26;
306
307 switch (op) {
308 case 0x00: /* l.j */
309 regs->pc += displacement;
310 return;
311 case 0x01: /* l.jal */
312 regs->pc += displacement;
313 regs->gpr[9] = regs->pc + 8;
314 return;
315 case 0x03: /* l.bnf */
316 if (regs->sr & SPR_SR_F)
317 regs->pc += 8;
318 else
319 regs->pc += displacement;
320 return;
321 case 0x04: /* l.bf */
322 if (regs->sr & SPR_SR_F)
323 regs->pc += displacement;
324 else
325 regs->pc += 8;
326 return;
327 case 0x11: /* l.jr */
328 regs->pc = regs->gpr[rb];
329 return;
330 case 0x12: /* l.jalr */
331 regs->pc = regs->gpr[rb];
332 regs->gpr[9] = regs->pc + 8;
333 return;
334 default:
335 break;
336 }
337 } else {
338 regs->pc += 4;
339 }
340 }
341
342 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
343 unsigned int insn)
344 {
345 unsigned int ra, rd;
346 unsigned long value;
347 unsigned long orig_pc;
348 long imm;
349
350 const struct exception_table_entry *entry;
351
352 orig_pc = regs->pc;
353 adjust_pc(regs, address);
354
355 ra = (insn >> 16) & 0x1f;
356 rd = (insn >> 21) & 0x1f;
357 imm = (short)insn;
358 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
359
360 if ((unsigned long)lwa_addr & 0x3) {
361 do_unaligned_access(regs, address);
362 return;
363 }
364
365 if (get_user(value, lwa_addr)) {
366 if (user_mode(regs)) {
367 force_sig(SIGSEGV);
368 return;
369 }
370
371 if ((entry = search_exception_tables(orig_pc))) {
372 regs->pc = entry->fixup;
373 return;
374 }
375
376 /* kernel access in kernel space, load it directly */
377 value = *((unsigned long *)lwa_addr);
378 }
379
380 lwa_flag = 1;
381 regs->gpr[rd] = value;
382 }
383
384 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
385 unsigned int insn)
386 {
387 unsigned long __user *vaddr;
388 unsigned long orig_pc;
389 unsigned int ra, rb;
390 long imm;
391
392 const struct exception_table_entry *entry;
393
394 orig_pc = regs->pc;
395 adjust_pc(regs, address);
396
397 ra = (insn >> 16) & 0x1f;
398 rb = (insn >> 11) & 0x1f;
399 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
400 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
401
402 if (!lwa_flag || vaddr != lwa_addr) {
403 regs->sr &= ~SPR_SR_F;
404 return;
405 }
406
407 if ((unsigned long)vaddr & 0x3) {
408 do_unaligned_access(regs, address);
409 return;
410 }
411
412 if (put_user(regs->gpr[rb], vaddr)) {
413 if (user_mode(regs)) {
414 force_sig(SIGSEGV);
415 return;
416 }
417
418 if ((entry = search_exception_tables(orig_pc))) {
419 regs->pc = entry->fixup;
420 return;
421 }
422
423 /* kernel access in kernel space, store it directly */
424 *((unsigned long *)vaddr) = regs->gpr[rb];
425 }
426
427 lwa_flag = 0;
428 regs->sr |= SPR_SR_F;
429 }
430
431 #define INSN_LWA 0x1b
432 #define INSN_SWA 0x33
433
434 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
435 unsigned long address)
436 {
437 unsigned int op;
438 unsigned int insn = *((unsigned int *)address);
439
440 op = insn >> 26;
441
442 switch (op) {
443 case INSN_LWA:
444 simulate_lwa(regs, address, insn);
445 return;
446
447 case INSN_SWA:
448 simulate_swa(regs, address, insn);
449 return;
450
451 default:
452 break;
453 }
454
455 if (user_mode(regs)) {
456 /* Send a SIGILL */
457 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
458 } else { /* Kernel mode */
459 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
460 address);
461 show_registers(regs);
462 die("Die:", regs, address);
463 }
464 }
Linux with added FPC-III support