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>
33 #include <linux/kexec.h>
35 #include <asm/system.h>
36 #include <asm/uaccess.h>
38 #include <asm/atomic.h>
39 #include <asm/debugreg.h>
42 #include <asm/kdebug.h>
43 #include <asm/processor.h>
46 #include <asm/pgalloc.h>
48 #include <asm/proto.h>
51 asmlinkage void divide_error(void);
52 asmlinkage void debug(void);
53 asmlinkage void nmi(void);
54 asmlinkage void int3(void);
55 asmlinkage void overflow(void);
56 asmlinkage void bounds(void);
57 asmlinkage void invalid_op(void);
58 asmlinkage void device_not_available(void);
59 asmlinkage void double_fault(void);
60 asmlinkage void coprocessor_segment_overrun(void);
61 asmlinkage void invalid_TSS(void);
62 asmlinkage void segment_not_present(void);
63 asmlinkage void stack_segment(void);
64 asmlinkage void general_protection(void);
65 asmlinkage void page_fault(void);
66 asmlinkage void coprocessor_error(void);
67 asmlinkage void simd_coprocessor_error(void);
68 asmlinkage void reserved(void);
69 asmlinkage void alignment_check(void);
70 asmlinkage void machine_check(void);
71 asmlinkage void spurious_interrupt_bug(void);
73 ATOMIC_NOTIFIER_HEAD(die_chain);
75 extern char last_sysfs_file[];
77 int register_die_notifier(struct notifier_block *nb)
80 return atomic_notifier_chain_register(&die_chain, nb);
82 EXPORT_SYMBOL(register_die_notifier);
84 int unregister_die_notifier(struct notifier_block *nb)
86 return atomic_notifier_chain_unregister(&die_chain, nb);
88 EXPORT_SYMBOL(unregister_die_notifier);
90 static inline void conditional_sti(struct pt_regs *regs)
92 if (regs->eflags & X86_EFLAGS_IF)
96 static inline void preempt_conditional_sti(struct pt_regs *regs)
99 if (regs->eflags & X86_EFLAGS_IF)
103 static inline void preempt_conditional_cli(struct pt_regs *regs)
105 if (regs->eflags & X86_EFLAGS_IF)
107 /* Make sure to not schedule here because we could be running
108 on an exception stack. */
109 preempt_enable_no_resched();
112 static int kstack_depth_to_print = 10;
114 #ifdef CONFIG_KALLSYMS
115 #include <linux/kallsyms.h>
116 int printk_address(unsigned long address)
118 unsigned long offset = 0, symsize;
124 symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
126 return printk("[<%016lx>]", address);
128 modname = delim = "";
129 return printk("<%016lx>{%s%s%s%s%+ld}",
130 address, delim, modname, delim, symname, offset);
133 int printk_address(unsigned long address)
135 return printk("[<%016lx>]", address);
139 static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
140 unsigned *usedp, const char **idp)
142 static char ids[][8] = {
143 [DEBUG_STACK - 1] = "#DB",
144 [NMI_STACK - 1] = "NMI",
145 [DOUBLEFAULT_STACK - 1] = "#DF",
146 [STACKFAULT_STACK - 1] = "#SS",
147 [MCE_STACK - 1] = "#MC",
148 #if DEBUG_STKSZ > EXCEPTION_STKSZ
149 [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]"
154 for (k = 0; k < N_EXCEPTION_STACKS; k++) {
158 #if DEBUG_STKSZ > EXCEPTION_STKSZ
160 end = cpu_pda(cpu)->debugstack + DEBUG_STKSZ;
164 end = per_cpu(init_tss, cpu).ist[k];
169 if (stack >= end - EXCEPTION_STKSZ) {
170 if (*usedp & (1U << k))
174 return (unsigned long *)end;
176 #if DEBUG_STKSZ > EXCEPTION_STKSZ
177 if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) {
178 unsigned j = N_EXCEPTION_STACKS - 1;
182 end -= EXCEPTION_STKSZ;
183 ids[j][4] = '1' + (j - N_EXCEPTION_STACKS);
184 } while (stack < end - EXCEPTION_STKSZ);
185 if (*usedp & (1U << j))
189 return (unsigned long *)end;
197 * x86-64 can have upto three kernel stacks:
200 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
203 void show_trace(unsigned long *stack)
205 const unsigned cpu = safe_smp_processor_id();
206 unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
210 printk("\nCall Trace:");
212 #define HANDLE_STACK(cond) \
214 unsigned long addr = *stack++; \
215 if (kernel_text_address(addr)) { \
223 * If the address is either in the text segment of the \
224 * kernel, or in the region which contains vmalloc'ed \
225 * memory, it *may* be the address of a calling \
226 * routine; if so, print it so that someone tracing \
227 * down the cause of the crash will be able to figure \
228 * out the call path that was taken. \
230 i += printk_address(addr); \
236 unsigned long *estack_end;
237 estack_end = in_exception_stack(cpu, (unsigned long)stack,
241 i += printk(" <%s>", id);
242 HANDLE_STACK (stack < estack_end);
243 i += printk(" <EOE>");
244 stack = (unsigned long *) estack_end[-2];
248 unsigned long *irqstack;
249 irqstack = irqstack_end -
250 (IRQSTACKSIZE - 64) / sizeof(*irqstack);
252 if (stack >= irqstack && stack < irqstack_end) {
253 i += printk(" <IRQ>");
254 HANDLE_STACK (stack < irqstack_end);
255 stack = (unsigned long *) (irqstack_end[-1]);
257 i += printk(" <EOI>");
264 HANDLE_STACK (((long) stack & (THREAD_SIZE-1)) != 0);
269 void show_stack(struct task_struct *tsk, unsigned long * rsp)
271 unsigned long *stack;
273 const int cpu = safe_smp_processor_id();
274 unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr);
275 unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE);
277 // debugging aid: "show_stack(NULL, NULL);" prints the
278 // back trace for this cpu.
282 rsp = (unsigned long *)tsk->thread.rsp;
284 rsp = (unsigned long *)&rsp;
288 for(i=0; i < kstack_depth_to_print; i++) {
289 if (stack >= irqstack && stack <= irqstack_end) {
290 if (stack == irqstack_end) {
291 stack = (unsigned long *) (irqstack_end[-1]);
295 if (((long) stack & (THREAD_SIZE-1)) == 0)
298 if (i && ((i % 4) == 0))
300 printk("%016lx ", *stack++);
301 touch_nmi_watchdog();
303 show_trace((unsigned long *)rsp);
307 * The architecture-independent dump_stack generator
309 void dump_stack(void)
315 EXPORT_SYMBOL(dump_stack);
317 void show_registers(struct pt_regs *regs)
320 int in_kernel = !user_mode(regs);
322 const int cpu = safe_smp_processor_id();
323 struct task_struct *cur = cpu_pda(cpu)->pcurrent;
327 printk("CPU %d ", cpu);
329 printk("Process %s (pid: %d[#%u], threadinfo %p, task %p)\n",
330 cur->comm, cur->pid, cur->xid,
331 task_thread_info(cur), cur);
334 * When in-kernel, we also print out the stack and code at the
335 * time of the fault..
340 show_stack(NULL, (unsigned long*)rsp);
343 if (regs->rip < PAGE_OFFSET)
346 for (i=0; i<20; i++) {
348 if (__get_user(c, &((unsigned char*)regs->rip)[i])) {
350 printk(" Bad RIP value.");
359 void handle_BUG(struct pt_regs *regs)
363 const char *prefix = "";
367 if (__copy_from_user(&f, (const void __user *) regs->rip,
368 sizeof(struct bug_frame)))
370 if (f.filename >= 0 ||
371 f.ud2[0] != 0x0f || f.ud2[1] != 0x0b)
373 len = __strnlen_user((char *)(long)f.filename, PATH_MAX) - 1;
374 if (len < 0 || len >= PATH_MAX)
375 f.filename = (int)(long)"unmapped filename";
377 f.filename += len - 50;
380 printk("----------- [cut here ] --------- [please bite here ] ---------\n");
381 printk(KERN_ALERT "Kernel BUG at %s%.50s:%d\n", prefix, (char *)(long)f.filename, f.line);
385 void out_of_line_bug(void)
391 static DEFINE_SPINLOCK(die_lock);
392 static int die_owner = -1;
393 static unsigned int die_nest_count;
395 unsigned __kprobes long oops_begin(void)
397 int cpu = safe_smp_processor_id();
400 /* racy, but better than risking deadlock. */
401 local_irq_save(flags);
402 if (!spin_trylock(&die_lock)) {
403 if (cpu == die_owner)
404 /* nested oops. should stop eventually */;
406 spin_lock(&die_lock);
415 void __kprobes oops_end(unsigned long flags)
421 /* We still own the lock */
422 local_irq_restore(flags);
424 /* Nest count reaches zero, release the lock. */
425 spin_unlock_irqrestore(&die_lock, flags);
430 void __kprobes __die(const char * str, struct pt_regs * regs, long err)
432 static int die_counter;
433 printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter);
434 #ifdef CONFIG_PREEMPT
440 #ifdef CONFIG_DEBUG_PAGEALLOC
441 printk("DEBUG_PAGEALLOC");
445 printk(KERN_ALERT "last sysfs file: %s\n", last_sysfs_file);
447 notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV);
448 show_registers(regs);
449 /* Executive summary in case the oops scrolled away */
450 printk(KERN_ALERT "RIP ");
451 printk_address(regs->rip);
452 printk(" RSP <%016lx>\n", regs->rsp);
453 if (kexec_should_crash(current))
457 void die(const char * str, struct pt_regs * regs, long err)
459 unsigned long flags = oops_begin();
462 __die(str, regs, err);
467 void __kprobes die_nmi(char *str, struct pt_regs *regs)
469 unsigned long flags = oops_begin();
472 * We are in trouble anyway, lets at least try
473 * to get a message out.
475 printk(str, safe_smp_processor_id());
476 show_registers(regs);
477 if (kexec_should_crash(current))
479 if (panic_on_timeout || panic_on_oops)
480 panic("nmi watchdog");
481 printk("console shuts up ...\n");
488 static void __kprobes do_trap(int trapnr, int signr, char *str,
489 struct pt_regs * regs, long error_code,
492 struct task_struct *tsk = current;
494 tsk->thread.error_code = error_code;
495 tsk->thread.trap_no = trapnr;
497 if (user_mode(regs)) {
498 if (exception_trace && unhandled_signal(tsk, signr))
500 "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n",
501 tsk->comm, tsk->pid, str,
502 regs->rip, regs->rsp, error_code);
505 force_sig_info(signr, info, tsk);
507 force_sig(signr, tsk);
514 const struct exception_table_entry *fixup;
515 fixup = search_exception_tables(regs->rip);
517 regs->rip = fixup->fixup;
519 die(str, regs, error_code);
524 #define DO_ERROR(trapnr, signr, str, name) \
525 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
527 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
530 conditional_sti(regs); \
531 do_trap(trapnr, signr, str, regs, error_code, NULL); \
534 #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
535 asmlinkage void do_##name(struct pt_regs * regs, long error_code) \
538 info.si_signo = signr; \
540 info.si_code = sicode; \
541 info.si_addr = (void __user *)siaddr; \
542 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \
545 conditional_sti(regs); \
546 do_trap(trapnr, signr, str, regs, error_code, &info); \
549 DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip)
550 DO_ERROR( 4, SIGSEGV, "overflow", overflow)
551 DO_ERROR( 5, SIGSEGV, "bounds", bounds)
552 DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip)
553 DO_ERROR( 7, SIGSEGV, "device not available", device_not_available)
554 DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
555 DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
556 DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
557 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
558 DO_ERROR(18, SIGSEGV, "reserved", reserved)
560 /* Runs on IST stack */
561 asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code)
563 if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
564 12, SIGBUS) == NOTIFY_STOP)
566 preempt_conditional_sti(regs);
567 do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
568 preempt_conditional_cli(regs);
571 asmlinkage void do_double_fault(struct pt_regs * regs, long error_code)
573 static const char str[] = "double fault";
574 struct task_struct *tsk = current;
576 /* Return not checked because double check cannot be ignored */
577 notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
579 tsk->thread.error_code = error_code;
580 tsk->thread.trap_no = 8;
582 /* This is always a kernel trap and never fixable (and thus must
585 die(str, regs, error_code);
588 asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
591 struct task_struct *tsk = current;
593 conditional_sti(regs);
595 tsk->thread.error_code = error_code;
596 tsk->thread.trap_no = 13;
598 if (user_mode(regs)) {
599 if (exception_trace && unhandled_signal(tsk, SIGSEGV))
601 "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n",
603 regs->rip, regs->rsp, error_code);
605 force_sig(SIGSEGV, tsk);
611 const struct exception_table_entry *fixup;
612 fixup = search_exception_tables(regs->rip);
614 regs->rip = fixup->fixup;
617 if (notify_die(DIE_GPF, "general protection fault", regs,
618 error_code, 13, SIGSEGV) == NOTIFY_STOP)
620 die("general protection fault", regs, error_code);
624 static __kprobes void
625 mem_parity_error(unsigned char reason, struct pt_regs * regs)
627 printk("Uhhuh. NMI received. Dazed and confused, but trying to continue\n");
628 printk("You probably have a hardware problem with your RAM chips\n");
630 /* Clear and disable the memory parity error line. */
631 reason = (reason & 0xf) | 4;
635 static __kprobes void
636 io_check_error(unsigned char reason, struct pt_regs * regs)
638 printk("NMI: IOCK error (debug interrupt?)\n");
639 show_registers(regs);
641 /* Re-enable the IOCK line, wait for a few seconds */
642 reason = (reason & 0xf) | 8;
649 static __kprobes void
650 unknown_nmi_error(unsigned char reason, struct pt_regs * regs)
651 { printk("Uhhuh. NMI received for unknown reason %02x.\n", reason);
652 printk("Dazed and confused, but trying to continue\n");
653 printk("Do you have a strange power saving mode enabled?\n");
656 /* Runs on IST stack. This code must keep interrupts off all the time.
657 Nested NMIs are prevented by the CPU. */
658 asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs)
660 unsigned char reason = 0;
663 cpu = smp_processor_id();
665 /* Only the BSP gets external NMIs from the system. */
667 reason = get_nmi_reason();
669 if (!(reason & 0xc0)) {
670 if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
673 #ifdef CONFIG_X86_LOCAL_APIC
675 * Ok, so this is none of the documented NMI sources,
676 * so it must be the NMI watchdog.
678 if (nmi_watchdog > 0) {
679 nmi_watchdog_tick(regs,reason);
683 unknown_nmi_error(reason, regs);
686 if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP)
689 /* AK: following checks seem to be broken on modern chipsets. FIXME */
692 mem_parity_error(reason, regs);
694 io_check_error(reason, regs);
697 /* runs on IST stack. */
698 asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code)
700 if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) {
703 preempt_conditional_sti(regs);
704 do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
705 preempt_conditional_cli(regs);
708 /* Help handler running on IST stack to switch back to user stack
709 for scheduling or signal handling. The actual stack switch is done in
711 asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
713 struct pt_regs *regs = eregs;
714 /* Did already sync */
715 if (eregs == (struct pt_regs *)eregs->rsp)
717 /* Exception from user space */
718 else if (user_mode(eregs))
719 regs = task_pt_regs(current);
720 /* Exception from kernel and interrupts are enabled. Move to
721 kernel process stack. */
722 else if (eregs->eflags & X86_EFLAGS_IF)
723 regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs));
729 /* runs on IST stack. */
730 asmlinkage void __kprobes do_debug(struct pt_regs * regs,
731 unsigned long error_code)
733 unsigned long condition;
734 struct task_struct *tsk = current;
737 get_debugreg(condition, 6);
739 if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code,
740 SIGTRAP) == NOTIFY_STOP)
743 preempt_conditional_sti(regs);
745 /* Mask out spurious debug traps due to lazy DR7 setting */
746 if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) {
747 if (!tsk->thread.debugreg7) {
752 tsk->thread.debugreg6 = condition;
754 /* Mask out spurious TF errors due to lazy TF clearing */
755 if (condition & DR_STEP) {
757 * The TF error should be masked out only if the current
758 * process is not traced and if the TRAP flag has been set
759 * previously by a tracing process (condition detected by
760 * the PT_DTRACE flag); remember that the i386 TRAP flag
761 * can be modified by the process itself in user mode,
762 * allowing programs to debug themselves without the ptrace()
765 if (!user_mode(regs))
766 goto clear_TF_reenable;
768 * Was the TF flag set by a debugger? If so, clear it now,
769 * so that register information is correct.
771 if (tsk->ptrace & PT_DTRACE) {
772 regs->eflags &= ~TF_MASK;
773 tsk->ptrace &= ~PT_DTRACE;
777 /* Ok, finally something we can handle */
778 tsk->thread.trap_no = 1;
779 tsk->thread.error_code = error_code;
780 info.si_signo = SIGTRAP;
782 info.si_code = TRAP_BRKPT;
783 info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL;
784 force_sig_info(SIGTRAP, &info, tsk);
787 set_debugreg(0UL, 7);
788 preempt_conditional_cli(regs);
792 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
793 regs->eflags &= ~TF_MASK;
794 preempt_conditional_cli(regs);
797 static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
799 const struct exception_table_entry *fixup;
800 fixup = search_exception_tables(regs->rip);
802 regs->rip = fixup->fixup;
805 notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
806 /* Illegal floating point operation in the kernel */
807 current->thread.trap_no = trapnr;
813 * Note that we play around with the 'TS' bit in an attempt to get
814 * the correct behaviour even in the presence of the asynchronous
817 asmlinkage void do_coprocessor_error(struct pt_regs *regs)
819 void __user *rip = (void __user *)(regs->rip);
820 struct task_struct * task;
822 unsigned short cwd, swd;
824 conditional_sti(regs);
825 if (!user_mode(regs) &&
826 kernel_math_error(regs, "kernel x87 math error", 16))
830 * Save the info for the exception handler and clear the error.
834 task->thread.trap_no = 16;
835 task->thread.error_code = 0;
836 info.si_signo = SIGFPE;
838 info.si_code = __SI_FAULT;
841 * (~cwd & swd) will mask out exceptions that are not set to unmasked
842 * status. 0x3f is the exception bits in these regs, 0x200 is the
843 * C1 reg you need in case of a stack fault, 0x040 is the stack
844 * fault bit. We should only be taking one exception at a time,
845 * so if this combination doesn't produce any single exception,
846 * then we have a bad program that isn't synchronizing its FPU usage
847 * and it will suffer the consequences since we won't be able to
848 * fully reproduce the context of the exception
850 cwd = get_fpu_cwd(task);
851 swd = get_fpu_swd(task);
852 switch (swd & ~cwd & 0x3f) {
856 case 0x001: /* Invalid Op */
858 * swd & 0x240 == 0x040: Stack Underflow
859 * swd & 0x240 == 0x240: Stack Overflow
860 * User must clear the SF bit (0x40) if set
862 info.si_code = FPE_FLTINV;
864 case 0x002: /* Denormalize */
865 case 0x010: /* Underflow */
866 info.si_code = FPE_FLTUND;
868 case 0x004: /* Zero Divide */
869 info.si_code = FPE_FLTDIV;
871 case 0x008: /* Overflow */
872 info.si_code = FPE_FLTOVF;
874 case 0x020: /* Precision */
875 info.si_code = FPE_FLTRES;
878 force_sig_info(SIGFPE, &info, task);
881 asmlinkage void bad_intr(void)
883 printk("bad interrupt");
886 asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs)
888 void __user *rip = (void __user *)(regs->rip);
889 struct task_struct * task;
891 unsigned short mxcsr;
893 conditional_sti(regs);
894 if (!user_mode(regs) &&
895 kernel_math_error(regs, "kernel simd math error", 19))
899 * Save the info for the exception handler and clear the error.
903 task->thread.trap_no = 19;
904 task->thread.error_code = 0;
905 info.si_signo = SIGFPE;
907 info.si_code = __SI_FAULT;
910 * The SIMD FPU exceptions are handled a little differently, as there
911 * is only a single status/control register. Thus, to determine which
912 * unmasked exception was caught we must mask the exception mask bits
913 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
915 mxcsr = get_fpu_mxcsr(task);
916 switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) {
920 case 0x001: /* Invalid Op */
921 info.si_code = FPE_FLTINV;
923 case 0x002: /* Denormalize */
924 case 0x010: /* Underflow */
925 info.si_code = FPE_FLTUND;
927 case 0x004: /* Zero Divide */
928 info.si_code = FPE_FLTDIV;
930 case 0x008: /* Overflow */
931 info.si_code = FPE_FLTOVF;
933 case 0x020: /* Precision */
934 info.si_code = FPE_FLTRES;
937 force_sig_info(SIGFPE, &info, task);
940 asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs)
944 asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
948 asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
953 * 'math_state_restore()' saves the current math information in the
954 * old math state array, and gets the new ones from the current task
956 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
957 * Don't touch unless you *really* know how it works.
959 asmlinkage void math_state_restore(void)
961 struct task_struct *me = current;
962 clts(); /* Allow maths ops (or we recurse) */
966 restore_fpu_checking(&me->thread.i387.fxsave);
967 task_thread_info(me)->status |= TS_USEDFPU;
970 void __init trap_init(void)
972 set_intr_gate(0,÷_error);
973 set_intr_gate_ist(1,&debug,DEBUG_STACK);
974 set_intr_gate_ist(2,&nmi,NMI_STACK);
975 set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */
976 set_system_gate(4,&overflow); /* int4 can be called from all */
977 set_intr_gate(5,&bounds);
978 set_intr_gate(6,&invalid_op);
979 set_intr_gate(7,&device_not_available);
980 set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK);
981 set_intr_gate(9,&coprocessor_segment_overrun);
982 set_intr_gate(10,&invalid_TSS);
983 set_intr_gate(11,&segment_not_present);
984 set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK);
985 set_intr_gate(13,&general_protection);
986 set_intr_gate(14,&page_fault);
987 set_intr_gate(15,&spurious_interrupt_bug);
988 set_intr_gate(16,&coprocessor_error);
989 set_intr_gate(17,&alignment_check);
990 #ifdef CONFIG_X86_MCE
991 set_intr_gate_ist(18,&machine_check, MCE_STACK);
993 set_intr_gate(19,&simd_coprocessor_error);
995 #ifdef CONFIG_IA32_EMULATION
996 set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
1000 * Should be a barrier for any external CPU state.
1006 /* Actual parsing is done early in setup.c. */
1007 static int __init oops_dummy(char *s)
1012 __setup("oops=", oops_dummy);
1014 static int __init kstack_setup(char *s)
1016 kstack_depth_to_print = simple_strtoul(s,NULL,0);
1019 __setup("kstack=", kstack_setup);