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
10 * $Id: traps.c,v 1.36 2002/03/24 11:09:10 ak Exp $
14 * 'Traps.c' handles hardware traps and faults after we have saved some
17 #include <linux/config.h>
18 #include <linux/sched.h>
19 #include <linux/kernel.h>
20 #include <linux/string.h>
21 #include <linux/errno.h>
22 #include <linux/ptrace.h>
23 #include <linux/timer.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/spinlock.h>
28 #include <linux/interrupt.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/nmi.h>
32 #include <linux/kprobes.h>
34 #include <asm/system.h>
35 #include <asm/uaccess.h>
37 #include <asm/atomic.h>
38 #include <asm/debugreg.h>
41 #include <asm/kdebug.h>
42 #include <asm/processor.h>
45 #include <asm/pgalloc.h>
47 #include <asm/proto.h>
50 #include <linux/irq.h>
53 extern struct gate_struct idt_table[256];
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 asmlinkage void call_debug(void);
78 struct notifier_block *die_chain;
79 static DEFINE_SPINLOCK(die_notifier_lock);
81 int register_die_notifier(struct notifier_block *nb)
85 spin_lock_irqsave(&die_notifier_lock, flags);
86 err = notifier_chain_register(&die_chain, nb);
87 spin_unlock_irqrestore(&die_notifier_lock, flags);
91 static inline void conditional_sti(struct pt_regs *regs)
93 if (regs->eflags & X86_EFLAGS_IF)
97 static int kstack_depth_to_print = 10;
99 #ifdef CONFIG_KALLSYMS
100 #include <linux/kallsyms.h>
101 int printk_address(unsigned long address)
103 unsigned long offset = 0, symsize;
109 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
111 return printk("[<%016lx>]", address);
113 modname = delim = "";
114 return printk("<%016lx>{%s%s%s%s%+ld}",
115 address,delim,modname,delim,symname,offset);
118 int printk_address(unsigned long address)
120 return printk("[<%016lx>]", address);
124 static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
125 unsigned *usedp, const char **idp)
127 static const char ids[N_EXCEPTION_STACKS][8] = {
128 [DEBUG_STACK - 1] = "#DB",
129 [NMI_STACK - 1] = "NMI",
130 [DOUBLEFAULT_STACK - 1] = "#DF",
131 [STACKFAULT_STACK - 1] = "#SS",
132 [MCE_STACK - 1] = "#MC",
136 for (k = 0; k < N_EXCEPTION_STACKS; k++) {
139 end = per_cpu(init_tss, cpu).ist[k];
142 if (stack >= end - EXCEPTION_STKSZ) {
143 if (*usedp & (1U << k))
147 return (unsigned long *)end;
154 * x86-64 can have upto three kernel stacks:
157 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
160 void show_trace(unsigned long *stack)
163 const unsigned cpu = safe_smp_processor_id();
164 unsigned long *irqstack_end = (unsigned long *)cpu_pda[cpu].irqstackptr;
168 printk("\nCall Trace:");
170 #define HANDLE_STACK(cond) \
173 if (kernel_text_address(addr)) { \
175 * If the address is either in the text segment of the \
176 * kernel, or in the region which contains vmalloc'ed \
177 * memory, it *may* be the address of a calling \
178 * routine; if so, print it so that someone tracing \
179 * down the cause of the crash will be able to figure \
180 * out the call path that was taken. \
182 i += printk_address(addr); \
194 unsigned long *estack_end;
195 estack_end = in_exception_stack(cpu, (unsigned long)stack,
199 i += printk(" <%s> ", id);
200 HANDLE_STACK (stack < estack_end);
201 i += printk(" <EOE> ");
202 stack = (unsigned long *) estack_end[-2];
206 unsigned long *irqstack;
207 irqstack = irqstack_end -
208 (IRQSTACKSIZE - 64) / sizeof(*irqstack);
210 if (stack >= irqstack && stack < irqstack_end) {
211 i += printk(" <IRQ> ");
212 HANDLE_STACK (stack < irqstack_end);
213 stack = (unsigned long *) (irqstack_end[-1]);
215 i += printk(" <EOI> ");
222 HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
227 void show_stack(struct task_struct *tsk, unsigned long * rsp)
229 unsigned long *stack;
231 const int cpu = safe_smp_processor_id();
232 unsigned long *irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
233 unsigned long *irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE);
235 // debugging aid: "show_stack(NULL, NULL);" prints the
236 // back trace for this cpu.
240 rsp = (unsigned long *)tsk->thread.rsp;
242 rsp = (unsigned long *)&rsp;
246 for(i=0; i < kstack_depth_to_print; i++) {
247 if (stack >= irqstack && stack <= irqstack_end) {
248 if (stack == irqstack_end) {
249 stack = (unsigned long *) (irqstack_end[-1]);
253 if (((long) stack & (THREAD_SIZE-1)) == 0)
256 if (i && ((i % 4) == 0))
258 printk("%016lx ", *stack++);
259 touch_nmi_watchdog();
261 show_trace((unsigned long *)rsp);
265 * The architecture-independent dump_stack generator
267 void dump_stack(void)
273 EXPORT_SYMBOL(dump_stack);
275 void show_registers(struct pt_regs *regs)
278 int in_kernel = !user_mode(regs);
280 const int cpu = safe_smp_processor_id();
281 struct task_struct *cur = cpu_pda[cpu].pcurrent;
285 printk("CPU %d ", cpu);
287 printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
288 cur->comm, cur->pid, cur->thread_info, cur);
291 * When in-kernel, we also print out the stack and code at the
292 * time of the fault..
297 show_stack(NULL, (unsigned long*)rsp);
300 if(regs->rip < PAGE_OFFSET)
306 if(__get_user(c, &((unsigned char*)regs->rip)[i])) {
308 printk(" Bad RIP value.");
317 void handle_BUG(struct pt_regs *regs)
324 if (__copy_from_user(&f, (struct bug_frame *) regs->rip,
325 sizeof(struct bug_frame)))
327 if ((unsigned long)f.filename < __PAGE_OFFSET ||
328 f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
330 if (__get_user(tmp, f.filename))
331 f.filename = "unmapped filename";
332 printk("----------- [cut here ] --------- [please bite here ] ---------\n");
333 printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", f.filename, f.line);
337 void out_of_line_bug(void)
343 static DEFINE_SPINLOCK(die_lock);
344 static int die_owner = -1;
346 unsigned long oops_begin(void)
348 int cpu = safe_smp_processor_id();
351 /* racy, but better than risking deadlock. */
352 local_irq_save(flags);
353 if (!spin_trylock(&die_lock)) {
354 if (cpu == die_owner)
355 /* nested oops. should stop eventually */;
357 spin_lock(&die_lock);
365 void oops_end(unsigned long flags)
369 spin_unlock_irqrestore(&die_lock, flags);
374 void __die(const char * str, struct pt_regs * regs, long err)
376 static int die_counter;
377 printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
378 #ifdef CONFIG_PREEMPT
384 #ifdef CONFIG_DEBUG_PAGEALLOC
385 printk("DEBUG_PAGEALLOC");
388 notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
389 show_registers(regs);
390 /* Executive summary in case the oops scrolled away */
391 printk(KERN_ALERT "RIP ");
392 printk_address(regs->rip);
393 printk(" RSP <%016lx>\n", regs->rsp);
396 void die(const char * str, struct pt_regs * regs, long err)
398 unsigned long flags = oops_begin();
401 __die(str, regs, err);
405 static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
407 if (!(regs->eflags & VM_MASK) && (regs->cs == __KERNEL_CS))
411 void die_nmi(char *str, struct pt_regs *regs)
413 unsigned long flags = oops_begin();
416 * We are in trouble anyway, lets at least try
417 * to get a message out.
419 printk(str, safe_smp_processor_id());
420 show_registers(regs);
421 if (panic_on_timeout || panic_on_oops)
422 panic("nmi watchdog");
423 printk("console shuts up ...\n");
428 static void __kprobes do_trap(int trapnr, int signr, char *str,
429 struct pt_regs * regs, long error_code,
432 conditional_sti(regs);
434 #ifdef CONFIG_CHECKING
437 struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
438 rdmsrl(MSR_GS_BASE, gs);
439 if (gs != (unsigned long)pda) {
440 wrmsrl(MSR_GS_BASE, pda);
441 printk("%s: wrong gs %lx expected %p rip %lx\n", str, gs, pda,
447 if (user_mode(regs)) {
448 struct task_struct *tsk = current;
450 if (exception_trace && unhandled_signal(tsk, signr))
452 "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
453 tsk->comm, tsk->pid, str,
454 regs->rip,regs->rsp,error_code);
456 tsk->thread.error_code = error_code;
457 tsk->thread.trap_no = trapnr;
459 force_sig_info(signr, info, tsk);
461 force_sig(signr, tsk);
468 const struct exception_table_entry *fixup;
469 fixup = search_exception_tables(regs->rip);
471 regs->rip = fixup->fixup;
473 die(str, regs, error_code);
478 #define DO_ERROR(trapnr, signr, str, name) \
479 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
481 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
484 do_trap(trapnr, signr, str, regs, error_code, NULL); \
487 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
488 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
491 info.si_signo = signr; \
493 info.si_code = sicode; \
494 info.si_addr = (void __user *)siaddr; \
495 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
498 do_trap(trapnr, signr, str, regs, error_code, &info); \
501 DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
502 DO_ERROR( 4, SIGSEGV, "overflow", overflow)
503 DO_ERROR( 5, SIGSEGV, "bounds", bounds)
504 DO_ERROR_INFO( 6, SIGILL, "invalid operand", invalid_op, ILL_ILLOPN, regs->rip)
505 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
506 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
507 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
508 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
509 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
510 DO_ERROR(18, SIGSEGV, "reserved", reserved)
511 DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
512 DO_ERROR( 8, SIGSEGV, "double fault", double_fault)
514 asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
517 conditional_sti(regs);
519 #ifdef CONFIG_CHECKING
522 struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
523 rdmsrl(MSR_GS_BASE, gs);
524 if (gs != (unsigned long)pda) {
525 wrmsrl(MSR_GS_BASE, pda);
527 printk("general protection handler: wrong gs %lx expected %p\n", gs, pda);
533 if (user_mode(regs)) {
534 struct task_struct *tsk = current;
536 if (exception_trace && unhandled_signal(tsk, SIGSEGV))
538 "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
540 regs->rip,regs->rsp,error_code);
542 tsk->thread.error_code = error_code;
543 tsk->thread.trap_no = 13;
544 force_sig(SIGSEGV, tsk);
550 const struct exception_table_entry *fixup;
551 fixup = search_exception_tables(regs->rip);
553 regs->rip = fixup->fixup;
556 if (notify_die(DIE_GPF, "general protection fault", regs,
557 error_code, 13, SIGSEGV) == NOTIFY_STOP)
559 die("general protection fault", regs, error_code);
563 static void mem_parity_error(unsigned char reason, struct pt_regs * regs)
565 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
566 printk("You probably have a hardware problem with your RAM chips\n");
568 /* Clear and disable the memory parity error line. */
569 reason = (reason & 0xf) | 4;
573 static void io_check_error(unsigned char reason, struct pt_regs * regs)
575 printk("NMI: IOCK error (debug interrupt?)\n");
576 show_registers(regs);
578 /* Re-enable the IOCK line, wait for a few seconds */
579 reason = (reason & 0xf) | 8;
586 static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
587 { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
588 printk("Dazed and confused, but trying to continue\n");
589 printk("Do you have a strange power saving mode enabled?\n");
592 /* Runs on IST stack. This code must keep interrupts off all the time.
593 Nested NMIs are prevented by the CPU. */
594 asmlinkage void default_do_nmi(struct pt_regs *regs)
596 unsigned char reason = 0;
599 cpu = smp_processor_id();
601 /* Only the BSP gets external NMIs from the system. */
603 reason = get_nmi_reason();
605 if (!(reason & 0xc0)) {
606 if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 0, SIGINT)
609 #ifdef CONFIG_X86_LOCAL_APIC
611 * Ok, so this is none of the documented NMI sources,
612 * so it must be the NMI watchdog.
614 if (nmi_watchdog > 0) {
615 nmi_watchdog_tick(regs,reason);
619 unknown_nmi_error(reason, regs);
622 if (notify_die(DIE_NMI, "nmi", regs, reason, 0, SIGINT) == NOTIFY_STOP)
625 /* AK: following checks seem to be broken on modern chipsets. FIXME */
628 mem_parity_error(reason, regs);
630 io_check_error(reason, regs);
633 asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
635 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
638 do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
642 /* Help handler running on IST stack to switch back to user stack
643 for scheduling or signal handling. The actual stack switch is done in
645 asmlinkage struct pt_regs *sync_regs(struct pt_regs *eregs)
647 struct pt_regs *regs = eregs;
648 /* Did already sync */
649 if (eregs == (struct pt_regs *)eregs->rsp)
651 /* Exception from user space */
652 else if (user_mode(eregs))
653 regs = ((struct pt_regs *)current->thread.rsp0) - 1;
654 /* Exception from kernel and interrupts are enabled. Move to
655 kernel process stack. */
656 else if (eregs->eflags & X86_EFLAGS_IF)
657 regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs));
663 /* runs on IST stack. */
664 asmlinkage void __kprobes do_debug(struct pt_regs * regs,
665 unsigned long error_code)
667 unsigned long condition;
668 struct task_struct *tsk = current;
671 #ifdef CONFIG_CHECKING
673 /* RED-PEN interaction with debugger - could destroy gs */
675 struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
676 rdmsrl(MSR_GS_BASE, gs);
677 if (gs != (unsigned long)pda) {
678 wrmsrl(MSR_GS_BASE, pda);
679 printk("debug handler: wrong gs %lx expected %p\n", gs, pda);
684 get_debugreg(condition, 6);
686 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
687 SIGTRAP) == NOTIFY_STOP)
690 conditional_sti(regs);
692 /* Mask out spurious debug traps due to lazy DR7 setting */
693 if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
694 if (!tsk->thread.debugreg7) {
699 tsk->thread.debugreg6 = condition;
701 /* Mask out spurious TF errors due to lazy TF clearing */
702 if (condition & DR_STEP) {
704 * The TF error should be masked out only if the current
705 * process is not traced and if the TRAP flag has been set
706 * previously by a tracing process (condition detected by
707 * the PT_DTRACE flag); remember that the i386 TRAP flag
708 * can be modified by the process itself in user mode,
709 * allowing programs to debug themselves without the ptrace()
712 if (!user_mode(regs))
713 goto clear_TF_reenable;
715 * Was the TF flag set by a debugger? If so, clear it now,
716 * so that register information is correct.
718 if (tsk->ptrace & PT_DTRACE) {
719 regs->eflags &= ~TF_MASK;
720 tsk->ptrace &= ~PT_DTRACE;
724 /* Ok, finally something we can handle */
725 tsk->thread.trap_no = 1;
726 tsk->thread.error_code = error_code;
727 info.si_signo = SIGTRAP;
729 info.si_code = TRAP_BRKPT;
730 if (!user_mode(regs))
733 info.si_addr = (void __user *)regs->rip;
734 force_sig_info(SIGTRAP, &info, tsk);
736 set_debugreg(0UL, 7);
740 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
741 regs->eflags &= ~TF_MASK;
744 static int kernel_math_error(struct pt_regs *regs, char *str)
746 const struct exception_table_entry *fixup;
747 fixup = search_exception_tables(regs->rip);
749 regs->rip = fixup->fixup;
752 notify_die(DIE_GPF, str, regs, 0, 16, SIGFPE);
753 /* Illegal floating point operation in the kernel */
759 * Note that we play around with the 'TS' bit in an attempt to get
760 * the correct behaviour even in the presence of the asynchronous
763 asmlinkage void do_coprocessor_error(struct pt_regs *regs)
765 void __user *rip = (void __user *)(regs->rip);
766 struct task_struct * task;
768 unsigned short cwd, swd;
770 conditional_sti(regs);
771 if (!user_mode(regs) &&
772 kernel_math_error(regs, "kernel x87 math error"))
776 * Save the info for the exception handler and clear the error.
780 task->thread.trap_no = 16;
781 task->thread.error_code = 0;
782 info.si_signo = SIGFPE;
784 info.si_code = __SI_FAULT;
787 * (~cwd & swd) will mask out exceptions that are not set to unmasked
788 * status. 0x3f is the exception bits in these regs, 0x200 is the
789 * C1 reg you need in case of a stack fault, 0x040 is the stack
790 * fault bit. We should only be taking one exception at a time,
791 * so if this combination doesn't produce any single exception,
792 * then we have a bad program that isn't synchronizing its FPU usage
793 * and it will suffer the consequences since we won't be able to
794 * fully reproduce the context of the exception
796 cwd = get_fpu_cwd(task);
797 swd = get_fpu_swd(task);
798 switch (((~cwd) & swd & 0x3f) | (swd & 0x240)) {
802 case 0x001: /* Invalid Op */
803 case 0x041: /* Stack Fault */
804 case 0x241: /* Stack Fault | Direction */
805 info.si_code = FPE_FLTINV;
807 case 0x002: /* Denormalize */
808 case 0x010: /* Underflow */
809 info.si_code = FPE_FLTUND;
811 case 0x004: /* Zero Divide */
812 info.si_code = FPE_FLTDIV;
814 case 0x008: /* Overflow */
815 info.si_code = FPE_FLTOVF;
817 case 0x020: /* Precision */
818 info.si_code = FPE_FLTRES;
821 force_sig_info(SIGFPE, &info, task);
824 asmlinkage void bad_intr(void)
826 printk("bad interrupt");
829 asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
831 void __user *rip = (void __user *)(regs->rip);
832 struct task_struct * task;
834 unsigned short mxcsr;
836 conditional_sti(regs);
837 if (!user_mode(regs) &&
838 kernel_math_error(regs, "kernel simd math error"))
842 * Save the info for the exception handler and clear the error.
846 task->thread.trap_no = 19;
847 task->thread.error_code = 0;
848 info.si_signo = SIGFPE;
850 info.si_code = __SI_FAULT;
853 * The SIMD FPU exceptions are handled a little differently, as there
854 * is only a single status/control register. Thus, to determine which
855 * unmasked exception was caught we must mask the exception mask bits
856 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
858 mxcsr = get_fpu_mxcsr(task);
859 switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
863 case 0x001: /* Invalid Op */
864 info.si_code = FPE_FLTINV;
866 case 0x002: /* Denormalize */
867 case 0x010: /* Underflow */
868 info.si_code = FPE_FLTUND;
870 case 0x004: /* Zero Divide */
871 info.si_code = FPE_FLTDIV;
873 case 0x008: /* Overflow */
874 info.si_code = FPE_FLTOVF;
876 case 0x020: /* Precision */
877 info.si_code = FPE_FLTRES;
880 force_sig_info(SIGFPE, &info, task);
883 asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
887 asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
892 * 'math_state_restore()' saves the current math information in the
893 * old math state array, and gets the new ones from the current task
895 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
896 * Don't touch unless you *really* know how it works.
898 asmlinkage void math_state_restore(void)
900 struct task_struct *me = current;
901 clts(); /* Allow maths ops (or we recurse) */
905 restore_fpu_checking(&me->thread.i387.fxsave);
906 me->thread_info->status |= TS_USEDFPU;
909 void do_call_debug(struct pt_regs *regs)
911 notify_die(DIE_CALL, "debug call", regs, 0, 255, SIGINT);
914 void __init trap_init(void)
916 set_intr_gate(0,÷_error);
917 set_intr_gate_ist(1,&debug,DEBUG_STACK);
918 set_intr_gate_ist(2,&nmi,NMI_STACK);
919 set_system_gate(3,&int3);
920 set_system_gate(4,&overflow); /* int4-5 can be called from all */
921 set_system_gate(5,&bounds);
922 set_intr_gate(6,&invalid_op);
923 set_intr_gate(7,&device_not_available);
924 set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
925 set_intr_gate(9,&coprocessor_segment_overrun);
926 set_intr_gate(10,&invalid_TSS);
927 set_intr_gate(11,&segment_not_present);
928 set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK);
929 set_intr_gate(13,&general_protection);
930 set_intr_gate(14,&page_fault);
931 set_intr_gate(15,&spurious_interrupt_bug);
932 set_intr_gate(16,&coprocessor_error);
933 set_intr_gate(17,&alignment_check);
934 #ifdef CONFIG_X86_MCE
935 set_intr_gate_ist(18,&machine_check, MCE_STACK);
937 set_intr_gate(19,&simd_coprocessor_error);
939 #ifdef CONFIG_IA32_EMULATION
940 set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
943 set_intr_gate(KDB_VECTOR, call_debug);
946 * Should be a barrier for any external CPU state.
952 /* Actual parsing is done early in setup.c. */
953 static int __init oops_dummy(char *s)
958 __setup("oops=", oops_dummy);
960 static int __init kstack_setup(char *s)
962 kstack_depth_to_print = simple_strtoul(s,NULL,0);
965 __setup("kstack=", kstack_setup);