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MN10300: Save frame pointer in thread_info struct rather than global var
[deliverable/linux.git] / arch / mn10300 / kernel / traps.c
1 /* MN10300 Exception handling
2 *
3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Modified by David Howells (dhowells@redhat.com)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public Licence
9 * as published by the Free Software Foundation; either version
10 * 2 of the Licence, or (at your option) any later version.
11 */
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/timer.h>
18 #include <linux/mm.h>
19 #include <linux/smp.h>
20 #include <linux/init.h>
21 #include <linux/delay.h>
22 #include <linux/spinlock.h>
23 #include <linux/interrupt.h>
24 #include <linux/kallsyms.h>
25 #include <linux/pci.h>
26 #include <linux/kdebug.h>
27 #include <linux/bug.h>
28 #include <linux/irq.h>
29 #include <asm/processor.h>
30 #include <asm/system.h>
31 #include <asm/uaccess.h>
32 #include <asm/io.h>
33 #include <asm/atomic.h>
34 #include <asm/smp.h>
35 #include <asm/pgalloc.h>
36 #include <asm/cacheflush.h>
37 #include <asm/cpu-regs.h>
38 #include <asm/busctl-regs.h>
39 #include <unit/leds.h>
40 #include <asm/fpu.h>
41 #include <asm/gdb-stub.h>
42 #include <asm/sections.h>
43
44 #if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
45 #error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
46 #endif
47
48 int kstack_depth_to_print = 24;
49
50 spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);
51
52 ATOMIC_NOTIFIER_HEAD(mn10300_die_chain);
53
54 /*
55 * These constants are for searching for possible module text
56 * segments. MODULE_RANGE is a guess of how much space is likely
57 * to be vmalloced.
58 */
59 #define MODULE_RANGE (8 * 1024 * 1024)
60
61 #define DO_ERROR(signr, prologue, str, name) \
62 asmlinkage void name(struct pt_regs *regs, u32 intcode) \
63 { \
64 prologue; \
65 if (die_if_no_fixup(str, regs, intcode)) \
66 return; \
67 force_sig(signr, current); \
68 }
69
70 #define DO_EINFO(signr, prologue, str, name, sicode) \
71 asmlinkage void name(struct pt_regs *regs, u32 intcode) \
72 { \
73 siginfo_t info; \
74 prologue; \
75 if (die_if_no_fixup(str, regs, intcode)) \
76 return; \
77 info.si_signo = signr; \
78 if (signr == SIGILL && sicode == ILL_ILLOPC) { \
79 uint8_t opcode; \
80 if (get_user(opcode, (uint8_t __user *)regs->pc) == 0) \
81 if (opcode == 0xff) \
82 info.si_signo = SIGTRAP; \
83 } \
84 info.si_errno = 0; \
85 info.si_code = sicode; \
86 info.si_addr = (void *) regs->pc; \
87 force_sig_info(info.si_signo, &info, current); \
88 }
89
90 DO_ERROR(SIGTRAP, {}, "trap", trap);
91 DO_ERROR(SIGSEGV, {}, "ibreak", ibreak);
92 DO_ERROR(SIGSEGV, {}, "obreak", obreak);
93 DO_EINFO(SIGSEGV, {}, "access error", access_error, SEGV_ACCERR);
94 DO_EINFO(SIGSEGV, {}, "insn access error", insn_acc_error, SEGV_ACCERR);
95 DO_EINFO(SIGSEGV, {}, "data access error", data_acc_error, SEGV_ACCERR);
96 DO_EINFO(SIGILL, {}, "privileged opcode", priv_op, ILL_PRVOPC);
97 DO_EINFO(SIGILL, {}, "invalid opcode", invalid_op, ILL_ILLOPC);
98 DO_EINFO(SIGILL, {}, "invalid ex opcode", invalid_exop, ILL_ILLOPC);
99 DO_EINFO(SIGBUS, {}, "invalid address", mem_error, BUS_ADRERR);
100 DO_EINFO(SIGBUS, {}, "bus error", bus_error, BUS_ADRERR);
101
102 DO_ERROR(SIGTRAP,
103 #ifndef CONFIG_MN10300_USING_JTAG
104 DCR &= ~0x0001,
105 #else
106 {},
107 #endif
108 "single step", istep);
109
110 /*
111 * handle NMI
112 */
113 asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
114 {
115 /* see if gdbstub wants to deal with it */
116 #ifdef CONFIG_GDBSTUB
117 if (gdbstub_intercept(regs, code))
118 return;
119 #endif
120
121 printk(KERN_WARNING "--- Register Dump ---\n");
122 show_registers(regs);
123 printk(KERN_WARNING "---------------------\n");
124 }
125
126 /*
127 * show a stack trace from the specified stack pointer
128 */
129 void show_trace(unsigned long *sp)
130 {
131 unsigned long *stack, addr, module_start, module_end;
132 int i;
133
134 printk(KERN_EMERG "\nCall Trace:");
135
136 stack = sp;
137 i = 0;
138 module_start = VMALLOC_START;
139 module_end = VMALLOC_END;
140
141 while (((long) stack & (THREAD_SIZE - 1)) != 0) {
142 addr = *stack++;
143 if (__kernel_text_address(addr)) {
144 #if 1
145 printk(" [<%08lx>]", addr);
146 print_symbol(" %s", addr);
147 printk("\n");
148 #else
149 if ((i % 6) == 0)
150 printk(KERN_EMERG " ");
151 printk("[<%08lx>] ", addr);
152 i++;
153 #endif
154 }
155 }
156
157 printk("\n");
158 }
159
160 /*
161 * show the raw stack from the specified stack pointer
162 */
163 void show_stack(struct task_struct *task, unsigned long *sp)
164 {
165 unsigned long *stack;
166 int i;
167
168 if (!sp)
169 sp = (unsigned long *) &sp;
170
171 stack = sp;
172 printk(KERN_EMERG "Stack:");
173 for (i = 0; i < kstack_depth_to_print; i++) {
174 if (((long) stack & (THREAD_SIZE - 1)) == 0)
175 break;
176 if ((i % 8) == 0)
177 printk(KERN_EMERG " ");
178 printk("%08lx ", *stack++);
179 }
180
181 show_trace(sp);
182 }
183
184 /*
185 * the architecture-independent dump_stack generator
186 */
187 void dump_stack(void)
188 {
189 unsigned long stack;
190
191 show_stack(current, &stack);
192 }
193 EXPORT_SYMBOL(dump_stack);
194
195 /*
196 * dump the register file in the specified exception frame
197 */
198 void show_registers_only(struct pt_regs *regs)
199 {
200 unsigned long ssp;
201
202 ssp = (unsigned long) regs + sizeof(*regs);
203
204 printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
205 regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
206 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
207 regs->d0, regs->d1, regs->d2, regs->d3);
208 printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
209 regs->a0, regs->a1, regs->a2, regs->a3);
210 printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
211 regs->e0, regs->e1, regs->e2, regs->e3);
212 printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
213 regs->e4, regs->e5, regs->e6, regs->e7);
214 printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
215 regs->lar, regs->lir, regs->mdr, regs->sp);
216 printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
217 regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
218 printk(KERN_EMERG "threadinfo=%p task=%p)\n",
219 current_thread_info(), current);
220
221 if ((unsigned long) current >= PAGE_OFFSET &&
222 (unsigned long) current < (unsigned long)high_memory)
223 printk(KERN_EMERG "Process %s (pid: %d)\n",
224 current->comm, current->pid);
225
226 #ifdef CONFIG_SMP
227 printk(KERN_EMERG "CPUID: %08x\n", CPUID);
228 #endif
229 printk(KERN_EMERG "CPUP: %04hx\n", CPUP);
230 printk(KERN_EMERG "TBR: %08x\n", TBR);
231 printk(KERN_EMERG "DEAR: %08x\n", DEAR);
232 printk(KERN_EMERG "sISR: %08x\n", sISR);
233 printk(KERN_EMERG "NMICR: %04hx\n", NMICR);
234 printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
235 printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
236 printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
237 printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2);
238 printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2);
239 }
240
241 /*
242 * dump the registers and the stack
243 */
244 void show_registers(struct pt_regs *regs)
245 {
246 unsigned long sp;
247 int i;
248
249 show_registers_only(regs);
250
251 if (!user_mode(regs))
252 sp = (unsigned long) regs + sizeof(*regs);
253 else
254 sp = regs->sp;
255
256 /* when in-kernel, we also print out the stack and code at the
257 * time of the fault..
258 */
259 if (!user_mode(regs)) {
260 printk(KERN_EMERG "\n");
261 show_stack(current, (unsigned long *) sp);
262
263 #if 0
264 printk(KERN_EMERG "\nCode: ");
265 if (regs->pc < PAGE_OFFSET)
266 goto bad;
267
268 for (i = 0; i < 20; i++) {
269 unsigned char c;
270 if (__get_user(c, &((unsigned char *) regs->pc)[i]))
271 goto bad;
272 printk("%02x ", c);
273 }
274 #else
275 i = 0;
276 #endif
277 }
278
279 printk("\n");
280 return;
281
282 #if 0
283 bad:
284 printk(KERN_EMERG " Bad PC value.");
285 break;
286 #endif
287 }
288
289 /*
290 *
291 */
292 void show_trace_task(struct task_struct *tsk)
293 {
294 unsigned long sp = tsk->thread.sp;
295
296 /* User space on another CPU? */
297 if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
298 return;
299
300 show_trace((unsigned long *) sp);
301 }
302
303 /*
304 * note the untimely death of part of the kernel
305 */
306 void die(const char *str, struct pt_regs *regs, enum exception_code code)
307 {
308 console_verbose();
309 spin_lock_irq(&die_lock);
310 printk(KERN_EMERG "\n%s: %04x\n",
311 str, code & 0xffff);
312 show_registers(regs);
313
314 if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
315 (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
316 printk(KERN_EMERG "Exception in usermode interrupt handler\n");
317 printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
318 asm volatile ("0: bra 0b");
319 }
320
321 spin_unlock_irq(&die_lock);
322 do_exit(SIGSEGV);
323 }
324
325 /*
326 * see if there's a fixup handler we can force a jump to when an exception
327 * happens due to something kernel code did
328 */
329 int die_if_no_fixup(const char *str, struct pt_regs *regs,
330 enum exception_code code)
331 {
332 if (user_mode(regs))
333 return 0;
334
335 peripheral_leds_display_exception(code);
336
337 switch (code) {
338 /* see if we can fixup the kernel accessing memory */
339 case EXCEP_ITLBMISS:
340 case EXCEP_DTLBMISS:
341 case EXCEP_IAERROR:
342 case EXCEP_DAERROR:
343 case EXCEP_MEMERR:
344 case EXCEP_MISALIGN:
345 case EXCEP_BUSERROR:
346 case EXCEP_ILLDATACC:
347 case EXCEP_IOINSACC:
348 case EXCEP_PRIVINSACC:
349 case EXCEP_PRIVDATACC:
350 case EXCEP_DATINSACC:
351 if (fixup_exception(regs))
352 return 1;
353 case EXCEP_UNIMPINS:
354 if (regs->pc && *(uint8_t *)regs->pc == 0xff)
355 if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
356 return 1;
357 break;
358 default:
359 break;
360 }
361
362 /* see if gdbstub wants to deal with it */
363 #ifdef CONFIG_GDBSTUB
364 if (gdbstub_intercept(regs, code))
365 return 1;
366 #endif
367
368 if (notify_die(DIE_GPF, str, regs, code, 0, 0))
369 return 1;
370
371 /* make the process die as the last resort */
372 die(str, regs, code);
373 }
374
375 /*
376 * handle unsupported syscall instructions (syscall 1-15)
377 */
378 static asmlinkage void unsupported_syscall(struct pt_regs *regs,
379 enum exception_code code)
380 {
381 struct task_struct *tsk = current;
382 siginfo_t info;
383
384 /* catch a kernel BUG() */
385 if (code == EXCEP_SYSCALL15 && !user_mode(regs)) {
386 if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_BUG) {
387 #ifdef CONFIG_GDBSTUB
388 gdbstub_intercept(regs, code);
389 #endif
390 }
391 }
392
393 regs->pc -= 2; /* syscall return addr is _after_ the instruction */
394
395 die_if_no_fixup("An unsupported syscall insn was used by the kernel\n",
396 regs, code);
397
398 info.si_signo = SIGILL;
399 info.si_errno = ENOSYS;
400 info.si_code = ILL_ILLTRP;
401 info.si_addr = (void *) regs->pc;
402 force_sig_info(SIGILL, &info, tsk);
403 }
404
405 /*
406 * display the register file when the stack pointer gets clobbered
407 */
408 asmlinkage void do_double_fault(struct pt_regs *regs)
409 {
410 struct task_struct *tsk = current;
411
412 strcpy(tsk->comm, "emergency tsk");
413 tsk->pid = 0;
414 console_verbose();
415 printk(KERN_EMERG "--- double fault ---\n");
416 show_registers(regs);
417 }
418
419 /*
420 * asynchronous bus error (external, usually I/O DMA)
421 */
422 asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
423 {
424 console_verbose();
425
426 printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
427 printk(KERN_EMERG "==========================\n");
428
429 if (bcberr & BCBERR_BEME)
430 printk(KERN_EMERG "- Multiple recorded errors\n");
431
432 printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
433 bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "",
434 bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "",
435 bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
436
437 printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
438 bcberr & BCBERR_BEBST ? "Burst" : "Single",
439 bcberr & BCBERR_BERW ? "Read" : "Write",
440 bcberr & BCBERR_BESB_MON ? "Monitor Space" :
441 bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" :
442 bcberr & BCBERR_BESB_EX ? "External I/O Bus" :
443 bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
444 "On Chip Memory",
445 bcbear
446 );
447
448 printk(KERN_EMERG "- Detected by the %s\n",
449 bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
450
451 #ifdef CONFIG_PCI
452 #define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X)))
453 #define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
454 #define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
455
456 printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n",
457 *(volatile __u32 *) (0xBFFFFFF4));
458 printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n",
459 BRIDGEREGL(PCI_BASE_ADDRESS_0));
460 printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
461 BRIDGEREGL(0x48));
462 printk(KERN_EMERG "- PCI Bridge Command: %04hx\n",
463 BRIDGEREGW(PCI_COMMAND));
464 printk(KERN_EMERG "- PCI Bridge Status: %04hx\n",
465 BRIDGEREGW(PCI_STATUS));
466 printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n",
467 BRIDGEREGL(0x4c));
468 #endif
469
470 printk(KERN_EMERG "\n");
471 show_registers(regs);
472
473 panic("Halted due to asynchronous I/O Bus Error\n");
474 }
475
476 /*
477 * handle an exception for which a handler has not yet been installed
478 */
479 asmlinkage void uninitialised_exception(struct pt_regs *regs,
480 enum exception_code code)
481 {
482
483 /* see if gdbstub wants to deal with it */
484 #ifdef CONFIG_GDBSTUB
485 if (gdbstub_intercept(regs, code))
486 return;
487 #endif
488
489 peripheral_leds_display_exception(code);
490 printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
491 show_registers(regs);
492
493 for (;;)
494 continue;
495 }
496
497 /*
498 * set an interrupt stub to jump to a handler
499 * ! NOTE: this does *not* flush the caches
500 */
501 void __init __set_intr_stub(enum exception_code code, void *handler)
502 {
503 unsigned long addr;
504 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
505
506 addr = (unsigned long) handler - (unsigned long) vector;
507 vector[0] = 0xdc; /* JMP handler */
508 vector[1] = addr;
509 vector[2] = addr >> 8;
510 vector[3] = addr >> 16;
511 vector[4] = addr >> 24;
512 vector[5] = 0xcb;
513 vector[6] = 0xcb;
514 vector[7] = 0xcb;
515 }
516
517 /*
518 * set an interrupt stub to jump to a handler
519 */
520 void __init set_intr_stub(enum exception_code code, void *handler)
521 {
522 unsigned long addr;
523 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
524 unsigned long flags;
525
526 addr = (unsigned long) handler - (unsigned long) vector;
527
528 flags = arch_local_cli_save();
529
530 vector[0] = 0xdc; /* JMP handler */
531 vector[1] = addr;
532 vector[2] = addr >> 8;
533 vector[3] = addr >> 16;
534 vector[4] = addr >> 24;
535 vector[5] = 0xcb;
536 vector[6] = 0xcb;
537 vector[7] = 0xcb;
538
539 arch_local_irq_restore(flags);
540
541 #ifndef CONFIG_MN10300_CACHE_SNOOP
542 mn10300_dcache_flush_inv();
543 mn10300_icache_inv();
544 #endif
545 }
546
547 /*
548 * initialise the exception table
549 */
550 void __init trap_init(void)
551 {
552 set_excp_vector(EXCEP_TRAP, trap);
553 set_excp_vector(EXCEP_ISTEP, istep);
554 set_excp_vector(EXCEP_IBREAK, ibreak);
555 set_excp_vector(EXCEP_OBREAK, obreak);
556
557 set_excp_vector(EXCEP_PRIVINS, priv_op);
558 set_excp_vector(EXCEP_UNIMPINS, invalid_op);
559 set_excp_vector(EXCEP_UNIMPEXINS, invalid_exop);
560 set_excp_vector(EXCEP_MEMERR, mem_error);
561 set_excp_vector(EXCEP_MISALIGN, misalignment);
562 set_excp_vector(EXCEP_BUSERROR, bus_error);
563 set_excp_vector(EXCEP_ILLINSACC, insn_acc_error);
564 set_excp_vector(EXCEP_ILLDATACC, data_acc_error);
565 set_excp_vector(EXCEP_IOINSACC, insn_acc_error);
566 set_excp_vector(EXCEP_PRIVINSACC, insn_acc_error);
567 set_excp_vector(EXCEP_PRIVDATACC, data_acc_error);
568 set_excp_vector(EXCEP_DATINSACC, insn_acc_error);
569 set_excp_vector(EXCEP_FPU_UNIMPINS, fpu_invalid_op);
570 set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);
571
572 set_excp_vector(EXCEP_NMI, nmi);
573
574 set_excp_vector(EXCEP_SYSCALL1, unsupported_syscall);
575 set_excp_vector(EXCEP_SYSCALL2, unsupported_syscall);
576 set_excp_vector(EXCEP_SYSCALL3, unsupported_syscall);
577 set_excp_vector(EXCEP_SYSCALL4, unsupported_syscall);
578 set_excp_vector(EXCEP_SYSCALL5, unsupported_syscall);
579 set_excp_vector(EXCEP_SYSCALL6, unsupported_syscall);
580 set_excp_vector(EXCEP_SYSCALL7, unsupported_syscall);
581 set_excp_vector(EXCEP_SYSCALL8, unsupported_syscall);
582 set_excp_vector(EXCEP_SYSCALL9, unsupported_syscall);
583 set_excp_vector(EXCEP_SYSCALL10, unsupported_syscall);
584 set_excp_vector(EXCEP_SYSCALL11, unsupported_syscall);
585 set_excp_vector(EXCEP_SYSCALL12, unsupported_syscall);
586 set_excp_vector(EXCEP_SYSCALL13, unsupported_syscall);
587 set_excp_vector(EXCEP_SYSCALL14, unsupported_syscall);
588 set_excp_vector(EXCEP_SYSCALL15, unsupported_syscall);
589 }
590
591 /*
592 * determine if a program counter value is a valid bug address
593 */
594 int is_valid_bugaddr(unsigned long pc)
595 {
596 return pc >= PAGE_OFFSET;
597 }
Linux kernel - Deliverables
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