Blackfin arch: only include asm/cplb.h when it is truly used
[linux-2.6] / arch / blackfin / kernel / traps.c
1 /*
2  * File:         arch/blackfin/kernel/traps.c
3  * Based on:
4  * Author:       Hamish Macdonald
5  *
6  * Created:
7  * Description:  uses S/W interrupt 15 for the system calls
8  *
9  * Modified:
10  *               Copyright 2004-2006 Analog Devices Inc.
11  *
12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2 of the License, or
17  * (at your option) any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22  * GNU General Public License for more details.
23  *
24  * You should have received a copy of the GNU General Public License
25  * along with this program; if not, see the file COPYING, or write
26  * to the Free Software Foundation, Inc.,
27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
28  */
29
30 #include <linux/uaccess.h>
31 #include <linux/interrupt.h>
32 #include <linux/module.h>
33 #include <linux/kallsyms.h>
34 #include <linux/fs.h>
35 #include <asm/traps.h>
36 #include <asm/cacheflush.h>
37 #include <asm/cplb.h>
38 #include <asm/blackfin.h>
39 #include <asm/irq_handler.h>
40 #include <linux/irq.h>
41 #include <asm/trace.h>
42 #include <asm/fixed_code.h>
43 #include <asm/dma.h>
44
45 #ifdef CONFIG_KGDB
46 # include <linux/debugger.h>
47 # include <linux/kgdb.h>
48
49 # define CHK_DEBUGGER_TRAP() \
50         do { \
51                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
52         } while (0)
53 # define CHK_DEBUGGER_TRAP_MAYBE() \
54         do { \
55                 if (kgdb_connected) \
56                         CHK_DEBUGGER_TRAP(); \
57         } while (0)
58 #else
59 # define CHK_DEBUGGER_TRAP() do { } while (0)
60 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
61 #endif
62
63 /* Initiate the event table handler */
64 void __init trap_init(void)
65 {
66         CSYNC();
67         bfin_write_EVT3(trap);
68         CSYNC();
69 }
70
71 unsigned long saved_icplb_fault_addr, saved_dcplb_fault_addr;
72
73 static void decode_address(char *buf, unsigned long address)
74 {
75         struct vm_list_struct *vml;
76         struct task_struct *p;
77         struct mm_struct *mm;
78         unsigned long flags, offset;
79         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
80
81 #ifdef CONFIG_KALLSYMS
82         unsigned long symsize;
83         const char *symname;
84         char *modname;
85         char *delim = ":";
86         char namebuf[128];
87
88         /* look up the address and see if we are in kernel space */
89         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
90
91         if (symname) {
92                 /* yeah! kernel space! */
93                 if (!modname)
94                         modname = delim = "";
95                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
96                               (void *)address, delim, modname, delim, symname,
97                               (unsigned long)offset);
98                 return;
99
100         }
101 #endif
102
103         /* Problem in fixed code section? */
104         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
105                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
106                 return;
107         }
108
109         /* Problem somewhere before the kernel start address */
110         if (address < CONFIG_BOOT_LOAD) {
111                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
112                 return;
113         }
114
115         /* looks like we're off in user-land, so let's walk all the
116          * mappings of all our processes and see if we can't be a whee
117          * bit more specific
118          */
119         write_lock_irqsave(&tasklist_lock, flags);
120         for_each_process(p) {
121                 mm = (in_atomic ? p->mm : get_task_mm(p));
122                 if (!mm)
123                         continue;
124
125                 vml = mm->context.vmlist;
126                 while (vml) {
127                         struct vm_area_struct *vma = vml->vma;
128
129                         if (address >= vma->vm_start && address < vma->vm_end) {
130                                 char _tmpbuf[256];
131                                 char *name = p->comm;
132                                 struct file *file = vma->vm_file;
133
134                                 if (file)
135                                         name = d_path(&file->f_path, _tmpbuf,
136                                                       sizeof(_tmpbuf));
137
138                                 /* FLAT does not have its text aligned to the start of
139                                  * the map while FDPIC ELF does ...
140                                  */
141
142                                 /* before we can check flat/fdpic, we need to
143                                  * make sure current is valid
144                                  */
145                                 if ((unsigned long)current >= FIXED_CODE_START &&
146                                     !((unsigned long)current & 0x3)) {
147                                         if (current->mm &&
148                                             (address > current->mm->start_code) &&
149                                             (address < current->mm->end_code))
150                                                 offset = address - current->mm->start_code;
151                                         else
152                                                 offset = (address - vma->vm_start) +
153                                                          (vma->vm_pgoff << PAGE_SHIFT);
154
155                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
156                                                 (void *)address, name, offset);
157                                 } else
158                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
159                                                 (void *)address, name,
160                                                 vma->vm_start, vma->vm_end);
161
162                                 if (!in_atomic)
163                                         mmput(mm);
164
165                                 if (!strlen(buf))
166                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
167
168                                 goto done;
169                         }
170
171                         vml = vml->next;
172                 }
173                 if (!in_atomic)
174                         mmput(mm);
175         }
176
177         /* we were unable to find this address anywhere */
178         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
179
180 done:
181         write_unlock_irqrestore(&tasklist_lock, flags);
182 }
183
184 asmlinkage void double_fault_c(struct pt_regs *fp)
185 {
186         console_verbose();
187         oops_in_progress = 1;
188         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
189         dump_bfin_process(fp);
190         dump_bfin_mem(fp);
191         show_regs(fp);
192         panic("Double Fault - unrecoverable event\n");
193
194 }
195
196 asmlinkage void trap_c(struct pt_regs *fp)
197 {
198 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
199         int j;
200 #endif
201         int sig = 0;
202         siginfo_t info;
203         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
204
205         trace_buffer_save(j);
206
207         /* Important - be very careful dereferncing pointers - will lead to
208          * double faults if the stack has become corrupt
209          */
210
211         /* If the fault was caused by a kernel thread, or interrupt handler
212          * we will kernel panic, so the system reboots.
213          * If KGDB is enabled, don't set this for kernel breakpoints
214         */
215
216         /* TODO: check to see if we are in some sort of deferred HWERR
217          * that we should be able to recover from, not kernel panic
218          */
219         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
220 #ifdef CONFIG_KGDB
221                 && (trapnr != VEC_EXCPT02)
222 #endif
223         ){
224                 console_verbose();
225                 oops_in_progress = 1;
226         } else if (current) {
227                 if (current->mm == NULL) {
228                         console_verbose();
229                         oops_in_progress = 1;
230                 }
231         }
232
233         /* trap_c() will be called for exceptions. During exceptions
234          * processing, the pc value should be set with retx value.
235          * With this change we can cleanup some code in signal.c- TODO
236          */
237         fp->orig_pc = fp->retx;
238         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
239                 trapnr, fp->ipend, fp->pc, fp->retx); */
240
241         /* send the appropriate signal to the user program */
242         switch (trapnr) {
243
244         /* This table works in conjuction with the one in ./mach-common/entry.S
245          * Some exceptions are handled there (in assembly, in exception space)
246          * Some are handled here, (in C, in interrupt space)
247          * Some, like CPLB, are handled in both, where the normal path is
248          * handled in assembly/exception space, and the error path is handled
249          * here
250          */
251
252         /* 0x00 - Linux Syscall, getting here is an error */
253         /* 0x01 - userspace gdb breakpoint, handled here */
254         case VEC_EXCPT01:
255                 info.si_code = TRAP_ILLTRAP;
256                 sig = SIGTRAP;
257                 CHK_DEBUGGER_TRAP_MAYBE();
258                 /* Check if this is a breakpoint in kernel space */
259                 if (fp->ipend & 0xffc0)
260                         return;
261                 else
262                         break;
263 #ifdef CONFIG_KGDB
264         case VEC_EXCPT02 :               /* gdb connection */
265                 info.si_code = TRAP_ILLTRAP;
266                 sig = SIGTRAP;
267                 CHK_DEBUGGER_TRAP();
268                 return;
269 #else
270         /* 0x02 - User Defined, Caught by default */
271 #endif
272         /* 0x03 - User Defined, userspace stack overflow */
273         case VEC_EXCPT03:
274                 info.si_code = SEGV_STACKFLOW;
275                 sig = SIGSEGV;
276                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
277                 CHK_DEBUGGER_TRAP();
278                 break;
279         /* 0x04 - User Defined, Caught by default */
280         /* 0x05 - User Defined, Caught by default */
281         /* 0x06 - User Defined, Caught by default */
282         /* 0x07 - User Defined, Caught by default */
283         /* 0x08 - User Defined, Caught by default */
284         /* 0x09 - User Defined, Caught by default */
285         /* 0x0A - User Defined, Caught by default */
286         /* 0x0B - User Defined, Caught by default */
287         /* 0x0C - User Defined, Caught by default */
288         /* 0x0D - User Defined, Caught by default */
289         /* 0x0E - User Defined, Caught by default */
290         /* 0x0F - User Defined, Caught by default */
291         /* 0x10 HW Single step, handled here */
292         case VEC_STEP:
293                 info.si_code = TRAP_STEP;
294                 sig = SIGTRAP;
295                 CHK_DEBUGGER_TRAP_MAYBE();
296                 /* Check if this is a single step in kernel space */
297                 if (fp->ipend & 0xffc0)
298                         return;
299                 else
300                         break;
301         /* 0x11 - Trace Buffer Full, handled here */
302         case VEC_OVFLOW:
303                 info.si_code = TRAP_TRACEFLOW;
304                 sig = SIGTRAP;
305                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
306                 CHK_DEBUGGER_TRAP();
307                 break;
308         /* 0x12 - Reserved, Caught by default */
309         /* 0x13 - Reserved, Caught by default */
310         /* 0x14 - Reserved, Caught by default */
311         /* 0x15 - Reserved, Caught by default */
312         /* 0x16 - Reserved, Caught by default */
313         /* 0x17 - Reserved, Caught by default */
314         /* 0x18 - Reserved, Caught by default */
315         /* 0x19 - Reserved, Caught by default */
316         /* 0x1A - Reserved, Caught by default */
317         /* 0x1B - Reserved, Caught by default */
318         /* 0x1C - Reserved, Caught by default */
319         /* 0x1D - Reserved, Caught by default */
320         /* 0x1E - Reserved, Caught by default */
321         /* 0x1F - Reserved, Caught by default */
322         /* 0x20 - Reserved, Caught by default */
323         /* 0x21 - Undefined Instruction, handled here */
324         case VEC_UNDEF_I:
325                 info.si_code = ILL_ILLOPC;
326                 sig = SIGILL;
327                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
328                 CHK_DEBUGGER_TRAP();
329                 break;
330         /* 0x22 - Illegal Instruction Combination, handled here */
331         case VEC_ILGAL_I:
332                 info.si_code = ILL_ILLPARAOP;
333                 sig = SIGILL;
334                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
335                 CHK_DEBUGGER_TRAP();
336                 break;
337         /* 0x23 - Data CPLB protection violation, handled here */
338         case VEC_CPLB_VL:
339                 info.si_code = ILL_CPLB_VI;
340                 sig = SIGBUS;
341                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
342                 CHK_DEBUGGER_TRAP();
343                 break;
344         /* 0x24 - Data access misaligned, handled here */
345         case VEC_MISALI_D:
346                 info.si_code = BUS_ADRALN;
347                 sig = SIGBUS;
348                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
349                 CHK_DEBUGGER_TRAP();
350                 break;
351         /* 0x25 - Unrecoverable Event, handled here */
352         case VEC_UNCOV:
353                 info.si_code = ILL_ILLEXCPT;
354                 sig = SIGILL;
355                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
356                 CHK_DEBUGGER_TRAP();
357                 break;
358         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
359                 error case is handled here */
360         case VEC_CPLB_M:
361                 info.si_code = BUS_ADRALN;
362                 sig = SIGBUS;
363                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
364                 CHK_DEBUGGER_TRAP();
365                 break;
366         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
367         case VEC_CPLB_MHIT:
368                 info.si_code = ILL_CPLB_MULHIT;
369                 sig = SIGSEGV;
370 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
371                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
372                         printk(KERN_NOTICE "NULL pointer access\n");
373                 else
374 #endif
375                         printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
376                 CHK_DEBUGGER_TRAP();
377                 break;
378         /* 0x28 - Emulation Watchpoint, handled here */
379         case VEC_WATCH:
380                 info.si_code = TRAP_WATCHPT;
381                 sig = SIGTRAP;
382                 pr_debug(EXC_0x28(KERN_DEBUG));
383                 CHK_DEBUGGER_TRAP_MAYBE();
384                 /* Check if this is a watchpoint in kernel space */
385                 if (fp->ipend & 0xffc0)
386                         return;
387                 else
388                         break;
389 #ifdef CONFIG_BF535
390         /* 0x29 - Instruction fetch access error (535 only) */
391         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
392                 info.si_code = BUS_OPFETCH;
393                 sig = SIGBUS;
394                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
395                 CHK_DEBUGGER_TRAP();
396                 break;
397 #else
398         /* 0x29 - Reserved, Caught by default */
399 #endif
400         /* 0x2A - Instruction fetch misaligned, handled here */
401         case VEC_MISALI_I:
402                 info.si_code = BUS_ADRALN;
403                 sig = SIGBUS;
404                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
405                 CHK_DEBUGGER_TRAP();
406                 break;
407         /* 0x2B - Instruction CPLB protection violation, handled here */
408         case VEC_CPLB_I_VL:
409                 info.si_code = ILL_CPLB_VI;
410                 sig = SIGBUS;
411                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
412                 CHK_DEBUGGER_TRAP();
413                 break;
414         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
415         case VEC_CPLB_I_M:
416                 info.si_code = ILL_CPLB_MISS;
417                 sig = SIGBUS;
418                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
419                 CHK_DEBUGGER_TRAP();
420                 break;
421         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
422         case VEC_CPLB_I_MHIT:
423                 info.si_code = ILL_CPLB_MULHIT;
424                 sig = SIGSEGV;
425 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
426                 if (saved_icplb_fault_addr < FIXED_CODE_START)
427                         printk(KERN_NOTICE "Jump to NULL address\n");
428                 else
429 #endif
430                         printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
431                 CHK_DEBUGGER_TRAP();
432                 break;
433         /* 0x2E - Illegal use of Supervisor Resource, handled here */
434         case VEC_ILL_RES:
435                 info.si_code = ILL_PRVOPC;
436                 sig = SIGILL;
437                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
438                 CHK_DEBUGGER_TRAP();
439                 break;
440         /* 0x2F - Reserved, Caught by default */
441         /* 0x30 - Reserved, Caught by default */
442         /* 0x31 - Reserved, Caught by default */
443         /* 0x32 - Reserved, Caught by default */
444         /* 0x33 - Reserved, Caught by default */
445         /* 0x34 - Reserved, Caught by default */
446         /* 0x35 - Reserved, Caught by default */
447         /* 0x36 - Reserved, Caught by default */
448         /* 0x37 - Reserved, Caught by default */
449         /* 0x38 - Reserved, Caught by default */
450         /* 0x39 - Reserved, Caught by default */
451         /* 0x3A - Reserved, Caught by default */
452         /* 0x3B - Reserved, Caught by default */
453         /* 0x3C - Reserved, Caught by default */
454         /* 0x3D - Reserved, Caught by default */
455         /* 0x3E - Reserved, Caught by default */
456         /* 0x3F - Reserved, Caught by default */
457         case VEC_HWERR:
458                 info.si_code = BUS_ADRALN;
459                 sig = SIGBUS;
460                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
461                 /* System MMR Error */
462                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
463                         info.si_code = BUS_ADRALN;
464                         sig = SIGBUS;
465                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
466                         break;
467                 /* External Memory Addressing Error */
468                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
469                         info.si_code = BUS_ADRERR;
470                         sig = SIGBUS;
471                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
472                         break;
473                 /* Performance Monitor Overflow */
474                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
475                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
476                         break;
477                 /* RAISE 5 instruction */
478                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
479                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
480                         break;
481                 default:        /* Reserved */
482                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
483                         break;
484                 }
485                 CHK_DEBUGGER_TRAP();
486                 break;
487         default:
488                 info.si_code = TRAP_ILLTRAP;
489                 sig = SIGTRAP;
490                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
491                         (fp->seqstat & SEQSTAT_EXCAUSE));
492                 CHK_DEBUGGER_TRAP();
493                 break;
494         }
495
496         BUG_ON(sig == 0);
497
498         if (sig != SIGTRAP) {
499                 unsigned long *stack;
500                 dump_bfin_process(fp);
501                 dump_bfin_mem(fp);
502                 show_regs(fp);
503
504                 /* Print out the trace buffer if it makes sense */
505 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
506                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
507                         printk(KERN_NOTICE "No trace since you do not have "
508                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
509                                 KERN_NOTICE "\n");
510                 else
511 #endif
512                         dump_bfin_trace_buffer();
513
514                 if (oops_in_progress) {
515                         /* Dump the current kernel stack */
516                         printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
517                         show_stack(current, NULL);
518
519                         print_modules();
520 #ifndef CONFIG_ACCESS_CHECK
521                         printk(KERN_EMERG "Please turn on "
522                                "CONFIG_ACCESS_CHECK\n");
523 #endif
524                         panic("Kernel exception");
525                 } else {
526                         /* Dump the user space stack */
527                         stack = (unsigned long *)rdusp();
528                         printk(KERN_NOTICE "Userspace Stack\n");
529                         show_stack(NULL, stack);
530                 }
531         }
532
533         info.si_signo = sig;
534         info.si_errno = 0;
535         info.si_addr = (void __user *)fp->pc;
536         force_sig_info(sig, &info, current);
537
538         trace_buffer_restore(j);
539         return;
540 }
541
542 /* Typical exception handling routines  */
543
544 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
545
546 /*
547  * Similar to get_user, do some address checking, then dereference
548  * Return true on sucess, false on bad address
549  */
550 bool get_instruction(unsigned short *val, unsigned short *address)
551 {
552
553         unsigned long addr;
554
555         addr = (unsigned long)address;
556
557         /* Check for odd addresses */
558         if (addr & 0x1)
559                 return false;
560
561         /* Check that things do not wrap around */
562         if (addr > (addr + 2))
563                 return false;
564
565         /*
566          * Since we are in exception context, we need to do a little address checking
567          * We need to make sure we are only accessing valid memory, and
568          * we don't read something in the async space that can hang forever
569          */
570         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
571 #if L2_LENGTH != 0
572             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
573 #endif
574             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
575 #if L1_DATA_A_LENGTH != 0
576             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
577 #endif
578 #if L1_DATA_B_LENGTH != 0
579             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
580 #endif
581             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
582             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
583                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
584             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
585                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
586             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
587                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
588             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
589               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
590                 *val = *address;
591                 return true;
592         }
593
594 #if L1_CODE_LENGTH != 0
595         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
596                 dma_memcpy(val, address, 2);
597                 return true;
598         }
599 #endif
600
601
602         return false;
603 }
604
605 /* 
606  * decode the instruction if we are printing out the trace, as it
607  * makes things easier to follow, without running it through objdump
608  * These are the normal instructions which cause change of flow, which
609  * would be at the source of the trace buffer
610  */
611 void decode_instruction(unsigned short *address)
612 {
613         unsigned short opcode;
614
615         if (get_instruction(&opcode, address)) {
616                 if (opcode == 0x0010)
617                         printk("RTS");
618                 else if (opcode == 0x0011)
619                         printk("RTI");
620                 else if (opcode == 0x0012)
621                         printk("RTX");
622                 else if (opcode >= 0x0050 && opcode <= 0x0057)
623                         printk("JUMP (P%i)", opcode & 7);
624                 else if (opcode >= 0x0060 && opcode <= 0x0067)
625                         printk("CALL (P%i)", opcode & 7);
626                 else if (opcode >= 0x0070 && opcode <= 0x0077)
627                         printk("CALL (PC+P%i)", opcode & 7);
628                 else if (opcode >= 0x0080 && opcode <= 0x0087)
629                         printk("JUMP (PC+P%i)", opcode & 7);
630                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
631                         printk("IF !CC JUMP");
632                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
633                         printk("IF CC JUMP");
634                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
635                         printk("JUMP.S");
636                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
637                         printk("LSETUP");
638                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
639                         printk("JUMP.L");
640                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
641                         printk("CALL pcrel");
642                 else
643                         printk("0x%04x", opcode);
644         }
645
646 }
647
648 void dump_bfin_trace_buffer(void)
649 {
650 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
651         int tflags, i = 0;
652         char buf[150];
653         unsigned short *addr;
654 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
655         int j, index;
656 #endif
657
658         trace_buffer_save(tflags);
659
660         printk(KERN_NOTICE "Hardware Trace:\n");
661
662 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
663         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
664 #endif
665
666         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
667                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
668                         decode_address(buf, (unsigned long)bfin_read_TBUF());
669                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
670                         addr = (unsigned short *)bfin_read_TBUF();
671                         decode_address(buf, (unsigned long)addr);
672                         printk(KERN_NOTICE "     Source : %s ", buf);
673                         decode_instruction(addr);
674                         printk("\n");
675                 }
676         }
677
678 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
679         if (trace_buff_offset)
680                 index = trace_buff_offset / 4;
681         else
682                 index = EXPAND_LEN;
683
684         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
685         while (j) {
686                 decode_address(buf, software_trace_buff[index]);
687                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
688                 index -= 1;
689                 if (index < 0 )
690                         index = EXPAND_LEN;
691                 decode_address(buf, software_trace_buff[index]);
692                 printk(KERN_NOTICE "     Source : %s ", buf);
693                 decode_instruction((unsigned short *)software_trace_buff[index]);
694                 printk("\n");
695                 index -= 1;
696                 if (index < 0)
697                         index = EXPAND_LEN;
698                 j--;
699                 i++;
700         }
701 #endif
702
703         trace_buffer_restore(tflags);
704 #endif
705 }
706 EXPORT_SYMBOL(dump_bfin_trace_buffer);
707
708 /*
709  * Checks to see if the address pointed to is either a
710  * 16-bit CALL instruction, or a 32-bit CALL instruction
711  */
712 bool is_bfin_call(unsigned short *addr)
713 {
714         unsigned short opcode = 0, *ins_addr;
715         ins_addr = (unsigned short *)addr;
716
717         if (!get_instruction(&opcode, ins_addr))
718                 return false;
719
720         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
721             (opcode >= 0x0070 && opcode <= 0x0077))
722                 return true;
723
724         ins_addr--;
725         if (!get_instruction(&opcode, ins_addr))
726                 return false;
727
728         if (opcode >= 0xE300 && opcode <= 0xE3FF)
729                 return true;
730
731         return false;
732
733 }
734 void show_stack(struct task_struct *task, unsigned long *stack)
735 {
736         unsigned int *addr, *endstack, *fp = 0, *frame;
737         unsigned short *ins_addr;
738         char buf[150];
739         unsigned int i, j, ret_addr, frame_no = 0;
740
741         /*
742          * If we have been passed a specific stack, use that one otherwise
743          *    if we have been passed a task structure, use that, otherwise
744          *    use the stack of where the variable "stack" exists
745          */
746
747         if (stack == NULL) {
748                 if (task) {
749                         /* We know this is a kernel stack, so this is the start/end */
750                         stack = (unsigned long *)task->thread.ksp;
751                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
752                 } else {
753                         /* print out the existing stack info */
754                         stack = (unsigned long *)&stack;
755                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
756                 }
757         } else
758                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
759
760         decode_address(buf, (unsigned int)stack);
761         printk(KERN_NOTICE "Stack info:\n" KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
762         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
763
764         /* First thing is to look for a frame pointer */
765         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
766                 addr < endstack; addr++, i++) {
767                 if (*addr & 0x1)
768                         continue;
769                 ins_addr = (unsigned short *)*addr;
770                 ins_addr--;
771                 if (is_bfin_call(ins_addr))
772                         fp = addr - 1;
773
774                 if (fp) {
775                         /* Let's check to see if it is a frame pointer */
776                         while (fp >= (addr - 1) && fp < endstack && fp)
777                                 fp = (unsigned int *)*fp;
778                         if (fp == 0 || fp == endstack) {
779                                 fp = addr - 1;
780                                 break;
781                         }
782                         fp = 0;
783                 }
784         }
785         if (fp) {
786                 frame = fp;
787                 printk(" FP: (0x%p)\n", fp);
788         } else
789                 frame = 0;
790
791         /*
792          * Now that we think we know where things are, we
793          * walk the stack again, this time printing things out
794          * incase there is no frame pointer, we still look for
795          * valid return addresses
796          */
797
798         /* First time print out data, next time, print out symbols */
799         for (j = 0; j <= 1; j++) {
800                 if (j)
801                         printk(KERN_NOTICE "Return addresses in stack:\n");
802                 else
803                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
804
805                 fp = frame;
806                 frame_no = 0;
807
808                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
809                      addr <= endstack; addr++, i++) {
810
811                         ret_addr = 0;
812                         if (!j && i % 8 == 0)
813                                 printk("\n" KERN_NOTICE "%p:",addr);
814
815                         /* if it is an odd address, or zero, just skip it */
816                         if (*addr & 0x1 || !*addr)
817                                 goto print;
818
819                         ins_addr = (unsigned short *)*addr;
820
821                         /* Go back one instruction, and see if it is a CALL */
822                         ins_addr--;
823                         ret_addr = is_bfin_call(ins_addr);
824  print:
825                         if (!j && stack == (unsigned long *)addr)
826                                 printk("[%08x]", *addr);
827                         else if (ret_addr)
828                                 if (j) {
829                                         decode_address(buf, (unsigned int)*addr);
830                                         if (frame == addr) {
831                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
832                                                 continue;
833                                         }
834                                         printk(KERN_NOTICE "    address : %s\n", buf);
835                                 } else
836                                         printk("<%08x>", *addr);
837                         else if (fp == addr) {
838                                 if (j)
839                                         frame = addr+1;
840                                 else
841                                         printk("(%08x)", *addr);
842
843                                 fp = (unsigned int *)*addr;
844                                 frame_no++;
845
846                         } else if (!j)
847                                 printk(" %08x ", *addr);
848                 }
849                 if (!j)
850                         printk("\n");
851         }
852
853 }
854
855 void dump_stack(void)
856 {
857         unsigned long stack;
858 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
859         int tflags;
860 #endif
861         trace_buffer_save(tflags);
862         dump_bfin_trace_buffer();
863         show_stack(current, &stack);
864         trace_buffer_restore(tflags);
865 }
866 EXPORT_SYMBOL(dump_stack);
867
868 void dump_bfin_process(struct pt_regs *fp)
869 {
870         /* We should be able to look at fp->ipend, but we don't push it on the
871          * stack all the time, so do this until we fix that */
872         unsigned int context = bfin_read_IPEND();
873
874         if (oops_in_progress)
875                 printk(KERN_EMERG "Kernel OOPS in progress\n");
876
877         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
878                 printk(KERN_NOTICE "HW Error context\n");
879         else if (context & 0x0020)
880                 printk(KERN_NOTICE "Deferred Exception context\n");
881         else if (context & 0x3FC0)
882                 printk(KERN_NOTICE "Interrupt context\n");
883         else if (context & 0x4000)
884                 printk(KERN_NOTICE "Deferred Interrupt context\n");
885         else if (context & 0x8000)
886                 printk(KERN_NOTICE "Kernel process context\n");
887
888         /* Because we are crashing, and pointers could be bad, we check things
889          * pretty closely before we use them
890          */
891         if ((unsigned long)current >= FIXED_CODE_START &&
892             !((unsigned long)current & 0x3) && current->pid) {
893                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
894                 if (current->comm >= (char *)FIXED_CODE_START)
895                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
896                                 current->comm, current->pid);
897                 else
898                         printk(KERN_NOTICE "COMM= invalid\n");
899
900                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
901                         printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
902                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
903                                 KERN_NOTICE "\n",
904                                 (void *)current->mm->start_code,
905                                 (void *)current->mm->end_code,
906                                 (void *)current->mm->start_data,
907                                 (void *)current->mm->end_data,
908                                 (void *)current->mm->end_data,
909                                 (void *)current->mm->brk,
910                                 (void *)current->mm->start_stack);
911                 else
912                         printk(KERN_NOTICE "invalid mm\n");
913         } else
914                 printk(KERN_NOTICE "\n" KERN_NOTICE
915                      "No Valid process in current context\n");
916 }
917
918 void dump_bfin_mem(struct pt_regs *fp)
919 {
920         unsigned short *addr, *erraddr, val = 0, err = 0;
921         char sti = 0, buf[6];
922
923         erraddr = (void *)fp->pc;
924
925         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
926
927         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
928              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
929              addr++) {
930                 if (!((unsigned long)addr & 0xF))
931                         printk("\n" KERN_NOTICE "0x%p: ", addr);
932
933                 if (get_instruction(&val, addr)) {
934                                 val = 0;
935                                 sprintf(buf, "????");
936                 } else
937                         sprintf(buf, "%04x", val);
938
939                 if (addr == erraddr) {
940                         printk("[%s]", buf);
941                         err = val;
942                 } else
943                         printk(" %s ", buf);
944
945                 /* Do any previous instructions turn on interrupts? */
946                 if (addr <= erraddr &&                          /* in the past */
947                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
948                       val == 0x017b))                           /* [SP++] = RETI */
949                         sti = 1;
950         }
951
952         printk("\n");
953
954         /* Hardware error interrupts can be deferred */
955         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
956             oops_in_progress)){
957                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
958 #ifndef CONFIG_DEBUG_HWERR
959                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
960                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
961                          " better idea where it came from\n");
962 #else
963                 /* If we are handling only one peripheral interrupt
964                  * and current mm and pid are valid, and the last error
965                  * was in that user space process's text area
966                  * print it out - because that is where the problem exists
967                  */
968                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
969                      (current->pid && current->mm)) {
970                         /* And the last RETI points to the current userspace context */
971                         if ((fp + 1)->pc >= current->mm->start_code &&
972                             (fp + 1)->pc <= current->mm->end_code) {
973                                 printk(KERN_NOTICE "It might be better to look around here : \n");
974                                 printk(KERN_NOTICE "-------------------------------------------\n");
975                                 show_regs(fp + 1);
976                                 printk(KERN_NOTICE "-------------------------------------------\n");
977                         }
978                 }
979 #endif
980         }
981 }
982
983 void show_regs(struct pt_regs *fp)
984 {
985         char buf [150];
986         struct irqaction *action;
987         unsigned int i;
988         unsigned long flags;
989
990         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
991         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
992                 (long)fp->seqstat, fp->ipend, fp->syscfg);
993         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
994                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
995         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
996                 fp->seqstat & SEQSTAT_EXCAUSE);
997         for (i = 6; i <= 15 ; i++) {
998                 if (fp->ipend & (1 << i)) {
999                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1000                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1001                 }
1002         }
1003
1004         /* if no interrupts are going off, don't print this out */
1005         if (fp->ipend & ~0x3F) {
1006                 for (i = 0; i < (NR_IRQS - 1); i++) {
1007                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1008                         action = irq_desc[i].action;
1009                         if (!action)
1010                                 goto unlock;
1011
1012                         decode_address(buf, (unsigned int)action->handler);
1013                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1014                         for (action = action->next; action; action = action->next) {
1015                                 decode_address(buf, (unsigned int)action->handler);
1016                                 printk(", %s", buf);
1017                         }
1018                         printk("\n");
1019 unlock:
1020                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1021                 }
1022         }
1023
1024         decode_address(buf, fp->rete);
1025         printk(KERN_NOTICE " RETE: %s\n", buf);
1026         decode_address(buf, fp->retn);
1027         printk(KERN_NOTICE " RETN: %s\n", buf);
1028         decode_address(buf, fp->retx);
1029         printk(KERN_NOTICE " RETX: %s\n", buf);
1030         decode_address(buf, fp->rets);
1031         printk(KERN_NOTICE " RETS: %s\n", buf);
1032         decode_address(buf, fp->pc);
1033         printk(KERN_NOTICE " PC  : %s\n", buf);
1034
1035         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1036             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1037                 decode_address(buf, saved_dcplb_fault_addr);
1038                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1039                 decode_address(buf, saved_icplb_fault_addr);
1040                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1041         }
1042
1043         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1044         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1045                 fp->r0, fp->r1, fp->r2, fp->r3);
1046         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1047                 fp->r4, fp->r5, fp->r6, fp->r7);
1048         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1049                 fp->p0, fp->p1, fp->p2, fp->p3);
1050         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1051                 fp->p4, fp->p5, fp->fp, (long)fp);
1052         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1053                 fp->lb0, fp->lt0, fp->lc0);
1054         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1055                 fp->lb1, fp->lt1, fp->lc1);
1056         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1057                 fp->b0, fp->l0, fp->m0, fp->i0);
1058         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1059                 fp->b1, fp->l1, fp->m1, fp->i1);
1060         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1061                 fp->b2, fp->l2, fp->m2, fp->i2);
1062         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1063                 fp->b3, fp->l3, fp->m3, fp->i3);
1064         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1065                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1066
1067         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1068                 rdusp(), fp->astat);
1069
1070         printk(KERN_NOTICE "\n");
1071 }
1072
1073 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1074 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1075 #endif
1076
1077 asmlinkage int sys_bfin_spinlock(int *spinlock)
1078 {
1079         int ret = 0;
1080         int tmp = 0;
1081
1082         local_irq_disable();
1083         ret = get_user(tmp, spinlock);
1084         if (ret == 0) {
1085                 if (tmp)
1086                         ret = 1;
1087                 tmp = 1;
1088                 put_user(tmp, spinlock);
1089         }
1090         local_irq_enable();
1091         return ret;
1092 }
1093
1094 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1095 {
1096         void (*curr_handler)(void);
1097
1098         if (exception > 0x3F)
1099                 return -EINVAL;
1100
1101         curr_handler = ex_table[exception];
1102
1103         if (curr_handler != ex_replaceable)
1104                 return -EBUSY;
1105
1106         ex_table[exception] = handler;
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL(bfin_request_exception);
1111
1112 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1113 {
1114         void (*curr_handler)(void);
1115
1116         if (exception > 0x3F)
1117                 return -EINVAL;
1118
1119         curr_handler = ex_table[exception];
1120
1121         if (curr_handler != handler)
1122                 return -EBUSY;
1123
1124         ex_table[exception] = ex_replaceable;
1125
1126         return 0;
1127 }
1128 EXPORT_SYMBOL(bfin_free_exception);
1129
1130 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1131 {
1132         switch (cplb_panic) {
1133         case CPLB_NO_UNLOCKED:
1134                 printk(KERN_EMERG "All CPLBs are locked\n");
1135                 break;
1136         case CPLB_PROT_VIOL:
1137                 return;
1138         case CPLB_NO_ADDR_MATCH:
1139                 return;
1140         case CPLB_UNKNOWN_ERR:
1141                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1142                 break;
1143         }
1144
1145         oops_in_progress = 1;
1146
1147         dump_bfin_process(fp);
1148         dump_bfin_mem(fp);
1149         show_regs(fp);
1150         dump_stack();
1151         panic("Unrecoverable event\n");
1152 }