[Blackfin] arch: fix bug - trap_tests fails to recover on some tests.
[linux-2.6.git] / 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> /* unknown address */", (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_process(fp);
173         dump_bfin_mem((void *)fp->retx);
174         show_regs(fp);
175         panic("Double Fault - unrecoverable event\n");
176
177 }
178
179 asmlinkage void trap_c(struct pt_regs *fp)
180 {
181 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
182         int j;
183 #endif
184         int sig = 0;
185         siginfo_t info;
186         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
187
188         trace_buffer_save(j);
189
190         /* Important - be very careful dereferncing pointers - will lead to
191          * double faults if the stack has become corrupt
192          */
193
194         /* If the fault was caused by a kernel thread, or interrupt handler
195          * we will kernel panic, so the system reboots.
196          * If KGDB is enabled, don't set this for kernel breakpoints
197         */
198         if ((bfin_read_IPEND() & 0xFFC0)
199 #ifdef CONFIG_KGDB
200                 && trapnr != VEC_EXCPT02
201 #endif
202         ){
203                 console_verbose();
204                 oops_in_progress = 1;
205         } else if (current) {
206                 if (current->mm == NULL) {
207                         console_verbose();
208                         oops_in_progress = 1;
209                 }
210         }
211
212         /* trap_c() will be called for exceptions. During exceptions
213          * processing, the pc value should be set with retx value.
214          * With this change we can cleanup some code in signal.c- TODO
215          */
216         fp->orig_pc = fp->retx;
217         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
218                 trapnr, fp->ipend, fp->pc, fp->retx); */
219
220         /* send the appropriate signal to the user program */
221         switch (trapnr) {
222
223         /* This table works in conjuction with the one in ./mach-common/entry.S
224          * Some exceptions are handled there (in assembly, in exception space)
225          * Some are handled here, (in C, in interrupt space)
226          * Some, like CPLB, are handled in both, where the normal path is
227          * handled in assembly/exception space, and the error path is handled
228          * here
229          */
230
231         /* 0x00 - Linux Syscall, getting here is an error */
232         /* 0x01 - userspace gdb breakpoint, handled here */
233         case VEC_EXCPT01:
234                 info.si_code = TRAP_ILLTRAP;
235                 sig = SIGTRAP;
236                 CHK_DEBUGGER_TRAP_MAYBE();
237                 /* Check if this is a breakpoint in kernel space */
238                 if (fp->ipend & 0xffc0)
239                         return;
240                 else
241                         break;
242 #ifdef CONFIG_KGDB
243         case VEC_EXCPT02 :               /* gdb connection */
244                 info.si_code = TRAP_ILLTRAP;
245                 sig = SIGTRAP;
246                 CHK_DEBUGGER_TRAP();
247                 return;
248 #else
249         /* 0x02 - User Defined, Caught by default */
250 #endif
251         /* 0x03 - User Defined, userspace stack overflow */
252         case VEC_EXCPT03:
253                 info.si_code = SEGV_STACKFLOW;
254                 sig = SIGSEGV;
255                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
256                 CHK_DEBUGGER_TRAP();
257                 break;
258         /* 0x04 - User Defined, Caught by default */
259         /* 0x05 - User Defined, Caught by default */
260         /* 0x06 - User Defined, Caught by default */
261         /* 0x07 - User Defined, Caught by default */
262         /* 0x08 - User Defined, Caught by default */
263         /* 0x09 - User Defined, Caught by default */
264         /* 0x0A - User Defined, Caught by default */
265         /* 0x0B - User Defined, Caught by default */
266         /* 0x0C - User Defined, Caught by default */
267         /* 0x0D - User Defined, Caught by default */
268         /* 0x0E - User Defined, Caught by default */
269         /* 0x0F - User Defined, Caught by default */
270         /* 0x10 HW Single step, handled here */
271         case VEC_STEP:
272                 info.si_code = TRAP_STEP;
273                 sig = SIGTRAP;
274                 CHK_DEBUGGER_TRAP_MAYBE();
275                 /* Check if this is a single step in kernel space */
276                 if (fp->ipend & 0xffc0)
277                         return;
278                 else
279                         break;
280         /* 0x11 - Trace Buffer Full, handled here */
281         case VEC_OVFLOW:
282                 info.si_code = TRAP_TRACEFLOW;
283                 sig = SIGTRAP;
284                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
285                 CHK_DEBUGGER_TRAP();
286                 break;
287         /* 0x12 - Reserved, Caught by default */
288         /* 0x13 - Reserved, Caught by default */
289         /* 0x14 - Reserved, Caught by default */
290         /* 0x15 - Reserved, Caught by default */
291         /* 0x16 - Reserved, Caught by default */
292         /* 0x17 - Reserved, Caught by default */
293         /* 0x18 - Reserved, Caught by default */
294         /* 0x19 - Reserved, Caught by default */
295         /* 0x1A - Reserved, Caught by default */
296         /* 0x1B - Reserved, Caught by default */
297         /* 0x1C - Reserved, Caught by default */
298         /* 0x1D - Reserved, Caught by default */
299         /* 0x1E - Reserved, Caught by default */
300         /* 0x1F - Reserved, Caught by default */
301         /* 0x20 - Reserved, Caught by default */
302         /* 0x21 - Undefined Instruction, handled here */
303         case VEC_UNDEF_I:
304                 info.si_code = ILL_ILLOPC;
305                 sig = SIGILL;
306                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
307                 CHK_DEBUGGER_TRAP();
308                 break;
309         /* 0x22 - Illegal Instruction Combination, handled here */
310         case VEC_ILGAL_I:
311                 info.si_code = ILL_ILLPARAOP;
312                 sig = SIGILL;
313                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
314                 CHK_DEBUGGER_TRAP();
315                 break;
316         /* 0x23 - Data CPLB protection violation, handled here */
317         case VEC_CPLB_VL:
318                 info.si_code = ILL_CPLB_VI;
319                 sig = SIGBUS;
320                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
321                 CHK_DEBUGGER_TRAP();
322                 break;
323         /* 0x24 - Data access misaligned, handled here */
324         case VEC_MISALI_D:
325                 info.si_code = BUS_ADRALN;
326                 sig = SIGBUS;
327                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
328                 CHK_DEBUGGER_TRAP();
329                 break;
330         /* 0x25 - Unrecoverable Event, handled here */
331         case VEC_UNCOV:
332                 info.si_code = ILL_ILLEXCPT;
333                 sig = SIGILL;
334                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
335                 CHK_DEBUGGER_TRAP();
336                 break;
337         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
338                 error case is handled here */
339         case VEC_CPLB_M:
340                 info.si_code = BUS_ADRALN;
341                 sig = SIGBUS;
342                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
343                 CHK_DEBUGGER_TRAP();
344                 break;
345         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
346         case VEC_CPLB_MHIT:
347                 info.si_code = ILL_CPLB_MULHIT;
348 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
349                 sig = SIGSEGV;
350                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
351 #else
352                 sig = SIGILL;
353                 printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
354 #endif
355                 CHK_DEBUGGER_TRAP();
356                 break;
357         /* 0x28 - Emulation Watchpoint, handled here */
358         case VEC_WATCH:
359                 info.si_code = TRAP_WATCHPT;
360                 sig = SIGTRAP;
361                 pr_debug(EXC_0x28(KERN_DEBUG));
362                 CHK_DEBUGGER_TRAP_MAYBE();
363                 /* Check if this is a watchpoint in kernel space */
364                 if (fp->ipend & 0xffc0)
365                         return;
366                 else
367                         break;
368 #ifdef CONFIG_BF535
369         /* 0x29 - Instruction fetch access error (535 only) */
370         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
371                 info.si_code = BUS_OPFETCH;
372                 sig = SIGBUS;
373                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
374                 CHK_DEBUGGER_TRAP();
375                 break;
376 #else
377         /* 0x29 - Reserved, Caught by default */
378 #endif
379         /* 0x2A - Instruction fetch misaligned, handled here */
380         case VEC_MISALI_I:
381                 info.si_code = BUS_ADRALN;
382                 sig = SIGBUS;
383                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
384                 CHK_DEBUGGER_TRAP();
385                 break;
386         /* 0x2B - Instruction CPLB protection violation, handled here */
387         case VEC_CPLB_I_VL:
388                 info.si_code = ILL_CPLB_VI;
389                 sig = SIGBUS;
390                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
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(KERN_NOTICE));
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(KERN_NOTICE));
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(KERN_NOTICE));
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         case VEC_HWERR:
437                 info.si_code = BUS_ADRALN;
438                 sig = SIGBUS;
439                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
440                 /* System MMR Error */
441                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
442                         info.si_code = BUS_ADRALN;
443                         sig = SIGBUS;
444                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
445                         break;
446                 /* External Memory Addressing Error */
447                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
448                         info.si_code = BUS_ADRERR;
449                         sig = SIGBUS;
450                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
451                         break;
452                 /* Performance Monitor Overflow */
453                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
454                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
455                         break;
456                 /* RAISE 5 instruction */
457                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
458                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
459                         break;
460                 default:        /* Reserved */
461                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
462                         break;
463                 }
464                 CHK_DEBUGGER_TRAP();
465                 break;
466         default:
467                 info.si_code = TRAP_ILLTRAP;
468                 sig = SIGTRAP;
469                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
470                         (fp->seqstat & SEQSTAT_EXCAUSE));
471                 CHK_DEBUGGER_TRAP();
472                 break;
473         }
474
475         BUG_ON(sig == 0);
476
477         if (sig != SIGTRAP) {
478                 unsigned long stack;
479                 dump_bfin_process(fp);
480                 /* Is it an interrupt, or an exception? */
481                 if (trapnr == VEC_HWERR)
482                         dump_bfin_mem((void *)fp->pc);
483                 else
484                         dump_bfin_mem((void *)fp->retx);
485                 show_regs(fp);
486
487                 /* Print out the trace buffer if it makes sense */
488 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
489                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
490                         printk(KERN_NOTICE "No trace since you do not have "
491                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
492                                 KERN_NOTICE "\n");
493                 else
494 #endif
495                         dump_bfin_trace_buffer();
496                 show_stack(current, &stack);
497                 if (oops_in_progress) {
498 #ifndef CONFIG_ACCESS_CHECK
499                         printk(KERN_EMERG "Please turn on "
500                                "CONFIG_ACCESS_CHECK\n");
501 #endif
502                         panic("Kernel exception");
503                 }
504         }
505
506         info.si_signo = sig;
507         info.si_errno = 0;
508         info.si_addr = (void *)fp->pc;
509         force_sig_info(sig, &info, current);
510
511         /* Ensure that bad return addresses don't end up in an infinite
512          * loop, due to speculative loads/reads. This needs to be done after
513          * the signal has been sent.
514          */
515         if (trapnr == VEC_CPLB_I_M && sig != SIGTRAP)
516                 fp->pc = SAFE_USER_INSTRUCTION;
517
518         trace_buffer_restore(j);
519         return;
520 }
521
522 /* Typical exception handling routines  */
523
524 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
525
526 void dump_bfin_trace_buffer(void)
527 {
528 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
529         int tflags, i = 0;
530         char buf[150];
531 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
532         int j, index;
533 #endif
534
535         trace_buffer_save(tflags);
536
537         printk(KERN_NOTICE "Hardware Trace:\n");
538
539         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
540                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
541                         decode_address(buf, (unsigned long)bfin_read_TBUF());
542                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
543                         decode_address(buf, (unsigned long)bfin_read_TBUF());
544                         printk(KERN_NOTICE "     Source : %s\n", buf);
545                 }
546         }
547
548 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
549         if (trace_buff_offset)
550                 index = trace_buff_offset/4 - 1;
551         else
552                 index = EXPAND_LEN;
553
554         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
555         while (j) {
556                 decode_address(buf, software_trace_buff[index]);
557                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
558                 index -= 1;
559                 if (index < 0 )
560                         index = EXPAND_LEN;
561                 decode_address(buf, software_trace_buff[index]);
562                 printk(KERN_NOTICE "     Source : %s\n", buf);
563                 index -= 1;
564                 if (index < 0)
565                         index = EXPAND_LEN;
566                 j--;
567                 i++;
568         }
569 #endif
570
571         trace_buffer_restore(tflags);
572 #endif
573 }
574 EXPORT_SYMBOL(dump_bfin_trace_buffer);
575
576 static void show_trace(struct task_struct *tsk, unsigned long *sp)
577 {
578         unsigned long addr;
579
580         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
581
582         while (!kstack_end(sp)) {
583                 addr = *sp++;
584                 /*
585                  * If the address is either in the text segment of the
586                  * kernel, or in the region which contains vmalloc'ed
587                  * memory, it *may* be the address of a calling
588                  * routine; if so, print it so that someone tracing
589                  * down the cause of the crash will be able to figure
590                  * out the call path that was taken.
591                  */
592                 if (kernel_text_address(addr))
593                         print_ip_sym(addr);
594         }
595
596         printk(KERN_NOTICE "\n");
597 }
598
599 void show_stack(struct task_struct *task, unsigned long *stack)
600 {
601         unsigned long *endstack, addr;
602         int i;
603
604         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
605          * called externally in some places in the kernel.
606          */
607
608         if (!stack) {
609                 if (task)
610                         stack = (unsigned long *)task->thread.ksp;
611                 else
612                         stack = (unsigned long *)&stack;
613         }
614
615         addr = (unsigned long)stack;
616         endstack = (unsigned long *)PAGE_ALIGN(addr);
617
618         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
619         for (i = 0; i < kstack_depth_to_print; i++) {
620                 if (stack + 1 > endstack)
621                         break;
622                 if (i % 8 == 0)
623                         printk("\n" KERN_NOTICE "       ");
624                 printk(" %08lx", *stack++);
625         }
626         printk("\n");
627
628         show_trace(task, stack);
629 }
630
631 void dump_stack(void)
632 {
633         unsigned long stack;
634 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
635         int tflags;
636 #endif
637         trace_buffer_save(tflags);
638         dump_bfin_trace_buffer();
639         show_stack(current, &stack);
640         trace_buffer_restore(tflags);
641 }
642 EXPORT_SYMBOL(dump_stack);
643
644 void dump_bfin_process(struct pt_regs *fp)
645 {
646         /* We should be able to look at fp->ipend, but we don't push it on the
647          * stack all the time, so do this until we fix that */
648         unsigned int context = bfin_read_IPEND();
649
650         if (oops_in_progress)
651                 printk(KERN_EMERG "Kernel OOPS in progress\n");
652
653         if (context & 0x0020)
654                 printk(KERN_NOTICE "Deferred excecption or HW Error context\n");
655         else if (context & 0x3FC0)
656                 printk(KERN_NOTICE "Interrupt context\n");
657         else if (context & 0x4000)
658                 printk(KERN_NOTICE "Deferred Interrupt context\n");
659         else if (context & 0x8000)
660                 printk(KERN_NOTICE "Kernel process context\n");
661
662         if (current->pid && current->mm) {
663                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
664                 printk(KERN_NOTICE "COMM=%s PID=%d\n",
665                         current->comm, current->pid);
666
667                 printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
668                         KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
669                         KERN_NOTICE "\n",
670                         (void *)current->mm->start_code,
671                         (void *)current->mm->end_code,
672                         (void *)current->mm->start_data,
673                         (void *)current->mm->end_data,
674                         (void *)current->mm->end_data,
675                         (void *)current->mm->brk,
676                         (void *)current->mm->start_stack);
677         } else
678                 printk(KERN_NOTICE "\n" KERN_NOTICE
679                      "No Valid process in current context\n");
680 }
681
682 void dump_bfin_mem(void *retaddr)
683 {
684
685         if (retaddr >= (void *)FIXED_CODE_START  && retaddr < (void *)physical_mem_end
686 #if L1_CODE_LENGTH != 0
687             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
688                memcpy.  */
689             && !(retaddr >= (void *)L1_CODE_START
690                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
691 #endif
692         ) {
693                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
694                 unsigned short x = 0;
695                 printk(KERN_NOTICE "return address: [0x%p]; contents of:", retaddr);
696                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
697                         if (!(i & 0xF))
698                                 printk("\n" KERN_NOTICE "0x%08x: ", i);
699
700                         if (get_user(x, (unsigned short *)i))
701                                 break;
702 #ifndef CONFIG_DEBUG_HWERR
703                         /* If one of the last few instructions was a STI
704                          * it is likely that the error occured awhile ago
705                          * and we just noticed. This only happens in kernel
706                          * context, which should mean an oops is happening
707                          */
708                         if (oops_in_progress && x >= 0x0040 && x <= 0x0047 && i <= 0)
709                                 printk(KERN_EMERG "\n"
710                                         KERN_EMERG "WARNING : You should reconfigure"
711                                         " the kernel to turn on\n"
712                                         KERN_EMERG " 'Hardware error interrupt debugging'\n"
713                                         KERN_EMERG " The rest of this error is meanless\n");
714 #endif
715                         if (i == (unsigned int)retaddr)
716                                 printk("[%04x]", x);
717                         else
718                                 printk(" %04x ", x);
719                 }
720                 printk("\n");
721         } else
722                 printk("\n" KERN_NOTICE
723                         "Cannot look at the [PC] <%p> for it is"
724                         " in unreadable memory - sorry\n", retaddr);
725 }
726
727 void show_regs(struct pt_regs *fp)
728 {
729         char buf [150];
730
731         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
732         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
733                 (long)fp->seqstat, fp->ipend, fp->syscfg);
734         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
735                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
736         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
737                 fp->seqstat & SEQSTAT_EXCAUSE);
738
739         decode_address(buf, fp->rete);
740         printk(KERN_NOTICE " RETE: %s\n", buf);
741         decode_address(buf, fp->retn);
742         printk(KERN_NOTICE " RETN: %s\n", buf);
743         decode_address(buf, fp->retx);
744         printk(KERN_NOTICE " RETX: %s\n", buf);
745         decode_address(buf, fp->rets);
746         printk(KERN_NOTICE " RETS: %s\n", buf);
747         decode_address(buf, fp->pc);
748         printk(KERN_NOTICE " PC  : %s\n", buf);
749
750         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
751             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
752                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
753                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
754                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
755                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
756         }
757
758         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
759         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
760                 fp->r0, fp->r1, fp->r2, fp->r3);
761         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
762                 fp->r4, fp->r5, fp->r6, fp->r7);
763         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
764                 fp->p0, fp->p1, fp->p2, fp->p3);
765         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
766                 fp->p4, fp->p5, fp->fp, (long)fp);
767         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
768                 fp->lb0, fp->lt0, fp->lc0);
769         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
770                 fp->lb1, fp->lt1, fp->lc1);
771         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
772                 fp->b0, fp->l0, fp->m0, fp->i0);
773         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
774                 fp->b1, fp->l1, fp->m1, fp->i1);
775         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
776                 fp->b2, fp->l2, fp->m2, fp->i2);
777         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
778                 fp->b3, fp->l3, fp->m3, fp->i3);
779         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
780                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
781
782         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
783                 rdusp(), fp->astat);
784
785         printk(KERN_NOTICE "\n");
786 }
787
788 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
789 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
790 #endif
791
792 asmlinkage int sys_bfin_spinlock(int *spinlock)
793 {
794         int ret = 0;
795         int tmp = 0;
796
797         local_irq_disable();
798         ret = get_user(tmp, spinlock);
799         if (ret == 0) {
800                 if (tmp)
801                         ret = 1;
802                 tmp = 1;
803                 put_user(tmp, spinlock);
804         }
805         local_irq_enable();
806         return ret;
807 }
808
809 int bfin_request_exception(unsigned int exception, void (*handler)(void))
810 {
811         void (*curr_handler)(void);
812
813         if (exception > 0x3F)
814                 return -EINVAL;
815
816         curr_handler = ex_table[exception];
817
818         if (curr_handler != ex_replaceable)
819                 return -EBUSY;
820
821         ex_table[exception] = handler;
822
823         return 0;
824 }
825 EXPORT_SYMBOL(bfin_request_exception);
826
827 int bfin_free_exception(unsigned int exception, void (*handler)(void))
828 {
829         void (*curr_handler)(void);
830
831         if (exception > 0x3F)
832                 return -EINVAL;
833
834         curr_handler = ex_table[exception];
835
836         if (curr_handler != handler)
837                 return -EBUSY;
838
839         ex_table[exception] = ex_replaceable;
840
841         return 0;
842 }
843 EXPORT_SYMBOL(bfin_free_exception);
844
845 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
846 {
847         switch (cplb_panic) {
848         case CPLB_NO_UNLOCKED:
849                 printk(KERN_EMERG "All CPLBs are locked\n");
850                 break;
851         case CPLB_PROT_VIOL:
852                 return;
853         case CPLB_NO_ADDR_MATCH:
854                 return;
855         case CPLB_UNKNOWN_ERR:
856                 printk(KERN_EMERG "Unknown CPLB Exception\n");
857                 break;
858         }
859
860         oops_in_progress = 1;
861
862         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
863         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
864         dump_bfin_process(fp);
865         dump_bfin_mem((void *)fp->retx);
866         show_regs(fp);
867         dump_stack();
868         panic("Unrecoverable event\n");
869 }