blob: 16c04186194011a0806251d6c8b1ff2227411a8c [file] [log] [blame]
/*
* linux/arch/x86-64/traps.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
*
* Pentium III FXSR, SSE support
* Gareth Hughes <gareth@valinux.com>, May 2000
*
* $Id: traps.c,v 1.71 2004/02/27 22:07:36 ak Exp $
*/
/*
* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'entry.S'.
*/
#include <linux/config.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/debugreg.h>
#include <asm/desc.h>
#include <asm/i387.h>
#include <asm/kdebug.h>
#include <asm/smp.h>
#include <asm/pgalloc.h>
#include <asm/pda.h>
#include <asm/proto.h>
#include <linux/irq.h>
extern int exception_trace;
extern struct gate_struct idt_table[256];
asmlinkage void divide_error(void);
asmlinkage void debug(void);
asmlinkage void nmi(void);
asmlinkage void int3(void);
asmlinkage void overflow(void);
asmlinkage void bounds(void);
asmlinkage void invalid_op(void);
asmlinkage void device_not_available(void);
asmlinkage void double_fault(void);
asmlinkage void coprocessor_segment_overrun(void);
asmlinkage void invalid_TSS(void);
asmlinkage void segment_not_present(void);
asmlinkage void stack_segment(void);
asmlinkage void general_protection(void);
asmlinkage void page_fault(void);
asmlinkage void coprocessor_error(void);
asmlinkage void simd_coprocessor_error(void);
asmlinkage void reserved(void);
asmlinkage void alignment_check(void);
asmlinkage void machine_check(void);
asmlinkage void spurious_interrupt_bug(void);
asmlinkage void call_debug(void);
static inline void conditional_sti(struct pt_regs *regs)
{
if (regs->eflags & X86_EFLAGS_IF)
__sti();
}
extern char iret_address[];
struct notifier_block *die_chain;
int kstack_depth_to_print = 12;
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
int printk_address(unsigned long address)
{
unsigned long dummy;
const char *modname, *secname, *symname;
unsigned long symstart;
char *delim = ":";
/* What a function call! */
if (!kallsyms_address_to_symbol(address,
&modname, &dummy, &dummy,
&secname, &dummy, &dummy,
&symname, &symstart, &dummy)) {
return printk("[<%016lx>]", address);
}
if (!strcmp(modname, "kernel"))
modname = delim = "";
return printk("[<%016lx>]{%s%s%s%s%+ld}",
address,delim,modname,delim,symname,address-symstart);
}
#else
int printk_address(unsigned long address)
{
return printk("[<%016lx>]", address);
}
#endif
#ifdef CONFIG_MODULES
extern struct module *module_list;
extern struct module kernel_module;
static inline int kernel_text_address(unsigned long addr)
{
int retval = 0;
struct module *mod;
if (addr >= (unsigned long) &_stext &&
addr <= (unsigned long) &_etext)
return 1;
for (mod = module_list; mod != &kernel_module; mod = mod->next) {
/* mod_bound tests for addr being inside the vmalloc'ed
* module area. Of course it'd be better to test only
* for the .text subset... */
if (mod_bound(addr, 0, mod)) {
retval = 1;
break;
}
}
return retval;
}
#else
static inline int kernel_text_address(unsigned long addr)
{
return (addr >= (unsigned long) &_stext &&
addr <= (unsigned long) &_etext);
}
#endif
unsigned long *in_exception_stack(int cpu, unsigned long stack)
{
int k;
for (k = 0; k < N_EXCEPTION_STACKS; k++) {
unsigned long end = init_tss[cpu].ist[k] + EXCEPTION_STKSZ;
if (stack >= init_tss[cpu].ist[k] && stack <= end)
return (unsigned long *)end;
}
return 0;
}
void show_trace(unsigned long *stack)
{
unsigned long addr;
unsigned long *irqstack, *irqstack_end, *estack_end;
const int cpu = safe_smp_processor_id();
int i;
printk("\nCall Trace: ");
i = 12;
estack_end = in_exception_stack(cpu, (unsigned long)stack);
if (estack_end) {
while (stack < estack_end) {
addr = *stack++;
if (kernel_text_address(addr)) {
i += printk_address(addr);
i += printk(" ");
if (i > 50) {
printk("\n ");
i = 0;
}
}
}
printk(" <EOE> ");
i += 7;
stack = (unsigned long *) estack_end[-2];
}
irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE + 8);
if (stack >= irqstack && stack < irqstack_end) {
while (stack < irqstack_end) {
addr = *stack++;
/*
* If the address is either in the text segment of the
* kernel, or in the region which contains vmalloc'ed
* memory, it *may* be the address of a calling
* routine; if so, print it so that someone tracing
* down the cause of the crash will be able to figure
* out the call path that was taken.
*/
if (kernel_text_address(addr)) {
i += printk_address(addr);
i += printk(" ");
if (i > 50) {
printk("\n ");
i = 0;
}
}
}
stack = (unsigned long *) (irqstack_end[-1]);
i += 7;
printk(" <EOI> ");
}
while (((long) stack & (THREAD_SIZE-1)) != 0) {
addr = *stack++;
if (kernel_text_address(addr)) {
i += printk_address(addr);
i += printk(" ");
if (i > 50) {
printk("\n ");
i = 0;
}
}
}
printk("\n");
}
void show_trace_task(struct task_struct *tsk)
{
unsigned long rsp = tsk->thread.rsp;
/* User space on another CPU? */
if ((rsp ^ (unsigned long)tsk) & (PAGE_MASK<<1))
return;
show_trace((unsigned long *)rsp);
}
void show_stack(unsigned long * rsp)
{
unsigned long *stack;
int i;
const int cpu = safe_smp_processor_id();
unsigned long *irqstack_end = (unsigned long *) (cpu_pda[cpu].irqstackptr);
unsigned long *irqstack = (unsigned long *) (cpu_pda[cpu].irqstackptr - IRQSTACKSIZE);
// debugging aid: "show_stack(NULL);" prints the
// back trace for this cpu.
if(rsp==NULL)
rsp=(unsigned long*)&rsp;
stack = rsp;
for(i=0; i < kstack_depth_to_print; i++) {
if (stack >= irqstack && stack <= irqstack_end) {
if (stack == irqstack_end) {
stack = (unsigned long *) (irqstack_end[-1]);
printk(" <EOI> ");
}
} else {
if (((long) stack & (THREAD_SIZE-1)) == 0)
break;
}
if (i && ((i % 4) == 0))
printk("\n ");
printk("%016lx ", *stack++);
}
show_trace((unsigned long *)rsp);
}
void show_registers(struct pt_regs *regs)
{
int i;
int in_kernel = 1;
unsigned long rsp;
const int cpu = safe_smp_processor_id();
struct task_struct *cur = cpu_pda[cpu].pcurrent;
rsp = (unsigned long) (&regs->rsp);
if (regs->rsp < TASK_SIZE) {
in_kernel = 0;
rsp = regs->rsp;
}
printk("CPU %d ", cpu);
__show_regs(regs);
printk("Process %s (pid: %d, stackpage=%08lx)\n",
cur->comm, cur->pid, 4096+(unsigned long)cur);
/*
* When in-kernel, we also print out the stack and code at the
* time of the fault..
*/
if (in_kernel) {
printk("Stack: ");
show_stack((unsigned long*)rsp);
printk("\nCode: ");
if(regs->rip < PAGE_OFFSET)
goto bad;
for(i=0;i<20;i++)
{
unsigned char c;
if(__get_user(c, &((unsigned char*)regs->rip)[i])) {
bad:
printk(" Bad RIP value.");
break;
}
printk("%02x ", c);
}
}
printk("\n");
}
void handle_BUG(struct pt_regs *regs)
{
struct bug_frame f;
char tmp;
if (regs->cs & 3)
return;
if (__copy_from_user(&f, (struct bug_frame *) regs->rip,
sizeof(struct bug_frame)))
return;
if ((unsigned long)f.filename < __PAGE_OFFSET ||
f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
return;
if (__get_user(tmp, f.filename))
f.filename = "unmapped filename";
printk(KERN_EMERG "Kernel BUG at %.50s:%d\n", f.filename, f.line);
}
spinlock_t die_lock = SPIN_LOCK_UNLOCKED;
int die_owner = -1;
void __die(const char * str, struct pt_regs * regs, long err)
{
printk(KERN_EMERG "%s: %04lx\n", str, err & 0xffff);
notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
show_registers(regs);
/* Execute summary in case the oops scrolled away */
printk(KERN_EMERG "RIP ");
printk_address(regs->rip);
printk(" RSP <%016lx>\n", regs->rsp);
}
void prepare_die(unsigned long *flags)
{
int cpu;
console_verbose();
bust_spinlocks(1);
cpu = safe_smp_processor_id();
/* racy, but better than risking deadlock. */
__save_flags(*flags);
__cli();
if (!spin_trylock(&die_lock)) {
if (cpu == die_owner)
/* nested oops. should stop eventually */;
else
spin_lock(&die_lock);
}
die_owner = cpu;
}
void exit_die(unsigned long flags)
{
die_owner = -1;
spin_unlock_irqrestore(&die_lock, flags);
__sti(); /* back scroll should work */
bust_spinlocks(0);
}
void die(const char * str, struct pt_regs * regs, long err)
{
unsigned long flags;
prepare_die(&flags);
handle_BUG(regs);
__die(str, regs, err);
exit_die(flags);
do_exit(SIGSEGV);
}
static inline void die_if_kernel(const char * str, struct pt_regs * regs, long err)
{
if (regs->cs == __KERNEL_CS)
die(str, regs, err);
}
static inline unsigned long get_cr2(void)
{
unsigned long address;
/* get the address */
__asm__("movq %%cr2,%0":"=r" (address));
return address;
}
static void do_trap(int trapnr, int signr, char *str,
struct pt_regs * regs, long error_code, siginfo_t *info)
{
conditional_sti(regs);
#if defined(CONFIG_CHECKING) && defined(CONFIG_LOCAL_APIC)
{
unsigned long gs;
struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
rdmsrl(MSR_GS_BASE, gs);
if (gs != (unsigned long)pda) {
wrmsrl(MSR_GS_BASE, pda);
printk("%s: wrong gs %lx expected %p\n", str, gs, pda);
}
}
#endif
if ((regs->cs & 3) != 0) {
struct task_struct *tsk = current;
tsk->thread.error_code = error_code;
tsk->thread.trap_no = trapnr;
if (exception_trace && !(tsk->ptrace & PT_PTRACED) &&
(tsk->sig->action[signr-1].sa.sa_handler == SIG_IGN ||
(tsk->sig->action[signr-1].sa.sa_handler == SIG_DFL)))
printk(KERN_INFO
"%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
tsk->comm, tsk->pid, str,
regs->rip,regs->rsp,error_code);
if (info)
force_sig_info(signr, info, tsk);
else
force_sig(signr, tsk);
return;
}
/* kernel trap */
{
unsigned long fixup = search_exception_table(regs->rip);
if (fixup) {
regs->rip = fixup;
} else
die(str, regs, error_code);
return;
}
}
#define DO_ERROR(trapnr, signr, str, name) \
asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
{ \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) == NOTIFY_BAD) \
return; \
do_trap(trapnr, signr, str, regs, error_code, NULL); \
}
#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
{ \
siginfo_t info; \
info.si_signo = signr; \
info.si_errno = 0; \
info.si_code = sicode; \
info.si_addr = (void *)siaddr; \
if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr)==NOTIFY_BAD) \
return; \
do_trap(trapnr, signr, str, regs, error_code, &info); \
}
DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
DO_ERROR( 3, SIGTRAP, "int3", int3);
DO_ERROR( 4, SIGSEGV, "overflow", overflow)
DO_ERROR( 5, SIGSEGV, "bounds", bounds)
DO_ERROR_INFO( 6, SIGILL, "invalid operand", invalid_op, ILL_ILLOPN, regs->rip)
DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
DO_ERROR( 8, SIGSEGV, "double fault", double_fault)
DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, get_cr2())
DO_ERROR(18, SIGSEGV, "reserved", reserved)
extern void dump_pagetable(unsigned long);
asmlinkage void do_general_protection(struct pt_regs * regs, long error_code)
{
conditional_sti(regs);
#ifdef CONFIG_CHECKING
{
unsigned long gs;
struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
rdmsrl(MSR_GS_BASE, gs);
if (gs != (unsigned long)pda) {
wrmsrl(MSR_GS_BASE, pda);
/* Avoid wakeup in printk in case this was triggered
by the segment reloads in __switch_to. Otherwise
the wake_up could deadlock on scheduler locks. */
oops_in_progress++;
printk(KERN_EMERG
"general protection handler: wrong gs %lx expected %p\n", gs, pda);
oops_in_progress--;
}
}
#endif
if (regs->cs & 3) {
struct task_struct *tsk = current;
tsk->thread.error_code = error_code;
tsk->thread.trap_no = 13;
if (exception_trace && !(tsk->ptrace & PT_PTRACED) &&
(tsk->sig->action[SIGSEGV-1].sa.sa_handler == SIG_IGN ||
(tsk->sig->action[SIGSEGV-1].sa.sa_handler == SIG_DFL)))
printk(KERN_INFO
"%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
tsk->comm, tsk->pid,
regs->rip,regs->rsp,error_code);
force_sig(SIGSEGV, tsk);
return;
}
/* kernel gp */
{
unsigned long fixup;
fixup = search_exception_table(regs->rip);
if (fixup) {
regs->rip = fixup;
return;
}
notify_die(DIE_GPF, "general protection fault", regs, error_code,
13, SIGSEGV);
die("general protection fault", regs, error_code);
}
}
static void mem_parity_error(unsigned char reason, struct pt_regs * regs)
{
printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
printk("You probably have a hardware problem with your RAM chips\n");
/* Clear and disable the memory parity error line. */
reason = (reason & 0xf) | 4;
outb(reason, 0x61);
}
static void io_check_error(unsigned char reason, struct pt_regs * regs)
{
printk("NMI: IOCK error (debug interrupt?)\n");
show_registers(regs);
/* Re-enable the IOCK line, wait for a few seconds */
reason = (reason & 0xf) | 8;
outb(reason, 0x61);
mdelay(2000);
reason &= ~8;
outb(reason, 0x61);
}
static void unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
{
printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
printk("Dazed and confused, but trying to continue\n");
printk("Do you have a strange power saving mode enabled?\n");
}
asmlinkage void do_nmi(struct pt_regs * regs)
{
unsigned char reason = inb(0x61);
++nmi_count(safe_smp_processor_id());
if (!(reason & 0xc0)) {
#if CONFIG_X86_LOCAL_APIC
/*
* Ok, so this is none of the documented NMI sources,
* so it must be the NMI watchdog.
*/
if (nmi_watchdog) {
nmi_watchdog_tick(regs, reason);
return;
}
#endif
unknown_nmi_error(reason, regs);
return;
}
if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_BAD)
return;
if (reason & 0x80)
mem_parity_error(reason, regs);
if (reason & 0x40)
io_check_error(reason, regs);
/*
* Reassert NMI in case it became active meanwhile
* as it's edge-triggered.
*/
outb(0x8f, 0x70);
inb(0x71); /* dummy */
outb(0x0f, 0x70);
inb(0x71); /* dummy */
}
asmlinkage void do_debug(struct pt_regs * regs, long error_code)
{
unsigned long condition;
struct task_struct *tsk = current;
siginfo_t info;
asm("movq %%db6,%0" : "=r" (condition));
conditional_sti(regs);
#ifdef CONFIG_CHECKING
{
/* XXX: interaction with debugger - could destroy gs */
unsigned long gs;
struct x8664_pda *pda = cpu_pda + safe_smp_processor_id();
rdmsrl(MSR_GS_BASE, gs);
if (gs != (unsigned long)pda) {
wrmsrl(MSR_GS_BASE, pda);
printk(KERN_EMERG "debug handler: wrong gs %lx expected %p\n", gs, pda);
}
}
#endif
/* Mask out spurious debug traps due to lazy DR7 setting */
if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
if (!tsk->thread.debugreg[7]) {
goto clear_dr7;
}
}
tsk->thread.debugreg[6] = condition;
/* Mask out spurious TF errors due to lazy TF clearing */
if (condition & DR_STEP) {
/*
* The TF error should be masked out only if the current
* process is not traced and if the TRAP flag has been set
* previously by a tracing process (condition detected by
* the PT_DTRACE flag); remember that the i386 TRAP flag
* can be modified by the process itself in user mode,
* allowing programs to debug themselves without the ptrace()
* interface.
*/
if ((regs->cs & 3) == 0)
goto clear_TF;
if ((tsk->ptrace & (PT_DTRACE|PT_PTRACED)) == PT_DTRACE)
goto clear_TF;
}
/* Ok, finally something we can handle */
tsk->thread.trap_no = 1;
tsk->thread.error_code = error_code;
info.si_signo = SIGTRAP;
info.si_errno = 0;
info.si_code = TRAP_BRKPT;
if ((regs->cs & 3) == 0)
goto clear_dr7;
info.si_addr = (void *)regs->rip;
force_sig_info(SIGTRAP, &info, tsk);
clear_dr7:
asm volatile("movq %0,%%db7"::"r"(0UL));
notify_die(DIE_DEBUG, "debug", regs, error_code, 1, SIGTRAP);
return;
clear_TF:
/* XXX: could cause spurious errors */
if (notify_die(DIE_DEBUG, "debug2", regs, error_code, 1, SIGTRAP) != NOTIFY_BAD)
regs->eflags &= ~TF_MASK;
return;
}
/*
* Note that we play around with the 'TS' bit in an attempt to get
* the correct behaviour even in the presence of the asynchronous
* IRQ13 behaviour
*/
void math_error(void *rip)
{
struct task_struct * task;
siginfo_t info;
unsigned short cwd, swd;
/*
* Save the info for the exception handler and clear the error.
*/
task = current;
save_init_fpu(task);
task->thread.trap_no = 16;
task->thread.error_code = 0;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_code = __SI_FAULT;
info.si_addr = rip;
/*
* (~cwd & swd) will mask out exceptions that are not set to unmasked
* status. 0x3f is the exception bits in these regs, 0x200 is the
* C1 reg you need in case of a stack fault, 0x040 is the stack
* fault bit. We should only be taking one exception at a time,
* so if this combination doesn't produce any single exception,
* then we have a bad program that isn't syncronizing its FPU usage
* and it will suffer the consequences since we won't be able to
* fully reproduce the context of the exception
*/
cwd = get_fpu_cwd(task);
swd = get_fpu_swd(task);
switch (((~cwd) & swd & 0x3f) | (swd & 0x240)) {
case 0x000:
default:
break;
case 0x001: /* Invalid Op */
case 0x041: /* Stack Fault */
case 0x241: /* Stack Fault | Direction */
info.si_code = FPE_FLTINV;
break;
case 0x002: /* Denormalize */
case 0x010: /* Underflow */
info.si_code = FPE_FLTUND;
break;
case 0x004: /* Zero Divide */
info.si_code = FPE_FLTDIV;
break;
case 0x008: /* Overflow */
info.si_code = FPE_FLTOVF;
break;
case 0x020: /* Precision */
info.si_code = FPE_FLTRES;
break;
}
force_sig_info(SIGFPE, &info, task);
}
asmlinkage void do_coprocessor_error(struct pt_regs * regs, long error_code)
{
conditional_sti(regs);
math_error((void *)regs->rip);
}
asmlinkage void bad_intr(void)
{
printk("bad interrupt");
}
static inline void simd_math_error(void *rip)
{
struct task_struct * task;
siginfo_t info;
unsigned short mxcsr;
/*
* Save the info for the exception handler and clear the error.
*/
task = current;
save_init_fpu(task);
task->thread.trap_no = 19;
task->thread.error_code = 0;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_code = __SI_FAULT;
info.si_addr = rip;
/*
* The SIMD FPU exceptions are handled a little differently, as there
* is only a single status/control register. Thus, to determine which
* unmasked exception was caught we must mask the exception mask bits
* at 0x1f80, and then use these to mask the exception bits at 0x3f.
*/
mxcsr = get_fpu_mxcsr(task);
switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
case 0x000:
default:
break;
case 0x001: /* Invalid Op */
info.si_code = FPE_FLTINV;
break;
case 0x002: /* Denormalize */
case 0x010: /* Underflow */
info.si_code = FPE_FLTUND;
break;
case 0x004: /* Zero Divide */
info.si_code = FPE_FLTDIV;
break;
case 0x008: /* Overflow */
info.si_code = FPE_FLTOVF;
break;
case 0x020: /* Precision */
info.si_code = FPE_FLTRES;
break;
}
force_sig_info(SIGFPE, &info, task);
}
asmlinkage void do_simd_coprocessor_error(struct pt_regs * regs,
long error_code)
{
conditional_sti(regs);
simd_math_error((void *)regs->rip);
}
asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
{
}
/*
* 'math_state_restore()' saves the current math information in the
* old math state array, and gets the new ones from the current task
*
* Careful.. There are problems with IBM-designed IRQ13 behaviour.
* Don't touch unless you *really* know how it works.
*/
asmlinkage void math_state_restore(void)
{
struct task_struct *me = current;
clts(); /* Allow maths ops (or we recurse) */
if (!me->used_math)
init_fpu(me);
restore_fpu_checking(&me->thread.i387.fxsave);
me->flags |= PF_USEDFPU; /* So we fxsave on switch_to() */
}
asmlinkage void math_emulate(void)
{
BUG();
}
void do_call_debug(struct pt_regs *regs)
{
notify_die(DIE_CALL, "debug call", regs, 0, 255, SIGINT);
}
#ifndef CONFIG_MCE
void do_machine_check(struct pt_regs *regs)
{
printk(KERN_INFO "Machine check ignored\n");
}
#endif
void __init trap_init(void)
{
set_intr_gate(0,&divide_error);
set_intr_gate(1,&debug);
set_intr_gate_ist(2,&nmi,NMI_STACK);
set_system_gate(3,&int3); /* int3-5 can be called from all */
set_system_gate(4,&overflow);
set_system_gate(5,&bounds);
set_intr_gate(6,&invalid_op);
set_intr_gate(7,&device_not_available);
set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
set_intr_gate(9,&coprocessor_segment_overrun);
set_intr_gate(10,&invalid_TSS);
set_intr_gate(11,&segment_not_present);
set_intr_gate(12,&stack_segment);
set_intr_gate(13,&general_protection);
set_intr_gate(14,&page_fault);
set_intr_gate(15,&spurious_interrupt_bug);
set_intr_gate(16,&coprocessor_error);
set_intr_gate(17,&alignment_check);
set_intr_gate(18,&machine_check);
set_intr_gate(19,&simd_coprocessor_error);
#ifdef CONFIG_IA32_EMULATION
set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
#endif
/*
* Should be a barrier for any external CPU state.
*/
cpu_init();
}