2 * Copyright 2004-2009 Analog Devices Inc.
4 * Licensed under the GPL-2 or later
8 #include <linux/uaccess.h>
9 #include <linux/interrupt.h>
10 #include <linux/module.h>
11 #include <linux/kallsyms.h>
13 #include <linux/rbtree.h>
14 #include <asm/traps.h>
15 #include <asm/cacheflush.h>
18 #include <asm/blackfin.h>
19 #include <asm/irq_handler.h>
20 #include <linux/irq.h>
21 #include <asm/trace.h>
22 #include <asm/fixed_code.h>
25 # include <linux/kgdb.h>
27 # define CHK_DEBUGGER_TRAP() \
29 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
31 # define CHK_DEBUGGER_TRAP_MAYBE() \
34 CHK_DEBUGGER_TRAP(); \
37 # define CHK_DEBUGGER_TRAP() do { } while (0)
38 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
42 #ifdef CONFIG_DEBUG_VERBOSE
43 #define verbose_printk(fmt, arg...) \
46 #define verbose_printk(fmt, arg...) \
47 ({ if (0) printk(fmt, ##arg); 0; })
50 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
52 #ifdef CONFIG_DEBUG_MMRS_MODULE
53 EXPORT_SYMBOL(last_seqstat);
57 /* Initiate the event table handler */
58 void __init trap_init(void)
61 bfin_write_EVT3(trap);
65 static void decode_address(char *buf, unsigned long address)
67 #ifdef CONFIG_DEBUG_VERBOSE
68 struct task_struct *p;
70 unsigned long flags, offset;
71 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
74 #ifdef CONFIG_KALLSYMS
75 unsigned long symsize;
82 buf += sprintf(buf, "<0x%08lx> ", address);
84 #ifdef CONFIG_KALLSYMS
85 /* look up the address and see if we are in kernel space */
86 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
89 /* yeah! kernel space! */
92 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
93 delim, modname, delim, symname,
94 (unsigned long)offset);
99 if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
100 /* Problem in fixed code section? */
101 strcat(buf, "/* Maybe fixed code section */");
104 } else if (address < CONFIG_BOOT_LOAD) {
105 /* Problem somewhere before the kernel start address */
106 strcat(buf, "/* Maybe null pointer? */");
109 } else if (address >= COREMMR_BASE) {
110 strcat(buf, "/* core mmrs */");
113 } else if (address >= SYSMMR_BASE) {
114 strcat(buf, "/* system mmrs */");
117 } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
118 strcat(buf, "/* on-chip L1 ROM */");
122 /* looks like we're off in user-land, so let's walk all the
123 * mappings of all our processes and see if we can't be a whee
126 write_lock_irqsave(&tasklist_lock, flags);
127 for_each_process(p) {
128 mm = (in_atomic ? p->mm : get_task_mm(p));
132 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
133 struct vm_area_struct *vma;
135 vma = rb_entry(n, struct vm_area_struct, vm_rb);
137 if (address >= vma->vm_start && address < vma->vm_end) {
139 char *name = p->comm;
140 struct file *file = vma->vm_file;
143 char *d_name = d_path(&file->f_path, _tmpbuf,
149 /* FLAT does not have its text aligned to the start of
150 * the map while FDPIC ELF does ...
153 /* before we can check flat/fdpic, we need to
154 * make sure current is valid
156 if ((unsigned long)current >= FIXED_CODE_START &&
157 !((unsigned long)current & 0x3)) {
159 (address > current->mm->start_code) &&
160 (address < current->mm->end_code))
161 offset = address - current->mm->start_code;
163 offset = (address - vma->vm_start) +
164 (vma->vm_pgoff << PAGE_SHIFT);
166 sprintf(buf, "[ %s + 0x%lx ]", name, offset);
168 sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
169 name, vma->vm_start, vma->vm_end);
175 sprintf(buf, "[ %s ] dynamic memory", name);
184 /* we were unable to find this address anywhere */
185 sprintf(buf, "/* kernel dynamic memory */");
188 write_unlock_irqrestore(&tasklist_lock, flags);
194 asmlinkage void double_fault_c(struct pt_regs *fp)
196 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
198 trace_buffer_save(j);
202 oops_in_progress = 1;
203 #ifdef CONFIG_DEBUG_VERBOSE
204 printk(KERN_EMERG "Double Fault\n");
205 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
206 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
207 unsigned int cpu = raw_smp_processor_id();
209 decode_address(buf, cpu_pda[cpu].retx_doublefault);
210 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
211 (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
212 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
213 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
214 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
215 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
217 decode_address(buf, fp->retx);
218 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
222 dump_bfin_process(fp);
225 dump_bfin_trace_buffer();
228 panic("Double Fault - unrecoverable event");
232 static int kernel_mode_regs(struct pt_regs *regs)
234 return regs->ipend & 0xffc0;
237 asmlinkage notrace void trap_c(struct pt_regs *fp)
239 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
242 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
243 unsigned int cpu = raw_smp_processor_id();
245 const char *strerror = NULL;
248 unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
250 trace_buffer_save(j);
251 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
252 last_seqstat = (u32)fp->seqstat;
255 /* Important - be very careful dereferncing pointers - will lead to
256 * double faults if the stack has become corrupt
259 /* trap_c() will be called for exceptions. During exceptions
260 * processing, the pc value should be set with retx value.
261 * With this change we can cleanup some code in signal.c- TODO
263 fp->orig_pc = fp->retx;
264 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
265 trapnr, fp->ipend, fp->pc, fp->retx); */
267 /* send the appropriate signal to the user program */
270 /* This table works in conjuction with the one in ./mach-common/entry.S
271 * Some exceptions are handled there (in assembly, in exception space)
272 * Some are handled here, (in C, in interrupt space)
273 * Some, like CPLB, are handled in both, where the normal path is
274 * handled in assembly/exception space, and the error path is handled
278 /* 0x00 - Linux Syscall, getting here is an error */
279 /* 0x01 - userspace gdb breakpoint, handled here */
281 info.si_code = TRAP_ILLTRAP;
283 CHK_DEBUGGER_TRAP_MAYBE();
284 /* Check if this is a breakpoint in kernel space */
285 if (kernel_mode_regs(fp))
289 /* 0x03 - User Defined, userspace stack overflow */
291 info.si_code = SEGV_STACKFLOW;
293 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
294 CHK_DEBUGGER_TRAP_MAYBE();
296 /* 0x02 - KGDB initial connection and break signal trap */
299 info.si_code = TRAP_ILLTRAP;
304 /* 0x04 - User Defined */
305 /* 0x05 - User Defined */
306 /* 0x06 - User Defined */
307 /* 0x07 - User Defined */
308 /* 0x08 - User Defined */
309 /* 0x09 - User Defined */
310 /* 0x0A - User Defined */
311 /* 0x0B - User Defined */
312 /* 0x0C - User Defined */
313 /* 0x0D - User Defined */
314 /* 0x0E - User Defined */
315 /* 0x0F - User Defined */
316 /* If we got here, it is most likely that someone was trying to use a
317 * custom exception handler, and it is not actually installed properly
319 case VEC_EXCPT04 ... VEC_EXCPT15:
320 info.si_code = ILL_ILLPARAOP;
322 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
323 CHK_DEBUGGER_TRAP_MAYBE();
325 /* 0x10 HW Single step, handled here */
327 info.si_code = TRAP_STEP;
329 CHK_DEBUGGER_TRAP_MAYBE();
330 /* Check if this is a single step in kernel space */
331 if (kernel_mode_regs(fp))
335 /* 0x11 - Trace Buffer Full, handled here */
337 info.si_code = TRAP_TRACEFLOW;
339 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
340 CHK_DEBUGGER_TRAP_MAYBE();
342 /* 0x12 - Reserved, Caught by default */
343 /* 0x13 - Reserved, Caught by default */
344 /* 0x14 - Reserved, Caught by default */
345 /* 0x15 - Reserved, Caught by default */
346 /* 0x16 - Reserved, Caught by default */
347 /* 0x17 - Reserved, Caught by default */
348 /* 0x18 - Reserved, Caught by default */
349 /* 0x19 - Reserved, Caught by default */
350 /* 0x1A - Reserved, Caught by default */
351 /* 0x1B - Reserved, Caught by default */
352 /* 0x1C - Reserved, Caught by default */
353 /* 0x1D - Reserved, Caught by default */
354 /* 0x1E - Reserved, Caught by default */
355 /* 0x1F - Reserved, Caught by default */
356 /* 0x20 - Reserved, Caught by default */
357 /* 0x21 - Undefined Instruction, handled here */
360 if (kernel_mode_regs(fp)) {
361 switch (report_bug(fp->pc, fp)) {
362 case BUG_TRAP_TYPE_NONE:
364 case BUG_TRAP_TYPE_WARN:
365 dump_bfin_trace_buffer();
368 case BUG_TRAP_TYPE_BUG:
369 /* call to panic() will dump trace, and it is
370 * off at this point, so it won't be clobbered
376 info.si_code = ILL_ILLOPC;
378 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
379 CHK_DEBUGGER_TRAP_MAYBE();
381 /* 0x22 - Illegal Instruction Combination, handled here */
383 info.si_code = ILL_ILLPARAOP;
385 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
386 CHK_DEBUGGER_TRAP_MAYBE();
388 /* 0x23 - Data CPLB protection violation, handled here */
390 info.si_code = ILL_CPLB_VI;
392 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
393 CHK_DEBUGGER_TRAP_MAYBE();
395 /* 0x24 - Data access misaligned, handled here */
397 info.si_code = BUS_ADRALN;
399 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
400 CHK_DEBUGGER_TRAP_MAYBE();
402 /* 0x25 - Unrecoverable Event, handled here */
404 info.si_code = ILL_ILLEXCPT;
406 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
407 CHK_DEBUGGER_TRAP_MAYBE();
409 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
410 error case is handled here */
412 info.si_code = BUS_ADRALN;
414 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
416 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
418 info.si_code = ILL_CPLB_MULHIT;
420 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
421 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
422 strerror = KERN_NOTICE "NULL pointer access\n";
425 strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
426 CHK_DEBUGGER_TRAP_MAYBE();
428 /* 0x28 - Emulation Watchpoint, handled here */
430 info.si_code = TRAP_WATCHPT;
432 pr_debug(EXC_0x28(KERN_DEBUG));
433 CHK_DEBUGGER_TRAP_MAYBE();
434 /* Check if this is a watchpoint in kernel space */
435 if (kernel_mode_regs(fp))
440 /* 0x29 - Instruction fetch access error (535 only) */
441 case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
442 info.si_code = BUS_OPFETCH;
444 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
445 CHK_DEBUGGER_TRAP_MAYBE();
448 /* 0x29 - Reserved, Caught by default */
450 /* 0x2A - Instruction fetch misaligned, handled here */
452 info.si_code = BUS_ADRALN;
454 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
455 CHK_DEBUGGER_TRAP_MAYBE();
457 /* 0x2B - Instruction CPLB protection violation, handled here */
459 info.si_code = ILL_CPLB_VI;
461 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
462 CHK_DEBUGGER_TRAP_MAYBE();
464 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
466 info.si_code = ILL_CPLB_MISS;
468 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
470 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
471 case VEC_CPLB_I_MHIT:
472 info.si_code = ILL_CPLB_MULHIT;
474 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
475 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
476 strerror = KERN_NOTICE "Jump to NULL address\n";
479 strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
480 CHK_DEBUGGER_TRAP_MAYBE();
482 /* 0x2E - Illegal use of Supervisor Resource, handled here */
484 info.si_code = ILL_PRVOPC;
486 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
487 CHK_DEBUGGER_TRAP_MAYBE();
489 /* 0x2F - Reserved, Caught by default */
490 /* 0x30 - Reserved, Caught by default */
491 /* 0x31 - Reserved, Caught by default */
492 /* 0x32 - Reserved, Caught by default */
493 /* 0x33 - Reserved, Caught by default */
494 /* 0x34 - Reserved, Caught by default */
495 /* 0x35 - Reserved, Caught by default */
496 /* 0x36 - Reserved, Caught by default */
497 /* 0x37 - Reserved, Caught by default */
498 /* 0x38 - Reserved, Caught by default */
499 /* 0x39 - Reserved, Caught by default */
500 /* 0x3A - Reserved, Caught by default */
501 /* 0x3B - Reserved, Caught by default */
502 /* 0x3C - Reserved, Caught by default */
503 /* 0x3D - Reserved, Caught by default */
504 /* 0x3E - Reserved, Caught by default */
505 /* 0x3F - Reserved, Caught by default */
507 info.si_code = BUS_ADRALN;
509 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
510 /* System MMR Error */
511 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
512 info.si_code = BUS_ADRALN;
514 strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
516 /* External Memory Addressing Error */
517 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
518 info.si_code = BUS_ADRERR;
520 strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
522 /* Performance Monitor Overflow */
523 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
524 strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
526 /* RAISE 5 instruction */
527 case (SEQSTAT_HWERRCAUSE_RAISE_5):
528 printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
530 default: /* Reserved */
531 printk(KERN_NOTICE HWC_default(KERN_NOTICE));
534 CHK_DEBUGGER_TRAP_MAYBE();
537 * We should be handling all known exception types above,
538 * if we get here we hit a reserved one, so panic
541 info.si_code = ILL_ILLPARAOP;
543 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
544 (fp->seqstat & SEQSTAT_EXCAUSE));
545 CHK_DEBUGGER_TRAP_MAYBE();
551 /* If the fault was caused by a kernel thread, or interrupt handler
552 * we will kernel panic, so the system reboots.
554 if (kernel_mode_regs(fp) || (current && !current->mm)) {
556 oops_in_progress = 1;
559 if (sig != SIGTRAP) {
561 verbose_printk(strerror);
563 dump_bfin_process(fp);
567 /* Print out the trace buffer if it makes sense */
568 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
569 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
570 verbose_printk(KERN_NOTICE "No trace since you do not have "
571 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
574 dump_bfin_trace_buffer();
576 if (oops_in_progress) {
577 /* Dump the current kernel stack */
578 verbose_printk(KERN_NOTICE "Kernel Stack\n");
579 show_stack(current, NULL);
581 #ifndef CONFIG_ACCESS_CHECK
582 verbose_printk(KERN_EMERG "Please turn on "
583 "CONFIG_ACCESS_CHECK\n");
585 panic("Kernel exception");
587 #ifdef CONFIG_DEBUG_VERBOSE
588 unsigned long *stack;
589 /* Dump the user space stack */
590 stack = (unsigned long *)rdusp();
591 verbose_printk(KERN_NOTICE "Userspace Stack\n");
592 show_stack(NULL, stack);
598 if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
603 info.si_addr = (void __user *)fp->pc;
604 force_sig_info(sig, &info, current);
607 if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
608 (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
609 (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
610 fp->pc = SAFE_USER_INSTRUCTION;
613 trace_buffer_restore(j);
616 /* Typical exception handling routines */
618 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
621 * Similar to get_user, do some address checking, then dereference
622 * Return true on success, false on bad address
624 static bool get_instruction(unsigned short *val, unsigned short *address)
626 unsigned long addr = (unsigned long)address;
628 /* Check for odd addresses */
632 /* MMR region will never have instructions */
633 if (addr >= SYSMMR_BASE)
636 switch (bfin_mem_access_type(addr, 2)) {
637 case BFIN_MEM_ACCESS_CORE:
638 case BFIN_MEM_ACCESS_CORE_ONLY:
641 case BFIN_MEM_ACCESS_DMA:
642 dma_memcpy(val, address, 2);
644 case BFIN_MEM_ACCESS_ITEST:
645 isram_memcpy(val, address, 2);
647 default: /* invalid access */
653 * decode the instruction if we are printing out the trace, as it
654 * makes things easier to follow, without running it through objdump
655 * These are the normal instructions which cause change of flow, which
656 * would be at the source of the trace buffer
658 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
659 static void decode_instruction(unsigned short *address)
661 unsigned short opcode;
663 if (get_instruction(&opcode, address)) {
664 if (opcode == 0x0010)
665 verbose_printk("RTS");
666 else if (opcode == 0x0011)
667 verbose_printk("RTI");
668 else if (opcode == 0x0012)
669 verbose_printk("RTX");
670 else if (opcode == 0x0013)
671 verbose_printk("RTN");
672 else if (opcode == 0x0014)
673 verbose_printk("RTE");
674 else if (opcode == 0x0025)
675 verbose_printk("EMUEXCPT");
676 else if (opcode == 0x0040 && opcode <= 0x0047)
677 verbose_printk("STI R%i", opcode & 7);
678 else if (opcode >= 0x0050 && opcode <= 0x0057)
679 verbose_printk("JUMP (P%i)", opcode & 7);
680 else if (opcode >= 0x0060 && opcode <= 0x0067)
681 verbose_printk("CALL (P%i)", opcode & 7);
682 else if (opcode >= 0x0070 && opcode <= 0x0077)
683 verbose_printk("CALL (PC+P%i)", opcode & 7);
684 else if (opcode >= 0x0080 && opcode <= 0x0087)
685 verbose_printk("JUMP (PC+P%i)", opcode & 7);
686 else if (opcode >= 0x0090 && opcode <= 0x009F)
687 verbose_printk("RAISE 0x%x", opcode & 0xF);
688 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
689 verbose_printk("EXCPT 0x%x", opcode & 0xF);
690 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
691 verbose_printk("IF !CC JUMP");
692 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
693 verbose_printk("IF CC JUMP");
694 else if (opcode >= 0x2000 && opcode <= 0x2fff)
695 verbose_printk("JUMP.S");
696 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
697 verbose_printk("LSETUP");
698 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
699 verbose_printk("JUMP.L");
700 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
701 verbose_printk("CALL pcrel");
703 verbose_printk("0x%04x", opcode);
709 void dump_bfin_trace_buffer(void)
711 #ifdef CONFIG_DEBUG_VERBOSE
712 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
715 unsigned short *addr;
716 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
720 trace_buffer_save(tflags);
722 printk(KERN_NOTICE "Hardware Trace:\n");
724 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
725 printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
728 if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
729 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
730 decode_address(buf, (unsigned long)bfin_read_TBUF());
731 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
732 addr = (unsigned short *)bfin_read_TBUF();
733 decode_address(buf, (unsigned long)addr);
734 printk(KERN_NOTICE " Source : %s ", buf);
735 decode_instruction(addr);
740 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
741 if (trace_buff_offset)
742 index = trace_buff_offset / 4;
746 j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
748 decode_address(buf, software_trace_buff[index]);
749 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
753 decode_address(buf, software_trace_buff[index]);
754 printk(KERN_NOTICE " Source : %s ", buf);
755 decode_instruction((unsigned short *)software_trace_buff[index]);
765 trace_buffer_restore(tflags);
769 EXPORT_SYMBOL(dump_bfin_trace_buffer);
772 int is_valid_bugaddr(unsigned long addr)
774 unsigned short opcode;
776 if (!get_instruction(&opcode, (unsigned short *)addr))
779 return opcode == BFIN_BUG_OPCODE;
784 * Checks to see if the address pointed to is either a
785 * 16-bit CALL instruction, or a 32-bit CALL instruction
787 static bool is_bfin_call(unsigned short *addr)
789 unsigned short opcode = 0, *ins_addr;
790 ins_addr = (unsigned short *)addr;
792 if (!get_instruction(&opcode, ins_addr))
795 if ((opcode >= 0x0060 && opcode <= 0x0067) ||
796 (opcode >= 0x0070 && opcode <= 0x0077))
800 if (!get_instruction(&opcode, ins_addr))
803 if (opcode >= 0xE300 && opcode <= 0xE3FF)
810 void show_stack(struct task_struct *task, unsigned long *stack)
813 unsigned int *addr, *endstack, *fp = 0, *frame;
814 unsigned short *ins_addr;
816 unsigned int i, j, ret_addr, frame_no = 0;
819 * If we have been passed a specific stack, use that one otherwise
820 * if we have been passed a task structure, use that, otherwise
821 * use the stack of where the variable "stack" exists
826 /* We know this is a kernel stack, so this is the start/end */
827 stack = (unsigned long *)task->thread.ksp;
828 endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
830 /* print out the existing stack info */
831 stack = (unsigned long *)&stack;
832 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
835 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
837 printk(KERN_NOTICE "Stack info:\n");
838 decode_address(buf, (unsigned int)stack);
839 printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
841 if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
842 printk(KERN_NOTICE "Invalid stack pointer\n");
846 /* First thing is to look for a frame pointer */
847 for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
850 ins_addr = (unsigned short *)*addr;
852 if (is_bfin_call(ins_addr))
856 /* Let's check to see if it is a frame pointer */
857 while (fp >= (addr - 1) && fp < endstack
858 && fp && ((unsigned int) fp & 0x3) == 0)
859 fp = (unsigned int *)*fp;
860 if (fp == 0 || fp == endstack) {
869 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
874 * Now that we think we know where things are, we
875 * walk the stack again, this time printing things out
876 * incase there is no frame pointer, we still look for
877 * valid return addresses
880 /* First time print out data, next time, print out symbols */
881 for (j = 0; j <= 1; j++) {
883 printk(KERN_NOTICE "Return addresses in stack:\n");
885 printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
890 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
891 addr < endstack; addr++, i++) {
894 if (!j && i % 8 == 0)
895 printk(KERN_NOTICE "%p:",addr);
897 /* if it is an odd address, or zero, just skip it */
898 if (*addr & 0x1 || !*addr)
901 ins_addr = (unsigned short *)*addr;
903 /* Go back one instruction, and see if it is a CALL */
905 ret_addr = is_bfin_call(ins_addr);
907 if (!j && stack == (unsigned long *)addr)
908 printk("[%08x]", *addr);
911 decode_address(buf, (unsigned int)*addr);
913 printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
916 printk(KERN_NOTICE " address : %s\n", buf);
918 printk("<%08x>", *addr);
919 else if (fp == addr) {
923 printk("(%08x)", *addr);
925 fp = (unsigned int *)*addr;
929 printk(" %08x ", *addr);
936 EXPORT_SYMBOL(show_stack);
938 void dump_stack(void)
941 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
944 trace_buffer_save(tflags);
945 dump_bfin_trace_buffer();
946 show_stack(current, &stack);
947 trace_buffer_restore(tflags);
949 EXPORT_SYMBOL(dump_stack);
951 void dump_bfin_process(struct pt_regs *fp)
953 #ifdef CONFIG_DEBUG_VERBOSE
954 /* We should be able to look at fp->ipend, but we don't push it on the
955 * stack all the time, so do this until we fix that */
956 unsigned int context = bfin_read_IPEND();
958 if (oops_in_progress)
959 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
961 if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
962 verbose_printk(KERN_NOTICE "HW Error context\n");
963 else if (context & 0x0020)
964 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
965 else if (context & 0x3FC0)
966 verbose_printk(KERN_NOTICE "Interrupt context\n");
967 else if (context & 0x4000)
968 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
969 else if (context & 0x8000)
970 verbose_printk(KERN_NOTICE "Kernel process context\n");
972 /* Because we are crashing, and pointers could be bad, we check things
973 * pretty closely before we use them
975 if ((unsigned long)current >= FIXED_CODE_START &&
976 !((unsigned long)current & 0x3) && current->pid) {
977 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
978 if (current->comm >= (char *)FIXED_CODE_START)
979 verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
980 current->comm, current->pid);
982 verbose_printk(KERN_NOTICE "COMM= invalid\n");
984 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
985 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
986 verbose_printk(KERN_NOTICE
987 "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
988 " BSS = 0x%p-0x%p USER-STACK = 0x%p\n\n",
989 (void *)current->mm->start_code,
990 (void *)current->mm->end_code,
991 (void *)current->mm->start_data,
992 (void *)current->mm->end_data,
993 (void *)current->mm->end_data,
994 (void *)current->mm->brk,
995 (void *)current->mm->start_stack);
997 verbose_printk(KERN_NOTICE "invalid mm\n");
999 verbose_printk(KERN_NOTICE
1000 "No Valid process in current context\n");
1004 void dump_bfin_mem(struct pt_regs *fp)
1006 #ifdef CONFIG_DEBUG_VERBOSE
1007 unsigned short *addr, *erraddr, val = 0, err = 0;
1008 char sti = 0, buf[6];
1010 erraddr = (void *)fp->pc;
1012 verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1014 for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1015 addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1017 if (!((unsigned long)addr & 0xF))
1018 verbose_printk(KERN_NOTICE "0x%p: ", addr);
1020 if (!get_instruction(&val, addr)) {
1022 sprintf(buf, "????");
1024 sprintf(buf, "%04x", val);
1026 if (addr == erraddr) {
1027 verbose_printk("[%s]", buf);
1030 verbose_printk(" %s ", buf);
1032 /* Do any previous instructions turn on interrupts? */
1033 if (addr <= erraddr && /* in the past */
1034 ((val >= 0x0040 && val <= 0x0047) || /* STI instruction */
1035 val == 0x017b)) /* [SP++] = RETI */
1039 verbose_printk("\n");
1041 /* Hardware error interrupts can be deferred */
1042 if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1044 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1045 #ifndef CONFIG_DEBUG_HWERR
1046 verbose_printk(KERN_NOTICE
1047 "The remaining message may be meaningless\n"
1048 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1050 /* If we are handling only one peripheral interrupt
1051 * and current mm and pid are valid, and the last error
1052 * was in that user space process's text area
1053 * print it out - because that is where the problem exists
1055 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1056 (current->pid && current->mm)) {
1057 /* And the last RETI points to the current userspace context */
1058 if ((fp + 1)->pc >= current->mm->start_code &&
1059 (fp + 1)->pc <= current->mm->end_code) {
1060 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1061 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1063 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1071 void show_regs(struct pt_regs *fp)
1073 #ifdef CONFIG_DEBUG_VERBOSE
1075 struct irqaction *action;
1077 unsigned long flags = 0;
1078 unsigned int cpu = raw_smp_processor_id();
1079 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1081 verbose_printk(KERN_NOTICE "\n");
1082 if (CPUID != bfin_cpuid())
1083 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1084 "but running on:0x%04x (Rev %d)\n",
1085 CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1087 verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1088 CPU, bfin_compiled_revid());
1090 if (bfin_compiled_revid() != bfin_revid())
1091 verbose_printk("(Detected 0.%d)", bfin_revid());
1093 verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1094 get_cclk()/1000000, get_sclk()/1000000,
1102 verbose_printk(KERN_NOTICE "%s", linux_banner);
1104 verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
1105 verbose_printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx IMASK: %04lx SYSCFG: %04lx\n",
1106 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1107 if (fp->ipend & EVT_IRPTEN)
1108 verbose_printk(KERN_NOTICE " Global Interrupts Disabled (IPEND[4])\n");
1109 if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1110 EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1111 verbose_printk(KERN_NOTICE " Peripheral interrupts masked off\n");
1112 if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1113 verbose_printk(KERN_NOTICE " Kernel interrupts masked off\n");
1114 if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1115 verbose_printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
1116 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1118 /* If the error was from the EBIU, print it out */
1119 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1120 verbose_printk(KERN_NOTICE " EBIU Error Reason : 0x%04x\n",
1121 bfin_read_EBIU_ERRMST());
1122 verbose_printk(KERN_NOTICE " EBIU Error Address : 0x%08x\n",
1123 bfin_read_EBIU_ERRADD());
1127 verbose_printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
1128 fp->seqstat & SEQSTAT_EXCAUSE);
1129 for (i = 2; i <= 15 ; i++) {
1130 if (fp->ipend & (1 << i)) {
1132 decode_address(buf, bfin_read32(EVT0 + 4*i));
1133 verbose_printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf);
1135 verbose_printk(KERN_NOTICE " interrupts disabled\n");
1139 /* if no interrupts are going off, don't print this out */
1140 if (fp->ipend & ~0x3F) {
1141 for (i = 0; i < (NR_IRQS - 1); i++) {
1143 spin_lock_irqsave(&irq_desc[i].lock, flags);
1145 action = irq_desc[i].action;
1149 decode_address(buf, (unsigned int)action->handler);
1150 verbose_printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf);
1151 for (action = action->next; action; action = action->next) {
1152 decode_address(buf, (unsigned int)action->handler);
1153 verbose_printk(", %s", buf);
1155 verbose_printk("\n");
1158 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1162 decode_address(buf, fp->rete);
1163 verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1164 decode_address(buf, fp->retn);
1165 verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1166 decode_address(buf, fp->retx);
1167 verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1168 decode_address(buf, fp->rets);
1169 verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1170 decode_address(buf, fp->pc);
1171 verbose_printk(KERN_NOTICE " PC : %s\n", buf);
1173 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
1174 (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1175 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1176 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1177 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1178 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1181 verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1182 verbose_printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
1183 fp->r0, fp->r1, fp->r2, fp->r3);
1184 verbose_printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
1185 fp->r4, fp->r5, fp->r6, fp->r7);
1186 verbose_printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
1187 fp->p0, fp->p1, fp->p2, fp->p3);
1188 verbose_printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
1189 fp->p4, fp->p5, fp->fp, (long)fp);
1190 verbose_printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n",
1191 fp->lb0, fp->lt0, fp->lc0);
1192 verbose_printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n",
1193 fp->lb1, fp->lt1, fp->lc1);
1194 verbose_printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
1195 fp->b0, fp->l0, fp->m0, fp->i0);
1196 verbose_printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
1197 fp->b1, fp->l1, fp->m1, fp->i1);
1198 verbose_printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
1199 fp->b2, fp->l2, fp->m2, fp->i2);
1200 verbose_printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
1201 fp->b3, fp->l3, fp->m3, fp->i3);
1202 verbose_printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
1203 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1205 verbose_printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n",
1206 rdusp(), fp->astat);
1208 verbose_printk(KERN_NOTICE "\n");
1212 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1213 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1216 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1218 asmlinkage int sys_bfin_spinlock(int *p)
1222 spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1223 ret = get_user(tmp, p);
1224 if (likely(ret == 0)) {
1230 spin_unlock(&bfin_spinlock_lock);
1234 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1236 void (*curr_handler)(void);
1238 if (exception > 0x3F)
1241 curr_handler = ex_table[exception];
1243 if (curr_handler != ex_replaceable)
1246 ex_table[exception] = handler;
1250 EXPORT_SYMBOL(bfin_request_exception);
1252 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1254 void (*curr_handler)(void);
1256 if (exception > 0x3F)
1259 curr_handler = ex_table[exception];
1261 if (curr_handler != handler)
1264 ex_table[exception] = ex_replaceable;
1268 EXPORT_SYMBOL(bfin_free_exception);
1270 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1272 switch (cplb_panic) {
1273 case CPLB_NO_UNLOCKED:
1274 printk(KERN_EMERG "All CPLBs are locked\n");
1276 case CPLB_PROT_VIOL:
1278 case CPLB_NO_ADDR_MATCH:
1280 case CPLB_UNKNOWN_ERR:
1281 printk(KERN_EMERG "Unknown CPLB Exception\n");
1285 oops_in_progress = 1;
1287 dump_bfin_process(fp);
1291 panic("Unrecoverable event");