1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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
44int kstack_depth_to_print = 0x180;
45int lwa_flag;
46unsigned long __user *lwa_addr;
47
48void 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
55void 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
64void show_trace_task(struct task_struct *tsk)
65{
66
67
68
69}
70
71void 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
107
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])) {
121bad:
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
135void 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
212void 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
222 local_irq_disable();
223
224 __asm__ __volatile__("l.nop 1");
225 do {} while (1);
226#endif
227 do_exit(SIGSEGV);
228}
229
230
231void 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
239void 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
246void __init trap_init(void)
247{
248
249}
250
251asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
252{
253 siginfo_t info;
254 memset(&info, 0, sizeof(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
263asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
264{
265 siginfo_t info;
266
267 if (user_mode(regs)) {
268
269 info.si_signo = SIGBUS;
270 info.si_errno = 0;
271 info.si_code = BUS_ADRALN;
272 info.si_addr = (void __user *)address;
273 force_sig_info(SIGBUS, &info, current);
274 } else {
275 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
276 show_registers(regs);
277 die("Die:", regs, address);
278 }
279
280}
281
282asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
283{
284 siginfo_t info;
285
286 if (user_mode(regs)) {
287
288 info.si_signo = SIGBUS;
289 info.si_errno = 0;
290 info.si_code = BUS_ADRERR;
291 info.si_addr = (void *)address;
292 force_sig_info(SIGBUS, &info, current);
293 } else {
294 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
295 show_registers(regs);
296 die("Die:", regs, address);
297 }
298}
299
300static inline int in_delay_slot(struct pt_regs *regs)
301{
302#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
303
304 unsigned int op, insn;
305
306 insn = *((unsigned int *)regs->pc);
307 op = insn >> 26;
308 switch (op) {
309 case 0x00:
310 case 0x01:
311 case 0x03:
312 case 0x04:
313 case 0x11:
314 case 0x12:
315 return 1;
316 default:
317 return 0;
318 }
319#else
320 return regs->sr & SPR_SR_DSX;
321#endif
322}
323
324static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
325{
326 int displacement;
327 unsigned int rb, op, jmp;
328
329 if (unlikely(in_delay_slot(regs))) {
330
331 jmp = *((unsigned int *)regs->pc);
332
333 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
334 rb = (jmp & 0x0000ffff) >> 11;
335 op = jmp >> 26;
336
337 switch (op) {
338 case 0x00:
339 regs->pc += displacement;
340 return;
341 case 0x01:
342 regs->pc += displacement;
343 regs->gpr[9] = regs->pc + 8;
344 return;
345 case 0x03:
346 if (regs->sr & SPR_SR_F)
347 regs->pc += 8;
348 else
349 regs->pc += displacement;
350 return;
351 case 0x04:
352 if (regs->sr & SPR_SR_F)
353 regs->pc += displacement;
354 else
355 regs->pc += 8;
356 return;
357 case 0x11:
358 regs->pc = regs->gpr[rb];
359 return;
360 case 0x12:
361 regs->pc = regs->gpr[rb];
362 regs->gpr[9] = regs->pc + 8;
363 return;
364 default:
365 break;
366 }
367 } else {
368 regs->pc += 4;
369 }
370}
371
372static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
373 unsigned int insn)
374{
375 unsigned int ra, rd;
376 unsigned long value;
377 unsigned long orig_pc;
378 long imm;
379
380 const struct exception_table_entry *entry;
381
382 orig_pc = regs->pc;
383 adjust_pc(regs, address);
384
385 ra = (insn >> 16) & 0x1f;
386 rd = (insn >> 21) & 0x1f;
387 imm = (short)insn;
388 lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
389
390 if ((unsigned long)lwa_addr & 0x3) {
391 do_unaligned_access(regs, address);
392 return;
393 }
394
395 if (get_user(value, lwa_addr)) {
396 if (user_mode(regs)) {
397 force_sig(SIGSEGV, current);
398 return;
399 }
400
401 if ((entry = search_exception_tables(orig_pc))) {
402 regs->pc = entry->fixup;
403 return;
404 }
405
406
407 value = *((unsigned long *)lwa_addr);
408 }
409
410 lwa_flag = 1;
411 regs->gpr[rd] = value;
412}
413
414static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
415 unsigned int insn)
416{
417 unsigned long __user *vaddr;
418 unsigned long orig_pc;
419 unsigned int ra, rb;
420 long imm;
421
422 const struct exception_table_entry *entry;
423
424 orig_pc = regs->pc;
425 adjust_pc(regs, address);
426
427 ra = (insn >> 16) & 0x1f;
428 rb = (insn >> 11) & 0x1f;
429 imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
430 vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
431
432 if (!lwa_flag || vaddr != lwa_addr) {
433 regs->sr &= ~SPR_SR_F;
434 return;
435 }
436
437 if ((unsigned long)vaddr & 0x3) {
438 do_unaligned_access(regs, address);
439 return;
440 }
441
442 if (put_user(regs->gpr[rb], vaddr)) {
443 if (user_mode(regs)) {
444 force_sig(SIGSEGV, current);
445 return;
446 }
447
448 if ((entry = search_exception_tables(orig_pc))) {
449 regs->pc = entry->fixup;
450 return;
451 }
452
453
454 *((unsigned long *)vaddr) = regs->gpr[rb];
455 }
456
457 lwa_flag = 0;
458 regs->sr |= SPR_SR_F;
459}
460
461#define INSN_LWA 0x1b
462#define INSN_SWA 0x33
463
464asmlinkage void do_illegal_instruction(struct pt_regs *regs,
465 unsigned long address)
466{
467 siginfo_t info;
468 unsigned int op;
469 unsigned int insn = *((unsigned int *)address);
470
471 op = insn >> 26;
472
473 switch (op) {
474 case INSN_LWA:
475 simulate_lwa(regs, address, insn);
476 return;
477
478 case INSN_SWA:
479 simulate_swa(regs, address, insn);
480 return;
481
482 default:
483 break;
484 }
485
486 if (user_mode(regs)) {
487
488 info.si_signo = SIGILL;
489 info.si_errno = 0;
490 info.si_code = ILL_ILLOPC;
491 info.si_addr = (void *)address;
492 force_sig_info(SIGBUS, &info, current);
493 } else {
494 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
495 address);
496 show_registers(regs);
497 die("Die:", regs, address);
498 }
499}
500
