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 const char ids
[N_EXCEPTION_STACKS
][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",
133 for (k
= 0; k
< N_EXCEPTION_STACKS
; k
++) {
136 end
= per_cpu(init_tss
, cpu
).ist
[k
];
139 if (stack
>= end
- EXCEPTION_STKSZ
) {
140 if (*usedp
& (1U << k
))
144 return (unsigned long *)end
;
151 * x86-64 can have upto three kernel stacks:
154 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
157 void show_trace(unsigned long *stack
)
160 const unsigned cpu
= safe_smp_processor_id();
161 unsigned long *irqstack_end
= (unsigned long *)cpu_pda
[cpu
].irqstackptr
;
165 printk("\nCall Trace:");
167 #define HANDLE_STACK(cond) \
170 if (kernel_text_address(addr)) { \
172 * If the address is either in the text segment of the \
173 * kernel, or in the region which contains vmalloc'ed \
174 * memory, it *may* be the address of a calling \
175 * routine; if so, print it so that someone tracing \
176 * down the cause of the crash will be able to figure \
177 * out the call path that was taken. \
179 i += printk_address(addr); \
191 unsigned long *estack_end
;
192 estack_end
= in_exception_stack(cpu
, (unsigned long)stack
,
196 i
+= printk(" <%s> ", id
);
197 HANDLE_STACK (stack
< estack_end
);
198 i
+= printk(" <EOE> ");
199 stack
= (unsigned long *) estack_end
[-2];
203 unsigned long *irqstack
;
204 irqstack
= irqstack_end
-
205 (IRQSTACKSIZE
- 64) / sizeof(*irqstack
);
207 if (stack
>= irqstack
&& stack
< irqstack_end
) {
208 i
+= printk(" <IRQ> ");
209 HANDLE_STACK (stack
< irqstack_end
);
210 stack
= (unsigned long *) (irqstack_end
[-1]);
212 i
+= printk(" <EOI> ");
219 HANDLE_STACK (((long) stack
& (THREAD_SIZE
-1)) != 0);
224 void show_stack(struct task_struct
*tsk
, unsigned long * rsp
)
226 unsigned long *stack
;
228 const int cpu
= safe_smp_processor_id();
229 unsigned long *irqstack_end
= (unsigned long *) (cpu_pda
[cpu
].irqstackptr
);
230 unsigned long *irqstack
= (unsigned long *) (cpu_pda
[cpu
].irqstackptr
- IRQSTACKSIZE
);
232 // debugging aid: "show_stack(NULL, NULL);" prints the
233 // back trace for this cpu.
237 rsp
= (unsigned long *)tsk
->thread
.rsp
;
239 rsp
= (unsigned long *)&rsp
;
243 for(i
=0; i
< kstack_depth_to_print
; i
++) {
244 if (stack
>= irqstack
&& stack
<= irqstack_end
) {
245 if (stack
== irqstack_end
) {
246 stack
= (unsigned long *) (irqstack_end
[-1]);
250 if (((long) stack
& (THREAD_SIZE
-1)) == 0)
253 if (i
&& ((i
% 4) == 0))
255 printk("%016lx ", *stack
++);
256 touch_nmi_watchdog();
258 show_trace((unsigned long *)rsp
);
262 * The architecture-independent dump_stack generator
264 void dump_stack(void)
270 EXPORT_SYMBOL(dump_stack
);
272 void show_registers(struct pt_regs
*regs
)
275 int in_kernel
= !user_mode(regs
);
277 const int cpu
= safe_smp_processor_id();
278 struct task_struct
*cur
= cpu_pda
[cpu
].pcurrent
;
282 printk("CPU %d ", cpu
);
284 printk("Process %s (pid: %d, threadinfo %p, task %p)\n",
285 cur
->comm
, cur
->pid
, cur
->thread_info
, cur
);
288 * When in-kernel, we also print out the stack and code at the
289 * time of the fault..
294 show_stack(NULL
, (unsigned long*)rsp
);
297 if(regs
->rip
< PAGE_OFFSET
)
303 if(__get_user(c
, &((unsigned char*)regs
->rip
)[i
])) {
305 printk(" Bad RIP value.");
314 void handle_BUG(struct pt_regs
*regs
)
321 if (__copy_from_user(&f
, (struct bug_frame
*) regs
->rip
,
322 sizeof(struct bug_frame
)))
324 if (f
.filename
>= 0 ||
325 f
.ud2
[0] != 0x0f || f
.ud2
[1] != 0x0b)
327 if (__get_user(tmp
, (char *)(long)f
.filename
))
328 f
.filename
= (int)(long)"unmapped filename";
329 printk("----------- [cut here ] --------- [please bite here ] ---------\n");
330 printk(KERN_ALERT
"Kernel BUG at %.50s:%d\n", (char *)(long)f
.filename
, f
.line
);
334 void out_of_line_bug(void)
340 static DEFINE_SPINLOCK(die_lock
);
341 static int die_owner
= -1;
343 unsigned long oops_begin(void)
345 int cpu
= safe_smp_processor_id();
348 /* racy, but better than risking deadlock. */
349 local_irq_save(flags
);
350 if (!spin_trylock(&die_lock
)) {
351 if (cpu
== die_owner
)
352 /* nested oops. should stop eventually */;
354 spin_lock(&die_lock
);
362 void oops_end(unsigned long flags
)
366 spin_unlock_irqrestore(&die_lock
, flags
);
371 void __die(const char * str
, struct pt_regs
* regs
, long err
)
373 static int die_counter
;
374 printk(KERN_EMERG
"%s: %04lx [%u] ", str
, err
& 0xffff,++die_counter
);
375 #ifdef CONFIG_PREEMPT
381 #ifdef CONFIG_DEBUG_PAGEALLOC
382 printk("DEBUG_PAGEALLOC");
385 notify_die(DIE_OOPS
, str
, regs
, err
, current
->thread
.trap_no
, SIGSEGV
);
386 show_registers(regs
);
387 /* Executive summary in case the oops scrolled away */
388 printk(KERN_ALERT
"RIP ");
389 printk_address(regs
->rip
);
390 printk(" RSP <%016lx>\n", regs
->rsp
);
393 void die(const char * str
, struct pt_regs
* regs
, long err
)
395 unsigned long flags
= oops_begin();
398 __die(str
, regs
, err
);
403 void die_nmi(char *str
, struct pt_regs
*regs
)
405 unsigned long flags
= oops_begin();
408 * We are in trouble anyway, lets at least try
409 * to get a message out.
411 printk(str
, safe_smp_processor_id());
412 show_registers(regs
);
413 if (panic_on_timeout
|| panic_on_oops
)
414 panic("nmi watchdog");
415 printk("console shuts up ...\n");
420 static void __kprobes
do_trap(int trapnr
, int signr
, char *str
,
421 struct pt_regs
* regs
, long error_code
,
424 struct task_struct
*tsk
= current
;
426 conditional_sti(regs
);
428 tsk
->thread
.error_code
= error_code
;
429 tsk
->thread
.trap_no
= trapnr
;
431 if (user_mode(regs
)) {
432 if (exception_trace
&& unhandled_signal(tsk
, signr
))
434 "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
435 tsk
->comm
, tsk
->pid
, str
,
436 regs
->rip
,regs
->rsp
,error_code
);
439 force_sig_info(signr
, info
, tsk
);
441 force_sig(signr
, tsk
);
448 const struct exception_table_entry
*fixup
;
449 fixup
= search_exception_tables(regs
->rip
);
451 regs
->rip
= fixup
->fixup
;
453 die(str
, regs
, error_code
);
458 #define DO_ERROR(trapnr, signr, str, name) \
459 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
461 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
464 do_trap(trapnr, signr, str, regs, error_code, NULL); \
467 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
468 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
471 info.si_signo = signr; \
473 info.si_code = sicode; \
474 info.si_addr = (void __user *)siaddr; \
475 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
478 do_trap(trapnr, signr, str, regs, error_code, &info); \
481 DO_ERROR_INFO( 0, SIGFPE
, "divide error", divide_error
, FPE_INTDIV
, regs
->rip
)
482 DO_ERROR( 4, SIGSEGV
, "overflow", overflow
)
483 DO_ERROR( 5, SIGSEGV
, "bounds", bounds
)
484 DO_ERROR_INFO( 6, SIGILL
, "invalid operand", invalid_op
, ILL_ILLOPN
, regs
->rip
)
485 DO_ERROR( 7, SIGSEGV
, "device not available", device_not_available
)
486 DO_ERROR( 9, SIGFPE
, "coprocessor segment overrun", coprocessor_segment_overrun
)
487 DO_ERROR(10, SIGSEGV
, "invalid TSS", invalid_TSS
)
488 DO_ERROR(11, SIGBUS
, "segment not present", segment_not_present
)
489 DO_ERROR_INFO(17, SIGBUS
, "alignment check", alignment_check
, BUS_ADRALN
, 0)
490 DO_ERROR(18, SIGSEGV
, "reserved", reserved
)
491 DO_ERROR(12, SIGBUS
, "stack segment", stack_segment
)
493 asmlinkage
void do_double_fault(struct pt_regs
* regs
, long error_code
)
495 static const char str
[] = "double fault";
496 struct task_struct
*tsk
= current
;
498 /* Return not checked because double check cannot be ignored */
499 notify_die(DIE_TRAP
, str
, regs
, error_code
, 8, SIGSEGV
);
501 tsk
->thread
.error_code
= error_code
;
502 tsk
->thread
.trap_no
= 8;
504 /* This is always a kernel trap and never fixable (and thus must
507 die(str
, regs
, error_code
);
510 asmlinkage
void __kprobes
do_general_protection(struct pt_regs
* regs
,
513 struct task_struct
*tsk
= current
;
515 conditional_sti(regs
);
517 tsk
->thread
.error_code
= error_code
;
518 tsk
->thread
.trap_no
= 13;
520 if (user_mode(regs
)) {
521 if (exception_trace
&& unhandled_signal(tsk
, SIGSEGV
))
523 "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
525 regs
->rip
,regs
->rsp
,error_code
);
527 force_sig(SIGSEGV
, tsk
);
533 const struct exception_table_entry
*fixup
;
534 fixup
= search_exception_tables(regs
->rip
);
536 regs
->rip
= fixup
->fixup
;
539 if (notify_die(DIE_GPF
, "general protection fault", regs
,
540 error_code
, 13, SIGSEGV
) == NOTIFY_STOP
)
542 die("general protection fault", regs
, error_code
);
546 static void mem_parity_error(unsigned char reason
, struct pt_regs
* regs
)
548 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
549 printk("You probably have a hardware problem with your RAM chips\n");
551 /* Clear and disable the memory parity error line. */
552 reason
= (reason
& 0xf) | 4;
556 static void io_check_error(unsigned char reason
, struct pt_regs
* regs
)
558 printk("NMI: IOCK error (debug interrupt?)\n");
559 show_registers(regs
);
561 /* Re-enable the IOCK line, wait for a few seconds */
562 reason
= (reason
& 0xf) | 8;
569 static void unknown_nmi_error(unsigned char reason
, struct pt_regs
* regs
)
570 { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason
);
571 printk("Dazed and confused, but trying to continue\n");
572 printk("Do you have a strange power saving mode enabled?\n");
575 /* Runs on IST stack. This code must keep interrupts off all the time.
576 Nested NMIs are prevented by the CPU. */
577 asmlinkage
void default_do_nmi(struct pt_regs
*regs
)
579 unsigned char reason
= 0;
582 cpu
= smp_processor_id();
584 /* Only the BSP gets external NMIs from the system. */
586 reason
= get_nmi_reason();
588 if (!(reason
& 0xc0)) {
589 if (notify_die(DIE_NMI_IPI
, "nmi_ipi", regs
, reason
, 2, SIGINT
)
592 #ifdef CONFIG_X86_LOCAL_APIC
594 * Ok, so this is none of the documented NMI sources,
595 * so it must be the NMI watchdog.
597 if (nmi_watchdog
> 0) {
598 nmi_watchdog_tick(regs
,reason
);
602 unknown_nmi_error(reason
, regs
);
605 if (notify_die(DIE_NMI
, "nmi", regs
, reason
, 2, SIGINT
) == NOTIFY_STOP
)
608 /* AK: following checks seem to be broken on modern chipsets. FIXME */
611 mem_parity_error(reason
, regs
);
613 io_check_error(reason
, regs
);
616 asmlinkage
void __kprobes
do_int3(struct pt_regs
* regs
, long error_code
)
618 if (notify_die(DIE_INT3
, "int3", regs
, error_code
, 3, SIGTRAP
) == NOTIFY_STOP
) {
621 do_trap(3, SIGTRAP
, "int3", regs
, error_code
, NULL
);
625 /* Help handler running on IST stack to switch back to user stack
626 for scheduling or signal handling. The actual stack switch is done in
628 asmlinkage
struct pt_regs
*sync_regs(struct pt_regs
*eregs
)
630 struct pt_regs
*regs
= eregs
;
631 /* Did already sync */
632 if (eregs
== (struct pt_regs
*)eregs
->rsp
)
634 /* Exception from user space */
635 else if (user_mode(eregs
))
636 regs
= ((struct pt_regs
*)current
->thread
.rsp0
) - 1;
637 /* Exception from kernel and interrupts are enabled. Move to
638 kernel process stack. */
639 else if (eregs
->eflags
& X86_EFLAGS_IF
)
640 regs
= (struct pt_regs
*)(eregs
->rsp
-= sizeof(struct pt_regs
));
646 /* runs on IST stack. */
647 asmlinkage
void __kprobes
do_debug(struct pt_regs
* regs
,
648 unsigned long error_code
)
650 unsigned long condition
;
651 struct task_struct
*tsk
= current
;
654 get_debugreg(condition
, 6);
656 if (notify_die(DIE_DEBUG
, "debug", regs
, condition
, error_code
,
657 SIGTRAP
) == NOTIFY_STOP
)
660 conditional_sti(regs
);
662 /* Mask out spurious debug traps due to lazy DR7 setting */
663 if (condition
& (DR_TRAP0
|DR_TRAP1
|DR_TRAP2
|DR_TRAP3
)) {
664 if (!tsk
->thread
.debugreg7
) {
669 tsk
->thread
.debugreg6
= condition
;
671 /* Mask out spurious TF errors due to lazy TF clearing */
672 if (condition
& DR_STEP
) {
674 * The TF error should be masked out only if the current
675 * process is not traced and if the TRAP flag has been set
676 * previously by a tracing process (condition detected by
677 * the PT_DTRACE flag); remember that the i386 TRAP flag
678 * can be modified by the process itself in user mode,
679 * allowing programs to debug themselves without the ptrace()
682 if (!user_mode(regs
))
683 goto clear_TF_reenable
;
685 * Was the TF flag set by a debugger? If so, clear it now,
686 * so that register information is correct.
688 if (tsk
->ptrace
& PT_DTRACE
) {
689 regs
->eflags
&= ~TF_MASK
;
690 tsk
->ptrace
&= ~PT_DTRACE
;
694 /* Ok, finally something we can handle */
695 tsk
->thread
.trap_no
= 1;
696 tsk
->thread
.error_code
= error_code
;
697 info
.si_signo
= SIGTRAP
;
699 info
.si_code
= TRAP_BRKPT
;
700 if (!user_mode(regs
))
703 info
.si_addr
= (void __user
*)regs
->rip
;
704 force_sig_info(SIGTRAP
, &info
, tsk
);
706 set_debugreg(0UL, 7);
710 set_tsk_thread_flag(tsk
, TIF_SINGLESTEP
);
711 regs
->eflags
&= ~TF_MASK
;
714 static int kernel_math_error(struct pt_regs
*regs
, const char *str
, int trapnr
)
716 const struct exception_table_entry
*fixup
;
717 fixup
= search_exception_tables(regs
->rip
);
719 regs
->rip
= fixup
->fixup
;
722 notify_die(DIE_GPF
, str
, regs
, 0, trapnr
, SIGFPE
);
723 /* Illegal floating point operation in the kernel */
724 current
->thread
.trap_no
= trapnr
;
730 * Note that we play around with the 'TS' bit in an attempt to get
731 * the correct behaviour even in the presence of the asynchronous
734 asmlinkage
void do_coprocessor_error(struct pt_regs
*regs
)
736 void __user
*rip
= (void __user
*)(regs
->rip
);
737 struct task_struct
* task
;
739 unsigned short cwd
, swd
;
741 conditional_sti(regs
);
742 if (!user_mode(regs
) &&
743 kernel_math_error(regs
, "kernel x87 math error", 16))
747 * Save the info for the exception handler and clear the error.
751 task
->thread
.trap_no
= 16;
752 task
->thread
.error_code
= 0;
753 info
.si_signo
= SIGFPE
;
755 info
.si_code
= __SI_FAULT
;
758 * (~cwd & swd) will mask out exceptions that are not set to unmasked
759 * status. 0x3f is the exception bits in these regs, 0x200 is the
760 * C1 reg you need in case of a stack fault, 0x040 is the stack
761 * fault bit. We should only be taking one exception at a time,
762 * so if this combination doesn't produce any single exception,
763 * then we have a bad program that isn't synchronizing its FPU usage
764 * and it will suffer the consequences since we won't be able to
765 * fully reproduce the context of the exception
767 cwd
= get_fpu_cwd(task
);
768 swd
= get_fpu_swd(task
);
769 switch (swd
& ~cwd
& 0x3f) {
773 case 0x001: /* Invalid Op */
775 * swd & 0x240 == 0x040: Stack Underflow
776 * swd & 0x240 == 0x240: Stack Overflow
777 * User must clear the SF bit (0x40) if set
779 info
.si_code
= FPE_FLTINV
;
781 case 0x002: /* Denormalize */
782 case 0x010: /* Underflow */
783 info
.si_code
= FPE_FLTUND
;
785 case 0x004: /* Zero Divide */
786 info
.si_code
= FPE_FLTDIV
;
788 case 0x008: /* Overflow */
789 info
.si_code
= FPE_FLTOVF
;
791 case 0x020: /* Precision */
792 info
.si_code
= FPE_FLTRES
;
795 force_sig_info(SIGFPE
, &info
, task
);
798 asmlinkage
void bad_intr(void)
800 printk("bad interrupt");
803 asmlinkage
void do_simd_coprocessor_error(struct pt_regs
*regs
)
805 void __user
*rip
= (void __user
*)(regs
->rip
);
806 struct task_struct
* task
;
808 unsigned short mxcsr
;
810 conditional_sti(regs
);
811 if (!user_mode(regs
) &&
812 kernel_math_error(regs
, "kernel simd math error", 19))
816 * Save the info for the exception handler and clear the error.
820 task
->thread
.trap_no
= 19;
821 task
->thread
.error_code
= 0;
822 info
.si_signo
= SIGFPE
;
824 info
.si_code
= __SI_FAULT
;
827 * The SIMD FPU exceptions are handled a little differently, as there
828 * is only a single status/control register. Thus, to determine which
829 * unmasked exception was caught we must mask the exception mask bits
830 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
832 mxcsr
= get_fpu_mxcsr(task
);
833 switch (~((mxcsr
& 0x1f80) >> 7) & (mxcsr
& 0x3f)) {
837 case 0x001: /* Invalid Op */
838 info
.si_code
= FPE_FLTINV
;
840 case 0x002: /* Denormalize */
841 case 0x010: /* Underflow */
842 info
.si_code
= FPE_FLTUND
;
844 case 0x004: /* Zero Divide */
845 info
.si_code
= FPE_FLTDIV
;
847 case 0x008: /* Overflow */
848 info
.si_code
= FPE_FLTOVF
;
850 case 0x020: /* Precision */
851 info
.si_code
= FPE_FLTRES
;
854 force_sig_info(SIGFPE
, &info
, task
);
857 asmlinkage
void do_spurious_interrupt_bug(struct pt_regs
* regs
)
861 asmlinkage
void __attribute__((weak
)) smp_thermal_interrupt(void)
865 asmlinkage
void __attribute__((weak
)) mce_threshold_interrupt(void)
870 * 'math_state_restore()' saves the current math information in the
871 * old math state array, and gets the new ones from the current task
873 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
874 * Don't touch unless you *really* know how it works.
876 asmlinkage
void math_state_restore(void)
878 struct task_struct
*me
= current
;
879 clts(); /* Allow maths ops (or we recurse) */
883 restore_fpu_checking(&me
->thread
.i387
.fxsave
);
884 me
->thread_info
->status
|= TS_USEDFPU
;
887 void do_call_debug(struct pt_regs
*regs
)
889 notify_die(DIE_CALL
, "debug call", regs
, 0, 255, SIGINT
);
892 void __init
trap_init(void)
894 set_intr_gate(0,÷_error
);
895 set_intr_gate_ist(1,&debug
,DEBUG_STACK
);
896 set_intr_gate_ist(2,&nmi
,NMI_STACK
);
897 set_system_gate(3,&int3
);
898 set_system_gate(4,&overflow
); /* int4 can be called from all */
899 set_intr_gate(5,&bounds
);
900 set_intr_gate(6,&invalid_op
);
901 set_intr_gate(7,&device_not_available
);
902 set_intr_gate_ist(8,&double_fault
, DOUBLEFAULT_STACK
);
903 set_intr_gate(9,&coprocessor_segment_overrun
);
904 set_intr_gate(10,&invalid_TSS
);
905 set_intr_gate(11,&segment_not_present
);
906 set_intr_gate_ist(12,&stack_segment
,STACKFAULT_STACK
);
907 set_intr_gate(13,&general_protection
);
908 set_intr_gate(14,&page_fault
);
909 set_intr_gate(15,&spurious_interrupt_bug
);
910 set_intr_gate(16,&coprocessor_error
);
911 set_intr_gate(17,&alignment_check
);
912 #ifdef CONFIG_X86_MCE
913 set_intr_gate_ist(18,&machine_check
, MCE_STACK
);
915 set_intr_gate(19,&simd_coprocessor_error
);
917 #ifdef CONFIG_IA32_EMULATION
918 set_system_gate(IA32_SYSCALL_VECTOR
, ia32_syscall
);
921 set_intr_gate(KDB_VECTOR
, call_debug
);
924 * Should be a barrier for any external CPU state.
930 /* Actual parsing is done early in setup.c. */
931 static int __init
oops_dummy(char *s
)
936 __setup("oops=", oops_dummy
);
938 static int __init
kstack_setup(char *s
)
940 kstack_depth_to_print
= simple_strtoul(s
,NULL
,0);
943 __setup("kstack=", kstack_setup
);