| 1 | /* |
| 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
| 4 | * |
| 5 | * Pentium III FXSR, SSE support |
| 6 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * 'Traps.c' handles hardware traps and faults after we have saved some |
| 11 | * state in 'entry.S'. |
| 12 | */ |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/ptrace.h> |
| 18 | #include <linux/timer.h> |
| 19 | #include <linux/mm.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/module.h> |
| 26 | #include <linux/moduleparam.h> |
| 27 | #include <linux/nmi.h> |
| 28 | #include <linux/kprobes.h> |
| 29 | #include <linux/kexec.h> |
| 30 | #include <linux/unwind.h> |
| 31 | #include <linux/uaccess.h> |
| 32 | #include <linux/bug.h> |
| 33 | #include <linux/kdebug.h> |
| 34 | #include <linux/utsname.h> |
| 35 | |
| 36 | #if defined(CONFIG_EDAC) |
| 37 | #include <linux/edac.h> |
| 38 | #endif |
| 39 | |
| 40 | #include <asm/system.h> |
| 41 | #include <asm/io.h> |
| 42 | #include <asm/atomic.h> |
| 43 | #include <asm/debugreg.h> |
| 44 | #include <asm/desc.h> |
| 45 | #include <asm/i387.h> |
| 46 | #include <asm/processor.h> |
| 47 | #include <asm/unwind.h> |
| 48 | #include <asm/smp.h> |
| 49 | #include <asm/pgalloc.h> |
| 50 | #include <asm/pda.h> |
| 51 | #include <asm/proto.h> |
| 52 | #include <asm/nmi.h> |
| 53 | #include <asm/stacktrace.h> |
| 54 | |
| 55 | asmlinkage void divide_error(void); |
| 56 | asmlinkage void debug(void); |
| 57 | asmlinkage void nmi(void); |
| 58 | asmlinkage void int3(void); |
| 59 | asmlinkage void overflow(void); |
| 60 | asmlinkage void bounds(void); |
| 61 | asmlinkage void invalid_op(void); |
| 62 | asmlinkage void device_not_available(void); |
| 63 | asmlinkage void double_fault(void); |
| 64 | asmlinkage void coprocessor_segment_overrun(void); |
| 65 | asmlinkage void invalid_TSS(void); |
| 66 | asmlinkage void segment_not_present(void); |
| 67 | asmlinkage void stack_segment(void); |
| 68 | asmlinkage void general_protection(void); |
| 69 | asmlinkage void page_fault(void); |
| 70 | asmlinkage void coprocessor_error(void); |
| 71 | asmlinkage void simd_coprocessor_error(void); |
| 72 | asmlinkage void reserved(void); |
| 73 | asmlinkage void alignment_check(void); |
| 74 | asmlinkage void machine_check(void); |
| 75 | asmlinkage void spurious_interrupt_bug(void); |
| 76 | |
| 77 | static unsigned int code_bytes = 64; |
| 78 | |
| 79 | static inline void conditional_sti(struct pt_regs *regs) |
| 80 | { |
| 81 | if (regs->flags & X86_EFLAGS_IF) |
| 82 | local_irq_enable(); |
| 83 | } |
| 84 | |
| 85 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
| 86 | { |
| 87 | preempt_disable(); |
| 88 | if (regs->flags & X86_EFLAGS_IF) |
| 89 | local_irq_enable(); |
| 90 | } |
| 91 | |
| 92 | static inline void preempt_conditional_cli(struct pt_regs *regs) |
| 93 | { |
| 94 | if (regs->flags & X86_EFLAGS_IF) |
| 95 | local_irq_disable(); |
| 96 | /* Make sure to not schedule here because we could be running |
| 97 | on an exception stack. */ |
| 98 | preempt_enable_no_resched(); |
| 99 | } |
| 100 | |
| 101 | int kstack_depth_to_print = 12; |
| 102 | |
| 103 | #ifdef CONFIG_KALLSYMS |
| 104 | void printk_address(unsigned long address, int reliable) |
| 105 | { |
| 106 | unsigned long offset = 0, symsize; |
| 107 | const char *symname; |
| 108 | char *modname; |
| 109 | char *delim = ":"; |
| 110 | char namebuf[128]; |
| 111 | char reliab[4] = "";; |
| 112 | |
| 113 | symname = kallsyms_lookup(address, &symsize, &offset, |
| 114 | &modname, namebuf); |
| 115 | if (!symname) { |
| 116 | printk(" [<%016lx>]\n", address); |
| 117 | return; |
| 118 | } |
| 119 | if (!reliable) |
| 120 | strcpy(reliab, "? "); |
| 121 | |
| 122 | if (!modname) |
| 123 | modname = delim = ""; |
| 124 | printk(" [<%016lx>] %s%s%s%s%s+0x%lx/0x%lx\n", |
| 125 | address, reliab, delim, modname, delim, symname, offset, symsize); |
| 126 | } |
| 127 | #else |
| 128 | void printk_address(unsigned long address, int reliable) |
| 129 | { |
| 130 | printk(" [<%016lx>]\n", address); |
| 131 | } |
| 132 | #endif |
| 133 | |
| 134 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
| 135 | unsigned *usedp, char **idp) |
| 136 | { |
| 137 | static char ids[][8] = { |
| 138 | [DEBUG_STACK - 1] = "#DB", |
| 139 | [NMI_STACK - 1] = "NMI", |
| 140 | [DOUBLEFAULT_STACK - 1] = "#DF", |
| 141 | [STACKFAULT_STACK - 1] = "#SS", |
| 142 | [MCE_STACK - 1] = "#MC", |
| 143 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
| 144 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" |
| 145 | #endif |
| 146 | }; |
| 147 | unsigned k; |
| 148 | |
| 149 | /* |
| 150 | * Iterate over all exception stacks, and figure out whether |
| 151 | * 'stack' is in one of them: |
| 152 | */ |
| 153 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
| 154 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
| 155 | /* |
| 156 | * Is 'stack' above this exception frame's end? |
| 157 | * If yes then skip to the next frame. |
| 158 | */ |
| 159 | if (stack >= end) |
| 160 | continue; |
| 161 | /* |
| 162 | * Is 'stack' above this exception frame's start address? |
| 163 | * If yes then we found the right frame. |
| 164 | */ |
| 165 | if (stack >= end - EXCEPTION_STKSZ) { |
| 166 | /* |
| 167 | * Make sure we only iterate through an exception |
| 168 | * stack once. If it comes up for the second time |
| 169 | * then there's something wrong going on - just |
| 170 | * break out and return NULL: |
| 171 | */ |
| 172 | if (*usedp & (1U << k)) |
| 173 | break; |
| 174 | *usedp |= 1U << k; |
| 175 | *idp = ids[k]; |
| 176 | return (unsigned long *)end; |
| 177 | } |
| 178 | /* |
| 179 | * If this is a debug stack, and if it has a larger size than |
| 180 | * the usual exception stacks, then 'stack' might still |
| 181 | * be within the lower portion of the debug stack: |
| 182 | */ |
| 183 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
| 184 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { |
| 185 | unsigned j = N_EXCEPTION_STACKS - 1; |
| 186 | |
| 187 | /* |
| 188 | * Black magic. A large debug stack is composed of |
| 189 | * multiple exception stack entries, which we |
| 190 | * iterate through now. Dont look: |
| 191 | */ |
| 192 | do { |
| 193 | ++j; |
| 194 | end -= EXCEPTION_STKSZ; |
| 195 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); |
| 196 | } while (stack < end - EXCEPTION_STKSZ); |
| 197 | if (*usedp & (1U << j)) |
| 198 | break; |
| 199 | *usedp |= 1U << j; |
| 200 | *idp = ids[j]; |
| 201 | return (unsigned long *)end; |
| 202 | } |
| 203 | #endif |
| 204 | } |
| 205 | return NULL; |
| 206 | } |
| 207 | |
| 208 | #define MSG(txt) ops->warning(data, txt) |
| 209 | |
| 210 | /* |
| 211 | * x86-64 can have up to three kernel stacks: |
| 212 | * process stack |
| 213 | * interrupt stack |
| 214 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
| 215 | */ |
| 216 | |
| 217 | static inline int valid_stack_ptr(struct thread_info *tinfo, |
| 218 | void *p, unsigned int size, void *end) |
| 219 | { |
| 220 | void *t = (void *)tinfo; |
| 221 | if (end) { |
| 222 | if (p < end && p >= (end-THREAD_SIZE)) |
| 223 | return 1; |
| 224 | else |
| 225 | return 0; |
| 226 | } |
| 227 | return p > t && p < t + THREAD_SIZE - size; |
| 228 | } |
| 229 | |
| 230 | /* The form of the top of the frame on the stack */ |
| 231 | struct stack_frame { |
| 232 | struct stack_frame *next_frame; |
| 233 | unsigned long return_address; |
| 234 | }; |
| 235 | |
| 236 | |
| 237 | static inline unsigned long print_context_stack(struct thread_info *tinfo, |
| 238 | unsigned long *stack, unsigned long bp, |
| 239 | const struct stacktrace_ops *ops, void *data, |
| 240 | unsigned long *end) |
| 241 | { |
| 242 | struct stack_frame *frame = (struct stack_frame *)bp; |
| 243 | |
| 244 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { |
| 245 | unsigned long addr; |
| 246 | |
| 247 | addr = *stack; |
| 248 | if (__kernel_text_address(addr)) { |
| 249 | if ((unsigned long) stack == bp + 8) { |
| 250 | ops->address(data, addr, 1); |
| 251 | frame = frame->next_frame; |
| 252 | bp = (unsigned long) frame; |
| 253 | } else { |
| 254 | ops->address(data, addr, bp == 0); |
| 255 | } |
| 256 | } |
| 257 | stack++; |
| 258 | } |
| 259 | return bp; |
| 260 | } |
| 261 | |
| 262 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
| 263 | unsigned long *stack, unsigned long bp, |
| 264 | const struct stacktrace_ops *ops, void *data) |
| 265 | { |
| 266 | const unsigned cpu = get_cpu(); |
| 267 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
| 268 | unsigned used = 0; |
| 269 | struct thread_info *tinfo; |
| 270 | |
| 271 | if (!tsk) |
| 272 | tsk = current; |
| 273 | tinfo = task_thread_info(tsk); |
| 274 | |
| 275 | if (!stack) { |
| 276 | unsigned long dummy; |
| 277 | stack = &dummy; |
| 278 | if (tsk && tsk != current) |
| 279 | stack = (unsigned long *)tsk->thread.sp; |
| 280 | } |
| 281 | |
| 282 | #ifdef CONFIG_FRAME_POINTER |
| 283 | if (!bp) { |
| 284 | if (tsk == current) { |
| 285 | /* Grab bp right from our regs */ |
| 286 | asm("movq %%rbp, %0" : "=r" (bp):); |
| 287 | } else { |
| 288 | /* bp is the last reg pushed by switch_to */ |
| 289 | bp = *(unsigned long *) tsk->thread.sp; |
| 290 | } |
| 291 | } |
| 292 | #endif |
| 293 | |
| 294 | |
| 295 | |
| 296 | /* |
| 297 | * Print function call entries in all stacks, starting at the |
| 298 | * current stack address. If the stacks consist of nested |
| 299 | * exceptions |
| 300 | */ |
| 301 | for (;;) { |
| 302 | char *id; |
| 303 | unsigned long *estack_end; |
| 304 | estack_end = in_exception_stack(cpu, (unsigned long)stack, |
| 305 | &used, &id); |
| 306 | |
| 307 | if (estack_end) { |
| 308 | if (ops->stack(data, id) < 0) |
| 309 | break; |
| 310 | |
| 311 | bp = print_context_stack(tinfo, stack, bp, ops, |
| 312 | data, estack_end); |
| 313 | ops->stack(data, "<EOE>"); |
| 314 | /* |
| 315 | * We link to the next stack via the |
| 316 | * second-to-last pointer (index -2 to end) in the |
| 317 | * exception stack: |
| 318 | */ |
| 319 | stack = (unsigned long *) estack_end[-2]; |
| 320 | continue; |
| 321 | } |
| 322 | if (irqstack_end) { |
| 323 | unsigned long *irqstack; |
| 324 | irqstack = irqstack_end - |
| 325 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); |
| 326 | |
| 327 | if (stack >= irqstack && stack < irqstack_end) { |
| 328 | if (ops->stack(data, "IRQ") < 0) |
| 329 | break; |
| 330 | bp = print_context_stack(tinfo, stack, bp, |
| 331 | ops, data, irqstack_end); |
| 332 | /* |
| 333 | * We link to the next stack (which would be |
| 334 | * the process stack normally) the last |
| 335 | * pointer (index -1 to end) in the IRQ stack: |
| 336 | */ |
| 337 | stack = (unsigned long *) (irqstack_end[-1]); |
| 338 | irqstack_end = NULL; |
| 339 | ops->stack(data, "EOI"); |
| 340 | continue; |
| 341 | } |
| 342 | } |
| 343 | break; |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * This handles the process stack: |
| 348 | */ |
| 349 | bp = print_context_stack(tinfo, stack, bp, ops, data, NULL); |
| 350 | put_cpu(); |
| 351 | } |
| 352 | EXPORT_SYMBOL(dump_trace); |
| 353 | |
| 354 | static void |
| 355 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) |
| 356 | { |
| 357 | print_symbol(msg, symbol); |
| 358 | printk("\n"); |
| 359 | } |
| 360 | |
| 361 | static void print_trace_warning(void *data, char *msg) |
| 362 | { |
| 363 | printk("%s\n", msg); |
| 364 | } |
| 365 | |
| 366 | static int print_trace_stack(void *data, char *name) |
| 367 | { |
| 368 | printk(" <%s> ", name); |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static void print_trace_address(void *data, unsigned long addr, int reliable) |
| 373 | { |
| 374 | touch_nmi_watchdog(); |
| 375 | printk_address(addr, reliable); |
| 376 | } |
| 377 | |
| 378 | static const struct stacktrace_ops print_trace_ops = { |
| 379 | .warning = print_trace_warning, |
| 380 | .warning_symbol = print_trace_warning_symbol, |
| 381 | .stack = print_trace_stack, |
| 382 | .address = print_trace_address, |
| 383 | }; |
| 384 | |
| 385 | void |
| 386 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack, |
| 387 | unsigned long bp) |
| 388 | { |
| 389 | printk("\nCall Trace:\n"); |
| 390 | dump_trace(tsk, regs, stack, bp, &print_trace_ops, NULL); |
| 391 | printk("\n"); |
| 392 | } |
| 393 | |
| 394 | static void |
| 395 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *sp, |
| 396 | unsigned long bp) |
| 397 | { |
| 398 | unsigned long *stack; |
| 399 | int i; |
| 400 | const int cpu = smp_processor_id(); |
| 401 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
| 402 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); |
| 403 | |
| 404 | // debugging aid: "show_stack(NULL, NULL);" prints the |
| 405 | // back trace for this cpu. |
| 406 | |
| 407 | if (sp == NULL) { |
| 408 | if (tsk) |
| 409 | sp = (unsigned long *)tsk->thread.sp; |
| 410 | else |
| 411 | sp = (unsigned long *)&sp; |
| 412 | } |
| 413 | |
| 414 | stack = sp; |
| 415 | for(i=0; i < kstack_depth_to_print; i++) { |
| 416 | if (stack >= irqstack && stack <= irqstack_end) { |
| 417 | if (stack == irqstack_end) { |
| 418 | stack = (unsigned long *) (irqstack_end[-1]); |
| 419 | printk(" <EOI> "); |
| 420 | } |
| 421 | } else { |
| 422 | if (((long) stack & (THREAD_SIZE-1)) == 0) |
| 423 | break; |
| 424 | } |
| 425 | if (i && ((i % 4) == 0)) |
| 426 | printk("\n"); |
| 427 | printk(" %016lx", *stack++); |
| 428 | touch_nmi_watchdog(); |
| 429 | } |
| 430 | show_trace(tsk, regs, sp, bp); |
| 431 | } |
| 432 | |
| 433 | void show_stack(struct task_struct *tsk, unsigned long * sp) |
| 434 | { |
| 435 | _show_stack(tsk, NULL, sp, 0); |
| 436 | } |
| 437 | |
| 438 | /* |
| 439 | * The architecture-independent dump_stack generator |
| 440 | */ |
| 441 | void dump_stack(void) |
| 442 | { |
| 443 | unsigned long dummy; |
| 444 | unsigned long bp = 0; |
| 445 | |
| 446 | #ifdef CONFIG_FRAME_POINTER |
| 447 | if (!bp) |
| 448 | asm("movq %%rbp, %0" : "=r" (bp):); |
| 449 | #endif |
| 450 | |
| 451 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", |
| 452 | current->pid, current->comm, print_tainted(), |
| 453 | init_utsname()->release, |
| 454 | (int)strcspn(init_utsname()->version, " "), |
| 455 | init_utsname()->version); |
| 456 | show_trace(NULL, NULL, &dummy, bp); |
| 457 | } |
| 458 | |
| 459 | EXPORT_SYMBOL(dump_stack); |
| 460 | |
| 461 | void show_registers(struct pt_regs *regs) |
| 462 | { |
| 463 | int i; |
| 464 | unsigned long sp; |
| 465 | const int cpu = smp_processor_id(); |
| 466 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
| 467 | u8 *ip; |
| 468 | unsigned int code_prologue = code_bytes * 43 / 64; |
| 469 | unsigned int code_len = code_bytes; |
| 470 | |
| 471 | sp = regs->sp; |
| 472 | ip = (u8 *) regs->ip - code_prologue; |
| 473 | printk("CPU %d ", cpu); |
| 474 | __show_regs(regs); |
| 475 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", |
| 476 | cur->comm, cur->pid, task_thread_info(cur), cur); |
| 477 | |
| 478 | /* |
| 479 | * When in-kernel, we also print out the stack and code at the |
| 480 | * time of the fault.. |
| 481 | */ |
| 482 | if (!user_mode(regs)) { |
| 483 | unsigned char c; |
| 484 | printk("Stack: "); |
| 485 | _show_stack(NULL, regs, (unsigned long *)sp, regs->bp); |
| 486 | printk("\n"); |
| 487 | |
| 488 | printk(KERN_EMERG "Code: "); |
| 489 | if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) { |
| 490 | /* try starting at RIP */ |
| 491 | ip = (u8 *) regs->ip; |
| 492 | code_len = code_len - code_prologue + 1; |
| 493 | } |
| 494 | for (i = 0; i < code_len; i++, ip++) { |
| 495 | if (ip < (u8 *)PAGE_OFFSET || |
| 496 | probe_kernel_address(ip, c)) { |
| 497 | printk(" Bad RIP value."); |
| 498 | break; |
| 499 | } |
| 500 | if (ip == (u8 *)regs->ip) |
| 501 | printk("<%02x> ", c); |
| 502 | else |
| 503 | printk("%02x ", c); |
| 504 | } |
| 505 | } |
| 506 | printk("\n"); |
| 507 | } |
| 508 | |
| 509 | int is_valid_bugaddr(unsigned long ip) |
| 510 | { |
| 511 | unsigned short ud2; |
| 512 | |
| 513 | if (__copy_from_user(&ud2, (const void __user *) ip, sizeof(ud2))) |
| 514 | return 0; |
| 515 | |
| 516 | return ud2 == 0x0b0f; |
| 517 | } |
| 518 | |
| 519 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; |
| 520 | static int die_owner = -1; |
| 521 | static unsigned int die_nest_count; |
| 522 | |
| 523 | unsigned __kprobes long oops_begin(void) |
| 524 | { |
| 525 | int cpu; |
| 526 | unsigned long flags; |
| 527 | |
| 528 | oops_enter(); |
| 529 | |
| 530 | /* racy, but better than risking deadlock. */ |
| 531 | raw_local_irq_save(flags); |
| 532 | cpu = smp_processor_id(); |
| 533 | if (!__raw_spin_trylock(&die_lock)) { |
| 534 | if (cpu == die_owner) |
| 535 | /* nested oops. should stop eventually */; |
| 536 | else |
| 537 | __raw_spin_lock(&die_lock); |
| 538 | } |
| 539 | die_nest_count++; |
| 540 | die_owner = cpu; |
| 541 | console_verbose(); |
| 542 | bust_spinlocks(1); |
| 543 | return flags; |
| 544 | } |
| 545 | |
| 546 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) |
| 547 | { |
| 548 | die_owner = -1; |
| 549 | bust_spinlocks(0); |
| 550 | die_nest_count--; |
| 551 | if (!die_nest_count) |
| 552 | /* Nest count reaches zero, release the lock. */ |
| 553 | __raw_spin_unlock(&die_lock); |
| 554 | raw_local_irq_restore(flags); |
| 555 | if (!regs) { |
| 556 | oops_exit(); |
| 557 | return; |
| 558 | } |
| 559 | if (panic_on_oops) |
| 560 | panic("Fatal exception"); |
| 561 | oops_exit(); |
| 562 | do_exit(signr); |
| 563 | } |
| 564 | |
| 565 | int __kprobes __die(const char * str, struct pt_regs * regs, long err) |
| 566 | { |
| 567 | static int die_counter; |
| 568 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); |
| 569 | #ifdef CONFIG_PREEMPT |
| 570 | printk("PREEMPT "); |
| 571 | #endif |
| 572 | #ifdef CONFIG_SMP |
| 573 | printk("SMP "); |
| 574 | #endif |
| 575 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 576 | printk("DEBUG_PAGEALLOC"); |
| 577 | #endif |
| 578 | printk("\n"); |
| 579 | if (notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) |
| 580 | return 1; |
| 581 | show_registers(regs); |
| 582 | add_taint(TAINT_DIE); |
| 583 | /* Executive summary in case the oops scrolled away */ |
| 584 | printk(KERN_ALERT "RIP "); |
| 585 | printk_address(regs->ip, 1); |
| 586 | printk(" RSP <%016lx>\n", regs->sp); |
| 587 | if (kexec_should_crash(current)) |
| 588 | crash_kexec(regs); |
| 589 | return 0; |
| 590 | } |
| 591 | |
| 592 | void die(const char * str, struct pt_regs * regs, long err) |
| 593 | { |
| 594 | unsigned long flags = oops_begin(); |
| 595 | |
| 596 | if (!user_mode(regs)) |
| 597 | report_bug(regs->ip, regs); |
| 598 | |
| 599 | if (__die(str, regs, err)) |
| 600 | regs = NULL; |
| 601 | oops_end(flags, regs, SIGSEGV); |
| 602 | } |
| 603 | |
| 604 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
| 605 | { |
| 606 | unsigned long flags = oops_begin(); |
| 607 | |
| 608 | /* |
| 609 | * We are in trouble anyway, lets at least try |
| 610 | * to get a message out. |
| 611 | */ |
| 612 | printk(str, smp_processor_id()); |
| 613 | show_registers(regs); |
| 614 | if (kexec_should_crash(current)) |
| 615 | crash_kexec(regs); |
| 616 | if (do_panic || panic_on_oops) |
| 617 | panic("Non maskable interrupt"); |
| 618 | oops_end(flags, NULL, SIGBUS); |
| 619 | nmi_exit(); |
| 620 | local_irq_enable(); |
| 621 | do_exit(SIGBUS); |
| 622 | } |
| 623 | |
| 624 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
| 625 | struct pt_regs * regs, long error_code, |
| 626 | siginfo_t *info) |
| 627 | { |
| 628 | struct task_struct *tsk = current; |
| 629 | |
| 630 | if (user_mode(regs)) { |
| 631 | /* |
| 632 | * We want error_code and trap_no set for userspace |
| 633 | * faults and kernelspace faults which result in |
| 634 | * die(), but not kernelspace faults which are fixed |
| 635 | * up. die() gives the process no chance to handle |
| 636 | * the signal and notice the kernel fault information, |
| 637 | * so that won't result in polluting the information |
| 638 | * about previously queued, but not yet delivered, |
| 639 | * faults. See also do_general_protection below. |
| 640 | */ |
| 641 | tsk->thread.error_code = error_code; |
| 642 | tsk->thread.trap_no = trapnr; |
| 643 | |
| 644 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
| 645 | printk_ratelimit()) { |
| 646 | printk(KERN_INFO |
| 647 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
| 648 | tsk->comm, tsk->pid, str, |
| 649 | regs->ip, regs->sp, error_code); |
| 650 | print_vma_addr(" in ", regs->ip); |
| 651 | printk("\n"); |
| 652 | } |
| 653 | |
| 654 | if (info) |
| 655 | force_sig_info(signr, info, tsk); |
| 656 | else |
| 657 | force_sig(signr, tsk); |
| 658 | return; |
| 659 | } |
| 660 | |
| 661 | |
| 662 | if (!fixup_exception(regs)) { |
| 663 | tsk->thread.error_code = error_code; |
| 664 | tsk->thread.trap_no = trapnr; |
| 665 | die(str, regs, error_code); |
| 666 | } |
| 667 | return; |
| 668 | } |
| 669 | |
| 670 | #define DO_ERROR(trapnr, signr, str, name) \ |
| 671 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ |
| 672 | { \ |
| 673 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 674 | == NOTIFY_STOP) \ |
| 675 | return; \ |
| 676 | conditional_sti(regs); \ |
| 677 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
| 678 | } |
| 679 | |
| 680 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
| 681 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ |
| 682 | { \ |
| 683 | siginfo_t info; \ |
| 684 | info.si_signo = signr; \ |
| 685 | info.si_errno = 0; \ |
| 686 | info.si_code = sicode; \ |
| 687 | info.si_addr = (void __user *)siaddr; \ |
| 688 | trace_hardirqs_fixup(); \ |
| 689 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 690 | == NOTIFY_STOP) \ |
| 691 | return; \ |
| 692 | conditional_sti(regs); \ |
| 693 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
| 694 | } |
| 695 | |
| 696 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
| 697 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) |
| 698 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) |
| 699 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) |
| 700 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
| 701 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
| 702 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
| 703 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
| 704 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) |
| 705 | DO_ERROR(18, SIGSEGV, "reserved", reserved) |
| 706 | |
| 707 | /* Runs on IST stack */ |
| 708 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) |
| 709 | { |
| 710 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, |
| 711 | 12, SIGBUS) == NOTIFY_STOP) |
| 712 | return; |
| 713 | preempt_conditional_sti(regs); |
| 714 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); |
| 715 | preempt_conditional_cli(regs); |
| 716 | } |
| 717 | |
| 718 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) |
| 719 | { |
| 720 | static const char str[] = "double fault"; |
| 721 | struct task_struct *tsk = current; |
| 722 | |
| 723 | /* Return not checked because double check cannot be ignored */ |
| 724 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); |
| 725 | |
| 726 | tsk->thread.error_code = error_code; |
| 727 | tsk->thread.trap_no = 8; |
| 728 | |
| 729 | /* This is always a kernel trap and never fixable (and thus must |
| 730 | never return). */ |
| 731 | for (;;) |
| 732 | die(str, regs, error_code); |
| 733 | } |
| 734 | |
| 735 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
| 736 | long error_code) |
| 737 | { |
| 738 | struct task_struct *tsk = current; |
| 739 | |
| 740 | conditional_sti(regs); |
| 741 | |
| 742 | if (user_mode(regs)) { |
| 743 | tsk->thread.error_code = error_code; |
| 744 | tsk->thread.trap_no = 13; |
| 745 | |
| 746 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
| 747 | printk_ratelimit()) { |
| 748 | printk(KERN_INFO |
| 749 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
| 750 | tsk->comm, tsk->pid, |
| 751 | regs->ip, regs->sp, error_code); |
| 752 | print_vma_addr(" in ", regs->ip); |
| 753 | printk("\n"); |
| 754 | } |
| 755 | |
| 756 | force_sig(SIGSEGV, tsk); |
| 757 | return; |
| 758 | } |
| 759 | |
| 760 | if (fixup_exception(regs)) |
| 761 | return; |
| 762 | |
| 763 | tsk->thread.error_code = error_code; |
| 764 | tsk->thread.trap_no = 13; |
| 765 | if (notify_die(DIE_GPF, "general protection fault", regs, |
| 766 | error_code, 13, SIGSEGV) == NOTIFY_STOP) |
| 767 | return; |
| 768 | die("general protection fault", regs, error_code); |
| 769 | } |
| 770 | |
| 771 | static __kprobes void |
| 772 | mem_parity_error(unsigned char reason, struct pt_regs * regs) |
| 773 | { |
| 774 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
| 775 | reason); |
| 776 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
| 777 | |
| 778 | #if defined(CONFIG_EDAC) |
| 779 | if(edac_handler_set()) { |
| 780 | edac_atomic_assert_error(); |
| 781 | return; |
| 782 | } |
| 783 | #endif |
| 784 | |
| 785 | if (panic_on_unrecovered_nmi) |
| 786 | panic("NMI: Not continuing"); |
| 787 | |
| 788 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
| 789 | |
| 790 | /* Clear and disable the memory parity error line. */ |
| 791 | reason = (reason & 0xf) | 4; |
| 792 | outb(reason, 0x61); |
| 793 | } |
| 794 | |
| 795 | static __kprobes void |
| 796 | io_check_error(unsigned char reason, struct pt_regs * regs) |
| 797 | { |
| 798 | printk("NMI: IOCK error (debug interrupt?)\n"); |
| 799 | show_registers(regs); |
| 800 | |
| 801 | /* Re-enable the IOCK line, wait for a few seconds */ |
| 802 | reason = (reason & 0xf) | 8; |
| 803 | outb(reason, 0x61); |
| 804 | mdelay(2000); |
| 805 | reason &= ~8; |
| 806 | outb(reason, 0x61); |
| 807 | } |
| 808 | |
| 809 | static __kprobes void |
| 810 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) |
| 811 | { |
| 812 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
| 813 | reason); |
| 814 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); |
| 815 | |
| 816 | if (panic_on_unrecovered_nmi) |
| 817 | panic("NMI: Not continuing"); |
| 818 | |
| 819 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
| 820 | } |
| 821 | |
| 822 | /* Runs on IST stack. This code must keep interrupts off all the time. |
| 823 | Nested NMIs are prevented by the CPU. */ |
| 824 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
| 825 | { |
| 826 | unsigned char reason = 0; |
| 827 | int cpu; |
| 828 | |
| 829 | cpu = smp_processor_id(); |
| 830 | |
| 831 | /* Only the BSP gets external NMIs from the system. */ |
| 832 | if (!cpu) |
| 833 | reason = get_nmi_reason(); |
| 834 | |
| 835 | if (!(reason & 0xc0)) { |
| 836 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
| 837 | == NOTIFY_STOP) |
| 838 | return; |
| 839 | /* |
| 840 | * Ok, so this is none of the documented NMI sources, |
| 841 | * so it must be the NMI watchdog. |
| 842 | */ |
| 843 | if (nmi_watchdog_tick(regs,reason)) |
| 844 | return; |
| 845 | if (!do_nmi_callback(regs,cpu)) |
| 846 | unknown_nmi_error(reason, regs); |
| 847 | |
| 848 | return; |
| 849 | } |
| 850 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
| 851 | return; |
| 852 | |
| 853 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ |
| 854 | |
| 855 | if (reason & 0x80) |
| 856 | mem_parity_error(reason, regs); |
| 857 | if (reason & 0x40) |
| 858 | io_check_error(reason, regs); |
| 859 | } |
| 860 | |
| 861 | /* runs on IST stack. */ |
| 862 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
| 863 | { |
| 864 | trace_hardirqs_fixup(); |
| 865 | |
| 866 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { |
| 867 | return; |
| 868 | } |
| 869 | preempt_conditional_sti(regs); |
| 870 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
| 871 | preempt_conditional_cli(regs); |
| 872 | } |
| 873 | |
| 874 | /* Help handler running on IST stack to switch back to user stack |
| 875 | for scheduling or signal handling. The actual stack switch is done in |
| 876 | entry.S */ |
| 877 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
| 878 | { |
| 879 | struct pt_regs *regs = eregs; |
| 880 | /* Did already sync */ |
| 881 | if (eregs == (struct pt_regs *)eregs->sp) |
| 882 | ; |
| 883 | /* Exception from user space */ |
| 884 | else if (user_mode(eregs)) |
| 885 | regs = task_pt_regs(current); |
| 886 | /* Exception from kernel and interrupts are enabled. Move to |
| 887 | kernel process stack. */ |
| 888 | else if (eregs->flags & X86_EFLAGS_IF) |
| 889 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); |
| 890 | if (eregs != regs) |
| 891 | *regs = *eregs; |
| 892 | return regs; |
| 893 | } |
| 894 | |
| 895 | /* runs on IST stack. */ |
| 896 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
| 897 | unsigned long error_code) |
| 898 | { |
| 899 | unsigned long condition; |
| 900 | struct task_struct *tsk = current; |
| 901 | siginfo_t info; |
| 902 | |
| 903 | trace_hardirqs_fixup(); |
| 904 | |
| 905 | get_debugreg(condition, 6); |
| 906 | |
| 907 | /* |
| 908 | * The processor cleared BTF, so don't mark that we need it set. |
| 909 | */ |
| 910 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); |
| 911 | tsk->thread.debugctlmsr = 0; |
| 912 | |
| 913 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
| 914 | SIGTRAP) == NOTIFY_STOP) |
| 915 | return; |
| 916 | |
| 917 | preempt_conditional_sti(regs); |
| 918 | |
| 919 | /* Mask out spurious debug traps due to lazy DR7 setting */ |
| 920 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { |
| 921 | if (!tsk->thread.debugreg7) { |
| 922 | goto clear_dr7; |
| 923 | } |
| 924 | } |
| 925 | |
| 926 | tsk->thread.debugreg6 = condition; |
| 927 | |
| 928 | |
| 929 | /* |
| 930 | * Single-stepping through TF: make sure we ignore any events in |
| 931 | * kernel space (but re-enable TF when returning to user mode). |
| 932 | */ |
| 933 | if (condition & DR_STEP) { |
| 934 | if (!user_mode(regs)) |
| 935 | goto clear_TF_reenable; |
| 936 | } |
| 937 | |
| 938 | /* Ok, finally something we can handle */ |
| 939 | tsk->thread.trap_no = 1; |
| 940 | tsk->thread.error_code = error_code; |
| 941 | info.si_signo = SIGTRAP; |
| 942 | info.si_errno = 0; |
| 943 | info.si_code = TRAP_BRKPT; |
| 944 | info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL; |
| 945 | force_sig_info(SIGTRAP, &info, tsk); |
| 946 | |
| 947 | clear_dr7: |
| 948 | set_debugreg(0UL, 7); |
| 949 | preempt_conditional_cli(regs); |
| 950 | return; |
| 951 | |
| 952 | clear_TF_reenable: |
| 953 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
| 954 | regs->flags &= ~X86_EFLAGS_TF; |
| 955 | preempt_conditional_cli(regs); |
| 956 | } |
| 957 | |
| 958 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
| 959 | { |
| 960 | if (fixup_exception(regs)) |
| 961 | return 1; |
| 962 | |
| 963 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
| 964 | /* Illegal floating point operation in the kernel */ |
| 965 | current->thread.trap_no = trapnr; |
| 966 | die(str, regs, 0); |
| 967 | return 0; |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * Note that we play around with the 'TS' bit in an attempt to get |
| 972 | * the correct behaviour even in the presence of the asynchronous |
| 973 | * IRQ13 behaviour |
| 974 | */ |
| 975 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) |
| 976 | { |
| 977 | void __user *ip = (void __user *)(regs->ip); |
| 978 | struct task_struct * task; |
| 979 | siginfo_t info; |
| 980 | unsigned short cwd, swd; |
| 981 | |
| 982 | conditional_sti(regs); |
| 983 | if (!user_mode(regs) && |
| 984 | kernel_math_error(regs, "kernel x87 math error", 16)) |
| 985 | return; |
| 986 | |
| 987 | /* |
| 988 | * Save the info for the exception handler and clear the error. |
| 989 | */ |
| 990 | task = current; |
| 991 | save_init_fpu(task); |
| 992 | task->thread.trap_no = 16; |
| 993 | task->thread.error_code = 0; |
| 994 | info.si_signo = SIGFPE; |
| 995 | info.si_errno = 0; |
| 996 | info.si_code = __SI_FAULT; |
| 997 | info.si_addr = ip; |
| 998 | /* |
| 999 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 1000 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 1001 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 1002 | * fault bit. We should only be taking one exception at a time, |
| 1003 | * so if this combination doesn't produce any single exception, |
| 1004 | * then we have a bad program that isn't synchronizing its FPU usage |
| 1005 | * and it will suffer the consequences since we won't be able to |
| 1006 | * fully reproduce the context of the exception |
| 1007 | */ |
| 1008 | cwd = get_fpu_cwd(task); |
| 1009 | swd = get_fpu_swd(task); |
| 1010 | switch (swd & ~cwd & 0x3f) { |
| 1011 | case 0x000: |
| 1012 | default: |
| 1013 | break; |
| 1014 | case 0x001: /* Invalid Op */ |
| 1015 | /* |
| 1016 | * swd & 0x240 == 0x040: Stack Underflow |
| 1017 | * swd & 0x240 == 0x240: Stack Overflow |
| 1018 | * User must clear the SF bit (0x40) if set |
| 1019 | */ |
| 1020 | info.si_code = FPE_FLTINV; |
| 1021 | break; |
| 1022 | case 0x002: /* Denormalize */ |
| 1023 | case 0x010: /* Underflow */ |
| 1024 | info.si_code = FPE_FLTUND; |
| 1025 | break; |
| 1026 | case 0x004: /* Zero Divide */ |
| 1027 | info.si_code = FPE_FLTDIV; |
| 1028 | break; |
| 1029 | case 0x008: /* Overflow */ |
| 1030 | info.si_code = FPE_FLTOVF; |
| 1031 | break; |
| 1032 | case 0x020: /* Precision */ |
| 1033 | info.si_code = FPE_FLTRES; |
| 1034 | break; |
| 1035 | } |
| 1036 | force_sig_info(SIGFPE, &info, task); |
| 1037 | } |
| 1038 | |
| 1039 | asmlinkage void bad_intr(void) |
| 1040 | { |
| 1041 | printk("bad interrupt"); |
| 1042 | } |
| 1043 | |
| 1044 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) |
| 1045 | { |
| 1046 | void __user *ip = (void __user *)(regs->ip); |
| 1047 | struct task_struct * task; |
| 1048 | siginfo_t info; |
| 1049 | unsigned short mxcsr; |
| 1050 | |
| 1051 | conditional_sti(regs); |
| 1052 | if (!user_mode(regs) && |
| 1053 | kernel_math_error(regs, "kernel simd math error", 19)) |
| 1054 | return; |
| 1055 | |
| 1056 | /* |
| 1057 | * Save the info for the exception handler and clear the error. |
| 1058 | */ |
| 1059 | task = current; |
| 1060 | save_init_fpu(task); |
| 1061 | task->thread.trap_no = 19; |
| 1062 | task->thread.error_code = 0; |
| 1063 | info.si_signo = SIGFPE; |
| 1064 | info.si_errno = 0; |
| 1065 | info.si_code = __SI_FAULT; |
| 1066 | info.si_addr = ip; |
| 1067 | /* |
| 1068 | * The SIMD FPU exceptions are handled a little differently, as there |
| 1069 | * is only a single status/control register. Thus, to determine which |
| 1070 | * unmasked exception was caught we must mask the exception mask bits |
| 1071 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 1072 | */ |
| 1073 | mxcsr = get_fpu_mxcsr(task); |
| 1074 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { |
| 1075 | case 0x000: |
| 1076 | default: |
| 1077 | break; |
| 1078 | case 0x001: /* Invalid Op */ |
| 1079 | info.si_code = FPE_FLTINV; |
| 1080 | break; |
| 1081 | case 0x002: /* Denormalize */ |
| 1082 | case 0x010: /* Underflow */ |
| 1083 | info.si_code = FPE_FLTUND; |
| 1084 | break; |
| 1085 | case 0x004: /* Zero Divide */ |
| 1086 | info.si_code = FPE_FLTDIV; |
| 1087 | break; |
| 1088 | case 0x008: /* Overflow */ |
| 1089 | info.si_code = FPE_FLTOVF; |
| 1090 | break; |
| 1091 | case 0x020: /* Precision */ |
| 1092 | info.si_code = FPE_FLTRES; |
| 1093 | break; |
| 1094 | } |
| 1095 | force_sig_info(SIGFPE, &info, task); |
| 1096 | } |
| 1097 | |
| 1098 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) |
| 1099 | { |
| 1100 | } |
| 1101 | |
| 1102 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) |
| 1103 | { |
| 1104 | } |
| 1105 | |
| 1106 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) |
| 1107 | { |
| 1108 | } |
| 1109 | |
| 1110 | /* |
| 1111 | * 'math_state_restore()' saves the current math information in the |
| 1112 | * old math state array, and gets the new ones from the current task |
| 1113 | * |
| 1114 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 1115 | * Don't touch unless you *really* know how it works. |
| 1116 | */ |
| 1117 | asmlinkage void math_state_restore(void) |
| 1118 | { |
| 1119 | struct task_struct *me = current; |
| 1120 | clts(); /* Allow maths ops (or we recurse) */ |
| 1121 | |
| 1122 | if (!used_math()) |
| 1123 | init_fpu(me); |
| 1124 | restore_fpu_checking(&me->thread.i387.fxsave); |
| 1125 | task_thread_info(me)->status |= TS_USEDFPU; |
| 1126 | me->fpu_counter++; |
| 1127 | } |
| 1128 | EXPORT_SYMBOL_GPL(math_state_restore); |
| 1129 | |
| 1130 | void __init trap_init(void) |
| 1131 | { |
| 1132 | set_intr_gate(0,÷_error); |
| 1133 | set_intr_gate_ist(1,&debug,DEBUG_STACK); |
| 1134 | set_intr_gate_ist(2,&nmi,NMI_STACK); |
| 1135 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
| 1136 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
| 1137 | set_intr_gate(5,&bounds); |
| 1138 | set_intr_gate(6,&invalid_op); |
| 1139 | set_intr_gate(7,&device_not_available); |
| 1140 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); |
| 1141 | set_intr_gate(9,&coprocessor_segment_overrun); |
| 1142 | set_intr_gate(10,&invalid_TSS); |
| 1143 | set_intr_gate(11,&segment_not_present); |
| 1144 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); |
| 1145 | set_intr_gate(13,&general_protection); |
| 1146 | set_intr_gate(14,&page_fault); |
| 1147 | set_intr_gate(15,&spurious_interrupt_bug); |
| 1148 | set_intr_gate(16,&coprocessor_error); |
| 1149 | set_intr_gate(17,&alignment_check); |
| 1150 | #ifdef CONFIG_X86_MCE |
| 1151 | set_intr_gate_ist(18,&machine_check, MCE_STACK); |
| 1152 | #endif |
| 1153 | set_intr_gate(19,&simd_coprocessor_error); |
| 1154 | |
| 1155 | #ifdef CONFIG_IA32_EMULATION |
| 1156 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); |
| 1157 | #endif |
| 1158 | |
| 1159 | /* |
| 1160 | * Should be a barrier for any external CPU state. |
| 1161 | */ |
| 1162 | cpu_init(); |
| 1163 | } |
| 1164 | |
| 1165 | |
| 1166 | static int __init oops_setup(char *s) |
| 1167 | { |
| 1168 | if (!s) |
| 1169 | return -EINVAL; |
| 1170 | if (!strcmp(s, "panic")) |
| 1171 | panic_on_oops = 1; |
| 1172 | return 0; |
| 1173 | } |
| 1174 | early_param("oops", oops_setup); |
| 1175 | |
| 1176 | static int __init kstack_setup(char *s) |
| 1177 | { |
| 1178 | if (!s) |
| 1179 | return -EINVAL; |
| 1180 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
| 1181 | return 0; |
| 1182 | } |
| 1183 | early_param("kstack", kstack_setup); |
| 1184 | |
| 1185 | |
| 1186 | static int __init code_bytes_setup(char *s) |
| 1187 | { |
| 1188 | code_bytes = simple_strtoul(s, NULL, 0); |
| 1189 | if (code_bytes > 8192) |
| 1190 | code_bytes = 8192; |
| 1191 | |
| 1192 | return 1; |
| 1193 | } |
| 1194 | __setup("code_bytes=", code_bytes_setup); |