Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arjan/linux...
[linux-2.6] / arch / blackfin / kernel / traps.c
1 /*
2  * File:         arch/blackfin/kernel/traps.c
3  * Based on:
4  * Author:       Hamish Macdonald
5  *
6  * Created:
7  * Description:  uses S/W interrupt 15 for the system calls
8  *
9  * Modified:
10  *               Copyright 2004-2006 Analog Devices Inc.
11  *
12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, see the file COPYING, or write
26  * to the Free Software Foundation, Inc.,
27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
28  */
29
30 #include <linux/uaccess.h>
31 #include <linux/interrupt.h>
32 #include <linux/module.h>
33 #include <linux/kallsyms.h>
34 #include <linux/fs.h>
35 #include <asm/traps.h>
36 #include <asm/cacheflush.h>
37 #include <asm/cplb.h>
38 #include <asm/blackfin.h>
39 #include <asm/irq_handler.h>
40 #include <linux/irq.h>
41 #include <asm/trace.h>
42 #include <asm/fixed_code.h>
43
44 #ifdef CONFIG_KGDB
45 # include <linux/kgdb.h>
46
47 # define CHK_DEBUGGER_TRAP() \
48         do { \
49                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
50         } while (0)
51 # define CHK_DEBUGGER_TRAP_MAYBE() \
52         do { \
53                 if (kgdb_connected) \
54                         CHK_DEBUGGER_TRAP(); \
55         } while (0)
56 #else
57 # define CHK_DEBUGGER_TRAP() do { } while (0)
58 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
59 #endif
60
61
62 #ifdef CONFIG_VERBOSE_DEBUG
63 #define verbose_printk(fmt, arg...) \
64         printk(fmt, ##arg)
65 #else
66 #define verbose_printk(fmt, arg...) \
67         ({ if (0) printk(fmt, ##arg); 0; })
68 #endif
69
70 /* Initiate the event table handler */
71 void __init trap_init(void)
72 {
73         CSYNC();
74         bfin_write_EVT3(trap);
75         CSYNC();
76 }
77
78 /*
79  * Used to save the RETX, SEQSTAT, I/D CPLB FAULT ADDR
80  * values across the transition from exception to IRQ5.
81  * We put these in L1, so they are going to be in a valid
82  * location during exception context
83  */
84 __attribute__((l1_data))
85 unsigned long saved_retx, saved_seqstat,
86         saved_icplb_fault_addr, saved_dcplb_fault_addr;
87
88 static void decode_address(char *buf, unsigned long address)
89 {
90 #ifdef CONFIG_DEBUG_VERBOSE
91         struct vm_list_struct *vml;
92         struct task_struct *p;
93         struct mm_struct *mm;
94         unsigned long flags, offset;
95         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
96
97 #ifdef CONFIG_KALLSYMS
98         unsigned long symsize;
99         const char *symname;
100         char *modname;
101         char *delim = ":";
102         char namebuf[128];
103
104         /* look up the address and see if we are in kernel space */
105         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
106
107         if (symname) {
108                 /* yeah! kernel space! */
109                 if (!modname)
110                         modname = delim = "";
111                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
112                               (void *)address, delim, modname, delim, symname,
113                               (unsigned long)offset);
114                 return;
115
116         }
117 #endif
118
119         /* Problem in fixed code section? */
120         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
121                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
122                 return;
123         }
124
125         /* Problem somewhere before the kernel start address */
126         if (address < CONFIG_BOOT_LOAD) {
127                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
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                 vml = mm->context.vmlist;
142                 while (vml) {
143                         struct vm_area_struct *vma = vml->vma;
144
145                         if (address >= vma->vm_start && address < vma->vm_end) {
146                                 char _tmpbuf[256];
147                                 char *name = p->comm;
148                                 struct file *file = vma->vm_file;
149
150                                 if (file)
151                                         name = d_path(&file->f_path, _tmpbuf,
152                                                       sizeof(_tmpbuf));
153
154                                 /* FLAT does not have its text aligned to the start of
155                                  * the map while FDPIC ELF does ...
156                                  */
157
158                                 /* before we can check flat/fdpic, we need to
159                                  * make sure current is valid
160                                  */
161                                 if ((unsigned long)current >= FIXED_CODE_START &&
162                                     !((unsigned long)current & 0x3)) {
163                                         if (current->mm &&
164                                             (address > current->mm->start_code) &&
165                                             (address < current->mm->end_code))
166                                                 offset = address - current->mm->start_code;
167                                         else
168                                                 offset = (address - vma->vm_start) +
169                                                          (vma->vm_pgoff << PAGE_SHIFT);
170
171                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
172                                                 (void *)address, name, offset);
173                                 } else
174                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
175                                                 (void *)address, name,
176                                                 vma->vm_start, vma->vm_end);
177
178                                 if (!in_atomic)
179                                         mmput(mm);
180
181                                 if (!strlen(buf))
182                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
183
184                                 goto done;
185                         }
186
187                         vml = vml->next;
188                 }
189                 if (!in_atomic)
190                         mmput(mm);
191         }
192
193         /* we were unable to find this address anywhere */
194         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
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         console_verbose();
206         oops_in_progress = 1;
207 #ifdef CONFIG_DEBUG_VERBOSE
208         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
209 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
210         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
211                 char buf[150];
212                 decode_address(buf, saved_retx);
213                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
214                         (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
215                 decode_address(buf, saved_dcplb_fault_addr);
216                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
217                 decode_address(buf, saved_icplb_fault_addr);
218                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
219
220                 decode_address(buf, fp->retx);
221                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
222                         buf);
223         } else
224 #endif
225         {
226                 dump_bfin_process(fp);
227                 dump_bfin_mem(fp);
228                 show_regs(fp);
229         }
230 #endif
231         panic("Double Fault - unrecoverable event\n");
232
233 }
234
235 asmlinkage void trap_c(struct pt_regs *fp)
236 {
237 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
238         int j;
239 #endif
240         int sig = 0;
241         siginfo_t info;
242         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
243
244         trace_buffer_save(j);
245
246         /* Important - be very careful dereferncing pointers - will lead to
247          * double faults if the stack has become corrupt
248          */
249
250         /* If the fault was caused by a kernel thread, or interrupt handler
251          * we will kernel panic, so the system reboots.
252          * If KGDB is enabled, don't set this for kernel breakpoints
253         */
254
255         /* TODO: check to see if we are in some sort of deferred HWERR
256          * that we should be able to recover from, not kernel panic
257          */
258         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
259 #ifdef CONFIG_KGDB
260                 && (trapnr != VEC_EXCPT02)
261 #endif
262         ){
263                 console_verbose();
264                 oops_in_progress = 1;
265         } else if (current) {
266                 if (current->mm == NULL) {
267                         console_verbose();
268                         oops_in_progress = 1;
269                 }
270         }
271
272         /* trap_c() will be called for exceptions. During exceptions
273          * processing, the pc value should be set with retx value.
274          * With this change we can cleanup some code in signal.c- TODO
275          */
276         fp->orig_pc = fp->retx;
277         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
278                 trapnr, fp->ipend, fp->pc, fp->retx); */
279
280         /* send the appropriate signal to the user program */
281         switch (trapnr) {
282
283         /* This table works in conjuction with the one in ./mach-common/entry.S
284          * Some exceptions are handled there (in assembly, in exception space)
285          * Some are handled here, (in C, in interrupt space)
286          * Some, like CPLB, are handled in both, where the normal path is
287          * handled in assembly/exception space, and the error path is handled
288          * here
289          */
290
291         /* 0x00 - Linux Syscall, getting here is an error */
292         /* 0x01 - userspace gdb breakpoint, handled here */
293         case VEC_EXCPT01:
294                 info.si_code = TRAP_ILLTRAP;
295                 sig = SIGTRAP;
296                 CHK_DEBUGGER_TRAP_MAYBE();
297                 /* Check if this is a breakpoint in kernel space */
298                 if (fp->ipend & 0xffc0)
299                         return;
300                 else
301                         break;
302         /* 0x03 - User Defined, userspace stack overflow */
303         case VEC_EXCPT03:
304                 info.si_code = SEGV_STACKFLOW;
305                 sig = SIGSEGV;
306                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
307                 CHK_DEBUGGER_TRAP_MAYBE();
308                 break;
309         /* 0x02 - KGDB initial connection and break signal trap */
310         case VEC_EXCPT02:
311 #ifdef CONFIG_KGDB
312                 info.si_code = TRAP_ILLTRAP;
313                 sig = SIGTRAP;
314                 CHK_DEBUGGER_TRAP();
315                 return;
316 #endif
317         /* 0x04 - User Defined */
318         /* 0x05 - User Defined */
319         /* 0x06 - User Defined */
320         /* 0x07 - User Defined */
321         /* 0x08 - User Defined */
322         /* 0x09 - User Defined */
323         /* 0x0A - User Defined */
324         /* 0x0B - User Defined */
325         /* 0x0C - User Defined */
326         /* 0x0D - User Defined */
327         /* 0x0E - User Defined */
328         /* 0x0F - User Defined */
329         /* If we got here, it is most likely that someone was trying to use a
330          * custom exception handler, and it is not actually installed properly
331          */
332         case VEC_EXCPT04 ... VEC_EXCPT15:
333                 info.si_code = ILL_ILLPARAOP;
334                 sig = SIGILL;
335                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
336                 CHK_DEBUGGER_TRAP_MAYBE();
337                 break;
338         /* 0x10 HW Single step, handled here */
339         case VEC_STEP:
340                 info.si_code = TRAP_STEP;
341                 sig = SIGTRAP;
342                 CHK_DEBUGGER_TRAP_MAYBE();
343                 /* Check if this is a single step in kernel space */
344                 if (fp->ipend & 0xffc0)
345                         return;
346                 else
347                         break;
348         /* 0x11 - Trace Buffer Full, handled here */
349         case VEC_OVFLOW:
350                 info.si_code = TRAP_TRACEFLOW;
351                 sig = SIGTRAP;
352                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
353                 CHK_DEBUGGER_TRAP_MAYBE();
354                 break;
355         /* 0x12 - Reserved, Caught by default */
356         /* 0x13 - Reserved, Caught by default */
357         /* 0x14 - Reserved, Caught by default */
358         /* 0x15 - Reserved, Caught by default */
359         /* 0x16 - Reserved, Caught by default */
360         /* 0x17 - Reserved, Caught by default */
361         /* 0x18 - Reserved, Caught by default */
362         /* 0x19 - Reserved, Caught by default */
363         /* 0x1A - Reserved, Caught by default */
364         /* 0x1B - Reserved, Caught by default */
365         /* 0x1C - Reserved, Caught by default */
366         /* 0x1D - Reserved, Caught by default */
367         /* 0x1E - Reserved, Caught by default */
368         /* 0x1F - Reserved, Caught by default */
369         /* 0x20 - Reserved, Caught by default */
370         /* 0x21 - Undefined Instruction, handled here */
371         case VEC_UNDEF_I:
372                 info.si_code = ILL_ILLOPC;
373                 sig = SIGILL;
374                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
375                 CHK_DEBUGGER_TRAP_MAYBE();
376                 break;
377         /* 0x22 - Illegal Instruction Combination, handled here */
378         case VEC_ILGAL_I:
379                 info.si_code = ILL_ILLPARAOP;
380                 sig = SIGILL;
381                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
382                 CHK_DEBUGGER_TRAP_MAYBE();
383                 break;
384         /* 0x23 - Data CPLB protection violation, handled here */
385         case VEC_CPLB_VL:
386                 info.si_code = ILL_CPLB_VI;
387                 sig = SIGBUS;
388                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
389                 CHK_DEBUGGER_TRAP_MAYBE();
390                 break;
391         /* 0x24 - Data access misaligned, handled here */
392         case VEC_MISALI_D:
393                 info.si_code = BUS_ADRALN;
394                 sig = SIGBUS;
395                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
396                 CHK_DEBUGGER_TRAP_MAYBE();
397                 break;
398         /* 0x25 - Unrecoverable Event, handled here */
399         case VEC_UNCOV:
400                 info.si_code = ILL_ILLEXCPT;
401                 sig = SIGILL;
402                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
403                 CHK_DEBUGGER_TRAP_MAYBE();
404                 break;
405         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
406                 error case is handled here */
407         case VEC_CPLB_M:
408                 info.si_code = BUS_ADRALN;
409                 sig = SIGBUS;
410                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
411                 break;
412         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
413         case VEC_CPLB_MHIT:
414                 info.si_code = ILL_CPLB_MULHIT;
415                 sig = SIGSEGV;
416 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
417                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
418                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
419                 else
420 #endif
421                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
422                 CHK_DEBUGGER_TRAP_MAYBE();
423                 break;
424         /* 0x28 - Emulation Watchpoint, handled here */
425         case VEC_WATCH:
426                 info.si_code = TRAP_WATCHPT;
427                 sig = SIGTRAP;
428                 pr_debug(EXC_0x28(KERN_DEBUG));
429                 CHK_DEBUGGER_TRAP_MAYBE();
430                 /* Check if this is a watchpoint in kernel space */
431                 if (fp->ipend & 0xffc0)
432                         return;
433                 else
434                         break;
435 #ifdef CONFIG_BF535
436         /* 0x29 - Instruction fetch access error (535 only) */
437         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
438                 info.si_code = BUS_OPFETCH;
439                 sig = SIGBUS;
440                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
441                 CHK_DEBUGGER_TRAP_MAYBE();
442                 break;
443 #else
444         /* 0x29 - Reserved, Caught by default */
445 #endif
446         /* 0x2A - Instruction fetch misaligned, handled here */
447         case VEC_MISALI_I:
448                 info.si_code = BUS_ADRALN;
449                 sig = SIGBUS;
450                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
451                 CHK_DEBUGGER_TRAP_MAYBE();
452                 break;
453         /* 0x2B - Instruction CPLB protection violation, handled here */
454         case VEC_CPLB_I_VL:
455                 info.si_code = ILL_CPLB_VI;
456                 sig = SIGBUS;
457                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
458                 CHK_DEBUGGER_TRAP_MAYBE();
459                 break;
460         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
461         case VEC_CPLB_I_M:
462                 info.si_code = ILL_CPLB_MISS;
463                 sig = SIGBUS;
464                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
465                 break;
466         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
467         case VEC_CPLB_I_MHIT:
468                 info.si_code = ILL_CPLB_MULHIT;
469                 sig = SIGSEGV;
470 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
471                 if (saved_icplb_fault_addr < FIXED_CODE_START)
472                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
473                 else
474 #endif
475                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
476                 CHK_DEBUGGER_TRAP_MAYBE();
477                 break;
478         /* 0x2E - Illegal use of Supervisor Resource, handled here */
479         case VEC_ILL_RES:
480                 info.si_code = ILL_PRVOPC;
481                 sig = SIGILL;
482                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
483                 CHK_DEBUGGER_TRAP_MAYBE();
484                 break;
485         /* 0x2F - Reserved, Caught by default */
486         /* 0x30 - Reserved, Caught by default */
487         /* 0x31 - Reserved, Caught by default */
488         /* 0x32 - Reserved, Caught by default */
489         /* 0x33 - Reserved, Caught by default */
490         /* 0x34 - Reserved, Caught by default */
491         /* 0x35 - Reserved, Caught by default */
492         /* 0x36 - Reserved, Caught by default */
493         /* 0x37 - Reserved, Caught by default */
494         /* 0x38 - Reserved, Caught by default */
495         /* 0x39 - Reserved, Caught by default */
496         /* 0x3A - Reserved, Caught by default */
497         /* 0x3B - Reserved, Caught by default */
498         /* 0x3C - Reserved, Caught by default */
499         /* 0x3D - Reserved, Caught by default */
500         /* 0x3E - Reserved, Caught by default */
501         /* 0x3F - Reserved, Caught by default */
502         case VEC_HWERR:
503                 info.si_code = BUS_ADRALN;
504                 sig = SIGBUS;
505                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
506                 /* System MMR Error */
507                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
508                         info.si_code = BUS_ADRALN;
509                         sig = SIGBUS;
510                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
511                         break;
512                 /* External Memory Addressing Error */
513                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
514                         info.si_code = BUS_ADRERR;
515                         sig = SIGBUS;
516                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
517                         break;
518                 /* Performance Monitor Overflow */
519                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
520                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
521                         break;
522                 /* RAISE 5 instruction */
523                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
524                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
525                         break;
526                 default:        /* Reserved */
527                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
528                         break;
529                 }
530                 CHK_DEBUGGER_TRAP_MAYBE();
531                 break;
532         /*
533          * We should be handling all known exception types above,
534          * if we get here we hit a reserved one, so panic
535          */
536         default:
537                 oops_in_progress = 1;
538                 info.si_code = ILL_ILLPARAOP;
539                 sig = SIGILL;
540                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
541                         (fp->seqstat & SEQSTAT_EXCAUSE));
542                 CHK_DEBUGGER_TRAP_MAYBE();
543                 break;
544         }
545
546         BUG_ON(sig == 0);
547
548         if (sig != SIGTRAP) {
549                 dump_bfin_process(fp);
550                 dump_bfin_mem(fp);
551                 show_regs(fp);
552
553                 /* Print out the trace buffer if it makes sense */
554 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
555                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
556                         verbose_printk(KERN_NOTICE "No trace since you do not have "
557                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
558                                 KERN_NOTICE "\n");
559                 else
560 #endif
561                         dump_bfin_trace_buffer();
562
563                 if (oops_in_progress) {
564                         /* Dump the current kernel stack */
565                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
566                         show_stack(current, NULL);
567                         print_modules();
568 #ifndef CONFIG_ACCESS_CHECK
569                         verbose_printk(KERN_EMERG "Please turn on "
570                                "CONFIG_ACCESS_CHECK\n");
571 #endif
572                         panic("Kernel exception");
573                 } else {
574 #ifdef CONFIG_VERBOSE_DEBUG
575                         unsigned long *stack;
576                         /* Dump the user space stack */
577                         stack = (unsigned long *)rdusp();
578                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
579                         show_stack(NULL, stack);
580 #endif
581                 }
582         }
583
584         info.si_signo = sig;
585         info.si_errno = 0;
586         info.si_addr = (void __user *)fp->pc;
587         force_sig_info(sig, &info, current);
588
589         trace_buffer_restore(j);
590         return;
591 }
592
593 /* Typical exception handling routines  */
594
595 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
596
597 /*
598  * Similar to get_user, do some address checking, then dereference
599  * Return true on sucess, false on bad address
600  */
601 static bool get_instruction(unsigned short *val, unsigned short *address)
602 {
603
604         unsigned long addr;
605
606         addr = (unsigned long)address;
607
608         /* Check for odd addresses */
609         if (addr & 0x1)
610                 return false;
611
612         /* Check that things do not wrap around */
613         if (addr > (addr + 2))
614                 return false;
615
616         /*
617          * Since we are in exception context, we need to do a little address checking
618          * We need to make sure we are only accessing valid memory, and
619          * we don't read something in the async space that can hang forever
620          */
621         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
622 #if L2_LENGTH != 0
623             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
624 #endif
625             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
626 #if L1_DATA_A_LENGTH != 0
627             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
628 #endif
629 #if L1_DATA_B_LENGTH != 0
630             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
631 #endif
632             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
633             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
634                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
635             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
636                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
637             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
638                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
639             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
640               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
641                 *val = *address;
642                 return true;
643         }
644
645 #if L1_CODE_LENGTH != 0
646         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
647                 isram_memcpy(val, address, 2);
648                 return true;
649         }
650 #endif
651
652
653         return false;
654 }
655
656 /* 
657  * decode the instruction if we are printing out the trace, as it
658  * makes things easier to follow, without running it through objdump
659  * These are the normal instructions which cause change of flow, which
660  * would be at the source of the trace buffer
661  */
662 #ifdef CONFIG_DEBUG_VERBOSE
663 static void decode_instruction(unsigned short *address)
664 {
665         unsigned short opcode;
666
667         if (get_instruction(&opcode, address)) {
668                 if (opcode == 0x0010)
669                         verbose_printk("RTS");
670                 else if (opcode == 0x0011)
671                         verbose_printk("RTI");
672                 else if (opcode == 0x0012)
673                         verbose_printk("RTX");
674                 else if (opcode >= 0x0050 && opcode <= 0x0057)
675                         verbose_printk("JUMP (P%i)", opcode & 7);
676                 else if (opcode >= 0x0060 && opcode <= 0x0067)
677                         verbose_printk("CALL (P%i)", opcode & 7);
678                 else if (opcode >= 0x0070 && opcode <= 0x0077)
679                         verbose_printk("CALL (PC+P%i)", opcode & 7);
680                 else if (opcode >= 0x0080 && opcode <= 0x0087)
681                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
682                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
683                         verbose_printk("IF !CC JUMP");
684                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
685                         verbose_printk("IF CC JUMP");
686                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
687                         verbose_printk("JUMP.S");
688                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
689                         verbose_printk("LSETUP");
690                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
691                         verbose_printk("JUMP.L");
692                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
693                         verbose_printk("CALL pcrel");
694                 else
695                         verbose_printk("0x%04x", opcode);
696         }
697
698 }
699 #endif
700
701 void dump_bfin_trace_buffer(void)
702 {
703 #ifdef CONFIG_DEBUG_VERBOSE
704 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
705         int tflags, i = 0;
706         char buf[150];
707         unsigned short *addr;
708 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
709         int j, index;
710 #endif
711
712         trace_buffer_save(tflags);
713
714         printk(KERN_NOTICE "Hardware Trace:\n");
715
716 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
717         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
718 #endif
719
720         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
721                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
722                         decode_address(buf, (unsigned long)bfin_read_TBUF());
723                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
724                         addr = (unsigned short *)bfin_read_TBUF();
725                         decode_address(buf, (unsigned long)addr);
726                         printk(KERN_NOTICE "     Source : %s ", buf);
727                         decode_instruction(addr);
728                         printk("\n");
729                 }
730         }
731
732 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
733         if (trace_buff_offset)
734                 index = trace_buff_offset / 4;
735         else
736                 index = EXPAND_LEN;
737
738         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
739         while (j) {
740                 decode_address(buf, software_trace_buff[index]);
741                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
742                 index -= 1;
743                 if (index < 0 )
744                         index = EXPAND_LEN;
745                 decode_address(buf, software_trace_buff[index]);
746                 printk(KERN_NOTICE "     Source : %s ", buf);
747                 decode_instruction((unsigned short *)software_trace_buff[index]);
748                 printk("\n");
749                 index -= 1;
750                 if (index < 0)
751                         index = EXPAND_LEN;
752                 j--;
753                 i++;
754         }
755 #endif
756
757         trace_buffer_restore(tflags);
758 #endif
759 #endif
760 }
761 EXPORT_SYMBOL(dump_bfin_trace_buffer);
762
763 /*
764  * Checks to see if the address pointed to is either a
765  * 16-bit CALL instruction, or a 32-bit CALL instruction
766  */
767 static bool is_bfin_call(unsigned short *addr)
768 {
769         unsigned short opcode = 0, *ins_addr;
770         ins_addr = (unsigned short *)addr;
771
772         if (!get_instruction(&opcode, ins_addr))
773                 return false;
774
775         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
776             (opcode >= 0x0070 && opcode <= 0x0077))
777                 return true;
778
779         ins_addr--;
780         if (!get_instruction(&opcode, ins_addr))
781                 return false;
782
783         if (opcode >= 0xE300 && opcode <= 0xE3FF)
784                 return true;
785
786         return false;
787
788 }
789
790 void show_stack(struct task_struct *task, unsigned long *stack)
791 {
792 #ifdef CONFIG_PRINTK
793         unsigned int *addr, *endstack, *fp = 0, *frame;
794         unsigned short *ins_addr;
795         char buf[150];
796         unsigned int i, j, ret_addr, frame_no = 0;
797
798         /*
799          * If we have been passed a specific stack, use that one otherwise
800          *    if we have been passed a task structure, use that, otherwise
801          *    use the stack of where the variable "stack" exists
802          */
803
804         if (stack == NULL) {
805                 if (task) {
806                         /* We know this is a kernel stack, so this is the start/end */
807                         stack = (unsigned long *)task->thread.ksp;
808                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
809                 } else {
810                         /* print out the existing stack info */
811                         stack = (unsigned long *)&stack;
812                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
813                 }
814         } else
815                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
816
817         printk(KERN_NOTICE "Stack info:\n");
818         decode_address(buf, (unsigned int)stack);
819         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
820
821         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
822
823         /* First thing is to look for a frame pointer */
824         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
825                 addr < endstack; addr++, i++) {
826                 if (*addr & 0x1)
827                         continue;
828                 ins_addr = (unsigned short *)*addr;
829                 ins_addr--;
830                 if (is_bfin_call(ins_addr))
831                         fp = addr - 1;
832
833                 if (fp) {
834                         /* Let's check to see if it is a frame pointer */
835                         while (fp >= (addr - 1) && fp < endstack && fp)
836                                 fp = (unsigned int *)*fp;
837                         if (fp == 0 || fp == endstack) {
838                                 fp = addr - 1;
839                                 break;
840                         }
841                         fp = 0;
842                 }
843         }
844         if (fp) {
845                 frame = fp;
846                 printk(" FP: (0x%p)\n", fp);
847         } else
848                 frame = 0;
849
850         /*
851          * Now that we think we know where things are, we
852          * walk the stack again, this time printing things out
853          * incase there is no frame pointer, we still look for
854          * valid return addresses
855          */
856
857         /* First time print out data, next time, print out symbols */
858         for (j = 0; j <= 1; j++) {
859                 if (j)
860                         printk(KERN_NOTICE "Return addresses in stack:\n");
861                 else
862                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
863
864                 fp = frame;
865                 frame_no = 0;
866
867                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
868                      addr <= endstack; addr++, i++) {
869
870                         ret_addr = 0;
871                         if (!j && i % 8 == 0)
872                                 printk("\n" KERN_NOTICE "%p:",addr);
873
874                         /* if it is an odd address, or zero, just skip it */
875                         if (*addr & 0x1 || !*addr)
876                                 goto print;
877
878                         ins_addr = (unsigned short *)*addr;
879
880                         /* Go back one instruction, and see if it is a CALL */
881                         ins_addr--;
882                         ret_addr = is_bfin_call(ins_addr);
883  print:
884                         if (!j && stack == (unsigned long *)addr)
885                                 printk("[%08x]", *addr);
886                         else if (ret_addr)
887                                 if (j) {
888                                         decode_address(buf, (unsigned int)*addr);
889                                         if (frame == addr) {
890                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
891                                                 continue;
892                                         }
893                                         printk(KERN_NOTICE "    address : %s\n", buf);
894                                 } else
895                                         printk("<%08x>", *addr);
896                         else if (fp == addr) {
897                                 if (j)
898                                         frame = addr+1;
899                                 else
900                                         printk("(%08x)", *addr);
901
902                                 fp = (unsigned int *)*addr;
903                                 frame_no++;
904
905                         } else if (!j)
906                                 printk(" %08x ", *addr);
907                 }
908                 if (!j)
909                         printk("\n");
910         }
911 #endif
912 }
913
914 void dump_stack(void)
915 {
916         unsigned long stack;
917 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
918         int tflags;
919 #endif
920         trace_buffer_save(tflags);
921         dump_bfin_trace_buffer();
922         show_stack(current, &stack);
923         trace_buffer_restore(tflags);
924 }
925 EXPORT_SYMBOL(dump_stack);
926
927 void dump_bfin_process(struct pt_regs *fp)
928 {
929 #ifdef CONFIG_DEBUG_VERBOSE
930         /* We should be able to look at fp->ipend, but we don't push it on the
931          * stack all the time, so do this until we fix that */
932         unsigned int context = bfin_read_IPEND();
933
934         if (oops_in_progress)
935                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
936
937         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
938                 verbose_printk(KERN_NOTICE "HW Error context\n");
939         else if (context & 0x0020)
940                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
941         else if (context & 0x3FC0)
942                 verbose_printk(KERN_NOTICE "Interrupt context\n");
943         else if (context & 0x4000)
944                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
945         else if (context & 0x8000)
946                 verbose_printk(KERN_NOTICE "Kernel process context\n");
947
948         /* Because we are crashing, and pointers could be bad, we check things
949          * pretty closely before we use them
950          */
951         if ((unsigned long)current >= FIXED_CODE_START &&
952             !((unsigned long)current & 0x3) && current->pid) {
953                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
954                 if (current->comm >= (char *)FIXED_CODE_START)
955                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
956                                 current->comm, current->pid);
957                 else
958                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
959
960                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
961                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
962                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
963                                 KERN_NOTICE "\n",
964                                 (void *)current->mm->start_code,
965                                 (void *)current->mm->end_code,
966                                 (void *)current->mm->start_data,
967                                 (void *)current->mm->end_data,
968                                 (void *)current->mm->end_data,
969                                 (void *)current->mm->brk,
970                                 (void *)current->mm->start_stack);
971                 else
972                         verbose_printk(KERN_NOTICE "invalid mm\n");
973         } else
974                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
975                      "No Valid process in current context\n");
976 #endif
977 }
978
979 void dump_bfin_mem(struct pt_regs *fp)
980 {
981 #ifdef CONFIG_DEBUG_VERBOSE
982         unsigned short *addr, *erraddr, val = 0, err = 0;
983         char sti = 0, buf[6];
984
985         erraddr = (void *)fp->pc;
986
987         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
988
989         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
990              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
991              addr++) {
992                 if (!((unsigned long)addr & 0xF))
993                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
994
995                 if (!get_instruction(&val, addr)) {
996                                 val = 0;
997                                 sprintf(buf, "????");
998                 } else
999                         sprintf(buf, "%04x", val);
1000
1001                 if (addr == erraddr) {
1002                         verbose_printk("[%s]", buf);
1003                         err = val;
1004                 } else
1005                         verbose_printk(" %s ", buf);
1006
1007                 /* Do any previous instructions turn on interrupts? */
1008                 if (addr <= erraddr &&                          /* in the past */
1009                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1010                       val == 0x017b))                           /* [SP++] = RETI */
1011                         sti = 1;
1012         }
1013
1014         verbose_printk("\n");
1015
1016         /* Hardware error interrupts can be deferred */
1017         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1018             oops_in_progress)){
1019                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1020 #ifndef CONFIG_DEBUG_HWERR
1021                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1022                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1023                          " better idea where it came from\n");
1024 #else
1025                 /* If we are handling only one peripheral interrupt
1026                  * and current mm and pid are valid, and the last error
1027                  * was in that user space process's text area
1028                  * print it out - because that is where the problem exists
1029                  */
1030                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1031                      (current->pid && current->mm)) {
1032                         /* And the last RETI points to the current userspace context */
1033                         if ((fp + 1)->pc >= current->mm->start_code &&
1034                             (fp + 1)->pc <= current->mm->end_code) {
1035                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1036                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1037                                 show_regs(fp + 1);
1038                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1039                         }
1040                 }
1041 #endif
1042         }
1043 #endif
1044 }
1045
1046 void show_regs(struct pt_regs *fp)
1047 {
1048 #ifdef CONFIG_DEBUG_VERBOSE
1049         char buf [150];
1050         struct irqaction *action;
1051         unsigned int i;
1052         unsigned long flags;
1053
1054         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1055         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1056                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1057         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1058                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1059                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1060 #ifdef EBIU_ERRMST
1061                 /* If the error was from the EBIU, print it out */
1062                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1063                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1064                                 bfin_read_EBIU_ERRMST());
1065                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1066                                 bfin_read_EBIU_ERRADD());
1067                 }
1068 #endif
1069         }
1070         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1071                 fp->seqstat & SEQSTAT_EXCAUSE);
1072         for (i = 6; i <= 15 ; i++) {
1073                 if (fp->ipend & (1 << i)) {
1074                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1075                         verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1076                 }
1077         }
1078
1079         /* if no interrupts are going off, don't print this out */
1080         if (fp->ipend & ~0x3F) {
1081                 for (i = 0; i < (NR_IRQS - 1); i++) {
1082                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1083                         action = irq_desc[i].action;
1084                         if (!action)
1085                                 goto unlock;
1086
1087                         decode_address(buf, (unsigned int)action->handler);
1088                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1089                         for (action = action->next; action; action = action->next) {
1090                                 decode_address(buf, (unsigned int)action->handler);
1091                                 verbose_printk(", %s", buf);
1092                         }
1093                         verbose_printk("\n");
1094 unlock:
1095                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1096                 }
1097         }
1098
1099         decode_address(buf, fp->rete);
1100         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1101         decode_address(buf, fp->retn);
1102         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1103         decode_address(buf, fp->retx);
1104         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1105         decode_address(buf, fp->rets);
1106         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1107         decode_address(buf, fp->pc);
1108         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1109
1110         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1111             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1112                 decode_address(buf, saved_dcplb_fault_addr);
1113                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1114                 decode_address(buf, saved_icplb_fault_addr);
1115                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1116         }
1117
1118         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1119         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1120                 fp->r0, fp->r1, fp->r2, fp->r3);
1121         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1122                 fp->r4, fp->r5, fp->r6, fp->r7);
1123         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1124                 fp->p0, fp->p1, fp->p2, fp->p3);
1125         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1126                 fp->p4, fp->p5, fp->fp, (long)fp);
1127         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1128                 fp->lb0, fp->lt0, fp->lc0);
1129         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1130                 fp->lb1, fp->lt1, fp->lc1);
1131         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1132                 fp->b0, fp->l0, fp->m0, fp->i0);
1133         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1134                 fp->b1, fp->l1, fp->m1, fp->i1);
1135         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1136                 fp->b2, fp->l2, fp->m2, fp->i2);
1137         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1138                 fp->b3, fp->l3, fp->m3, fp->i3);
1139         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1140                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1141
1142         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1143                 rdusp(), fp->astat);
1144
1145         verbose_printk(KERN_NOTICE "\n");
1146 #endif
1147 }
1148
1149 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1150 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1151 #endif
1152
1153 asmlinkage int sys_bfin_spinlock(int *spinlock)
1154 {
1155         int ret = 0;
1156         int tmp = 0;
1157
1158         local_irq_disable();
1159         ret = get_user(tmp, spinlock);
1160         if (ret == 0) {
1161                 if (tmp)
1162                         ret = 1;
1163                 tmp = 1;
1164                 put_user(tmp, spinlock);
1165         }
1166         local_irq_enable();
1167         return ret;
1168 }
1169
1170 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1171 {
1172         void (*curr_handler)(void);
1173
1174         if (exception > 0x3F)
1175                 return -EINVAL;
1176
1177         curr_handler = ex_table[exception];
1178
1179         if (curr_handler != ex_replaceable)
1180                 return -EBUSY;
1181
1182         ex_table[exception] = handler;
1183
1184         return 0;
1185 }
1186 EXPORT_SYMBOL(bfin_request_exception);
1187
1188 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1189 {
1190         void (*curr_handler)(void);
1191
1192         if (exception > 0x3F)
1193                 return -EINVAL;
1194
1195         curr_handler = ex_table[exception];
1196
1197         if (curr_handler != handler)
1198                 return -EBUSY;
1199
1200         ex_table[exception] = ex_replaceable;
1201
1202         return 0;
1203 }
1204 EXPORT_SYMBOL(bfin_free_exception);
1205
1206 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1207 {
1208         switch (cplb_panic) {
1209         case CPLB_NO_UNLOCKED:
1210                 printk(KERN_EMERG "All CPLBs are locked\n");
1211                 break;
1212         case CPLB_PROT_VIOL:
1213                 return;
1214         case CPLB_NO_ADDR_MATCH:
1215                 return;
1216         case CPLB_UNKNOWN_ERR:
1217                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1218                 break;
1219         }
1220
1221         oops_in_progress = 1;
1222
1223         dump_bfin_process(fp);
1224         dump_bfin_mem(fp);
1225         show_regs(fp);
1226         dump_stack();
1227         panic("Unrecoverable event\n");
1228 }