| 1 | /* MN10300 Exception handling |
| 2 | * |
| 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) |
| 6 | * |
| 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. |
| 11 | */ |
| 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> |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/smp.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/kallsyms.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/kdebug.h> |
| 27 | #include <linux/bug.h> |
| 28 | #include <linux/irq.h> |
| 29 | #include <linux/export.h> |
| 30 | #include <asm/processor.h> |
| 31 | #include <linux/uaccess.h> |
| 32 | #include <asm/io.h> |
| 33 | #include <linux/atomic.h> |
| 34 | #include <asm/smp.h> |
| 35 | #include <asm/pgalloc.h> |
| 36 | #include <asm/cacheflush.h> |
| 37 | #include <asm/cpu-regs.h> |
| 38 | #include <asm/busctl-regs.h> |
| 39 | #include <unit/leds.h> |
| 40 | #include <asm/fpu.h> |
| 41 | #include <asm/sections.h> |
| 42 | #include <asm/debugger.h> |
| 43 | #include "internal.h" |
| 44 | |
| 45 | #if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff) |
| 46 | #error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!" |
| 47 | #endif |
| 48 | |
| 49 | int kstack_depth_to_print = 24; |
| 50 | |
| 51 | spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock); |
| 52 | |
| 53 | struct exception_to_signal_map { |
| 54 | u8 signo; |
| 55 | u32 si_code; |
| 56 | }; |
| 57 | |
| 58 | static const struct exception_to_signal_map exception_to_signal_map[256] = { |
| 59 | /* MMU exceptions */ |
| 60 | [EXCEP_ITLBMISS >> 3] = { 0, 0 }, |
| 61 | [EXCEP_DTLBMISS >> 3] = { 0, 0 }, |
| 62 | [EXCEP_IAERROR >> 3] = { 0, 0 }, |
| 63 | [EXCEP_DAERROR >> 3] = { 0, 0 }, |
| 64 | |
| 65 | /* system exceptions */ |
| 66 | [EXCEP_TRAP >> 3] = { SIGTRAP, TRAP_BRKPT }, |
| 67 | [EXCEP_ISTEP >> 3] = { SIGTRAP, TRAP_TRACE }, /* Monitor */ |
| 68 | [EXCEP_IBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT }, /* Monitor */ |
| 69 | [EXCEP_OBREAK >> 3] = { SIGTRAP, TRAP_HWBKPT }, /* Monitor */ |
| 70 | [EXCEP_PRIVINS >> 3] = { SIGILL, ILL_PRVOPC }, |
| 71 | [EXCEP_UNIMPINS >> 3] = { SIGILL, ILL_ILLOPC }, |
| 72 | [EXCEP_UNIMPEXINS >> 3] = { SIGILL, ILL_ILLOPC }, |
| 73 | [EXCEP_MEMERR >> 3] = { SIGSEGV, SEGV_ACCERR }, |
| 74 | [EXCEP_MISALIGN >> 3] = { SIGBUS, BUS_ADRALN }, |
| 75 | [EXCEP_BUSERROR >> 3] = { SIGBUS, BUS_ADRERR }, |
| 76 | [EXCEP_ILLINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, |
| 77 | [EXCEP_ILLDATACC >> 3] = { SIGSEGV, SEGV_ACCERR }, |
| 78 | [EXCEP_IOINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, |
| 79 | [EXCEP_PRIVINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, /* userspace */ |
| 80 | [EXCEP_PRIVDATACC >> 3] = { SIGSEGV, SEGV_ACCERR }, /* userspace */ |
| 81 | [EXCEP_DATINSACC >> 3] = { SIGSEGV, SEGV_ACCERR }, |
| 82 | [EXCEP_DOUBLE_FAULT >> 3] = { SIGILL, ILL_BADSTK }, |
| 83 | |
| 84 | /* FPU exceptions */ |
| 85 | [EXCEP_FPU_DISABLED >> 3] = { SIGILL, ILL_COPROC }, |
| 86 | [EXCEP_FPU_UNIMPINS >> 3] = { SIGILL, ILL_COPROC }, |
| 87 | [EXCEP_FPU_OPERATION >> 3] = { SIGFPE, FPE_INTDIV }, |
| 88 | |
| 89 | /* interrupts */ |
| 90 | [EXCEP_WDT >> 3] = { SIGALRM, 0 }, |
| 91 | [EXCEP_NMI >> 3] = { SIGQUIT, 0 }, |
| 92 | [EXCEP_IRQ_LEVEL0 >> 3] = { SIGINT, 0 }, |
| 93 | [EXCEP_IRQ_LEVEL1 >> 3] = { 0, 0 }, |
| 94 | [EXCEP_IRQ_LEVEL2 >> 3] = { 0, 0 }, |
| 95 | [EXCEP_IRQ_LEVEL3 >> 3] = { 0, 0 }, |
| 96 | [EXCEP_IRQ_LEVEL4 >> 3] = { 0, 0 }, |
| 97 | [EXCEP_IRQ_LEVEL5 >> 3] = { 0, 0 }, |
| 98 | [EXCEP_IRQ_LEVEL6 >> 3] = { 0, 0 }, |
| 99 | |
| 100 | /* system calls */ |
| 101 | [EXCEP_SYSCALL0 >> 3] = { 0, 0 }, |
| 102 | [EXCEP_SYSCALL1 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 103 | [EXCEP_SYSCALL2 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 104 | [EXCEP_SYSCALL3 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 105 | [EXCEP_SYSCALL4 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 106 | [EXCEP_SYSCALL5 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 107 | [EXCEP_SYSCALL6 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 108 | [EXCEP_SYSCALL7 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 109 | [EXCEP_SYSCALL8 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 110 | [EXCEP_SYSCALL9 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 111 | [EXCEP_SYSCALL10 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 112 | [EXCEP_SYSCALL11 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 113 | [EXCEP_SYSCALL12 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 114 | [EXCEP_SYSCALL13 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 115 | [EXCEP_SYSCALL14 >> 3] = { SIGILL, ILL_ILLTRP }, |
| 116 | [EXCEP_SYSCALL15 >> 3] = { SIGABRT, 0 }, |
| 117 | }; |
| 118 | |
| 119 | /* |
| 120 | * Handle kernel exceptions. |
| 121 | * |
| 122 | * See if there's a fixup handler we can force a jump to when an exception |
| 123 | * happens due to something kernel code did |
| 124 | */ |
| 125 | int die_if_no_fixup(const char *str, struct pt_regs *regs, |
| 126 | enum exception_code code) |
| 127 | { |
| 128 | u8 opcode; |
| 129 | int signo, si_code; |
| 130 | |
| 131 | if (user_mode(regs)) |
| 132 | return 0; |
| 133 | |
| 134 | peripheral_leds_display_exception(code); |
| 135 | |
| 136 | signo = exception_to_signal_map[code >> 3].signo; |
| 137 | si_code = exception_to_signal_map[code >> 3].si_code; |
| 138 | |
| 139 | switch (code) { |
| 140 | /* see if we can fixup the kernel accessing memory */ |
| 141 | case EXCEP_ITLBMISS: |
| 142 | case EXCEP_DTLBMISS: |
| 143 | case EXCEP_IAERROR: |
| 144 | case EXCEP_DAERROR: |
| 145 | case EXCEP_MEMERR: |
| 146 | case EXCEP_MISALIGN: |
| 147 | case EXCEP_BUSERROR: |
| 148 | case EXCEP_ILLDATACC: |
| 149 | case EXCEP_IOINSACC: |
| 150 | case EXCEP_PRIVINSACC: |
| 151 | case EXCEP_PRIVDATACC: |
| 152 | case EXCEP_DATINSACC: |
| 153 | if (fixup_exception(regs)) |
| 154 | return 1; |
| 155 | break; |
| 156 | |
| 157 | case EXCEP_TRAP: |
| 158 | case EXCEP_UNIMPINS: |
| 159 | if (probe_kernel_read(&opcode, (u8 *)regs->pc, 1) < 0) |
| 160 | break; |
| 161 | if (opcode == 0xff) { |
| 162 | if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0)) |
| 163 | return 1; |
| 164 | if (at_debugger_breakpoint(regs)) |
| 165 | regs->pc++; |
| 166 | signo = SIGTRAP; |
| 167 | si_code = TRAP_BRKPT; |
| 168 | } |
| 169 | break; |
| 170 | |
| 171 | case EXCEP_SYSCALL1 ... EXCEP_SYSCALL14: |
| 172 | /* syscall return addr is _after_ the instruction */ |
| 173 | regs->pc -= 2; |
| 174 | break; |
| 175 | |
| 176 | case EXCEP_SYSCALL15: |
| 177 | if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_WARN) |
| 178 | return 1; |
| 179 | |
| 180 | /* syscall return addr is _after_ the instruction */ |
| 181 | regs->pc -= 2; |
| 182 | break; |
| 183 | |
| 184 | default: |
| 185 | break; |
| 186 | } |
| 187 | |
| 188 | if (debugger_intercept(code, signo, si_code, regs) == 0) |
| 189 | return 1; |
| 190 | |
| 191 | if (notify_die(DIE_GPF, str, regs, code, 0, 0)) |
| 192 | return 1; |
| 193 | |
| 194 | /* make the process die as the last resort */ |
| 195 | die(str, regs, code); |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * General exception handler |
| 200 | */ |
| 201 | asmlinkage void handle_exception(struct pt_regs *regs, u32 intcode) |
| 202 | { |
| 203 | siginfo_t info; |
| 204 | |
| 205 | /* deal with kernel exceptions here */ |
| 206 | if (die_if_no_fixup(NULL, regs, intcode)) |
| 207 | return; |
| 208 | |
| 209 | /* otherwise it's a userspace exception */ |
| 210 | info.si_signo = exception_to_signal_map[intcode >> 3].signo; |
| 211 | info.si_code = exception_to_signal_map[intcode >> 3].si_code; |
| 212 | info.si_errno = 0; |
| 213 | info.si_addr = (void *) regs->pc; |
| 214 | force_sig_info(info.si_signo, &info, current); |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * handle NMI |
| 219 | */ |
| 220 | asmlinkage void nmi(struct pt_regs *regs, enum exception_code code) |
| 221 | { |
| 222 | /* see if gdbstub wants to deal with it */ |
| 223 | if (debugger_intercept(code, SIGQUIT, 0, regs)) |
| 224 | return; |
| 225 | |
| 226 | printk(KERN_WARNING "--- Register Dump ---\n"); |
| 227 | show_registers(regs); |
| 228 | printk(KERN_WARNING "---------------------\n"); |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * show a stack trace from the specified stack pointer |
| 233 | */ |
| 234 | void show_trace(unsigned long *sp) |
| 235 | { |
| 236 | unsigned long bottom, stack, addr, fp, raslot; |
| 237 | |
| 238 | printk(KERN_EMERG "\nCall Trace:\n"); |
| 239 | |
| 240 | //stack = (unsigned long)sp; |
| 241 | asm("mov sp,%0" : "=a"(stack)); |
| 242 | asm("mov a3,%0" : "=r"(fp)); |
| 243 | |
| 244 | raslot = ULONG_MAX; |
| 245 | bottom = (stack + THREAD_SIZE) & ~(THREAD_SIZE - 1); |
| 246 | for (; stack < bottom; stack += sizeof(addr)) { |
| 247 | addr = *(unsigned long *)stack; |
| 248 | if (stack == fp) { |
| 249 | if (addr > stack && addr < bottom) { |
| 250 | fp = addr; |
| 251 | raslot = stack + sizeof(addr); |
| 252 | continue; |
| 253 | } |
| 254 | fp = 0; |
| 255 | raslot = ULONG_MAX; |
| 256 | } |
| 257 | |
| 258 | if (__kernel_text_address(addr)) { |
| 259 | printk(" [<%08lx>]", addr); |
| 260 | if (stack >= raslot) |
| 261 | raslot = ULONG_MAX; |
| 262 | else |
| 263 | printk(" ?"); |
| 264 | print_symbol(" %s", addr); |
| 265 | printk("\n"); |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | printk("\n"); |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * show the raw stack from the specified stack pointer |
| 274 | */ |
| 275 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 276 | { |
| 277 | unsigned long *stack; |
| 278 | int i; |
| 279 | |
| 280 | if (!sp) |
| 281 | sp = (unsigned long *) &sp; |
| 282 | |
| 283 | stack = sp; |
| 284 | printk(KERN_EMERG "Stack:"); |
| 285 | for (i = 0; i < kstack_depth_to_print; i++) { |
| 286 | if (((long) stack & (THREAD_SIZE - 1)) == 0) |
| 287 | break; |
| 288 | if ((i % 8) == 0) |
| 289 | printk(KERN_EMERG " "); |
| 290 | printk("%08lx ", *stack++); |
| 291 | } |
| 292 | |
| 293 | show_trace(sp); |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * the architecture-independent dump_stack generator |
| 298 | */ |
| 299 | void dump_stack(void) |
| 300 | { |
| 301 | unsigned long stack; |
| 302 | |
| 303 | show_stack(current, &stack); |
| 304 | } |
| 305 | EXPORT_SYMBOL(dump_stack); |
| 306 | |
| 307 | /* |
| 308 | * dump the register file in the specified exception frame |
| 309 | */ |
| 310 | void show_registers_only(struct pt_regs *regs) |
| 311 | { |
| 312 | unsigned long ssp; |
| 313 | |
| 314 | ssp = (unsigned long) regs + sizeof(*regs); |
| 315 | |
| 316 | printk(KERN_EMERG "PC: %08lx EPSW: %08lx SSP: %08lx mode: %s\n", |
| 317 | regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super"); |
| 318 | printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n", |
| 319 | regs->d0, regs->d1, regs->d2, regs->d3); |
| 320 | printk(KERN_EMERG "a0: %08lx a1: %08lx a2: %08lx a3: %08lx\n", |
| 321 | regs->a0, regs->a1, regs->a2, regs->a3); |
| 322 | printk(KERN_EMERG "e0: %08lx e1: %08lx e2: %08lx e3: %08lx\n", |
| 323 | regs->e0, regs->e1, regs->e2, regs->e3); |
| 324 | printk(KERN_EMERG "e4: %08lx e5: %08lx e6: %08lx e7: %08lx\n", |
| 325 | regs->e4, regs->e5, regs->e6, regs->e7); |
| 326 | printk(KERN_EMERG "lar: %08lx lir: %08lx mdr: %08lx usp: %08lx\n", |
| 327 | regs->lar, regs->lir, regs->mdr, regs->sp); |
| 328 | printk(KERN_EMERG "cvf: %08lx crl: %08lx crh: %08lx drq: %08lx\n", |
| 329 | regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq); |
| 330 | printk(KERN_EMERG "threadinfo=%p task=%p)\n", |
| 331 | current_thread_info(), current); |
| 332 | |
| 333 | if ((unsigned long) current >= PAGE_OFFSET && |
| 334 | (unsigned long) current < (unsigned long)high_memory) |
| 335 | printk(KERN_EMERG "Process %s (pid: %d)\n", |
| 336 | current->comm, current->pid); |
| 337 | |
| 338 | #ifdef CONFIG_SMP |
| 339 | printk(KERN_EMERG "CPUID: %08x\n", CPUID); |
| 340 | #endif |
| 341 | printk(KERN_EMERG "CPUP: %04hx\n", CPUP); |
| 342 | printk(KERN_EMERG "TBR: %08x\n", TBR); |
| 343 | printk(KERN_EMERG "DEAR: %08x\n", DEAR); |
| 344 | printk(KERN_EMERG "sISR: %08x\n", sISR); |
| 345 | printk(KERN_EMERG "NMICR: %04hx\n", NMICR); |
| 346 | printk(KERN_EMERG "BCBERR: %08x\n", BCBERR); |
| 347 | printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR); |
| 348 | printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR); |
| 349 | printk(KERN_EMERG "IPTEU : %08x IPTEL2: %08x\n", IPTEU, IPTEL2); |
| 350 | printk(KERN_EMERG "DPTEU: %08x DPTEL2: %08x\n", DPTEU, DPTEL2); |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * dump the registers and the stack |
| 355 | */ |
| 356 | void show_registers(struct pt_regs *regs) |
| 357 | { |
| 358 | unsigned long sp; |
| 359 | int i; |
| 360 | |
| 361 | show_registers_only(regs); |
| 362 | |
| 363 | if (!user_mode(regs)) |
| 364 | sp = (unsigned long) regs + sizeof(*regs); |
| 365 | else |
| 366 | sp = regs->sp; |
| 367 | |
| 368 | /* when in-kernel, we also print out the stack and code at the |
| 369 | * time of the fault.. |
| 370 | */ |
| 371 | if (!user_mode(regs)) { |
| 372 | printk(KERN_EMERG "\n"); |
| 373 | show_stack(current, (unsigned long *) sp); |
| 374 | |
| 375 | #if 0 |
| 376 | printk(KERN_EMERG "\nCode: "); |
| 377 | if (regs->pc < PAGE_OFFSET) |
| 378 | goto bad; |
| 379 | |
| 380 | for (i = 0; i < 20; i++) { |
| 381 | unsigned char c; |
| 382 | if (__get_user(c, &((unsigned char *) regs->pc)[i])) |
| 383 | goto bad; |
| 384 | printk("%02x ", c); |
| 385 | } |
| 386 | #else |
| 387 | i = 0; |
| 388 | #endif |
| 389 | } |
| 390 | |
| 391 | printk("\n"); |
| 392 | return; |
| 393 | |
| 394 | #if 0 |
| 395 | bad: |
| 396 | printk(KERN_EMERG " Bad PC value."); |
| 397 | break; |
| 398 | #endif |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * |
| 403 | */ |
| 404 | void show_trace_task(struct task_struct *tsk) |
| 405 | { |
| 406 | unsigned long sp = tsk->thread.sp; |
| 407 | |
| 408 | /* User space on another CPU? */ |
| 409 | if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1)) |
| 410 | return; |
| 411 | |
| 412 | show_trace((unsigned long *) sp); |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * note the untimely death of part of the kernel |
| 417 | */ |
| 418 | void die(const char *str, struct pt_regs *regs, enum exception_code code) |
| 419 | { |
| 420 | console_verbose(); |
| 421 | spin_lock_irq(&die_lock); |
| 422 | printk(KERN_EMERG "\n%s: %04x\n", |
| 423 | str, code & 0xffff); |
| 424 | show_registers(regs); |
| 425 | |
| 426 | if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 && |
| 427 | (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) { |
| 428 | printk(KERN_EMERG "Exception in usermode interrupt handler\n"); |
| 429 | printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n"); |
| 430 | asm volatile ("0: bra 0b"); |
| 431 | } |
| 432 | |
| 433 | spin_unlock_irq(&die_lock); |
| 434 | do_exit(SIGSEGV); |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * display the register file when the stack pointer gets clobbered |
| 439 | */ |
| 440 | asmlinkage void do_double_fault(struct pt_regs *regs) |
| 441 | { |
| 442 | struct task_struct *tsk = current; |
| 443 | |
| 444 | strcpy(tsk->comm, "emergency tsk"); |
| 445 | tsk->pid = 0; |
| 446 | console_verbose(); |
| 447 | printk(KERN_EMERG "--- double fault ---\n"); |
| 448 | show_registers(regs); |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | * asynchronous bus error (external, usually I/O DMA) |
| 453 | */ |
| 454 | asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs) |
| 455 | { |
| 456 | console_verbose(); |
| 457 | |
| 458 | printk(KERN_EMERG "Asynchronous I/O Bus Error\n"); |
| 459 | printk(KERN_EMERG "==========================\n"); |
| 460 | |
| 461 | if (bcberr & BCBERR_BEME) |
| 462 | printk(KERN_EMERG "- Multiple recorded errors\n"); |
| 463 | |
| 464 | printk(KERN_EMERG "- Faulting Buses:%s%s%s\n", |
| 465 | bcberr & BCBERR_BEMR_CI ? " CPU-Ins-Fetch" : "", |
| 466 | bcberr & BCBERR_BEMR_CD ? " CPU-Data" : "", |
| 467 | bcberr & BCBERR_BEMR_DMA ? " DMA" : ""); |
| 468 | |
| 469 | printk(KERN_EMERG "- %s %s access made to %s at address %08x\n", |
| 470 | bcberr & BCBERR_BEBST ? "Burst" : "Single", |
| 471 | bcberr & BCBERR_BERW ? "Read" : "Write", |
| 472 | bcberr & BCBERR_BESB_MON ? "Monitor Space" : |
| 473 | bcberr & BCBERR_BESB_IO ? "Internal CPU I/O Space" : |
| 474 | bcberr & BCBERR_BESB_EX ? "External I/O Bus" : |
| 475 | bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" : |
| 476 | "On Chip Memory", |
| 477 | bcbear |
| 478 | ); |
| 479 | |
| 480 | printk(KERN_EMERG "- Detected by the %s\n", |
| 481 | bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus"); |
| 482 | |
| 483 | #ifdef CONFIG_PCI |
| 484 | #define BRIDGEREGB(X) (*(volatile __u8 *)(0xBE040000 + (X))) |
| 485 | #define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X))) |
| 486 | #define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X))) |
| 487 | |
| 488 | printk(KERN_EMERG "- PCI Memory Paging Reg: %08x\n", |
| 489 | *(volatile __u32 *) (0xBFFFFFF4)); |
| 490 | printk(KERN_EMERG "- PCI Bridge Base Address 0: %08x\n", |
| 491 | BRIDGEREGL(PCI_BASE_ADDRESS_0)); |
| 492 | printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n", |
| 493 | BRIDGEREGL(0x48)); |
| 494 | printk(KERN_EMERG "- PCI Bridge Command: %04hx\n", |
| 495 | BRIDGEREGW(PCI_COMMAND)); |
| 496 | printk(KERN_EMERG "- PCI Bridge Status: %04hx\n", |
| 497 | BRIDGEREGW(PCI_STATUS)); |
| 498 | printk(KERN_EMERG "- PCI Bridge Int Status: %08hx\n", |
| 499 | BRIDGEREGL(0x4c)); |
| 500 | #endif |
| 501 | |
| 502 | printk(KERN_EMERG "\n"); |
| 503 | show_registers(regs); |
| 504 | |
| 505 | panic("Halted due to asynchronous I/O Bus Error\n"); |
| 506 | } |
| 507 | |
| 508 | /* |
| 509 | * handle an exception for which a handler has not yet been installed |
| 510 | */ |
| 511 | asmlinkage void uninitialised_exception(struct pt_regs *regs, |
| 512 | enum exception_code code) |
| 513 | { |
| 514 | |
| 515 | /* see if gdbstub wants to deal with it */ |
| 516 | if (debugger_intercept(code, SIGSYS, 0, regs) == 0) |
| 517 | return; |
| 518 | |
| 519 | peripheral_leds_display_exception(code); |
| 520 | printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF); |
| 521 | show_registers(regs); |
| 522 | |
| 523 | for (;;) |
| 524 | continue; |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * set an interrupt stub to jump to a handler |
| 529 | * ! NOTE: this does *not* flush the caches |
| 530 | */ |
| 531 | void __init __set_intr_stub(enum exception_code code, void *handler) |
| 532 | { |
| 533 | unsigned long addr; |
| 534 | u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code); |
| 535 | |
| 536 | addr = (unsigned long) handler - (unsigned long) vector; |
| 537 | vector[0] = 0xdc; /* JMP handler */ |
| 538 | vector[1] = addr; |
| 539 | vector[2] = addr >> 8; |
| 540 | vector[3] = addr >> 16; |
| 541 | vector[4] = addr >> 24; |
| 542 | vector[5] = 0xcb; |
| 543 | vector[6] = 0xcb; |
| 544 | vector[7] = 0xcb; |
| 545 | } |
| 546 | |
| 547 | /* |
| 548 | * set an interrupt stub to jump to a handler |
| 549 | */ |
| 550 | void __init set_intr_stub(enum exception_code code, void *handler) |
| 551 | { |
| 552 | unsigned long addr; |
| 553 | u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code); |
| 554 | unsigned long flags; |
| 555 | |
| 556 | addr = (unsigned long) handler - (unsigned long) vector; |
| 557 | |
| 558 | flags = arch_local_cli_save(); |
| 559 | |
| 560 | vector[0] = 0xdc; /* JMP handler */ |
| 561 | vector[1] = addr; |
| 562 | vector[2] = addr >> 8; |
| 563 | vector[3] = addr >> 16; |
| 564 | vector[4] = addr >> 24; |
| 565 | vector[5] = 0xcb; |
| 566 | vector[6] = 0xcb; |
| 567 | vector[7] = 0xcb; |
| 568 | |
| 569 | arch_local_irq_restore(flags); |
| 570 | |
| 571 | #ifndef CONFIG_MN10300_CACHE_SNOOP |
| 572 | mn10300_dcache_flush_inv(); |
| 573 | mn10300_icache_inv(); |
| 574 | #endif |
| 575 | } |
| 576 | |
| 577 | /* |
| 578 | * initialise the exception table |
| 579 | */ |
| 580 | void __init trap_init(void) |
| 581 | { |
| 582 | set_excp_vector(EXCEP_TRAP, handle_exception); |
| 583 | set_excp_vector(EXCEP_ISTEP, handle_exception); |
| 584 | set_excp_vector(EXCEP_IBREAK, handle_exception); |
| 585 | set_excp_vector(EXCEP_OBREAK, handle_exception); |
| 586 | |
| 587 | set_excp_vector(EXCEP_PRIVINS, handle_exception); |
| 588 | set_excp_vector(EXCEP_UNIMPINS, handle_exception); |
| 589 | set_excp_vector(EXCEP_UNIMPEXINS, handle_exception); |
| 590 | set_excp_vector(EXCEP_MEMERR, handle_exception); |
| 591 | set_excp_vector(EXCEP_MISALIGN, misalignment); |
| 592 | set_excp_vector(EXCEP_BUSERROR, handle_exception); |
| 593 | set_excp_vector(EXCEP_ILLINSACC, handle_exception); |
| 594 | set_excp_vector(EXCEP_ILLDATACC, handle_exception); |
| 595 | set_excp_vector(EXCEP_IOINSACC, handle_exception); |
| 596 | set_excp_vector(EXCEP_PRIVINSACC, handle_exception); |
| 597 | set_excp_vector(EXCEP_PRIVDATACC, handle_exception); |
| 598 | set_excp_vector(EXCEP_DATINSACC, handle_exception); |
| 599 | set_excp_vector(EXCEP_FPU_UNIMPINS, handle_exception); |
| 600 | set_excp_vector(EXCEP_FPU_OPERATION, fpu_exception); |
| 601 | |
| 602 | set_excp_vector(EXCEP_NMI, nmi); |
| 603 | |
| 604 | set_excp_vector(EXCEP_SYSCALL1, handle_exception); |
| 605 | set_excp_vector(EXCEP_SYSCALL2, handle_exception); |
| 606 | set_excp_vector(EXCEP_SYSCALL3, handle_exception); |
| 607 | set_excp_vector(EXCEP_SYSCALL4, handle_exception); |
| 608 | set_excp_vector(EXCEP_SYSCALL5, handle_exception); |
| 609 | set_excp_vector(EXCEP_SYSCALL6, handle_exception); |
| 610 | set_excp_vector(EXCEP_SYSCALL7, handle_exception); |
| 611 | set_excp_vector(EXCEP_SYSCALL8, handle_exception); |
| 612 | set_excp_vector(EXCEP_SYSCALL9, handle_exception); |
| 613 | set_excp_vector(EXCEP_SYSCALL10, handle_exception); |
| 614 | set_excp_vector(EXCEP_SYSCALL11, handle_exception); |
| 615 | set_excp_vector(EXCEP_SYSCALL12, handle_exception); |
| 616 | set_excp_vector(EXCEP_SYSCALL13, handle_exception); |
| 617 | set_excp_vector(EXCEP_SYSCALL14, handle_exception); |
| 618 | set_excp_vector(EXCEP_SYSCALL15, handle_exception); |
| 619 | } |
| 620 | |
| 621 | /* |
| 622 | * determine if a program counter value is a valid bug address |
| 623 | */ |
| 624 | int is_valid_bugaddr(unsigned long pc) |
| 625 | { |
| 626 | return pc >= PAGE_OFFSET; |
| 627 | } |