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TOMOYO Linux Cross Reference
Linux/arch/openrisc/kernel/traps.c

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  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         force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address, current);
254 
255         regs->pc += 4;
256 }
257 
258 asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
259 {
260         if (user_mode(regs)) {
261                 /* Send a SIGBUS */
262                 force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address, current);
263         } else {
264                 printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
265                 show_registers(regs);
266                 die("Die:", regs, address);
267         }
268 
269 }
270 
271 asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
272 {
273         if (user_mode(regs)) {
274                 /* Send a SIGBUS */
275                 force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address, current);
276         } else {                /* Kernel mode */
277                 printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
278                 show_registers(regs);
279                 die("Die:", regs, address);
280         }
281 }
282 
283 static inline int in_delay_slot(struct pt_regs *regs)
284 {
285 #ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
286         /* No delay slot flag, do the old way */
287         unsigned int op, insn;
288 
289         insn = *((unsigned int *)regs->pc);
290         op = insn >> 26;
291         switch (op) {
292         case 0x00: /* l.j */
293         case 0x01: /* l.jal */
294         case 0x03: /* l.bnf */
295         case 0x04: /* l.bf */
296         case 0x11: /* l.jr */
297         case 0x12: /* l.jalr */
298                 return 1;
299         default:
300                 return 0;
301         }
302 #else
303         return mfspr(SPR_SR) & SPR_SR_DSX;
304 #endif
305 }
306 
307 static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
308 {
309         int displacement;
310         unsigned int rb, op, jmp;
311 
312         if (unlikely(in_delay_slot(regs))) {
313                 /* In delay slot, instruction at pc is a branch, simulate it */
314                 jmp = *((unsigned int *)regs->pc);
315 
316                 displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
317                 rb = (jmp & 0x0000ffff) >> 11;
318                 op = jmp >> 26;
319 
320                 switch (op) {
321                 case 0x00: /* l.j */
322                         regs->pc += displacement;
323                         return;
324                 case 0x01: /* l.jal */
325                         regs->pc += displacement;
326                         regs->gpr[9] = regs->pc + 8;
327                         return;
328                 case 0x03: /* l.bnf */
329                         if (regs->sr & SPR_SR_F)
330                                 regs->pc += 8;
331                         else
332                                 regs->pc += displacement;
333                         return;
334                 case 0x04: /* l.bf */
335                         if (regs->sr & SPR_SR_F)
336                                 regs->pc += displacement;
337                         else
338                                 regs->pc += 8;
339                         return;
340                 case 0x11: /* l.jr */
341                         regs->pc = regs->gpr[rb];
342                         return;
343                 case 0x12: /* l.jalr */
344                         regs->pc = regs->gpr[rb];
345                         regs->gpr[9] = regs->pc + 8;
346                         return;
347                 default:
348                         break;
349                 }
350         } else {
351                 regs->pc += 4;
352         }
353 }
354 
355 static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
356                                 unsigned int insn)
357 {
358         unsigned int ra, rd;
359         unsigned long value;
360         unsigned long orig_pc;
361         long imm;
362 
363         const struct exception_table_entry *entry;
364 
365         orig_pc = regs->pc;
366         adjust_pc(regs, address);
367 
368         ra = (insn >> 16) & 0x1f;
369         rd = (insn >> 21) & 0x1f;
370         imm = (short)insn;
371         lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
372 
373         if ((unsigned long)lwa_addr & 0x3) {
374                 do_unaligned_access(regs, address);
375                 return;
376         }
377 
378         if (get_user(value, lwa_addr)) {
379                 if (user_mode(regs)) {
380                         force_sig(SIGSEGV, current);
381                         return;
382                 }
383 
384                 if ((entry = search_exception_tables(orig_pc))) {
385                         regs->pc = entry->fixup;
386                         return;
387                 }
388 
389                 /* kernel access in kernel space, load it directly */
390                 value = *((unsigned long *)lwa_addr);
391         }
392 
393         lwa_flag = 1;
394         regs->gpr[rd] = value;
395 }
396 
397 static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
398                                 unsigned int insn)
399 {
400         unsigned long __user *vaddr;
401         unsigned long orig_pc;
402         unsigned int ra, rb;
403         long imm;
404 
405         const struct exception_table_entry *entry;
406 
407         orig_pc = regs->pc;
408         adjust_pc(regs, address);
409 
410         ra = (insn >> 16) & 0x1f;
411         rb = (insn >> 11) & 0x1f;
412         imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
413         vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
414 
415         if (!lwa_flag || vaddr != lwa_addr) {
416                 regs->sr &= ~SPR_SR_F;
417                 return;
418         }
419 
420         if ((unsigned long)vaddr & 0x3) {
421                 do_unaligned_access(regs, address);
422                 return;
423         }
424 
425         if (put_user(regs->gpr[rb], vaddr)) {
426                 if (user_mode(regs)) {
427                         force_sig(SIGSEGV, current);
428                         return;
429                 }
430 
431                 if ((entry = search_exception_tables(orig_pc))) {
432                         regs->pc = entry->fixup;
433                         return;
434                 }
435 
436                 /* kernel access in kernel space, store it directly */
437                 *((unsigned long *)vaddr) = regs->gpr[rb];
438         }
439 
440         lwa_flag = 0;
441         regs->sr |= SPR_SR_F;
442 }
443 
444 #define INSN_LWA        0x1b
445 #define INSN_SWA        0x33
446 
447 asmlinkage void do_illegal_instruction(struct pt_regs *regs,
448                                        unsigned long address)
449 {
450         unsigned int op;
451         unsigned int insn = *((unsigned int *)address);
452 
453         op = insn >> 26;
454 
455         switch (op) {
456         case INSN_LWA:
457                 simulate_lwa(regs, address, insn);
458                 return;
459 
460         case INSN_SWA:
461                 simulate_swa(regs, address, insn);
462                 return;
463 
464         default:
465                 break;
466         }
467 
468         if (user_mode(regs)) {
469                 /* Send a SIGILL */
470                 force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address, current);
471         } else {                /* Kernel mode */
472                 printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
473                        address);
474                 show_registers(regs);
475                 die("Die:", regs, address);
476         }
477 }
478 

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