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>
46 # include <linux/kgdb.h>
48 # define CHK_DEBUGGER_TRAP() \
50 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
52 # define CHK_DEBUGGER_TRAP_MAYBE() \
55 CHK_DEBUGGER_TRAP(); \
58 # define CHK_DEBUGGER_TRAP() do { } while (0)
59 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
62 /* Initiate the event table handler */
63 void __init trap_init(void)
66 bfin_write_EVT3(trap);
71 * Used to save the RETX, SEQSTAT, I/D CPLB FAULT ADDR
72 * values across the transition from exception to IRQ5.
73 * We put these in L1, so they are going to be in a valid
74 * location during exception context
76 __attribute__((l1_data))
77 unsigned long saved_retx, saved_seqstat,
78 saved_icplb_fault_addr, saved_dcplb_fault_addr;
80 static void decode_address(char *buf, unsigned long address)
82 struct vm_list_struct *vml;
83 struct task_struct *p;
85 unsigned long flags, offset;
86 unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
88 #ifdef CONFIG_KALLSYMS
89 unsigned long symsize;
95 /* look up the address and see if we are in kernel space */
96 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
99 /* yeah! kernel space! */
101 modname = delim = "";
102 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
103 (void *)address, delim, modname, delim, symname,
104 (unsigned long)offset);
110 /* Problem in fixed code section? */
111 if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
112 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
116 /* Problem somewhere before the kernel start address */
117 if (address < CONFIG_BOOT_LOAD) {
118 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
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 vml = mm->context.vmlist;
134 struct vm_area_struct *vma = vml->vma;
136 if (address >= vma->vm_start && address < vma->vm_end) {
138 char *name = p->comm;
139 struct file *file = vma->vm_file;
142 name = d_path(&file->f_path, _tmpbuf,
145 /* FLAT does not have its text aligned to the start of
146 * the map while FDPIC ELF does ...
149 /* before we can check flat/fdpic, we need to
150 * make sure current is valid
152 if ((unsigned long)current >= FIXED_CODE_START &&
153 !((unsigned long)current & 0x3)) {
155 (address > current->mm->start_code) &&
156 (address < current->mm->end_code))
157 offset = address - current->mm->start_code;
159 offset = (address - vma->vm_start) +
160 (vma->vm_pgoff << PAGE_SHIFT);
162 sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
163 (void *)address, name, offset);
165 sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
166 (void *)address, name,
167 vma->vm_start, vma->vm_end);
173 sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
184 /* we were unable to find this address anywhere */
185 sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
188 write_unlock_irqrestore(&tasklist_lock, flags);
191 asmlinkage void double_fault_c(struct pt_regs *fp)
194 oops_in_progress = 1;
195 printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
196 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
197 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) == VEC_UNCOV) {
199 decode_address(buf, saved_retx);
200 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
201 (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
202 decode_address(buf, saved_dcplb_fault_addr);
203 printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %s\n", buf);
204 decode_address(buf, saved_icplb_fault_addr);
205 printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %s\n", buf);
207 decode_address(buf, fp->retx);
208 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
213 dump_bfin_process(fp);
217 panic("Double Fault - unrecoverable event\n");
221 asmlinkage void trap_c(struct pt_regs *fp)
223 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
228 unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
230 trace_buffer_save(j);
232 /* Important - be very careful dereferncing pointers - will lead to
233 * double faults if the stack has become corrupt
236 /* If the fault was caused by a kernel thread, or interrupt handler
237 * we will kernel panic, so the system reboots.
238 * If KGDB is enabled, don't set this for kernel breakpoints
241 /* TODO: check to see if we are in some sort of deferred HWERR
242 * that we should be able to recover from, not kernel panic
244 if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
246 && (trapnr != VEC_EXCPT02)
250 oops_in_progress = 1;
251 } else if (current) {
252 if (current->mm == NULL) {
254 oops_in_progress = 1;
258 /* trap_c() will be called for exceptions. During exceptions
259 * processing, the pc value should be set with retx value.
260 * With this change we can cleanup some code in signal.c- TODO
262 fp->orig_pc = fp->retx;
263 /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
264 trapnr, fp->ipend, fp->pc, fp->retx); */
266 /* send the appropriate signal to the user program */
269 /* This table works in conjuction with the one in ./mach-common/entry.S
270 * Some exceptions are handled there (in assembly, in exception space)
271 * Some are handled here, (in C, in interrupt space)
272 * Some, like CPLB, are handled in both, where the normal path is
273 * handled in assembly/exception space, and the error path is handled
277 /* 0x00 - Linux Syscall, getting here is an error */
278 /* 0x01 - userspace gdb breakpoint, handled here */
280 info.si_code = TRAP_ILLTRAP;
282 CHK_DEBUGGER_TRAP_MAYBE();
283 /* Check if this is a breakpoint in kernel space */
284 if (fp->ipend & 0xffc0)
289 case VEC_EXCPT02 : /* gdb connection */
290 info.si_code = TRAP_ILLTRAP;
295 /* 0x02 - User Defined, Caught by default */
297 /* 0x03 - User Defined, userspace stack overflow */
299 info.si_code = SEGV_STACKFLOW;
301 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
302 CHK_DEBUGGER_TRAP_MAYBE();
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 */
317 * If we got here, it is most likely that someone was trying to use a
318 * custom exception handler, and it is not actually installed properly
320 case VEC_EXCPT04 ... VEC_EXCPT15:
321 info.si_code = ILL_ILLPARAOP;
323 printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
324 CHK_DEBUGGER_TRAP_MAYBE();
326 /* 0x10 HW Single step, handled here */
328 info.si_code = TRAP_STEP;
330 CHK_DEBUGGER_TRAP_MAYBE();
331 /* Check if this is a single step in kernel space */
332 if (fp->ipend & 0xffc0)
336 /* 0x11 - Trace Buffer Full, handled here */
338 info.si_code = TRAP_TRACEFLOW;
340 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
341 CHK_DEBUGGER_TRAP_MAYBE();
343 /* 0x12 - Reserved, Caught by default */
344 /* 0x13 - Reserved, Caught by default */
345 /* 0x14 - Reserved, Caught by default */
346 /* 0x15 - Reserved, Caught by default */
347 /* 0x16 - Reserved, Caught by default */
348 /* 0x17 - Reserved, Caught by default */
349 /* 0x18 - Reserved, Caught by default */
350 /* 0x19 - Reserved, Caught by default */
351 /* 0x1A - Reserved, Caught by default */
352 /* 0x1B - Reserved, Caught by default */
353 /* 0x1C - Reserved, Caught by default */
354 /* 0x1D - Reserved, Caught by default */
355 /* 0x1E - Reserved, Caught by default */
356 /* 0x1F - Reserved, Caught by default */
357 /* 0x20 - Reserved, Caught by default */
358 /* 0x21 - Undefined Instruction, handled here */
360 info.si_code = ILL_ILLOPC;
362 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
363 CHK_DEBUGGER_TRAP_MAYBE();
365 /* 0x22 - Illegal Instruction Combination, handled here */
367 info.si_code = ILL_ILLPARAOP;
369 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
370 CHK_DEBUGGER_TRAP_MAYBE();
372 /* 0x23 - Data CPLB protection violation, handled here */
374 info.si_code = ILL_CPLB_VI;
376 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
377 CHK_DEBUGGER_TRAP_MAYBE();
379 /* 0x24 - Data access misaligned, handled here */
381 info.si_code = BUS_ADRALN;
383 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
384 CHK_DEBUGGER_TRAP_MAYBE();
386 /* 0x25 - Unrecoverable Event, handled here */
388 info.si_code = ILL_ILLEXCPT;
390 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
391 CHK_DEBUGGER_TRAP_MAYBE();
393 /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
394 error case is handled here */
396 info.si_code = BUS_ADRALN;
398 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
400 /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
402 info.si_code = ILL_CPLB_MULHIT;
404 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
405 if (saved_dcplb_fault_addr < FIXED_CODE_START)
406 printk(KERN_NOTICE "NULL pointer access\n");
409 printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
410 CHK_DEBUGGER_TRAP_MAYBE();
412 /* 0x28 - Emulation Watchpoint, handled here */
414 info.si_code = TRAP_WATCHPT;
416 pr_debug(EXC_0x28(KERN_DEBUG));
417 CHK_DEBUGGER_TRAP_MAYBE();
418 /* Check if this is a watchpoint in kernel space */
419 if (fp->ipend & 0xffc0)
424 /* 0x29 - Instruction fetch access error (535 only) */
425 case VEC_ISTRU_VL: /* ADSP-BF535 only (MH) */
426 info.si_code = BUS_OPFETCH;
428 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
429 CHK_DEBUGGER_TRAP_MAYBE();
432 /* 0x29 - Reserved, Caught by default */
434 /* 0x2A - Instruction fetch misaligned, handled here */
436 info.si_code = BUS_ADRALN;
438 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
439 CHK_DEBUGGER_TRAP_MAYBE();
441 /* 0x2B - Instruction CPLB protection violation, handled here */
443 info.si_code = ILL_CPLB_VI;
445 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
446 CHK_DEBUGGER_TRAP_MAYBE();
448 /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
450 info.si_code = ILL_CPLB_MISS;
452 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
454 /* 0x2D - Instruction CPLB Multiple Hits, handled here */
455 case VEC_CPLB_I_MHIT:
456 info.si_code = ILL_CPLB_MULHIT;
458 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
459 if (saved_icplb_fault_addr < FIXED_CODE_START)
460 printk(KERN_NOTICE "Jump to NULL address\n");
463 printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
464 CHK_DEBUGGER_TRAP_MAYBE();
466 /* 0x2E - Illegal use of Supervisor Resource, handled here */
468 info.si_code = ILL_PRVOPC;
470 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
471 CHK_DEBUGGER_TRAP_MAYBE();
473 /* 0x2F - Reserved, Caught by default */
474 /* 0x30 - Reserved, Caught by default */
475 /* 0x31 - Reserved, Caught by default */
476 /* 0x32 - Reserved, Caught by default */
477 /* 0x33 - Reserved, Caught by default */
478 /* 0x34 - Reserved, Caught by default */
479 /* 0x35 - Reserved, Caught by default */
480 /* 0x36 - Reserved, Caught by default */
481 /* 0x37 - Reserved, Caught by default */
482 /* 0x38 - Reserved, Caught by default */
483 /* 0x39 - Reserved, Caught by default */
484 /* 0x3A - Reserved, Caught by default */
485 /* 0x3B - Reserved, Caught by default */
486 /* 0x3C - Reserved, Caught by default */
487 /* 0x3D - Reserved, Caught by default */
488 /* 0x3E - Reserved, Caught by default */
489 /* 0x3F - Reserved, Caught by default */
491 info.si_code = BUS_ADRALN;
493 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
494 /* System MMR Error */
495 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
496 info.si_code = BUS_ADRALN;
498 printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
500 /* External Memory Addressing Error */
501 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
502 info.si_code = BUS_ADRERR;
504 printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
506 /* Performance Monitor Overflow */
507 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
508 printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
510 /* RAISE 5 instruction */
511 case (SEQSTAT_HWERRCAUSE_RAISE_5):
512 printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
514 default: /* Reserved */
515 printk(KERN_NOTICE HWC_default(KERN_NOTICE));
518 CHK_DEBUGGER_TRAP_MAYBE();
521 * We should be handling all known exception types above,
522 * if we get here we hit a reserved one, so panic
525 oops_in_progress = 1;
526 info.si_code = ILL_ILLPARAOP;
528 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
529 (fp->seqstat & SEQSTAT_EXCAUSE));
530 CHK_DEBUGGER_TRAP_MAYBE();
536 if (sig != SIGTRAP) {
537 unsigned long *stack;
538 dump_bfin_process(fp);
542 /* Print out the trace buffer if it makes sense */
543 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
544 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
545 printk(KERN_NOTICE "No trace since you do not have "
546 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
550 dump_bfin_trace_buffer();
552 if (oops_in_progress) {
553 /* Dump the current kernel stack */
554 printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
555 show_stack(current, NULL);
558 #ifndef CONFIG_ACCESS_CHECK
559 printk(KERN_EMERG "Please turn on "
560 "CONFIG_ACCESS_CHECK\n");
562 panic("Kernel exception");
564 /* Dump the user space stack */
565 stack = (unsigned long *)rdusp();
566 printk(KERN_NOTICE "Userspace Stack\n");
567 show_stack(NULL, stack);
573 info.si_addr = (void __user *)fp->pc;
574 force_sig_info(sig, &info, current);
576 trace_buffer_restore(j);
580 /* Typical exception handling routines */
582 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
585 * Similar to get_user, do some address checking, then dereference
586 * Return true on sucess, false on bad address
588 bool get_instruction(unsigned short *val, unsigned short *address)
593 addr = (unsigned long)address;
595 /* Check for odd addresses */
599 /* Check that things do not wrap around */
600 if (addr > (addr + 2))
604 * Since we are in exception context, we need to do a little address checking
605 * We need to make sure we are only accessing valid memory, and
606 * we don't read something in the async space that can hang forever
608 if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
610 (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
612 (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
613 #if L1_DATA_A_LENGTH != 0
614 (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
616 #if L1_DATA_B_LENGTH != 0
617 (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
619 (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
620 (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
621 addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
622 (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
623 addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
624 (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
625 addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
626 (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
627 addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
632 #if L1_CODE_LENGTH != 0
633 if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
634 dma_memcpy(val, address, 2);
644 * decode the instruction if we are printing out the trace, as it
645 * makes things easier to follow, without running it through objdump
646 * These are the normal instructions which cause change of flow, which
647 * would be at the source of the trace buffer
649 void decode_instruction(unsigned short *address)
651 unsigned short opcode;
653 if (get_instruction(&opcode, address)) {
654 if (opcode == 0x0010)
656 else if (opcode == 0x0011)
658 else if (opcode == 0x0012)
660 else if (opcode >= 0x0050 && opcode <= 0x0057)
661 printk("JUMP (P%i)", opcode & 7);
662 else if (opcode >= 0x0060 && opcode <= 0x0067)
663 printk("CALL (P%i)", opcode & 7);
664 else if (opcode >= 0x0070 && opcode <= 0x0077)
665 printk("CALL (PC+P%i)", opcode & 7);
666 else if (opcode >= 0x0080 && opcode <= 0x0087)
667 printk("JUMP (PC+P%i)", opcode & 7);
668 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
669 printk("IF !CC JUMP");
670 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
671 printk("IF CC JUMP");
672 else if (opcode >= 0x2000 && opcode <= 0x2fff)
674 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
676 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
678 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
679 printk("CALL pcrel");
681 printk("0x%04x", opcode);
686 void dump_bfin_trace_buffer(void)
688 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
691 unsigned short *addr;
692 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
696 trace_buffer_save(tflags);
698 printk(KERN_NOTICE "Hardware Trace:\n");
700 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
701 printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
704 if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
705 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
706 decode_address(buf, (unsigned long)bfin_read_TBUF());
707 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
708 addr = (unsigned short *)bfin_read_TBUF();
709 decode_address(buf, (unsigned long)addr);
710 printk(KERN_NOTICE " Source : %s ", buf);
711 decode_instruction(addr);
716 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
717 if (trace_buff_offset)
718 index = trace_buff_offset / 4;
722 j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
724 decode_address(buf, software_trace_buff[index]);
725 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
729 decode_address(buf, software_trace_buff[index]);
730 printk(KERN_NOTICE " Source : %s ", buf);
731 decode_instruction((unsigned short *)software_trace_buff[index]);
741 trace_buffer_restore(tflags);
744 EXPORT_SYMBOL(dump_bfin_trace_buffer);
747 * Checks to see if the address pointed to is either a
748 * 16-bit CALL instruction, or a 32-bit CALL instruction
750 bool is_bfin_call(unsigned short *addr)
752 unsigned short opcode = 0, *ins_addr;
753 ins_addr = (unsigned short *)addr;
755 if (!get_instruction(&opcode, ins_addr))
758 if ((opcode >= 0x0060 && opcode <= 0x0067) ||
759 (opcode >= 0x0070 && opcode <= 0x0077))
763 if (!get_instruction(&opcode, ins_addr))
766 if (opcode >= 0xE300 && opcode <= 0xE3FF)
772 void show_stack(struct task_struct *task, unsigned long *stack)
774 unsigned int *addr, *endstack, *fp = 0, *frame;
775 unsigned short *ins_addr;
777 unsigned int i, j, ret_addr, frame_no = 0;
780 * If we have been passed a specific stack, use that one otherwise
781 * if we have been passed a task structure, use that, otherwise
782 * use the stack of where the variable "stack" exists
787 /* We know this is a kernel stack, so this is the start/end */
788 stack = (unsigned long *)task->thread.ksp;
789 endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
791 /* print out the existing stack info */
792 stack = (unsigned long *)&stack;
793 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
796 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
798 decode_address(buf, (unsigned int)stack);
799 printk(KERN_NOTICE "Stack info:\n" KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
800 addr = (unsigned int *)((unsigned int)stack & ~0x3F);
802 /* First thing is to look for a frame pointer */
803 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
804 addr < endstack; addr++, i++) {
807 ins_addr = (unsigned short *)*addr;
809 if (is_bfin_call(ins_addr))
813 /* Let's check to see if it is a frame pointer */
814 while (fp >= (addr - 1) && fp < endstack && fp)
815 fp = (unsigned int *)*fp;
816 if (fp == 0 || fp == endstack) {
825 printk(" FP: (0x%p)\n", fp);
830 * Now that we think we know where things are, we
831 * walk the stack again, this time printing things out
832 * incase there is no frame pointer, we still look for
833 * valid return addresses
836 /* First time print out data, next time, print out symbols */
837 for (j = 0; j <= 1; j++) {
839 printk(KERN_NOTICE "Return addresses in stack:\n");
841 printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
846 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
847 addr <= endstack; addr++, i++) {
850 if (!j && i % 8 == 0)
851 printk("\n" KERN_NOTICE "%p:",addr);
853 /* if it is an odd address, or zero, just skip it */
854 if (*addr & 0x1 || !*addr)
857 ins_addr = (unsigned short *)*addr;
859 /* Go back one instruction, and see if it is a CALL */
861 ret_addr = is_bfin_call(ins_addr);
863 if (!j && stack == (unsigned long *)addr)
864 printk("[%08x]", *addr);
867 decode_address(buf, (unsigned int)*addr);
869 printk(KERN_NOTICE " frame %2i : %s\n", frame_no, buf);
872 printk(KERN_NOTICE " address : %s\n", buf);
874 printk("<%08x>", *addr);
875 else if (fp == addr) {
879 printk("(%08x)", *addr);
881 fp = (unsigned int *)*addr;
885 printk(" %08x ", *addr);
893 void dump_stack(void)
896 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
899 trace_buffer_save(tflags);
900 dump_bfin_trace_buffer();
901 show_stack(current, &stack);
902 trace_buffer_restore(tflags);
904 EXPORT_SYMBOL(dump_stack);
906 void dump_bfin_process(struct pt_regs *fp)
908 /* We should be able to look at fp->ipend, but we don't push it on the
909 * stack all the time, so do this until we fix that */
910 unsigned int context = bfin_read_IPEND();
912 if (oops_in_progress)
913 printk(KERN_EMERG "Kernel OOPS in progress\n");
915 if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
916 printk(KERN_NOTICE "HW Error context\n");
917 else if (context & 0x0020)
918 printk(KERN_NOTICE "Deferred Exception context\n");
919 else if (context & 0x3FC0)
920 printk(KERN_NOTICE "Interrupt context\n");
921 else if (context & 0x4000)
922 printk(KERN_NOTICE "Deferred Interrupt context\n");
923 else if (context & 0x8000)
924 printk(KERN_NOTICE "Kernel process context\n");
926 /* Because we are crashing, and pointers could be bad, we check things
927 * pretty closely before we use them
929 if ((unsigned long)current >= FIXED_CODE_START &&
930 !((unsigned long)current & 0x3) && current->pid) {
931 printk(KERN_NOTICE "CURRENT PROCESS:\n");
932 if (current->comm >= (char *)FIXED_CODE_START)
933 printk(KERN_NOTICE "COMM=%s PID=%d\n",
934 current->comm, current->pid);
936 printk(KERN_NOTICE "COMM= invalid\n");
938 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
939 printk(KERN_NOTICE "TEXT = 0x%p-0x%p DATA = 0x%p-0x%p\n"
940 KERN_NOTICE " BSS = 0x%p-0x%p USER-STACK = 0x%p\n"
942 (void *)current->mm->start_code,
943 (void *)current->mm->end_code,
944 (void *)current->mm->start_data,
945 (void *)current->mm->end_data,
946 (void *)current->mm->end_data,
947 (void *)current->mm->brk,
948 (void *)current->mm->start_stack);
950 printk(KERN_NOTICE "invalid mm\n");
952 printk(KERN_NOTICE "\n" KERN_NOTICE
953 "No Valid process in current context\n");
956 void dump_bfin_mem(struct pt_regs *fp)
958 unsigned short *addr, *erraddr, val = 0, err = 0;
959 char sti = 0, buf[6];
961 erraddr = (void *)fp->pc;
963 printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
965 for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
966 addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
968 if (!((unsigned long)addr & 0xF))
969 printk("\n" KERN_NOTICE "0x%p: ", addr);
971 if (get_instruction(&val, addr)) {
973 sprintf(buf, "????");
975 sprintf(buf, "%04x", val);
977 if (addr == erraddr) {
983 /* Do any previous instructions turn on interrupts? */
984 if (addr <= erraddr && /* in the past */
985 ((val >= 0x0040 && val <= 0x0047) || /* STI instruction */
986 val == 0x017b)) /* [SP++] = RETI */
992 /* Hardware error interrupts can be deferred */
993 if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
995 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
996 #ifndef CONFIG_DEBUG_HWERR
997 printk(KERN_NOTICE "The remaining message may be meaningless\n"
998 KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
999 " better idea where it came from\n");
1001 /* If we are handling only one peripheral interrupt
1002 * and current mm and pid are valid, and the last error
1003 * was in that user space process's text area
1004 * print it out - because that is where the problem exists
1006 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1007 (current->pid && current->mm)) {
1008 /* And the last RETI points to the current userspace context */
1009 if ((fp + 1)->pc >= current->mm->start_code &&
1010 (fp + 1)->pc <= current->mm->end_code) {
1011 printk(KERN_NOTICE "It might be better to look around here : \n");
1012 printk(KERN_NOTICE "-------------------------------------------\n");
1014 printk(KERN_NOTICE "-------------------------------------------\n");
1021 void show_regs(struct pt_regs *fp)
1024 struct irqaction *action;
1026 unsigned long flags;
1028 printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1029 printk(KERN_NOTICE " SEQSTAT: %08lx IPEND: %04lx SYSCFG: %04lx\n",
1030 (long)fp->seqstat, fp->ipend, fp->syscfg);
1031 printk(KERN_NOTICE " HWERRCAUSE: 0x%lx\n",
1032 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1033 printk(KERN_NOTICE " EXCAUSE : 0x%lx\n",
1034 fp->seqstat & SEQSTAT_EXCAUSE);
1035 for (i = 6; i <= 15 ; i++) {
1036 if (fp->ipend & (1 << i)) {
1037 decode_address(buf, bfin_read32(EVT0 + 4*i));
1038 printk(KERN_NOTICE " physical IVG%i asserted : %s\n", i, buf);
1042 /* if no interrupts are going off, don't print this out */
1043 if (fp->ipend & ~0x3F) {
1044 for (i = 0; i < (NR_IRQS - 1); i++) {
1045 spin_lock_irqsave(&irq_desc[i].lock, flags);
1046 action = irq_desc[i].action;
1050 decode_address(buf, (unsigned int)action->handler);
1051 printk(KERN_NOTICE " logical irq %3d mapped : %s", i, buf);
1052 for (action = action->next; action; action = action->next) {
1053 decode_address(buf, (unsigned int)action->handler);
1054 printk(", %s", buf);
1058 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1062 decode_address(buf, fp->rete);
1063 printk(KERN_NOTICE " RETE: %s\n", buf);
1064 decode_address(buf, fp->retn);
1065 printk(KERN_NOTICE " RETN: %s\n", buf);
1066 decode_address(buf, fp->retx);
1067 printk(KERN_NOTICE " RETX: %s\n", buf);
1068 decode_address(buf, fp->rets);
1069 printk(KERN_NOTICE " RETS: %s\n", buf);
1070 decode_address(buf, fp->pc);
1071 printk(KERN_NOTICE " PC : %s\n", buf);
1073 if (((long)fp->seqstat & SEQSTAT_EXCAUSE) &&
1074 (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1075 decode_address(buf, saved_dcplb_fault_addr);
1076 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1077 decode_address(buf, saved_icplb_fault_addr);
1078 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1081 printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1082 printk(KERN_NOTICE " R0 : %08lx R1 : %08lx R2 : %08lx R3 : %08lx\n",
1083 fp->r0, fp->r1, fp->r2, fp->r3);
1084 printk(KERN_NOTICE " R4 : %08lx R5 : %08lx R6 : %08lx R7 : %08lx\n",
1085 fp->r4, fp->r5, fp->r6, fp->r7);
1086 printk(KERN_NOTICE " P0 : %08lx P1 : %08lx P2 : %08lx P3 : %08lx\n",
1087 fp->p0, fp->p1, fp->p2, fp->p3);
1088 printk(KERN_NOTICE " P4 : %08lx P5 : %08lx FP : %08lx SP : %08lx\n",
1089 fp->p4, fp->p5, fp->fp, (long)fp);
1090 printk(KERN_NOTICE " LB0: %08lx LT0: %08lx LC0: %08lx\n",
1091 fp->lb0, fp->lt0, fp->lc0);
1092 printk(KERN_NOTICE " LB1: %08lx LT1: %08lx LC1: %08lx\n",
1093 fp->lb1, fp->lt1, fp->lc1);
1094 printk(KERN_NOTICE " B0 : %08lx L0 : %08lx M0 : %08lx I0 : %08lx\n",
1095 fp->b0, fp->l0, fp->m0, fp->i0);
1096 printk(KERN_NOTICE " B1 : %08lx L1 : %08lx M1 : %08lx I1 : %08lx\n",
1097 fp->b1, fp->l1, fp->m1, fp->i1);
1098 printk(KERN_NOTICE " B2 : %08lx L2 : %08lx M2 : %08lx I2 : %08lx\n",
1099 fp->b2, fp->l2, fp->m2, fp->i2);
1100 printk(KERN_NOTICE " B3 : %08lx L3 : %08lx M3 : %08lx I3 : %08lx\n",
1101 fp->b3, fp->l3, fp->m3, fp->i3);
1102 printk(KERN_NOTICE "A0.w: %08lx A0.x: %08lx A1.w: %08lx A1.x: %08lx\n",
1103 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1105 printk(KERN_NOTICE "USP : %08lx ASTAT: %08lx\n",
1106 rdusp(), fp->astat);
1108 printk(KERN_NOTICE "\n");
1111 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1112 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1115 asmlinkage int sys_bfin_spinlock(int *spinlock)
1120 local_irq_disable();
1121 ret = get_user(tmp, spinlock);
1126 put_user(tmp, spinlock);
1132 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1134 void (*curr_handler)(void);
1136 if (exception > 0x3F)
1139 curr_handler = ex_table[exception];
1141 if (curr_handler != ex_replaceable)
1144 ex_table[exception] = handler;
1148 EXPORT_SYMBOL(bfin_request_exception);
1150 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1152 void (*curr_handler)(void);
1154 if (exception > 0x3F)
1157 curr_handler = ex_table[exception];
1159 if (curr_handler != handler)
1162 ex_table[exception] = ex_replaceable;
1166 EXPORT_SYMBOL(bfin_free_exception);
1168 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1170 switch (cplb_panic) {
1171 case CPLB_NO_UNLOCKED:
1172 printk(KERN_EMERG "All CPLBs are locked\n");
1174 case CPLB_PROT_VIOL:
1176 case CPLB_NO_ADDR_MATCH:
1178 case CPLB_UNKNOWN_ERR:
1179 printk(KERN_EMERG "Unknown CPLB Exception\n");
1183 oops_in_progress = 1;
1185 dump_bfin_process(fp);
1189 panic("Unrecoverable event\n");