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Blackfin arch: ensure we work around ANOMALY_05000261 for null pointers
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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, handled here */
315         case VEC_CPLB_VL:
316                 info.si_code = ILL_CPLB_VI;
317                 sig = SIGBUS;
318                 printk(KERN_NOTICE EXC_0x23);
319                 CHK_DEBUGGER_TRAP();
320                 break;
321         /* 0x24 - Data access misaligned, handled here */
322         case VEC_MISALI_D:
323                 info.si_code = BUS_ADRALN;
324                 sig = SIGBUS;
325                 printk(KERN_NOTICE EXC_0x24);
326                 CHK_DEBUGGER_TRAP();
327                 break;
328         /* 0x25 - Unrecoverable Event, handled here */
329         case VEC_UNCOV:
330                 info.si_code = ILL_ILLEXCPT;
331                 sig = SIGILL;
332                 printk(KERN_NOTICE EXC_0x25);
333                 CHK_DEBUGGER_TRAP();
334                 break;
335         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
336                 error case is handled here */
337         case VEC_CPLB_M:
338                 info.si_code = BUS_ADRALN;
339                 sig = SIGBUS;
340                 printk(KERN_NOTICE EXC_0x26);
341                 CHK_DEBUGGER_TRAP();
342                 break;
343         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
344         case VEC_CPLB_MHIT:
345                 info.si_code = ILL_CPLB_MULHIT;
346 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
347                 sig = SIGSEGV;
348                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
349 #else
350                 sig = SIGILL;
351                 printk(KERN_NOTICE EXC_0x27);
352 #endif
353                 CHK_DEBUGGER_TRAP();
354                 break;
355         /* 0x28 - Emulation Watchpoint, handled here */
356         case VEC_WATCH:
357                 info.si_code = TRAP_WATCHPT;
358                 sig = SIGTRAP;
359                 pr_debug(EXC_0x28);
360                 CHK_DEBUGGER_TRAP_MAYBE();
361                 /* Check if this is a watchpoint in kernel space */
362                 if (fp->ipend & 0xffc0)
363                         return;
364                 else
365                         break;
366 #ifdef CONFIG_BF535
367         /* 0x29 - Instruction fetch access error (535 only) */
368         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
369                 info.si_code = BUS_OPFETCH;
370                 sig = SIGBUS;
371                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
372                 CHK_DEBUGGER_TRAP();
373                 break;
374 #else
375         /* 0x29 - Reserved, Caught by default */
376 #endif
377         /* 0x2A - Instruction fetch misaligned, handled here */
378         case VEC_MISALI_I:
379                 info.si_code = BUS_ADRALN;
380                 sig = SIGBUS;
381                 printk(KERN_NOTICE EXC_0x2A);
382                 CHK_DEBUGGER_TRAP();
383                 break;
384         /* 0x2B - Instruction CPLB protection violation, handled here */
385         case VEC_CPLB_I_VL:
386                 info.si_code = ILL_CPLB_VI;
387                 sig = SIGBUS;
388                 printk(KERN_NOTICE EXC_0x2B);
389                 CHK_DEBUGGER_TRAP();
390                 break;
391         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
392         case VEC_CPLB_I_M:
393                 info.si_code = ILL_CPLB_MISS;
394                 sig = SIGBUS;
395                 printk(KERN_NOTICE EXC_0x2C);
396                 CHK_DEBUGGER_TRAP();
397                 break;
398         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
399         case VEC_CPLB_I_MHIT:
400                 info.si_code = ILL_CPLB_MULHIT;
401 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
402                 sig = SIGSEGV;
403                 printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
404 #else
405                 sig = SIGILL;
406                 printk(KERN_NOTICE EXC_0x2D);
407 #endif
408                 CHK_DEBUGGER_TRAP();
409                 break;
410         /* 0x2E - Illegal use of Supervisor Resource, handled here */
411         case VEC_ILL_RES:
412                 info.si_code = ILL_PRVOPC;
413                 sig = SIGILL;
414                 printk(KERN_NOTICE EXC_0x2E);
415                 CHK_DEBUGGER_TRAP();
416                 break;
417         /* 0x2F - Reserved, Caught by default */
418         /* 0x30 - Reserved, Caught by default */
419         /* 0x31 - Reserved, Caught by default */
420         /* 0x32 - Reserved, Caught by default */
421         /* 0x33 - Reserved, Caught by default */
422         /* 0x34 - Reserved, Caught by default */
423         /* 0x35 - Reserved, Caught by default */
424         /* 0x36 - Reserved, Caught by default */
425         /* 0x37 - Reserved, Caught by default */
426         /* 0x38 - Reserved, Caught by default */
427         /* 0x39 - Reserved, Caught by default */
428         /* 0x3A - Reserved, Caught by default */
429         /* 0x3B - Reserved, Caught by default */
430         /* 0x3C - Reserved, Caught by default */
431         /* 0x3D - Reserved, Caught by default */
432         /* 0x3E - Reserved, Caught by default */
433         /* 0x3F - Reserved, Caught by default */
434         default:
435                 info.si_code = TRAP_ILLTRAP;
436                 sig = SIGTRAP;
437                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
438                         (fp->seqstat & SEQSTAT_EXCAUSE));
439                 CHK_DEBUGGER_TRAP();
440                 break;
441         }
442
443         BUG_ON(sig == 0);
444
445         if (sig != SIGTRAP) {
446                 unsigned long stack;
447                 dump_bfin_regs(fp, (void *)fp->retx);
448
449                 /* Print out the trace buffer if it makes sense */
450 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
451                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
452                         printk(KERN_NOTICE "No trace since you do not have "
453                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
454                                 KERN_NOTICE "\n");
455                 else
456 #endif
457                         dump_bfin_trace_buffer();
458                 show_stack(current, &stack);
459                 if (oops_in_progress) {
460 #ifndef CONFIG_ACCESS_CHECK
461                         printk(KERN_EMERG "Hey - dork - please turn on "
462                                 "CONFIG_ACCESS_CHECK\n");
463 #endif
464                         panic("Kernel exception");
465                 }
466
467                 /* Ensure that bad return addresses don't end up in an infinite
468                  * loop, due to speculative loads/reads
469                  */
470                 fp->pc = SAFE_USER_INSTRUCTION;
471         }
472         info.si_signo = sig;
473         info.si_errno = 0;
474         info.si_addr = (void *)fp->pc;
475         force_sig_info(sig, &info, current);
476
477         trace_buffer_restore(j);
478         return;
479 }
480
481 /* Typical exception handling routines  */
482
483 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
484
485 void dump_bfin_trace_buffer(void)
486 {
487 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
488         int tflags, i = 0;
489         char buf[150];
490 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
491         int j, index;
492 #endif
493
494         trace_buffer_save(tflags);
495
496         printk(KERN_NOTICE "Hardware Trace:\n");
497
498         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
499                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
500                         decode_address(buf, (unsigned long)bfin_read_TBUF());
501                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
502                         decode_address(buf, (unsigned long)bfin_read_TBUF());
503                         printk(KERN_NOTICE "     Source : %s\n", buf);
504                 }
505         }
506
507 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
508         if (trace_buff_offset)
509                 index = trace_buff_offset/4 - 1;
510         else
511                 index = EXPAND_LEN;
512
513         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
514         while (j) {
515                 decode_address(buf, software_trace_buff[index]);
516                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
517                 index -= 1;
518                 if (index < 0 )
519                         index = EXPAND_LEN;
520                 decode_address(buf, software_trace_buff[index]);
521                 printk(KERN_NOTICE "     Source : %s\n", buf);
522                 index -= 1;
523                 if (index < 0)
524                         index = EXPAND_LEN;
525                 j--;
526                 i++;
527         }
528 #endif
529
530         trace_buffer_restore(tflags);
531 #endif
532 }
533 EXPORT_SYMBOL(dump_bfin_trace_buffer);
534
535 static void show_trace(struct task_struct *tsk, unsigned long *sp)
536 {
537         unsigned long addr;
538
539         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
540
541         while (!kstack_end(sp)) {
542                 addr = *sp++;
543                 /*
544                  * If the address is either in the text segment of the
545                  * kernel, or in the region which contains vmalloc'ed
546                  * memory, it *may* be the address of a calling
547                  * routine; if so, print it so that someone tracing
548                  * down the cause of the crash will be able to figure
549                  * out the call path that was taken.
550                  */
551                 if (kernel_text_address(addr))
552                         print_ip_sym(addr);
553         }
554
555         printk(KERN_NOTICE "\n");
556 }
557
558 void show_stack(struct task_struct *task, unsigned long *stack)
559 {
560         unsigned long *endstack, addr;
561         int i;
562
563         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
564          * called externally in some places in the kernel.
565          */
566
567         if (!stack) {
568                 if (task)
569                         stack = (unsigned long *)task->thread.ksp;
570                 else
571                         stack = (unsigned long *)&stack;
572         }
573
574         addr = (unsigned long)stack;
575         endstack = (unsigned long *)PAGE_ALIGN(addr);
576
577         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
578         for (i = 0; i < kstack_depth_to_print; i++) {
579                 if (stack + 1 > endstack)
580                         break;
581                 if (i % 8 == 0)
582                         printk("\n" KERN_NOTICE "       ");
583                 printk(" %08lx", *stack++);
584         }
585         printk("\n");
586
587         show_trace(task, stack);
588 }
589
590 void dump_stack(void)
591 {
592         unsigned long stack;
593 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
594         int tflags;
595 #endif
596         trace_buffer_save(tflags);
597         dump_bfin_trace_buffer();
598         show_stack(current, &stack);
599         trace_buffer_restore(tflags);
600 }
601
602 EXPORT_SYMBOL(dump_stack);
603
604 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
605 {
606         char buf [150];
607
608         if (!oops_in_progress) {
609                 if (current->pid && current->mm) {
610                         printk(KERN_NOTICE "\n" KERN_NOTICE "CURRENT PROCESS:\n");
611                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
612                                 current->comm, current->pid);
613
614                         printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
615                                 KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
616                                 KERN_NOTICE "\n",
617                                 (void *)current->mm->start_code,
618                                 (void *)current->mm->end_code,
619                                 (void *)current->mm->start_data,
620                                 (void *)current->mm->end_data,
621                                 (void *)current->mm->end_data,
622                                 (void *)current->mm->brk,
623                                 (void *)current->mm->start_stack);
624                 } else {
625                         printk (KERN_NOTICE "\n" KERN_NOTICE
626                              "No Valid pid - Either things are really messed up,"
627                              " or you are in the kernel\n");
628                 }
629         } else {
630                 printk(KERN_NOTICE "Kernel or interrupt exception\n");
631         }
632
633         if (retaddr >= (void *)FIXED_CODE_START  && retaddr < (void *)physical_mem_end
634 #if L1_CODE_LENGTH != 0
635             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
636                memcpy.  */
637             && !(retaddr >= (void *)L1_CODE_START
638                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
639 #endif
640         ) {
641                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
642                 unsigned short x = 0;
643                 printk(KERN_NOTICE "return address: [0x%p]; contents of:", retaddr);
644                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
645                         if (!(i & 0xF))
646                                 printk("\n" KERN_NOTICE "0x%08x: ", i);
647
648                         if (get_user(x, (unsigned short *)i))
649                                 break;
650 #ifndef CONFIG_DEBUG_HWERR
651                         /* If one of the last few instructions was a STI
652                          * it is likely that the error occured awhile ago
653                          * and we just noticed. This only happens in kernel
654                          * context, which should mean an oops is happening
655                          */
656                         if (oops_in_progress && x >= 0x0040 && x <= 0x0047 && i <= 0)
657                                 panic("\n\nWARNING : You should reconfigure"
658                                         " the kernel to turn on\n"
659                                         " 'Hardware error interrupt"
660                                         " debugging'\n"
661                                         " The rest of this error"
662                                         " is meanless\n");
663 #endif
664                         if (i == (unsigned int)retaddr)
665                                 printk("[%04x]", x);
666                         else
667                                 printk(" %04x ", x);
668                 }
669                 printk("\n");
670         } else
671                 printk("\n" KERN_NOTICE
672                         "Cannot look at the [PC] for it is"
673                         " in unreadable memory - sorry\n");
674
675         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
676         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
677                 (long)fp->seqstat, fp->ipend, fp->syscfg);
678
679         decode_address(buf, fp->rete);
680         printk(KERN_NOTICE " RETE: %s\n", buf);
681         decode_address(buf, fp->retn);
682         printk(KERN_NOTICE " RETN: %s\n", buf);
683         decode_address(buf, fp->retx);
684         printk(KERN_NOTICE " RETX: %s\n", buf);
685         decode_address(buf, fp->rets);
686         printk(KERN_NOTICE " RETS: %s\n", buf);
687
688         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
689                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
690                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
691                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
692                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
693         }
694
695         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
696         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
697                 fp->r0, fp->r1, fp->r2, fp->r3);
698         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
699                 fp->r4, fp->r5, fp->r6, fp->r7);
700         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
701                 fp->p0, fp->p1, fp->p2, fp->p3);
702         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
703                 fp->p4, fp->p5, fp->fp, (long)fp);
704         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
705                 fp->lb0, fp->lt0, fp->lc0);
706         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
707                 fp->lb1, fp->lt1, fp->lc1);
708         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
709                 fp->b0, fp->l0, fp->m0, fp->i0);
710         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
711                 fp->b1, fp->l1, fp->m1, fp->i1);
712         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
713                 fp->b2, fp->l2, fp->m2, fp->i2);
714         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
715                 fp->b3, fp->l3, fp->m3, fp->i3);
716         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
717                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
718
719         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
720                 rdusp(), fp->astat);
721
722         printk(KERN_NOTICE "\n");
723 }
724
725 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
726 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
727 #endif
728
729 asmlinkage int sys_bfin_spinlock(int *spinlock)
730 {
731         int ret = 0;
732         int tmp = 0;
733
734         local_irq_disable();
735         ret = get_user(tmp, spinlock);
736         if (ret == 0) {
737                 if (tmp)
738                         ret = 1;
739                 tmp = 1;
740                 put_user(tmp, spinlock);
741         }
742         local_irq_enable();
743         return ret;
744 }
745
746 int bfin_request_exception(unsigned int exception, void (*handler)(void))
747 {
748         void (*curr_handler)(void);
749
750         if (exception > 0x3F)
751                 return -EINVAL;
752
753         curr_handler = ex_table[exception];
754
755         if (curr_handler != ex_replaceable)
756                 return -EBUSY;
757
758         ex_table[exception] = handler;
759
760         return 0;
761 }
762 EXPORT_SYMBOL(bfin_request_exception);
763
764 int bfin_free_exception(unsigned int exception, void (*handler)(void))
765 {
766         void (*curr_handler)(void);
767
768         if (exception > 0x3F)
769                 return -EINVAL;
770
771         curr_handler = ex_table[exception];
772
773         if (curr_handler != handler)
774                 return -EBUSY;
775
776         ex_table[exception] = ex_replaceable;
777
778         return 0;
779 }
780 EXPORT_SYMBOL(bfin_free_exception);
781
782 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
783 {
784         switch (cplb_panic) {
785         case CPLB_NO_UNLOCKED:
786                 printk(KERN_EMERG "All CPLBs are locked\n");
787                 break;
788         case CPLB_PROT_VIOL:
789                 return;
790         case CPLB_NO_ADDR_MATCH:
791                 return;
792         case CPLB_UNKNOWN_ERR:
793                 printk(KERN_EMERG "Unknown CPLB Exception\n");
794                 break;
795         }
796
797         oops_in_progress = 1;
798
799         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
800         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
801         dump_bfin_regs(fp, (void *)fp->retx);
802         dump_stack();
803         panic("Unrecoverable event\n");
804 }