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);
74 struct notifier_block *die_chain;
75 static DEFINE_SPINLOCK(die_notifier_lock);
77 int register_die_notifier(struct notifier_block *nb)
81 spin_lock_irqsave(&die_notifier_lock, flags);
82 err = notifier_chain_register(&die_chain, nb);
83 spin_unlock_irqrestore(&die_notifier_lock, flags);
87 static inline void conditional_sti(struct pt_regs *regs)
89 if (regs->eflags & X86_EFLAGS_IF)
93 static int kstack_depth_to_print = 10;
95 #ifdef CONFIG_KALLSYMS
96 #include <linux/kallsyms.h>
97 int printk_address(unsigned long address)
99 unsigned long offset = 0, symsize;
105 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
107 return printk("[<%016lx>]", address);
109 modname = delim = "";
110 return printk("<%016lx>{%s%s%s%s%+ld}",
111 address,delim,modname,delim,symname,offset);
114 int printk_address(unsigned long address)
116 return printk("[<%016lx>]", address);
120 static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
121 unsigned *usedp, const char **idp)
123 static char ids[][8] = {
124 [DEBUG_STACK - 1] = "#DB",
125 [NMI_STACK - 1] = "NMI",
126 [DOUBLEFAULT_STACK - 1] = "#DF",
127 [STACKFAULT_STACK - 1] = "#SS",
128 [MCE_STACK - 1] = "#MC",
129 #if DEBUG_STKSZ > EXCEPTION_STKSZ
130 [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
135 for (k = 0; k < N_EXCEPTION_STACKS; k++) {
139 #if DEBUG_STKSZ > EXCEPTION_STKSZ
141 end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ;
145 end = per_cpu(init_tss, cpu).ist[k];
150 if (stack >= end - EXCEPTION_STKSZ) {
151 if (*usedp & (1U << k))
155 return (unsigned long *)end;
157 #if DEBUG_STKSZ > EXCEPTION_STKSZ
158 if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
159 unsigned j = N_EXCEPTION_STACKS - 1;
163 end -= EXCEPTION_STKSZ;
164 ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
165 } while (stack < end - EXCEPTION_STKSZ);
166 if (*usedp & (1U << j))
170 return (unsigned long *)end;
178 * x86-64 can have upto three kernel stacks:
181 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
184 void show_trace(unsigned long *stack)
186 const unsigned cpu = safe_smp_processor_id();
187 unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
191 printk("\nCall Trace:");
193 #define HANDLE_STACK(cond) \
195 unsigned long addr = *stack++; \
196 if (kernel_text_address(addr)) { \
204 * If the address is either in the text segment of the \
205 * kernel, or in the region which contains vmalloc'ed \
206 * memory, it *may* be the address of a calling \
207 * routine; if so, print it so that someone tracing \
208 * down the cause of the crash will be able to figure \
209 * out the call path that was taken. \
211 i += printk_address(addr); \
217 unsigned long *estack_end;
218 estack_end = in_exception_stack(cpu, (unsigned long)stack,
222 i += printk(" <%s>", id);
223 HANDLE_STACK (stack < estack_end);
224 i += printk(" <EOE>");
225 stack = (unsigned long *) estack_end[-2];
229 unsigned long *irqstack;
230 irqstack = irqstack_end -
231 (IRQSTACKSIZE - 64) / sizeof(*irqstack);
233 if (stack >= irqstack && stack < irqstack_end) {
234 i += printk(" <IRQ>");
235 HANDLE_STACK (stack < irqstack_end);
236 stack = (unsigned long *) (irqstack_end[-1]);
238 i += printk(" <EOI>");
245 HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
250 void show_stack(struct task_struct *tsk, unsigned long * rsp)
252 unsigned long *stack;
254 const int cpu = safe_smp_processor_id();
255 unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr);
256 unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
258 // debugging aid: "show_stack(NULL, NULL);" prints the
259 // back trace for this cpu.
263 rsp = (unsigned long *)tsk->thread.rsp;
265 rsp = (unsigned long *)&rsp;
269 for(i=0; i < kstack_depth_to_print; i++) {
270 if (stack >= irqstack && stack <= irqstack_end) {
271 if (stack == irqstack_end) {
272 stack = (unsigned long *) (irqstack_end[-1]);
276 if (((long) stack & (THREAD_SIZE-1)) == 0)
279 if (i && ((i % 4) == 0))
281 printk("%016lx ", *stack++);
282 touch_nmi_watchdog();
284 show_trace((unsigned long *)rsp);
288 * The architecture-independent dump_stack generator
290 void dump_stack(void)
296 EXPORT_SYMBOL(dump_stack);
298 void show_registers(struct pt_regs *regs)
301 int in_kernel = !user_mode(regs);
303 const int cpu = safe_smp_processor_id();
304 struct task_struct *cur = cpu_pda(cpu)->pcurrent;
308 printk("CPU %d ", cpu);
310 printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
311 cur->comm, cur->pid, cur->thread_info, cur);
314 * When in-kernel, we also print out the stack and code at the
315 * time of the fault..
320 show_stack(NULL, (unsigned long*)rsp);
323 if(regs->rip < PAGE_OFFSET)
329 if(__get_user(c, &((unsigned char*)regs->rip)[i])) {
331 printk(" Bad RIP value.");
340 void handle_BUG(struct pt_regs *regs)
347 if (__copy_from_user(&f, (const void __user *) regs->rip,
348 sizeof(struct bug_frame)))
350 if (f.filename >= 0 ||
351 f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
353 if (__get_user(tmp, (char *)(long)f.filename))
354 f.filename = (int)(long)"unmapped filename";
355 printk("----------- [cut here ] --------- [please bite here ] ---------\n");
356 printk(KERN_ALERT "Kernel BUG at %.50s:%d\n", (char *)(long)f.filename, f.line);
360 void out_of_line_bug(void)
366 static DEFINE_SPINLOCK(die_lock);
367 static int die_owner = -1;
369 unsigned long oops_begin(void)
371 int cpu = safe_smp_processor_id();
374 /* racy, but better than risking deadlock. */
375 local_irq_save(flags);
376 if (!spin_trylock(&die_lock)) {
377 if (cpu == die_owner)
378 /* nested oops. should stop eventually */;
380 spin_lock(&die_lock);
388 void oops_end(unsigned long flags)
392 spin_unlock_irqrestore(&die_lock, flags);
397 void __die(const char * str, struct pt_regs * regs, long err)
399 static int die_counter;
400 printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
401 #ifdef CONFIG_PREEMPT
407 #ifdef CONFIG_DEBUG_PAGEALLOC
408 printk("DEBUG_PAGEALLOC");
411 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
412 show_registers(regs);
413 /* Executive summary in case the oops scrolled away */
414 printk(KERN_ALERT "RIP ");
415 printk_address(regs->rip);
416 printk(" RSP <%016lx>\n", regs->rsp);
419 void die(const char * str, struct pt_regs * regs, long err)
421 unsigned long flags = oops_begin();
424 __die(str, regs, err);
429 void die_nmi(char *str, struct pt_regs *regs)
431 unsigned long flags = oops_begin();
434 * We are in trouble anyway, lets at least try
435 * to get a message out.
437 printk(str, safe_smp_processor_id());
438 show_registers(regs);
439 if (panic_on_timeout || panic_on_oops)
440 panic("nmi watchdog");
441 printk("console shuts up ...\n");
446 static void __kprobes do_trap(int trapnr, int signr, char *str,
447 struct pt_regs * regs, long error_code,
450 struct task_struct *tsk = current;
452 conditional_sti(regs);
454 tsk->thread.error_code = error_code;
455 tsk->thread.trap_no = trapnr;
457 if (user_mode(regs)) {
458 if (exception_trace && unhandled_signal(tsk, signr))
460 "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
461 tsk->comm, tsk->pid, str,
462 regs->rip,regs->rsp,error_code);
465 force_sig_info(signr, info, tsk);
467 force_sig(signr, tsk);
474 const struct exception_table_entry *fixup;
475 fixup = search_exception_tables(regs->rip);
477 regs->rip = fixup->fixup;
479 die(str, regs, error_code);
484 #define DO_ERROR(trapnr, signr, str, name) \
485 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
487 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
490 do_trap(trapnr, signr, str, regs, error_code, NULL); \
493 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
494 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
497 info.si_signo = signr; \
499 info.si_code = sicode; \
500 info.si_addr = (void __user *)siaddr; \
501 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
504 do_trap(trapnr, signr, str, regs, error_code, &info); \
507 DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
508 DO_ERROR( 4, SIGSEGV, "overflow", overflow)
509 DO_ERROR( 5, SIGSEGV, "bounds", bounds)
510 DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip)
511 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
512 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
513 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
514 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
515 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
516 DO_ERROR(18, SIGSEGV, "reserved", reserved)
517 DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
519 asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
521 static const char str[] = "double fault";
522 struct task_struct *tsk = current;
524 /* Return not checked because double check cannot be ignored */
525 notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
527 tsk->thread.error_code = error_code;
528 tsk->thread.trap_no = 8;
530 /* This is always a kernel trap and never fixable (and thus must
533 die(str, regs, error_code);
536 asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
539 struct task_struct *tsk = current;
541 conditional_sti(regs);
543 tsk->thread.error_code = error_code;
544 tsk->thread.trap_no = 13;
546 if (user_mode(regs)) {
547 if (exception_trace && unhandled_signal(tsk, SIGSEGV))
549 "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
551 regs->rip,regs->rsp,error_code);
553 force_sig(SIGSEGV, tsk);
559 const struct exception_table_entry *fixup;
560 fixup = search_exception_tables(regs->rip);
562 regs->rip = fixup->fixup;
565 if (notify_die(DIE_GPF, "general protection fault", regs,
566 error_code, 13, SIGSEGV) == NOTIFY_STOP)
568 die("general protection fault", regs, error_code);
572 static void mem_parity_error(unsigned char reason, struct pt_regs * regs)
574 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
575 printk("You probably have a hardware problem with your RAM chips\n");
577 /* Clear and disable the memory parity error line. */
578 reason = (reason & 0xf) | 4;
582 static void io_check_error(unsigned char reason, struct pt_regs * regs)
584 printk("NMI: IOCK error (debug interrupt?)\n");
585 show_registers(regs);
587 /* Re-enable the IOCK line, wait for a few seconds */
588 reason = (reason & 0xf) | 8;
595 static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
596 { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
597 printk("Dazed and confused, but trying to continue\n");
598 printk("Do you have a strange power saving mode enabled?\n");
601 /* Runs on IST stack. This code must keep interrupts off all the time.
602 Nested NMIs are prevented by the CPU. */
603 asmlinkage void default_do_nmi(struct pt_regs *regs)
605 unsigned char reason = 0;
608 cpu = smp_processor_id();
610 /* Only the BSP gets external NMIs from the system. */
612 reason = get_nmi_reason();
614 if (!(reason & 0xc0)) {
615 if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
618 #ifdef CONFIG_X86_LOCAL_APIC
620 * Ok, so this is none of the documented NMI sources,
621 * so it must be the NMI watchdog.
623 if (nmi_watchdog > 0) {
624 nmi_watchdog_tick(regs,reason);
628 unknown_nmi_error(reason, regs);
631 if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
634 /* AK: following checks seem to be broken on modern chipsets. FIXME */
637 mem_parity_error(reason, regs);
639 io_check_error(reason, regs);
642 /* runs on IST stack. */
643 asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
645 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
648 do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
652 /* Help handler running on IST stack to switch back to user stack
653 for scheduling or signal handling. The actual stack switch is done in
655 asmlinkage struct pt_regs *sync_regs(struct pt_regs *eregs)
657 struct pt_regs *regs = eregs;
658 /* Did already sync */
659 if (eregs == (struct pt_regs *)eregs->rsp)
661 /* Exception from user space */
662 else if (user_mode(eregs))
663 regs = ((struct pt_regs *)current->thread.rsp0) - 1;
664 /* Exception from kernel and interrupts are enabled. Move to
665 kernel process stack. */
666 else if (eregs->eflags & X86_EFLAGS_IF)
667 regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs));
673 /* runs on IST stack. */
674 asmlinkage void __kprobes do_debug(struct pt_regs * regs,
675 unsigned long error_code)
677 unsigned long condition;
678 struct task_struct *tsk = current;
681 get_debugreg(condition, 6);
683 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
684 SIGTRAP) == NOTIFY_STOP)
687 conditional_sti(regs);
689 /* Mask out spurious debug traps due to lazy DR7 setting */
690 if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
691 if (!tsk->thread.debugreg7) {
696 tsk->thread.debugreg6 = condition;
698 /* Mask out spurious TF errors due to lazy TF clearing */
699 if (condition & DR_STEP) {
701 * The TF error should be masked out only if the current
702 * process is not traced and if the TRAP flag has been set
703 * previously by a tracing process (condition detected by
704 * the PT_DTRACE flag); remember that the i386 TRAP flag
705 * can be modified by the process itself in user mode,
706 * allowing programs to debug themselves without the ptrace()
709 if (!user_mode(regs))
710 goto clear_TF_reenable;
712 * Was the TF flag set by a debugger? If so, clear it now,
713 * so that register information is correct.
715 if (tsk->ptrace & PT_DTRACE) {
716 regs->eflags &= ~TF_MASK;
717 tsk->ptrace &= ~PT_DTRACE;
721 /* Ok, finally something we can handle */
722 tsk->thread.trap_no = 1;
723 tsk->thread.error_code = error_code;
724 info.si_signo = SIGTRAP;
726 info.si_code = TRAP_BRKPT;
727 info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL;
728 force_sig_info(SIGTRAP, &info, tsk);
731 set_debugreg(0UL, 7);
735 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
736 regs->eflags &= ~TF_MASK;
739 static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
741 const struct exception_table_entry *fixup;
742 fixup = search_exception_tables(regs->rip);
744 regs->rip = fixup->fixup;
747 notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
748 /* Illegal floating point operation in the kernel */
749 current->thread.trap_no = trapnr;
755 * Note that we play around with the 'TS' bit in an attempt to get
756 * the correct behaviour even in the presence of the asynchronous
759 asmlinkage void do_coprocessor_error(struct pt_regs *regs)
761 void __user *rip = (void __user *)(regs->rip);
762 struct task_struct * task;
764 unsigned short cwd, swd;
766 conditional_sti(regs);
767 if (!user_mode(regs) &&
768 kernel_math_error(regs, "kernel x87 math error", 16))
772 * Save the info for the exception handler and clear the error.
776 task->thread.trap_no = 16;
777 task->thread.error_code = 0;
778 info.si_signo = SIGFPE;
780 info.si_code = __SI_FAULT;
783 * (~cwd & swd) will mask out exceptions that are not set to unmasked
784 * status. 0x3f is the exception bits in these regs, 0x200 is the
785 * C1 reg you need in case of a stack fault, 0x040 is the stack
786 * fault bit. We should only be taking one exception at a time,
787 * so if this combination doesn't produce any single exception,
788 * then we have a bad program that isn't synchronizing its FPU usage
789 * and it will suffer the consequences since we won't be able to
790 * fully reproduce the context of the exception
792 cwd = get_fpu_cwd(task);
793 swd = get_fpu_swd(task);
794 switch (swd & ~cwd & 0x3f) {
798 case 0x001: /* Invalid Op */
800 * swd & 0x240 == 0x040: Stack Underflow
801 * swd & 0x240 == 0x240: Stack Overflow
802 * User must clear the SF bit (0x40) if set
804 info.si_code = FPE_FLTINV;
806 case 0x002: /* Denormalize */
807 case 0x010: /* Underflow */
808 info.si_code = FPE_FLTUND;
810 case 0x004: /* Zero Divide */
811 info.si_code = FPE_FLTDIV;
813 case 0x008: /* Overflow */
814 info.si_code = FPE_FLTOVF;
816 case 0x020: /* Precision */
817 info.si_code = FPE_FLTRES;
820 force_sig_info(SIGFPE, &info, task);
823 asmlinkage void bad_intr(void)
825 printk("bad interrupt");
828 asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
830 void __user *rip = (void __user *)(regs->rip);
831 struct task_struct * task;
833 unsigned short mxcsr;
835 conditional_sti(regs);
836 if (!user_mode(regs) &&
837 kernel_math_error(regs, "kernel simd math error", 19))
841 * Save the info for the exception handler and clear the error.
845 task->thread.trap_no = 19;
846 task->thread.error_code = 0;
847 info.si_signo = SIGFPE;
849 info.si_code = __SI_FAULT;
852 * The SIMD FPU exceptions are handled a little differently, as there
853 * is only a single status/control register. Thus, to determine which
854 * unmasked exception was caught we must mask the exception mask bits
855 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
857 mxcsr = get_fpu_mxcsr(task);
858 switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
862 case 0x001: /* Invalid Op */
863 info.si_code = FPE_FLTINV;
865 case 0x002: /* Denormalize */
866 case 0x010: /* Underflow */
867 info.si_code = FPE_FLTUND;
869 case 0x004: /* Zero Divide */
870 info.si_code = FPE_FLTDIV;
872 case 0x008: /* Overflow */
873 info.si_code = FPE_FLTOVF;
875 case 0x020: /* Precision */
876 info.si_code = FPE_FLTRES;
879 force_sig_info(SIGFPE, &info, task);
882 asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
886 asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
890 asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
895 * 'math_state_restore()' saves the current math information in the
896 * old math state array, and gets the new ones from the current task
898 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
899 * Don't touch unless you *really* know how it works.
901 asmlinkage void math_state_restore(void)
903 struct task_struct *me = current;
904 clts(); /* Allow maths ops (or we recurse) */
908 restore_fpu_checking(&me->thread.i387.fxsave);
909 me->thread_info->status |= TS_USEDFPU;
912 void __init trap_init(void)
914 set_intr_gate(0,÷_error);
915 set_intr_gate_ist(1,&debug,DEBUG_STACK);
916 set_intr_gate_ist(2,&nmi,NMI_STACK);
917 set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */
918 set_system_gate(4,&overflow); /* int4 can be called from all */
919 set_intr_gate(5,&bounds);
920 set_intr_gate(6,&invalid_op);
921 set_intr_gate(7,&device_not_available);
922 set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
923 set_intr_gate(9,&coprocessor_segment_overrun);
924 set_intr_gate(10,&invalid_TSS);
925 set_intr_gate(11,&segment_not_present);
926 set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK);
927 set_intr_gate(13,&general_protection);
928 set_intr_gate(14,&page_fault);
929 set_intr_gate(15,&spurious_interrupt_bug);
930 set_intr_gate(16,&coprocessor_error);
931 set_intr_gate(17,&alignment_check);
932 #ifdef CONFIG_X86_MCE
933 set_intr_gate_ist(18,&machine_check, MCE_STACK);
935 set_intr_gate(19,&simd_coprocessor_error);
937 #ifdef CONFIG_IA32_EMULATION
938 set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
942 * Should be a barrier for any external CPU state.
948 /* Actual parsing is done early in setup.c. */
949 static int __init oops_dummy(char *s)
954 __setup("oops=", oops_dummy);
956 static int __init kstack_setup(char *s)
958 kstack_depth_to_print = simple_strtoul(s,NULL,0);
961 __setup("kstack=", kstack_setup);