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 <asm/uaccess.h>
31 #include <asm/traps.h>
32 #include <asm/cacheflush.h>
33 #include <asm/blackfin.h>
34 #include <asm/uaccess.h>
35 #include <asm/irq_handler.h>
36 #include <linux/interrupt.h>
37 #include <linux/module.h>
38 #include <linux/kallsyms.h>
41 # include <linux/debugger.h>
42 # include <linux/kgdb.h>
45 /* Initiate the event table handler */
46 void __init
trap_init(void)
49 bfin_write_EVT3(trap
);
53 asmlinkage
void trap_c(struct pt_regs
*fp
);
55 int kstack_depth_to_print
= 48;
57 static int printk_address(unsigned long address
)
59 struct vm_list_struct
*vml
;
60 struct task_struct
*p
;
64 #ifdef CONFIG_KALLSYMS
65 unsigned long symsize
;
71 /* look up the address and see if we are in kernel space */
72 symname
= kallsyms_lookup(address
, &symsize
, &offset
, &modname
, namebuf
);
75 /* yeah! kernel space! */
78 return printk("<0x%p> { %s%s%s%s + 0x%lx }",
79 (void*)address
, delim
, modname
, delim
, symname
,
80 (unsigned long)offset
);
85 /* looks like we're off in user-land, so let's walk all the
86 * mappings of all our processes and see if we can't be a whee
89 write_lock_irq(&tasklist_lock
);
95 vml
= mm
->context
.vmlist
;
97 struct vm_area_struct
*vma
= vml
->vma
;
99 if (address
>= vma
->vm_start
&& address
< vma
->vm_end
) {
100 char *name
= p
->comm
;
101 struct file
*file
= vma
->vm_file
;
104 name
= d_path(file
->f_dentry
,
110 /* FLAT does not have its text aligned to the start of
111 * the map while FDPIC ELF does ...
114 (address
> current
->mm
->start_code
) &&
115 (address
< current
->mm
->end_code
))
116 offset
= address
- current
->mm
->start_code
;
118 offset
= (address
- vma
->vm_start
) + (vma
->vm_pgoff
<< PAGE_SHIFT
);
120 write_unlock_irq(&tasklist_lock
);
121 return printk("<0x%p> [ %s + 0x%lx ]",
122 (void*)address
, name
, offset
);
128 write_unlock_irq(&tasklist_lock
);
130 /* we were unable to find this address anywhere */
131 return printk("[<0x%p>]", (void*)address
);
134 #define trace_buffer_save(x) \
136 (x) = bfin_read_TBUFCTL(); \
137 bfin_write_TBUFCTL((x) & ~TBUFEN); \
139 #define trace_buffer_restore(x) \
141 bfin_write_TBUFCTL((x)); \
144 asmlinkage
void trap_c(struct pt_regs
*fp
)
148 unsigned long trapnr
= fp
->seqstat
& SEQSTAT_EXCAUSE
;
151 # define CHK_DEBUGGER_TRAP() \
153 CHK_DEBUGGER(trapnr, sig, info.si_code, fp); \
155 # define CHK_DEBUGGER_TRAP_MAYBE() \
157 if (kgdb_connected) \
158 CHK_DEBUGGER_TRAP(); \
161 # define CHK_DEBUGGER_TRAP() do { } while (0)
162 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
165 trace_buffer_save(j
);
167 /* trap_c() will be called for exceptions. During exceptions
168 * processing, the pc value should be set with retx value.
169 * With this change we can cleanup some code in signal.c- TODO
171 fp
->orig_pc
= fp
->retx
;
172 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
173 trapnr, fp->ipend, fp->pc, fp->retx); */
175 /* send the appropriate signal to the user program */
178 /* This table works in conjuction with the one in ./mach-common/entry.S
179 * Some exceptions are handled there (in assembly, in exception space)
180 * Some are handled here, (in C, in interrupt space)
181 * Some, like CPLB, are handled in both, where the normal path is
182 * handled in assembly/exception space, and the error path is handled
186 /* 0x00 - Linux Syscall, getting here is an error */
187 /* 0x01 - userspace gdb breakpoint, handled here */
189 info
.si_code
= TRAP_ILLTRAP
;
191 CHK_DEBUGGER_TRAP_MAYBE();
192 /* Check if this is a breakpoint in kernel space */
193 if (fp
->ipend
& 0xffc0)
198 case VEC_EXCPT02
: /* gdb connection */
199 info
.si_code
= TRAP_ILLTRAP
;
204 /* 0x02 - User Defined, Caught by default */
206 /* 0x03 - Atomic test and set */
208 info
.si_code
= SEGV_STACKFLOW
;
210 printk(KERN_EMERG EXC_0x03
);
213 /* 0x04 - spinlock - handled by _ex_spinlock,
214 getting here is an error */
215 /* 0x05 - User Defined, Caught by default */
216 /* 0x06 - User Defined, Caught by default */
217 /* 0x07 - User Defined, Caught by default */
218 /* 0x08 - User Defined, Caught by default */
219 /* 0x09 - User Defined, Caught by default */
220 /* 0x0A - User Defined, Caught by default */
221 /* 0x0B - User Defined, Caught by default */
222 /* 0x0C - User Defined, Caught by default */
223 /* 0x0D - User Defined, Caught by default */
224 /* 0x0E - User Defined, Caught by default */
225 /* 0x0F - User Defined, Caught by default */
226 /* 0x10 HW Single step, handled here */
228 info
.si_code
= TRAP_STEP
;
230 CHK_DEBUGGER_TRAP_MAYBE();
231 /* Check if this is a single step in kernel space */
232 if (fp
->ipend
& 0xffc0)
236 /* 0x11 - Trace Buffer Full, handled here */
238 info
.si_code
= TRAP_TRACEFLOW
;
240 printk(KERN_EMERG EXC_0x11
);
243 /* 0x12 - Reserved, Caught by default */
244 /* 0x13 - Reserved, Caught by default */
245 /* 0x14 - Reserved, Caught by default */
246 /* 0x15 - Reserved, Caught by default */
247 /* 0x16 - Reserved, Caught by default */
248 /* 0x17 - Reserved, Caught by default */
249 /* 0x18 - Reserved, Caught by default */
250 /* 0x19 - Reserved, Caught by default */
251 /* 0x1A - Reserved, Caught by default */
252 /* 0x1B - Reserved, Caught by default */
253 /* 0x1C - Reserved, Caught by default */
254 /* 0x1D - Reserved, Caught by default */
255 /* 0x1E - Reserved, Caught by default */
256 /* 0x1F - Reserved, Caught by default */
257 /* 0x20 - Reserved, Caught by default */
258 /* 0x21 - Undefined Instruction, handled here */
260 info
.si_code
= ILL_ILLOPC
;
262 printk(KERN_EMERG EXC_0x21
);
265 /* 0x22 - Illegal Instruction Combination, handled here */
267 info
.si_code
= ILL_ILLPARAOP
;
269 printk(KERN_EMERG EXC_0x22
);
272 /* 0x23 - Data CPLB Protection Violation,
273 normal case is handled in _cplb_hdr */
275 info
.si_code
= ILL_CPLB_VI
;
277 printk(KERN_EMERG EXC_0x23
);
280 /* 0x24 - Data access misaligned, handled here */
282 info
.si_code
= BUS_ADRALN
;
284 printk(KERN_EMERG EXC_0x24
);
287 /* 0x25 - Unrecoverable Event, handled here */
289 info
.si_code
= ILL_ILLEXCPT
;
291 printk(KERN_EMERG EXC_0x25
);
294 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
295 error case is handled here */
297 info
.si_code
= BUS_ADRALN
;
299 printk(KERN_EMERG EXC_0x26
);
302 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
304 info
.si_code
= ILL_CPLB_MULHIT
;
305 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
307 printk(KERN_EMERG
"\n"
308 KERN_EMERG
"NULL pointer access (probably)\n");
311 printk(KERN_EMERG EXC_0x27
);
315 /* 0x28 - Emulation Watchpoint, handled here */
317 info
.si_code
= TRAP_WATCHPT
;
320 CHK_DEBUGGER_TRAP_MAYBE();
321 /* Check if this is a watchpoint in kernel space */
322 if (fp
->ipend
& 0xffc0)
327 /* 0x29 - Instruction fetch access error (535 only) */
328 case VEC_ISTRU_VL
: /* ADSP-BF535 only (MH) */
329 info
.si_code
= BUS_OPFETCH
;
331 printk(KERN_EMERG
"BF535: VEC_ISTRU_VL\n");
335 /* 0x29 - Reserved, Caught by default */
337 /* 0x2A - Instruction fetch misaligned, handled here */
339 info
.si_code
= BUS_ADRALN
;
341 printk(KERN_EMERG EXC_0x2A
);
344 /* 0x2B - Instruction CPLB protection Violation,
345 handled in _cplb_hdr */
347 info
.si_code
= ILL_CPLB_VI
;
349 printk(KERN_EMERG EXC_0x2B
);
352 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
354 info
.si_code
= ILL_CPLB_MISS
;
356 printk(KERN_EMERG EXC_0x2C
);
359 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
360 case VEC_CPLB_I_MHIT
:
361 info
.si_code
= ILL_CPLB_MULHIT
;
362 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
364 printk(KERN_EMERG
"\n\nJump to address 0 - 0x0fff\n");
367 printk(KERN_EMERG EXC_0x2D
);
371 /* 0x2E - Illegal use of Supervisor Resource, handled here */
373 info
.si_code
= ILL_PRVOPC
;
375 printk(KERN_EMERG EXC_0x2E
);
378 /* 0x2F - Reserved, Caught by default */
379 /* 0x30 - Reserved, Caught by default */
380 /* 0x31 - Reserved, Caught by default */
381 /* 0x32 - Reserved, Caught by default */
382 /* 0x33 - Reserved, Caught by default */
383 /* 0x34 - Reserved, Caught by default */
384 /* 0x35 - Reserved, Caught by default */
385 /* 0x36 - Reserved, Caught by default */
386 /* 0x37 - Reserved, Caught by default */
387 /* 0x38 - Reserved, Caught by default */
388 /* 0x39 - Reserved, Caught by default */
389 /* 0x3A - Reserved, Caught by default */
390 /* 0x3B - Reserved, Caught by default */
391 /* 0x3C - Reserved, Caught by default */
392 /* 0x3D - Reserved, Caught by default */
393 /* 0x3E - Reserved, Caught by default */
394 /* 0x3F - Reserved, Caught by default */
396 info
.si_code
= TRAP_ILLTRAP
;
398 printk(KERN_EMERG
"Caught Unhandled Exception, code = %08lx\n",
399 (fp
->seqstat
& SEQSTAT_EXCAUSE
));
406 info
.si_addr
= (void *)fp
->pc
;
407 force_sig_info(sig
, &info
, current
);
408 if (sig
!= 0 && sig
!= SIGTRAP
) {
410 dump_bfin_regs(fp
, (void *)fp
->retx
);
411 dump_bfin_trace_buffer();
412 show_stack(current
, &stack
);
413 if (current
->mm
== NULL
)
414 panic("Kernel exception");
417 /* if the address that we are about to return to is not valid, set it
418 * to a valid address, if we have a current application or panic
420 if (!(fp
->pc
<= physical_mem_end
421 #if L1_CODE_LENGTH != 0
422 || (fp
->pc
>= L1_CODE_START
&&
423 fp
->pc
<= (L1_CODE_START
+ L1_CODE_LENGTH
))
427 fp
->pc
= current
->mm
->start_code
;
430 "I can't return to memory that doesn't exist"
431 " - bad things happen\n");
432 panic("Help - I've fallen and can't get up\n");
436 trace_buffer_restore(j
);
440 /* Typical exception handling routines */
442 void dump_bfin_trace_buffer(void)
445 trace_buffer_save(tflags
);
447 if (likely(bfin_read_TBUFSTAT() & TBUFCNT
)) {
449 printk(KERN_EMERG
"Hardware Trace:\n");
450 for (i
= 0; bfin_read_TBUFSTAT() & TBUFCNT
; i
++) {
451 printk(KERN_EMERG
"%2i Target : ", i
);
452 printk_address((unsigned long)bfin_read_TBUF());
453 printk("\n" KERN_EMERG
" Source : ");
454 printk_address((unsigned long)bfin_read_TBUF());
459 trace_buffer_restore(tflags
);
461 EXPORT_SYMBOL(dump_bfin_trace_buffer
);
463 static void show_trace(struct task_struct
*tsk
, unsigned long *sp
)
467 printk("\nCall Trace:");
468 #ifdef CONFIG_KALLSYMS
472 while (!kstack_end(sp
)) {
475 * If the address is either in the text segment of the
476 * kernel, or in the region which contains vmalloc'ed
477 * memory, it *may* be the address of a calling
478 * routine; if so, print it so that someone tracing
479 * down the cause of the crash will be able to figure
480 * out the call path that was taken.
482 if (kernel_text_address(addr
))
489 void show_stack(struct task_struct
*task
, unsigned long *stack
)
491 unsigned long *endstack
, addr
;
494 /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
495 * called externally in some places in the kernel.
500 stack
= (unsigned long *)task
->thread
.ksp
;
502 stack
= (unsigned long *)&stack
;
505 addr
= (unsigned long)stack
;
506 endstack
= (unsigned long *)PAGE_ALIGN(addr
);
508 printk(KERN_EMERG
"Stack from %08lx:", (unsigned long)stack
);
509 for (i
= 0; i
< kstack_depth_to_print
; i
++) {
510 if (stack
+ 1 > endstack
)
513 printk("\n" KERN_EMERG
" ");
514 printk(" %08lx", *stack
++);
517 show_trace(task
, stack
);
520 void dump_stack(void)
524 trace_buffer_save(tflags
);
525 dump_bfin_trace_buffer();
526 show_stack(current
, &stack
);
527 trace_buffer_restore(tflags
);
530 EXPORT_SYMBOL(dump_stack
);
532 void dump_bfin_regs(struct pt_regs
*fp
, void *retaddr
)
535 printk(KERN_EMERG
"\n" KERN_EMERG
"CURRENT PROCESS:\n"
537 printk(KERN_EMERG
"COMM=%s PID=%d\n",
538 current
->comm
, current
->pid
);
541 (KERN_EMERG
"\n" KERN_EMERG
542 "No Valid pid - Either things are really messed up,"
543 " or you are in the kernel\n");
547 printk(KERN_EMERG
"TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
548 KERN_EMERG
"BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
550 (void*)current
->mm
->start_code
,
551 (void*)current
->mm
->end_code
,
552 (void*)current
->mm
->start_data
,
553 (void*)current
->mm
->end_data
,
554 (void*)current
->mm
->end_data
,
555 (void*)current
->mm
->brk
,
556 (void*)current
->mm
->start_stack
);
559 printk(KERN_EMERG
"return address: [0x%p]; contents of:", retaddr
);
560 if (retaddr
!= 0 && retaddr
<= (void*)physical_mem_end
561 #if L1_CODE_LENGTH != 0
562 /* FIXME: Copy the code out of L1 Instruction SRAM through dma
564 && !(retaddr
>= (void*)L1_CODE_START
565 && retaddr
< (void*)(L1_CODE_START
+ L1_CODE_LENGTH
))
568 int i
= ((unsigned int)retaddr
& 0xFFFFFFF0) - 32;
569 unsigned short x
= 0;
570 for (; i
< ((unsigned int)retaddr
& 0xFFFFFFF0 ) + 32 ;
573 printk(KERN_EMERG
"\n" KERN_EMERG
576 if (get_user(x
, (unsigned short *)i
))
578 #ifndef CONFIG_DEBUG_HWERR
579 /* If one of the last few instructions was a STI
580 * it is likely that the error occured awhile ago
581 * and we just noticed
583 if (x
>= 0x0040 && x
<= 0x0047 && i
<= 0)
584 panic("\n\nWARNING : You should reconfigure"
585 " the kernel to turn on\n"
586 " 'Hardware error interrupt"
588 " The rest of this error"
591 if ( i
== (unsigned int)retaddr
)
596 printk("\n" KERN_EMERG
"\n");
599 "Cannot look at the [PC] for it is"
600 "in unreadable L1 SRAM - sorry\n");
604 "RETE: %08lx RETN: %08lx RETX: %08lx RETS: %08lx\n",
605 fp
->rete
, fp
->retn
, fp
->retx
, fp
->rets
);
606 printk(KERN_EMERG
"IPEND: %04lx SYSCFG: %04lx\n",
607 fp
->ipend
, fp
->syscfg
);
608 printk(KERN_EMERG
"SEQSTAT: %08lx SP: %08lx\n",
609 (long)fp
->seqstat
, (long)fp
);
610 printk(KERN_EMERG
"R0: %08lx R1: %08lx R2: %08lx R3: %08lx\n",
611 fp
->r0
, fp
->r1
, fp
->r2
, fp
->r3
);
612 printk(KERN_EMERG
"R4: %08lx R5: %08lx R6: %08lx R7: %08lx\n",
613 fp
->r4
, fp
->r5
, fp
->r6
, fp
->r7
);
614 printk(KERN_EMERG
"P0: %08lx P1: %08lx P2: %08lx P3: %08lx\n",
615 fp
->p0
, fp
->p1
, fp
->p2
, fp
->p3
);
617 "P4: %08lx P5: %08lx FP: %08lx\n",
618 fp
->p4
, fp
->p5
, fp
->fp
);
620 "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
621 fp
->a0w
, fp
->a0x
, fp
->a1w
, fp
->a1x
);
623 printk(KERN_EMERG
"LB0: %08lx LT0: %08lx LC0: %08lx\n",
624 fp
->lb0
, fp
->lt0
, fp
->lc0
);
625 printk(KERN_EMERG
"LB1: %08lx LT1: %08lx LC1: %08lx\n",
626 fp
->lb1
, fp
->lt1
, fp
->lc1
);
627 printk(KERN_EMERG
"B0: %08lx L0: %08lx M0: %08lx I0: %08lx\n",
628 fp
->b0
, fp
->l0
, fp
->m0
, fp
->i0
);
629 printk(KERN_EMERG
"B1: %08lx L1: %08lx M1: %08lx I1: %08lx\n",
630 fp
->b1
, fp
->l1
, fp
->m1
, fp
->i1
);
631 printk(KERN_EMERG
"B2: %08lx L2: %08lx M2: %08lx I2: %08lx\n",
632 fp
->b2
, fp
->l2
, fp
->m2
, fp
->i2
);
633 printk(KERN_EMERG
"B3: %08lx L3: %08lx M3: %08lx I3: %08lx\n",
634 fp
->b3
, fp
->l3
, fp
->m3
, fp
->i3
);
636 printk(KERN_EMERG
"\n" KERN_EMERG
"USP: %08lx ASTAT: %08lx\n",
638 if ((long)fp
->seqstat
& SEQSTAT_EXCAUSE
) {
639 printk(KERN_EMERG
"DCPLB_FAULT_ADDR=%p\n",
640 (void *)bfin_read_DCPLB_FAULT_ADDR());
641 printk(KERN_EMERG
"ICPLB_FAULT_ADDR=%p\n",
642 (void *)bfin_read_ICPLB_FAULT_ADDR());
648 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
649 asmlinkage
int sys_bfin_spinlock(int *spinlock
)__attribute__((l1_text
));
652 asmlinkage
int sys_bfin_spinlock(int *spinlock
)
658 ret
= get_user(tmp
, spinlock
);
663 put_user(tmp
, spinlock
);
669 void panic_cplb_error(int cplb_panic
, struct pt_regs
*fp
)
671 switch (cplb_panic
) {
672 case CPLB_NO_UNLOCKED
:
673 printk(KERN_EMERG
"All CPLBs are locked\n");
677 case CPLB_NO_ADDR_MATCH
:
679 case CPLB_UNKNOWN_ERR
:
680 printk(KERN_EMERG
"Unknown CPLB Exception\n");
684 printk(KERN_EMERG
"DCPLB_FAULT_ADDR=%p\n", (void*)bfin_read_DCPLB_FAULT_ADDR());
685 printk(KERN_EMERG
"ICPLB_FAULT_ADDR=%p\n", (void*)bfin_read_ICPLB_FAULT_ADDR());
686 dump_bfin_regs(fp
, (void *)fp
->retx
);
688 panic("Unrecoverable event\n");