Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[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/blackfin.h>
38 #include <asm/irq_handler.h>
39 #include <asm/trace.h>
40 #include <asm/fixed_code.h>
41
42 #ifdef CONFIG_KGDB
43 # include <linux/debugger.h>
44 # include <linux/kgdb.h>
45
46 # define CHK_DEBUGGER_TRAP() \
47         do { \
48                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
49         } while (0)
50 # define CHK_DEBUGGER_TRAP_MAYBE() \
51         do { \
52                 if (kgdb_connected) \
53                         CHK_DEBUGGER_TRAP(); \
54         } while (0)
55 #else
56 # define CHK_DEBUGGER_TRAP() do { } while (0)
57 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
58 #endif
59
60 /* Initiate the event table handler */
61 void __init trap_init(void)
62 {
63         CSYNC();
64         bfin_write_EVT3(trap);
65         CSYNC();
66 }
67
68 int kstack_depth_to_print = 48;
69
70 static void decode_address(char *buf, unsigned long address)
71 {
72         struct vm_list_struct *vml;
73         struct task_struct *p;
74         struct mm_struct *mm;
75         unsigned long flags, offset;
76         unsigned int in_exception = bfin_read_IPEND() & 0x10;
77
78 #ifdef CONFIG_KALLSYMS
79         unsigned long symsize;
80         const char *symname;
81         char *modname;
82         char *delim = ":";
83         char namebuf[128];
84
85         /* look up the address and see if we are in kernel space */
86         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
87
88         if (symname) {
89                 /* yeah! kernel space! */
90                 if (!modname)
91                         modname = delim = "";
92                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
93                               (void *)address, delim, modname, delim, symname,
94                               (unsigned long)offset);
95                 return;
96
97         }
98 #endif
99
100         /* Problem in fixed code section? */
101         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
102                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
103                 return;
104         }
105
106         /* Problem somewhere before the kernel start address */
107         if (address < CONFIG_BOOT_LOAD) {
108                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
109                 return;
110         }
111
112         /* looks like we're off in user-land, so let's walk all the
113          * mappings of all our processes and see if we can't be a whee
114          * bit more specific
115          */
116         write_lock_irqsave(&tasklist_lock, flags);
117         for_each_process(p) {
118                 mm = (in_exception ? p->mm : get_task_mm(p));
119                 if (!mm)
120                         continue;
121
122                 vml = mm->context.vmlist;
123                 while (vml) {
124                         struct vm_area_struct *vma = vml->vma;
125
126                         if (address >= vma->vm_start && address < vma->vm_end) {
127                                 char *name = p->comm;
128                                 struct file *file = vma->vm_file;
129                                 if (file) {
130                                         char _tmpbuf[256];
131                                         name = d_path(file->f_dentry,
132                                                       file->f_vfsmnt,
133                                                       _tmpbuf,
134                                                       sizeof(_tmpbuf));
135                                 }
136
137                                 /* FLAT does not have its text aligned to the start of
138                                  * the map while FDPIC ELF does ...
139                                  */
140                                 if (current->mm &&
141                                     (address > current->mm->start_code) &&
142                                     (address < current->mm->end_code))
143                                         offset = address - current->mm->start_code;
144                                 else
145                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
146
147                                 sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
148                                         (void *)address, name, offset);
149                                 if (!in_exception)
150                                         mmput(mm);
151                                 goto done;
152                         }
153
154                         vml = vml->next;
155                 }
156                 if (!in_exception)
157                         mmput(mm);
158         }
159
160         /* we were unable to find this address anywhere */
161         sprintf(buf, "[<0x%p>]", (void *)address);
162
163 done:
164         write_unlock_irqrestore(&tasklist_lock, flags);
165 }
166
167 asmlinkage void double_fault_c(struct pt_regs *fp)
168 {
169         console_verbose();
170         oops_in_progress = 1;
171         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
172         dump_bfin_regs(fp, (void *)fp->retx);
173         panic("Double Fault - unrecoverable event\n");
174
175 }
176
177 asmlinkage void trap_c(struct pt_regs *fp)
178 {
179 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
180         int j;
181 #endif
182         int sig = 0;
183         siginfo_t info;
184         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
185
186         trace_buffer_save(j);
187
188         /* Important - be very careful dereferncing pointers - will lead to
189          * double faults if the stack has become corrupt
190          */
191
192         /* If the fault was caused by a kernel thread, or interrupt handler
193          * we will kernel panic, so the system reboots.
194          * If KGDB is enabled, don't set this for kernel breakpoints
195         */
196         if ((bfin_read_IPEND() & 0xFFC0)
197 #ifdef CONFIG_KGDB
198                 && trapnr != VEC_EXCPT02
199 #endif
200         ){
201                 console_verbose();
202                 oops_in_progress = 1;
203         } else if (current) {
204                 if (current->mm == NULL) {
205                         console_verbose();
206                         oops_in_progress = 1;
207                 }
208         }
209
210         /* trap_c() will be called for exceptions. During exceptions
211          * processing, the pc value should be set with retx value.
212          * With this change we can cleanup some code in signal.c- TODO
213          */
214         fp->orig_pc = fp->retx;
215         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
216                 trapnr, fp->ipend, fp->pc, fp->retx); */
217
218         /* send the appropriate signal to the user program */
219         switch (trapnr) {
220
221         /* This table works in conjuction with the one in ./mach-common/entry.S
222          * Some exceptions are handled there (in assembly, in exception space)
223          * Some are handled here, (in C, in interrupt space)
224          * Some, like CPLB, are handled in both, where the normal path is
225          * handled in assembly/exception space, and the error path is handled
226          * here
227          */
228
229         /* 0x00 - Linux Syscall, getting here is an error */
230         /* 0x01 - userspace gdb breakpoint, handled here */
231         case VEC_EXCPT01:
232                 info.si_code = TRAP_ILLTRAP;
233                 sig = SIGTRAP;
234                 CHK_DEBUGGER_TRAP_MAYBE();
235                 /* Check if this is a breakpoint in kernel space */
236                 if (fp->ipend & 0xffc0)
237                         return;
238                 else
239                         break;
240 #ifdef CONFIG_KGDB
241         case VEC_EXCPT02 :               /* gdb connection */
242                 info.si_code = TRAP_ILLTRAP;
243                 sig = SIGTRAP;
244                 CHK_DEBUGGER_TRAP();
245                 return;
246 #else
247         /* 0x02 - User Defined, Caught by default */
248 #endif
249         /* 0x03 - User Defined, userspace stack overflow */
250         case VEC_EXCPT03:
251                 info.si_code = SEGV_STACKFLOW;
252                 sig = SIGSEGV;
253                 printk(KERN_NOTICE EXC_0x03);
254                 CHK_DEBUGGER_TRAP();
255                 break;
256         /* 0x04 - User Defined, Caught by default */
257         /* 0x05 - User Defined, Caught by default */
258         /* 0x06 - User Defined, Caught by default */
259         /* 0x07 - User Defined, Caught by default */
260         /* 0x08 - User Defined, Caught by default */
261         /* 0x09 - User Defined, Caught by default */
262         /* 0x0A - User Defined, Caught by default */
263         /* 0x0B - User Defined, Caught by default */
264         /* 0x0C - User Defined, Caught by default */
265         /* 0x0D - User Defined, Caught by default */
266         /* 0x0E - User Defined, Caught by default */
267         /* 0x0F - User Defined, Caught by default */
268         /* 0x10 HW Single step, handled here */
269         case VEC_STEP:
270                 info.si_code = TRAP_STEP;
271                 sig = SIGTRAP;
272                 CHK_DEBUGGER_TRAP_MAYBE();
273                 /* Check if this is a single step in kernel space */
274                 if (fp->ipend & 0xffc0)
275                         return;
276                 else
277                         break;
278         /* 0x11 - Trace Buffer Full, handled here */
279         case VEC_OVFLOW:
280                 info.si_code = TRAP_TRACEFLOW;
281                 sig = SIGTRAP;
282                 printk(KERN_NOTICE EXC_0x11);
283                 CHK_DEBUGGER_TRAP();
284                 break;
285         /* 0x12 - Reserved, Caught by default */
286         /* 0x13 - Reserved, Caught by default */
287         /* 0x14 - Reserved, Caught by default */
288         /* 0x15 - Reserved, Caught by default */
289         /* 0x16 - Reserved, Caught by default */
290         /* 0x17 - Reserved, Caught by default */
291         /* 0x18 - Reserved, Caught by default */
292         /* 0x19 - Reserved, Caught by default */
293         /* 0x1A - Reserved, Caught by default */
294         /* 0x1B - Reserved, Caught by default */
295         /* 0x1C - Reserved, Caught by default */
296         /* 0x1D - Reserved, Caught by default */
297         /* 0x1E - Reserved, Caught by default */
298         /* 0x1F - Reserved, Caught by default */
299         /* 0x20 - Reserved, Caught by default */
300         /* 0x21 - Undefined Instruction, handled here */
301         case VEC_UNDEF_I:
302                 info.si_code = ILL_ILLOPC;
303                 sig = SIGILL;
304                 printk(KERN_NOTICE EXC_0x21);
305                 CHK_DEBUGGER_TRAP();
306                 break;
307         /* 0x22 - Illegal Instruction Combination, handled here */
308         case VEC_ILGAL_I:
309                 info.si_code = ILL_ILLPARAOP;
310                 sig = SIGILL;
311                 printk(KERN_NOTICE EXC_0x22);
312                 CHK_DEBUGGER_TRAP();
313                 break;
314         /* 0x23 - Data CPLB Protection Violation,
315                  normal case is handled in _cplb_hdr */
316         case VEC_CPLB_VL:
317                 info.si_code = ILL_CPLB_VI;
318                 sig = SIGILL;
319                 printk(KERN_NOTICE EXC_0x23);
320                 CHK_DEBUGGER_TRAP();
321                 break;
322         /* 0x24 - Data access misaligned, handled here */
323         case VEC_MISALI_D:
324                 info.si_code = BUS_ADRALN;
325                 sig = SIGBUS;
326                 printk(KERN_NOTICE EXC_0x24);
327                 CHK_DEBUGGER_TRAP();
328                 break;
329         /* 0x25 - Unrecoverable Event, handled here */
330         case VEC_UNCOV:
331                 info.si_code = ILL_ILLEXCPT;
332                 sig = SIGILL;
333                 printk(KERN_NOTICE EXC_0x25);
334                 CHK_DEBUGGER_TRAP();
335                 break;
336         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
337                 error case is handled here */
338         case VEC_CPLB_M:
339                 info.si_code = BUS_ADRALN;
340                 sig = SIGBUS;
341                 printk(KERN_NOTICE EXC_0x26);
342                 CHK_DEBUGGER_TRAP();
343                 break;
344         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
345         case VEC_CPLB_MHIT:
346                 info.si_code = ILL_CPLB_MULHIT;
347 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
348                 sig = SIGSEGV;
349                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
350 #else
351                 sig = SIGILL;
352                 printk(KERN_NOTICE EXC_0x27);
353 #endif
354                 CHK_DEBUGGER_TRAP();
355                 break;
356         /* 0x28 - Emulation Watchpoint, handled here */
357         case VEC_WATCH:
358                 info.si_code = TRAP_WATCHPT;
359                 sig = SIGTRAP;
360                 pr_debug(EXC_0x28);
361                 CHK_DEBUGGER_TRAP_MAYBE();
362                 /* Check if this is a watchpoint in kernel space */
363                 if (fp->ipend & 0xffc0)
364                         return;
365                 else
366                         break;
367 #ifdef CONFIG_BF535
368         /* 0x29 - Instruction fetch access error (535 only) */
369         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
370                 info.si_code = BUS_OPFETCH;
371                 sig = SIGBUS;
372                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
373                 CHK_DEBUGGER_TRAP();
374                 break;
375 #else
376         /* 0x29 - Reserved, Caught by default */
377 #endif
378         /* 0x2A - Instruction fetch misaligned, handled here */
379         case VEC_MISALI_I:
380                 info.si_code = BUS_ADRALN;
381                 sig = SIGBUS;
382                 printk(KERN_NOTICE EXC_0x2A);
383                 CHK_DEBUGGER_TRAP();
384                 break;
385         /* 0x2B - Instruction CPLB protection Violation,
386                 handled in _cplb_hdr */
387         case VEC_CPLB_I_VL:
388                 info.si_code = ILL_CPLB_VI;
389                 sig = SIGILL;
390                 printk(KERN_NOTICE EXC_0x2B);
391                 CHK_DEBUGGER_TRAP();
392                 break;
393         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
394         case VEC_CPLB_I_M:
395                 info.si_code = ILL_CPLB_MISS;
396                 sig = SIGBUS;
397                 printk(KERN_NOTICE EXC_0x2C);
398                 CHK_DEBUGGER_TRAP();
399                 break;
400         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
401         case VEC_CPLB_I_MHIT:
402                 info.si_code = ILL_CPLB_MULHIT;
403 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
404                 sig = SIGSEGV;
405                 printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
406 #else
407                 sig = SIGILL;
408                 printk(KERN_NOTICE EXC_0x2D);
409 #endif
410                 CHK_DEBUGGER_TRAP();
411                 break;
412         /* 0x2E - Illegal use of Supervisor Resource, handled here */
413         case VEC_ILL_RES:
414                 info.si_code = ILL_PRVOPC;
415                 sig = SIGILL;
416                 printk(KERN_NOTICE EXC_0x2E);
417                 CHK_DEBUGGER_TRAP();
418                 break;
419         /* 0x2F - Reserved, Caught by default */
420         /* 0x30 - Reserved, Caught by default */
421         /* 0x31 - Reserved, Caught by default */
422         /* 0x32 - Reserved, Caught by default */
423         /* 0x33 - Reserved, Caught by default */
424         /* 0x34 - Reserved, Caught by default */
425         /* 0x35 - Reserved, Caught by default */
426         /* 0x36 - Reserved, Caught by default */
427         /* 0x37 - Reserved, Caught by default */
428         /* 0x38 - Reserved, Caught by default */
429         /* 0x39 - Reserved, Caught by default */
430         /* 0x3A - Reserved, Caught by default */
431         /* 0x3B - Reserved, Caught by default */
432         /* 0x3C - Reserved, Caught by default */
433         /* 0x3D - Reserved, Caught by default */
434         /* 0x3E - Reserved, Caught by default */
435         /* 0x3F - Reserved, Caught by default */
436         default:
437                 info.si_code = TRAP_ILLTRAP;
438                 sig = SIGTRAP;
439                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
440                         (fp->seqstat & SEQSTAT_EXCAUSE));
441                 CHK_DEBUGGER_TRAP();
442                 break;
443         }
444
445         BUG_ON(sig == 0);
446
447         if (sig != SIGTRAP) {
448                 unsigned long stack;
449                 dump_bfin_regs(fp, (void *)fp->retx);
450
451                 /* Print out the trace buffer if it makes sense */
452 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
453                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
454                         printk(KERN_NOTICE "No trace since you do not have "
455                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
456                                 KERN_NOTICE "\n");
457                 else
458 #endif
459                         dump_bfin_trace_buffer();
460                 show_stack(current, &stack);
461                 if (oops_in_progress) {
462 #ifndef CONFIG_ACCESS_CHECK
463                         printk(KERN_EMERG "Hey - dork - please turn on "
464                                 "CONFIG_ACCESS_CHECK\n");
465 #endif
466                         panic("Kernel exception");
467                 }
468
469                 /* Ensure that bad return addresses don't end up in an infinite
470                  * loop, due to speculative loads/reads
471                  */
472                 fp->pc = SAFE_USER_INSTRUCTION;
473         }
474         info.si_signo = sig;
475         info.si_errno = 0;
476         info.si_addr = (void *)fp->pc;
477         force_sig_info(sig, &info, current);
478
479         trace_buffer_restore(j);
480         return;
481 }
482
483 /* Typical exception handling routines  */
484
485 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
486
487 void dump_bfin_trace_buffer(void)
488 {
489 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
490         int tflags, i = 0;
491         char buf[150];
492 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
493         int j, index;
494 #endif
495
496         trace_buffer_save(tflags);
497
498         printk(KERN_NOTICE "Hardware Trace:\n");
499
500         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
501                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
502                         decode_address(buf, (unsigned long)bfin_read_TBUF());
503                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
504                         decode_address(buf, (unsigned long)bfin_read_TBUF());
505                         printk(KERN_NOTICE "     Source : %s\n", buf);
506                 }
507         }
508
509 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
510         if (trace_buff_offset)
511                 index = trace_buff_offset/4 - 1;
512         else
513                 index = EXPAND_LEN;
514
515         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
516         while (j) {
517                 decode_address(buf, software_trace_buff[index]);
518                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
519                 index -= 1;
520                 if (index < 0 )
521                         index = EXPAND_LEN;
522                 decode_address(buf, software_trace_buff[index]);
523                 printk(KERN_NOTICE "     Source : %s\n", buf);
524                 index -= 1;
525                 if (index < 0)
526                         index = EXPAND_LEN;
527                 j--;
528                 i++;
529         }
530 #endif
531
532         trace_buffer_restore(tflags);
533 #endif
534 }
535 EXPORT_SYMBOL(dump_bfin_trace_buffer);
536
537 static void show_trace(struct task_struct *tsk, unsigned long *sp)
538 {
539         unsigned long addr;
540
541         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
542
543         while (!kstack_end(sp)) {
544                 addr = *sp++;
545                 /*
546                  * If the address is either in the text segment of the
547                  * kernel, or in the region which contains vmalloc'ed
548                  * memory, it *may* be the address of a calling
549                  * routine; if so, print it so that someone tracing
550                  * down the cause of the crash will be able to figure
551                  * out the call path that was taken.
552                  */
553                 if (kernel_text_address(addr))
554                         print_ip_sym(addr);
555         }
556
557         printk(KERN_NOTICE "\n");
558 }
559
560 void show_stack(struct task_struct *task, unsigned long *stack)
561 {
562         unsigned long *endstack, addr;
563         int i;
564
565         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
566          * called externally in some places in the kernel.
567          */
568
569         if (!stack) {
570                 if (task)
571                         stack = (unsigned long *)task->thread.ksp;
572                 else
573                         stack = (unsigned long *)&stack;
574         }
575
576         addr = (unsigned long)stack;
577         endstack = (unsigned long *)PAGE_ALIGN(addr);
578
579         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
580         for (i = 0; i < kstack_depth_to_print; i++) {
581                 if (stack + 1 > endstack)
582                         break;
583                 if (i % 8 == 0)
584                         printk("\n" KERN_NOTICE "       ");
585                 printk(" %08lx", *stack++);
586         }
587         printk("\n");
588
589         show_trace(task, stack);
590 }
591
592 void dump_stack(void)
593 {
594         unsigned long stack;
595 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
596         int tflags;
597 #endif
598         trace_buffer_save(tflags);
599         dump_bfin_trace_buffer();
600         show_stack(current, &stack);
601         trace_buffer_restore(tflags);
602 }
603
604 EXPORT_SYMBOL(dump_stack);
605
606 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
607 {
608         char buf [150];
609
610         if (!oops_in_progress) {
611                 if (current->pid && current->mm) {
612                         printk(KERN_NOTICE "\n" KERN_NOTICE "CURRENT PROCESS:\n");
613                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
614                                 current->comm, current->pid);
615
616                         printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
617                                 KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
618                                 KERN_NOTICE "\n",
619                                 (void *)current->mm->start_code,
620                                 (void *)current->mm->end_code,
621                                 (void *)current->mm->start_data,
622                                 (void *)current->mm->end_data,
623                                 (void *)current->mm->end_data,
624                                 (void *)current->mm->brk,
625                                 (void *)current->mm->start_stack);
626                 } else {
627                         printk (KERN_NOTICE "\n" KERN_NOTICE
628                              "No Valid pid - Either things are really messed up,"
629                              " or you are in the kernel\n");
630                 }
631         } else {
632                 printk(KERN_NOTICE "Kernel or interrupt exception\n");
633         }
634
635         if (retaddr >= (void *)FIXED_CODE_START  && retaddr < (void *)physical_mem_end
636 #if L1_CODE_LENGTH != 0
637             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
638                memcpy.  */
639             && !(retaddr >= (void *)L1_CODE_START
640                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
641 #endif
642         ) {
643                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
644                 unsigned short x = 0;
645                 printk(KERN_NOTICE "return address: [0x%p]; contents of:", retaddr);
646                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
647                         if (!(i & 0xF))
648                                 printk("\n" KERN_NOTICE "0x%08x: ", i);
649
650                         if (get_user(x, (unsigned short *)i))
651                                 break;
652 #ifndef CONFIG_DEBUG_HWERR
653                         /* If one of the last few instructions was a STI
654                          * it is likely that the error occured awhile ago
655                          * and we just noticed. This only happens in kernel
656                          * context, which should mean an oops is happening
657                          */
658                         if (oops_in_progress && x >= 0x0040 && x <= 0x0047 && i <= 0)
659                                 panic("\n\nWARNING : You should reconfigure"
660                                         " the kernel to turn on\n"
661                                         " 'Hardware error interrupt"
662                                         " debugging'\n"
663                                         " The rest of this error"
664                                         " is meanless\n");
665 #endif
666                         if (i == (unsigned int)retaddr)
667                                 printk("[%04x]", x);
668                         else
669                                 printk(" %04x ", x);
670                 }
671                 printk("\n");
672         } else
673                 printk("\n" KERN_NOTICE
674                         "Cannot look at the [PC] for it is"
675                         " in unreadable memory - sorry\n");
676
677         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
678         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
679                 (long)fp->seqstat, fp->ipend, fp->syscfg);
680
681         decode_address(buf, fp->rete);
682         printk(KERN_NOTICE " RETE: %s\n", buf);
683         decode_address(buf, fp->retn);
684         printk(KERN_NOTICE " RETN: %s\n", buf);
685         decode_address(buf, fp->retx);
686         printk(KERN_NOTICE " RETX: %s\n", buf);
687         decode_address(buf, fp->rets);
688         printk(KERN_NOTICE " RETS: %s\n", buf);
689
690         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
691                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
692                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
693                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
694                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
695         }
696
697         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
698         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
699                 fp->r0, fp->r1, fp->r2, fp->r3);
700         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
701                 fp->r4, fp->r5, fp->r6, fp->r7);
702         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
703                 fp->p0, fp->p1, fp->p2, fp->p3);
704         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
705                 fp->p4, fp->p5, fp->fp, (long)fp);
706         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
707                 fp->lb0, fp->lt0, fp->lc0);
708         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
709                 fp->lb1, fp->lt1, fp->lc1);
710         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
711                 fp->b0, fp->l0, fp->m0, fp->i0);
712         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
713                 fp->b1, fp->l1, fp->m1, fp->i1);
714         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
715                 fp->b2, fp->l2, fp->m2, fp->i2);
716         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
717                 fp->b3, fp->l3, fp->m3, fp->i3);
718         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
719                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
720
721         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
722                 rdusp(), fp->astat);
723
724         printk(KERN_NOTICE "\n");
725 }
726
727 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
728 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
729 #endif
730
731 asmlinkage int sys_bfin_spinlock(int *spinlock)
732 {
733         int ret = 0;
734         int tmp = 0;
735
736         local_irq_disable();
737         ret = get_user(tmp, spinlock);
738         if (ret == 0) {
739                 if (tmp)
740                         ret = 1;
741                 tmp = 1;
742                 put_user(tmp, spinlock);
743         }
744         local_irq_enable();
745         return ret;
746 }
747
748 int bfin_request_exception(unsigned int exception, void (*handler)(void))
749 {
750         void (*curr_handler)(void);
751
752         if (exception > 0x3F)
753                 return -EINVAL;
754
755         curr_handler = ex_table[exception];
756
757         if (curr_handler != ex_replaceable)
758                 return -EBUSY;
759
760         ex_table[exception] = handler;
761
762         return 0;
763 }
764 EXPORT_SYMBOL(bfin_request_exception);
765
766 int bfin_free_exception(unsigned int exception, void (*handler)(void))
767 {
768         void (*curr_handler)(void);
769
770         if (exception > 0x3F)
771                 return -EINVAL;
772
773         curr_handler = ex_table[exception];
774
775         if (curr_handler != handler)
776                 return -EBUSY;
777
778         ex_table[exception] = ex_replaceable;
779
780         return 0;
781 }
782 EXPORT_SYMBOL(bfin_free_exception);
783
784 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
785 {
786         switch (cplb_panic) {
787         case CPLB_NO_UNLOCKED:
788                 printk(KERN_EMERG "All CPLBs are locked\n");
789                 break;
790         case CPLB_PROT_VIOL:
791                 return;
792         case CPLB_NO_ADDR_MATCH:
793                 return;
794         case CPLB_UNKNOWN_ERR:
795                 printk(KERN_EMERG "Unknown CPLB Exception\n");
796                 break;
797         }
798
799         oops_in_progress = 1;
800
801         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
802         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
803         dump_bfin_regs(fp, (void *)fp->retx);
804         dump_stack();
805         panic("Unrecoverable event\n");
806 }