projects / deliverable / linux.git / blob
? search:


d279552fe9b01633738880454872ce4e581dc03f
[deliverable/linux.git] / arch / blackfin / kernel / traps.c
1 /*
2 * File: arch/blackfin/kernel/traps.c
3 * Based on:
4 * Author: Hamish Macdonald
5 *
6 * Created:
7 * Description: uses S/W interrupt 15 for the system calls
8 *
9 * Modified:
10 * Copyright 2004-2006 Analog Devices Inc.
11 *
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
28 */
29
30 #include <linux/bug.h>
31 #include <linux/uaccess.h>
32 #include <linux/interrupt.h>
33 #include <linux/module.h>
34 #include <linux/kallsyms.h>
35 #include <linux/fs.h>
36 #include <linux/rbtree.h>
37 #include <asm/traps.h>
38 #include <asm/cacheflush.h>
39 #include <asm/cplb.h>
40 #include <asm/blackfin.h>
41 #include <asm/irq_handler.h>
42 #include <linux/irq.h>
43 #include <asm/trace.h>
44 #include <asm/fixed_code.h>
45
46 #ifdef CONFIG_KGDB
47 # include <linux/kgdb.h>
48
49 # define CHK_DEBUGGER_TRAP() \
50 do { \
51 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
52 } while (0)
53 # define CHK_DEBUGGER_TRAP_MAYBE() \
54 do { \
55 if (kgdb_connected) \
56 CHK_DEBUGGER_TRAP(); \
57 } while (0)
58 #else
59 # define CHK_DEBUGGER_TRAP() do { } while (0)
60 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
61 #endif
62
63
64 #ifdef CONFIG_DEBUG_VERBOSE
65 #define verbose_printk(fmt, arg...) \
66 printk(fmt, ##arg)
67 #else
68 #define verbose_printk(fmt, arg...) \
69 ({ if (0) printk(fmt, ##arg); 0; })
70 #endif
71
72 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
73 u32 last_seqstat;
74 #ifdef CONFIG_DEBUG_MMRS_MODULE
75 EXPORT_SYMBOL(last_seqstat);
76 #endif
77 #endif
78
79 /* Initiate the event table handler */
80 void __init trap_init(void)
81 {
82 CSYNC();
83 bfin_write_EVT3(trap);
84 CSYNC();
85 }
86
87 static void decode_address(char *buf, unsigned long address)
88 {
89 #ifdef CONFIG_DEBUG_VERBOSE
90 struct task_struct *p;
91 struct mm_struct *mm;
92 unsigned long flags, offset;
93 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
94 struct rb_node *n;
95
96 #ifdef CONFIG_KALLSYMS
97 unsigned long symsize;
98 const char *symname;
99 char *modname;
100 char *delim = ":";
101 char namebuf[128];
102
103 /* look up the address and see if we are in kernel space */
104 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
105
106 if (symname) {
107 /* yeah! kernel space! */
108 if (!modname)
109 modname = delim = "";
110 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
111 (void *)address, delim, modname, delim, symname,
112 (unsigned long)offset);
113 return;
114
115 }
116 #endif
117
118 /* Problem in fixed code section? */
119 if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
120 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
121 return;
122 }
123
124 /* Problem somewhere before the kernel start address */
125 if (address < CONFIG_BOOT_LOAD) {
126 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
127 return;
128 }
129
130 /* looks like we're off in user-land, so let's walk all the
131 * mappings of all our processes and see if we can't be a whee
132 * bit more specific
133 */
134 write_lock_irqsave(&tasklist_lock, flags);
135 for_each_process(p) {
136 mm = (in_atomic ? p->mm : get_task_mm(p));
137 if (!mm)
138 continue;
139
140 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
141 struct vm_area_struct *vma;
142
143 vma = rb_entry(n, struct vm_area_struct, vm_rb);
144
145 if (address >= vma->vm_start && address < vma->vm_end) {
146 char _tmpbuf[256];
147 char *name = p->comm;
148 struct file *file = vma->vm_file;
149
150 if (file) {
151 char *d_name = d_path(&file->f_path, _tmpbuf,
152 sizeof(_tmpbuf));
153 if (!IS_ERR(d_name))
154 name = d_name;
155 }
156
157 /* FLAT does not have its text aligned to the start of
158 * the map while FDPIC ELF does ...
159 */
160
161 /* before we can check flat/fdpic, we need to
162 * make sure current is valid
163 */
164 if ((unsigned long)current >= FIXED_CODE_START &&
165 !((unsigned long)current & 0x3)) {
166 if (current->mm &&
167 (address > current->mm->start_code) &&
168 (address < current->mm->end_code))
169 offset = address - current->mm->start_code;
170 else
171 offset = (address - vma->vm_start) +
172 (vma->vm_pgoff << PAGE_SHIFT);
173
174 sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
175 (void *)address, name, offset);
176 } else
177 sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
178 (void *)address, name,
179 vma->vm_start, vma->vm_end);
180
181 if (!in_atomic)
182 mmput(mm);
183
184 if (!strlen(buf))
185 sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
186
187 goto done;
188 }
189 }
190 if (!in_atomic)
191 mmput(mm);
192 }
193
194 /* we were unable to find this address anywhere */
195 sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
196
197 done:
198 write_unlock_irqrestore(&tasklist_lock, flags);
199 #else
200 sprintf(buf, " ");
201 #endif
202 }
203
204 asmlinkage void double_fault_c(struct pt_regs *fp)
205 {
206 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
207 int j;
208 trace_buffer_save(j);
209 #endif
210
211 console_verbose();
212 oops_in_progress = 1;
213 #ifdef CONFIG_DEBUG_VERBOSE
214 printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
215 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
216 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
217 unsigned int cpu = smp_processor_id();
218 char buf[150];
219 decode_address(buf, cpu_pda[cpu].retx);
220 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
221 (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
222 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
223 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
224 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
225 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
226
227 decode_address(buf, fp->retx);
228 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
229 } else
230 #endif
231 {
232 dump_bfin_process(fp);
233 dump_bfin_mem(fp);
234 show_regs(fp);
235 dump_bfin_trace_buffer();
236 }
237 #endif
238 panic("Double Fault - unrecoverable event");
239
240 }
241
242 static int kernel_mode_regs(struct pt_regs *regs)
243 {
244 return regs->ipend & 0xffc0;
245 }
246
247 asmlinkage void trap_c(struct pt_regs *fp)
248 {
249 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
250 int j;
251 #endif
252 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
253 unsigned int cpu = smp_processor_id();
254 #endif
255 const char *strerror = NULL;
256 int sig = 0;
257 siginfo_t info;
258 unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
259
260 trace_buffer_save(j);
261 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
262 last_seqstat = (u32)fp->seqstat;
263 #endif
264
265 /* Important - be very careful dereferncing pointers - will lead to
266 * double faults if the stack has become corrupt
267 */
268
269 #ifndef CONFIG_KGDB
270 /* IPEND is skipped if KGDB isn't enabled (see entry code) */
271 fp->ipend = bfin_read_IPEND();
272 #endif
273
274 /* trap_c() will be called for exceptions. During exceptions
275 * processing, the pc value should be set with retx value.
276 * With this change we can cleanup some code in signal.c- TODO
277 */
278 fp->orig_pc = fp->retx;
279 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
280 trapnr, fp->ipend, fp->pc, fp->retx); */
281
282 /* send the appropriate signal to the user program */
283 switch (trapnr) {
284
285 /* This table works in conjuction with the one in ./mach-common/entry.S
286 * Some exceptions are handled there (in assembly, in exception space)
287 * Some are handled here, (in C, in interrupt space)
288 * Some, like CPLB, are handled in both, where the normal path is
289 * handled in assembly/exception space, and the error path is handled
290 * here
291 */
292
293 /* 0x00 - Linux Syscall, getting here is an error */
294 /* 0x01 - userspace gdb breakpoint, handled here */
295 case VEC_EXCPT01:
296 info.si_code = TRAP_ILLTRAP;
297 sig = SIGTRAP;
298 CHK_DEBUGGER_TRAP_MAYBE();
299 /* Check if this is a breakpoint in kernel space */
300 if (kernel_mode_regs(fp))
301 goto traps_done;
302 else
303 break;
304 /* 0x03 - User Defined, userspace stack overflow */
305 case VEC_EXCPT03:
306 info.si_code = SEGV_STACKFLOW;
307 sig = SIGSEGV;
308 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
309 CHK_DEBUGGER_TRAP_MAYBE();
310 break;
311 /* 0x02 - KGDB initial connection and break signal trap */
312 case VEC_EXCPT02:
313 #ifdef CONFIG_KGDB
314 info.si_code = TRAP_ILLTRAP;
315 sig = SIGTRAP;
316 CHK_DEBUGGER_TRAP();
317 goto traps_done;
318 #endif
319 /* 0x04 - User Defined */
320 /* 0x05 - User Defined */
321 /* 0x06 - User Defined */
322 /* 0x07 - User Defined */
323 /* 0x08 - User Defined */
324 /* 0x09 - User Defined */
325 /* 0x0A - User Defined */
326 /* 0x0B - User Defined */
327 /* 0x0C - User Defined */
328 /* 0x0D - User Defined */
329 /* 0x0E - User Defined */
330 /* 0x0F - User Defined */
331 /* If we got here, it is most likely that someone was trying to use a
332 * custom exception handler, and it is not actually installed properly
333 */
334 case VEC_EXCPT04 ... VEC_EXCPT15:
335 info.si_code = ILL_ILLPARAOP;
336 sig = SIGILL;
337 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
338 CHK_DEBUGGER_TRAP_MAYBE();
339 break;
340 /* 0x10 HW Single step, handled here */
341 case VEC_STEP:
342 info.si_code = TRAP_STEP;
343 sig = SIGTRAP;
344 CHK_DEBUGGER_TRAP_MAYBE();
345 /* Check if this is a single step in kernel space */
346 if (kernel_mode_regs(fp))
347 goto traps_done;
348 else
349 break;
350 /* 0x11 - Trace Buffer Full, handled here */
351 case VEC_OVFLOW:
352 info.si_code = TRAP_TRACEFLOW;
353 sig = SIGTRAP;
354 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
355 CHK_DEBUGGER_TRAP_MAYBE();
356 break;
357 /* 0x12 - Reserved, Caught by default */
358 /* 0x13 - Reserved, Caught by default */
359 /* 0x14 - Reserved, Caught by default */
360 /* 0x15 - Reserved, Caught by default */
361 /* 0x16 - Reserved, Caught by default */
362 /* 0x17 - Reserved, Caught by default */
363 /* 0x18 - Reserved, Caught by default */
364 /* 0x19 - Reserved, Caught by default */
365 /* 0x1A - Reserved, Caught by default */
366 /* 0x1B - Reserved, Caught by default */
367 /* 0x1C - Reserved, Caught by default */
368 /* 0x1D - Reserved, Caught by default */
369 /* 0x1E - Reserved, Caught by default */
370 /* 0x1F - Reserved, Caught by default */
371 /* 0x20 - Reserved, Caught by default */
372 /* 0x21 - Undefined Instruction, handled here */
373 case VEC_UNDEF_I:
374 #ifdef CONFIG_BUG
375 if (kernel_mode_regs(fp)) {
376 switch (report_bug(fp->pc, fp)) {
377 case BUG_TRAP_TYPE_NONE:
378 break;
379 case BUG_TRAP_TYPE_WARN:
380 dump_bfin_trace_buffer();
381 fp->pc += 2;
382 goto traps_done;
383 case BUG_TRAP_TYPE_BUG:
384 /* call to panic() will dump trace, and it is
385 * off at this point, so it won't be clobbered
386 */
387 panic("BUG()");
388 }
389 }
390 #endif
391 info.si_code = ILL_ILLOPC;
392 sig = SIGILL;
393 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
394 CHK_DEBUGGER_TRAP_MAYBE();
395 break;
396 /* 0x22 - Illegal Instruction Combination, handled here */
397 case VEC_ILGAL_I:
398 info.si_code = ILL_ILLPARAOP;
399 sig = SIGILL;
400 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
401 CHK_DEBUGGER_TRAP_MAYBE();
402 break;
403 /* 0x23 - Data CPLB protection violation, handled here */
404 case VEC_CPLB_VL:
405 info.si_code = ILL_CPLB_VI;
406 sig = SIGBUS;
407 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
408 CHK_DEBUGGER_TRAP_MAYBE();
409 break;
410 /* 0x24 - Data access misaligned, handled here */
411 case VEC_MISALI_D:
412 info.si_code = BUS_ADRALN;
413 sig = SIGBUS;
414 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
415 CHK_DEBUGGER_TRAP_MAYBE();
416 break;
417 /* 0x25 - Unrecoverable Event, handled here */
418 case VEC_UNCOV:
419 info.si_code = ILL_ILLEXCPT;
420 sig = SIGILL;
421 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
422 CHK_DEBUGGER_TRAP_MAYBE();
423 break;
424 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
425 error case is handled here */
426 case VEC_CPLB_M:
427 info.si_code = BUS_ADRALN;
428 sig = SIGBUS;
429 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
430 break;
431 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
432 case VEC_CPLB_MHIT:
433 info.si_code = ILL_CPLB_MULHIT;
434 sig = SIGSEGV;
435 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
436 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
437 strerror = KERN_NOTICE "NULL pointer access\n";
438 else
439 #endif
440 strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
441 CHK_DEBUGGER_TRAP_MAYBE();
442 break;
443 /* 0x28 - Emulation Watchpoint, handled here */
444 case VEC_WATCH:
445 info.si_code = TRAP_WATCHPT;
446 sig = SIGTRAP;
447 pr_debug(EXC_0x28(KERN_DEBUG));
448 CHK_DEBUGGER_TRAP_MAYBE();
449 /* Check if this is a watchpoint in kernel space */
450 if (kernel_mode_regs(fp))
451 goto traps_done;
452 else
453 break;
454 #ifdef CONFIG_BF535
455 /* 0x29 - Instruction fetch access error (535 only) */
456 case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
457 info.si_code = BUS_OPFETCH;
458 sig = SIGBUS;
459 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
460 CHK_DEBUGGER_TRAP_MAYBE();
461 break;
462 #else
463 /* 0x29 - Reserved, Caught by default */
464 #endif
465 /* 0x2A - Instruction fetch misaligned, handled here */
466 case VEC_MISALI_I:
467 info.si_code = BUS_ADRALN;
468 sig = SIGBUS;
469 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
470 CHK_DEBUGGER_TRAP_MAYBE();
471 break;
472 /* 0x2B - Instruction CPLB protection violation, handled here */
473 case VEC_CPLB_I_VL:
474 info.si_code = ILL_CPLB_VI;
475 sig = SIGBUS;
476 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
477 CHK_DEBUGGER_TRAP_MAYBE();
478 break;
479 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
480 case VEC_CPLB_I_M:
481 info.si_code = ILL_CPLB_MISS;
482 sig = SIGBUS;
483 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
484 break;
485 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
486 case VEC_CPLB_I_MHIT:
487 info.si_code = ILL_CPLB_MULHIT;
488 sig = SIGSEGV;
489 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
490 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
491 strerror = KERN_NOTICE "Jump to NULL address\n";
492 else
493 #endif
494 strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
495 CHK_DEBUGGER_TRAP_MAYBE();
496 break;
497 /* 0x2E - Illegal use of Supervisor Resource, handled here */
498 case VEC_ILL_RES:
499 info.si_code = ILL_PRVOPC;
500 sig = SIGILL;
501 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
502 CHK_DEBUGGER_TRAP_MAYBE();
503 break;
504 /* 0x2F - Reserved, Caught by default */
505 /* 0x30 - Reserved, Caught by default */
506 /* 0x31 - Reserved, Caught by default */
507 /* 0x32 - Reserved, Caught by default */
508 /* 0x33 - Reserved, Caught by default */
509 /* 0x34 - Reserved, Caught by default */
510 /* 0x35 - Reserved, Caught by default */
511 /* 0x36 - Reserved, Caught by default */
512 /* 0x37 - Reserved, Caught by default */
513 /* 0x38 - Reserved, Caught by default */
514 /* 0x39 - Reserved, Caught by default */
515 /* 0x3A - Reserved, Caught by default */
516 /* 0x3B - Reserved, Caught by default */
517 /* 0x3C - Reserved, Caught by default */
518 /* 0x3D - Reserved, Caught by default */
519 /* 0x3E - Reserved, Caught by default */
520 /* 0x3F - Reserved, Caught by default */
521 case VEC_HWERR:
522 info.si_code = BUS_ADRALN;
523 sig = SIGBUS;
524 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
525 /* System MMR Error */
526 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
527 info.si_code = BUS_ADRALN;
528 sig = SIGBUS;
529 strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
530 break;
531 /* External Memory Addressing Error */
532 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
533 info.si_code = BUS_ADRERR;
534 sig = SIGBUS;
535 strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
536 break;
537 /* Performance Monitor Overflow */
538 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
539 strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
540 break;
541 /* RAISE 5 instruction */
542 case (SEQSTAT_HWERRCAUSE_RAISE_5):
543 printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
544 break;
545 default: /* Reserved */
546 printk(KERN_NOTICE HWC_default(KERN_NOTICE));
547 break;
548 }
549 CHK_DEBUGGER_TRAP_MAYBE();
550 break;
551 /*
552 * We should be handling all known exception types above,
553 * if we get here we hit a reserved one, so panic
554 */
555 default:
556 info.si_code = ILL_ILLPARAOP;
557 sig = SIGILL;
558 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
559 (fp->seqstat & SEQSTAT_EXCAUSE));
560 CHK_DEBUGGER_TRAP_MAYBE();
561 break;
562 }
563
564 BUG_ON(sig == 0);
565
566 /* If the fault was caused by a kernel thread, or interrupt handler
567 * we will kernel panic, so the system reboots.
568 */
569 if (kernel_mode_regs(fp) || (current && !current->mm)) {
570 console_verbose();
571 oops_in_progress = 1;
572 if (strerror)
573 verbose_printk(strerror);
574 }
575
576 if (sig != SIGTRAP) {
577 dump_bfin_process(fp);
578 dump_bfin_mem(fp);
579 show_regs(fp);
580
581 /* Print out the trace buffer if it makes sense */
582 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
583 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
584 verbose_printk(KERN_NOTICE "No trace since you do not have "
585 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
586 KERN_NOTICE "\n");
587 else
588 #endif
589 dump_bfin_trace_buffer();
590
591 if (oops_in_progress) {
592 /* Dump the current kernel stack */
593 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
594 show_stack(current, NULL);
595 print_modules();
596 #ifndef CONFIG_ACCESS_CHECK
597 verbose_printk(KERN_EMERG "Please turn on "
598 "CONFIG_ACCESS_CHECK\n");
599 #endif
600 panic("Kernel exception");
601 } else {
602 #ifdef CONFIG_DEBUG_VERBOSE
603 unsigned long *stack;
604 /* Dump the user space stack */
605 stack = (unsigned long *)rdusp();
606 verbose_printk(KERN_NOTICE "Userspace Stack\n");
607 show_stack(NULL, stack);
608 #endif
609 }
610 }
611
612 #ifdef CONFIG_IPIPE
613 if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
614 #endif
615 {
616 info.si_signo = sig;
617 info.si_errno = 0;
618 info.si_addr = (void __user *)fp->pc;
619 force_sig_info(sig, &info, current);
620 }
621
622 if (ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8))
623 fp->pc = SAFE_USER_INSTRUCTION;
624
625 traps_done:
626 trace_buffer_restore(j);
627 }
628
629 /* Typical exception handling routines */
630
631 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
632
633 /*
634 * Similar to get_user, do some address checking, then dereference
635 * Return true on sucess, false on bad address
636 */
637 static bool get_instruction(unsigned short *val, unsigned short *address)
638 {
639
640 unsigned long addr;
641
642 addr = (unsigned long)address;
643
644 /* Check for odd addresses */
645 if (addr & 0x1)
646 return false;
647
648 /* Check that things do not wrap around */
649 if (addr > (addr + 2))
650 return false;
651
652 /*
653 * Since we are in exception context, we need to do a little address checking
654 * We need to make sure we are only accessing valid memory, and
655 * we don't read something in the async space that can hang forever
656 */
657 if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
658 #if L2_LENGTH != 0
659 (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
660 #endif
661 (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
662 #if L1_DATA_A_LENGTH != 0
663 (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
664 #endif
665 #if L1_DATA_B_LENGTH != 0
666 (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
667 #endif
668 (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
669 (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
670 addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
671 (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
672 addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
673 (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
674 addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
675 (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
676 addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
677 *val = *address;
678 return true;
679 }
680
681 #if L1_CODE_LENGTH != 0
682 if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
683 isram_memcpy(val, address, 2);
684 return true;
685 }
686 #endif
687
688
689 return false;
690 }
691
692 /*
693 * decode the instruction if we are printing out the trace, as it
694 * makes things easier to follow, without running it through objdump
695 * These are the normal instructions which cause change of flow, which
696 * would be at the source of the trace buffer
697 */
698 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
699 static void decode_instruction(unsigned short *address)
700 {
701 unsigned short opcode;
702
703 if (get_instruction(&opcode, address)) {
704 if (opcode == 0x0010)
705 verbose_printk("RTS");
706 else if (opcode == 0x0011)
707 verbose_printk("RTI");
708 else if (opcode == 0x0012)
709 verbose_printk("RTX");
710 else if (opcode == 0x0013)
711 verbose_printk("RTN");
712 else if (opcode == 0x0014)
713 verbose_printk("RTE");
714 else if (opcode == 0x0025)
715 verbose_printk("EMUEXCPT");
716 else if (opcode == 0x0040 && opcode <= 0x0047)
717 verbose_printk("STI R%i", opcode & 7);
718 else if (opcode >= 0x0050 && opcode <= 0x0057)
719 verbose_printk("JUMP (P%i)", opcode & 7);
720 else if (opcode >= 0x0060 && opcode <= 0x0067)
721 verbose_printk("CALL (P%i)", opcode & 7);
722 else if (opcode >= 0x0070 && opcode <= 0x0077)
723 verbose_printk("CALL (PC+P%i)", opcode & 7);
724 else if (opcode >= 0x0080 && opcode <= 0x0087)
725 verbose_printk("JUMP (PC+P%i)", opcode & 7);
726 else if (opcode >= 0x0090 && opcode <= 0x009F)
727 verbose_printk("RAISE 0x%x", opcode & 0xF);
728 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
729 verbose_printk("EXCPT 0x%x", opcode & 0xF);
730 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
731 verbose_printk("IF !CC JUMP");
732 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
733 verbose_printk("IF CC JUMP");
734 else if (opcode >= 0x2000 && opcode <= 0x2fff)
735 verbose_printk("JUMP.S");
736 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
737 verbose_printk("LSETUP");
738 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
739 verbose_printk("JUMP.L");
740 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
741 verbose_printk("CALL pcrel");
742 else
743 verbose_printk("0x%04x", opcode);
744 }
745
746 }
747 #endif
748
749 void dump_bfin_trace_buffer(void)
750 {
751 #ifdef CONFIG_DEBUG_VERBOSE
752 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
753 int tflags, i = 0;
754 char buf[150];
755 unsigned short *addr;
756 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
757 int j, index;
758 #endif
759
760 trace_buffer_save(tflags);
761
762 printk(KERN_NOTICE "Hardware Trace:\n");
763
764 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
765 printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
766 #endif
767
768 if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
769 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
770 decode_address(buf, (unsigned long)bfin_read_TBUF());
771 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
772 addr = (unsigned short *)bfin_read_TBUF();
773 decode_address(buf, (unsigned long)addr);
774 printk(KERN_NOTICE " Source : %s ", buf);
775 decode_instruction(addr);
776 printk("\n");
777 }
778 }
779
780 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
781 if (trace_buff_offset)
782 index = trace_buff_offset / 4;
783 else
784 index = EXPAND_LEN;
785
786 j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
787 while (j) {
788 decode_address(buf, software_trace_buff[index]);
789 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
790 index -= 1;
791 if (index < 0 )
792 index = EXPAND_LEN;
793 decode_address(buf, software_trace_buff[index]);
794 printk(KERN_NOTICE " Source : %s ", buf);
795 decode_instruction((unsigned short *)software_trace_buff[index]);
796 printk("\n");
797 index -= 1;
798 if (index < 0)
799 index = EXPAND_LEN;
800 j--;
801 i++;
802 }
803 #endif
804
805 trace_buffer_restore(tflags);
806 #endif
807 #endif
808 }
809 EXPORT_SYMBOL(dump_bfin_trace_buffer);
810
811 #ifdef CONFIG_BUG
812 int is_valid_bugaddr(unsigned long addr)
813 {
814 unsigned short opcode;
815
816 if (!get_instruction(&opcode, (unsigned short *)addr))
817 return 0;
818
819 return opcode == BFIN_BUG_OPCODE;
820 }
821 #endif
822
823 /*
824 * Checks to see if the address pointed to is either a
825 * 16-bit CALL instruction, or a 32-bit CALL instruction
826 */
827 static bool is_bfin_call(unsigned short *addr)
828 {
829 unsigned short opcode = 0, *ins_addr;
830 ins_addr = (unsigned short *)addr;
831
832 if (!get_instruction(&opcode, ins_addr))
833 return false;
834
835 if ((opcode >= 0x0060 && opcode <= 0x0067) ||
836 (opcode >= 0x0070 && opcode <= 0x0077))
837 return true;
838
839 ins_addr--;
840 if (!get_instruction(&opcode, ins_addr))
841 return false;
842
843 if (opcode >= 0xE300 && opcode <= 0xE3FF)
844 return true;
845
846 return false;
847
848 }
849
850 void show_stack(struct task_struct *task, unsigned long *stack)
851 {
852 #ifdef CONFIG_PRINTK
853 unsigned int *addr, *endstack, *fp = 0, *frame;
854 unsigned short *ins_addr;
855 char buf[150];
856 unsigned int i, j, ret_addr, frame_no = 0;
857
858 /*
859 * If we have been passed a specific stack, use that one otherwise
860 * if we have been passed a task structure, use that, otherwise
861 * use the stack of where the variable "stack" exists
862 */
863
864 if (stack == NULL) {
865 if (task) {
866 /* We know this is a kernel stack, so this is the start/end */
867 stack = (unsigned long *)task->thread.ksp;
868 endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
869 } else {
870 /* print out the existing stack info */
871 stack = (unsigned long *)&stack;
872 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
873 }
874 } else
875 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
876
877 printk(KERN_NOTICE "Stack info:\n");
878 decode_address(buf, (unsigned int)stack);
879 printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
880
881 if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
882 printk(KERN_NOTICE "Invalid stack pointer\n");
883 return;
884 }
885
886 /* First thing is to look for a frame pointer */
887 for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
888 if (*addr & 0x1)
889 continue;
890 ins_addr = (unsigned short *)*addr;
891 ins_addr--;
892 if (is_bfin_call(ins_addr))
893 fp = addr - 1;
894
895 if (fp) {
896 /* Let's check to see if it is a frame pointer */
897 while (fp >= (addr - 1) && fp < endstack
898 && fp && ((unsigned int) fp & 0x3) == 0)
899 fp = (unsigned int *)*fp;
900 if (fp == 0 || fp == endstack) {
901 fp = addr - 1;
902 break;
903 }
904 fp = 0;
905 }
906 }
907 if (fp) {
908 frame = fp;
909 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
910 } else
911 frame = 0;
912
913 /*
914 * Now that we think we know where things are, we
915 * walk the stack again, this time printing things out
916 * incase there is no frame pointer, we still look for
917 * valid return addresses
918 */
919
920 /* First time print out data, next time, print out symbols */
921 for (j = 0; j <= 1; j++) {
922 if (j)
923 printk(KERN_NOTICE "Return addresses in stack:\n");
924 else
925 printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
926
927 fp = frame;
928 frame_no = 0;
929
930 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
931 addr <= endstack; addr++, i++) {
932
933 ret_addr = 0;
934 if (!j && i % 8 == 0)
935 printk("\n" KERN_NOTICE "%p:",addr);
936
937 /* if it is an odd address, or zero, just skip it */
938 if (*addr & 0x1 || !*addr)
939 goto print;
940
941 ins_addr = (unsigned short *)*addr;
942
943 /* Go back one instruction, and see if it is a CALL */
944 ins_addr--;
945 ret_addr = is_bfin_call(ins_addr);
946 print:
947 if (!j && stack == (unsigned long *)addr)
948 printk("[%08x]", *addr);
949 else if (ret_addr)
950 if (j) {
951 decode_address(buf, (unsigned int)*addr);
952 if (frame == addr) {
953 printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
954 continue;
955 }
956 printk(KERN_NOTICE " address : %s\n", buf);
957 } else
958 printk("<%08x>", *addr);
959 else if (fp == addr) {
960 if (j)
961 frame = addr+1;
962 else
963 printk("(%08x)", *addr);
964
965 fp = (unsigned int *)*addr;
966 frame_no++;
967
968 } else if (!j)
969 printk(" %08x ", *addr);
970 }
971 if (!j)
972 printk("\n");
973 }
974 #endif
975 }
976
977 void dump_stack(void)
978 {
979 unsigned long stack;
980 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
981 int tflags;
982 #endif
983 trace_buffer_save(tflags);
984 dump_bfin_trace_buffer();
985 show_stack(current, &stack);
986 trace_buffer_restore(tflags);
987 }
988 EXPORT_SYMBOL(dump_stack);
989
990 void dump_bfin_process(struct pt_regs *fp)
991 {
992 #ifdef CONFIG_DEBUG_VERBOSE
993 /* We should be able to look at fp->ipend, but we don't push it on the
994 * stack all the time, so do this until we fix that */
995 unsigned int context = bfin_read_IPEND();
996
997 if (oops_in_progress)
998 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
999
1000 if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
1001 verbose_printk(KERN_NOTICE "HW Error context\n");
1002 else if (context & 0x0020)
1003 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
1004 else if (context & 0x3FC0)
1005 verbose_printk(KERN_NOTICE "Interrupt context\n");
1006 else if (context & 0x4000)
1007 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
1008 else if (context & 0x8000)
1009 verbose_printk(KERN_NOTICE "Kernel process context\n");
1010
1011 /* Because we are crashing, and pointers could be bad, we check things
1012 * pretty closely before we use them
1013 */
1014 if ((unsigned long)current >= FIXED_CODE_START &&
1015 !((unsigned long)current & 0x3) && current->pid) {
1016 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
1017 if (current->comm >= (char *)FIXED_CODE_START)
1018 verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
1019 current->comm, current->pid);
1020 else
1021 verbose_printk(KERN_NOTICE "COMM= invalid\n");
1022
1023 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
1024 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
1025 verbose_printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
1026 KERN_NOTICE " BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
1027 KERN_NOTICE "\n",
1028 (void *)current->mm->start_code,
1029 (void *)current->mm->end_code,
1030 (void *)current->mm->start_data,
1031 (void *)current->mm->end_data,
1032 (void *)current->mm->end_data,
1033 (void *)current->mm->brk,
1034 (void *)current->mm->start_stack);
1035 else
1036 verbose_printk(KERN_NOTICE "invalid mm\n");
1037 } else
1038 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
1039 "No Valid process in current context\n");
1040 #endif
1041 }
1042
1043 void dump_bfin_mem(struct pt_regs *fp)
1044 {
1045 #ifdef CONFIG_DEBUG_VERBOSE
1046 unsigned short *addr, *erraddr, val = 0, err = 0;
1047 char sti = 0, buf[6];
1048
1049 erraddr = (void *)fp->pc;
1050
1051 verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1052
1053 for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1054 addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1055 addr++) {
1056 if (!((unsigned long)addr & 0xF))
1057 verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
1058
1059 if (!get_instruction(&val, addr)) {
1060 val = 0;
1061 sprintf(buf, "????");
1062 } else
1063 sprintf(buf, "%04x", val);
1064
1065 if (addr == erraddr) {
1066 verbose_printk("[%s]", buf);
1067 err = val;
1068 } else
1069 verbose_printk(" %s ", buf);
1070
1071 /* Do any previous instructions turn on interrupts? */
1072 if (addr <= erraddr && /* in the past */
1073 ((val >= 0x0040 && val <= 0x0047) || /* STI instruction */
1074 val == 0x017b)) /* [SP++] = RETI */
1075 sti = 1;
1076 }
1077
1078 verbose_printk("\n");
1079
1080 /* Hardware error interrupts can be deferred */
1081 if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1082 oops_in_progress)){
1083 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1084 #ifndef CONFIG_DEBUG_HWERR
1085 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1086 KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1087 " better idea where it came from\n");
1088 #else
1089 /* If we are handling only one peripheral interrupt
1090 * and current mm and pid are valid, and the last error
1091 * was in that user space process's text area
1092 * print it out - because that is where the problem exists
1093 */
1094 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1095 (current->pid && current->mm)) {
1096 /* And the last RETI points to the current userspace context */
1097 if ((fp + 1)->pc >= current->mm->start_code &&
1098 (fp + 1)->pc <= current->mm->end_code) {
1099 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1100 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1101 show_regs(fp + 1);
1102 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1103 }
1104 }
1105 #endif
1106 }
1107 #endif
1108 }
1109
1110 void show_regs(struct pt_regs *fp)
1111 {
1112 #ifdef CONFIG_DEBUG_VERBOSE
1113 char buf [150];
1114 struct irqaction *action;
1115 unsigned int i;
1116 unsigned long flags = 0;
1117 unsigned int cpu = smp_processor_id();
1118 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1119
1120 verbose_printk(KERN_NOTICE "\n");
1121 if (CPUID != bfin_cpuid())
1122 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1123 "but running on:0x%04x (Rev %d)\n",
1124 CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1125
1126 verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1127 CPU, bfin_compiled_revid());
1128
1129 if (bfin_compiled_revid() != bfin_revid())
1130 verbose_printk("(Detected 0.%d)", bfin_revid());
1131
1132 verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1133 get_cclk()/1000000, get_sclk()/1000000,
1134 #ifdef CONFIG_MPU
1135 "mpu on"
1136 #else
1137 "mpu off"
1138 #endif
1139 );
1140
1141 verbose_printk(KERN_NOTICE "%s", linux_banner);
1142
1143 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1144 verbose_printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
1145 (long)fp->seqstat, fp->ipend, fp->syscfg);
1146 if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1147 verbose_printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
1148 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1149 #ifdef EBIU_ERRMST
1150 /* If the error was from the EBIU, print it out */
1151 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1152 verbose_printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n",
1153 bfin_read_EBIU_ERRMST());
1154 verbose_printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n",
1155 bfin_read_EBIU_ERRADD());
1156 }
1157 #endif
1158 }
1159 verbose_printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
1160 fp->seqstat & SEQSTAT_EXCAUSE);
1161 for (i = 2; i <= 15 ; i++) {
1162 if (fp->ipend & (1 << i)) {
1163 if (i != 4) {
1164 decode_address(buf, bfin_read32(EVT0 + 4*i));
1165 verbose_printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf);
1166 } else
1167 verbose_printk(KERN_NOTICE " interrupts disabled\n");
1168 }
1169 }
1170
1171 /* if no interrupts are going off, don't print this out */
1172 if (fp->ipend & ~0x3F) {
1173 for (i = 0; i < (NR_IRQS - 1); i++) {
1174 if (!in_atomic)
1175 spin_lock_irqsave(&irq_desc[i].lock, flags);
1176
1177 action = irq_desc[i].action;
1178 if (!action)
1179 goto unlock;
1180
1181 decode_address(buf, (unsigned int)action->handler);
1182 verbose_printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf);
1183 for (action = action->next; action; action = action->next) {
1184 decode_address(buf, (unsigned int)action->handler);
1185 verbose_printk(", %s", buf);
1186 }
1187 verbose_printk("\n");
1188 unlock:
1189 if (!in_atomic)
1190 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1191 }
1192 }
1193
1194 decode_address(buf, fp->rete);
1195 verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1196 decode_address(buf, fp->retn);
1197 verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1198 decode_address(buf, fp->retx);
1199 verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1200 decode_address(buf, fp->rets);
1201 verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1202 decode_address(buf, fp->pc);
1203 verbose_printk(KERN_NOTICE " PC : %s\n", buf);
1204
1205 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
1206 (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1207 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1208 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1209 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1210 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1211 }
1212
1213 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1214 verbose_printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
1215 fp->r0, fp->r1, fp->r2, fp->r3);
1216 verbose_printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
1217 fp->r4, fp->r5, fp->r6, fp->r7);
1218 verbose_printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
1219 fp->p0, fp->p1, fp->p2, fp->p3);
1220 verbose_printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
1221 fp->p4, fp->p5, fp->fp, (long)fp);
1222 verbose_printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n",
1223 fp->lb0, fp->lt0, fp->lc0);
1224 verbose_printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n",
1225 fp->lb1, fp->lt1, fp->lc1);
1226 verbose_printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
1227 fp->b0, fp->l0, fp->m0, fp->i0);
1228 verbose_printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
1229 fp->b1, fp->l1, fp->m1, fp->i1);
1230 verbose_printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
1231 fp->b2, fp->l2, fp->m2, fp->i2);
1232 verbose_printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
1233 fp->b3, fp->l3, fp->m3, fp->i3);
1234 verbose_printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
1235 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1236
1237 verbose_printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n",
1238 rdusp(), fp->astat);
1239
1240 verbose_printk(KERN_NOTICE "\n");
1241 #endif
1242 }
1243
1244 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1245 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1246 #endif
1247
1248 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1249
1250 asmlinkage int sys_bfin_spinlock(int *p)
1251 {
1252 int ret, tmp = 0;
1253
1254 spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1255 ret = get_user(tmp, p);
1256 if (likely(ret == 0)) {
1257 if (unlikely(tmp))
1258 ret = 1;
1259 else
1260 put_user(1, p);
1261 }
1262 spin_unlock(&bfin_spinlock_lock);
1263 return ret;
1264 }
1265
1266 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1267 {
1268 void (*curr_handler)(void);
1269
1270 if (exception > 0x3F)
1271 return -EINVAL;
1272
1273 curr_handler = ex_table[exception];
1274
1275 if (curr_handler != ex_replaceable)
1276 return -EBUSY;
1277
1278 ex_table[exception] = handler;
1279
1280 return 0;
1281 }
1282 EXPORT_SYMBOL(bfin_request_exception);
1283
1284 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1285 {
1286 void (*curr_handler)(void);
1287
1288 if (exception > 0x3F)
1289 return -EINVAL;
1290
1291 curr_handler = ex_table[exception];
1292
1293 if (curr_handler != handler)
1294 return -EBUSY;
1295
1296 ex_table[exception] = ex_replaceable;
1297
1298 return 0;
1299 }
1300 EXPORT_SYMBOL(bfin_free_exception);
1301
1302 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1303 {
1304 switch (cplb_panic) {
1305 case CPLB_NO_UNLOCKED:
1306 printk(KERN_EMERG "All CPLBs are locked\n");
1307 break;
1308 case CPLB_PROT_VIOL:
1309 return;
1310 case CPLB_NO_ADDR_MATCH:
1311 return;
1312 case CPLB_UNKNOWN_ERR:
1313 printk(KERN_EMERG "Unknown CPLB Exception\n");
1314 break;
1315 }
1316
1317 oops_in_progress = 1;
1318
1319 dump_bfin_process(fp);
1320 dump_bfin_mem(fp);
1321 show_regs(fp);
1322 dump_stack();
1323 panic("Unrecoverable event");
1324 }
Linux kernel - Deliverables
This page took 0.174194 seconds and 4 git commands to generate.