| 1 | /* |
| 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 3 | * |
| 4 | * Pentium III FXSR, SSE support |
| 5 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
| 6 | */ |
| 7 | |
| 8 | /* |
| 9 | * 'Traps.c' handles hardware traps and faults after we have saved some |
| 10 | * state in 'asm.s'. |
| 11 | */ |
| 12 | #include <linux/sched.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/string.h> |
| 15 | #include <linux/errno.h> |
| 16 | #include <linux/timer.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/delay.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/highmem.h> |
| 23 | #include <linux/kallsyms.h> |
| 24 | #include <linux/ptrace.h> |
| 25 | #include <linux/utsname.h> |
| 26 | #include <linux/kprobes.h> |
| 27 | #include <linux/kexec.h> |
| 28 | #include <linux/unwind.h> |
| 29 | #include <linux/uaccess.h> |
| 30 | #include <linux/nmi.h> |
| 31 | #include <linux/bug.h> |
| 32 | |
| 33 | #ifdef CONFIG_EISA |
| 34 | #include <linux/ioport.h> |
| 35 | #include <linux/eisa.h> |
| 36 | #endif |
| 37 | |
| 38 | #ifdef CONFIG_MCA |
| 39 | #include <linux/mca.h> |
| 40 | #endif |
| 41 | |
| 42 | #if defined(CONFIG_EDAC) |
| 43 | #include <linux/edac.h> |
| 44 | #endif |
| 45 | |
| 46 | #include <asm/processor.h> |
| 47 | #include <asm/system.h> |
| 48 | #include <asm/io.h> |
| 49 | #include <asm/atomic.h> |
| 50 | #include <asm/debugreg.h> |
| 51 | #include <asm/desc.h> |
| 52 | #include <asm/i387.h> |
| 53 | #include <asm/nmi.h> |
| 54 | #include <asm/unwind.h> |
| 55 | #include <asm/smp.h> |
| 56 | #include <asm/arch_hooks.h> |
| 57 | #include <linux/kdebug.h> |
| 58 | #include <asm/stacktrace.h> |
| 59 | |
| 60 | #include <linux/module.h> |
| 61 | |
| 62 | #include "mach_traps.h" |
| 63 | |
| 64 | int panic_on_unrecovered_nmi; |
| 65 | |
| 66 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
| 67 | EXPORT_SYMBOL_GPL(used_vectors); |
| 68 | |
| 69 | asmlinkage int system_call(void); |
| 70 | |
| 71 | /* Do we ignore FPU interrupts ? */ |
| 72 | char ignore_fpu_irq = 0; |
| 73 | |
| 74 | /* |
| 75 | * The IDT has to be page-aligned to simplify the Pentium |
| 76 | * F0 0F bug workaround.. We have a special link segment |
| 77 | * for this. |
| 78 | */ |
| 79 | gate_desc idt_table[256] |
| 80 | __attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, }; |
| 81 | |
| 82 | asmlinkage void divide_error(void); |
| 83 | asmlinkage void debug(void); |
| 84 | asmlinkage void nmi(void); |
| 85 | asmlinkage void int3(void); |
| 86 | asmlinkage void overflow(void); |
| 87 | asmlinkage void bounds(void); |
| 88 | asmlinkage void invalid_op(void); |
| 89 | asmlinkage void device_not_available(void); |
| 90 | asmlinkage void coprocessor_segment_overrun(void); |
| 91 | asmlinkage void invalid_TSS(void); |
| 92 | asmlinkage void segment_not_present(void); |
| 93 | asmlinkage void stack_segment(void); |
| 94 | asmlinkage void general_protection(void); |
| 95 | asmlinkage void page_fault(void); |
| 96 | asmlinkage void coprocessor_error(void); |
| 97 | asmlinkage void simd_coprocessor_error(void); |
| 98 | asmlinkage void alignment_check(void); |
| 99 | asmlinkage void spurious_interrupt_bug(void); |
| 100 | asmlinkage void machine_check(void); |
| 101 | |
| 102 | int kstack_depth_to_print = 24; |
| 103 | static unsigned int code_bytes = 64; |
| 104 | |
| 105 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p, unsigned size) |
| 106 | { |
| 107 | return p > (void *)tinfo && |
| 108 | p <= (void *)tinfo + THREAD_SIZE - size; |
| 109 | } |
| 110 | |
| 111 | /* The form of the top of the frame on the stack */ |
| 112 | struct stack_frame { |
| 113 | struct stack_frame *next_frame; |
| 114 | unsigned long return_address; |
| 115 | }; |
| 116 | |
| 117 | static inline unsigned long print_context_stack(struct thread_info *tinfo, |
| 118 | unsigned long *stack, unsigned long bp, |
| 119 | const struct stacktrace_ops *ops, void *data) |
| 120 | { |
| 121 | #ifdef CONFIG_FRAME_POINTER |
| 122 | struct stack_frame *frame = (struct stack_frame *)bp; |
| 123 | while (valid_stack_ptr(tinfo, frame, sizeof(*frame))) { |
| 124 | struct stack_frame *next; |
| 125 | unsigned long addr; |
| 126 | |
| 127 | addr = frame->return_address; |
| 128 | ops->address(data, addr); |
| 129 | /* |
| 130 | * break out of recursive entries (such as |
| 131 | * end_of_stack_stop_unwind_function). Also, |
| 132 | * we can never allow a frame pointer to |
| 133 | * move downwards! |
| 134 | */ |
| 135 | next = frame->next_frame; |
| 136 | if (next <= frame) |
| 137 | break; |
| 138 | frame = next; |
| 139 | } |
| 140 | #else |
| 141 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack))) { |
| 142 | unsigned long addr; |
| 143 | |
| 144 | addr = *stack++; |
| 145 | if (__kernel_text_address(addr)) |
| 146 | ops->address(data, addr); |
| 147 | } |
| 148 | #endif |
| 149 | return bp; |
| 150 | } |
| 151 | |
| 152 | #define MSG(msg) ops->warning(data, msg) |
| 153 | |
| 154 | void dump_trace(struct task_struct *task, struct pt_regs *regs, |
| 155 | unsigned long *stack, |
| 156 | const struct stacktrace_ops *ops, void *data) |
| 157 | { |
| 158 | unsigned long bp = 0; |
| 159 | |
| 160 | if (!task) |
| 161 | task = current; |
| 162 | |
| 163 | if (!stack) { |
| 164 | unsigned long dummy; |
| 165 | stack = &dummy; |
| 166 | if (task != current) |
| 167 | stack = (unsigned long *)task->thread.sp; |
| 168 | } |
| 169 | |
| 170 | #ifdef CONFIG_FRAME_POINTER |
| 171 | if (!bp) { |
| 172 | if (task == current) { |
| 173 | /* Grab bp right from our regs */ |
| 174 | asm ("movl %%ebp, %0" : "=r" (bp) : ); |
| 175 | } else { |
| 176 | /* bp is the last reg pushed by switch_to */ |
| 177 | bp = *(unsigned long *) task->thread.sp; |
| 178 | } |
| 179 | } |
| 180 | #endif |
| 181 | |
| 182 | while (1) { |
| 183 | struct thread_info *context; |
| 184 | context = (struct thread_info *) |
| 185 | ((unsigned long)stack & (~(THREAD_SIZE - 1))); |
| 186 | bp = print_context_stack(context, stack, bp, ops, data); |
| 187 | /* Should be after the line below, but somewhere |
| 188 | in early boot context comes out corrupted and we |
| 189 | can't reference it -AK */ |
| 190 | if (ops->stack(data, "IRQ") < 0) |
| 191 | break; |
| 192 | stack = (unsigned long*)context->previous_esp; |
| 193 | if (!stack) |
| 194 | break; |
| 195 | touch_nmi_watchdog(); |
| 196 | } |
| 197 | } |
| 198 | EXPORT_SYMBOL(dump_trace); |
| 199 | |
| 200 | static void |
| 201 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) |
| 202 | { |
| 203 | printk(data); |
| 204 | print_symbol(msg, symbol); |
| 205 | printk("\n"); |
| 206 | } |
| 207 | |
| 208 | static void print_trace_warning(void *data, char *msg) |
| 209 | { |
| 210 | printk("%s%s\n", (char *)data, msg); |
| 211 | } |
| 212 | |
| 213 | static int print_trace_stack(void *data, char *name) |
| 214 | { |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Print one address/symbol entries per line. |
| 220 | */ |
| 221 | static void print_trace_address(void *data, unsigned long addr) |
| 222 | { |
| 223 | printk("%s [<%08lx>] ", (char *)data, addr); |
| 224 | print_symbol("%s\n", addr); |
| 225 | touch_nmi_watchdog(); |
| 226 | } |
| 227 | |
| 228 | static const struct stacktrace_ops print_trace_ops = { |
| 229 | .warning = print_trace_warning, |
| 230 | .warning_symbol = print_trace_warning_symbol, |
| 231 | .stack = print_trace_stack, |
| 232 | .address = print_trace_address, |
| 233 | }; |
| 234 | |
| 235 | static void |
| 236 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, |
| 237 | unsigned long * stack, char *log_lvl) |
| 238 | { |
| 239 | dump_trace(task, regs, stack, &print_trace_ops, log_lvl); |
| 240 | printk("%s =======================\n", log_lvl); |
| 241 | } |
| 242 | |
| 243 | void show_trace(struct task_struct *task, struct pt_regs *regs, |
| 244 | unsigned long * stack) |
| 245 | { |
| 246 | show_trace_log_lvl(task, regs, stack, ""); |
| 247 | } |
| 248 | |
| 249 | static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, |
| 250 | unsigned long *sp, char *log_lvl) |
| 251 | { |
| 252 | unsigned long *stack; |
| 253 | int i; |
| 254 | |
| 255 | if (sp == NULL) { |
| 256 | if (task) |
| 257 | sp = (unsigned long*)task->thread.sp; |
| 258 | else |
| 259 | sp = (unsigned long *)&sp; |
| 260 | } |
| 261 | |
| 262 | stack = sp; |
| 263 | for(i = 0; i < kstack_depth_to_print; i++) { |
| 264 | if (kstack_end(stack)) |
| 265 | break; |
| 266 | if (i && ((i % 8) == 0)) |
| 267 | printk("\n%s ", log_lvl); |
| 268 | printk("%08lx ", *stack++); |
| 269 | } |
| 270 | printk("\n%sCall Trace:\n", log_lvl); |
| 271 | show_trace_log_lvl(task, regs, sp, log_lvl); |
| 272 | } |
| 273 | |
| 274 | void show_stack(struct task_struct *task, unsigned long *sp) |
| 275 | { |
| 276 | printk(" "); |
| 277 | show_stack_log_lvl(task, NULL, sp, ""); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * The architecture-independent dump_stack generator |
| 282 | */ |
| 283 | void dump_stack(void) |
| 284 | { |
| 285 | unsigned long stack; |
| 286 | |
| 287 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
| 288 | current->pid, current->comm, print_tainted(), |
| 289 | init_utsname()->release, |
| 290 | (int)strcspn(init_utsname()->version, " "), |
| 291 | init_utsname()->version); |
| 292 | show_trace(current, NULL, &stack); |
| 293 | } |
| 294 | |
| 295 | EXPORT_SYMBOL(dump_stack); |
| 296 | |
| 297 | void show_registers(struct pt_regs *regs) |
| 298 | { |
| 299 | int i; |
| 300 | |
| 301 | print_modules(); |
| 302 | __show_registers(regs, 0); |
| 303 | printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)", |
| 304 | TASK_COMM_LEN, current->comm, task_pid_nr(current), |
| 305 | current_thread_info(), current, task_thread_info(current)); |
| 306 | /* |
| 307 | * When in-kernel, we also print out the stack and code at the |
| 308 | * time of the fault.. |
| 309 | */ |
| 310 | if (!user_mode_vm(regs)) { |
| 311 | u8 *ip; |
| 312 | unsigned int code_prologue = code_bytes * 43 / 64; |
| 313 | unsigned int code_len = code_bytes; |
| 314 | unsigned char c; |
| 315 | |
| 316 | printk("\n" KERN_EMERG "Stack: "); |
| 317 | show_stack_log_lvl(NULL, regs, ®s->sp, KERN_EMERG); |
| 318 | |
| 319 | printk(KERN_EMERG "Code: "); |
| 320 | |
| 321 | ip = (u8 *)regs->ip - code_prologue; |
| 322 | if (ip < (u8 *)PAGE_OFFSET || |
| 323 | probe_kernel_address(ip, c)) { |
| 324 | /* try starting at EIP */ |
| 325 | ip = (u8 *)regs->ip; |
| 326 | code_len = code_len - code_prologue + 1; |
| 327 | } |
| 328 | for (i = 0; i < code_len; i++, ip++) { |
| 329 | if (ip < (u8 *)PAGE_OFFSET || |
| 330 | probe_kernel_address(ip, c)) { |
| 331 | printk(" Bad EIP value."); |
| 332 | break; |
| 333 | } |
| 334 | if (ip == (u8 *)regs->ip) |
| 335 | printk("<%02x> ", c); |
| 336 | else |
| 337 | printk("%02x ", c); |
| 338 | } |
| 339 | } |
| 340 | printk("\n"); |
| 341 | } |
| 342 | |
| 343 | int is_valid_bugaddr(unsigned long ip) |
| 344 | { |
| 345 | unsigned short ud2; |
| 346 | |
| 347 | if (ip < PAGE_OFFSET) |
| 348 | return 0; |
| 349 | if (probe_kernel_address((unsigned short *)ip, ud2)) |
| 350 | return 0; |
| 351 | |
| 352 | return ud2 == 0x0b0f; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * This is gone through when something in the kernel has done something bad and |
| 357 | * is about to be terminated. |
| 358 | */ |
| 359 | void die(const char * str, struct pt_regs * regs, long err) |
| 360 | { |
| 361 | static struct { |
| 362 | raw_spinlock_t lock; |
| 363 | u32 lock_owner; |
| 364 | int lock_owner_depth; |
| 365 | } die = { |
| 366 | .lock = __RAW_SPIN_LOCK_UNLOCKED, |
| 367 | .lock_owner = -1, |
| 368 | .lock_owner_depth = 0 |
| 369 | }; |
| 370 | static int die_counter; |
| 371 | unsigned long flags; |
| 372 | |
| 373 | oops_enter(); |
| 374 | |
| 375 | if (die.lock_owner != raw_smp_processor_id()) { |
| 376 | console_verbose(); |
| 377 | raw_local_irq_save(flags); |
| 378 | __raw_spin_lock(&die.lock); |
| 379 | die.lock_owner = smp_processor_id(); |
| 380 | die.lock_owner_depth = 0; |
| 381 | bust_spinlocks(1); |
| 382 | } else |
| 383 | raw_local_irq_save(flags); |
| 384 | |
| 385 | if (++die.lock_owner_depth < 3) { |
| 386 | unsigned long sp; |
| 387 | unsigned short ss; |
| 388 | |
| 389 | report_bug(regs->ip, regs); |
| 390 | |
| 391 | printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, |
| 392 | ++die_counter); |
| 393 | #ifdef CONFIG_PREEMPT |
| 394 | printk("PREEMPT "); |
| 395 | #endif |
| 396 | #ifdef CONFIG_SMP |
| 397 | printk("SMP "); |
| 398 | #endif |
| 399 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 400 | printk("DEBUG_PAGEALLOC"); |
| 401 | #endif |
| 402 | printk("\n"); |
| 403 | |
| 404 | if (notify_die(DIE_OOPS, str, regs, err, |
| 405 | current->thread.trap_no, SIGSEGV) != |
| 406 | NOTIFY_STOP) { |
| 407 | show_registers(regs); |
| 408 | /* Executive summary in case the oops scrolled away */ |
| 409 | sp = (unsigned long) (®s->sp); |
| 410 | savesegment(ss, ss); |
| 411 | if (user_mode(regs)) { |
| 412 | sp = regs->sp; |
| 413 | ss = regs->ss & 0xffff; |
| 414 | } |
| 415 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip); |
| 416 | print_symbol("%s", regs->ip); |
| 417 | printk(" SS:ESP %04x:%08lx\n", ss, sp); |
| 418 | } |
| 419 | else |
| 420 | regs = NULL; |
| 421 | } else |
| 422 | printk(KERN_EMERG "Recursive die() failure, output suppressed\n"); |
| 423 | |
| 424 | bust_spinlocks(0); |
| 425 | die.lock_owner = -1; |
| 426 | add_taint(TAINT_DIE); |
| 427 | __raw_spin_unlock(&die.lock); |
| 428 | raw_local_irq_restore(flags); |
| 429 | |
| 430 | if (!regs) |
| 431 | return; |
| 432 | |
| 433 | if (kexec_should_crash(current)) |
| 434 | crash_kexec(regs); |
| 435 | |
| 436 | if (in_interrupt()) |
| 437 | panic("Fatal exception in interrupt"); |
| 438 | |
| 439 | if (panic_on_oops) |
| 440 | panic("Fatal exception"); |
| 441 | |
| 442 | oops_exit(); |
| 443 | do_exit(SIGSEGV); |
| 444 | } |
| 445 | |
| 446 | static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err) |
| 447 | { |
| 448 | if (!user_mode_vm(regs)) |
| 449 | die(str, regs, err); |
| 450 | } |
| 451 | |
| 452 | static void __kprobes do_trap(int trapnr, int signr, char *str, int vm86, |
| 453 | struct pt_regs * regs, long error_code, |
| 454 | siginfo_t *info) |
| 455 | { |
| 456 | struct task_struct *tsk = current; |
| 457 | |
| 458 | if (regs->flags & VM_MASK) { |
| 459 | if (vm86) |
| 460 | goto vm86_trap; |
| 461 | goto trap_signal; |
| 462 | } |
| 463 | |
| 464 | if (!user_mode(regs)) |
| 465 | goto kernel_trap; |
| 466 | |
| 467 | trap_signal: { |
| 468 | /* |
| 469 | * We want error_code and trap_no set for userspace faults and |
| 470 | * kernelspace faults which result in die(), but not |
| 471 | * kernelspace faults which are fixed up. die() gives the |
| 472 | * process no chance to handle the signal and notice the |
| 473 | * kernel fault information, so that won't result in polluting |
| 474 | * the information about previously queued, but not yet |
| 475 | * delivered, faults. See also do_general_protection below. |
| 476 | */ |
| 477 | tsk->thread.error_code = error_code; |
| 478 | tsk->thread.trap_no = trapnr; |
| 479 | |
| 480 | if (info) |
| 481 | force_sig_info(signr, info, tsk); |
| 482 | else |
| 483 | force_sig(signr, tsk); |
| 484 | return; |
| 485 | } |
| 486 | |
| 487 | kernel_trap: { |
| 488 | if (!fixup_exception(regs)) { |
| 489 | tsk->thread.error_code = error_code; |
| 490 | tsk->thread.trap_no = trapnr; |
| 491 | die(str, regs, error_code); |
| 492 | } |
| 493 | return; |
| 494 | } |
| 495 | |
| 496 | vm86_trap: { |
| 497 | int ret = handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, trapnr); |
| 498 | if (ret) goto trap_signal; |
| 499 | return; |
| 500 | } |
| 501 | } |
| 502 | |
| 503 | #define DO_ERROR(trapnr, signr, str, name) \ |
| 504 | void do_##name(struct pt_regs * regs, long error_code) \ |
| 505 | { \ |
| 506 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 507 | == NOTIFY_STOP) \ |
| 508 | return; \ |
| 509 | do_trap(trapnr, signr, str, 0, regs, error_code, NULL); \ |
| 510 | } |
| 511 | |
| 512 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr, irq) \ |
| 513 | void do_##name(struct pt_regs * regs, long error_code) \ |
| 514 | { \ |
| 515 | siginfo_t info; \ |
| 516 | if (irq) \ |
| 517 | local_irq_enable(); \ |
| 518 | info.si_signo = signr; \ |
| 519 | info.si_errno = 0; \ |
| 520 | info.si_code = sicode; \ |
| 521 | info.si_addr = (void __user *)siaddr; \ |
| 522 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 523 | == NOTIFY_STOP) \ |
| 524 | return; \ |
| 525 | do_trap(trapnr, signr, str, 0, regs, error_code, &info); \ |
| 526 | } |
| 527 | |
| 528 | #define DO_VM86_ERROR(trapnr, signr, str, name) \ |
| 529 | void do_##name(struct pt_regs * regs, long error_code) \ |
| 530 | { \ |
| 531 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 532 | == NOTIFY_STOP) \ |
| 533 | return; \ |
| 534 | do_trap(trapnr, signr, str, 1, regs, error_code, NULL); \ |
| 535 | } |
| 536 | |
| 537 | #define DO_VM86_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
| 538 | void do_##name(struct pt_regs * regs, long error_code) \ |
| 539 | { \ |
| 540 | siginfo_t info; \ |
| 541 | info.si_signo = signr; \ |
| 542 | info.si_errno = 0; \ |
| 543 | info.si_code = sicode; \ |
| 544 | info.si_addr = (void __user *)siaddr; \ |
| 545 | trace_hardirqs_fixup(); \ |
| 546 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 547 | == NOTIFY_STOP) \ |
| 548 | return; \ |
| 549 | do_trap(trapnr, signr, str, 1, regs, error_code, &info); \ |
| 550 | } |
| 551 | |
| 552 | DO_VM86_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
| 553 | #ifndef CONFIG_KPROBES |
| 554 | DO_VM86_ERROR( 3, SIGTRAP, "int3", int3) |
| 555 | #endif |
| 556 | DO_VM86_ERROR( 4, SIGSEGV, "overflow", overflow) |
| 557 | DO_VM86_ERROR( 5, SIGSEGV, "bounds", bounds) |
| 558 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip, 0) |
| 559 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
| 560 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
| 561 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
| 562 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) |
| 563 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0) |
| 564 | DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0, 1) |
| 565 | |
| 566 | void __kprobes do_general_protection(struct pt_regs * regs, |
| 567 | long error_code) |
| 568 | { |
| 569 | int cpu = get_cpu(); |
| 570 | struct tss_struct *tss = &per_cpu(init_tss, cpu); |
| 571 | struct thread_struct *thread = ¤t->thread; |
| 572 | |
| 573 | /* |
| 574 | * Perform the lazy TSS's I/O bitmap copy. If the TSS has an |
| 575 | * invalid offset set (the LAZY one) and the faulting thread has |
| 576 | * a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS |
| 577 | * and we set the offset field correctly. Then we let the CPU to |
| 578 | * restart the faulting instruction. |
| 579 | */ |
| 580 | if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY && |
| 581 | thread->io_bitmap_ptr) { |
| 582 | memcpy(tss->io_bitmap, thread->io_bitmap_ptr, |
| 583 | thread->io_bitmap_max); |
| 584 | /* |
| 585 | * If the previously set map was extending to higher ports |
| 586 | * than the current one, pad extra space with 0xff (no access). |
| 587 | */ |
| 588 | if (thread->io_bitmap_max < tss->io_bitmap_max) |
| 589 | memset((char *) tss->io_bitmap + |
| 590 | thread->io_bitmap_max, 0xff, |
| 591 | tss->io_bitmap_max - thread->io_bitmap_max); |
| 592 | tss->io_bitmap_max = thread->io_bitmap_max; |
| 593 | tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET; |
| 594 | tss->io_bitmap_owner = thread; |
| 595 | put_cpu(); |
| 596 | return; |
| 597 | } |
| 598 | put_cpu(); |
| 599 | |
| 600 | if (regs->flags & VM_MASK) |
| 601 | goto gp_in_vm86; |
| 602 | |
| 603 | if (!user_mode(regs)) |
| 604 | goto gp_in_kernel; |
| 605 | |
| 606 | current->thread.error_code = error_code; |
| 607 | current->thread.trap_no = 13; |
| 608 | if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) && |
| 609 | printk_ratelimit()) |
| 610 | printk(KERN_INFO |
| 611 | "%s[%d] general protection ip:%lx sp:%lx error:%lx\n", |
| 612 | current->comm, task_pid_nr(current), |
| 613 | regs->ip, regs->sp, error_code); |
| 614 | |
| 615 | force_sig(SIGSEGV, current); |
| 616 | return; |
| 617 | |
| 618 | gp_in_vm86: |
| 619 | local_irq_enable(); |
| 620 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); |
| 621 | return; |
| 622 | |
| 623 | gp_in_kernel: |
| 624 | if (!fixup_exception(regs)) { |
| 625 | current->thread.error_code = error_code; |
| 626 | current->thread.trap_no = 13; |
| 627 | if (notify_die(DIE_GPF, "general protection fault", regs, |
| 628 | error_code, 13, SIGSEGV) == NOTIFY_STOP) |
| 629 | return; |
| 630 | die("general protection fault", regs, error_code); |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | static __kprobes void |
| 635 | mem_parity_error(unsigned char reason, struct pt_regs * regs) |
| 636 | { |
| 637 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x on " |
| 638 | "CPU %d.\n", reason, smp_processor_id()); |
| 639 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
| 640 | |
| 641 | #if defined(CONFIG_EDAC) |
| 642 | if(edac_handler_set()) { |
| 643 | edac_atomic_assert_error(); |
| 644 | return; |
| 645 | } |
| 646 | #endif |
| 647 | |
| 648 | if (panic_on_unrecovered_nmi) |
| 649 | panic("NMI: Not continuing"); |
| 650 | |
| 651 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
| 652 | |
| 653 | /* Clear and disable the memory parity error line. */ |
| 654 | clear_mem_error(reason); |
| 655 | } |
| 656 | |
| 657 | static __kprobes void |
| 658 | io_check_error(unsigned char reason, struct pt_regs * regs) |
| 659 | { |
| 660 | unsigned long i; |
| 661 | |
| 662 | printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n"); |
| 663 | show_registers(regs); |
| 664 | |
| 665 | /* Re-enable the IOCK line, wait for a few seconds */ |
| 666 | reason = (reason & 0xf) | 8; |
| 667 | outb(reason, 0x61); |
| 668 | i = 2000; |
| 669 | while (--i) udelay(1000); |
| 670 | reason &= ~8; |
| 671 | outb(reason, 0x61); |
| 672 | } |
| 673 | |
| 674 | static __kprobes void |
| 675 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) |
| 676 | { |
| 677 | #ifdef CONFIG_MCA |
| 678 | /* Might actually be able to figure out what the guilty party |
| 679 | * is. */ |
| 680 | if( MCA_bus ) { |
| 681 | mca_handle_nmi(); |
| 682 | return; |
| 683 | } |
| 684 | #endif |
| 685 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x on " |
| 686 | "CPU %d.\n", reason, smp_processor_id()); |
| 687 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); |
| 688 | if (panic_on_unrecovered_nmi) |
| 689 | panic("NMI: Not continuing"); |
| 690 | |
| 691 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
| 692 | } |
| 693 | |
| 694 | static DEFINE_SPINLOCK(nmi_print_lock); |
| 695 | |
| 696 | void __kprobes die_nmi(struct pt_regs *regs, const char *msg) |
| 697 | { |
| 698 | if (notify_die(DIE_NMIWATCHDOG, msg, regs, 0, 2, SIGINT) == |
| 699 | NOTIFY_STOP) |
| 700 | return; |
| 701 | |
| 702 | spin_lock(&nmi_print_lock); |
| 703 | /* |
| 704 | * We are in trouble anyway, lets at least try |
| 705 | * to get a message out. |
| 706 | */ |
| 707 | bust_spinlocks(1); |
| 708 | printk(KERN_EMERG "%s", msg); |
| 709 | printk(" on CPU%d, ip %08lx, registers:\n", |
| 710 | smp_processor_id(), regs->ip); |
| 711 | show_registers(regs); |
| 712 | console_silent(); |
| 713 | spin_unlock(&nmi_print_lock); |
| 714 | bust_spinlocks(0); |
| 715 | |
| 716 | /* If we are in kernel we are probably nested up pretty bad |
| 717 | * and might aswell get out now while we still can. |
| 718 | */ |
| 719 | if (!user_mode_vm(regs)) { |
| 720 | current->thread.trap_no = 2; |
| 721 | crash_kexec(regs); |
| 722 | } |
| 723 | |
| 724 | do_exit(SIGSEGV); |
| 725 | } |
| 726 | |
| 727 | static __kprobes void default_do_nmi(struct pt_regs * regs) |
| 728 | { |
| 729 | unsigned char reason = 0; |
| 730 | |
| 731 | /* Only the BSP gets external NMIs from the system. */ |
| 732 | if (!smp_processor_id()) |
| 733 | reason = get_nmi_reason(); |
| 734 | |
| 735 | if (!(reason & 0xc0)) { |
| 736 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
| 737 | == NOTIFY_STOP) |
| 738 | return; |
| 739 | #ifdef CONFIG_X86_LOCAL_APIC |
| 740 | /* |
| 741 | * Ok, so this is none of the documented NMI sources, |
| 742 | * so it must be the NMI watchdog. |
| 743 | */ |
| 744 | if (nmi_watchdog_tick(regs, reason)) |
| 745 | return; |
| 746 | if (!do_nmi_callback(regs, smp_processor_id())) |
| 747 | #endif |
| 748 | unknown_nmi_error(reason, regs); |
| 749 | |
| 750 | return; |
| 751 | } |
| 752 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
| 753 | return; |
| 754 | if (reason & 0x80) |
| 755 | mem_parity_error(reason, regs); |
| 756 | if (reason & 0x40) |
| 757 | io_check_error(reason, regs); |
| 758 | /* |
| 759 | * Reassert NMI in case it became active meanwhile |
| 760 | * as it's edge-triggered. |
| 761 | */ |
| 762 | reassert_nmi(); |
| 763 | } |
| 764 | |
| 765 | static int ignore_nmis; |
| 766 | |
| 767 | __kprobes void do_nmi(struct pt_regs * regs, long error_code) |
| 768 | { |
| 769 | int cpu; |
| 770 | |
| 771 | nmi_enter(); |
| 772 | |
| 773 | cpu = smp_processor_id(); |
| 774 | |
| 775 | ++nmi_count(cpu); |
| 776 | |
| 777 | if (!ignore_nmis) |
| 778 | default_do_nmi(regs); |
| 779 | |
| 780 | nmi_exit(); |
| 781 | } |
| 782 | |
| 783 | void stop_nmi(void) |
| 784 | { |
| 785 | acpi_nmi_disable(); |
| 786 | ignore_nmis++; |
| 787 | } |
| 788 | |
| 789 | void restart_nmi(void) |
| 790 | { |
| 791 | ignore_nmis--; |
| 792 | acpi_nmi_enable(); |
| 793 | } |
| 794 | |
| 795 | #ifdef CONFIG_KPROBES |
| 796 | void __kprobes do_int3(struct pt_regs *regs, long error_code) |
| 797 | { |
| 798 | trace_hardirqs_fixup(); |
| 799 | |
| 800 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) |
| 801 | == NOTIFY_STOP) |
| 802 | return; |
| 803 | /* This is an interrupt gate, because kprobes wants interrupts |
| 804 | disabled. Normal trap handlers don't. */ |
| 805 | restore_interrupts(regs); |
| 806 | do_trap(3, SIGTRAP, "int3", 1, regs, error_code, NULL); |
| 807 | } |
| 808 | #endif |
| 809 | |
| 810 | /* |
| 811 | * Our handling of the processor debug registers is non-trivial. |
| 812 | * We do not clear them on entry and exit from the kernel. Therefore |
| 813 | * it is possible to get a watchpoint trap here from inside the kernel. |
| 814 | * However, the code in ./ptrace.c has ensured that the user can |
| 815 | * only set watchpoints on userspace addresses. Therefore the in-kernel |
| 816 | * watchpoint trap can only occur in code which is reading/writing |
| 817 | * from user space. Such code must not hold kernel locks (since it |
| 818 | * can equally take a page fault), therefore it is safe to call |
| 819 | * force_sig_info even though that claims and releases locks. |
| 820 | * |
| 821 | * Code in ./signal.c ensures that the debug control register |
| 822 | * is restored before we deliver any signal, and therefore that |
| 823 | * user code runs with the correct debug control register even though |
| 824 | * we clear it here. |
| 825 | * |
| 826 | * Being careful here means that we don't have to be as careful in a |
| 827 | * lot of more complicated places (task switching can be a bit lazy |
| 828 | * about restoring all the debug state, and ptrace doesn't have to |
| 829 | * find every occurrence of the TF bit that could be saved away even |
| 830 | * by user code) |
| 831 | */ |
| 832 | void __kprobes do_debug(struct pt_regs * regs, long error_code) |
| 833 | { |
| 834 | unsigned int condition; |
| 835 | struct task_struct *tsk = current; |
| 836 | |
| 837 | trace_hardirqs_fixup(); |
| 838 | |
| 839 | get_debugreg(condition, 6); |
| 840 | |
| 841 | /* |
| 842 | * The processor cleared BTF, so don't mark that we need it set. |
| 843 | */ |
| 844 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); |
| 845 | tsk->thread.debugctlmsr = 0; |
| 846 | |
| 847 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
| 848 | SIGTRAP) == NOTIFY_STOP) |
| 849 | return; |
| 850 | /* It's safe to allow irq's after DR6 has been saved */ |
| 851 | if (regs->flags & X86_EFLAGS_IF) |
| 852 | local_irq_enable(); |
| 853 | |
| 854 | /* Mask out spurious debug traps due to lazy DR7 setting */ |
| 855 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { |
| 856 | if (!tsk->thread.debugreg7) |
| 857 | goto clear_dr7; |
| 858 | } |
| 859 | |
| 860 | if (regs->flags & VM_MASK) |
| 861 | goto debug_vm86; |
| 862 | |
| 863 | /* Save debug status register where ptrace can see it */ |
| 864 | tsk->thread.debugreg6 = condition; |
| 865 | |
| 866 | /* |
| 867 | * Single-stepping through TF: make sure we ignore any events in |
| 868 | * kernel space (but re-enable TF when returning to user mode). |
| 869 | */ |
| 870 | if (condition & DR_STEP) { |
| 871 | /* |
| 872 | * We already checked v86 mode above, so we can |
| 873 | * check for kernel mode by just checking the CPL |
| 874 | * of CS. |
| 875 | */ |
| 876 | if (!user_mode(regs)) |
| 877 | goto clear_TF_reenable; |
| 878 | } |
| 879 | |
| 880 | /* Ok, finally something we can handle */ |
| 881 | send_sigtrap(tsk, regs, error_code); |
| 882 | |
| 883 | /* Disable additional traps. They'll be re-enabled when |
| 884 | * the signal is delivered. |
| 885 | */ |
| 886 | clear_dr7: |
| 887 | set_debugreg(0, 7); |
| 888 | return; |
| 889 | |
| 890 | debug_vm86: |
| 891 | handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1); |
| 892 | return; |
| 893 | |
| 894 | clear_TF_reenable: |
| 895 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
| 896 | regs->flags &= ~TF_MASK; |
| 897 | return; |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Note that we play around with the 'TS' bit in an attempt to get |
| 902 | * the correct behaviour even in the presence of the asynchronous |
| 903 | * IRQ13 behaviour |
| 904 | */ |
| 905 | void math_error(void __user *ip) |
| 906 | { |
| 907 | struct task_struct * task; |
| 908 | siginfo_t info; |
| 909 | unsigned short cwd, swd; |
| 910 | |
| 911 | /* |
| 912 | * Save the info for the exception handler and clear the error. |
| 913 | */ |
| 914 | task = current; |
| 915 | save_init_fpu(task); |
| 916 | task->thread.trap_no = 16; |
| 917 | task->thread.error_code = 0; |
| 918 | info.si_signo = SIGFPE; |
| 919 | info.si_errno = 0; |
| 920 | info.si_code = __SI_FAULT; |
| 921 | info.si_addr = ip; |
| 922 | /* |
| 923 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 924 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 925 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 926 | * fault bit. We should only be taking one exception at a time, |
| 927 | * so if this combination doesn't produce any single exception, |
| 928 | * then we have a bad program that isn't syncronizing its FPU usage |
| 929 | * and it will suffer the consequences since we won't be able to |
| 930 | * fully reproduce the context of the exception |
| 931 | */ |
| 932 | cwd = get_fpu_cwd(task); |
| 933 | swd = get_fpu_swd(task); |
| 934 | switch (swd & ~cwd & 0x3f) { |
| 935 | case 0x000: /* No unmasked exception */ |
| 936 | return; |
| 937 | default: /* Multiple exceptions */ |
| 938 | break; |
| 939 | case 0x001: /* Invalid Op */ |
| 940 | /* |
| 941 | * swd & 0x240 == 0x040: Stack Underflow |
| 942 | * swd & 0x240 == 0x240: Stack Overflow |
| 943 | * User must clear the SF bit (0x40) if set |
| 944 | */ |
| 945 | info.si_code = FPE_FLTINV; |
| 946 | break; |
| 947 | case 0x002: /* Denormalize */ |
| 948 | case 0x010: /* Underflow */ |
| 949 | info.si_code = FPE_FLTUND; |
| 950 | break; |
| 951 | case 0x004: /* Zero Divide */ |
| 952 | info.si_code = FPE_FLTDIV; |
| 953 | break; |
| 954 | case 0x008: /* Overflow */ |
| 955 | info.si_code = FPE_FLTOVF; |
| 956 | break; |
| 957 | case 0x020: /* Precision */ |
| 958 | info.si_code = FPE_FLTRES; |
| 959 | break; |
| 960 | } |
| 961 | force_sig_info(SIGFPE, &info, task); |
| 962 | } |
| 963 | |
| 964 | void do_coprocessor_error(struct pt_regs * regs, long error_code) |
| 965 | { |
| 966 | ignore_fpu_irq = 1; |
| 967 | math_error((void __user *)regs->ip); |
| 968 | } |
| 969 | |
| 970 | static void simd_math_error(void __user *ip) |
| 971 | { |
| 972 | struct task_struct * task; |
| 973 | siginfo_t info; |
| 974 | unsigned short mxcsr; |
| 975 | |
| 976 | /* |
| 977 | * Save the info for the exception handler and clear the error. |
| 978 | */ |
| 979 | task = current; |
| 980 | save_init_fpu(task); |
| 981 | task->thread.trap_no = 19; |
| 982 | task->thread.error_code = 0; |
| 983 | info.si_signo = SIGFPE; |
| 984 | info.si_errno = 0; |
| 985 | info.si_code = __SI_FAULT; |
| 986 | info.si_addr = ip; |
| 987 | /* |
| 988 | * The SIMD FPU exceptions are handled a little differently, as there |
| 989 | * is only a single status/control register. Thus, to determine which |
| 990 | * unmasked exception was caught we must mask the exception mask bits |
| 991 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 992 | */ |
| 993 | mxcsr = get_fpu_mxcsr(task); |
| 994 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { |
| 995 | case 0x000: |
| 996 | default: |
| 997 | break; |
| 998 | case 0x001: /* Invalid Op */ |
| 999 | info.si_code = FPE_FLTINV; |
| 1000 | break; |
| 1001 | case 0x002: /* Denormalize */ |
| 1002 | case 0x010: /* Underflow */ |
| 1003 | info.si_code = FPE_FLTUND; |
| 1004 | break; |
| 1005 | case 0x004: /* Zero Divide */ |
| 1006 | info.si_code = FPE_FLTDIV; |
| 1007 | break; |
| 1008 | case 0x008: /* Overflow */ |
| 1009 | info.si_code = FPE_FLTOVF; |
| 1010 | break; |
| 1011 | case 0x020: /* Precision */ |
| 1012 | info.si_code = FPE_FLTRES; |
| 1013 | break; |
| 1014 | } |
| 1015 | force_sig_info(SIGFPE, &info, task); |
| 1016 | } |
| 1017 | |
| 1018 | void do_simd_coprocessor_error(struct pt_regs * regs, |
| 1019 | long error_code) |
| 1020 | { |
| 1021 | if (cpu_has_xmm) { |
| 1022 | /* Handle SIMD FPU exceptions on PIII+ processors. */ |
| 1023 | ignore_fpu_irq = 1; |
| 1024 | simd_math_error((void __user *)regs->ip); |
| 1025 | } else { |
| 1026 | /* |
| 1027 | * Handle strange cache flush from user space exception |
| 1028 | * in all other cases. This is undocumented behaviour. |
| 1029 | */ |
| 1030 | if (regs->flags & VM_MASK) { |
| 1031 | handle_vm86_fault((struct kernel_vm86_regs *)regs, |
| 1032 | error_code); |
| 1033 | return; |
| 1034 | } |
| 1035 | current->thread.trap_no = 19; |
| 1036 | current->thread.error_code = error_code; |
| 1037 | die_if_kernel("cache flush denied", regs, error_code); |
| 1038 | force_sig(SIGSEGV, current); |
| 1039 | } |
| 1040 | } |
| 1041 | |
| 1042 | void do_spurious_interrupt_bug(struct pt_regs * regs, |
| 1043 | long error_code) |
| 1044 | { |
| 1045 | #if 0 |
| 1046 | /* No need to warn about this any longer. */ |
| 1047 | printk("Ignoring P6 Local APIC Spurious Interrupt Bug...\n"); |
| 1048 | #endif |
| 1049 | } |
| 1050 | |
| 1051 | unsigned long patch_espfix_desc(unsigned long uesp, |
| 1052 | unsigned long kesp) |
| 1053 | { |
| 1054 | struct desc_struct *gdt = __get_cpu_var(gdt_page).gdt; |
| 1055 | unsigned long base = (kesp - uesp) & -THREAD_SIZE; |
| 1056 | unsigned long new_kesp = kesp - base; |
| 1057 | unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT; |
| 1058 | __u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS]; |
| 1059 | /* Set up base for espfix segment */ |
| 1060 | desc &= 0x00f0ff0000000000ULL; |
| 1061 | desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) | |
| 1062 | ((((__u64)base) << 32) & 0xff00000000000000ULL) | |
| 1063 | ((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) | |
| 1064 | (lim_pages & 0xffff); |
| 1065 | *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc; |
| 1066 | return new_kesp; |
| 1067 | } |
| 1068 | |
| 1069 | /* |
| 1070 | * 'math_state_restore()' saves the current math information in the |
| 1071 | * old math state array, and gets the new ones from the current task |
| 1072 | * |
| 1073 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 1074 | * Don't touch unless you *really* know how it works. |
| 1075 | * |
| 1076 | * Must be called with kernel preemption disabled (in this case, |
| 1077 | * local interrupts are disabled at the call-site in entry.S). |
| 1078 | */ |
| 1079 | asmlinkage void math_state_restore(void) |
| 1080 | { |
| 1081 | struct thread_info *thread = current_thread_info(); |
| 1082 | struct task_struct *tsk = thread->task; |
| 1083 | |
| 1084 | clts(); /* Allow maths ops (or we recurse) */ |
| 1085 | if (!tsk_used_math(tsk)) |
| 1086 | init_fpu(tsk); |
| 1087 | restore_fpu(tsk); |
| 1088 | thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ |
| 1089 | tsk->fpu_counter++; |
| 1090 | } |
| 1091 | EXPORT_SYMBOL_GPL(math_state_restore); |
| 1092 | |
| 1093 | #ifndef CONFIG_MATH_EMULATION |
| 1094 | |
| 1095 | asmlinkage void math_emulate(long arg) |
| 1096 | { |
| 1097 | printk(KERN_EMERG "math-emulation not enabled and no coprocessor found.\n"); |
| 1098 | printk(KERN_EMERG "killing %s.\n",current->comm); |
| 1099 | force_sig(SIGFPE,current); |
| 1100 | schedule(); |
| 1101 | } |
| 1102 | |
| 1103 | #endif /* CONFIG_MATH_EMULATION */ |
| 1104 | |
| 1105 | |
| 1106 | void __init trap_init(void) |
| 1107 | { |
| 1108 | int i; |
| 1109 | |
| 1110 | #ifdef CONFIG_EISA |
| 1111 | void __iomem *p = ioremap(0x0FFFD9, 4); |
| 1112 | if (readl(p) == 'E'+('I'<<8)+('S'<<16)+('A'<<24)) { |
| 1113 | EISA_bus = 1; |
| 1114 | } |
| 1115 | iounmap(p); |
| 1116 | #endif |
| 1117 | |
| 1118 | #ifdef CONFIG_X86_LOCAL_APIC |
| 1119 | init_apic_mappings(); |
| 1120 | #endif |
| 1121 | |
| 1122 | set_trap_gate(0,÷_error); |
| 1123 | set_intr_gate(1,&debug); |
| 1124 | set_intr_gate(2,&nmi); |
| 1125 | set_system_intr_gate(3, &int3); /* int3/4 can be called from all */ |
| 1126 | set_system_gate(4,&overflow); |
| 1127 | set_trap_gate(5,&bounds); |
| 1128 | set_trap_gate(6,&invalid_op); |
| 1129 | set_trap_gate(7,&device_not_available); |
| 1130 | set_task_gate(8,GDT_ENTRY_DOUBLEFAULT_TSS); |
| 1131 | set_trap_gate(9,&coprocessor_segment_overrun); |
| 1132 | set_trap_gate(10,&invalid_TSS); |
| 1133 | set_trap_gate(11,&segment_not_present); |
| 1134 | set_trap_gate(12,&stack_segment); |
| 1135 | set_trap_gate(13,&general_protection); |
| 1136 | set_intr_gate(14,&page_fault); |
| 1137 | set_trap_gate(15,&spurious_interrupt_bug); |
| 1138 | set_trap_gate(16,&coprocessor_error); |
| 1139 | set_trap_gate(17,&alignment_check); |
| 1140 | #ifdef CONFIG_X86_MCE |
| 1141 | set_trap_gate(18,&machine_check); |
| 1142 | #endif |
| 1143 | set_trap_gate(19,&simd_coprocessor_error); |
| 1144 | |
| 1145 | if (cpu_has_fxsr) { |
| 1146 | /* |
| 1147 | * Verify that the FXSAVE/FXRSTOR data will be 16-byte aligned. |
| 1148 | * Generates a compile-time "error: zero width for bit-field" if |
| 1149 | * the alignment is wrong. |
| 1150 | */ |
| 1151 | struct fxsrAlignAssert { |
| 1152 | int _:!(offsetof(struct task_struct, |
| 1153 | thread.i387.fxsave) & 15); |
| 1154 | }; |
| 1155 | |
| 1156 | printk(KERN_INFO "Enabling fast FPU save and restore... "); |
| 1157 | set_in_cr4(X86_CR4_OSFXSR); |
| 1158 | printk("done.\n"); |
| 1159 | } |
| 1160 | if (cpu_has_xmm) { |
| 1161 | printk(KERN_INFO "Enabling unmasked SIMD FPU exception " |
| 1162 | "support... "); |
| 1163 | set_in_cr4(X86_CR4_OSXMMEXCPT); |
| 1164 | printk("done.\n"); |
| 1165 | } |
| 1166 | |
| 1167 | set_system_gate(SYSCALL_VECTOR,&system_call); |
| 1168 | |
| 1169 | /* Reserve all the builtin and the syscall vector. */ |
| 1170 | for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) |
| 1171 | set_bit(i, used_vectors); |
| 1172 | set_bit(SYSCALL_VECTOR, used_vectors); |
| 1173 | |
| 1174 | /* |
| 1175 | * Should be a barrier for any external CPU state. |
| 1176 | */ |
| 1177 | cpu_init(); |
| 1178 | |
| 1179 | trap_init_hook(); |
| 1180 | } |
| 1181 | |
| 1182 | static int __init kstack_setup(char *s) |
| 1183 | { |
| 1184 | kstack_depth_to_print = simple_strtoul(s, NULL, 0); |
| 1185 | return 1; |
| 1186 | } |
| 1187 | __setup("kstack=", kstack_setup); |
| 1188 | |
| 1189 | static int __init code_bytes_setup(char *s) |
| 1190 | { |
| 1191 | code_bytes = simple_strtoul(s, NULL, 0); |
| 1192 | if (code_bytes > 8192) |
| 1193 | code_bytes = 8192; |
| 1194 | |
| 1195 | return 1; |
| 1196 | } |
| 1197 | __setup("code_bytes=", code_bytes_setup); |