Blackfin: don't walk VMAs when oopsing
[linux-2.6.git] / arch / blackfin / kernel / traps.c
1 /*
2  * Copyright 2004-2009 Analog Devices Inc.
3  *
4  * Licensed under the GPL-2 or later
5  */
6
7 #include <linux/bug.h>
8 #include <linux/uaccess.h>
9 #include <linux/interrupt.h>
10 #include <linux/module.h>
11 #include <linux/kallsyms.h>
12 #include <linux/fs.h>
13 #include <linux/rbtree.h>
14 #include <asm/traps.h>
15 #include <asm/cacheflush.h>
16 #include <asm/cplb.h>
17 #include <asm/dma.h>
18 #include <asm/blackfin.h>
19 #include <asm/irq_handler.h>
20 #include <linux/irq.h>
21 #include <asm/trace.h>
22 #include <asm/fixed_code.h>
23
24 #ifdef CONFIG_KGDB
25 # include <linux/kgdb.h>
26
27 # define CHK_DEBUGGER_TRAP() \
28         do { \
29                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
30         } while (0)
31 # define CHK_DEBUGGER_TRAP_MAYBE() \
32         do { \
33                 if (kgdb_connected) \
34                         CHK_DEBUGGER_TRAP(); \
35         } while (0)
36 #else
37 # define CHK_DEBUGGER_TRAP() do { } while (0)
38 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
39 #endif
40
41
42 #ifdef CONFIG_DEBUG_VERBOSE
43 #define verbose_printk(fmt, arg...) \
44         printk(fmt, ##arg)
45 #else
46 #define verbose_printk(fmt, arg...) \
47         ({ if (0) printk(fmt, ##arg); 0; })
48 #endif
49
50 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
51 u32 last_seqstat;
52 #ifdef CONFIG_DEBUG_MMRS_MODULE
53 EXPORT_SYMBOL(last_seqstat);
54 #endif
55 #endif
56
57 /* Initiate the event table handler */
58 void __init trap_init(void)
59 {
60         CSYNC();
61         bfin_write_EVT3(trap);
62         CSYNC();
63 }
64
65 static void decode_address(char *buf, unsigned long address)
66 {
67 #ifdef CONFIG_DEBUG_VERBOSE
68         struct task_struct *p;
69         struct mm_struct *mm;
70         unsigned long flags, offset;
71         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
72         struct rb_node *n;
73
74 #ifdef CONFIG_KALLSYMS
75         unsigned long symsize;
76         const char *symname;
77         char *modname;
78         char *delim = ":";
79         char namebuf[128];
80 #endif
81
82         buf += sprintf(buf, "<0x%08lx> ", address);
83
84 #ifdef CONFIG_KALLSYMS
85         /* look up the address and see if we are in kernel space */
86         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
87
88         if (symname) {
89                 /* yeah! kernel space! */
90                 if (!modname)
91                         modname = delim = "";
92                 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
93                         delim, modname, delim, symname,
94                         (unsigned long)offset);
95                 return;
96         }
97 #endif
98
99         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
100                 /* Problem in fixed code section? */
101                 strcat(buf, "/* Maybe fixed code section */");
102                 return;
103
104         } else if (address < CONFIG_BOOT_LOAD) {
105                 /* Problem somewhere before the kernel start address */
106                 strcat(buf, "/* Maybe null pointer? */");
107                 return;
108
109         } else if (address >= COREMMR_BASE) {
110                 strcat(buf, "/* core mmrs */");
111                 return;
112
113         } else if (address >= SYSMMR_BASE) {
114                 strcat(buf, "/* system mmrs */");
115                 return;
116
117         } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
118                 strcat(buf, "/* on-chip L1 ROM */");
119                 return;
120         }
121
122         /*
123          * Don't walk any of the vmas if we are oopsing, it has been known
124          * to cause problems - corrupt vmas (kernel crashes) cause double faults
125          */
126         if (oops_in_progress) {
127                 strcat(buf, "/* kernel dynamic memory (maybe user-space) */");
128                 return;
129         }
130
131         /* looks like we're off in user-land, so let's walk all the
132          * mappings of all our processes and see if we can't be a whee
133          * bit more specific
134          */
135         write_lock_irqsave(&tasklist_lock, flags);
136         for_each_process(p) {
137                 mm = (in_atomic ? p->mm : get_task_mm(p));
138                 if (!mm)
139                         continue;
140
141                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
142                         struct vm_area_struct *vma;
143
144                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
145
146                         if (address >= vma->vm_start && address < vma->vm_end) {
147                                 char _tmpbuf[256];
148                                 char *name = p->comm;
149                                 struct file *file = vma->vm_file;
150
151                                 if (file) {
152                                         char *d_name = d_path(&file->f_path, _tmpbuf,
153                                                       sizeof(_tmpbuf));
154                                         if (!IS_ERR(d_name))
155                                                 name = d_name;
156                                 }
157
158                                 /* FLAT does not have its text aligned to the start of
159                                  * the map while FDPIC ELF does ...
160                                  */
161
162                                 /* before we can check flat/fdpic, we need to
163                                  * make sure current is valid
164                                  */
165                                 if ((unsigned long)current >= FIXED_CODE_START &&
166                                     !((unsigned long)current & 0x3)) {
167                                         if (current->mm &&
168                                             (address > current->mm->start_code) &&
169                                             (address < current->mm->end_code))
170                                                 offset = address - current->mm->start_code;
171                                         else
172                                                 offset = (address - vma->vm_start) +
173                                                          (vma->vm_pgoff << PAGE_SHIFT);
174
175                                         sprintf(buf, "[ %s + 0x%lx ]", name, offset);
176                                 } else
177                                         sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
178                                                 name, vma->vm_start, vma->vm_end);
179
180                                 if (!in_atomic)
181                                         mmput(mm);
182
183                                 if (buf[0] == '\0')
184                                         sprintf(buf, "[ %s ] dynamic memory", name);
185
186                                 goto done;
187                         }
188                 }
189                 if (!in_atomic)
190                         mmput(mm);
191         }
192
193         /* we were unable to find this address anywhere */
194         sprintf(buf, "/* kernel dynamic memory */");
195
196 done:
197         write_unlock_irqrestore(&tasklist_lock, flags);
198 #else
199         sprintf(buf, " ");
200 #endif
201 }
202
203 asmlinkage void double_fault_c(struct pt_regs *fp)
204 {
205 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
206         int j;
207         trace_buffer_save(j);
208 #endif
209
210         console_verbose();
211         oops_in_progress = 1;
212 #ifdef CONFIG_DEBUG_VERBOSE
213         printk(KERN_EMERG "Double Fault\n");
214 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
215         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
216                 unsigned int cpu = raw_smp_processor_id();
217                 char buf[150];
218                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
219                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
220                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
221                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
222                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
223                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
224                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
225
226                 decode_address(buf, fp->retx);
227                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
228         } else
229 #endif
230         {
231                 dump_bfin_process(fp);
232                 dump_bfin_mem(fp);
233                 show_regs(fp);
234                 dump_bfin_trace_buffer();
235         }
236 #endif
237         panic("Double Fault - unrecoverable event");
238
239 }
240
241 static int kernel_mode_regs(struct pt_regs *regs)
242 {
243         return regs->ipend & 0xffc0;
244 }
245
246 asmlinkage notrace void trap_c(struct pt_regs *fp)
247 {
248 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
249         int j;
250 #endif
251 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
252         unsigned int cpu = raw_smp_processor_id();
253 #endif
254         const char *strerror = NULL;
255         int sig = 0;
256         siginfo_t info;
257         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
258
259         trace_buffer_save(j);
260 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
261         last_seqstat = (u32)fp->seqstat;
262 #endif
263
264         /* Important - be very careful dereferncing pointers - will lead to
265          * double faults if the stack has become corrupt
266          */
267
268         /* trap_c() will be called for exceptions. During exceptions
269          * processing, the pc value should be set with retx value.
270          * With this change we can cleanup some code in signal.c- TODO
271          */
272         fp->orig_pc = fp->retx;
273         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
274                 trapnr, fp->ipend, fp->pc, fp->retx); */
275
276         /* send the appropriate signal to the user program */
277         switch (trapnr) {
278
279         /* This table works in conjuction with the one in ./mach-common/entry.S
280          * Some exceptions are handled there (in assembly, in exception space)
281          * Some are handled here, (in C, in interrupt space)
282          * Some, like CPLB, are handled in both, where the normal path is
283          * handled in assembly/exception space, and the error path is handled
284          * here
285          */
286
287         /* 0x00 - Linux Syscall, getting here is an error */
288         /* 0x01 - userspace gdb breakpoint, handled here */
289         case VEC_EXCPT01:
290                 info.si_code = TRAP_ILLTRAP;
291                 sig = SIGTRAP;
292                 CHK_DEBUGGER_TRAP_MAYBE();
293                 /* Check if this is a breakpoint in kernel space */
294                 if (kernel_mode_regs(fp))
295                         goto traps_done;
296                 else
297                         break;
298         /* 0x03 - User Defined, userspace stack overflow */
299         case VEC_EXCPT03:
300                 info.si_code = SEGV_STACKFLOW;
301                 sig = SIGSEGV;
302                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
303                 CHK_DEBUGGER_TRAP_MAYBE();
304                 break;
305         /* 0x02 - KGDB initial connection and break signal trap */
306         case VEC_EXCPT02:
307 #ifdef CONFIG_KGDB
308                 info.si_code = TRAP_ILLTRAP;
309                 sig = SIGTRAP;
310                 CHK_DEBUGGER_TRAP();
311                 goto traps_done;
312 #endif
313         /* 0x04 - User Defined */
314         /* 0x05 - User Defined */
315         /* 0x06 - User Defined */
316         /* 0x07 - User Defined */
317         /* 0x08 - User Defined */
318         /* 0x09 - User Defined */
319         /* 0x0A - User Defined */
320         /* 0x0B - User Defined */
321         /* 0x0C - User Defined */
322         /* 0x0D - User Defined */
323         /* 0x0E - User Defined */
324         /* 0x0F - User Defined */
325         /* If we got here, it is most likely that someone was trying to use a
326          * custom exception handler, and it is not actually installed properly
327          */
328         case VEC_EXCPT04 ... VEC_EXCPT15:
329                 info.si_code = ILL_ILLPARAOP;
330                 sig = SIGILL;
331                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
332                 CHK_DEBUGGER_TRAP_MAYBE();
333                 break;
334         /* 0x10 HW Single step, handled here */
335         case VEC_STEP:
336                 info.si_code = TRAP_STEP;
337                 sig = SIGTRAP;
338                 CHK_DEBUGGER_TRAP_MAYBE();
339                 /* Check if this is a single step in kernel space */
340                 if (kernel_mode_regs(fp))
341                         goto traps_done;
342                 else
343                         break;
344         /* 0x11 - Trace Buffer Full, handled here */
345         case VEC_OVFLOW:
346                 info.si_code = TRAP_TRACEFLOW;
347                 sig = SIGTRAP;
348                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
349                 CHK_DEBUGGER_TRAP_MAYBE();
350                 break;
351         /* 0x12 - Reserved, Caught by default */
352         /* 0x13 - Reserved, Caught by default */
353         /* 0x14 - Reserved, Caught by default */
354         /* 0x15 - Reserved, Caught by default */
355         /* 0x16 - Reserved, Caught by default */
356         /* 0x17 - Reserved, Caught by default */
357         /* 0x18 - Reserved, Caught by default */
358         /* 0x19 - Reserved, Caught by default */
359         /* 0x1A - Reserved, Caught by default */
360         /* 0x1B - Reserved, Caught by default */
361         /* 0x1C - Reserved, Caught by default */
362         /* 0x1D - Reserved, Caught by default */
363         /* 0x1E - Reserved, Caught by default */
364         /* 0x1F - Reserved, Caught by default */
365         /* 0x20 - Reserved, Caught by default */
366         /* 0x21 - Undefined Instruction, handled here */
367         case VEC_UNDEF_I:
368 #ifdef CONFIG_BUG
369                 if (kernel_mode_regs(fp)) {
370                         switch (report_bug(fp->pc, fp)) {
371                         case BUG_TRAP_TYPE_NONE:
372                                 break;
373                         case BUG_TRAP_TYPE_WARN:
374                                 dump_bfin_trace_buffer();
375                                 fp->pc += 2;
376                                 goto traps_done;
377                         case BUG_TRAP_TYPE_BUG:
378                                 /* call to panic() will dump trace, and it is
379                                  * off at this point, so it won't be clobbered
380                                  */
381                                 panic("BUG()");
382                         }
383                 }
384 #endif
385                 info.si_code = ILL_ILLOPC;
386                 sig = SIGILL;
387                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
388                 CHK_DEBUGGER_TRAP_MAYBE();
389                 break;
390         /* 0x22 - Illegal Instruction Combination, handled here */
391         case VEC_ILGAL_I:
392                 info.si_code = ILL_ILLPARAOP;
393                 sig = SIGILL;
394                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
395                 CHK_DEBUGGER_TRAP_MAYBE();
396                 break;
397         /* 0x23 - Data CPLB protection violation, handled here */
398         case VEC_CPLB_VL:
399                 info.si_code = ILL_CPLB_VI;
400                 sig = SIGSEGV;
401                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
402                 CHK_DEBUGGER_TRAP_MAYBE();
403                 break;
404         /* 0x24 - Data access misaligned, handled here */
405         case VEC_MISALI_D:
406                 info.si_code = BUS_ADRALN;
407                 sig = SIGBUS;
408                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
409                 CHK_DEBUGGER_TRAP_MAYBE();
410                 break;
411         /* 0x25 - Unrecoverable Event, handled here */
412         case VEC_UNCOV:
413                 info.si_code = ILL_ILLEXCPT;
414                 sig = SIGILL;
415                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
416                 CHK_DEBUGGER_TRAP_MAYBE();
417                 break;
418         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
419                 error case is handled here */
420         case VEC_CPLB_M:
421                 info.si_code = BUS_ADRALN;
422                 sig = SIGBUS;
423                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
424                 break;
425         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
426         case VEC_CPLB_MHIT:
427                 info.si_code = ILL_CPLB_MULHIT;
428                 sig = SIGSEGV;
429 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
430                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
431                         strerror = KERN_NOTICE "NULL pointer access\n";
432                 else
433 #endif
434                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
435                 CHK_DEBUGGER_TRAP_MAYBE();
436                 break;
437         /* 0x28 - Emulation Watchpoint, handled here */
438         case VEC_WATCH:
439                 info.si_code = TRAP_WATCHPT;
440                 sig = SIGTRAP;
441                 pr_debug(EXC_0x28(KERN_DEBUG));
442                 CHK_DEBUGGER_TRAP_MAYBE();
443                 /* Check if this is a watchpoint in kernel space */
444                 if (kernel_mode_regs(fp))
445                         goto traps_done;
446                 else
447                         break;
448 #ifdef CONFIG_BF535
449         /* 0x29 - Instruction fetch access error (535 only) */
450         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
451                 info.si_code = BUS_OPFETCH;
452                 sig = SIGBUS;
453                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
454                 CHK_DEBUGGER_TRAP_MAYBE();
455                 break;
456 #else
457         /* 0x29 - Reserved, Caught by default */
458 #endif
459         /* 0x2A - Instruction fetch misaligned, handled here */
460         case VEC_MISALI_I:
461                 info.si_code = BUS_ADRALN;
462                 sig = SIGBUS;
463                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
464                 CHK_DEBUGGER_TRAP_MAYBE();
465                 break;
466         /* 0x2B - Instruction CPLB protection violation, handled here */
467         case VEC_CPLB_I_VL:
468                 info.si_code = ILL_CPLB_VI;
469                 sig = SIGBUS;
470                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
471                 CHK_DEBUGGER_TRAP_MAYBE();
472                 break;
473         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
474         case VEC_CPLB_I_M:
475                 info.si_code = ILL_CPLB_MISS;
476                 sig = SIGBUS;
477                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
478                 break;
479         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
480         case VEC_CPLB_I_MHIT:
481                 info.si_code = ILL_CPLB_MULHIT;
482                 sig = SIGSEGV;
483 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
484                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
485                         strerror = KERN_NOTICE "Jump to NULL address\n";
486                 else
487 #endif
488                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
489                 CHK_DEBUGGER_TRAP_MAYBE();
490                 break;
491         /* 0x2E - Illegal use of Supervisor Resource, handled here */
492         case VEC_ILL_RES:
493                 info.si_code = ILL_PRVOPC;
494                 sig = SIGILL;
495                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
496                 CHK_DEBUGGER_TRAP_MAYBE();
497                 break;
498         /* 0x2F - Reserved, Caught by default */
499         /* 0x30 - Reserved, Caught by default */
500         /* 0x31 - Reserved, Caught by default */
501         /* 0x32 - Reserved, Caught by default */
502         /* 0x33 - Reserved, Caught by default */
503         /* 0x34 - Reserved, Caught by default */
504         /* 0x35 - Reserved, Caught by default */
505         /* 0x36 - Reserved, Caught by default */
506         /* 0x37 - Reserved, Caught by default */
507         /* 0x38 - Reserved, Caught by default */
508         /* 0x39 - Reserved, Caught by default */
509         /* 0x3A - Reserved, Caught by default */
510         /* 0x3B - Reserved, Caught by default */
511         /* 0x3C - Reserved, Caught by default */
512         /* 0x3D - Reserved, Caught by default */
513         /* 0x3E - Reserved, Caught by default */
514         /* 0x3F - Reserved, Caught by default */
515         case VEC_HWERR:
516                 info.si_code = BUS_ADRALN;
517                 sig = SIGBUS;
518                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
519                 /* System MMR Error */
520                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
521                         info.si_code = BUS_ADRALN;
522                         sig = SIGBUS;
523                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
524                         break;
525                 /* External Memory Addressing Error */
526                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
527                         info.si_code = BUS_ADRERR;
528                         sig = SIGBUS;
529                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
530                         break;
531                 /* Performance Monitor Overflow */
532                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
533                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
534                         break;
535                 /* RAISE 5 instruction */
536                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
537                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
538                         break;
539                 default:        /* Reserved */
540                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
541                         break;
542                 }
543                 CHK_DEBUGGER_TRAP_MAYBE();
544                 break;
545         /*
546          * We should be handling all known exception types above,
547          * if we get here we hit a reserved one, so panic
548          */
549         default:
550                 info.si_code = ILL_ILLPARAOP;
551                 sig = SIGILL;
552                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
553                         (fp->seqstat & SEQSTAT_EXCAUSE));
554                 CHK_DEBUGGER_TRAP_MAYBE();
555                 break;
556         }
557
558         BUG_ON(sig == 0);
559
560         /* If the fault was caused by a kernel thread, or interrupt handler
561          * we will kernel panic, so the system reboots.
562          */
563         if (kernel_mode_regs(fp) || (current && !current->mm)) {
564                 console_verbose();
565                 oops_in_progress = 1;
566         }
567
568         if (sig != SIGTRAP) {
569                 if (strerror)
570                         verbose_printk(strerror);
571
572                 dump_bfin_process(fp);
573                 dump_bfin_mem(fp);
574                 show_regs(fp);
575
576                 /* Print out the trace buffer if it makes sense */
577 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
578                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
579                         verbose_printk(KERN_NOTICE "No trace since you do not have "
580                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
581                 else
582 #endif
583                         dump_bfin_trace_buffer();
584
585                 if (oops_in_progress) {
586                         /* Dump the current kernel stack */
587                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
588                         show_stack(current, NULL);
589                         print_modules();
590 #ifndef CONFIG_ACCESS_CHECK
591                         verbose_printk(KERN_EMERG "Please turn on "
592                                "CONFIG_ACCESS_CHECK\n");
593 #endif
594                         panic("Kernel exception");
595                 } else {
596 #ifdef CONFIG_DEBUG_VERBOSE
597                         unsigned long *stack;
598                         /* Dump the user space stack */
599                         stack = (unsigned long *)rdusp();
600                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
601                         show_stack(NULL, stack);
602 #endif
603                 }
604         }
605
606 #ifdef CONFIG_IPIPE
607         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
608 #endif
609         {
610                 info.si_signo = sig;
611                 info.si_errno = 0;
612                 info.si_addr = (void __user *)fp->pc;
613                 force_sig_info(sig, &info, current);
614         }
615
616         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
617             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
618             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
619                 fp->pc = SAFE_USER_INSTRUCTION;
620
621  traps_done:
622         trace_buffer_restore(j);
623 }
624
625 /* Typical exception handling routines  */
626
627 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
628
629 /*
630  * Similar to get_user, do some address checking, then dereference
631  * Return true on success, false on bad address
632  */
633 static bool get_instruction(unsigned short *val, unsigned short *address)
634 {
635         unsigned long addr = (unsigned long)address;
636
637         /* Check for odd addresses */
638         if (addr & 0x1)
639                 return false;
640
641         /* MMR region will never have instructions */
642         if (addr >= SYSMMR_BASE)
643                 return false;
644
645         switch (bfin_mem_access_type(addr, 2)) {
646                 case BFIN_MEM_ACCESS_CORE:
647                 case BFIN_MEM_ACCESS_CORE_ONLY:
648                         *val = *address;
649                         return true;
650                 case BFIN_MEM_ACCESS_DMA:
651                         dma_memcpy(val, address, 2);
652                         return true;
653                 case BFIN_MEM_ACCESS_ITEST:
654                         isram_memcpy(val, address, 2);
655                         return true;
656                 default: /* invalid access */
657                         return false;
658         }
659 }
660
661 /*
662  * decode the instruction if we are printing out the trace, as it
663  * makes things easier to follow, without running it through objdump
664  * These are the normal instructions which cause change of flow, which
665  * would be at the source of the trace buffer
666  */
667 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
668 static void decode_instruction(unsigned short *address)
669 {
670         unsigned short opcode;
671
672         if (get_instruction(&opcode, address)) {
673                 if (opcode == 0x0010)
674                         verbose_printk("RTS");
675                 else if (opcode == 0x0011)
676                         verbose_printk("RTI");
677                 else if (opcode == 0x0012)
678                         verbose_printk("RTX");
679                 else if (opcode == 0x0013)
680                         verbose_printk("RTN");
681                 else if (opcode == 0x0014)
682                         verbose_printk("RTE");
683                 else if (opcode == 0x0025)
684                         verbose_printk("EMUEXCPT");
685                 else if (opcode == 0x0040 && opcode <= 0x0047)
686                         verbose_printk("STI R%i", opcode & 7);
687                 else if (opcode >= 0x0050 && opcode <= 0x0057)
688                         verbose_printk("JUMP (P%i)", opcode & 7);
689                 else if (opcode >= 0x0060 && opcode <= 0x0067)
690                         verbose_printk("CALL (P%i)", opcode & 7);
691                 else if (opcode >= 0x0070 && opcode <= 0x0077)
692                         verbose_printk("CALL (PC+P%i)", opcode & 7);
693                 else if (opcode >= 0x0080 && opcode <= 0x0087)
694                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
695                 else if (opcode >= 0x0090 && opcode <= 0x009F)
696                         verbose_printk("RAISE 0x%x", opcode & 0xF);
697                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
698                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
699                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
700                         verbose_printk("IF !CC JUMP");
701                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
702                         verbose_printk("IF CC JUMP");
703                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
704                         verbose_printk("JUMP.S");
705                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
706                         verbose_printk("LSETUP");
707                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
708                         verbose_printk("JUMP.L");
709                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
710                         verbose_printk("CALL pcrel");
711                 else
712                         verbose_printk("0x%04x", opcode);
713         }
714
715 }
716 #endif
717
718 void dump_bfin_trace_buffer(void)
719 {
720 #ifdef CONFIG_DEBUG_VERBOSE
721 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
722         int tflags, i = 0;
723         char buf[150];
724         unsigned short *addr;
725 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
726         int j, index;
727 #endif
728
729         trace_buffer_save(tflags);
730
731         printk(KERN_NOTICE "Hardware Trace:\n");
732
733 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
734         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
735 #endif
736
737         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
738                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
739                         decode_address(buf, (unsigned long)bfin_read_TBUF());
740                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
741                         addr = (unsigned short *)bfin_read_TBUF();
742                         decode_address(buf, (unsigned long)addr);
743                         printk(KERN_NOTICE "     Source : %s ", buf);
744                         decode_instruction(addr);
745                         printk("\n");
746                 }
747         }
748
749 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
750         if (trace_buff_offset)
751                 index = trace_buff_offset / 4;
752         else
753                 index = EXPAND_LEN;
754
755         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
756         while (j) {
757                 decode_address(buf, software_trace_buff[index]);
758                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
759                 index -= 1;
760                 if (index < 0 )
761                         index = EXPAND_LEN;
762                 decode_address(buf, software_trace_buff[index]);
763                 printk(KERN_NOTICE "     Source : %s ", buf);
764                 decode_instruction((unsigned short *)software_trace_buff[index]);
765                 printk("\n");
766                 index -= 1;
767                 if (index < 0)
768                         index = EXPAND_LEN;
769                 j--;
770                 i++;
771         }
772 #endif
773
774         trace_buffer_restore(tflags);
775 #endif
776 #endif
777 }
778 EXPORT_SYMBOL(dump_bfin_trace_buffer);
779
780 #ifdef CONFIG_BUG
781 int is_valid_bugaddr(unsigned long addr)
782 {
783         unsigned short opcode;
784
785         if (!get_instruction(&opcode, (unsigned short *)addr))
786                 return 0;
787
788         return opcode == BFIN_BUG_OPCODE;
789 }
790 #endif
791
792 /*
793  * Checks to see if the address pointed to is either a
794  * 16-bit CALL instruction, or a 32-bit CALL instruction
795  */
796 static bool is_bfin_call(unsigned short *addr)
797 {
798         unsigned short opcode = 0, *ins_addr;
799         ins_addr = (unsigned short *)addr;
800
801         if (!get_instruction(&opcode, ins_addr))
802                 return false;
803
804         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
805             (opcode >= 0x0070 && opcode <= 0x0077))
806                 return true;
807
808         ins_addr--;
809         if (!get_instruction(&opcode, ins_addr))
810                 return false;
811
812         if (opcode >= 0xE300 && opcode <= 0xE3FF)
813                 return true;
814
815         return false;
816
817 }
818
819 void show_stack(struct task_struct *task, unsigned long *stack)
820 {
821 #ifdef CONFIG_PRINTK
822         unsigned int *addr, *endstack, *fp = 0, *frame;
823         unsigned short *ins_addr;
824         char buf[150];
825         unsigned int i, j, ret_addr, frame_no = 0;
826
827         /*
828          * If we have been passed a specific stack, use that one otherwise
829          *    if we have been passed a task structure, use that, otherwise
830          *    use the stack of where the variable "stack" exists
831          */
832
833         if (stack == NULL) {
834                 if (task) {
835                         /* We know this is a kernel stack, so this is the start/end */
836                         stack = (unsigned long *)task->thread.ksp;
837                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
838                 } else {
839                         /* print out the existing stack info */
840                         stack = (unsigned long *)&stack;
841                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
842                 }
843         } else
844                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
845
846         printk(KERN_NOTICE "Stack info:\n");
847         decode_address(buf, (unsigned int)stack);
848         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
849
850         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
851                 printk(KERN_NOTICE "Invalid stack pointer\n");
852                 return;
853         }
854
855         /* First thing is to look for a frame pointer */
856         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
857                 if (*addr & 0x1)
858                         continue;
859                 ins_addr = (unsigned short *)*addr;
860                 ins_addr--;
861                 if (is_bfin_call(ins_addr))
862                         fp = addr - 1;
863
864                 if (fp) {
865                         /* Let's check to see if it is a frame pointer */
866                         while (fp >= (addr - 1) && fp < endstack
867                                && fp && ((unsigned int) fp & 0x3) == 0)
868                                 fp = (unsigned int *)*fp;
869                         if (fp == 0 || fp == endstack) {
870                                 fp = addr - 1;
871                                 break;
872                         }
873                         fp = 0;
874                 }
875         }
876         if (fp) {
877                 frame = fp;
878                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
879         } else
880                 frame = 0;
881
882         /*
883          * Now that we think we know where things are, we
884          * walk the stack again, this time printing things out
885          * incase there is no frame pointer, we still look for
886          * valid return addresses
887          */
888
889         /* First time print out data, next time, print out symbols */
890         for (j = 0; j <= 1; j++) {
891                 if (j)
892                         printk(KERN_NOTICE "Return addresses in stack:\n");
893                 else
894                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
895
896                 fp = frame;
897                 frame_no = 0;
898
899                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
900                      addr < endstack; addr++, i++) {
901
902                         ret_addr = 0;
903                         if (!j && i % 8 == 0)
904                                 printk(KERN_NOTICE "%p:",addr);
905
906                         /* if it is an odd address, or zero, just skip it */
907                         if (*addr & 0x1 || !*addr)
908                                 goto print;
909
910                         ins_addr = (unsigned short *)*addr;
911
912                         /* Go back one instruction, and see if it is a CALL */
913                         ins_addr--;
914                         ret_addr = is_bfin_call(ins_addr);
915  print:
916                         if (!j && stack == (unsigned long *)addr)
917                                 printk("[%08x]", *addr);
918                         else if (ret_addr)
919                                 if (j) {
920                                         decode_address(buf, (unsigned int)*addr);
921                                         if (frame == addr) {
922                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
923                                                 continue;
924                                         }
925                                         printk(KERN_NOTICE "    address : %s\n", buf);
926                                 } else
927                                         printk("<%08x>", *addr);
928                         else if (fp == addr) {
929                                 if (j)
930                                         frame = addr+1;
931                                 else
932                                         printk("(%08x)", *addr);
933
934                                 fp = (unsigned int *)*addr;
935                                 frame_no++;
936
937                         } else if (!j)
938                                 printk(" %08x ", *addr);
939                 }
940                 if (!j)
941                         printk("\n");
942         }
943 #endif
944 }
945 EXPORT_SYMBOL(show_stack);
946
947 void dump_stack(void)
948 {
949         unsigned long stack;
950 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
951         int tflags;
952 #endif
953         trace_buffer_save(tflags);
954         dump_bfin_trace_buffer();
955         show_stack(current, &stack);
956         trace_buffer_restore(tflags);
957 }
958 EXPORT_SYMBOL(dump_stack);
959
960 void dump_bfin_process(struct pt_regs *fp)
961 {
962 #ifdef CONFIG_DEBUG_VERBOSE
963         /* We should be able to look at fp->ipend, but we don't push it on the
964          * stack all the time, so do this until we fix that */
965         unsigned int context = bfin_read_IPEND();
966
967         if (oops_in_progress)
968                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
969
970         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
971                 verbose_printk(KERN_NOTICE "HW Error context\n");
972         else if (context & 0x0020)
973                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
974         else if (context & 0x3FC0)
975                 verbose_printk(KERN_NOTICE "Interrupt context\n");
976         else if (context & 0x4000)
977                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
978         else if (context & 0x8000)
979                 verbose_printk(KERN_NOTICE "Kernel process context\n");
980
981         /* Because we are crashing, and pointers could be bad, we check things
982          * pretty closely before we use them
983          */
984         if ((unsigned long)current >= FIXED_CODE_START &&
985             !((unsigned long)current & 0x3) && current->pid) {
986                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
987                 if (current->comm >= (char *)FIXED_CODE_START)
988                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d",
989                                 current->comm, current->pid);
990                 else
991                         verbose_printk(KERN_NOTICE "COMM= invalid");
992
993                 printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu);
994                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
995                         verbose_printk(KERN_NOTICE
996                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
997                                 " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
998                                 (void *)current->mm->start_code,
999                                 (void *)current->mm->end_code,
1000                                 (void *)current->mm->start_data,
1001                                 (void *)current->mm->end_data,
1002                                 (void *)current->mm->end_data,
1003                                 (void *)current->mm->brk,
1004                                 (void *)current->mm->start_stack);
1005                 else
1006                         verbose_printk(KERN_NOTICE "invalid mm\n");
1007         } else
1008                 verbose_printk(KERN_NOTICE
1009                                "No Valid process in current context\n");
1010 #endif
1011 }
1012
1013 void dump_bfin_mem(struct pt_regs *fp)
1014 {
1015 #ifdef CONFIG_DEBUG_VERBOSE
1016         unsigned short *addr, *erraddr, val = 0, err = 0;
1017         char sti = 0, buf[6];
1018
1019         erraddr = (void *)fp->pc;
1020
1021         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1022
1023         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1024              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1025              addr++) {
1026                 if (!((unsigned long)addr & 0xF))
1027                         verbose_printk(KERN_NOTICE "0x%p: ", addr);
1028
1029                 if (!get_instruction(&val, addr)) {
1030                                 val = 0;
1031                                 sprintf(buf, "????");
1032                 } else
1033                         sprintf(buf, "%04x", val);
1034
1035                 if (addr == erraddr) {
1036                         verbose_printk("[%s]", buf);
1037                         err = val;
1038                 } else
1039                         verbose_printk(" %s ", buf);
1040
1041                 /* Do any previous instructions turn on interrupts? */
1042                 if (addr <= erraddr &&                          /* in the past */
1043                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1044                       val == 0x017b))                           /* [SP++] = RETI */
1045                         sti = 1;
1046         }
1047
1048         verbose_printk("\n");
1049
1050         /* Hardware error interrupts can be deferred */
1051         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1052             oops_in_progress)){
1053                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1054 #ifndef CONFIG_DEBUG_HWERR
1055                 verbose_printk(KERN_NOTICE
1056 "The remaining message may be meaningless\n"
1057 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1058 #else
1059                 /* If we are handling only one peripheral interrupt
1060                  * and current mm and pid are valid, and the last error
1061                  * was in that user space process's text area
1062                  * print it out - because that is where the problem exists
1063                  */
1064                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1065                      (current->pid && current->mm)) {
1066                         /* And the last RETI points to the current userspace context */
1067                         if ((fp + 1)->pc >= current->mm->start_code &&
1068                             (fp + 1)->pc <= current->mm->end_code) {
1069                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1070                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1071                                 show_regs(fp + 1);
1072                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1073                         }
1074                 }
1075 #endif
1076         }
1077 #endif
1078 }
1079
1080 void show_regs(struct pt_regs *fp)
1081 {
1082 #ifdef CONFIG_DEBUG_VERBOSE
1083         char buf [150];
1084         struct irqaction *action;
1085         unsigned int i;
1086         unsigned long flags = 0;
1087         unsigned int cpu = raw_smp_processor_id();
1088         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1089
1090         verbose_printk(KERN_NOTICE "\n");
1091         if (CPUID != bfin_cpuid())
1092                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1093                         "but running on:0x%04x (Rev %d)\n",
1094                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1095
1096         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1097                 CPU, bfin_compiled_revid());
1098
1099         if (bfin_compiled_revid() !=  bfin_revid())
1100                 verbose_printk("(Detected 0.%d)", bfin_revid());
1101
1102         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1103                 get_cclk()/1000000, get_sclk()/1000000,
1104 #ifdef CONFIG_MPU
1105                 "mpu on"
1106 #else
1107                 "mpu off"
1108 #endif
1109                 );
1110
1111         verbose_printk(KERN_NOTICE "%s", linux_banner);
1112
1113         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
1114         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
1115                 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1116         if (fp->ipend & EVT_IRPTEN)
1117                 verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
1118         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1119                         EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1120                 verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
1121         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1122                 verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
1123         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1124                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1125                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1126 #ifdef EBIU_ERRMST
1127                 /* If the error was from the EBIU, print it out */
1128                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1129                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1130                                 bfin_read_EBIU_ERRMST());
1131                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1132                                 bfin_read_EBIU_ERRADD());
1133                 }
1134 #endif
1135         }
1136         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1137                 fp->seqstat & SEQSTAT_EXCAUSE);
1138         for (i = 2; i <= 15 ; i++) {
1139                 if (fp->ipend & (1 << i)) {
1140                         if (i != 4) {
1141                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1142                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1143                         } else
1144                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1145                 }
1146         }
1147
1148         /* if no interrupts are going off, don't print this out */
1149         if (fp->ipend & ~0x3F) {
1150                 for (i = 0; i < (NR_IRQS - 1); i++) {
1151                         if (!in_atomic)
1152                                 spin_lock_irqsave(&irq_desc[i].lock, flags);
1153
1154                         action = irq_desc[i].action;
1155                         if (!action)
1156                                 goto unlock;
1157
1158                         decode_address(buf, (unsigned int)action->handler);
1159                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1160                         for (action = action->next; action; action = action->next) {
1161                                 decode_address(buf, (unsigned int)action->handler);
1162                                 verbose_printk(", %s", buf);
1163                         }
1164                         verbose_printk("\n");
1165 unlock:
1166                         if (!in_atomic)
1167                                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1168                 }
1169         }
1170
1171         decode_address(buf, fp->rete);
1172         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1173         decode_address(buf, fp->retn);
1174         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1175         decode_address(buf, fp->retx);
1176         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1177         decode_address(buf, fp->rets);
1178         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1179         decode_address(buf, fp->pc);
1180         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1181
1182         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1183             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1184                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1185                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1186                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1187                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1188         }
1189
1190         verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1191         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1192                 fp->r0, fp->r1, fp->r2, fp->r3);
1193         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1194                 fp->r4, fp->r5, fp->r6, fp->r7);
1195         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1196                 fp->p0, fp->p1, fp->p2, fp->p3);
1197         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1198                 fp->p4, fp->p5, fp->fp, (long)fp);
1199         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1200                 fp->lb0, fp->lt0, fp->lc0);
1201         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1202                 fp->lb1, fp->lt1, fp->lc1);
1203         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1204                 fp->b0, fp->l0, fp->m0, fp->i0);
1205         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1206                 fp->b1, fp->l1, fp->m1, fp->i1);
1207         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1208                 fp->b2, fp->l2, fp->m2, fp->i2);
1209         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1210                 fp->b3, fp->l3, fp->m3, fp->i3);
1211         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1212                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1213
1214         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1215                 rdusp(), fp->astat);
1216
1217         verbose_printk(KERN_NOTICE "\n");
1218 #endif
1219 }
1220
1221 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1222 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1223 #endif
1224
1225 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1226
1227 asmlinkage int sys_bfin_spinlock(int *p)
1228 {
1229         int ret, tmp = 0;
1230
1231         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1232         ret = get_user(tmp, p);
1233         if (likely(ret == 0)) {
1234                 if (unlikely(tmp))
1235                         ret = 1;
1236                 else
1237                         put_user(1, p);
1238         }
1239         spin_unlock(&bfin_spinlock_lock);
1240         return ret;
1241 }
1242
1243 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1244 {
1245         void (*curr_handler)(void);
1246
1247         if (exception > 0x3F)
1248                 return -EINVAL;
1249
1250         curr_handler = ex_table[exception];
1251
1252         if (curr_handler != ex_replaceable)
1253                 return -EBUSY;
1254
1255         ex_table[exception] = handler;
1256
1257         return 0;
1258 }
1259 EXPORT_SYMBOL(bfin_request_exception);
1260
1261 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1262 {
1263         void (*curr_handler)(void);
1264
1265         if (exception > 0x3F)
1266                 return -EINVAL;
1267
1268         curr_handler = ex_table[exception];
1269
1270         if (curr_handler != handler)
1271                 return -EBUSY;
1272
1273         ex_table[exception] = ex_replaceable;
1274
1275         return 0;
1276 }
1277 EXPORT_SYMBOL(bfin_free_exception);
1278
1279 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1280 {
1281         switch (cplb_panic) {
1282         case CPLB_NO_UNLOCKED:
1283                 printk(KERN_EMERG "All CPLBs are locked\n");
1284                 break;
1285         case CPLB_PROT_VIOL:
1286                 return;
1287         case CPLB_NO_ADDR_MATCH:
1288                 return;
1289         case CPLB_UNKNOWN_ERR:
1290                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1291                 break;
1292         }
1293
1294         oops_in_progress = 1;
1295
1296         dump_bfin_process(fp);
1297         dump_bfin_mem(fp);
1298         show_regs(fp);
1299         dump_stack();
1300         panic("Unrecoverable event");
1301 }