Merge commit 'v2.6.28-rc6' into core/debug
[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_DEBUG_VERBOSE
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                                         char *d_name = d_path(&file->f_path, _tmpbuf,
152                                                       sizeof(_tmpbuf));
153                                         if (!IS_ERR(d_name))
154                                                 name = d_name;
155                                 }
156
157                                 /* FLAT does not have its text aligned to the start of
158                                  * the map while FDPIC ELF does ...
159                                  */
160
161                                 /* before we can check flat/fdpic, we need to
162                                  * make sure current is valid
163                                  */
164                                 if ((unsigned long)current >= FIXED_CODE_START &&
165                                     !((unsigned long)current & 0x3)) {
166                                         if (current->mm &&
167                                             (address > current->mm->start_code) &&
168                                             (address < current->mm->end_code))
169                                                 offset = address - current->mm->start_code;
170                                         else
171                                                 offset = (address - vma->vm_start) +
172                                                          (vma->vm_pgoff << PAGE_SHIFT);
173
174                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
175                                                 (void *)address, name, offset);
176                                 } else
177                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
178                                                 (void *)address, name,
179                                                 vma->vm_start, vma->vm_end);
180
181                                 if (!in_atomic)
182                                         mmput(mm);
183
184                                 if (!strlen(buf))
185                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
186
187                                 goto done;
188                         }
189
190                         vml = vml->next;
191                 }
192                 if (!in_atomic)
193                         mmput(mm);
194         }
195
196         /* we were unable to find this address anywhere */
197         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
198
199 done:
200         write_unlock_irqrestore(&tasklist_lock, flags);
201 #else
202         sprintf(buf, " ");
203 #endif
204 }
205
206 asmlinkage void double_fault_c(struct pt_regs *fp)
207 {
208         console_verbose();
209         oops_in_progress = 1;
210 #ifdef CONFIG_DEBUG_VERBOSE
211         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
212 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
213         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
214                 char buf[150];
215                 decode_address(buf, saved_retx);
216                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
217                         (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
218                 decode_address(buf, saved_dcplb_fault_addr);
219                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
220                 decode_address(buf, saved_icplb_fault_addr);
221                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
222
223                 decode_address(buf, fp->retx);
224                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
225                         buf);
226         } else
227 #endif
228         {
229                 dump_bfin_process(fp);
230                 dump_bfin_mem(fp);
231                 show_regs(fp);
232         }
233 #endif
234         panic("Double Fault - unrecoverable event\n");
235
236 }
237
238 asmlinkage void trap_c(struct pt_regs *fp)
239 {
240 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
241         int j;
242 #endif
243         int sig = 0;
244         siginfo_t info;
245         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
246
247         trace_buffer_save(j);
248
249         /* Important - be very careful dereferncing pointers - will lead to
250          * double faults if the stack has become corrupt
251          */
252
253         /* If the fault was caused by a kernel thread, or interrupt handler
254          * we will kernel panic, so the system reboots.
255          * If KGDB is enabled, don't set this for kernel breakpoints
256         */
257
258         /* TODO: check to see if we are in some sort of deferred HWERR
259          * that we should be able to recover from, not kernel panic
260          */
261         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
262 #ifdef CONFIG_KGDB
263                 && (trapnr != VEC_EXCPT02)
264 #endif
265         ){
266                 console_verbose();
267                 oops_in_progress = 1;
268         } else if (current) {
269                 if (current->mm == NULL) {
270                         console_verbose();
271                         oops_in_progress = 1;
272                 }
273         }
274
275         /* trap_c() will be called for exceptions. During exceptions
276          * processing, the pc value should be set with retx value.
277          * With this change we can cleanup some code in signal.c- TODO
278          */
279         fp->orig_pc = fp->retx;
280         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
281                 trapnr, fp->ipend, fp->pc, fp->retx); */
282
283         /* send the appropriate signal to the user program */
284         switch (trapnr) {
285
286         /* This table works in conjuction with the one in ./mach-common/entry.S
287          * Some exceptions are handled there (in assembly, in exception space)
288          * Some are handled here, (in C, in interrupt space)
289          * Some, like CPLB, are handled in both, where the normal path is
290          * handled in assembly/exception space, and the error path is handled
291          * here
292          */
293
294         /* 0x00 - Linux Syscall, getting here is an error */
295         /* 0x01 - userspace gdb breakpoint, handled here */
296         case VEC_EXCPT01:
297                 info.si_code = TRAP_ILLTRAP;
298                 sig = SIGTRAP;
299                 CHK_DEBUGGER_TRAP_MAYBE();
300                 /* Check if this is a breakpoint in kernel space */
301                 if (fp->ipend & 0xffc0)
302                         return;
303                 else
304                         break;
305         /* 0x03 - User Defined, userspace stack overflow */
306         case VEC_EXCPT03:
307                 info.si_code = SEGV_STACKFLOW;
308                 sig = SIGSEGV;
309                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
310                 CHK_DEBUGGER_TRAP_MAYBE();
311                 break;
312         /* 0x02 - KGDB initial connection and break signal trap */
313         case VEC_EXCPT02:
314 #ifdef CONFIG_KGDB
315                 info.si_code = TRAP_ILLTRAP;
316                 sig = SIGTRAP;
317                 CHK_DEBUGGER_TRAP();
318                 return;
319 #endif
320         /* 0x04 - User Defined */
321         /* 0x05 - User Defined */
322         /* 0x06 - User Defined */
323         /* 0x07 - User Defined */
324         /* 0x08 - User Defined */
325         /* 0x09 - User Defined */
326         /* 0x0A - User Defined */
327         /* 0x0B - User Defined */
328         /* 0x0C - User Defined */
329         /* 0x0D - User Defined */
330         /* 0x0E - User Defined */
331         /* 0x0F - User Defined */
332         /* If we got here, it is most likely that someone was trying to use a
333          * custom exception handler, and it is not actually installed properly
334          */
335         case VEC_EXCPT04 ... VEC_EXCPT15:
336                 info.si_code = ILL_ILLPARAOP;
337                 sig = SIGILL;
338                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
339                 CHK_DEBUGGER_TRAP_MAYBE();
340                 break;
341         /* 0x10 HW Single step, handled here */
342         case VEC_STEP:
343                 info.si_code = TRAP_STEP;
344                 sig = SIGTRAP;
345                 CHK_DEBUGGER_TRAP_MAYBE();
346                 /* Check if this is a single step in kernel space */
347                 if (fp->ipend & 0xffc0)
348                         return;
349                 else
350                         break;
351         /* 0x11 - Trace Buffer Full, handled here */
352         case VEC_OVFLOW:
353                 info.si_code = TRAP_TRACEFLOW;
354                 sig = SIGTRAP;
355                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
356                 CHK_DEBUGGER_TRAP_MAYBE();
357                 break;
358         /* 0x12 - Reserved, Caught by default */
359         /* 0x13 - Reserved, Caught by default */
360         /* 0x14 - Reserved, Caught by default */
361         /* 0x15 - Reserved, Caught by default */
362         /* 0x16 - Reserved, Caught by default */
363         /* 0x17 - Reserved, Caught by default */
364         /* 0x18 - Reserved, Caught by default */
365         /* 0x19 - Reserved, Caught by default */
366         /* 0x1A - Reserved, Caught by default */
367         /* 0x1B - Reserved, Caught by default */
368         /* 0x1C - Reserved, Caught by default */
369         /* 0x1D - Reserved, Caught by default */
370         /* 0x1E - Reserved, Caught by default */
371         /* 0x1F - Reserved, Caught by default */
372         /* 0x20 - Reserved, Caught by default */
373         /* 0x21 - Undefined Instruction, handled here */
374         case VEC_UNDEF_I:
375                 info.si_code = ILL_ILLOPC;
376                 sig = SIGILL;
377                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
378                 CHK_DEBUGGER_TRAP_MAYBE();
379                 break;
380         /* 0x22 - Illegal Instruction Combination, handled here */
381         case VEC_ILGAL_I:
382                 info.si_code = ILL_ILLPARAOP;
383                 sig = SIGILL;
384                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
385                 CHK_DEBUGGER_TRAP_MAYBE();
386                 break;
387         /* 0x23 - Data CPLB protection violation, handled here */
388         case VEC_CPLB_VL:
389                 info.si_code = ILL_CPLB_VI;
390                 sig = SIGBUS;
391                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
392                 CHK_DEBUGGER_TRAP_MAYBE();
393                 break;
394         /* 0x24 - Data access misaligned, handled here */
395         case VEC_MISALI_D:
396                 info.si_code = BUS_ADRALN;
397                 sig = SIGBUS;
398                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
399                 CHK_DEBUGGER_TRAP_MAYBE();
400                 break;
401         /* 0x25 - Unrecoverable Event, handled here */
402         case VEC_UNCOV:
403                 info.si_code = ILL_ILLEXCPT;
404                 sig = SIGILL;
405                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
406                 CHK_DEBUGGER_TRAP_MAYBE();
407                 break;
408         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
409                 error case is handled here */
410         case VEC_CPLB_M:
411                 info.si_code = BUS_ADRALN;
412                 sig = SIGBUS;
413                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
414                 break;
415         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
416         case VEC_CPLB_MHIT:
417                 info.si_code = ILL_CPLB_MULHIT;
418                 sig = SIGSEGV;
419 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
420                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
421                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
422                 else
423 #endif
424                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
425                 CHK_DEBUGGER_TRAP_MAYBE();
426                 break;
427         /* 0x28 - Emulation Watchpoint, handled here */
428         case VEC_WATCH:
429                 info.si_code = TRAP_WATCHPT;
430                 sig = SIGTRAP;
431                 pr_debug(EXC_0x28(KERN_DEBUG));
432                 CHK_DEBUGGER_TRAP_MAYBE();
433                 /* Check if this is a watchpoint in kernel space */
434                 if (fp->ipend & 0xffc0)
435                         return;
436                 else
437                         break;
438 #ifdef CONFIG_BF535
439         /* 0x29 - Instruction fetch access error (535 only) */
440         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
441                 info.si_code = BUS_OPFETCH;
442                 sig = SIGBUS;
443                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
444                 CHK_DEBUGGER_TRAP_MAYBE();
445                 break;
446 #else
447         /* 0x29 - Reserved, Caught by default */
448 #endif
449         /* 0x2A - Instruction fetch misaligned, handled here */
450         case VEC_MISALI_I:
451                 info.si_code = BUS_ADRALN;
452                 sig = SIGBUS;
453                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
454                 CHK_DEBUGGER_TRAP_MAYBE();
455                 break;
456         /* 0x2B - Instruction CPLB protection violation, handled here */
457         case VEC_CPLB_I_VL:
458                 info.si_code = ILL_CPLB_VI;
459                 sig = SIGBUS;
460                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
461                 CHK_DEBUGGER_TRAP_MAYBE();
462                 break;
463         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
464         case VEC_CPLB_I_M:
465                 info.si_code = ILL_CPLB_MISS;
466                 sig = SIGBUS;
467                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
468                 break;
469         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
470         case VEC_CPLB_I_MHIT:
471                 info.si_code = ILL_CPLB_MULHIT;
472                 sig = SIGSEGV;
473 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
474                 if (saved_icplb_fault_addr < FIXED_CODE_START)
475                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
476                 else
477 #endif
478                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
479                 CHK_DEBUGGER_TRAP_MAYBE();
480                 break;
481         /* 0x2E - Illegal use of Supervisor Resource, handled here */
482         case VEC_ILL_RES:
483                 info.si_code = ILL_PRVOPC;
484                 sig = SIGILL;
485                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
486                 CHK_DEBUGGER_TRAP_MAYBE();
487                 break;
488         /* 0x2F - Reserved, Caught by default */
489         /* 0x30 - Reserved, Caught by default */
490         /* 0x31 - Reserved, Caught by default */
491         /* 0x32 - Reserved, Caught by default */
492         /* 0x33 - Reserved, Caught by default */
493         /* 0x34 - Reserved, Caught by default */
494         /* 0x35 - Reserved, Caught by default */
495         /* 0x36 - Reserved, Caught by default */
496         /* 0x37 - Reserved, Caught by default */
497         /* 0x38 - Reserved, Caught by default */
498         /* 0x39 - Reserved, Caught by default */
499         /* 0x3A - Reserved, Caught by default */
500         /* 0x3B - Reserved, Caught by default */
501         /* 0x3C - Reserved, Caught by default */
502         /* 0x3D - Reserved, Caught by default */
503         /* 0x3E - Reserved, Caught by default */
504         /* 0x3F - Reserved, Caught by default */
505         case VEC_HWERR:
506                 info.si_code = BUS_ADRALN;
507                 sig = SIGBUS;
508                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
509                 /* System MMR Error */
510                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
511                         info.si_code = BUS_ADRALN;
512                         sig = SIGBUS;
513                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
514                         break;
515                 /* External Memory Addressing Error */
516                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
517                         info.si_code = BUS_ADRERR;
518                         sig = SIGBUS;
519                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
520                         break;
521                 /* Performance Monitor Overflow */
522                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
523                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
524                         break;
525                 /* RAISE 5 instruction */
526                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
527                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
528                         break;
529                 default:        /* Reserved */
530                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
531                         break;
532                 }
533                 CHK_DEBUGGER_TRAP_MAYBE();
534                 break;
535         /*
536          * We should be handling all known exception types above,
537          * if we get here we hit a reserved one, so panic
538          */
539         default:
540                 oops_in_progress = 1;
541                 info.si_code = ILL_ILLPARAOP;
542                 sig = SIGILL;
543                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
544                         (fp->seqstat & SEQSTAT_EXCAUSE));
545                 CHK_DEBUGGER_TRAP_MAYBE();
546                 break;
547         }
548
549         BUG_ON(sig == 0);
550
551         if (sig != SIGTRAP) {
552                 dump_bfin_process(fp);
553                 dump_bfin_mem(fp);
554                 show_regs(fp);
555
556                 /* Print out the trace buffer if it makes sense */
557 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
558                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
559                         verbose_printk(KERN_NOTICE "No trace since you do not have "
560                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
561                                 KERN_NOTICE "\n");
562                 else
563 #endif
564                         dump_bfin_trace_buffer();
565
566                 if (oops_in_progress) {
567                         /* Dump the current kernel stack */
568                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
569                         show_stack(current, NULL);
570                         print_modules();
571 #ifndef CONFIG_ACCESS_CHECK
572                         verbose_printk(KERN_EMERG "Please turn on "
573                                "CONFIG_ACCESS_CHECK\n");
574 #endif
575                         panic("Kernel exception");
576                 } else {
577 #ifdef CONFIG_DEBUG_VERBOSE
578                         unsigned long *stack;
579                         /* Dump the user space stack */
580                         stack = (unsigned long *)rdusp();
581                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
582                         show_stack(NULL, stack);
583 #endif
584                 }
585         }
586
587         info.si_signo = sig;
588         info.si_errno = 0;
589         info.si_addr = (void __user *)fp->pc;
590         force_sig_info(sig, &info, current);
591
592         trace_buffer_restore(j);
593         return;
594 }
595
596 /* Typical exception handling routines  */
597
598 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
599
600 /*
601  * Similar to get_user, do some address checking, then dereference
602  * Return true on sucess, false on bad address
603  */
604 static bool get_instruction(unsigned short *val, unsigned short *address)
605 {
606
607         unsigned long addr;
608
609         addr = (unsigned long)address;
610
611         /* Check for odd addresses */
612         if (addr & 0x1)
613                 return false;
614
615         /* Check that things do not wrap around */
616         if (addr > (addr + 2))
617                 return false;
618
619         /*
620          * Since we are in exception context, we need to do a little address checking
621          * We need to make sure we are only accessing valid memory, and
622          * we don't read something in the async space that can hang forever
623          */
624         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
625 #if L2_LENGTH != 0
626             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
627 #endif
628             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
629 #if L1_DATA_A_LENGTH != 0
630             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
631 #endif
632 #if L1_DATA_B_LENGTH != 0
633             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
634 #endif
635             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
636             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
637                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
638             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
639                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
640             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
641                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
642             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
643               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
644                 *val = *address;
645                 return true;
646         }
647
648 #if L1_CODE_LENGTH != 0
649         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
650                 isram_memcpy(val, address, 2);
651                 return true;
652         }
653 #endif
654
655
656         return false;
657 }
658
659 /* 
660  * decode the instruction if we are printing out the trace, as it
661  * makes things easier to follow, without running it through objdump
662  * These are the normal instructions which cause change of flow, which
663  * would be at the source of the trace buffer
664  */
665 #ifdef CONFIG_DEBUG_VERBOSE
666 static void decode_instruction(unsigned short *address)
667 {
668         unsigned short opcode;
669
670         if (get_instruction(&opcode, address)) {
671                 if (opcode == 0x0010)
672                         verbose_printk("RTS");
673                 else if (opcode == 0x0011)
674                         verbose_printk("RTI");
675                 else if (opcode == 0x0012)
676                         verbose_printk("RTX");
677                 else if (opcode >= 0x0050 && opcode <= 0x0057)
678                         verbose_printk("JUMP (P%i)", opcode & 7);
679                 else if (opcode >= 0x0060 && opcode <= 0x0067)
680                         verbose_printk("CALL (P%i)", opcode & 7);
681                 else if (opcode >= 0x0070 && opcode <= 0x0077)
682                         verbose_printk("CALL (PC+P%i)", opcode & 7);
683                 else if (opcode >= 0x0080 && opcode <= 0x0087)
684                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
685                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
686                         verbose_printk("IF !CC JUMP");
687                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
688                         verbose_printk("IF CC JUMP");
689                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
690                         verbose_printk("JUMP.S");
691                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
692                         verbose_printk("LSETUP");
693                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
694                         verbose_printk("JUMP.L");
695                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
696                         verbose_printk("CALL pcrel");
697                 else
698                         verbose_printk("0x%04x", opcode);
699         }
700
701 }
702 #endif
703
704 void dump_bfin_trace_buffer(void)
705 {
706 #ifdef CONFIG_DEBUG_VERBOSE
707 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
708         int tflags, i = 0;
709         char buf[150];
710         unsigned short *addr;
711 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
712         int j, index;
713 #endif
714
715         trace_buffer_save(tflags);
716
717         printk(KERN_NOTICE "Hardware Trace:\n");
718
719 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
720         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
721 #endif
722
723         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
724                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
725                         decode_address(buf, (unsigned long)bfin_read_TBUF());
726                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
727                         addr = (unsigned short *)bfin_read_TBUF();
728                         decode_address(buf, (unsigned long)addr);
729                         printk(KERN_NOTICE "     Source : %s ", buf);
730                         decode_instruction(addr);
731                         printk("\n");
732                 }
733         }
734
735 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
736         if (trace_buff_offset)
737                 index = trace_buff_offset / 4;
738         else
739                 index = EXPAND_LEN;
740
741         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
742         while (j) {
743                 decode_address(buf, software_trace_buff[index]);
744                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
745                 index -= 1;
746                 if (index < 0 )
747                         index = EXPAND_LEN;
748                 decode_address(buf, software_trace_buff[index]);
749                 printk(KERN_NOTICE "     Source : %s ", buf);
750                 decode_instruction((unsigned short *)software_trace_buff[index]);
751                 printk("\n");
752                 index -= 1;
753                 if (index < 0)
754                         index = EXPAND_LEN;
755                 j--;
756                 i++;
757         }
758 #endif
759
760         trace_buffer_restore(tflags);
761 #endif
762 #endif
763 }
764 EXPORT_SYMBOL(dump_bfin_trace_buffer);
765
766 /*
767  * Checks to see if the address pointed to is either a
768  * 16-bit CALL instruction, or a 32-bit CALL instruction
769  */
770 static bool is_bfin_call(unsigned short *addr)
771 {
772         unsigned short opcode = 0, *ins_addr;
773         ins_addr = (unsigned short *)addr;
774
775         if (!get_instruction(&opcode, ins_addr))
776                 return false;
777
778         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
779             (opcode >= 0x0070 && opcode <= 0x0077))
780                 return true;
781
782         ins_addr--;
783         if (!get_instruction(&opcode, ins_addr))
784                 return false;
785
786         if (opcode >= 0xE300 && opcode <= 0xE3FF)
787                 return true;
788
789         return false;
790
791 }
792
793 void show_stack(struct task_struct *task, unsigned long *stack)
794 {
795 #ifdef CONFIG_PRINTK
796         unsigned int *addr, *endstack, *fp = 0, *frame;
797         unsigned short *ins_addr;
798         char buf[150];
799         unsigned int i, j, ret_addr, frame_no = 0;
800
801         /*
802          * If we have been passed a specific stack, use that one otherwise
803          *    if we have been passed a task structure, use that, otherwise
804          *    use the stack of where the variable "stack" exists
805          */
806
807         if (stack == NULL) {
808                 if (task) {
809                         /* We know this is a kernel stack, so this is the start/end */
810                         stack = (unsigned long *)task->thread.ksp;
811                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
812                 } else {
813                         /* print out the existing stack info */
814                         stack = (unsigned long *)&stack;
815                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
816                 }
817         } else
818                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
819
820         printk(KERN_NOTICE "Stack info:\n");
821         decode_address(buf, (unsigned int)stack);
822         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
823
824         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
825
826         /* First thing is to look for a frame pointer */
827         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
828                 addr < endstack; addr++, i++) {
829                 if (*addr & 0x1)
830                         continue;
831                 ins_addr = (unsigned short *)*addr;
832                 ins_addr--;
833                 if (is_bfin_call(ins_addr))
834                         fp = addr - 1;
835
836                 if (fp) {
837                         /* Let's check to see if it is a frame pointer */
838                         while (fp >= (addr - 1) && fp < endstack && fp)
839                                 fp = (unsigned int *)*fp;
840                         if (fp == 0 || fp == endstack) {
841                                 fp = addr - 1;
842                                 break;
843                         }
844                         fp = 0;
845                 }
846         }
847         if (fp) {
848                 frame = fp;
849                 printk(" FP: (0x%p)\n", fp);
850         } else
851                 frame = 0;
852
853         /*
854          * Now that we think we know where things are, we
855          * walk the stack again, this time printing things out
856          * incase there is no frame pointer, we still look for
857          * valid return addresses
858          */
859
860         /* First time print out data, next time, print out symbols */
861         for (j = 0; j <= 1; j++) {
862                 if (j)
863                         printk(KERN_NOTICE "Return addresses in stack:\n");
864                 else
865                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
866
867                 fp = frame;
868                 frame_no = 0;
869
870                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
871                      addr <= endstack; addr++, i++) {
872
873                         ret_addr = 0;
874                         if (!j && i % 8 == 0)
875                                 printk("\n" KERN_NOTICE "%p:",addr);
876
877                         /* if it is an odd address, or zero, just skip it */
878                         if (*addr & 0x1 || !*addr)
879                                 goto print;
880
881                         ins_addr = (unsigned short *)*addr;
882
883                         /* Go back one instruction, and see if it is a CALL */
884                         ins_addr--;
885                         ret_addr = is_bfin_call(ins_addr);
886  print:
887                         if (!j && stack == (unsigned long *)addr)
888                                 printk("[%08x]", *addr);
889                         else if (ret_addr)
890                                 if (j) {
891                                         decode_address(buf, (unsigned int)*addr);
892                                         if (frame == addr) {
893                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
894                                                 continue;
895                                         }
896                                         printk(KERN_NOTICE "    address : %s\n", buf);
897                                 } else
898                                         printk("<%08x>", *addr);
899                         else if (fp == addr) {
900                                 if (j)
901                                         frame = addr+1;
902                                 else
903                                         printk("(%08x)", *addr);
904
905                                 fp = (unsigned int *)*addr;
906                                 frame_no++;
907
908                         } else if (!j)
909                                 printk(" %08x ", *addr);
910                 }
911                 if (!j)
912                         printk("\n");
913         }
914 #endif
915 }
916
917 void dump_stack(void)
918 {
919         unsigned long stack;
920 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
921         int tflags;
922 #endif
923         trace_buffer_save(tflags);
924         dump_bfin_trace_buffer();
925         show_stack(current, &stack);
926         trace_buffer_restore(tflags);
927 }
928 EXPORT_SYMBOL(dump_stack);
929
930 void dump_bfin_process(struct pt_regs *fp)
931 {
932 #ifdef CONFIG_DEBUG_VERBOSE
933         /* We should be able to look at fp->ipend, but we don't push it on the
934          * stack all the time, so do this until we fix that */
935         unsigned int context = bfin_read_IPEND();
936
937         if (oops_in_progress)
938                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
939
940         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
941                 verbose_printk(KERN_NOTICE "HW Error context\n");
942         else if (context & 0x0020)
943                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
944         else if (context & 0x3FC0)
945                 verbose_printk(KERN_NOTICE "Interrupt context\n");
946         else if (context & 0x4000)
947                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
948         else if (context & 0x8000)
949                 verbose_printk(KERN_NOTICE "Kernel process context\n");
950
951         /* Because we are crashing, and pointers could be bad, we check things
952          * pretty closely before we use them
953          */
954         if ((unsigned long)current >= FIXED_CODE_START &&
955             !((unsigned long)current & 0x3) && current->pid) {
956                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
957                 if (current->comm >= (char *)FIXED_CODE_START)
958                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
959                                 current->comm, current->pid);
960                 else
961                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
962
963                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
964                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
965                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
966                                 KERN_NOTICE "\n",
967                                 (void *)current->mm->start_code,
968                                 (void *)current->mm->end_code,
969                                 (void *)current->mm->start_data,
970                                 (void *)current->mm->end_data,
971                                 (void *)current->mm->end_data,
972                                 (void *)current->mm->brk,
973                                 (void *)current->mm->start_stack);
974                 else
975                         verbose_printk(KERN_NOTICE "invalid mm\n");
976         } else
977                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
978                      "No Valid process in current context\n");
979 #endif
980 }
981
982 void dump_bfin_mem(struct pt_regs *fp)
983 {
984 #ifdef CONFIG_DEBUG_VERBOSE
985         unsigned short *addr, *erraddr, val = 0, err = 0;
986         char sti = 0, buf[6];
987
988         erraddr = (void *)fp->pc;
989
990         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
991
992         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
993              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
994              addr++) {
995                 if (!((unsigned long)addr & 0xF))
996                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
997
998                 if (!get_instruction(&val, addr)) {
999                                 val = 0;
1000                                 sprintf(buf, "????");
1001                 } else
1002                         sprintf(buf, "%04x", val);
1003
1004                 if (addr == erraddr) {
1005                         verbose_printk("[%s]", buf);
1006                         err = val;
1007                 } else
1008                         verbose_printk(" %s ", buf);
1009
1010                 /* Do any previous instructions turn on interrupts? */
1011                 if (addr <= erraddr &&                          /* in the past */
1012                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1013                       val == 0x017b))                           /* [SP++] = RETI */
1014                         sti = 1;
1015         }
1016
1017         verbose_printk("\n");
1018
1019         /* Hardware error interrupts can be deferred */
1020         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1021             oops_in_progress)){
1022                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1023 #ifndef CONFIG_DEBUG_HWERR
1024                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1025                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1026                          " better idea where it came from\n");
1027 #else
1028                 /* If we are handling only one peripheral interrupt
1029                  * and current mm and pid are valid, and the last error
1030                  * was in that user space process's text area
1031                  * print it out - because that is where the problem exists
1032                  */
1033                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1034                      (current->pid && current->mm)) {
1035                         /* And the last RETI points to the current userspace context */
1036                         if ((fp + 1)->pc >= current->mm->start_code &&
1037                             (fp + 1)->pc <= current->mm->end_code) {
1038                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1039                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1040                                 show_regs(fp + 1);
1041                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1042                         }
1043                 }
1044 #endif
1045         }
1046 #endif
1047 }
1048
1049 void show_regs(struct pt_regs *fp)
1050 {
1051 #ifdef CONFIG_DEBUG_VERBOSE
1052         char buf [150];
1053         struct irqaction *action;
1054         unsigned int i;
1055         unsigned long flags;
1056
1057         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1058         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1059                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1060         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1061                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1062                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1063 #ifdef EBIU_ERRMST
1064                 /* If the error was from the EBIU, print it out */
1065                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1066                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1067                                 bfin_read_EBIU_ERRMST());
1068                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1069                                 bfin_read_EBIU_ERRADD());
1070                 }
1071 #endif
1072         }
1073         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1074                 fp->seqstat & SEQSTAT_EXCAUSE);
1075         for (i = 6; i <= 15 ; i++) {
1076                 if (fp->ipend & (1 << i)) {
1077                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1078                         verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1079                 }
1080         }
1081
1082         /* if no interrupts are going off, don't print this out */
1083         if (fp->ipend & ~0x3F) {
1084                 for (i = 0; i < (NR_IRQS - 1); i++) {
1085                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1086                         action = irq_desc[i].action;
1087                         if (!action)
1088                                 goto unlock;
1089
1090                         decode_address(buf, (unsigned int)action->handler);
1091                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1092                         for (action = action->next; action; action = action->next) {
1093                                 decode_address(buf, (unsigned int)action->handler);
1094                                 verbose_printk(", %s", buf);
1095                         }
1096                         verbose_printk("\n");
1097 unlock:
1098                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1099                 }
1100         }
1101
1102         decode_address(buf, fp->rete);
1103         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1104         decode_address(buf, fp->retn);
1105         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1106         decode_address(buf, fp->retx);
1107         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1108         decode_address(buf, fp->rets);
1109         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1110         decode_address(buf, fp->pc);
1111         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1112
1113         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1114             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1115                 decode_address(buf, saved_dcplb_fault_addr);
1116                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1117                 decode_address(buf, saved_icplb_fault_addr);
1118                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1119         }
1120
1121         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1122         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1123                 fp->r0, fp->r1, fp->r2, fp->r3);
1124         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1125                 fp->r4, fp->r5, fp->r6, fp->r7);
1126         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1127                 fp->p0, fp->p1, fp->p2, fp->p3);
1128         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1129                 fp->p4, fp->p5, fp->fp, (long)fp);
1130         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1131                 fp->lb0, fp->lt0, fp->lc0);
1132         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1133                 fp->lb1, fp->lt1, fp->lc1);
1134         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1135                 fp->b0, fp->l0, fp->m0, fp->i0);
1136         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1137                 fp->b1, fp->l1, fp->m1, fp->i1);
1138         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1139                 fp->b2, fp->l2, fp->m2, fp->i2);
1140         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1141                 fp->b3, fp->l3, fp->m3, fp->i3);
1142         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1143                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1144
1145         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1146                 rdusp(), fp->astat);
1147
1148         verbose_printk(KERN_NOTICE "\n");
1149 #endif
1150 }
1151
1152 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1153 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1154 #endif
1155
1156 asmlinkage int sys_bfin_spinlock(int *spinlock)
1157 {
1158         int ret = 0;
1159         int tmp = 0;
1160
1161         local_irq_disable();
1162         ret = get_user(tmp, spinlock);
1163         if (ret == 0) {
1164                 if (tmp)
1165                         ret = 1;
1166                 tmp = 1;
1167                 put_user(tmp, spinlock);
1168         }
1169         local_irq_enable();
1170         return ret;
1171 }
1172
1173 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1174 {
1175         void (*curr_handler)(void);
1176
1177         if (exception > 0x3F)
1178                 return -EINVAL;
1179
1180         curr_handler = ex_table[exception];
1181
1182         if (curr_handler != ex_replaceable)
1183                 return -EBUSY;
1184
1185         ex_table[exception] = handler;
1186
1187         return 0;
1188 }
1189 EXPORT_SYMBOL(bfin_request_exception);
1190
1191 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1192 {
1193         void (*curr_handler)(void);
1194
1195         if (exception > 0x3F)
1196                 return -EINVAL;
1197
1198         curr_handler = ex_table[exception];
1199
1200         if (curr_handler != handler)
1201                 return -EBUSY;
1202
1203         ex_table[exception] = ex_replaceable;
1204
1205         return 0;
1206 }
1207 EXPORT_SYMBOL(bfin_free_exception);
1208
1209 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1210 {
1211         switch (cplb_panic) {
1212         case CPLB_NO_UNLOCKED:
1213                 printk(KERN_EMERG "All CPLBs are locked\n");
1214                 break;
1215         case CPLB_PROT_VIOL:
1216                 return;
1217         case CPLB_NO_ADDR_MATCH:
1218                 return;
1219         case CPLB_UNKNOWN_ERR:
1220                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1221                 break;
1222         }
1223
1224         oops_in_progress = 1;
1225
1226         dump_bfin_process(fp);
1227         dump_bfin_mem(fp);
1228         show_regs(fp);
1229         dump_stack();
1230         panic("Unrecoverable event\n");
1231 }