1 /* MN10300 Exception handling
3 * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Modified by David Howells (dhowells@redhat.com)
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public Licence
9 * as published by the Free Software Foundation; either version
10 * 2 of the Licence, or (at your option) any later version.
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/errno.h>
16 #include <linux/ptrace.h>
17 #include <linux/timer.h>
19 #include <linux/smp.h>
20 #include <linux/smp_lock.h>
21 #include <linux/init.h>
22 #include <linux/delay.h>
23 #include <linux/spinlock.h>
24 #include <linux/interrupt.h>
25 #include <linux/kallsyms.h>
26 #include <linux/pci.h>
27 #include <linux/kdebug.h>
28 #include <linux/bug.h>
29 #include <linux/irq.h>
30 #include <asm/processor.h>
31 #include <asm/system.h>
32 #include <asm/uaccess.h>
34 #include <asm/atomic.h>
36 #include <asm/pgalloc.h>
37 #include <asm/cacheflush.h>
38 #include <asm/cpu-regs.h>
39 #include <asm/busctl-regs.h>
40 #include <unit/leds.h>
42 #include <asm/gdb-stub.h>
43 #include <asm/sections.h>
45 #if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
46 #error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
49 struct pt_regs *__frame; /* current frame pointer */
50 EXPORT_SYMBOL(__frame);
52 int kstack_depth_to_print = 24;
54 spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);
56 ATOMIC_NOTIFIER_HEAD(mn10300_die_chain);
59 * These constants are for searching for possible module text
60 * segments. MODULE_RANGE is a guess of how much space is likely
63 #define MODULE_RANGE (8 * 1024 * 1024)
65 #define DO_ERROR(signr, prologue, str, name) \
66 asmlinkage void name(struct pt_regs *regs, u32 intcode) \
69 if (die_if_no_fixup(str, regs, intcode)) \
71 force_sig(signr, current); \
74 #define DO_EINFO(signr, prologue, str, name, sicode) \
75 asmlinkage void name(struct pt_regs *regs, u32 intcode) \
79 if (die_if_no_fixup(str, regs, intcode)) \
81 info.si_signo = signr; \
82 if (signr == SIGILL && sicode == ILL_ILLOPC) { \
84 if (get_user(opcode, (uint8_t __user *)regs->pc) == 0) \
86 info.si_signo = SIGTRAP; \
89 info.si_code = sicode; \
90 info.si_addr = (void *) regs->pc; \
91 force_sig_info(info.si_signo, &info, current); \
94 DO_ERROR(SIGTRAP, {}, "trap", trap);
95 DO_ERROR(SIGSEGV, {}, "ibreak", ibreak);
96 DO_ERROR(SIGSEGV, {}, "obreak", obreak);
97 DO_EINFO(SIGSEGV, {}, "access error", access_error, SEGV_ACCERR);
98 DO_EINFO(SIGSEGV, {}, "insn access error", insn_acc_error, SEGV_ACCERR);
99 DO_EINFO(SIGSEGV, {}, "data access error", data_acc_error, SEGV_ACCERR);
100 DO_EINFO(SIGILL, {}, "privileged opcode", priv_op, ILL_PRVOPC);
101 DO_EINFO(SIGILL, {}, "invalid opcode", invalid_op, ILL_ILLOPC);
102 DO_EINFO(SIGILL, {}, "invalid ex opcode", invalid_exop, ILL_ILLOPC);
103 DO_EINFO(SIGBUS, {}, "invalid address", mem_error, BUS_ADRERR);
104 DO_EINFO(SIGBUS, {}, "bus error", bus_error, BUS_ADRERR);
105 DO_EINFO(SIGILL, {}, "FPU invalid opcode", fpu_invalid_op, ILL_COPROC);
108 #ifndef CONFIG_MN10300_USING_JTAG
113 "single step", istep);
118 asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
120 /* see if gdbstub wants to deal with it */
121 #ifdef CONFIG_GDBSTUB
122 if (gdbstub_intercept(regs, code))
126 printk(KERN_WARNING "--- Register Dump ---\n");
127 show_registers(regs);
128 printk(KERN_WARNING "---------------------\n");
132 * show a stack trace from the specified stack pointer
134 void show_trace(unsigned long *sp)
136 unsigned long *stack, addr, module_start, module_end;
139 printk(KERN_EMERG "\nCall Trace:");
143 module_start = VMALLOC_START;
144 module_end = VMALLOC_END;
146 while (((long) stack & (THREAD_SIZE - 1)) != 0) {
148 if (__kernel_text_address(addr)) {
150 printk(" [<%08lx>]", addr);
151 print_symbol(" %s", addr);
155 printk(KERN_EMERG " ");
156 printk("[<%08lx>] ", addr);
166 * show the raw stack from the specified stack pointer
168 void show_stack(struct task_struct *task, unsigned long *sp)
170 unsigned long *stack;
174 sp = (unsigned long *) &sp;
177 printk(KERN_EMERG "Stack:");
178 for (i = 0; i < kstack_depth_to_print; i++) {
179 if (((long) stack & (THREAD_SIZE - 1)) == 0)
182 printk(KERN_EMERG " ");
183 printk("%08lx ", *stack++);
190 * the architecture-independent dump_stack generator
192 void dump_stack(void)
196 show_stack(current, &stack);
198 EXPORT_SYMBOL(dump_stack);
201 * dump the register file in the specified exception frame
203 void show_registers_only(struct pt_regs *regs)
207 ssp = (unsigned long) regs + sizeof(*regs);
209 printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n",
210 regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
211 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
212 regs->d0, regs->d1, regs->d2, regs->d3);
213 printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n",
214 regs->a0, regs->a1, regs->a2, regs->a3);
215 printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n",
216 regs->e0, regs->e1, regs->e2, regs->e3);
217 printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n",
218 regs->e4, regs->e5, regs->e6, regs->e7);
219 printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n",
220 regs->lar, regs->lir, regs->mdr, regs->sp);
221 printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n",
222 regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
223 printk(KERN_EMERG "threadinfo=%p task=%p)\n",
224 current_thread_info(), current);
226 if ((unsigned long) current >= 0x90000000UL &&
227 (unsigned long) current < 0x94000000UL)
228 printk(KERN_EMERG "Process %s (pid: %d)\n",
229 current->comm, current->pid);
231 printk(KERN_EMERG "CPUP: %04hx\n", CPUP);
232 printk(KERN_EMERG "TBR: %08x\n", TBR);
233 printk(KERN_EMERG "DEAR: %08x\n", DEAR);
234 printk(KERN_EMERG "sISR: %08x\n", sISR);
235 printk(KERN_EMERG "NMICR: %04hx\n", NMICR);
236 printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
237 printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
238 printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
239 printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2);
240 printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2);
244 * dump the registers and the stack
246 void show_registers(struct pt_regs *regs)
251 show_registers_only(regs);
253 if (!user_mode(regs))
254 sp = (unsigned long) regs + sizeof(*regs);
258 /* when in-kernel, we also print out the stack and code at the
259 * time of the fault..
261 if (!user_mode(regs)) {
262 printk(KERN_EMERG "\n");
263 show_stack(current, (unsigned long *) sp);
266 printk(KERN_EMERG "\nCode: ");
267 if (regs->pc < PAGE_OFFSET)
270 for (i = 0; i < 20; i++) {
272 if (__get_user(c, &((unsigned char *) regs->pc)[i]))
286 printk(KERN_EMERG " Bad PC value.");
294 void show_trace_task(struct task_struct *tsk)
296 unsigned long sp = tsk->thread.sp;
298 /* User space on another CPU? */
299 if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
302 show_trace((unsigned long *) sp);
306 * note the untimely death of part of the kernel
308 void die(const char *str, struct pt_regs *regs, enum exception_code code)
311 spin_lock_irq(&die_lock);
312 printk(KERN_EMERG "\n%s: %04x\n",
314 show_registers(regs);
316 if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
317 (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
318 printk(KERN_EMERG "Exception in usermode interrupt handler\n");
319 printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
320 asm volatile ("0: bra 0b");
323 spin_unlock_irq(&die_lock);
328 * see if there's a fixup handler we can force a jump to when an exception
329 * happens due to something kernel code did
331 int die_if_no_fixup(const char *str, struct pt_regs *regs,
332 enum exception_code code)
337 peripheral_leds_display_exception(code);
340 /* see if we can fixup the kernel accessing memory */
348 case EXCEP_ILLDATACC:
350 case EXCEP_PRIVINSACC:
351 case EXCEP_PRIVDATACC:
352 case EXCEP_DATINSACC:
353 if (fixup_exception(regs))
356 if (regs->pc && *(uint8_t *)regs->pc == 0xff)
357 if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
364 /* see if gdbstub wants to deal with it */
365 #ifdef CONFIG_GDBSTUB
366 if (gdbstub_intercept(regs, code))
370 if (notify_die(DIE_GPF, str, regs, code, 0, 0))
373 /* make the process die as the last resort */
374 die(str, regs, code);
378 * handle unsupported syscall instructions (syscall 1-15)
380 static asmlinkage void unsupported_syscall(struct pt_regs *regs,
381 enum exception_code code)
383 struct task_struct *tsk = current;
386 /* catch a kernel BUG() */
387 if (code == EXCEP_SYSCALL15 && !user_mode(regs)) {
388 if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_BUG) {
389 #ifdef CONFIG_GDBSTUB
390 gdbstub_intercept(regs, code);
395 regs->pc -= 2; /* syscall return addr is _after_ the instruction */
397 die_if_no_fixup("An unsupported syscall insn was used by the kernel\n",
400 info.si_signo = SIGILL;
401 info.si_errno = ENOSYS;
402 info.si_code = ILL_ILLTRP;
403 info.si_addr = (void *) regs->pc;
404 force_sig_info(SIGILL, &info, tsk);
408 * display the register file when the stack pointer gets clobbered
410 asmlinkage void do_double_fault(struct pt_regs *regs)
412 struct task_struct *tsk = current;
414 strcpy(tsk->comm, "emergency tsk");
417 printk(KERN_EMERG "--- double fault ---\n");
418 show_registers(regs);
422 * asynchronous bus error (external, usually I/O DMA)
424 asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
428 printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
429 printk(KERN_EMERG "==========================\n");
431 if (bcberr & BCBERR_BEME)
432 printk(KERN_EMERG "- Multiple recorded errors\n");
434 printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
435 bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "",
436 bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "",
437 bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
439 printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
440 bcberr & BCBERR_BEBST ? "Burst" : "Single",
441 bcberr & BCBERR_BERW ? "Read" : "Write",
442 bcberr & BCBERR_BESB_MON ? "Monitor Space" :
443 bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" :
444 bcberr & BCBERR_BESB_EX ? "External I/O Bus" :
445 bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
450 printk(KERN_EMERG "- Detected by the %s\n",
451 bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
454 #define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X)))
455 #define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
456 #define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
458 printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n",
459 *(volatile __u32 *) (0xBFFFFFF4));
460 printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n",
461 BRIDGEREGL(PCI_BASE_ADDRESS_0));
462 printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
464 printk(KERN_EMERG "- PCI Bridge Command: %04hx\n",
465 BRIDGEREGW(PCI_COMMAND));
466 printk(KERN_EMERG "- PCI Bridge Status: %04hx\n",
467 BRIDGEREGW(PCI_STATUS));
468 printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n",
472 printk(KERN_EMERG "\n");
473 show_registers(regs);
475 panic("Halted due to asynchronous I/O Bus Error\n");
479 * handle an exception for which a handler has not yet been installed
481 asmlinkage void uninitialised_exception(struct pt_regs *regs,
482 enum exception_code code)
485 /* see if gdbstub wants to deal with it */
486 #ifdef CONFIG_GDBSTUB
487 if (gdbstub_intercept(regs, code))
491 peripheral_leds_display_exception(code);
492 printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
493 show_registers(regs);
500 * set an interrupt stub to jump to a handler
501 * ! NOTE: this does *not* flush the caches
503 void __init __set_intr_stub(enum exception_code code, void *handler)
506 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
508 addr = (unsigned long) handler - (unsigned long) vector;
509 vector[0] = 0xdc; /* JMP handler */
511 vector[2] = addr >> 8;
512 vector[3] = addr >> 16;
513 vector[4] = addr >> 24;
520 * set an interrupt stub to jump to a handler
522 void __init set_intr_stub(enum exception_code code, void *handler)
525 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
527 addr = (unsigned long) handler - (unsigned long) vector;
528 vector[0] = 0xdc; /* JMP handler */
530 vector[2] = addr >> 8;
531 vector[3] = addr >> 16;
532 vector[4] = addr >> 24;
537 mn10300_dcache_flush_inv();
538 mn10300_icache_inv();
542 * set an interrupt stub to invoke the JTAG unit and then jump to a handler
544 void __init set_jtag_stub(enum exception_code code, void *handler)
547 u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
549 addr = (unsigned long) handler - ((unsigned long) vector + 1);
550 vector[0] = 0xff; /* PI to jump into JTAG debugger */
551 vector[1] = 0xdc; /* jmp handler */
553 vector[3] = addr >> 8;
554 vector[4] = addr >> 16;
555 vector[5] = addr >> 24;
559 mn10300_dcache_flush_inv();
560 flush_icache_range((unsigned long) vector, (unsigned long) vector + 8);
564 * initialise the exception table
566 void __init trap_init(void)
568 set_excp_vector(EXCEP_TRAP, trap);
569 set_excp_vector(EXCEP_ISTEP, istep);
570 set_excp_vector(EXCEP_IBREAK, ibreak);
571 set_excp_vector(EXCEP_OBREAK, obreak);
573 set_excp_vector(EXCEP_PRIVINS, priv_op);
574 set_excp_vector(EXCEP_UNIMPINS, invalid_op);
575 set_excp_vector(EXCEP_UNIMPEXINS, invalid_exop);
576 set_excp_vector(EXCEP_MEMERR, mem_error);
577 set_excp_vector(EXCEP_MISALIGN, misalignment);
578 set_excp_vector(EXCEP_BUSERROR, bus_error);
579 set_excp_vector(EXCEP_ILLINSACC, insn_acc_error);
580 set_excp_vector(EXCEP_ILLDATACC, data_acc_error);
581 set_excp_vector(EXCEP_IOINSACC, insn_acc_error);
582 set_excp_vector(EXCEP_PRIVINSACC, insn_acc_error);
583 set_excp_vector(EXCEP_PRIVDATACC, data_acc_error);
584 set_excp_vector(EXCEP_DATINSACC, insn_acc_error);
585 set_excp_vector(EXCEP_FPU_DISABLED, fpu_disabled);
586 set_excp_vector(EXCEP_FPU_UNIMPINS, fpu_invalid_op);
587 set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception);
589 set_excp_vector(EXCEP_NMI, nmi);
591 set_excp_vector(EXCEP_SYSCALL1, unsupported_syscall);
592 set_excp_vector(EXCEP_SYSCALL2, unsupported_syscall);
593 set_excp_vector(EXCEP_SYSCALL3, unsupported_syscall);
594 set_excp_vector(EXCEP_SYSCALL4, unsupported_syscall);
595 set_excp_vector(EXCEP_SYSCALL5, unsupported_syscall);
596 set_excp_vector(EXCEP_SYSCALL6, unsupported_syscall);
597 set_excp_vector(EXCEP_SYSCALL7, unsupported_syscall);
598 set_excp_vector(EXCEP_SYSCALL8, unsupported_syscall);
599 set_excp_vector(EXCEP_SYSCALL9, unsupported_syscall);
600 set_excp_vector(EXCEP_SYSCALL10, unsupported_syscall);
601 set_excp_vector(EXCEP_SYSCALL11, unsupported_syscall);
602 set_excp_vector(EXCEP_SYSCALL12, unsupported_syscall);
603 set_excp_vector(EXCEP_SYSCALL13, unsupported_syscall);
604 set_excp_vector(EXCEP_SYSCALL14, unsupported_syscall);
605 set_excp_vector(EXCEP_SYSCALL15, unsupported_syscall);
609 * determine if a program counter value is a valid bug address
611 int is_valid_bugaddr(unsigned long pc)
613 return pc >= PAGE_OFFSET;