2 * File: arch/blackfin/kernel/traps.c
4 * Author: Hamish Macdonald
7 * Description: uses S/W interrupt 15 for the system calls
10 * Copyright 2004-2006 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
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.
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.
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
30 #include <linux/uaccess.h>
31 #include <linux/interrupt.h>
32 #include <linux/module.h>
33 #include <linux/kallsyms.h>
35 #include <asm/traps.h>
36 #include <asm/cacheflush.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>
45 # include <linux/kgdb.h>
47 # define CHK_DEBUGGER_TRAP() \
49 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
51 # define CHK_DEBUGGER_TRAP_MAYBE() \
54 CHK_DEBUGGER_TRAP(); \
57 # define CHK_DEBUGGER_TRAP() do { } while (0)
58 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
62 #ifdef CONFIG_DEBUG_VERBOSE
63 #define verbose_printk(fmt, arg...) \
66 #define verbose_printk(fmt, arg...) \
67 ({ if (0) printk(fmt, ##arg); 0; })
70 /* Initiate the event table handler */
71 void __init
trap_init(void)
74 bfin_write_EVT3(trap
);
78 static void decode_address(char *buf
, unsigned long address
)
80 #ifdef CONFIG_DEBUG_VERBOSE
81 struct vm_list_struct
*vml
;
82 struct task_struct
*p
;
84 unsigned long flags
, offset
;
85 unsigned char in_atomic
= (bfin_read_IPEND() & 0x10) || in_atomic();
87 #ifdef CONFIG_KALLSYMS
88 unsigned long symsize
;
94 /* look up the address and see if we are in kernel space */
95 symname
= kallsyms_lookup(address
, &symsize
, &offset
, &modname
, namebuf
);
98 /* yeah! kernel space! */
100 modname
= delim
= "";
101 sprintf(buf
, "<0x%p> { %s%s%s%s + 0x%lx }",
102 (void *)address
, delim
, modname
, delim
, symname
,
103 (unsigned long)offset
);
109 /* Problem in fixed code section? */
110 if (address
>= FIXED_CODE_START
&& address
< FIXED_CODE_END
) {
111 sprintf(buf
, "<0x%p> /* Maybe fixed code section */", (void *)address
);
115 /* Problem somewhere before the kernel start address */
116 if (address
< CONFIG_BOOT_LOAD
) {
117 sprintf(buf
, "<0x%p> /* Maybe null pointer? */", (void *)address
);
121 /* looks like we're off in user-land, so let's walk all the
122 * mappings of all our processes and see if we can't be a whee
125 write_lock_irqsave(&tasklist_lock
, flags
);
126 for_each_process(p
) {
127 mm
= (in_atomic
? p
->mm
: get_task_mm(p
));
131 vml
= mm
->context
.vmlist
;
133 struct vm_area_struct
*vma
= vml
->vma
;
135 if (address
>= vma
->vm_start
&& address
< vma
->vm_end
) {
137 char *name
= p
->comm
;
138 struct file
*file
= vma
->vm_file
;
141 char *d_name
= d_path(&file
->f_path
, _tmpbuf
,
147 /* FLAT does not have its text aligned to the start of
148 * the map while FDPIC ELF does ...
151 /* before we can check flat/fdpic, we need to
152 * make sure current is valid
154 if ((unsigned long)current
>= FIXED_CODE_START
&&
155 !((unsigned long)current
& 0x3)) {
157 (address
> current
->mm
->start_code
) &&
158 (address
< current
->mm
->end_code
))
159 offset
= address
- current
->mm
->start_code
;
161 offset
= (address
- vma
->vm_start
) +
162 (vma
->vm_pgoff
<< PAGE_SHIFT
);
164 sprintf(buf
, "<0x%p> [ %s + 0x%lx ]",
165 (void *)address
, name
, offset
);
167 sprintf(buf
, "<0x%p> [ %s vma:0x%lx-0x%lx]",
168 (void *)address
, name
,
169 vma
->vm_start
, vma
->vm_end
);
175 sprintf(buf
, "<0x%p> [ %s ] dynamic memory", (void *)address
, name
);
186 /* we were unable to find this address anywhere */
187 sprintf(buf
, "<0x%p> /* kernel dynamic memory */", (void *)address
);
190 write_unlock_irqrestore(&tasklist_lock
, flags
);
196 asmlinkage
void double_fault_c(struct pt_regs
*fp
)
199 oops_in_progress
= 1;
200 #ifdef CONFIG_DEBUG_VERBOSE
201 printk(KERN_EMERG
"\n" KERN_EMERG
"Double Fault\n");
202 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
203 if (((long)fp
->seqstat
& SEQSTAT_EXCAUSE
) == VEC_UNCOV
) {
204 unsigned int cpu
= smp_processor_id();
206 decode_address(buf
, cpu_pda
[cpu
].retx
);
207 printk(KERN_EMERG
"While handling exception (EXCAUSE = 0x%x) at %s:\n",
208 (unsigned int)cpu_pda
[cpu
].seqstat
& SEQSTAT_EXCAUSE
, buf
);
209 decode_address(buf
, cpu_pda
[cpu
].dcplb_fault_addr
);
210 printk(KERN_NOTICE
" DCPLB_FAULT_ADDR: %s\n", buf
);
211 decode_address(buf
, cpu_pda
[cpu
].icplb_fault_addr
);
212 printk(KERN_NOTICE
" ICPLB_FAULT_ADDR: %s\n", buf
);
214 decode_address(buf
, fp
->retx
);
215 printk(KERN_NOTICE
"The instruction at %s caused a double exception\n", buf
);
219 dump_bfin_process(fp
);
224 panic("Double Fault - unrecoverable event\n");
228 asmlinkage
void trap_c(struct pt_regs
*fp
)
230 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
233 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
234 unsigned int cpu
= smp_processor_id();
238 unsigned long trapnr
= fp
->seqstat
& SEQSTAT_EXCAUSE
;
240 trace_buffer_save(j
);
242 /* Important - be very careful dereferncing pointers - will lead to
243 * double faults if the stack has become corrupt
246 /* If the fault was caused by a kernel thread, or interrupt handler
247 * we will kernel panic, so the system reboots.
248 * If KGDB is enabled, don't set this for kernel breakpoints
251 /* TODO: check to see if we are in some sort of deferred HWERR
252 * that we should be able to recover from, not kernel panic
254 if ((bfin_read_IPEND() & 0xFFC0) && (trapnr
!= VEC_STEP
)
256 && (trapnr
!= VEC_EXCPT02
)
260 oops_in_progress
= 1;
261 } else if (current
) {
262 if (current
->mm
== NULL
) {
264 oops_in_progress
= 1;
268 /* trap_c() will be called for exceptions. During exceptions
269 * processing, the pc value should be set with retx value.
270 * With this change we can cleanup some code in signal.c- TODO
272 fp
->orig_pc
= fp
->retx
;
273 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
274 trapnr, fp->ipend, fp->pc, fp->retx); */
276 /* send the appropriate signal to the user program */
279 /* This table works in conjuction with the one in ./mach-common/entry.S
280 * Some exceptions are handled there (in assembly, in exception space)
281 * Some are handled here, (in C, in interrupt space)
282 * Some, like CPLB, are handled in both, where the normal path is
283 * handled in assembly/exception space, and the error path is handled
287 /* 0x00 - Linux Syscall, getting here is an error */
288 /* 0x01 - userspace gdb breakpoint, handled here */
290 info
.si_code
= TRAP_ILLTRAP
;
292 CHK_DEBUGGER_TRAP_MAYBE();
293 /* Check if this is a breakpoint in kernel space */
294 if (fp
->ipend
& 0xffc0)
298 /* 0x03 - User Defined, userspace stack overflow */
300 info
.si_code
= SEGV_STACKFLOW
;
302 verbose_printk(KERN_NOTICE
EXC_0x03(KERN_NOTICE
));
303 CHK_DEBUGGER_TRAP_MAYBE();
305 /* 0x02 - KGDB initial connection and break signal trap */
308 info
.si_code
= TRAP_ILLTRAP
;
313 /* 0x04 - User Defined */
314 /* 0x05 - User Defined */
315 /* 0x06 - User Defined */
316 /* 0x07 - User Defined */
317 /* 0x08 - User Defined */
318 /* 0x09 - User Defined */
319 /* 0x0A - User Defined */
320 /* 0x0B - User Defined */
321 /* 0x0C - User Defined */
322 /* 0x0D - User Defined */
323 /* 0x0E - User Defined */
324 /* 0x0F - User Defined */
325 /* If we got here, it is most likely that someone was trying to use a
326 * custom exception handler, and it is not actually installed properly
328 case VEC_EXCPT04
... VEC_EXCPT15
:
329 info
.si_code
= ILL_ILLPARAOP
;
331 verbose_printk(KERN_NOTICE
EXC_0x04(KERN_NOTICE
));
332 CHK_DEBUGGER_TRAP_MAYBE();
334 /* 0x10 HW Single step, handled here */
336 info
.si_code
= TRAP_STEP
;
338 CHK_DEBUGGER_TRAP_MAYBE();
339 /* Check if this is a single step in kernel space */
340 if (fp
->ipend
& 0xffc0)
344 /* 0x11 - Trace Buffer Full, handled here */
346 info
.si_code
= TRAP_TRACEFLOW
;
348 verbose_printk(KERN_NOTICE
EXC_0x11(KERN_NOTICE
));
349 CHK_DEBUGGER_TRAP_MAYBE();
351 /* 0x12 - Reserved, Caught by default */
352 /* 0x13 - Reserved, Caught by default */
353 /* 0x14 - Reserved, Caught by default */
354 /* 0x15 - Reserved, Caught by default */
355 /* 0x16 - Reserved, Caught by default */
356 /* 0x17 - Reserved, Caught by default */
357 /* 0x18 - Reserved, Caught by default */
358 /* 0x19 - Reserved, Caught by default */
359 /* 0x1A - Reserved, Caught by default */
360 /* 0x1B - Reserved, Caught by default */
361 /* 0x1C - Reserved, Caught by default */
362 /* 0x1D - Reserved, Caught by default */
363 /* 0x1E - Reserved, Caught by default */
364 /* 0x1F - Reserved, Caught by default */
365 /* 0x20 - Reserved, Caught by default */
366 /* 0x21 - Undefined Instruction, handled here */
368 info
.si_code
= ILL_ILLOPC
;
370 verbose_printk(KERN_NOTICE
EXC_0x21(KERN_NOTICE
));
371 CHK_DEBUGGER_TRAP_MAYBE();
373 /* 0x22 - Illegal Instruction Combination, handled here */
375 info
.si_code
= ILL_ILLPARAOP
;
377 verbose_printk(KERN_NOTICE
EXC_0x22(KERN_NOTICE
));
378 CHK_DEBUGGER_TRAP_MAYBE();
380 /* 0x23 - Data CPLB protection violation, handled here */
382 info
.si_code
= ILL_CPLB_VI
;
384 verbose_printk(KERN_NOTICE
EXC_0x23(KERN_NOTICE
));
385 CHK_DEBUGGER_TRAP_MAYBE();
387 /* 0x24 - Data access misaligned, handled here */
389 info
.si_code
= BUS_ADRALN
;
391 verbose_printk(KERN_NOTICE
EXC_0x24(KERN_NOTICE
));
392 CHK_DEBUGGER_TRAP_MAYBE();
394 /* 0x25 - Unrecoverable Event, handled here */
396 info
.si_code
= ILL_ILLEXCPT
;
398 verbose_printk(KERN_NOTICE
EXC_0x25(KERN_NOTICE
));
399 CHK_DEBUGGER_TRAP_MAYBE();
401 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
402 error case is handled here */
404 info
.si_code
= BUS_ADRALN
;
406 verbose_printk(KERN_NOTICE
EXC_0x26(KERN_NOTICE
));
408 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
410 info
.si_code
= ILL_CPLB_MULHIT
;
412 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
413 if (cpu_pda
[cpu
].dcplb_fault_addr
< FIXED_CODE_START
)
414 verbose_printk(KERN_NOTICE
"NULL pointer access\n");
417 verbose_printk(KERN_NOTICE
EXC_0x27(KERN_NOTICE
));
418 CHK_DEBUGGER_TRAP_MAYBE();
420 /* 0x28 - Emulation Watchpoint, handled here */
422 info
.si_code
= TRAP_WATCHPT
;
424 pr_debug(EXC_0x28(KERN_DEBUG
));
425 CHK_DEBUGGER_TRAP_MAYBE();
426 /* Check if this is a watchpoint in kernel space */
427 if (fp
->ipend
& 0xffc0)
432 /* 0x29 - Instruction fetch access error (535 only) */
433 case VEC_ISTRU_VL
: /* ADSP-BF535 only (MH) */
434 info
.si_code
= BUS_OPFETCH
;
436 verbose_printk(KERN_NOTICE
"BF535: VEC_ISTRU_VL\n");
437 CHK_DEBUGGER_TRAP_MAYBE();
440 /* 0x29 - Reserved, Caught by default */
442 /* 0x2A - Instruction fetch misaligned, handled here */
444 info
.si_code
= BUS_ADRALN
;
446 verbose_printk(KERN_NOTICE
EXC_0x2A(KERN_NOTICE
));
447 CHK_DEBUGGER_TRAP_MAYBE();
449 /* 0x2B - Instruction CPLB protection violation, handled here */
451 info
.si_code
= ILL_CPLB_VI
;
453 verbose_printk(KERN_NOTICE
EXC_0x2B(KERN_NOTICE
));
454 CHK_DEBUGGER_TRAP_MAYBE();
456 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
458 info
.si_code
= ILL_CPLB_MISS
;
460 verbose_printk(KERN_NOTICE
EXC_0x2C(KERN_NOTICE
));
462 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
463 case VEC_CPLB_I_MHIT
:
464 info
.si_code
= ILL_CPLB_MULHIT
;
466 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
467 if (cpu_pda
[cpu
].icplb_fault_addr
< FIXED_CODE_START
)
468 verbose_printk(KERN_NOTICE
"Jump to NULL address\n");
471 verbose_printk(KERN_NOTICE
EXC_0x2D(KERN_NOTICE
));
472 CHK_DEBUGGER_TRAP_MAYBE();
474 /* 0x2E - Illegal use of Supervisor Resource, handled here */
476 info
.si_code
= ILL_PRVOPC
;
478 verbose_printk(KERN_NOTICE
EXC_0x2E(KERN_NOTICE
));
479 CHK_DEBUGGER_TRAP_MAYBE();
481 /* 0x2F - Reserved, Caught by default */
482 /* 0x30 - Reserved, Caught by default */
483 /* 0x31 - Reserved, Caught by default */
484 /* 0x32 - Reserved, Caught by default */
485 /* 0x33 - Reserved, Caught by default */
486 /* 0x34 - Reserved, Caught by default */
487 /* 0x35 - Reserved, Caught by default */
488 /* 0x36 - Reserved, Caught by default */
489 /* 0x37 - Reserved, Caught by default */
490 /* 0x38 - Reserved, Caught by default */
491 /* 0x39 - Reserved, Caught by default */
492 /* 0x3A - Reserved, Caught by default */
493 /* 0x3B - Reserved, Caught by default */
494 /* 0x3C - Reserved, Caught by default */
495 /* 0x3D - Reserved, Caught by default */
496 /* 0x3E - Reserved, Caught by default */
497 /* 0x3F - Reserved, Caught by default */
499 info
.si_code
= BUS_ADRALN
;
501 switch (fp
->seqstat
& SEQSTAT_HWERRCAUSE
) {
502 /* System MMR Error */
503 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR
):
504 info
.si_code
= BUS_ADRALN
;
506 verbose_printk(KERN_NOTICE
HWC_x2(KERN_NOTICE
));
508 /* External Memory Addressing Error */
509 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR
):
510 info
.si_code
= BUS_ADRERR
;
512 verbose_printk(KERN_NOTICE
HWC_x3(KERN_NOTICE
));
514 /* Performance Monitor Overflow */
515 case (SEQSTAT_HWERRCAUSE_PERF_FLOW
):
516 verbose_printk(KERN_NOTICE
HWC_x12(KERN_NOTICE
));
518 /* RAISE 5 instruction */
519 case (SEQSTAT_HWERRCAUSE_RAISE_5
):
520 printk(KERN_NOTICE
HWC_x18(KERN_NOTICE
));
522 default: /* Reserved */
523 printk(KERN_NOTICE
HWC_default(KERN_NOTICE
));
526 CHK_DEBUGGER_TRAP_MAYBE();
529 * We should be handling all known exception types above,
530 * if we get here we hit a reserved one, so panic
533 oops_in_progress
= 1;
534 info
.si_code
= ILL_ILLPARAOP
;
536 verbose_printk(KERN_EMERG
"Caught Unhandled Exception, code = %08lx\n",
537 (fp
->seqstat
& SEQSTAT_EXCAUSE
));
538 CHK_DEBUGGER_TRAP_MAYBE();
544 if (sig
!= SIGTRAP
) {
545 dump_bfin_process(fp
);
549 /* Print out the trace buffer if it makes sense */
550 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
551 if (trapnr
== VEC_CPLB_I_M
|| trapnr
== VEC_CPLB_M
)
552 verbose_printk(KERN_NOTICE
"No trace since you do not have "
553 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
557 dump_bfin_trace_buffer();
559 if (oops_in_progress
) {
560 /* Dump the current kernel stack */
561 verbose_printk(KERN_NOTICE
"\n" KERN_NOTICE
"Kernel Stack\n");
562 show_stack(current
, NULL
);
564 #ifndef CONFIG_ACCESS_CHECK
565 verbose_printk(KERN_EMERG
"Please turn on "
566 "CONFIG_ACCESS_CHECK\n");
568 panic("Kernel exception");
570 #ifdef CONFIG_DEBUG_VERBOSE
571 unsigned long *stack
;
572 /* Dump the user space stack */
573 stack
= (unsigned long *)rdusp();
574 verbose_printk(KERN_NOTICE
"Userspace Stack\n");
575 show_stack(NULL
, stack
);
581 if (!ipipe_trap_notify(fp
->seqstat
& 0x3f, fp
))
586 info
.si_addr
= (void __user
*)fp
->pc
;
587 force_sig_info(sig
, &info
, current
);
590 trace_buffer_restore(j
);
594 /* Typical exception handling routines */
596 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
599 * Similar to get_user, do some address checking, then dereference
600 * Return true on sucess, false on bad address
602 static bool get_instruction(unsigned short *val
, unsigned short *address
)
607 addr
= (unsigned long)address
;
609 /* Check for odd addresses */
613 /* Check that things do not wrap around */
614 if (addr
> (addr
+ 2))
618 * Since we are in exception context, we need to do a little address checking
619 * We need to make sure we are only accessing valid memory, and
620 * we don't read something in the async space that can hang forever
622 if ((addr
>= FIXED_CODE_START
&& (addr
+ 2) <= physical_mem_end
) ||
624 (addr
>= L2_START
&& (addr
+ 2) <= (L2_START
+ L2_LENGTH
)) ||
626 (addr
>= BOOT_ROM_START
&& (addr
+ 2) <= (BOOT_ROM_START
+ BOOT_ROM_LENGTH
)) ||
627 #if L1_DATA_A_LENGTH != 0
628 (addr
>= L1_DATA_A_START
&& (addr
+ 2) <= (L1_DATA_A_START
+ L1_DATA_A_LENGTH
)) ||
630 #if L1_DATA_B_LENGTH != 0
631 (addr
>= L1_DATA_B_START
&& (addr
+ 2) <= (L1_DATA_B_START
+ L1_DATA_B_LENGTH
)) ||
633 (addr
>= L1_SCRATCH_START
&& (addr
+ 2) <= (L1_SCRATCH_START
+ L1_SCRATCH_LENGTH
)) ||
634 (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN
) &&
635 addr
>= ASYNC_BANK0_BASE
&& (addr
+ 2) <= (ASYNC_BANK0_BASE
+ ASYNC_BANK0_SIZE
)) ||
636 (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN
) &&
637 addr
>= ASYNC_BANK1_BASE
&& (addr
+ 2) <= (ASYNC_BANK1_BASE
+ ASYNC_BANK1_SIZE
)) ||
638 (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN
) &&
639 addr
>= ASYNC_BANK2_BASE
&& (addr
+ 2) <= (ASYNC_BANK2_BASE
+ ASYNC_BANK1_SIZE
)) ||
640 (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN
) &&
641 addr
>= ASYNC_BANK3_BASE
&& (addr
+ 2) <= (ASYNC_BANK3_BASE
+ ASYNC_BANK1_SIZE
))) {
646 #if L1_CODE_LENGTH != 0
647 if (addr
>= L1_CODE_START
&& (addr
+ 2) <= (L1_CODE_START
+ L1_CODE_LENGTH
)) {
648 isram_memcpy(val
, address
, 2);
658 * decode the instruction if we are printing out the trace, as it
659 * makes things easier to follow, without running it through objdump
660 * These are the normal instructions which cause change of flow, which
661 * would be at the source of the trace buffer
663 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
664 static void decode_instruction(unsigned short *address
)
666 unsigned short opcode
;
668 if (get_instruction(&opcode
, address
)) {
669 if (opcode
== 0x0010)
670 verbose_printk("RTS");
671 else if (opcode
== 0x0011)
672 verbose_printk("RTI");
673 else if (opcode
== 0x0012)
674 verbose_printk("RTX");
675 else if (opcode
>= 0x0050 && opcode
<= 0x0057)
676 verbose_printk("JUMP (P%i)", opcode
& 7);
677 else if (opcode
>= 0x0060 && opcode
<= 0x0067)
678 verbose_printk("CALL (P%i)", opcode
& 7);
679 else if (opcode
>= 0x0070 && opcode
<= 0x0077)
680 verbose_printk("CALL (PC+P%i)", opcode
& 7);
681 else if (opcode
>= 0x0080 && opcode
<= 0x0087)
682 verbose_printk("JUMP (PC+P%i)", opcode
& 7);
683 else if ((opcode
>= 0x1000 && opcode
<= 0x13FF) || (opcode
>= 0x1800 && opcode
<= 0x1BFF))
684 verbose_printk("IF !CC JUMP");
685 else if ((opcode
>= 0x1400 && opcode
<= 0x17ff) || (opcode
>= 0x1c00 && opcode
<= 0x1fff))
686 verbose_printk("IF CC JUMP");
687 else if (opcode
>= 0x2000 && opcode
<= 0x2fff)
688 verbose_printk("JUMP.S");
689 else if (opcode
>= 0xe080 && opcode
<= 0xe0ff)
690 verbose_printk("LSETUP");
691 else if (opcode
>= 0xe200 && opcode
<= 0xe2ff)
692 verbose_printk("JUMP.L");
693 else if (opcode
>= 0xe300 && opcode
<= 0xe3ff)
694 verbose_printk("CALL pcrel");
696 verbose_printk("0x%04x", opcode
);
702 void dump_bfin_trace_buffer(void)
704 #ifdef CONFIG_DEBUG_VERBOSE
705 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
708 unsigned short *addr
;
709 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
713 trace_buffer_save(tflags
);
715 printk(KERN_NOTICE
"Hardware Trace:\n");
717 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
718 printk(KERN_NOTICE
"WARNING: Expanded trace turned on - can not trace exceptions\n");
721 if (likely(bfin_read_TBUFSTAT() & TBUFCNT
)) {
722 for (; bfin_read_TBUFSTAT() & TBUFCNT
; i
++) {
723 decode_address(buf
, (unsigned long)bfin_read_TBUF());
724 printk(KERN_NOTICE
"%4i Target : %s\n", i
, buf
);
725 addr
= (unsigned short *)bfin_read_TBUF();
726 decode_address(buf
, (unsigned long)addr
);
727 printk(KERN_NOTICE
" Source : %s ", buf
);
728 decode_instruction(addr
);
733 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
734 if (trace_buff_offset
)
735 index
= trace_buff_offset
/ 4;
739 j
= (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN
) * 128;
741 decode_address(buf
, software_trace_buff
[index
]);
742 printk(KERN_NOTICE
"%4i Target : %s\n", i
, buf
);
746 decode_address(buf
, software_trace_buff
[index
]);
747 printk(KERN_NOTICE
" Source : %s ", buf
);
748 decode_instruction((unsigned short *)software_trace_buff
[index
]);
758 trace_buffer_restore(tflags
);
762 EXPORT_SYMBOL(dump_bfin_trace_buffer
);
765 * Checks to see if the address pointed to is either a
766 * 16-bit CALL instruction, or a 32-bit CALL instruction
768 static bool is_bfin_call(unsigned short *addr
)
770 unsigned short opcode
= 0, *ins_addr
;
771 ins_addr
= (unsigned short *)addr
;
773 if (!get_instruction(&opcode
, ins_addr
))
776 if ((opcode
>= 0x0060 && opcode
<= 0x0067) ||
777 (opcode
>= 0x0070 && opcode
<= 0x0077))
781 if (!get_instruction(&opcode
, ins_addr
))
784 if (opcode
>= 0xE300 && opcode
<= 0xE3FF)
791 void show_stack(struct task_struct
*task
, unsigned long *stack
)
794 unsigned int *addr
, *endstack
, *fp
= 0, *frame
;
795 unsigned short *ins_addr
;
797 unsigned int i
, j
, ret_addr
, frame_no
= 0;
800 * If we have been passed a specific stack, use that one otherwise
801 * if we have been passed a task structure, use that, otherwise
802 * use the stack of where the variable "stack" exists
807 /* We know this is a kernel stack, so this is the start/end */
808 stack
= (unsigned long *)task
->thread
.ksp
;
809 endstack
= (unsigned int *)(((unsigned int)(stack
) & ~(THREAD_SIZE
- 1)) + THREAD_SIZE
);
811 /* print out the existing stack info */
812 stack
= (unsigned long *)&stack
;
813 endstack
= (unsigned int *)PAGE_ALIGN((unsigned int)stack
);
816 endstack
= (unsigned int *)PAGE_ALIGN((unsigned int)stack
);
818 printk(KERN_NOTICE
"Stack info:\n");
819 decode_address(buf
, (unsigned int)stack
);
820 printk(KERN_NOTICE
" SP: [0x%p] %s\n", stack
, buf
);
822 addr
= (unsigned int *)((unsigned int)stack
& ~0x3F);
824 /* First thing is to look for a frame pointer */
825 for (addr
= (unsigned int *)((unsigned int)stack
& ~0xF), i
= 0;
826 addr
< endstack
; addr
++, i
++) {
829 ins_addr
= (unsigned short *)*addr
;
831 if (is_bfin_call(ins_addr
))
835 /* Let's check to see if it is a frame pointer */
836 while (fp
>= (addr
- 1) && fp
< endstack
&& fp
)
837 fp
= (unsigned int *)*fp
;
838 if (fp
== 0 || fp
== endstack
) {
847 printk(KERN_NOTICE
" FP: (0x%p)\n", fp
);
852 * Now that we think we know where things are, we
853 * walk the stack again, this time printing things out
854 * incase there is no frame pointer, we still look for
855 * valid return addresses
858 /* First time print out data, next time, print out symbols */
859 for (j
= 0; j
<= 1; j
++) {
861 printk(KERN_NOTICE
"Return addresses in stack:\n");
863 printk(KERN_NOTICE
" Memory from 0x%08lx to %p", ((long unsigned int)stack
& ~0xF), endstack
);
868 for (addr
= (unsigned int *)((unsigned int)stack
& ~0xF), i
= 0;
869 addr
<= endstack
; addr
++, i
++) {
872 if (!j
&& i
% 8 == 0)
873 printk("\n" KERN_NOTICE
"%p:",addr
);
875 /* if it is an odd address, or zero, just skip it */
876 if (*addr
& 0x1 || !*addr
)
879 ins_addr
= (unsigned short *)*addr
;
881 /* Go back one instruction, and see if it is a CALL */
883 ret_addr
= is_bfin_call(ins_addr
);
885 if (!j
&& stack
== (unsigned long *)addr
)
886 printk("[%08x]", *addr
);
889 decode_address(buf
, (unsigned int)*addr
);
891 printk(KERN_NOTICE
" frame %2i : %s\n", frame_no
, buf
);
894 printk(KERN_NOTICE
" address : %s\n", buf
);
896 printk("<%08x>", *addr
);
897 else if (fp
== addr
) {
901 printk("(%08x)", *addr
);
903 fp
= (unsigned int *)*addr
;
907 printk(" %08x ", *addr
);
915 void dump_stack(void)
918 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
921 trace_buffer_save(tflags
);
922 dump_bfin_trace_buffer();
923 show_stack(current
, &stack
);
924 trace_buffer_restore(tflags
);
926 EXPORT_SYMBOL(dump_stack
);
928 void dump_bfin_process(struct pt_regs
*fp
)
930 #ifdef CONFIG_DEBUG_VERBOSE
931 /* We should be able to look at fp->ipend, but we don't push it on the
932 * stack all the time, so do this until we fix that */
933 unsigned int context
= bfin_read_IPEND();
935 if (oops_in_progress
)
936 verbose_printk(KERN_EMERG
"Kernel OOPS in progress\n");
938 if (context
& 0x0020 && (fp
->seqstat
& SEQSTAT_EXCAUSE
) == VEC_HWERR
)
939 verbose_printk(KERN_NOTICE
"HW Error context\n");
940 else if (context
& 0x0020)
941 verbose_printk(KERN_NOTICE
"Deferred Exception context\n");
942 else if (context
& 0x3FC0)
943 verbose_printk(KERN_NOTICE
"Interrupt context\n");
944 else if (context
& 0x4000)
945 verbose_printk(KERN_NOTICE
"Deferred Interrupt context\n");
946 else if (context
& 0x8000)
947 verbose_printk(KERN_NOTICE
"Kernel process context\n");
949 /* Because we are crashing, and pointers could be bad, we check things
950 * pretty closely before we use them
952 if ((unsigned long)current
>= FIXED_CODE_START
&&
953 !((unsigned long)current
& 0x3) && current
->pid
) {
954 verbose_printk(KERN_NOTICE
"CURRENT PROCESS:\n");
955 if (current
->comm
>= (char *)FIXED_CODE_START
)
956 verbose_printk(KERN_NOTICE
"COMM=%s PID=%d\n",
957 current
->comm
, current
->pid
);
959 verbose_printk(KERN_NOTICE
"COMM= invalid\n");
961 printk(KERN_NOTICE
"CPU = %d\n", current_thread_info()->cpu
);
962 if (!((unsigned long)current
->mm
& 0x3) && (unsigned long)current
->mm
>= FIXED_CODE_START
)
963 verbose_printk(KERN_NOTICE
"TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
964 KERN_NOTICE
" BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
966 (void *)current
->mm
->start_code
,
967 (void *)current
->mm
->end_code
,
968 (void *)current
->mm
->start_data
,
969 (void *)current
->mm
->end_data
,
970 (void *)current
->mm
->end_data
,
971 (void *)current
->mm
->brk
,
972 (void *)current
->mm
->start_stack
);
974 verbose_printk(KERN_NOTICE
"invalid mm\n");
976 verbose_printk(KERN_NOTICE
"\n" KERN_NOTICE
977 "No Valid process in current context\n");
981 void dump_bfin_mem(struct pt_regs
*fp
)
983 #ifdef CONFIG_DEBUG_VERBOSE
984 unsigned short *addr
, *erraddr
, val
= 0, err
= 0;
985 char sti
= 0, buf
[6];
987 erraddr
= (void *)fp
->pc
;
989 verbose_printk(KERN_NOTICE
"return address: [0x%p]; contents of:", erraddr
);
991 for (addr
= (unsigned short *)((unsigned long)erraddr
& ~0xF) - 0x10;
992 addr
< (unsigned short *)((unsigned long)erraddr
& ~0xF) + 0x10;
994 if (!((unsigned long)addr
& 0xF))
995 verbose_printk("\n" KERN_NOTICE
"0x%p: ", addr
);
997 if (!get_instruction(&val
, addr
)) {
999 sprintf(buf
, "????");
1001 sprintf(buf
, "%04x", val
);
1003 if (addr
== erraddr
) {
1004 verbose_printk("[%s]", buf
);
1007 verbose_printk(" %s ", buf
);
1009 /* Do any previous instructions turn on interrupts? */
1010 if (addr
<= erraddr
&& /* in the past */
1011 ((val
>= 0x0040 && val
<= 0x0047) || /* STI instruction */
1012 val
== 0x017b)) /* [SP++] = RETI */
1016 verbose_printk("\n");
1018 /* Hardware error interrupts can be deferred */
1019 if (unlikely(sti
&& (fp
->seqstat
& SEQSTAT_EXCAUSE
) == VEC_HWERR
&&
1021 verbose_printk(KERN_NOTICE
"Looks like this was a deferred error - sorry\n");
1022 #ifndef CONFIG_DEBUG_HWERR
1023 verbose_printk(KERN_NOTICE
"The remaining message may be meaningless\n"
1024 KERN_NOTICE
"You should enable CONFIG_DEBUG_HWERR to get a"
1025 " better idea where it came from\n");
1027 /* If we are handling only one peripheral interrupt
1028 * and current mm and pid are valid, and the last error
1029 * was in that user space process's text area
1030 * print it out - because that is where the problem exists
1032 if ((!(((fp
)->ipend
& ~0x30) & (((fp
)->ipend
& ~0x30) - 1))) &&
1033 (current
->pid
&& current
->mm
)) {
1034 /* And the last RETI points to the current userspace context */
1035 if ((fp
+ 1)->pc
>= current
->mm
->start_code
&&
1036 (fp
+ 1)->pc
<= current
->mm
->end_code
) {
1037 verbose_printk(KERN_NOTICE
"It might be better to look around here : \n");
1038 verbose_printk(KERN_NOTICE
"-------------------------------------------\n");
1040 verbose_printk(KERN_NOTICE
"-------------------------------------------\n");
1048 void show_regs(struct pt_regs
*fp
)
1050 #ifdef CONFIG_DEBUG_VERBOSE
1052 struct irqaction
*action
;
1054 unsigned long flags
;
1055 unsigned int cpu
= smp_processor_id();
1057 verbose_printk(KERN_NOTICE
"\n" KERN_NOTICE
"SEQUENCER STATUS:\t\t%s\n", print_tainted());
1058 verbose_printk(KERN_NOTICE
" SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
1059 (long)fp
->seqstat
, fp
->ipend
, fp
->syscfg
);
1060 if ((fp
->seqstat
& SEQSTAT_EXCAUSE
) == VEC_HWERR
) {
1061 verbose_printk(KERN_NOTICE
" HWERRCAUSE: 0x%lx\n",
1062 (fp
->seqstat
& SEQSTAT_HWERRCAUSE
) >> 14);
1064 /* If the error was from the EBIU, print it out */
1065 if (bfin_read_EBIU_ERRMST() & CORE_ERROR
) {
1066 verbose_printk(KERN_NOTICE
" EBIU Error Reason : 0x%04x\n",
1067 bfin_read_EBIU_ERRMST());
1068 verbose_printk(KERN_NOTICE
" EBIU Error Address : 0x%08x\n",
1069 bfin_read_EBIU_ERRADD());
1073 verbose_printk(KERN_NOTICE
" EXCAUSE : 0x%lx\n",
1074 fp
->seqstat
& SEQSTAT_EXCAUSE
);
1075 for (i
= 6; i
<= 15 ; i
++) {
1076 if (fp
->ipend
& (1 << i
)) {
1077 decode_address(buf
, bfin_read32(EVT0
+ 4*i
));
1078 verbose_printk(KERN_NOTICE
" physical IVG%i asserted : %s\n", i
, buf
);
1082 /* if no interrupts are going off, don't print this out */
1083 if (fp
->ipend
& ~0x3F) {
1084 for (i
= 0; i
< (NR_IRQS
- 1); i
++) {
1085 spin_lock_irqsave(&irq_desc
[i
].lock
, flags
);
1086 action
= irq_desc
[i
].action
;
1090 decode_address(buf
, (unsigned int)action
->handler
);
1091 verbose_printk(KERN_NOTICE
" logical irq %3d mapped : %s", i
, buf
);
1092 for (action
= action
->next
; action
; action
= action
->next
) {
1093 decode_address(buf
, (unsigned int)action
->handler
);
1094 verbose_printk(", %s", buf
);
1096 verbose_printk("\n");
1098 spin_unlock_irqrestore(&irq_desc
[i
].lock
, flags
);
1102 decode_address(buf
, fp
->rete
);
1103 verbose_printk(KERN_NOTICE
" RETE: %s\n", buf
);
1104 decode_address(buf
, fp
->retn
);
1105 verbose_printk(KERN_NOTICE
" RETN: %s\n", buf
);
1106 decode_address(buf
, fp
->retx
);
1107 verbose_printk(KERN_NOTICE
" RETX: %s\n", buf
);
1108 decode_address(buf
, fp
->rets
);
1109 verbose_printk(KERN_NOTICE
" RETS: %s\n", buf
);
1110 decode_address(buf
, fp
->pc
);
1111 verbose_printk(KERN_NOTICE
" PC : %s\n", buf
);
1113 if (((long)fp
->seqstat
& SEQSTAT_EXCAUSE
) &&
1114 (((long)fp
->seqstat
& SEQSTAT_EXCAUSE
) != VEC_HWERR
)) {
1115 decode_address(buf
, cpu_pda
[cpu
].dcplb_fault_addr
);
1116 verbose_printk(KERN_NOTICE
"DCPLB_FAULT_ADDR: %s\n", buf
);
1117 decode_address(buf
, cpu_pda
[cpu
].icplb_fault_addr
);
1118 verbose_printk(KERN_NOTICE
"ICPLB_FAULT_ADDR: %s\n", buf
);
1121 verbose_printk(KERN_NOTICE
"\n" KERN_NOTICE
"PROCESSOR STATE:\n");
1122 verbose_printk(KERN_NOTICE
" R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
1123 fp
->r0
, fp
->r1
, fp
->r2
, fp
->r3
);
1124 verbose_printk(KERN_NOTICE
" R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
1125 fp
->r4
, fp
->r5
, fp
->r6
, fp
->r7
);
1126 verbose_printk(KERN_NOTICE
" P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
1127 fp
->p0
, fp
->p1
, fp
->p2
, fp
->p3
);
1128 verbose_printk(KERN_NOTICE
" P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
1129 fp
->p4
, fp
->p5
, fp
->fp
, (long)fp
);
1130 verbose_printk(KERN_NOTICE
" LB0: %08lx LT0: %08lx LC0: %08lx\n",
1131 fp
->lb0
, fp
->lt0
, fp
->lc0
);
1132 verbose_printk(KERN_NOTICE
" LB1: %08lx LT1: %08lx LC1: %08lx\n",
1133 fp
->lb1
, fp
->lt1
, fp
->lc1
);
1134 verbose_printk(KERN_NOTICE
" B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
1135 fp
->b0
, fp
->l0
, fp
->m0
, fp
->i0
);
1136 verbose_printk(KERN_NOTICE
" B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
1137 fp
->b1
, fp
->l1
, fp
->m1
, fp
->i1
);
1138 verbose_printk(KERN_NOTICE
" B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
1139 fp
->b2
, fp
->l2
, fp
->m2
, fp
->i2
);
1140 verbose_printk(KERN_NOTICE
" B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
1141 fp
->b3
, fp
->l3
, fp
->m3
, fp
->i3
);
1142 verbose_printk(KERN_NOTICE
"A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
1143 fp
->a0w
, fp
->a0x
, fp
->a1w
, fp
->a1x
);
1145 verbose_printk(KERN_NOTICE
"USP : %08lx ASTAT: %08lx\n",
1146 rdusp(), fp
->astat
);
1148 verbose_printk(KERN_NOTICE
"\n");
1152 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1153 asmlinkage
int sys_bfin_spinlock(int *spinlock
)__attribute__((l1_text
));
1156 static DEFINE_SPINLOCK(bfin_spinlock_lock
);
1158 asmlinkage
int sys_bfin_spinlock(int *p
)
1162 spin_lock(&bfin_spinlock_lock
); /* This would also hold kernel preemption. */
1163 ret
= get_user(tmp
, p
);
1164 if (likely(ret
== 0)) {
1170 spin_unlock(&bfin_spinlock_lock
);
1174 int bfin_request_exception(unsigned int exception
, void (*handler
)(void))
1176 void (*curr_handler
)(void);
1178 if (exception
> 0x3F)
1181 curr_handler
= ex_table
[exception
];
1183 if (curr_handler
!= ex_replaceable
)
1186 ex_table
[exception
] = handler
;
1190 EXPORT_SYMBOL(bfin_request_exception
);
1192 int bfin_free_exception(unsigned int exception
, void (*handler
)(void))
1194 void (*curr_handler
)(void);
1196 if (exception
> 0x3F)
1199 curr_handler
= ex_table
[exception
];
1201 if (curr_handler
!= handler
)
1204 ex_table
[exception
] = ex_replaceable
;
1208 EXPORT_SYMBOL(bfin_free_exception
);
1210 void panic_cplb_error(int cplb_panic
, struct pt_regs
*fp
)
1212 switch (cplb_panic
) {
1213 case CPLB_NO_UNLOCKED
:
1214 printk(KERN_EMERG
"All CPLBs are locked\n");
1216 case CPLB_PROT_VIOL
:
1218 case CPLB_NO_ADDR_MATCH
:
1220 case CPLB_UNKNOWN_ERR
:
1221 printk(KERN_EMERG
"Unknown CPLB Exception\n");
1225 oops_in_progress
= 1;
1227 dump_bfin_process(fp
);
1231 panic("Unrecoverable event\n");