Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[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                 if (!down_read_trylock(&mm->mmap_sem)) {
142                         if (!in_atomic)
143                                 mmput(mm);
144                         continue;
145                 }
146
147                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
148                         struct vm_area_struct *vma;
149
150                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
151
152                         if (address >= vma->vm_start && address < vma->vm_end) {
153                                 char _tmpbuf[256];
154                                 char *name = p->comm;
155                                 struct file *file = vma->vm_file;
156
157                                 if (file) {
158                                         char *d_name = d_path(&file->f_path, _tmpbuf,
159                                                       sizeof(_tmpbuf));
160                                         if (!IS_ERR(d_name))
161                                                 name = d_name;
162                                 }
163
164                                 /* FLAT does not have its text aligned to the start of
165                                  * the map while FDPIC ELF does ...
166                                  */
167
168                                 /* before we can check flat/fdpic, we need to
169                                  * make sure current is valid
170                                  */
171                                 if ((unsigned long)current >= FIXED_CODE_START &&
172                                     !((unsigned long)current & 0x3)) {
173                                         if (current->mm &&
174                                             (address > current->mm->start_code) &&
175                                             (address < current->mm->end_code))
176                                                 offset = address - current->mm->start_code;
177                                         else
178                                                 offset = (address - vma->vm_start) +
179                                                          (vma->vm_pgoff << PAGE_SHIFT);
180
181                                         sprintf(buf, "[ %s + 0x%lx ]", name, offset);
182                                 } else
183                                         sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
184                                                 name, vma->vm_start, vma->vm_end);
185
186                                 up_read(&mm->mmap_sem);
187                                 if (!in_atomic)
188                                         mmput(mm);
189
190                                 if (buf[0] == '\0')
191                                         sprintf(buf, "[ %s ] dynamic memory", name);
192
193                                 goto done;
194                         }
195                 }
196
197                 up_read(&mm->mmap_sem);
198                 if (!in_atomic)
199                         mmput(mm);
200         }
201
202         /*
203          * we were unable to find this address anywhere,
204          * or some MMs were skipped because they were in use.
205          */
206         sprintf(buf, "/* kernel dynamic memory */");
207
208 done:
209         write_unlock_irqrestore(&tasklist_lock, flags);
210 #else
211         sprintf(buf, " ");
212 #endif
213 }
214
215 asmlinkage void double_fault_c(struct pt_regs *fp)
216 {
217 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
218         int j;
219         trace_buffer_save(j);
220 #endif
221
222         console_verbose();
223         oops_in_progress = 1;
224 #ifdef CONFIG_DEBUG_VERBOSE
225         printk(KERN_EMERG "Double Fault\n");
226 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
227         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
228                 unsigned int cpu = raw_smp_processor_id();
229                 char buf[150];
230                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
231                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
232                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
233                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
234                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
235                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
236                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
237
238                 decode_address(buf, fp->retx);
239                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
240         } else
241 #endif
242         {
243                 dump_bfin_process(fp);
244                 dump_bfin_mem(fp);
245                 show_regs(fp);
246                 dump_bfin_trace_buffer();
247         }
248 #endif
249         panic("Double Fault - unrecoverable event");
250
251 }
252
253 static int kernel_mode_regs(struct pt_regs *regs)
254 {
255         return regs->ipend & 0xffc0;
256 }
257
258 asmlinkage notrace void trap_c(struct pt_regs *fp)
259 {
260 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
261         int j;
262 #endif
263         unsigned int cpu = raw_smp_processor_id();
264         const char *strerror = NULL;
265         int sig = 0;
266         siginfo_t info;
267         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
268
269         trace_buffer_save(j);
270 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
271         last_seqstat = (u32)fp->seqstat;
272 #endif
273
274         /* Important - be very careful dereferncing pointers - will lead to
275          * double faults if the stack has become corrupt
276          */
277
278         /* trap_c() will be called for exceptions. During exceptions
279          * processing, the pc value should be set with retx value.
280          * With this change we can cleanup some code in signal.c- TODO
281          */
282         fp->orig_pc = fp->retx;
283         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
284                 trapnr, fp->ipend, fp->pc, fp->retx); */
285
286         /* send the appropriate signal to the user program */
287         switch (trapnr) {
288
289         /* This table works in conjuction with the one in ./mach-common/entry.S
290          * Some exceptions are handled there (in assembly, in exception space)
291          * Some are handled here, (in C, in interrupt space)
292          * Some, like CPLB, are handled in both, where the normal path is
293          * handled in assembly/exception space, and the error path is handled
294          * here
295          */
296
297         /* 0x00 - Linux Syscall, getting here is an error */
298         /* 0x01 - userspace gdb breakpoint, handled here */
299         case VEC_EXCPT01:
300                 info.si_code = TRAP_ILLTRAP;
301                 sig = SIGTRAP;
302                 CHK_DEBUGGER_TRAP_MAYBE();
303                 /* Check if this is a breakpoint in kernel space */
304                 if (kernel_mode_regs(fp))
305                         goto traps_done;
306                 else
307                         break;
308         /* 0x03 - User Defined, userspace stack overflow */
309         case VEC_EXCPT03:
310                 info.si_code = SEGV_STACKFLOW;
311                 sig = SIGSEGV;
312                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
313                 CHK_DEBUGGER_TRAP_MAYBE();
314                 break;
315         /* 0x02 - KGDB initial connection and break signal trap */
316         case VEC_EXCPT02:
317 #ifdef CONFIG_KGDB
318                 info.si_code = TRAP_ILLTRAP;
319                 sig = SIGTRAP;
320                 CHK_DEBUGGER_TRAP();
321                 goto traps_done;
322 #endif
323         /* 0x04 - User Defined */
324         /* 0x05 - User Defined */
325         /* 0x06 - User Defined */
326         /* 0x07 - User Defined */
327         /* 0x08 - User Defined */
328         /* 0x09 - User Defined */
329         /* 0x0A - User Defined */
330         /* 0x0B - User Defined */
331         /* 0x0C - User Defined */
332         /* 0x0D - User Defined */
333         /* 0x0E - User Defined */
334         /* 0x0F - User Defined */
335         /* If we got here, it is most likely that someone was trying to use a
336          * custom exception handler, and it is not actually installed properly
337          */
338         case VEC_EXCPT04 ... VEC_EXCPT15:
339                 info.si_code = ILL_ILLPARAOP;
340                 sig = SIGILL;
341                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
342                 CHK_DEBUGGER_TRAP_MAYBE();
343                 break;
344         /* 0x10 HW Single step, handled here */
345         case VEC_STEP:
346                 info.si_code = TRAP_STEP;
347                 sig = SIGTRAP;
348                 CHK_DEBUGGER_TRAP_MAYBE();
349                 /* Check if this is a single step in kernel space */
350                 if (kernel_mode_regs(fp))
351                         goto traps_done;
352                 else
353                         break;
354         /* 0x11 - Trace Buffer Full, handled here */
355         case VEC_OVFLOW:
356                 info.si_code = TRAP_TRACEFLOW;
357                 sig = SIGTRAP;
358                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
359                 CHK_DEBUGGER_TRAP_MAYBE();
360                 break;
361         /* 0x12 - Reserved, Caught by default */
362         /* 0x13 - Reserved, Caught by default */
363         /* 0x14 - Reserved, Caught by default */
364         /* 0x15 - Reserved, Caught by default */
365         /* 0x16 - Reserved, Caught by default */
366         /* 0x17 - Reserved, Caught by default */
367         /* 0x18 - Reserved, Caught by default */
368         /* 0x19 - Reserved, Caught by default */
369         /* 0x1A - Reserved, Caught by default */
370         /* 0x1B - Reserved, Caught by default */
371         /* 0x1C - Reserved, Caught by default */
372         /* 0x1D - Reserved, Caught by default */
373         /* 0x1E - Reserved, Caught by default */
374         /* 0x1F - Reserved, Caught by default */
375         /* 0x20 - Reserved, Caught by default */
376         /* 0x21 - Undefined Instruction, handled here */
377         case VEC_UNDEF_I:
378 #ifdef CONFIG_BUG
379                 if (kernel_mode_regs(fp)) {
380                         switch (report_bug(fp->pc, fp)) {
381                         case BUG_TRAP_TYPE_NONE:
382                                 break;
383                         case BUG_TRAP_TYPE_WARN:
384                                 dump_bfin_trace_buffer();
385                                 fp->pc += 2;
386                                 goto traps_done;
387                         case BUG_TRAP_TYPE_BUG:
388                                 /* call to panic() will dump trace, and it is
389                                  * off at this point, so it won't be clobbered
390                                  */
391                                 panic("BUG()");
392                         }
393                 }
394 #endif
395                 info.si_code = ILL_ILLOPC;
396                 sig = SIGILL;
397                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
398                 CHK_DEBUGGER_TRAP_MAYBE();
399                 break;
400         /* 0x22 - Illegal Instruction Combination, handled here */
401         case VEC_ILGAL_I:
402                 info.si_code = ILL_ILLPARAOP;
403                 sig = SIGILL;
404                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
405                 CHK_DEBUGGER_TRAP_MAYBE();
406                 break;
407         /* 0x23 - Data CPLB protection violation, handled here */
408         case VEC_CPLB_VL:
409                 info.si_code = ILL_CPLB_VI;
410                 sig = SIGSEGV;
411                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
412                 CHK_DEBUGGER_TRAP_MAYBE();
413                 break;
414         /* 0x24 - Data access misaligned, handled here */
415         case VEC_MISALI_D:
416                 info.si_code = BUS_ADRALN;
417                 sig = SIGBUS;
418                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
419                 CHK_DEBUGGER_TRAP_MAYBE();
420                 break;
421         /* 0x25 - Unrecoverable Event, handled here */
422         case VEC_UNCOV:
423                 info.si_code = ILL_ILLEXCPT;
424                 sig = SIGILL;
425                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
426                 CHK_DEBUGGER_TRAP_MAYBE();
427                 break;
428         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
429                 error case is handled here */
430         case VEC_CPLB_M:
431                 info.si_code = BUS_ADRALN;
432                 sig = SIGBUS;
433                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
434                 break;
435         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
436         case VEC_CPLB_MHIT:
437                 info.si_code = ILL_CPLB_MULHIT;
438                 sig = SIGSEGV;
439 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
440                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
441                         strerror = KERN_NOTICE "NULL pointer access\n";
442                 else
443 #endif
444                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
445                 CHK_DEBUGGER_TRAP_MAYBE();
446                 break;
447         /* 0x28 - Emulation Watchpoint, handled here */
448         case VEC_WATCH:
449                 info.si_code = TRAP_WATCHPT;
450                 sig = SIGTRAP;
451                 pr_debug(EXC_0x28(KERN_DEBUG));
452                 CHK_DEBUGGER_TRAP_MAYBE();
453                 /* Check if this is a watchpoint in kernel space */
454                 if (kernel_mode_regs(fp))
455                         goto traps_done;
456                 else
457                         break;
458 #ifdef CONFIG_BF535
459         /* 0x29 - Instruction fetch access error (535 only) */
460         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
461                 info.si_code = BUS_OPFETCH;
462                 sig = SIGBUS;
463                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
464                 CHK_DEBUGGER_TRAP_MAYBE();
465                 break;
466 #else
467         /* 0x29 - Reserved, Caught by default */
468 #endif
469         /* 0x2A - Instruction fetch misaligned, handled here */
470         case VEC_MISALI_I:
471                 info.si_code = BUS_ADRALN;
472                 sig = SIGBUS;
473                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
474                 CHK_DEBUGGER_TRAP_MAYBE();
475                 break;
476         /* 0x2B - Instruction CPLB protection violation, handled here */
477         case VEC_CPLB_I_VL:
478                 info.si_code = ILL_CPLB_VI;
479                 sig = SIGBUS;
480                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
481                 CHK_DEBUGGER_TRAP_MAYBE();
482                 break;
483         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
484         case VEC_CPLB_I_M:
485                 info.si_code = ILL_CPLB_MISS;
486                 sig = SIGBUS;
487                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
488                 break;
489         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
490         case VEC_CPLB_I_MHIT:
491                 info.si_code = ILL_CPLB_MULHIT;
492                 sig = SIGSEGV;
493 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
494                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
495                         strerror = KERN_NOTICE "Jump to NULL address\n";
496                 else
497 #endif
498                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
499                 CHK_DEBUGGER_TRAP_MAYBE();
500                 break;
501         /* 0x2E - Illegal use of Supervisor Resource, handled here */
502         case VEC_ILL_RES:
503                 info.si_code = ILL_PRVOPC;
504                 sig = SIGILL;
505                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
506                 CHK_DEBUGGER_TRAP_MAYBE();
507                 break;
508         /* 0x2F - Reserved, Caught by default */
509         /* 0x30 - Reserved, Caught by default */
510         /* 0x31 - Reserved, Caught by default */
511         /* 0x32 - Reserved, Caught by default */
512         /* 0x33 - Reserved, Caught by default */
513         /* 0x34 - Reserved, Caught by default */
514         /* 0x35 - Reserved, Caught by default */
515         /* 0x36 - Reserved, Caught by default */
516         /* 0x37 - Reserved, Caught by default */
517         /* 0x38 - Reserved, Caught by default */
518         /* 0x39 - Reserved, Caught by default */
519         /* 0x3A - Reserved, Caught by default */
520         /* 0x3B - Reserved, Caught by default */
521         /* 0x3C - Reserved, Caught by default */
522         /* 0x3D - Reserved, Caught by default */
523         /* 0x3E - Reserved, Caught by default */
524         /* 0x3F - Reserved, Caught by default */
525         case VEC_HWERR:
526                 info.si_code = BUS_ADRALN;
527                 sig = SIGBUS;
528                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
529                 /* System MMR Error */
530                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
531                         info.si_code = BUS_ADRALN;
532                         sig = SIGBUS;
533                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
534                         break;
535                 /* External Memory Addressing Error */
536                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
537                         if (ANOMALY_05000310) {
538                                 static unsigned long anomaly_rets;
539
540                                 if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
541                                     (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
542                                         /*
543                                          * A false hardware error will happen while fetching at
544                                          * the L1 instruction SRAM boundary.  Ignore it.
545                                          */
546                                         anomaly_rets = fp->rets;
547                                         goto traps_done;
548                                 } else if (fp->rets == anomaly_rets) {
549                                         /*
550                                          * While boundary code returns to a function, at the ret
551                                          * point, a new false hardware error might occur too based
552                                          * on tests.  Ignore it too.
553                                          */
554                                         goto traps_done;
555                                 } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
556                                            (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
557                                         /*
558                                          * If boundary code calls a function, at the entry point,
559                                          * a new false hardware error maybe happen based on tests.
560                                          * Ignore it too.
561                                          */
562                                         goto traps_done;
563                                 } else
564                                         anomaly_rets = 0;
565                         }
566
567                         info.si_code = BUS_ADRERR;
568                         sig = SIGBUS;
569                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
570                         break;
571                 /* Performance Monitor Overflow */
572                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
573                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
574                         break;
575                 /* RAISE 5 instruction */
576                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
577                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
578                         break;
579                 default:        /* Reserved */
580                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
581                         break;
582                 }
583                 CHK_DEBUGGER_TRAP_MAYBE();
584                 break;
585         /*
586          * We should be handling all known exception types above,
587          * if we get here we hit a reserved one, so panic
588          */
589         default:
590                 info.si_code = ILL_ILLPARAOP;
591                 sig = SIGILL;
592                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
593                         (fp->seqstat & SEQSTAT_EXCAUSE));
594                 CHK_DEBUGGER_TRAP_MAYBE();
595                 break;
596         }
597
598         BUG_ON(sig == 0);
599
600         /* If the fault was caused by a kernel thread, or interrupt handler
601          * we will kernel panic, so the system reboots.
602          */
603         if (kernel_mode_regs(fp) || (current && !current->mm)) {
604                 console_verbose();
605                 oops_in_progress = 1;
606         }
607
608         if (sig != SIGTRAP) {
609                 if (strerror)
610                         verbose_printk(strerror);
611
612                 dump_bfin_process(fp);
613                 dump_bfin_mem(fp);
614                 show_regs(fp);
615
616                 /* Print out the trace buffer if it makes sense */
617 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
618                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
619                         verbose_printk(KERN_NOTICE "No trace since you do not have "
620                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
621                 else
622 #endif
623                         dump_bfin_trace_buffer();
624
625                 if (oops_in_progress) {
626                         /* Dump the current kernel stack */
627                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
628                         show_stack(current, NULL);
629                         print_modules();
630 #ifndef CONFIG_ACCESS_CHECK
631                         verbose_printk(KERN_EMERG "Please turn on "
632                                "CONFIG_ACCESS_CHECK\n");
633 #endif
634                         panic("Kernel exception");
635                 } else {
636 #ifdef CONFIG_DEBUG_VERBOSE
637                         unsigned long *stack;
638                         /* Dump the user space stack */
639                         stack = (unsigned long *)rdusp();
640                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
641                         show_stack(NULL, stack);
642 #endif
643                 }
644         }
645
646 #ifdef CONFIG_IPIPE
647         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
648 #endif
649         {
650                 info.si_signo = sig;
651                 info.si_errno = 0;
652                 switch (trapnr) {
653                 case VEC_CPLB_VL:
654                 case VEC_MISALI_D:
655                 case VEC_CPLB_M:
656                 case VEC_CPLB_MHIT:
657                         info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
658                         break;
659                 default:
660                         info.si_addr = (void __user *)fp->pc;
661                         break;
662                 }
663                 force_sig_info(sig, &info, current);
664         }
665
666         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
667             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
668             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
669                 fp->pc = SAFE_USER_INSTRUCTION;
670
671  traps_done:
672         trace_buffer_restore(j);
673 }
674
675 /* Typical exception handling routines  */
676
677 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
678
679 /*
680  * Similar to get_user, do some address checking, then dereference
681  * Return true on success, false on bad address
682  */
683 static bool get_instruction(unsigned short *val, unsigned short *address)
684 {
685         unsigned long addr = (unsigned long)address;
686
687         /* Check for odd addresses */
688         if (addr & 0x1)
689                 return false;
690
691         /* MMR region will never have instructions */
692         if (addr >= SYSMMR_BASE)
693                 return false;
694
695         switch (bfin_mem_access_type(addr, 2)) {
696                 case BFIN_MEM_ACCESS_CORE:
697                 case BFIN_MEM_ACCESS_CORE_ONLY:
698                         *val = *address;
699                         return true;
700                 case BFIN_MEM_ACCESS_DMA:
701                         dma_memcpy(val, address, 2);
702                         return true;
703                 case BFIN_MEM_ACCESS_ITEST:
704                         isram_memcpy(val, address, 2);
705                         return true;
706                 default: /* invalid access */
707                         return false;
708         }
709 }
710
711 /*
712  * decode the instruction if we are printing out the trace, as it
713  * makes things easier to follow, without running it through objdump
714  * These are the normal instructions which cause change of flow, which
715  * would be at the source of the trace buffer
716  */
717 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
718 static void decode_instruction(unsigned short *address)
719 {
720         unsigned short opcode;
721
722         if (get_instruction(&opcode, address)) {
723                 if (opcode == 0x0010)
724                         verbose_printk("RTS");
725                 else if (opcode == 0x0011)
726                         verbose_printk("RTI");
727                 else if (opcode == 0x0012)
728                         verbose_printk("RTX");
729                 else if (opcode == 0x0013)
730                         verbose_printk("RTN");
731                 else if (opcode == 0x0014)
732                         verbose_printk("RTE");
733                 else if (opcode == 0x0025)
734                         verbose_printk("EMUEXCPT");
735                 else if (opcode >= 0x0040 && opcode <= 0x0047)
736                         verbose_printk("STI R%i", opcode & 7);
737                 else if (opcode >= 0x0050 && opcode <= 0x0057)
738                         verbose_printk("JUMP (P%i)", opcode & 7);
739                 else if (opcode >= 0x0060 && opcode <= 0x0067)
740                         verbose_printk("CALL (P%i)", opcode & 7);
741                 else if (opcode >= 0x0070 && opcode <= 0x0077)
742                         verbose_printk("CALL (PC+P%i)", opcode & 7);
743                 else if (opcode >= 0x0080 && opcode <= 0x0087)
744                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
745                 else if (opcode >= 0x0090 && opcode <= 0x009F)
746                         verbose_printk("RAISE 0x%x", opcode & 0xF);
747                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
748                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
749                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
750                         verbose_printk("IF !CC JUMP");
751                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
752                         verbose_printk("IF CC JUMP");
753                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
754                         verbose_printk("JUMP.S");
755                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
756                         verbose_printk("LSETUP");
757                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
758                         verbose_printk("JUMP.L");
759                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
760                         verbose_printk("CALL pcrel");
761                 else
762                         verbose_printk("0x%04x", opcode);
763         }
764
765 }
766 #endif
767
768 void dump_bfin_trace_buffer(void)
769 {
770 #ifdef CONFIG_DEBUG_VERBOSE
771 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
772         int tflags, i = 0;
773         char buf[150];
774         unsigned short *addr;
775 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
776         int j, index;
777 #endif
778
779         trace_buffer_save(tflags);
780
781         printk(KERN_NOTICE "Hardware Trace:\n");
782
783 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
784         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
785 #endif
786
787         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
788                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
789                         decode_address(buf, (unsigned long)bfin_read_TBUF());
790                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
791                         addr = (unsigned short *)bfin_read_TBUF();
792                         decode_address(buf, (unsigned long)addr);
793                         printk(KERN_NOTICE "     Source : %s ", buf);
794                         decode_instruction(addr);
795                         printk("\n");
796                 }
797         }
798
799 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
800         if (trace_buff_offset)
801                 index = trace_buff_offset / 4;
802         else
803                 index = EXPAND_LEN;
804
805         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
806         while (j) {
807                 decode_address(buf, software_trace_buff[index]);
808                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
809                 index -= 1;
810                 if (index < 0 )
811                         index = EXPAND_LEN;
812                 decode_address(buf, software_trace_buff[index]);
813                 printk(KERN_NOTICE "     Source : %s ", buf);
814                 decode_instruction((unsigned short *)software_trace_buff[index]);
815                 printk("\n");
816                 index -= 1;
817                 if (index < 0)
818                         index = EXPAND_LEN;
819                 j--;
820                 i++;
821         }
822 #endif
823
824         trace_buffer_restore(tflags);
825 #endif
826 #endif
827 }
828 EXPORT_SYMBOL(dump_bfin_trace_buffer);
829
830 #ifdef CONFIG_BUG
831 int is_valid_bugaddr(unsigned long addr)
832 {
833         unsigned short opcode;
834
835         if (!get_instruction(&opcode, (unsigned short *)addr))
836                 return 0;
837
838         return opcode == BFIN_BUG_OPCODE;
839 }
840 #endif
841
842 /*
843  * Checks to see if the address pointed to is either a
844  * 16-bit CALL instruction, or a 32-bit CALL instruction
845  */
846 static bool is_bfin_call(unsigned short *addr)
847 {
848         unsigned short opcode = 0, *ins_addr;
849         ins_addr = (unsigned short *)addr;
850
851         if (!get_instruction(&opcode, ins_addr))
852                 return false;
853
854         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
855             (opcode >= 0x0070 && opcode <= 0x0077))
856                 return true;
857
858         ins_addr--;
859         if (!get_instruction(&opcode, ins_addr))
860                 return false;
861
862         if (opcode >= 0xE300 && opcode <= 0xE3FF)
863                 return true;
864
865         return false;
866
867 }
868
869 void show_stack(struct task_struct *task, unsigned long *stack)
870 {
871 #ifdef CONFIG_PRINTK
872         unsigned int *addr, *endstack, *fp = 0, *frame;
873         unsigned short *ins_addr;
874         char buf[150];
875         unsigned int i, j, ret_addr, frame_no = 0;
876
877         /*
878          * If we have been passed a specific stack, use that one otherwise
879          *    if we have been passed a task structure, use that, otherwise
880          *    use the stack of where the variable "stack" exists
881          */
882
883         if (stack == NULL) {
884                 if (task) {
885                         /* We know this is a kernel stack, so this is the start/end */
886                         stack = (unsigned long *)task->thread.ksp;
887                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
888                 } else {
889                         /* print out the existing stack info */
890                         stack = (unsigned long *)&stack;
891                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
892                 }
893         } else
894                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
895
896         printk(KERN_NOTICE "Stack info:\n");
897         decode_address(buf, (unsigned int)stack);
898         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
899
900         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
901                 printk(KERN_NOTICE "Invalid stack pointer\n");
902                 return;
903         }
904
905         /* First thing is to look for a frame pointer */
906         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
907                 if (*addr & 0x1)
908                         continue;
909                 ins_addr = (unsigned short *)*addr;
910                 ins_addr--;
911                 if (is_bfin_call(ins_addr))
912                         fp = addr - 1;
913
914                 if (fp) {
915                         /* Let's check to see if it is a frame pointer */
916                         while (fp >= (addr - 1) && fp < endstack
917                                && fp && ((unsigned int) fp & 0x3) == 0)
918                                 fp = (unsigned int *)*fp;
919                         if (fp == 0 || fp == endstack) {
920                                 fp = addr - 1;
921                                 break;
922                         }
923                         fp = 0;
924                 }
925         }
926         if (fp) {
927                 frame = fp;
928                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
929         } else
930                 frame = 0;
931
932         /*
933          * Now that we think we know where things are, we
934          * walk the stack again, this time printing things out
935          * incase there is no frame pointer, we still look for
936          * valid return addresses
937          */
938
939         /* First time print out data, next time, print out symbols */
940         for (j = 0; j <= 1; j++) {
941                 if (j)
942                         printk(KERN_NOTICE "Return addresses in stack:\n");
943                 else
944                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
945
946                 fp = frame;
947                 frame_no = 0;
948
949                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
950                      addr < endstack; addr++, i++) {
951
952                         ret_addr = 0;
953                         if (!j && i % 8 == 0)
954                                 printk(KERN_NOTICE "%p:",addr);
955
956                         /* if it is an odd address, or zero, just skip it */
957                         if (*addr & 0x1 || !*addr)
958                                 goto print;
959
960                         ins_addr = (unsigned short *)*addr;
961
962                         /* Go back one instruction, and see if it is a CALL */
963                         ins_addr--;
964                         ret_addr = is_bfin_call(ins_addr);
965  print:
966                         if (!j && stack == (unsigned long *)addr)
967                                 printk("[%08x]", *addr);
968                         else if (ret_addr)
969                                 if (j) {
970                                         decode_address(buf, (unsigned int)*addr);
971                                         if (frame == addr) {
972                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
973                                                 continue;
974                                         }
975                                         printk(KERN_NOTICE "    address : %s\n", buf);
976                                 } else
977                                         printk("<%08x>", *addr);
978                         else if (fp == addr) {
979                                 if (j)
980                                         frame = addr+1;
981                                 else
982                                         printk("(%08x)", *addr);
983
984                                 fp = (unsigned int *)*addr;
985                                 frame_no++;
986
987                         } else if (!j)
988                                 printk(" %08x ", *addr);
989                 }
990                 if (!j)
991                         printk("\n");
992         }
993 #endif
994 }
995 EXPORT_SYMBOL(show_stack);
996
997 void dump_stack(void)
998 {
999         unsigned long stack;
1000 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
1001         int tflags;
1002 #endif
1003         trace_buffer_save(tflags);
1004         dump_bfin_trace_buffer();
1005         show_stack(current, &stack);
1006         trace_buffer_restore(tflags);
1007 }
1008 EXPORT_SYMBOL(dump_stack);
1009
1010 void dump_bfin_process(struct pt_regs *fp)
1011 {
1012 #ifdef CONFIG_DEBUG_VERBOSE
1013         /* We should be able to look at fp->ipend, but we don't push it on the
1014          * stack all the time, so do this until we fix that */
1015         unsigned int context = bfin_read_IPEND();
1016
1017         if (oops_in_progress)
1018                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
1019
1020         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
1021                 verbose_printk(KERN_NOTICE "HW Error context\n");
1022         else if (context & 0x0020)
1023                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
1024         else if (context & 0x3FC0)
1025                 verbose_printk(KERN_NOTICE "Interrupt context\n");
1026         else if (context & 0x4000)
1027                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
1028         else if (context & 0x8000)
1029                 verbose_printk(KERN_NOTICE "Kernel process context\n");
1030
1031         /* Because we are crashing, and pointers could be bad, we check things
1032          * pretty closely before we use them
1033          */
1034         if ((unsigned long)current >= FIXED_CODE_START &&
1035             !((unsigned long)current & 0x3) && current->pid) {
1036                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
1037                 if (current->comm >= (char *)FIXED_CODE_START)
1038                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d",
1039                                 current->comm, current->pid);
1040                 else
1041                         verbose_printk(KERN_NOTICE "COMM= invalid");
1042
1043                 printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu);
1044                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
1045                         verbose_printk(KERN_NOTICE
1046                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
1047                                 " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
1048                                 (void *)current->mm->start_code,
1049                                 (void *)current->mm->end_code,
1050                                 (void *)current->mm->start_data,
1051                                 (void *)current->mm->end_data,
1052                                 (void *)current->mm->end_data,
1053                                 (void *)current->mm->brk,
1054                                 (void *)current->mm->start_stack);
1055                 else
1056                         verbose_printk(KERN_NOTICE "invalid mm\n");
1057         } else
1058                 verbose_printk(KERN_NOTICE
1059                                "No Valid process in current context\n");
1060 #endif
1061 }
1062
1063 void dump_bfin_mem(struct pt_regs *fp)
1064 {
1065 #ifdef CONFIG_DEBUG_VERBOSE
1066         unsigned short *addr, *erraddr, val = 0, err = 0;
1067         char sti = 0, buf[6];
1068
1069         erraddr = (void *)fp->pc;
1070
1071         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1072
1073         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1074              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1075              addr++) {
1076                 if (!((unsigned long)addr & 0xF))
1077                         verbose_printk(KERN_NOTICE "0x%p: ", addr);
1078
1079                 if (!get_instruction(&val, addr)) {
1080                                 val = 0;
1081                                 sprintf(buf, "????");
1082                 } else
1083                         sprintf(buf, "%04x", val);
1084
1085                 if (addr == erraddr) {
1086                         verbose_printk("[%s]", buf);
1087                         err = val;
1088                 } else
1089                         verbose_printk(" %s ", buf);
1090
1091                 /* Do any previous instructions turn on interrupts? */
1092                 if (addr <= erraddr &&                          /* in the past */
1093                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1094                       val == 0x017b))                           /* [SP++] = RETI */
1095                         sti = 1;
1096         }
1097
1098         verbose_printk("\n");
1099
1100         /* Hardware error interrupts can be deferred */
1101         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1102             oops_in_progress)){
1103                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1104 #ifndef CONFIG_DEBUG_HWERR
1105                 verbose_printk(KERN_NOTICE
1106 "The remaining message may be meaningless\n"
1107 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1108 #else
1109                 /* If we are handling only one peripheral interrupt
1110                  * and current mm and pid are valid, and the last error
1111                  * was in that user space process's text area
1112                  * print it out - because that is where the problem exists
1113                  */
1114                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1115                      (current->pid && current->mm)) {
1116                         /* And the last RETI points to the current userspace context */
1117                         if ((fp + 1)->pc >= current->mm->start_code &&
1118                             (fp + 1)->pc <= current->mm->end_code) {
1119                                 verbose_printk(KERN_NOTICE "It might be better to look around here :\n");
1120                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1121                                 show_regs(fp + 1);
1122                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1123                         }
1124                 }
1125 #endif
1126         }
1127 #endif
1128 }
1129
1130 void show_regs(struct pt_regs *fp)
1131 {
1132 #ifdef CONFIG_DEBUG_VERBOSE
1133         char buf [150];
1134         struct irqaction *action;
1135         unsigned int i;
1136         unsigned long flags = 0;
1137         unsigned int cpu = raw_smp_processor_id();
1138         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1139
1140         verbose_printk(KERN_NOTICE "\n");
1141         if (CPUID != bfin_cpuid())
1142                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1143                         "but running on:0x%04x (Rev %d)\n",
1144                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1145
1146         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1147                 CPU, bfin_compiled_revid());
1148
1149         if (bfin_compiled_revid() !=  bfin_revid())
1150                 verbose_printk("(Detected 0.%d)", bfin_revid());
1151
1152         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1153                 get_cclk()/1000000, get_sclk()/1000000,
1154 #ifdef CONFIG_MPU
1155                 "mpu on"
1156 #else
1157                 "mpu off"
1158 #endif
1159                 );
1160
1161         verbose_printk(KERN_NOTICE "%s", linux_banner);
1162
1163         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
1164         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
1165                 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1166         if (fp->ipend & EVT_IRPTEN)
1167                 verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
1168         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1169                         EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1170                 verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
1171         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1172                 verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
1173         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1174                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1175                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1176 #ifdef EBIU_ERRMST
1177                 /* If the error was from the EBIU, print it out */
1178                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1179                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1180                                 bfin_read_EBIU_ERRMST());
1181                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1182                                 bfin_read_EBIU_ERRADD());
1183                 }
1184 #endif
1185         }
1186         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1187                 fp->seqstat & SEQSTAT_EXCAUSE);
1188         for (i = 2; i <= 15 ; i++) {
1189                 if (fp->ipend & (1 << i)) {
1190                         if (i != 4) {
1191                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1192                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1193                         } else
1194                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1195                 }
1196         }
1197
1198         /* if no interrupts are going off, don't print this out */
1199         if (fp->ipend & ~0x3F) {
1200                 for (i = 0; i < (NR_IRQS - 1); i++) {
1201                         if (!in_atomic)
1202                                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
1203
1204                         action = irq_desc[i].action;
1205                         if (!action)
1206                                 goto unlock;
1207
1208                         decode_address(buf, (unsigned int)action->handler);
1209                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1210                         for (action = action->next; action; action = action->next) {
1211                                 decode_address(buf, (unsigned int)action->handler);
1212                                 verbose_printk(", %s", buf);
1213                         }
1214                         verbose_printk("\n");
1215 unlock:
1216                         if (!in_atomic)
1217                                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1218                 }
1219         }
1220
1221         decode_address(buf, fp->rete);
1222         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1223         decode_address(buf, fp->retn);
1224         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1225         decode_address(buf, fp->retx);
1226         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1227         decode_address(buf, fp->rets);
1228         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1229         decode_address(buf, fp->pc);
1230         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1231
1232         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1233             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1234                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1235                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1236                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1237                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1238         }
1239
1240         verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1241         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1242                 fp->r0, fp->r1, fp->r2, fp->r3);
1243         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1244                 fp->r4, fp->r5, fp->r6, fp->r7);
1245         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1246                 fp->p0, fp->p1, fp->p2, fp->p3);
1247         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1248                 fp->p4, fp->p5, fp->fp, (long)fp);
1249         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1250                 fp->lb0, fp->lt0, fp->lc0);
1251         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1252                 fp->lb1, fp->lt1, fp->lc1);
1253         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1254                 fp->b0, fp->l0, fp->m0, fp->i0);
1255         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1256                 fp->b1, fp->l1, fp->m1, fp->i1);
1257         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1258                 fp->b2, fp->l2, fp->m2, fp->i2);
1259         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1260                 fp->b3, fp->l3, fp->m3, fp->i3);
1261         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1262                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1263
1264         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1265                 rdusp(), fp->astat);
1266
1267         verbose_printk(KERN_NOTICE "\n");
1268 #endif
1269 }
1270
1271 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1272 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1273 #endif
1274
1275 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1276
1277 asmlinkage int sys_bfin_spinlock(int *p)
1278 {
1279         int ret, tmp = 0;
1280
1281         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1282         ret = get_user(tmp, p);
1283         if (likely(ret == 0)) {
1284                 if (unlikely(tmp))
1285                         ret = 1;
1286                 else
1287                         put_user(1, p);
1288         }
1289         spin_unlock(&bfin_spinlock_lock);
1290         return ret;
1291 }
1292
1293 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1294 {
1295         void (*curr_handler)(void);
1296
1297         if (exception > 0x3F)
1298                 return -EINVAL;
1299
1300         curr_handler = ex_table[exception];
1301
1302         if (curr_handler != ex_replaceable)
1303                 return -EBUSY;
1304
1305         ex_table[exception] = handler;
1306
1307         return 0;
1308 }
1309 EXPORT_SYMBOL(bfin_request_exception);
1310
1311 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1312 {
1313         void (*curr_handler)(void);
1314
1315         if (exception > 0x3F)
1316                 return -EINVAL;
1317
1318         curr_handler = ex_table[exception];
1319
1320         if (curr_handler != handler)
1321                 return -EBUSY;
1322
1323         ex_table[exception] = ex_replaceable;
1324
1325         return 0;
1326 }
1327 EXPORT_SYMBOL(bfin_free_exception);
1328
1329 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1330 {
1331         switch (cplb_panic) {
1332         case CPLB_NO_UNLOCKED:
1333                 printk(KERN_EMERG "All CPLBs are locked\n");
1334                 break;
1335         case CPLB_PROT_VIOL:
1336                 return;
1337         case CPLB_NO_ADDR_MATCH:
1338                 return;
1339         case CPLB_UNKNOWN_ERR:
1340                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1341                 break;
1342         }
1343
1344         oops_in_progress = 1;
1345
1346         dump_bfin_process(fp);
1347         dump_bfin_mem(fp);
1348         show_regs(fp);
1349         dump_stack();
1350         panic("Unrecoverable event");
1351 }