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 extern struct gate_struct idt_table[256];
52 asmlinkage void divide_error(void);
53 asmlinkage void debug(void);
54 asmlinkage void nmi(void);
55 asmlinkage void int3(void);
56 asmlinkage void overflow(void);
57 asmlinkage void bounds(void);
58 asmlinkage void invalid_op(void);
59 asmlinkage void device_not_available(void);
60 asmlinkage void double_fault(void);
61 asmlinkage void coprocessor_segment_overrun(void);
62 asmlinkage void invalid_TSS(void);
63 asmlinkage void segment_not_present(void);
64 asmlinkage void stack_segment(void);
65 asmlinkage void general_protection(void);
66 asmlinkage void page_fault(void);
67 asmlinkage void coprocessor_error(void);
68 asmlinkage void simd_coprocessor_error(void);
69 asmlinkage void reserved(void);
70 asmlinkage void alignment_check(void);
71 asmlinkage void machine_check(void);
72 asmlinkage void spurious_interrupt_bug(void);
73 asmlinkage void call_debug(void);
75 struct notifier_block *die_chain;
76 static DEFINE_SPINLOCK(die_notifier_lock);
78 int register_die_notifier(struct notifier_block *nb)
82 spin_lock_irqsave(&die_notifier_lock, flags);
83 err = notifier_chain_register(&die_chain, nb);
84 spin_unlock_irqrestore(&die_notifier_lock, flags);
88 static inline void conditional_sti(struct pt_regs *regs)
90 if (regs->eflags & X86_EFLAGS_IF)
94 static int kstack_depth_to_print = 10;
96 #ifdef CONFIG_KALLSYMS
97 #include <linux/kallsyms.h>
98 int printk_address(unsigned long address)
100 unsigned long offset = 0, symsize;
106 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
108 return printk("[<%016lx>]", address);
110 modname = delim = "";
111 return printk("<%016lx>{%s%s%s%s%+ld}",
112 address,delim,modname,delim,symname,offset);
115 int printk_address(unsigned long address)
117 return printk("[<%016lx>]", address);
121 static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
122 unsigned *usedp, const char **idp)
124 static char ids[][8] = {
125 [DEBUG_STACK - 1] = "#DB",
126 [NMI_STACK - 1] = "NMI",
127 [DOUBLEFAULT_STACK - 1] = "#DF",
128 [STACKFAULT_STACK - 1] = "#SS",
129 [MCE_STACK - 1] = "#MC",
130 #if DEBUG_STKSZ > EXCEPTION_STKSZ
131 [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
136 for (k = 0; k < N_EXCEPTION_STACKS; k++) {
140 #if DEBUG_STKSZ > EXCEPTION_STKSZ
142 end = cpu_pda[cpu].debugstack + DEBUG_STKSZ;
146 end = per_cpu(init_tss, cpu).ist[k];
151 if (stack >= end - EXCEPTION_STKSZ) {
152 if (*usedp & (1U << k))
156 return (unsigned long *)end;
158 #if DEBUG_STKSZ > EXCEPTION_STKSZ
159 if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
160 unsigned j = N_EXCEPTION_STACKS - 1;
164 end -= EXCEPTION_STKSZ;
165 ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
166 } while (stack < end - EXCEPTION_STKSZ);
167 if (*usedp & (1U << j))
171 return (unsigned long *)end;
179 * x86-64 can have upto three kernel stacks:
182 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
185 void show_trace(unsigned long *stack)
188 const unsigned cpu = safe_smp_processor_id();
189 unsigned long *irqstack_end = (unsigned long *)cpu_pda[cpu].irqstackptr;
193 printk("\nCall Trace:");
195 #define HANDLE_STACK(cond) \
198 if (kernel_text_address(addr)) { \
200 * If the address is either in the text segment of the \
201 * kernel, or in the region which contains vmalloc'ed \
202 * memory, it *may* be the address of a calling \
203 * routine; if so, print it so that someone tracing \
204 * down the cause of the crash will be able to figure \
205 * out the call path that was taken. \
207 i += printk_address(addr); \
219 unsigned long *estack_end;
220 estack_end = in_exception_stack(cpu, (unsigned long)stack,
224 i += printk(" <%s> ", id);
225 HANDLE_STACK (stack < estack_end);
226 i += printk(" <EOE> ");
227 stack = (unsigned long *) estack_end[-2];
231 unsigned long *irqstack;
232 irqstack = irqstack_end -
233 (IRQSTACKSIZE - 64) / sizeof(*irqstack);
235 if (stack >= irqstack && stack < irqstack_end) {
236 i += printk(" <IRQ> ");
237 HANDLE_STACK (stack < irqstack_end);
238 stack = (unsigned long *) (irqstack_end[-1]);
240 i += printk(" <EOI> ");
247 HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
252 void show_stack(struct task_struct *tsk, unsigned long * rsp)
254 unsigned long *stack;
256 const int cpu = safe_smp_processor_id();
257 unsigned long *irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
258 unsigned long *irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE);
260 // debugging aid: "show_stack(NULL, NULL);" prints the
261 // back trace for this cpu.
265 rsp = (unsigned long *)tsk->thread.rsp;
267 rsp = (unsigned long *)&rsp;
271 for(i=0; i < kstack_depth_to_print; i++) {
272 if (stack >= irqstack && stack <= irqstack_end) {
273 if (stack == irqstack_end) {
274 stack = (unsigned long *) (irqstack_end[-1]);
278 if (((long) stack & (THREAD_SIZE-1)) == 0)
281 if (i && ((i % 4) == 0))
283 printk("%016lx ", *stack++);
284 touch_nmi_watchdog();
286 show_trace((unsigned long *)rsp);
290 * The architecture-independent dump_stack generator
292 void dump_stack(void)
298 EXPORT_SYMBOL(dump_stack);
300 void show_registers(struct pt_regs *regs)
303 int in_kernel = !user_mode(regs);
305 const int cpu = safe_smp_processor_id();
306 struct task_struct *cur = cpu_pda[cpu].pcurrent;
310 printk("CPU %d ", cpu);
312 printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
313 cur->comm, cur->pid, cur->thread_info, cur);
316 * When in-kernel, we also print out the stack and code at the
317 * time of the fault..
322 show_stack(NULL, (unsigned long*)rsp);
325 if(regs->rip < PAGE_OFFSET)
331 if(__get_user(c, &((unsigned char*)regs->rip)[i])) {
333 printk(" Bad RIP value.");
342 void handle_BUG(struct pt_regs *regs)
349 if (__copy_from_user(&f, (struct bug_frame *) regs->rip,
350 sizeof(struct bug_frame)))
352 if (f.filename >= 0 ||
353 f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
355 if (__get_user(tmp, (char *)(long)f.filename))
356 f.filename = (int)(long)"unmapped filename";
357 printk("----------- [cut here ] --------- [please bite here ] ---------\n");
358 printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", (char *)(long)f.filename, f.line);
362 void out_of_line_bug(void)
368 static DEFINE_SPINLOCK(die_lock);
369 static int die_owner = -1;
371 unsigned long oops_begin(void)
373 int cpu = safe_smp_processor_id();
376 /* racy, but better than risking deadlock. */
377 local_irq_save(flags);
378 if (!spin_trylock(&die_lock)) {
379 if (cpu == die_owner)
380 /* nested oops. should stop eventually */;
382 spin_lock(&die_lock);
390 void oops_end(unsigned long flags)
394 spin_unlock_irqrestore(&die_lock, flags);
399 void __die(const char * str, struct pt_regs * regs, long err)
401 static int die_counter;
402 printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
403 #ifdef CONFIG_PREEMPT
409 #ifdef CONFIG_DEBUG_PAGEALLOC
410 printk("DEBUG_PAGEALLOC");
413 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
414 show_registers(regs);
415 /* Executive summary in case the oops scrolled away */
416 printk(KERN_ALERT "RIP ");
417 printk_address(regs->rip);
418 printk(" RSP <%016lx>\n", regs->rsp);
421 void die(const char * str, struct pt_regs * regs, long err)
423 unsigned long flags = oops_begin();
426 __die(str, regs, err);
431 void die_nmi(char *str, struct pt_regs *regs)
433 unsigned long flags = oops_begin();
436 * We are in trouble anyway, lets at least try
437 * to get a message out.
439 printk(str, safe_smp_processor_id());
440 show_registers(regs);
441 if (panic_on_timeout || panic_on_oops)
442 panic("nmi watchdog");
443 printk("console shuts up ...\n");
448 static void __kprobes do_trap(int trapnr, int signr, char *str,
449 struct pt_regs * regs, long error_code,
452 struct task_struct *tsk = current;
454 conditional_sti(regs);
456 tsk->thread.error_code = error_code;
457 tsk->thread.trap_no = trapnr;
459 if (user_mode(regs)) {
460 if (exception_trace && unhandled_signal(tsk, signr))
462 "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
463 tsk->comm, tsk->pid, str,
464 regs->rip,regs->rsp,error_code);
467 force_sig_info(signr, info, tsk);
469 force_sig(signr, tsk);
476 const struct exception_table_entry *fixup;
477 fixup = search_exception_tables(regs->rip);
479 regs->rip = fixup->fixup;
481 die(str, regs, error_code);
486 #define DO_ERROR(trapnr, signr, str, name) \
487 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
489 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
492 do_trap(trapnr, signr, str, regs, error_code, NULL); \
495 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
496 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
499 info.si_signo = signr; \
501 info.si_code = sicode; \
502 info.si_addr = (void __user *)siaddr; \
503 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
506 do_trap(trapnr, signr, str, regs, error_code, &info); \
509 DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
510 DO_ERROR( 4, SIGSEGV, "overflow", overflow)
511 DO_ERROR( 5, SIGSEGV, "bounds", bounds)
512 DO_ERROR_INFO( 6, SIGILL, "invalid operand", invalid_op, ILL_ILLOPN, regs->rip)
513 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
514 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
515 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
516 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
517 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
518 DO_ERROR(18, SIGSEGV, "reserved", reserved)
519 DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
521 asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
523 static const char str[] = "double fault";
524 struct task_struct *tsk = current;
526 /* Return not checked because double check cannot be ignored */
527 notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
529 tsk->thread.error_code = error_code;
530 tsk->thread.trap_no = 8;
532 /* This is always a kernel trap and never fixable (and thus must
535 die(str, regs, error_code);
538 asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
541 struct task_struct *tsk = current;
543 conditional_sti(regs);
545 tsk->thread.error_code = error_code;
546 tsk->thread.trap_no = 13;
548 if (user_mode(regs)) {
549 if (exception_trace && unhandled_signal(tsk, SIGSEGV))
551 "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
553 regs->rip,regs->rsp,error_code);
555 force_sig(SIGSEGV, tsk);
561 const struct exception_table_entry *fixup;
562 fixup = search_exception_tables(regs->rip);
564 regs->rip = fixup->fixup;
567 if (notify_die(DIE_GPF, "general protection fault", regs,
568 error_code, 13, SIGSEGV) == NOTIFY_STOP)
570 die("general protection fault", regs, error_code);
574 static void mem_parity_error(unsigned char reason, struct pt_regs * regs)
576 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
577 printk("You probably have a hardware problem with your RAM chips\n");
579 /* Clear and disable the memory parity error line. */
580 reason = (reason & 0xf) | 4;
584 static void io_check_error(unsigned char reason, struct pt_regs * regs)
586 printk("NMI: IOCK error (debug interrupt?)\n");
587 show_registers(regs);
589 /* Re-enable the IOCK line, wait for a few seconds */
590 reason = (reason & 0xf) | 8;
597 static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
598 { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
599 printk("Dazed and confused, but trying to continue\n");
600 printk("Do you have a strange power saving mode enabled?\n");
603 /* Runs on IST stack. This code must keep interrupts off all the time.
604 Nested NMIs are prevented by the CPU. */
605 asmlinkage void default_do_nmi(struct pt_regs *regs)
607 unsigned char reason = 0;
610 cpu = smp_processor_id();
612 /* Only the BSP gets external NMIs from the system. */
614 reason = get_nmi_reason();
616 if (!(reason & 0xc0)) {
617 if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
620 #ifdef CONFIG_X86_LOCAL_APIC
622 * Ok, so this is none of the documented NMI sources,
623 * so it must be the NMI watchdog.
625 if (nmi_watchdog > 0) {
626 nmi_watchdog_tick(regs,reason);
630 unknown_nmi_error(reason, regs);
633 if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
636 /* AK: following checks seem to be broken on modern chipsets. FIXME */
639 mem_parity_error(reason, regs);
641 io_check_error(reason, regs);
644 /* runs on IST stack. */
645 asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
647 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
650 do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
654 /* Help handler running on IST stack to switch back to user stack
655 for scheduling or signal handling. The actual stack switch is done in
657 asmlinkage struct pt_regs *sync_regs(struct pt_regs *eregs)
659 struct pt_regs *regs = eregs;
660 /* Did already sync */
661 if (eregs == (struct pt_regs *)eregs->rsp)
663 /* Exception from user space */
664 else if (user_mode(eregs))
665 regs = ((struct pt_regs *)current->thread.rsp0) - 1;
666 /* Exception from kernel and interrupts are enabled. Move to
667 kernel process stack. */
668 else if (eregs->eflags & X86_EFLAGS_IF)
669 regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs));
675 /* runs on IST stack. */
676 asmlinkage void __kprobes do_debug(struct pt_regs * regs,
677 unsigned long error_code)
679 unsigned long condition;
680 struct task_struct *tsk = current;
683 get_debugreg(condition, 6);
685 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
686 SIGTRAP) == NOTIFY_STOP)
689 conditional_sti(regs);
691 /* Mask out spurious debug traps due to lazy DR7 setting */
692 if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
693 if (!tsk->thread.debugreg7) {
698 tsk->thread.debugreg6 = condition;
700 /* Mask out spurious TF errors due to lazy TF clearing */
701 if (condition & DR_STEP) {
703 * The TF error should be masked out only if the current
704 * process is not traced and if the TRAP flag has been set
705 * previously by a tracing process (condition detected by
706 * the PT_DTRACE flag); remember that the i386 TRAP flag
707 * can be modified by the process itself in user mode,
708 * allowing programs to debug themselves without the ptrace()
711 if (!user_mode(regs))
712 goto clear_TF_reenable;
714 * Was the TF flag set by a debugger? If so, clear it now,
715 * so that register information is correct.
717 if (tsk->ptrace & PT_DTRACE) {
718 regs->eflags &= ~TF_MASK;
719 tsk->ptrace &= ~PT_DTRACE;
723 /* Ok, finally something we can handle */
724 tsk->thread.trap_no = 1;
725 tsk->thread.error_code = error_code;
726 info.si_signo = SIGTRAP;
728 info.si_code = TRAP_BRKPT;
729 info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL;
730 force_sig_info(SIGTRAP, &info, tsk);
733 set_debugreg(0UL, 7);
737 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
738 regs->eflags &= ~TF_MASK;
741 static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
743 const struct exception_table_entry *fixup;
744 fixup = search_exception_tables(regs->rip);
746 regs->rip = fixup->fixup;
749 notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
750 /* Illegal floating point operation in the kernel */
751 current->thread.trap_no = trapnr;
757 * Note that we play around with the 'TS' bit in an attempt to get
758 * the correct behaviour even in the presence of the asynchronous
761 asmlinkage void do_coprocessor_error(struct pt_regs *regs)
763 void __user *rip = (void __user *)(regs->rip);
764 struct task_struct * task;
766 unsigned short cwd, swd;
768 conditional_sti(regs);
769 if (!user_mode(regs) &&
770 kernel_math_error(regs, "kernel x87 math error", 16))
774 * Save the info for the exception handler and clear the error.
778 task->thread.trap_no = 16;
779 task->thread.error_code = 0;
780 info.si_signo = SIGFPE;
782 info.si_code = __SI_FAULT;
785 * (~cwd & swd) will mask out exceptions that are not set to unmasked
786 * status. 0x3f is the exception bits in these regs, 0x200 is the
787 * C1 reg you need in case of a stack fault, 0x040 is the stack
788 * fault bit. We should only be taking one exception at a time,
789 * so if this combination doesn't produce any single exception,
790 * then we have a bad program that isn't synchronizing its FPU usage
791 * and it will suffer the consequences since we won't be able to
792 * fully reproduce the context of the exception
794 cwd = get_fpu_cwd(task);
795 swd = get_fpu_swd(task);
796 switch (swd & ~cwd & 0x3f) {
800 case 0x001: /* Invalid Op */
802 * swd & 0x240 == 0x040: Stack Underflow
803 * swd & 0x240 == 0x240: Stack Overflow
804 * User must clear the SF bit (0x40) if set
806 info.si_code = FPE_FLTINV;
808 case 0x002: /* Denormalize */
809 case 0x010: /* Underflow */
810 info.si_code = FPE_FLTUND;
812 case 0x004: /* Zero Divide */
813 info.si_code = FPE_FLTDIV;
815 case 0x008: /* Overflow */
816 info.si_code = FPE_FLTOVF;
818 case 0x020: /* Precision */
819 info.si_code = FPE_FLTRES;
822 force_sig_info(SIGFPE, &info, task);
825 asmlinkage void bad_intr(void)
827 printk("bad interrupt");
830 asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
832 void __user *rip = (void __user *)(regs->rip);
833 struct task_struct * task;
835 unsigned short mxcsr;
837 conditional_sti(regs);
838 if (!user_mode(regs) &&
839 kernel_math_error(regs, "kernel simd math error", 19))
843 * Save the info for the exception handler and clear the error.
847 task->thread.trap_no = 19;
848 task->thread.error_code = 0;
849 info.si_signo = SIGFPE;
851 info.si_code = __SI_FAULT;
854 * The SIMD FPU exceptions are handled a little differently, as there
855 * is only a single status/control register. Thus, to determine which
856 * unmasked exception was caught we must mask the exception mask bits
857 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
859 mxcsr = get_fpu_mxcsr(task);
860 switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
864 case 0x001: /* Invalid Op */
865 info.si_code = FPE_FLTINV;
867 case 0x002: /* Denormalize */
868 case 0x010: /* Underflow */
869 info.si_code = FPE_FLTUND;
871 case 0x004: /* Zero Divide */
872 info.si_code = FPE_FLTDIV;
874 case 0x008: /* Overflow */
875 info.si_code = FPE_FLTOVF;
877 case 0x020: /* Precision */
878 info.si_code = FPE_FLTRES;
881 force_sig_info(SIGFPE, &info, task);
884 asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
888 asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
892 asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
897 * 'math_state_restore()' saves the current math information in the
898 * old math state array, and gets the new ones from the current task
900 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
901 * Don't touch unless you *really* know how it works.
903 asmlinkage void math_state_restore(void)
905 struct task_struct *me = current;
906 clts(); /* Allow maths ops (or we recurse) */
910 restore_fpu_checking(&me->thread.i387.fxsave);
911 me->thread_info->status |= TS_USEDFPU;
914 void do_call_debug(struct pt_regs *regs)
916 notify_die(DIE_CALL, "debug call", regs, 0, 255, SIGINT);
919 void __init trap_init(void)
921 set_intr_gate(0,÷_error);
922 set_intr_gate_ist(1,&debug,DEBUG_STACK);
923 set_intr_gate_ist(2,&nmi,NMI_STACK);
924 set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */
925 set_system_gate(4,&overflow); /* int4 can be called from all */
926 set_intr_gate(5,&bounds);
927 set_intr_gate(6,&invalid_op);
928 set_intr_gate(7,&device_not_available);
929 set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
930 set_intr_gate(9,&coprocessor_segment_overrun);
931 set_intr_gate(10,&invalid_TSS);
932 set_intr_gate(11,&segment_not_present);
933 set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK);
934 set_intr_gate(13,&general_protection);
935 set_intr_gate(14,&page_fault);
936 set_intr_gate(15,&spurious_interrupt_bug);
937 set_intr_gate(16,&coprocessor_error);
938 set_intr_gate(17,&alignment_check);
939 #ifdef CONFIG_X86_MCE
940 set_intr_gate_ist(18,&machine_check, MCE_STACK);
942 set_intr_gate(19,&simd_coprocessor_error);
944 #ifdef CONFIG_IA32_EMULATION
945 set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
948 set_intr_gate(KDB_VECTOR, call_debug);
951 * Should be a barrier for any external CPU state.
957 /* Actual parsing is done early in setup.c. */
958 static int __init oops_dummy(char *s)
963 __setup("oops=", oops_dummy);
965 static int __init kstack_setup(char *s)
967 kstack_depth_to_print = simple_strtoul(s,NULL,0);
970 __setup("kstack=", kstack_setup);