2 * linux/arch/x86-64/traps.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
7 * Pentium III FXSR, SSE support
8 * Gareth Hughes <gareth@valinux.com>, May 2000
12 * 'Traps.c' handles hardware traps and faults after we have saved some
15 #include <linux/config.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/string.h>
19 #include <linux/errno.h>
20 #include <linux/ptrace.h>
21 #include <linux/timer.h>
23 #include <linux/init.h>
24 #include <linux/delay.h>
25 #include <linux/spinlock.h>
26 #include <linux/interrupt.h>
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/nmi.h>
30 #include <linux/kprobes.h>
31 #include <linux/kexec.h>
33 #include <asm/system.h>
34 #include <asm/uaccess.h>
36 #include <asm/atomic.h>
37 #include <asm/debugreg.h>
40 #include <asm/kdebug.h>
41 #include <asm/processor.h>
44 #include <asm/pgalloc.h>
46 #include <asm/proto.h>
49 asmlinkage void divide_error(void);
50 asmlinkage void debug(void);
51 asmlinkage void nmi(void);
52 asmlinkage void int3(void);
53 asmlinkage void overflow(void);
54 asmlinkage void bounds(void);
55 asmlinkage void invalid_op(void);
56 asmlinkage void device_not_available(void);
57 asmlinkage void double_fault(void);
58 asmlinkage void coprocessor_segment_overrun(void);
59 asmlinkage void invalid_TSS(void);
60 asmlinkage void segment_not_present(void);
61 asmlinkage void stack_segment(void);
62 asmlinkage void general_protection(void);
63 asmlinkage void page_fault(void);
64 asmlinkage void coprocessor_error(void);
65 asmlinkage void simd_coprocessor_error(void);
66 asmlinkage void reserved(void);
67 asmlinkage void alignment_check(void);
68 asmlinkage void machine_check(void);
69 asmlinkage void spurious_interrupt_bug(void);
71 ATOMIC_NOTIFIER_HEAD(die_chain);
73 int register_die_notifier(struct notifier_block *nb)
76 return atomic_notifier_chain_register(&die_chain, nb);
78 EXPORT_SYMBOL(register_die_notifier);
80 int unregister_die_notifier(struct notifier_block *nb)
82 return atomic_notifier_chain_unregister(&die_chain, nb);
84 EXPORT_SYMBOL(unregister_die_notifier);
86 static inline void conditional_sti(struct pt_regs *regs)
88 if (regs->eflags & X86_EFLAGS_IF)
92 static inline void preempt_conditional_sti(struct pt_regs *regs)
95 if (regs->eflags & X86_EFLAGS_IF)
99 static inline void preempt_conditional_cli(struct pt_regs *regs)
101 if (regs->eflags & X86_EFLAGS_IF)
103 /* Make sure to not schedule here because we could be running
104 on an exception stack. */
105 preempt_enable_no_resched();
108 static int kstack_depth_to_print = 10;
110 #ifdef CONFIG_KALLSYMS
111 #include <linux/kallsyms.h>
112 int printk_address(unsigned long address)
114 unsigned long offset = 0, symsize;
120 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
122 return printk("[<%016lx>]", address);
124 modname = delim = "";
125 return printk("<%016lx>{%s%s%s%s%+ld}",
126 address, delim, modname, delim, symname, offset);
129 int printk_address(unsigned long address)
131 return printk("[<%016lx>]", address);
135 static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
136 unsigned *usedp, const char **idp)
138 static char ids[][8] = {
139 [DEBUG_STACK - 1] = "#DB",
140 [NMI_STACK - 1] = "NMI",
141 [DOUBLEFAULT_STACK - 1] = "#DF",
142 [STACKFAULT_STACK - 1] = "#SS",
143 [MCE_STACK - 1] = "#MC",
144 #if DEBUG_STKSZ > EXCEPTION_STKSZ
145 [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
150 for (k = 0; k < N_EXCEPTION_STACKS; k++) {
154 #if DEBUG_STKSZ > EXCEPTION_STKSZ
156 end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ;
160 end = per_cpu(init_tss, cpu).ist[k];
165 if (stack >= end - EXCEPTION_STKSZ) {
166 if (*usedp & (1U << k))
170 return (unsigned long *)end;
172 #if DEBUG_STKSZ > EXCEPTION_STKSZ
173 if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
174 unsigned j = N_EXCEPTION_STACKS - 1;
178 end -= EXCEPTION_STKSZ;
179 ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
180 } while (stack < end - EXCEPTION_STKSZ);
181 if (*usedp & (1U << j))
185 return (unsigned long *)end;
193 * x86-64 can have upto three kernel stacks:
196 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
199 void show_trace(unsigned long *stack)
201 const unsigned cpu = safe_smp_processor_id();
202 unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
206 printk("\nCall Trace:");
208 #define HANDLE_STACK(cond) \
210 unsigned long addr = *stack++; \
211 if (kernel_text_address(addr)) { \
219 * If the address is either in the text segment of the \
220 * kernel, or in the region which contains vmalloc'ed \
221 * memory, it *may* be the address of a calling \
222 * routine; if so, print it so that someone tracing \
223 * down the cause of the crash will be able to figure \
224 * out the call path that was taken. \
226 i += printk_address(addr); \
232 unsigned long *estack_end;
233 estack_end = in_exception_stack(cpu, (unsigned long)stack,
237 i += printk(" <%s>", id);
238 HANDLE_STACK (stack < estack_end);
239 i += printk(" <EOE>");
240 stack = (unsigned long *) estack_end[-2];
244 unsigned long *irqstack;
245 irqstack = irqstack_end -
246 (IRQSTACKSIZE - 64) / sizeof(*irqstack);
248 if (stack >= irqstack && stack < irqstack_end) {
249 i += printk(" <IRQ>");
250 HANDLE_STACK (stack < irqstack_end);
251 stack = (unsigned long *) (irqstack_end[-1]);
253 i += printk(" <EOI>");
260 HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
265 void show_stack(struct task_struct *tsk, unsigned long * rsp)
267 unsigned long *stack;
269 const int cpu = safe_smp_processor_id();
270 unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr);
271 unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
273 // debugging aid: "show_stack(NULL, NULL);" prints the
274 // back trace for this cpu.
278 rsp = (unsigned long *)tsk->thread.rsp;
280 rsp = (unsigned long *)&rsp;
284 for(i=0; i < kstack_depth_to_print; i++) {
285 if (stack >= irqstack && stack <= irqstack_end) {
286 if (stack == irqstack_end) {
287 stack = (unsigned long *) (irqstack_end[-1]);
291 if (((long) stack & (THREAD_SIZE-1)) == 0)
294 if (i && ((i % 4) == 0))
296 printk("%016lx ", *stack++);
297 touch_nmi_watchdog();
299 show_trace((unsigned long *)rsp);
303 * The architecture-independent dump_stack generator
305 void dump_stack(void)
311 EXPORT_SYMBOL(dump_stack);
313 void show_registers(struct pt_regs *regs)
316 int in_kernel = !user_mode(regs);
318 const int cpu = safe_smp_processor_id();
319 struct task_struct *cur = cpu_pda(cpu)->pcurrent;
323 printk("CPU %d ", cpu);
325 printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
326 cur->comm, cur->pid, task_thread_info(cur), cur);
329 * When in-kernel, we also print out the stack and code at the
330 * time of the fault..
335 show_stack(NULL, (unsigned long*)rsp);
338 if (regs->rip < PAGE_OFFSET)
341 for (i=0; i<20; i++) {
343 if (__get_user(c, &((unsigned char*)regs->rip)[i])) {
345 printk(" Bad RIP value.");
354 void handle_BUG(struct pt_regs *regs)
358 const char *prefix = "";
362 if (__copy_from_user(&f, (const void __user *) regs->rip,
363 sizeof(struct bug_frame)))
365 if (f.filename >= 0 ||
366 f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
368 len = __strnlen_user((char *)(long)f.filename, PATH_MAX) - 1;
369 if (len < 0 || len >= PATH_MAX)
370 f.filename = (int)(long)"unmapped filename";
372 f.filename += len - 50;
375 printk("----------- [cut here ] --------- [please bite here ] ---------\n");
376 printk(KERN_ALERT "Kernel BUG at %s%.50s:%d\n", prefix, (char *)(long)f.filename, f.line);
380 void out_of_line_bug(void)
386 static DEFINE_SPINLOCK(die_lock);
387 static int die_owner = -1;
388 static unsigned int die_nest_count;
390 unsigned __kprobes long oops_begin(void)
392 int cpu = safe_smp_processor_id();
395 /* racy, but better than risking deadlock. */
396 local_irq_save(flags);
397 if (!spin_trylock(&die_lock)) {
398 if (cpu == die_owner)
399 /* nested oops. should stop eventually */;
401 spin_lock(&die_lock);
410 void __kprobes oops_end(unsigned long flags)
416 /* We still own the lock */
417 local_irq_restore(flags);
419 /* Nest count reaches zero, release the lock. */
420 spin_unlock_irqrestore(&die_lock, flags);
425 void __kprobes __die(const char * str, struct pt_regs * regs, long err)
427 static int die_counter;
428 printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
429 #ifdef CONFIG_PREEMPT
435 #ifdef CONFIG_DEBUG_PAGEALLOC
436 printk("DEBUG_PAGEALLOC");
439 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
440 show_registers(regs);
441 /* Executive summary in case the oops scrolled away */
442 printk(KERN_ALERT "RIP ");
443 printk_address(regs->rip);
444 printk(" RSP <%016lx>\n", regs->rsp);
445 if (kexec_should_crash(current))
449 void die(const char * str, struct pt_regs * regs, long err)
451 unsigned long flags = oops_begin();
454 __die(str, regs, err);
459 void __kprobes die_nmi(char *str, struct pt_regs *regs)
461 unsigned long flags = oops_begin();
464 * We are in trouble anyway, lets at least try
465 * to get a message out.
467 printk(str, safe_smp_processor_id());
468 show_registers(regs);
469 if (kexec_should_crash(current))
471 if (panic_on_timeout || panic_on_oops)
472 panic("nmi watchdog");
473 printk("console shuts up ...\n");
480 static void __kprobes do_trap(int trapnr, int signr, char *str,
481 struct pt_regs * regs, long error_code,
484 struct task_struct *tsk = current;
486 tsk->thread.error_code = error_code;
487 tsk->thread.trap_no = trapnr;
489 if (user_mode(regs)) {
490 if (exception_trace && unhandled_signal(tsk, signr))
492 "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
493 tsk->comm, tsk->pid, str,
494 regs->rip, regs->rsp, error_code);
497 force_sig_info(signr, info, tsk);
499 force_sig(signr, tsk);
506 const struct exception_table_entry *fixup;
507 fixup = search_exception_tables(regs->rip);
509 regs->rip = fixup->fixup;
511 die(str, regs, error_code);
516 #define DO_ERROR(trapnr, signr, str, name) \
517 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
519 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
522 conditional_sti(regs); \
523 do_trap(trapnr, signr, str, regs, error_code, NULL); \
526 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
527 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
530 info.si_signo = signr; \
532 info.si_code = sicode; \
533 info.si_addr = (void __user *)siaddr; \
534 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
537 conditional_sti(regs); \
538 do_trap(trapnr, signr, str, regs, error_code, &info); \
541 DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
542 DO_ERROR( 4, SIGSEGV, "overflow", overflow)
543 DO_ERROR( 5, SIGSEGV, "bounds", bounds)
544 DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip)
545 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
546 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
547 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
548 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
549 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
550 DO_ERROR(18, SIGSEGV, "reserved", reserved)
552 /* Runs on IST stack */
553 asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
555 if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
556 12, SIGBUS) == NOTIFY_STOP)
558 preempt_conditional_sti(regs);
559 do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
560 preempt_conditional_cli(regs);
563 asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
565 static const char str[] = "double fault";
566 struct task_struct *tsk = current;
568 /* Return not checked because double check cannot be ignored */
569 notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
571 tsk->thread.error_code = error_code;
572 tsk->thread.trap_no = 8;
574 /* This is always a kernel trap and never fixable (and thus must
577 die(str, regs, error_code);
580 asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
583 struct task_struct *tsk = current;
585 conditional_sti(regs);
587 tsk->thread.error_code = error_code;
588 tsk->thread.trap_no = 13;
590 if (user_mode(regs)) {
591 if (exception_trace && unhandled_signal(tsk, SIGSEGV))
593 "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
595 regs->rip, regs->rsp, error_code);
597 force_sig(SIGSEGV, tsk);
603 const struct exception_table_entry *fixup;
604 fixup = search_exception_tables(regs->rip);
606 regs->rip = fixup->fixup;
609 if (notify_die(DIE_GPF, "general protection fault", regs,
610 error_code, 13, SIGSEGV) == NOTIFY_STOP)
612 die("general protection fault", regs, error_code);
616 static __kprobes void
617 mem_parity_error(unsigned char reason, struct pt_regs * regs)
619 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
620 printk("You probably have a hardware problem with your RAM chips\n");
622 /* Clear and disable the memory parity error line. */
623 reason = (reason & 0xf) | 4;
627 static __kprobes void
628 io_check_error(unsigned char reason, struct pt_regs * regs)
630 printk("NMI: IOCK error (debug interrupt?)\n");
631 show_registers(regs);
633 /* Re-enable the IOCK line, wait for a few seconds */
634 reason = (reason & 0xf) | 8;
641 static __kprobes void
642 unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
643 { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
644 printk("Dazed and confused, but trying to continue\n");
645 printk("Do you have a strange power saving mode enabled?\n");
648 /* Runs on IST stack. This code must keep interrupts off all the time.
649 Nested NMIs are prevented by the CPU. */
650 asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
652 unsigned char reason = 0;
655 cpu = smp_processor_id();
657 /* Only the BSP gets external NMIs from the system. */
659 reason = get_nmi_reason();
661 if (!(reason & 0xc0)) {
662 if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
665 #ifdef CONFIG_X86_LOCAL_APIC
667 * Ok, so this is none of the documented NMI sources,
668 * so it must be the NMI watchdog.
670 if (nmi_watchdog > 0) {
671 nmi_watchdog_tick(regs,reason);
675 unknown_nmi_error(reason, regs);
678 if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
681 /* AK: following checks seem to be broken on modern chipsets. FIXME */
684 mem_parity_error(reason, regs);
686 io_check_error(reason, regs);
689 /* runs on IST stack. */
690 asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
692 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
695 preempt_conditional_sti(regs);
696 do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
697 preempt_conditional_cli(regs);
700 /* Help handler running on IST stack to switch back to user stack
701 for scheduling or signal handling. The actual stack switch is done in
703 asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
705 struct pt_regs *regs = eregs;
706 /* Did already sync */
707 if (eregs == (struct pt_regs *)eregs->rsp)
709 /* Exception from user space */
710 else if (user_mode(eregs))
711 regs = task_pt_regs(current);
712 /* Exception from kernel and interrupts are enabled. Move to
713 kernel process stack. */
714 else if (eregs->eflags & X86_EFLAGS_IF)
715 regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs));
721 /* runs on IST stack. */
722 asmlinkage void __kprobes do_debug(struct pt_regs * regs,
723 unsigned long error_code)
725 unsigned long condition;
726 struct task_struct *tsk = current;
729 get_debugreg(condition, 6);
731 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
732 SIGTRAP) == NOTIFY_STOP)
735 preempt_conditional_sti(regs);
737 /* Mask out spurious debug traps due to lazy DR7 setting */
738 if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
739 if (!tsk->thread.debugreg7) {
744 tsk->thread.debugreg6 = condition;
746 /* Mask out spurious TF errors due to lazy TF clearing */
747 if (condition & DR_STEP) {
749 * The TF error should be masked out only if the current
750 * process is not traced and if the TRAP flag has been set
751 * previously by a tracing process (condition detected by
752 * the PT_DTRACE flag); remember that the i386 TRAP flag
753 * can be modified by the process itself in user mode,
754 * allowing programs to debug themselves without the ptrace()
757 if (!user_mode(regs))
758 goto clear_TF_reenable;
760 * Was the TF flag set by a debugger? If so, clear it now,
761 * so that register information is correct.
763 if (tsk->ptrace & PT_DTRACE) {
764 regs->eflags &= ~TF_MASK;
765 tsk->ptrace &= ~PT_DTRACE;
769 /* Ok, finally something we can handle */
770 tsk->thread.trap_no = 1;
771 tsk->thread.error_code = error_code;
772 info.si_signo = SIGTRAP;
774 info.si_code = TRAP_BRKPT;
775 info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL;
776 force_sig_info(SIGTRAP, &info, tsk);
779 set_debugreg(0UL, 7);
780 preempt_conditional_cli(regs);
784 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
785 regs->eflags &= ~TF_MASK;
786 preempt_conditional_cli(regs);
789 static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
791 const struct exception_table_entry *fixup;
792 fixup = search_exception_tables(regs->rip);
794 regs->rip = fixup->fixup;
797 notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
798 /* Illegal floating point operation in the kernel */
799 current->thread.trap_no = trapnr;
805 * Note that we play around with the 'TS' bit in an attempt to get
806 * the correct behaviour even in the presence of the asynchronous
809 asmlinkage void do_coprocessor_error(struct pt_regs *regs)
811 void __user *rip = (void __user *)(regs->rip);
812 struct task_struct * task;
814 unsigned short cwd, swd;
816 conditional_sti(regs);
817 if (!user_mode(regs) &&
818 kernel_math_error(regs, "kernel x87 math error", 16))
822 * Save the info for the exception handler and clear the error.
826 task->thread.trap_no = 16;
827 task->thread.error_code = 0;
828 info.si_signo = SIGFPE;
830 info.si_code = __SI_FAULT;
833 * (~cwd & swd) will mask out exceptions that are not set to unmasked
834 * status. 0x3f is the exception bits in these regs, 0x200 is the
835 * C1 reg you need in case of a stack fault, 0x040 is the stack
836 * fault bit. We should only be taking one exception at a time,
837 * so if this combination doesn't produce any single exception,
838 * then we have a bad program that isn't synchronizing its FPU usage
839 * and it will suffer the consequences since we won't be able to
840 * fully reproduce the context of the exception
842 cwd = get_fpu_cwd(task);
843 swd = get_fpu_swd(task);
844 switch (swd & ~cwd & 0x3f) {
848 case 0x001: /* Invalid Op */
850 * swd & 0x240 == 0x040: Stack Underflow
851 * swd & 0x240 == 0x240: Stack Overflow
852 * User must clear the SF bit (0x40) if set
854 info.si_code = FPE_FLTINV;
856 case 0x002: /* Denormalize */
857 case 0x010: /* Underflow */
858 info.si_code = FPE_FLTUND;
860 case 0x004: /* Zero Divide */
861 info.si_code = FPE_FLTDIV;
863 case 0x008: /* Overflow */
864 info.si_code = FPE_FLTOVF;
866 case 0x020: /* Precision */
867 info.si_code = FPE_FLTRES;
870 force_sig_info(SIGFPE, &info, task);
873 asmlinkage void bad_intr(void)
875 printk("bad interrupt");
878 asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
880 void __user *rip = (void __user *)(regs->rip);
881 struct task_struct * task;
883 unsigned short mxcsr;
885 conditional_sti(regs);
886 if (!user_mode(regs) &&
887 kernel_math_error(regs, "kernel simd math error", 19))
891 * Save the info for the exception handler and clear the error.
895 task->thread.trap_no = 19;
896 task->thread.error_code = 0;
897 info.si_signo = SIGFPE;
899 info.si_code = __SI_FAULT;
902 * The SIMD FPU exceptions are handled a little differently, as there
903 * is only a single status/control register. Thus, to determine which
904 * unmasked exception was caught we must mask the exception mask bits
905 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
907 mxcsr = get_fpu_mxcsr(task);
908 switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
912 case 0x001: /* Invalid Op */
913 info.si_code = FPE_FLTINV;
915 case 0x002: /* Denormalize */
916 case 0x010: /* Underflow */
917 info.si_code = FPE_FLTUND;
919 case 0x004: /* Zero Divide */
920 info.si_code = FPE_FLTDIV;
922 case 0x008: /* Overflow */
923 info.si_code = FPE_FLTOVF;
925 case 0x020: /* Precision */
926 info.si_code = FPE_FLTRES;
929 force_sig_info(SIGFPE, &info, task);
932 asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
936 asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
940 asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
945 * 'math_state_restore()' saves the current math information in the
946 * old math state array, and gets the new ones from the current task
948 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
949 * Don't touch unless you *really* know how it works.
951 asmlinkage void math_state_restore(void)
953 struct task_struct *me = current;
954 clts(); /* Allow maths ops (or we recurse) */
958 restore_fpu_checking(&me->thread.i387.fxsave);
959 task_thread_info(me)->status |= TS_USEDFPU;
962 void __init trap_init(void)
964 set_intr_gate(0,÷_error);
965 set_intr_gate_ist(1,&debug,DEBUG_STACK);
966 set_intr_gate_ist(2,&nmi,NMI_STACK);
967 set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */
968 set_system_gate(4,&overflow); /* int4 can be called from all */
969 set_intr_gate(5,&bounds);
970 set_intr_gate(6,&invalid_op);
971 set_intr_gate(7,&device_not_available);
972 set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
973 set_intr_gate(9,&coprocessor_segment_overrun);
974 set_intr_gate(10,&invalid_TSS);
975 set_intr_gate(11,&segment_not_present);
976 set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK);
977 set_intr_gate(13,&general_protection);
978 set_intr_gate(14,&page_fault);
979 set_intr_gate(15,&spurious_interrupt_bug);
980 set_intr_gate(16,&coprocessor_error);
981 set_intr_gate(17,&alignment_check);
982 #ifdef CONFIG_X86_MCE
983 set_intr_gate_ist(18,&machine_check, MCE_STACK);
985 set_intr_gate(19,&simd_coprocessor_error);
987 #ifdef CONFIG_IA32_EMULATION
988 set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
992 * Should be a barrier for any external CPU state.
998 /* Actual parsing is done early in setup.c. */
999 static int __init oops_dummy(char *s)
1004 __setup("oops=", oops_dummy);
1006 static int __init kstack_setup(char *s)
1008 kstack_depth_to_print = simple_strtoul(s,NULL,0);
1011 __setup("kstack=", kstack_setup);