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WIP FPC-III support
[linux/fpc-iii.git] / arch / openrisc / kernel / traps.c
blob4d61333c262325bd652d0b120ff40050527c0ac3
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/unwinder.h>
35 #include <asm/sections.h>
36
37 int kstack_depth_to_print = 0x180;
38 int lwa_flag;
39 unsigned long __user *lwa_addr;
40
41 void print_trace(void *data, unsigned long addr, int reliable)
42 {
43 const char *loglvl = data;
44
45 printk("%s[<%p>] %s%pS\n", loglvl, (void *) addr, reliable ? "" : "? ",
46 (void *) addr);
47 }
48
49 /* displays a short stack trace */
50 void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
51 {
52 if (esp == NULL)
53 esp = (unsigned long *)&esp;
54
55 printk("%sCall trace:\n", loglvl);
56 unwind_stack((void *)loglvl, esp, print_trace);
57 }
58
59 void show_registers(struct pt_regs *regs)
60 {
61 int i;
62 int in_kernel = 1;
63 unsigned long esp;
64
65 esp = (unsigned long)(regs->sp);
66 if (user_mode(regs))
67 in_kernel = 0;
68
69 printk("CPU #: %d\n"
70 " PC: %08lx SR: %08lx SP: %08lx\n",
71 smp_processor_id(), regs->pc, regs->sr, regs->sp);
72 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
73 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
74 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
75 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
76 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
77 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
78 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
79 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
80 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
81 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
82 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
83 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
84 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
85 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
86 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
87 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
88 printk(" RES: %08lx oGPR11: %08lx\n",
89 regs->gpr[11], regs->orig_gpr11);
90
91 printk("Process %s (pid: %d, stackpage=%08lx)\n",
92 current->comm, current->pid, (unsigned long)current);
93 /*
94 * When in-kernel, we also print out the stack and code at the
95 * time of the fault..
96 */
97 if (in_kernel) {
98
99 printk("\nStack: ");
100 show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
101
102 printk("\nCode: ");
103 if (regs->pc < PAGE_OFFSET)
104 goto bad;
105
106 for (i = -24; i < 24; i++) {
107 unsigned char c;
108 if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
109 bad:
110 printk(" Bad PC value.");
111 break;
112 }
113
114 if (i == 0)
115 printk("(%02x) ", c);
116 else
117 printk("%02x ", c);
118 }
119 }
120 printk("\n");
121 }
122
123 void nommu_dump_state(struct pt_regs *regs,
124 unsigned long ea, unsigned long vector)
125 {
126 int i;
127 unsigned long addr, stack = regs->sp;
128
129 printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
130
131 printk("CPU #: %d\n"
132 " PC: %08lx SR: %08lx SP: %08lx\n",
133 0, regs->pc, regs->sr, regs->sp);
134 printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
135 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
136 printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
137 regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
138 printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
139 regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
140 printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
141 regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
142 printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
143 regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
144 printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
145 regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
146 printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
147 regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
148 printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
149 regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
150 printk(" RES: %08lx oGPR11: %08lx\n",
151 regs->gpr[11], regs->orig_gpr11);
152
153 printk("Process %s (pid: %d, stackpage=%08lx)\n",
154 ((struct task_struct *)(__pa(current)))->comm,
155 ((struct task_struct *)(__pa(current)))->pid,
156 (unsigned long)current);
157
158 printk("\nStack: ");
159 printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
160 for (i = 0; i < kstack_depth_to_print; i++) {
161 if (((long)stack & (THREAD_SIZE - 1)) == 0)
162 break;
163 stack++;
164
165 printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
166 *((unsigned long *)(__pa(stack))));
167 }
168 printk("\n");
169
170 printk("Call Trace: ");
171 i = 1;
172 while (((long)stack & (THREAD_SIZE - 1)) != 0) {
173 addr = *((unsigned long *)__pa(stack));
174 stack++;
175
176 if (kernel_text_address(addr)) {
177 if (i && ((i % 6) == 0))
178 printk("\n ");
179 printk(" [<%08lx>]", addr);
180 i++;
181 }
182 }
183 printk("\n");
184
185 printk("\nCode: ");
186
187 for (i = -24; i < 24; i++) {
188 unsigned char c;
189 c = ((unsigned char *)(__pa(regs->pc)))[i];
190
191 if (i == 0)
192 printk("(%02x) ", c);
193 else
194 printk("%02x ", c);
195 }
196 printk("\n");
197 }
198
199 /* This is normally the 'Oops' routine */
200 void die(const char *str, struct pt_regs *regs, long err)
201 {
202
203 console_verbose();
204 printk("\n%s#: %04lx\n", str, err & 0xffff);
205 show_registers(regs);
206 #ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
207 printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
208
209 /* shut down interrupts */
210 local_irq_disable();
211
212 __asm__ __volatile__("l.nop 1");
213 do {} while (1);
214 #endif
215 do_exit(SIGSEGV);
216 }
217
218 /* This is normally the 'Oops' routine */
219 void die_if_kernel(const char *str, struct pt_regs *regs, long err)
220 {
221 if (user_mode(regs))
222 return;
223
224 die(str, regs, err);
225 }
226
227 void unhandled_exception(struct pt_regs *regs, int ea, int vector)
228 {
229 printk("Unable to handle exception at EA =0x%x, vector 0x%x",
230 ea, vector);
231 die("Oops", regs, 9);
232 }
233
234 void __init trap_init(void)
235 {
236 /* Nothing needs to be done */
237 }
238
239 asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
240 {
241 force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
242 }
243
244 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
245 {
246 if (user_mode(regs)) {
247 /* Send a SIGBUS */
248 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
249 } else {
250 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
251 show_registers(regs);
252 die("Die:", regs, address);
253 }
254
255 }
256
257 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
258 {
259 if (user_mode(regs)) {
260 /* Send a SIGBUS */
261 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
262 } else { /* Kernel mode */
263 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
264 show_registers(regs);
265 die("Die:", regs, address);
266 }
267 }
268
269 static inline int in_delay_slot(struct pt_regs *regs)
270 {
271 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
272 /* No delay slot flag, do the old way */
273 unsigned int op, insn;
274
275 insn = *((unsigned int *)regs->pc);
276 op = insn >> 26;
277 switch (op) {
278 case 0x00: /* l.j */
279 case 0x01: /* l.jal */
280 case 0x03: /* l.bnf */
281 case 0x04: /* l.bf */
282 case 0x11: /* l.jr */
283 case 0x12: /* l.jalr */
284 return 1;
285 default:
286 return 0;
287 }
288 #else
289 return mfspr(SPR_SR) & SPR_SR_DSX;
290 #endif
291 }
292
293 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
294 {
295 int displacement;
296 unsigned int rb, op, jmp;
297
298 if (unlikely(in_delay_slot(regs))) {
299 /* In delay slot, instruction at pc is a branch, simulate it */
300 jmp = *((unsigned int *)regs->pc);
301
302 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
303 rb = (jmp & 0x0000ffff) >> 11;
304 op = jmp >> 26;
305
306 switch (op) {
307 case 0x00: /* l.j */
308 regs->pc += displacement;
309 return;
310 case 0x01: /* l.jal */
311 regs->pc += displacement;
312 regs->gpr[9] = regs->pc + 8;
313 return;
314 case 0x03: /* l.bnf */
315 if (regs->sr & SPR_SR_F)
316 regs->pc += 8;
317 else
318 regs->pc += displacement;
319 return;
320 case 0x04: /* l.bf */
321 if (regs->sr & SPR_SR_F)
322 regs->pc += displacement;
323 else
324 regs->pc += 8;
325 return;
326 case 0x11: /* l.jr */
327 regs->pc = regs->gpr[rb];
328 return;
329 case 0x12: /* l.jalr */
330 regs->pc = regs->gpr[rb];
331 regs->gpr[9] = regs->pc + 8;
332 return;
333 default:
334 break;
335 }
336 } else {
337 regs->pc += 4;
338 }
339 }
340
341 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
342 unsigned int insn)
343 {
344 unsigned int ra, rd;
345 unsigned long value;
346 unsigned long orig_pc;
347 long imm;
348
349 const struct exception_table_entry *entry;
350
351 orig_pc = regs->pc;
352 adjust_pc(regs, address);
353
354 ra = (insn >> 16) & 0x1f;
355 rd = (insn >> 21) & 0x1f;
356 imm = (short)insn;
357 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
358
359 if ((unsigned long)lwa_addr & 0x3) {
360 do_unaligned_access(regs, address);
361 return;
362 }
363
364 if (get_user(value, lwa_addr)) {
365 if (user_mode(regs)) {
366 force_sig(SIGSEGV);
367 return;
368 }
369
370 if ((entry = search_exception_tables(orig_pc))) {
371 regs->pc = entry->fixup;
372 return;
373 }
374
375 /* kernel access in kernel space, load it directly */
376 value = *((unsigned long *)lwa_addr);
377 }
378
379 lwa_flag = 1;
380 regs->gpr[rd] = value;
381 }
382
383 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
384 unsigned int insn)
385 {
386 unsigned long __user *vaddr;
387 unsigned long orig_pc;
388 unsigned int ra, rb;
389 long imm;
390
391 const struct exception_table_entry *entry;
392
393 orig_pc = regs->pc;
394 adjust_pc(regs, address);
395
396 ra = (insn >> 16) & 0x1f;
397 rb = (insn >> 11) & 0x1f;
398 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
399 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
400
401 if (!lwa_flag || vaddr != lwa_addr) {
402 regs->sr &= ~SPR_SR_F;
403 return;
404 }
405
406 if ((unsigned long)vaddr & 0x3) {
407 do_unaligned_access(regs, address);
408 return;
409 }
410
411 if (put_user(regs->gpr[rb], vaddr)) {
412 if (user_mode(regs)) {
413 force_sig(SIGSEGV);
414 return;
415 }
416
417 if ((entry = search_exception_tables(orig_pc))) {
418 regs->pc = entry->fixup;
419 return;
420 }
421
422 /* kernel access in kernel space, store it directly */
423 *((unsigned long *)vaddr) = regs->gpr[rb];
424 }
425
426 lwa_flag = 0;
427 regs->sr |= SPR_SR_F;
428 }
429
430 #define INSN_LWA 0x1b
431 #define INSN_SWA 0x33
432
433 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
434 unsigned long address)
435 {
436 unsigned int op;
437 unsigned int insn = *((unsigned int *)address);
438
439 op = insn >> 26;
440
441 switch (op) {
442 case INSN_LWA:
443 simulate_lwa(regs, address, insn);
444 return;
445
446 case INSN_SWA:
447 simulate_swa(regs, address, insn);
448 return;
449
450 default:
451 break;
452 }
453
454 if (user_mode(regs)) {
455 /* Send a SIGILL */
456 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
457 } else { /* Kernel mode */
458 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
459 address);
460 show_registers(regs);
461 die("Die:", regs, address);
462 }
463 }
Linux with added FPC-III support