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() do { CHK_DEBUGGER(trapnr, sig, info.si_code, fp,); } while (0)
152 # define CHK_DEBUGGER_TRAP_MAYBE() do { if (kgdb_connected) CHK_DEBUGGER_TRAP(); } while (0)
154 # define CHK_DEBUGGER_TRAP() do { } while (0)
155 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
158 trace_buffer_save(j
);
160 /* trap_c() will be called for exceptions. During exceptions
161 * processing, the pc value should be set with retx value.
162 * With this change we can cleanup some code in signal.c- TODO
164 fp
->orig_pc
= fp
->retx
;
165 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
166 trapnr, fp->ipend, fp->pc, fp->retx); */
168 /* send the appropriate signal to the user program */
171 /* This table works in conjuction with the one in ./mach-common/entry.S
172 * Some exceptions are handled there (in assembly, in exception space)
173 * Some are handled here, (in C, in interrupt space)
174 * Some, like CPLB, are handled in both, where the normal path is
175 * handled in assembly/exception space, and the error path is handled
179 /* 0x00 - Linux Syscall, getting here is an error */
180 /* 0x01 - userspace gdb breakpoint, handled here */
182 info
.si_code
= TRAP_ILLTRAP
;
184 CHK_DEBUGGER_TRAP_MAYBE();
185 /* Check if this is a breakpoint in kernel space */
186 if (fp
->ipend
& 0xffc0)
191 case VEC_EXCPT02
: /* gdb connection */
192 info
.si_code
= TRAP_ILLTRAP
;
197 /* 0x02 - User Defined, Caught by default */
199 /* 0x03 - Atomic test and set */
201 info
.si_code
= SEGV_STACKFLOW
;
203 printk(KERN_EMERG EXC_0x03
);
206 /* 0x04 - spinlock - handled by _ex_spinlock,
207 getting here is an error */
208 /* 0x05 - User Defined, Caught by default */
209 /* 0x06 - User Defined, Caught by default */
210 /* 0x07 - User Defined, Caught by default */
211 /* 0x08 - User Defined, Caught by default */
212 /* 0x09 - User Defined, Caught by default */
213 /* 0x0A - User Defined, Caught by default */
214 /* 0x0B - User Defined, Caught by default */
215 /* 0x0C - User Defined, Caught by default */
216 /* 0x0D - User Defined, Caught by default */
217 /* 0x0E - User Defined, Caught by default */
218 /* 0x0F - User Defined, Caught by default */
219 /* 0x10 HW Single step, handled here */
221 info
.si_code
= TRAP_STEP
;
223 CHK_DEBUGGER_TRAP_MAYBE();
224 /* Check if this is a single step in kernel space */
225 if (fp
->ipend
& 0xffc0)
229 /* 0x11 - Trace Buffer Full, handled here */
231 info
.si_code
= TRAP_TRACEFLOW
;
233 printk(KERN_EMERG EXC_0x11
);
236 /* 0x12 - Reserved, Caught by default */
237 /* 0x13 - Reserved, Caught by default */
238 /* 0x14 - Reserved, Caught by default */
239 /* 0x15 - Reserved, Caught by default */
240 /* 0x16 - Reserved, Caught by default */
241 /* 0x17 - Reserved, Caught by default */
242 /* 0x18 - Reserved, Caught by default */
243 /* 0x19 - Reserved, Caught by default */
244 /* 0x1A - Reserved, Caught by default */
245 /* 0x1B - Reserved, Caught by default */
246 /* 0x1C - Reserved, Caught by default */
247 /* 0x1D - Reserved, Caught by default */
248 /* 0x1E - Reserved, Caught by default */
249 /* 0x1F - Reserved, Caught by default */
250 /* 0x20 - Reserved, Caught by default */
251 /* 0x21 - Undefined Instruction, handled here */
253 info
.si_code
= ILL_ILLOPC
;
255 printk(KERN_EMERG EXC_0x21
);
258 /* 0x22 - Illegal Instruction Combination, handled here */
260 info
.si_code
= ILL_ILLPARAOP
;
262 printk(KERN_EMERG EXC_0x22
);
265 /* 0x23 - Data CPLB Protection Violation,
266 normal case is handled in _cplb_hdr */
268 info
.si_code
= ILL_CPLB_VI
;
270 printk(KERN_EMERG EXC_0x23
);
273 /* 0x24 - Data access misaligned, handled here */
275 info
.si_code
= BUS_ADRALN
;
277 printk(KERN_EMERG EXC_0x24
);
280 /* 0x25 - Unrecoverable Event, handled here */
282 info
.si_code
= ILL_ILLEXCPT
;
284 printk(KERN_EMERG EXC_0x25
);
287 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
288 error case is handled here */
290 info
.si_code
= BUS_ADRALN
;
292 printk(KERN_EMERG EXC_0x26
);
295 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
297 info
.si_code
= ILL_CPLB_MULHIT
;
298 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
300 printk(KERN_EMERG
"\n\nNULL pointer access (probably)\n");
303 printk(KERN_EMERG EXC_0x27
);
307 /* 0x28 - Emulation Watchpoint, handled here */
309 info
.si_code
= TRAP_WATCHPT
;
312 CHK_DEBUGGER_TRAP_MAYBE();
313 /* Check if this is a watchpoint in kernel space */
314 if (fp
->ipend
& 0xffc0)
319 /* 0x29 - Instruction fetch access error (535 only) */
320 case VEC_ISTRU_VL
: /* ADSP-BF535 only (MH) */
321 info
.si_code
= BUS_OPFETCH
;
323 printk(KERN_EMERG
"BF535: VEC_ISTRU_VL\n");
327 /* 0x29 - Reserved, Caught by default */
329 /* 0x2A - Instruction fetch misaligned, handled here */
331 info
.si_code
= BUS_ADRALN
;
333 printk(KERN_EMERG EXC_0x2A
);
336 /* 0x2B - Instruction CPLB protection Violation,
337 handled in _cplb_hdr */
339 info
.si_code
= ILL_CPLB_VI
;
341 printk(KERN_EMERG EXC_0x2B
);
344 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
346 info
.si_code
= ILL_CPLB_MISS
;
348 printk(KERN_EMERG EXC_0x2C
);
351 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
352 case VEC_CPLB_I_MHIT
:
353 info
.si_code
= ILL_CPLB_MULHIT
;
354 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
356 printk(KERN_EMERG
"\n\nJump to address 0 - 0x0fff\n");
359 printk(KERN_EMERG EXC_0x2D
);
363 /* 0x2E - Illegal use of Supervisor Resource, handled here */
365 info
.si_code
= ILL_PRVOPC
;
367 printk(KERN_EMERG EXC_0x2E
);
370 /* 0x2F - Reserved, Caught by default */
371 /* 0x30 - Reserved, Caught by default */
372 /* 0x31 - Reserved, Caught by default */
373 /* 0x32 - Reserved, Caught by default */
374 /* 0x33 - Reserved, Caught by default */
375 /* 0x34 - Reserved, Caught by default */
376 /* 0x35 - Reserved, Caught by default */
377 /* 0x36 - Reserved, Caught by default */
378 /* 0x37 - Reserved, Caught by default */
379 /* 0x38 - Reserved, Caught by default */
380 /* 0x39 - Reserved, Caught by default */
381 /* 0x3A - Reserved, Caught by default */
382 /* 0x3B - Reserved, Caught by default */
383 /* 0x3C - Reserved, Caught by default */
384 /* 0x3D - Reserved, Caught by default */
385 /* 0x3E - Reserved, Caught by default */
386 /* 0x3F - Reserved, Caught by default */
388 info
.si_code
= TRAP_ILLTRAP
;
390 printk(KERN_EMERG
"Caught Unhandled Exception, code = %08lx\n",
391 (fp
->seqstat
& SEQSTAT_EXCAUSE
));
398 info
.si_addr
= (void *)fp
->pc
;
399 force_sig_info(sig
, &info
, current
);
400 if (sig
!= 0 && sig
!= SIGTRAP
) {
402 dump_bfin_regs(fp
, (void *)fp
->retx
);
403 dump_bfin_trace_buffer();
404 show_stack(current
, &stack
);
405 if (current
->mm
== NULL
)
406 panic("Kernel exception");
409 /* if the address that we are about to return to is not valid, set it
410 * to a valid address, if we have a current application or panic
412 if (!(fp
->pc
<= physical_mem_end
413 #if L1_CODE_LENGTH != 0
414 || (fp
->pc
>= L1_CODE_START
&&
415 fp
->pc
<= (L1_CODE_START
+ L1_CODE_LENGTH
))
419 fp
->pc
= current
->mm
->start_code
;
421 printk(KERN_EMERG
"I can't return to memory that doesn't exist - bad things happen\n");
422 panic("Help - I've fallen and can't get up\n");
426 trace_buffer_restore(j
);
430 /* Typical exception handling routines */
432 void dump_bfin_trace_buffer(void)
435 trace_buffer_save(tflags
);
437 if (likely(bfin_read_TBUFSTAT() & TBUFCNT
)) {
439 printk(KERN_EMERG
"Hardware Trace:\n");
440 for (i
= 0; bfin_read_TBUFSTAT() & TBUFCNT
; i
++) {
441 printk(KERN_EMERG
"%2i Target : ", i
);
442 printk_address((unsigned long)bfin_read_TBUF());
443 printk("\n" KERN_EMERG
" Source : ");
444 printk_address((unsigned long)bfin_read_TBUF());
449 trace_buffer_restore(tflags
);
451 EXPORT_SYMBOL(dump_bfin_trace_buffer
);
453 static void show_trace(struct task_struct
*tsk
, unsigned long *sp
)
457 printk("\nCall Trace:");
458 #ifdef CONFIG_KALLSYMS
462 while (!kstack_end(sp
)) {
465 * If the address is either in the text segment of the
466 * kernel, or in the region which contains vmalloc'ed
467 * memory, it *may* be the address of a calling
468 * routine; if so, print it so that someone tracing
469 * down the cause of the crash will be able to figure
470 * out the call path that was taken.
472 if (kernel_text_address(addr
))
479 void show_stack(struct task_struct
*task
, unsigned long *stack
)
481 unsigned long *endstack
, addr
;
484 /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
485 * called externally in some places in the kernel.
490 stack
= (unsigned long *)task
->thread
.ksp
;
492 stack
= (unsigned long *)&stack
;
495 addr
= (unsigned long)stack
;
496 endstack
= (unsigned long *)PAGE_ALIGN(addr
);
498 printk(KERN_EMERG
"Stack from %08lx:", (unsigned long)stack
);
499 for (i
= 0; i
< kstack_depth_to_print
; i
++) {
500 if (stack
+ 1 > endstack
)
503 printk("\n" KERN_EMERG
" ");
504 printk(" %08lx", *stack
++);
507 show_trace(task
, stack
);
510 void dump_stack(void)
514 trace_buffer_save(tflags
);
515 dump_bfin_trace_buffer();
516 show_stack(current
, &stack
);
517 trace_buffer_restore(tflags
);
520 EXPORT_SYMBOL(dump_stack
);
522 void dump_bfin_regs(struct pt_regs
*fp
, void *retaddr
)
525 printk("\nCURRENT PROCESS:\n\n");
526 printk("COMM=%s PID=%d\n", current
->comm
, current
->pid
);
529 ("\nNo Valid pid - Either things are really messed up, or you are in the kernel\n");
533 printk("TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
534 "BSS = 0x%p-0x%p USER-STACK = 0x%p\n\n",
535 (void*)current
->mm
->start_code
,
536 (void*)current
->mm
->end_code
,
537 (void*)current
->mm
->start_data
,
538 (void*)current
->mm
->end_data
,
539 (void*)current
->mm
->end_data
,
540 (void*)current
->mm
->brk
,
541 (void*)current
->mm
->start_stack
);
544 printk("return address: 0x%p; contents of [PC-16...PC+8]:\n", retaddr
);
545 if (retaddr
!= 0 && retaddr
<= (void*)physical_mem_end
546 #if L1_CODE_LENGTH != 0
547 /* FIXME: Copy the code out of L1 Instruction SRAM through dma
549 && !(retaddr
>= (void*)L1_CODE_START
550 && retaddr
< (void*)(L1_CODE_START
+ L1_CODE_LENGTH
))
554 unsigned short x
= 0;
555 for (i
= -16; i
< 8; i
++) {
556 if (get_user(x
, (unsigned short *)retaddr
+ i
))
558 #ifndef CONFIG_DEBUG_HWERR
559 /* If one of the last few instructions was a STI
560 * it is likely that the error occured awhile ago
561 * and we just noticed
563 if (x
>= 0x0040 && x
<= 0x0047 && i
<= 0)
564 panic("\n\nWARNING : You should reconfigure the kernel to turn on\n"
565 " 'Hardware error interrupt debugging'\n"
566 " The rest of this error is meanless\n");
576 printk("Cannot look at the [PC] for it is in unreadable L1 SRAM - sorry\n");
580 printk("RETE: %08lx RETN: %08lx RETX: %08lx RETS: %08lx\n",
581 fp
->rete
, fp
->retn
, fp
->retx
, fp
->rets
);
582 printk("IPEND: %04lx SYSCFG: %04lx\n", fp
->ipend
, fp
->syscfg
);
583 printk("SEQSTAT: %08lx SP: %08lx\n", (long)fp
->seqstat
, (long)fp
);
584 printk("R0: %08lx R1: %08lx R2: %08lx R3: %08lx\n",
585 fp
->r0
, fp
->r1
, fp
->r2
, fp
->r3
);
586 printk("R4: %08lx R5: %08lx R6: %08lx R7: %08lx\n",
587 fp
->r4
, fp
->r5
, fp
->r6
, fp
->r7
);
588 printk("P0: %08lx P1: %08lx P2: %08lx P3: %08lx\n",
589 fp
->p0
, fp
->p1
, fp
->p2
, fp
->p3
);
590 printk("P4: %08lx P5: %08lx FP: %08lx\n", fp
->p4
, fp
->p5
, fp
->fp
);
591 printk("A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
592 fp
->a0w
, fp
->a0x
, fp
->a1w
, fp
->a1x
);
594 printk("LB0: %08lx LT0: %08lx LC0: %08lx\n", fp
->lb0
, fp
->lt0
,
596 printk("LB1: %08lx LT1: %08lx LC1: %08lx\n", fp
->lb1
, fp
->lt1
,
598 printk("B0: %08lx L0: %08lx M0: %08lx I0: %08lx\n", fp
->b0
, fp
->l0
,
600 printk("B1: %08lx L1: %08lx M1: %08lx I1: %08lx\n", fp
->b1
, fp
->l1
,
602 printk("B2: %08lx L2: %08lx M2: %08lx I2: %08lx\n", fp
->b2
, fp
->l2
,
604 printk("B3: %08lx L3: %08lx M3: %08lx I3: %08lx\n", fp
->b3
, fp
->l3
,
607 printk("\nUSP: %08lx ASTAT: %08lx\n", rdusp(), fp
->astat
);
608 if ((long)fp
->seqstat
& SEQSTAT_EXCAUSE
) {
609 printk(KERN_EMERG
"DCPLB_FAULT_ADDR=%p\n", (void*)bfin_read_DCPLB_FAULT_ADDR());
610 printk(KERN_EMERG
"ICPLB_FAULT_ADDR=%p\n", (void*)bfin_read_ICPLB_FAULT_ADDR());
616 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
617 asmlinkage
int sys_bfin_spinlock(int *spinlock
)__attribute__((l1_text
));
620 asmlinkage
int sys_bfin_spinlock(int *spinlock
)
626 ret
= get_user(tmp
, spinlock
);
631 put_user(tmp
, spinlock
);
637 void panic_cplb_error(int cplb_panic
, struct pt_regs
*fp
)
639 switch (cplb_panic
) {
640 case CPLB_NO_UNLOCKED
:
641 printk(KERN_EMERG
"All CPLBs are locked\n");
645 case CPLB_NO_ADDR_MATCH
:
647 case CPLB_UNKNOWN_ERR
:
648 printk(KERN_EMERG
"Unknown CPLB Exception\n");
652 printk(KERN_EMERG
"DCPLB_FAULT_ADDR=%p\n", (void*)bfin_read_DCPLB_FAULT_ADDR());
653 printk(KERN_EMERG
"ICPLB_FAULT_ADDR=%p\n", (void*)bfin_read_ICPLB_FAULT_ADDR());
654 dump_bfin_regs(fp
, (void *)fp
->retx
);
656 panic("Unrecoverable event\n");