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