Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Pentium III FXSR, SSE support |
| 6 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
| 7 | */ |
| 8 | |
| 9 | /* |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 10 | * Handle hardware traps and faults. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/kallsyms.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 14 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/kprobes.h> |
Andrew Morton | 1e2af92 | 2006-09-27 01:51:15 -0700 | [diff] [blame] | 16 | #include <linux/uaccess.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 17 | #include <linux/kdebug.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/ptrace.h> |
| 21 | #include <linux/string.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 22 | #include <linux/delay.h> |
| 23 | #include <linux/errno.h> |
| 24 | #include <linux/kexec.h> |
| 25 | #include <linux/sched.h> |
| 26 | #include <linux/timer.h> |
| 27 | #include <linux/init.h> |
Jeremy Fitzhardinge | 91768d6 | 2006-12-08 02:36:21 -0800 | [diff] [blame] | 28 | #include <linux/bug.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 29 | #include <linux/nmi.h> |
| 30 | #include <linux/mm.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 31 | #include <linux/smp.h> |
| 32 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
| 34 | #ifdef CONFIG_EISA |
| 35 | #include <linux/ioport.h> |
| 36 | #include <linux/eisa.h> |
| 37 | #endif |
| 38 | |
| 39 | #ifdef CONFIG_MCA |
| 40 | #include <linux/mca.h> |
| 41 | #endif |
| 42 | |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 43 | #if defined(CONFIG_EDAC) |
| 44 | #include <linux/edac.h> |
| 45 | #endif |
| 46 | |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 47 | #include <asm/kmemcheck.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 48 | #include <asm/stacktrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <asm/debugreg.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 51 | #include <asm/atomic.h> |
| 52 | #include <asm/system.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 53 | #include <asm/traps.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <asm/desc.h> |
| 55 | #include <asm/i387.h> |
Hidetoshi Seto | 9e55e44 | 2009-06-15 17:22:15 +0900 | [diff] [blame] | 56 | #include <asm/mce.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 57 | |
Ingo Molnar | 1164dd0 | 2009-01-28 19:34:09 +0100 | [diff] [blame] | 58 | #include <asm/mach_traps.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 59 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 60 | #ifdef CONFIG_X86_64 |
Thomas Gleixner | 428cf90 | 2009-08-20 10:35:46 +0200 | [diff] [blame] | 61 | #include <asm/x86_init.h> |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 62 | #include <asm/pgalloc.h> |
| 63 | #include <asm/proto.h> |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 64 | #else |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 65 | #include <asm/processor-flags.h> |
Ingo Molnar | 8e6dafd | 2009-02-23 00:34:39 +0100 | [diff] [blame] | 66 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | asmlinkage int system_call(void); |
| 69 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | /* Do we ignore FPU interrupts ? */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 71 | char ignore_fpu_irq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
| 73 | /* |
| 74 | * The IDT has to be page-aligned to simplify the Pentium |
Tim Abbott | 07e81d6 | 2009-09-16 16:44:29 -0400 | [diff] [blame] | 75 | * F0 0F bug workaround. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | */ |
Tim Abbott | 07e81d6 | 2009-09-16 16:44:29 -0400 | [diff] [blame] | 77 | gate_desc idt_table[NR_VECTORS] __page_aligned_data = { { { { 0, 0 } } }, }; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 78 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Yinghai Lu | b77b881 | 2008-12-19 15:23:44 -0800 | [diff] [blame] | 80 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
| 81 | EXPORT_SYMBOL_GPL(used_vectors); |
| 82 | |
Alexander van Heukelum | badc765 | 2008-07-02 01:30:30 +0200 | [diff] [blame] | 83 | static int ignore_nmis; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 84 | |
Alexander van Heukelum | 762db43 | 2008-09-09 21:55:55 +0200 | [diff] [blame] | 85 | static inline void conditional_sti(struct pt_regs *regs) |
| 86 | { |
| 87 | if (regs->flags & X86_EFLAGS_IF) |
| 88 | local_irq_enable(); |
| 89 | } |
| 90 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 91 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
| 92 | { |
| 93 | inc_preempt_count(); |
| 94 | if (regs->flags & X86_EFLAGS_IF) |
| 95 | local_irq_enable(); |
| 96 | } |
| 97 | |
Thomas Gleixner | be71661 | 2009-01-13 23:36:34 +0100 | [diff] [blame] | 98 | static inline void conditional_cli(struct pt_regs *regs) |
| 99 | { |
| 100 | if (regs->flags & X86_EFLAGS_IF) |
| 101 | local_irq_disable(); |
| 102 | } |
| 103 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 104 | static inline void preempt_conditional_cli(struct pt_regs *regs) |
| 105 | { |
| 106 | if (regs->flags & X86_EFLAGS_IF) |
| 107 | local_irq_disable(); |
| 108 | dec_preempt_count(); |
| 109 | } |
| 110 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 111 | static void __kprobes |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 112 | do_trap(int trapnr, int signr, char *str, struct pt_regs *regs, |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 113 | long error_code, siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 115 | struct task_struct *tsk = current; |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 116 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 117 | #ifdef CONFIG_X86_32 |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 118 | if (regs->flags & X86_VM_MASK) { |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 119 | /* |
| 120 | * traps 0, 1, 3, 4, and 5 should be forwarded to vm86. |
| 121 | * On nmi (interrupt 2), do_trap should not be called. |
| 122 | */ |
| 123 | if (trapnr < 6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | goto vm86_trap; |
| 125 | goto trap_signal; |
| 126 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 127 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Vincent Hanquez | 717b594 | 2005-06-23 00:08:45 -0700 | [diff] [blame] | 129 | if (!user_mode(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | goto kernel_trap; |
| 131 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 132 | #ifdef CONFIG_X86_32 |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 133 | trap_signal: |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 134 | #endif |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 135 | /* |
| 136 | * We want error_code and trap_no set for userspace faults and |
| 137 | * kernelspace faults which result in die(), but not |
| 138 | * kernelspace faults which are fixed up. die() gives the |
| 139 | * process no chance to handle the signal and notice the |
| 140 | * kernel fault information, so that won't result in polluting |
| 141 | * the information about previously queued, but not yet |
| 142 | * delivered, faults. See also do_general_protection below. |
| 143 | */ |
| 144 | tsk->thread.error_code = error_code; |
| 145 | tsk->thread.trap_no = trapnr; |
| 146 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 147 | #ifdef CONFIG_X86_64 |
| 148 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
| 149 | printk_ratelimit()) { |
| 150 | printk(KERN_INFO |
| 151 | "%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
| 152 | tsk->comm, tsk->pid, str, |
| 153 | regs->ip, regs->sp, error_code); |
| 154 | print_vma_addr(" in ", regs->ip); |
| 155 | printk("\n"); |
| 156 | } |
| 157 | #endif |
| 158 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 159 | if (info) |
| 160 | force_sig_info(signr, info, tsk); |
| 161 | else |
| 162 | force_sig(signr, tsk); |
| 163 | return; |
| 164 | |
| 165 | kernel_trap: |
| 166 | if (!fixup_exception(regs)) { |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 167 | tsk->thread.error_code = error_code; |
| 168 | tsk->thread.trap_no = trapnr; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 169 | die(str, regs, error_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 171 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 173 | #ifdef CONFIG_X86_32 |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 174 | vm86_trap: |
| 175 | if (handle_vm86_trap((struct kernel_vm86_regs *) regs, |
| 176 | error_code, trapnr)) |
| 177 | goto trap_signal; |
| 178 | return; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 179 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 182 | #define DO_ERROR(trapnr, signr, str, name) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 183 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 184 | { \ |
| 185 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 186 | == NOTIFY_STOP) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 187 | return; \ |
Alexander van Heukelum | 61aef7d | 2008-09-09 21:55:56 +0200 | [diff] [blame] | 188 | conditional_sti(regs); \ |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 189 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 192 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 193 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 194 | { \ |
| 195 | siginfo_t info; \ |
| 196 | info.si_signo = signr; \ |
| 197 | info.si_errno = 0; \ |
| 198 | info.si_code = sicode; \ |
| 199 | info.si_addr = (void __user *)siaddr; \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 200 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 201 | == NOTIFY_STOP) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 202 | return; \ |
Alexander van Heukelum | 61aef7d | 2008-09-09 21:55:56 +0200 | [diff] [blame] | 203 | conditional_sti(regs); \ |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 204 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 207 | DO_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip) |
| 208 | DO_ERROR(4, SIGSEGV, "overflow", overflow) |
| 209 | DO_ERROR(5, SIGSEGV, "bounds", bounds) |
| 210 | DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip) |
Alexander van Heukelum | 51bc1ed | 2008-09-09 21:56:03 +0200 | [diff] [blame] | 211 | DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
Alexander van Heukelum | 6bf77bf | 2008-09-09 21:56:04 +0200 | [diff] [blame] | 212 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
Alexander van Heukelum | 36d936c | 2008-09-09 21:56:05 +0200 | [diff] [blame] | 213 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 214 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | f5ca818 | 2008-09-09 21:56:06 +0200 | [diff] [blame] | 215 | DO_ERROR(12, SIGBUS, "stack segment", stack_segment) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 216 | #endif |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 217 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 219 | #ifdef CONFIG_X86_64 |
| 220 | /* Runs on IST stack */ |
| 221 | dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code) |
| 222 | { |
| 223 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, |
| 224 | 12, SIGBUS) == NOTIFY_STOP) |
| 225 | return; |
| 226 | preempt_conditional_sti(regs); |
| 227 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); |
| 228 | preempt_conditional_cli(regs); |
| 229 | } |
| 230 | |
| 231 | dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) |
| 232 | { |
| 233 | static const char str[] = "double fault"; |
| 234 | struct task_struct *tsk = current; |
| 235 | |
| 236 | /* Return not checked because double check cannot be ignored */ |
| 237 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); |
| 238 | |
| 239 | tsk->thread.error_code = error_code; |
| 240 | tsk->thread.trap_no = 8; |
| 241 | |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 242 | /* |
| 243 | * This is always a kernel trap and never fixable (and thus must |
| 244 | * never return). |
| 245 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 246 | for (;;) |
| 247 | die(str, regs, error_code); |
| 248 | } |
| 249 | #endif |
| 250 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 251 | dotraplinkage void __kprobes |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 252 | do_general_protection(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | { |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 254 | struct task_struct *tsk; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 255 | |
Alexander van Heukelum | c6df0d7 | 2008-09-09 21:56:07 +0200 | [diff] [blame] | 256 | conditional_sti(regs); |
| 257 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 258 | #ifdef CONFIG_X86_32 |
gorcunov@gmail.com | 6b6891f | 2008-03-28 17:56:57 +0300 | [diff] [blame] | 259 | if (regs->flags & X86_VM_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | goto gp_in_vm86; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 261 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 263 | tsk = current; |
Vincent Hanquez | 717b594 | 2005-06-23 00:08:45 -0700 | [diff] [blame] | 264 | if (!user_mode(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | goto gp_in_kernel; |
| 266 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 267 | tsk->thread.error_code = error_code; |
| 268 | tsk->thread.trap_no = 13; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 269 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 270 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
| 271 | printk_ratelimit()) { |
Masoud Asgharifard Sharbiani | abd4f75 | 2007-07-22 11:12:28 +0200 | [diff] [blame] | 272 | printk(KERN_INFO |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 273 | "%s[%d] general protection ip:%lx sp:%lx error:%lx", |
| 274 | tsk->comm, task_pid_nr(tsk), |
| 275 | regs->ip, regs->sp, error_code); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 276 | print_vma_addr(" in ", regs->ip); |
| 277 | printk("\n"); |
| 278 | } |
Masoud Asgharifard Sharbiani | abd4f75 | 2007-07-22 11:12:28 +0200 | [diff] [blame] | 279 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 280 | force_sig(SIGSEGV, tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return; |
| 282 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 283 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | gp_in_vm86: |
| 285 | local_irq_enable(); |
| 286 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); |
| 287 | return; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 288 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
| 290 | gp_in_kernel: |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 291 | if (fixup_exception(regs)) |
| 292 | return; |
| 293 | |
| 294 | tsk->thread.error_code = error_code; |
| 295 | tsk->thread.trap_no = 13; |
| 296 | if (notify_die(DIE_GPF, "general protection fault", regs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | error_code, 13, SIGSEGV) == NOTIFY_STOP) |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 298 | return; |
| 299 | die("general protection fault", regs, error_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | } |
| 301 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 302 | static notrace __kprobes void |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 303 | mem_parity_error(unsigned char reason, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 305 | printk(KERN_EMERG |
| 306 | "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", |
| 307 | reason, smp_processor_id()); |
| 308 | |
| 309 | printk(KERN_EMERG |
| 310 | "You have some hardware problem, likely on the PCI bus.\n"); |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 311 | |
| 312 | #if defined(CONFIG_EDAC) |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 313 | if (edac_handler_set()) { |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 314 | edac_atomic_assert_error(); |
| 315 | return; |
| 316 | } |
| 317 | #endif |
| 318 | |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 319 | if (panic_on_unrecovered_nmi) |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 320 | panic("NMI: Not continuing"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 322 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
| 324 | /* Clear and disable the memory parity error line. */ |
Alexander van Heukelum | 7970479 | 2008-10-03 22:00:36 +0200 | [diff] [blame] | 325 | reason = (reason & 0xf) | 4; |
| 326 | outb(reason, 0x61); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 329 | static notrace __kprobes void |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 330 | io_check_error(unsigned char reason, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
| 332 | unsigned long i; |
| 333 | |
Dave Jones | 9c10780 | 2006-01-09 20:51:32 -0800 | [diff] [blame] | 334 | printk(KERN_EMERG "NMI: IOCK error (debug interrupt?)\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | show_registers(regs); |
| 336 | |
Kurt Garloff | 5211a24 | 2009-06-24 14:32:11 -0700 | [diff] [blame] | 337 | if (panic_on_io_nmi) |
| 338 | panic("NMI IOCK error: Not continuing"); |
| 339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | /* Re-enable the IOCK line, wait for a few seconds */ |
| 341 | reason = (reason & 0xf) | 8; |
| 342 | outb(reason, 0x61); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | i = 2000; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 345 | while (--i) |
| 346 | udelay(1000); |
| 347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | reason &= ~8; |
| 349 | outb(reason, 0x61); |
| 350 | } |
| 351 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 352 | static notrace __kprobes void |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 353 | unknown_nmi_error(unsigned char reason, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | { |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 355 | if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) == |
| 356 | NOTIFY_STOP) |
Jason Wessel | d359752 | 2008-02-15 14:55:53 -0600 | [diff] [blame] | 357 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | #ifdef CONFIG_MCA |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 359 | /* |
| 360 | * Might actually be able to figure out what the guilty party |
| 361 | * is: |
| 362 | */ |
| 363 | if (MCA_bus) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | mca_handle_nmi(); |
| 365 | return; |
| 366 | } |
| 367 | #endif |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 368 | printk(KERN_EMERG |
| 369 | "Uhhuh. NMI received for unknown reason %02x on CPU %d.\n", |
| 370 | reason, smp_processor_id()); |
| 371 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 372 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 373 | if (panic_on_unrecovered_nmi) |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 374 | panic("NMI: Not continuing"); |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 375 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 376 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
Steven Rostedt | 5deb45e | 2008-04-19 19:19:55 +0200 | [diff] [blame] | 379 | static notrace __kprobes void default_do_nmi(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | { |
| 381 | unsigned char reason = 0; |
Alexander van Heukelum | abd3480 | 2008-07-02 18:39:01 +0200 | [diff] [blame] | 382 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Alexander van Heukelum | abd3480 | 2008-07-02 18:39:01 +0200 | [diff] [blame] | 384 | cpu = smp_processor_id(); |
| 385 | |
| 386 | /* Only the BSP gets external NMIs from the system. */ |
| 387 | if (!cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | reason = get_nmi_reason(); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | if (!(reason & 0xc0)) { |
Jan Beulich | 20c0d2d | 2006-03-26 01:37:01 -0800 | [diff] [blame] | 391 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 392 | == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | return; |
| 394 | #ifdef CONFIG_X86_LOCAL_APIC |
| 395 | /* |
| 396 | * Ok, so this is none of the documented NMI sources, |
| 397 | * so it must be the NMI watchdog. |
| 398 | */ |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 399 | if (nmi_watchdog_tick(regs, reason)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | return; |
Alexander van Heukelum | abd3480 | 2008-07-02 18:39:01 +0200 | [diff] [blame] | 401 | if (!do_nmi_callback(regs, cpu)) |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 402 | unknown_nmi_error(reason, regs); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 403 | #else |
| 404 | unknown_nmi_error(reason, regs); |
| 405 | #endif |
Don Zickus | 2fbe7b2 | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | return; |
| 408 | } |
Jan Beulich | 20c0d2d | 2006-03-26 01:37:01 -0800 | [diff] [blame] | 409 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | return; |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 411 | |
| 412 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | if (reason & 0x80) |
| 414 | mem_parity_error(reason, regs); |
| 415 | if (reason & 0x40) |
| 416 | io_check_error(reason, regs); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 417 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | /* |
| 419 | * Reassert NMI in case it became active meanwhile |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 420 | * as it's edge-triggered: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | */ |
| 422 | reassert_nmi(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 423 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | } |
| 425 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 426 | dotraplinkage notrace __kprobes void |
| 427 | do_nmi(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | nmi_enter(); |
| 430 | |
Hiroshi Shimamoto | 915b0d0 | 2008-12-08 19:19:26 -0800 | [diff] [blame] | 431 | inc_irq_stat(__nmi_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Andi Kleen | 8f4e956 | 2007-07-22 11:12:32 +0200 | [diff] [blame] | 433 | if (!ignore_nmis) |
| 434 | default_do_nmi(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
| 436 | nmi_exit(); |
| 437 | } |
| 438 | |
Andi Kleen | 8f4e956 | 2007-07-22 11:12:32 +0200 | [diff] [blame] | 439 | void stop_nmi(void) |
| 440 | { |
| 441 | acpi_nmi_disable(); |
| 442 | ignore_nmis++; |
| 443 | } |
| 444 | |
| 445 | void restart_nmi(void) |
| 446 | { |
| 447 | ignore_nmis--; |
| 448 | acpi_nmi_enable(); |
| 449 | } |
| 450 | |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 451 | /* May run on IST stack. */ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 452 | dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | { |
Alexander van Heukelum | b94da1e | 2008-09-09 21:55:58 +0200 | [diff] [blame] | 454 | #ifdef CONFIG_KPROBES |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) |
| 456 | == NOTIFY_STOP) |
Stas Sergeev | 48c88211 | 2005-05-01 08:58:49 -0700 | [diff] [blame] | 457 | return; |
Alexander van Heukelum | b94da1e | 2008-09-09 21:55:58 +0200 | [diff] [blame] | 458 | #else |
| 459 | if (notify_die(DIE_TRAP, "int3", regs, error_code, 3, SIGTRAP) |
| 460 | == NOTIFY_STOP) |
| 461 | return; |
| 462 | #endif |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 463 | |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 464 | preempt_conditional_sti(regs); |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 465 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 466 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 469 | #ifdef CONFIG_X86_64 |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 470 | /* |
| 471 | * Help handler running on IST stack to switch back to user stack |
| 472 | * for scheduling or signal handling. The actual stack switch is done in |
| 473 | * entry.S |
| 474 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 475 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
| 476 | { |
| 477 | struct pt_regs *regs = eregs; |
| 478 | /* Did already sync */ |
| 479 | if (eregs == (struct pt_regs *)eregs->sp) |
| 480 | ; |
| 481 | /* Exception from user space */ |
| 482 | else if (user_mode(eregs)) |
| 483 | regs = task_pt_regs(current); |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 484 | /* |
| 485 | * Exception from kernel and interrupts are enabled. Move to |
| 486 | * kernel process stack. |
| 487 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 488 | else if (eregs->flags & X86_EFLAGS_IF) |
| 489 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); |
| 490 | if (eregs != regs) |
| 491 | *regs = *eregs; |
| 492 | return regs; |
| 493 | } |
| 494 | #endif |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | /* |
| 497 | * Our handling of the processor debug registers is non-trivial. |
| 498 | * We do not clear them on entry and exit from the kernel. Therefore |
| 499 | * it is possible to get a watchpoint trap here from inside the kernel. |
| 500 | * However, the code in ./ptrace.c has ensured that the user can |
| 501 | * only set watchpoints on userspace addresses. Therefore the in-kernel |
| 502 | * watchpoint trap can only occur in code which is reading/writing |
| 503 | * from user space. Such code must not hold kernel locks (since it |
| 504 | * can equally take a page fault), therefore it is safe to call |
| 505 | * force_sig_info even though that claims and releases locks. |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 506 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | * Code in ./signal.c ensures that the debug control register |
| 508 | * is restored before we deliver any signal, and therefore that |
| 509 | * user code runs with the correct debug control register even though |
| 510 | * we clear it here. |
| 511 | * |
| 512 | * Being careful here means that we don't have to be as careful in a |
| 513 | * lot of more complicated places (task switching can be a bit lazy |
| 514 | * about restoring all the debug state, and ptrace doesn't have to |
| 515 | * find every occurrence of the TF bit that could be saved away even |
| 516 | * by user code) |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 517 | * |
| 518 | * May run on IST stack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | */ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 520 | dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | struct task_struct *tsk = current; |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 523 | unsigned long dr6; |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 524 | int si_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 526 | get_debugreg(dr6, 6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
K.Prasad | 40f9249 | 2010-01-28 16:44:01 +0530 | [diff] [blame] | 528 | /* Filter out all the reserved bits which are preset to 1 */ |
| 529 | dr6 &= ~DR6_RESERVED; |
| 530 | |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 531 | /* Catch kmemcheck conditions first of all! */ |
Ingo Molnar | eadb8a0 | 2009-06-17 12:52:15 +0200 | [diff] [blame] | 532 | if ((dr6 & DR_STEP) && kmemcheck_trap(regs)) |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 533 | return; |
| 534 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 535 | /* DR6 may or may not be cleared by the CPU */ |
| 536 | set_debugreg(0, 6); |
Roland McGrath | 10faa81 | 2008-01-30 13:30:54 +0100 | [diff] [blame] | 537 | /* |
| 538 | * The processor cleared BTF, so don't mark that we need it set. |
| 539 | */ |
| 540 | clear_tsk_thread_flag(tsk, TIF_DEBUGCTLMSR); |
| 541 | tsk->thread.debugctlmsr = 0; |
| 542 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 543 | /* Store the virtualized DR6 value */ |
| 544 | tsk->thread.debugreg6 = dr6; |
| 545 | |
K.Prasad | 62edab9 | 2009-06-01 23:47:06 +0530 | [diff] [blame] | 546 | if (notify_die(DIE_DEBUG, "debug", regs, PTR_ERR(&dr6), error_code, |
| 547 | SIGTRAP) == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return; |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 549 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | /* It's safe to allow irq's after DR6 has been saved */ |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 551 | preempt_conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 553 | if (regs->flags & X86_VM_MASK) { |
| 554 | handle_vm86_trap((struct kernel_vm86_regs *) regs, |
| 555 | error_code, 1); |
| 556 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | /* |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 560 | * Single-stepping through system calls: ignore any exceptions in |
| 561 | * kernel space, but re-enable TF when returning to user mode. |
| 562 | * |
| 563 | * We already checked v86 mode above, so we can check for kernel mode |
| 564 | * by just checking the CPL of CS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | */ |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 566 | if ((dr6 & DR_STEP) && !user_mode(regs)) { |
| 567 | tsk->thread.debugreg6 &= ~DR_STEP; |
| 568 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
| 569 | regs->flags &= ~X86_EFLAGS_TF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | } |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 571 | si_code = get_si_code(tsk->thread.debugreg6); |
| 572 | if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS)) |
| 573 | send_sigtrap(tsk, regs, error_code, si_code); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 574 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | return; |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * Note that we play around with the 'TS' bit in an attempt to get |
| 581 | * the correct behaviour even in the presence of the asynchronous |
| 582 | * IRQ13 behaviour |
| 583 | */ |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 584 | void math_error(struct pt_regs *regs, int error_code, int trapnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | { |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame^] | 586 | struct task_struct *task = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | siginfo_t info; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 588 | unsigned short err; |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame^] | 589 | char *str = (trapnr == 16) ? "fpu exception" : "simd exception"; |
| 590 | |
| 591 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, SIGFPE) == NOTIFY_STOP) |
| 592 | return; |
| 593 | conditional_sti(regs); |
| 594 | |
| 595 | if (!user_mode_vm(regs)) |
| 596 | { |
| 597 | if (!fixup_exception(regs)) { |
| 598 | task->thread.error_code = error_code; |
| 599 | task->thread.trap_no = trapnr; |
| 600 | die(str, regs, error_code); |
| 601 | } |
| 602 | return; |
| 603 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | /* |
| 606 | * Save the info for the exception handler and clear the error. |
| 607 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | save_init_fpu(task); |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 609 | task->thread.trap_no = trapnr; |
| 610 | task->thread.error_code = error_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | info.si_signo = SIGFPE; |
| 612 | info.si_errno = 0; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 613 | info.si_addr = (void __user *)regs->ip; |
| 614 | if (trapnr == 16) { |
| 615 | unsigned short cwd, swd; |
| 616 | /* |
| 617 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 618 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 619 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 620 | * fault bit. We should only be taking one exception at a time, |
| 621 | * so if this combination doesn't produce any single exception, |
| 622 | * then we have a bad program that isn't synchronizing its FPU usage |
| 623 | * and it will suffer the consequences since we won't be able to |
| 624 | * fully reproduce the context of the exception |
| 625 | */ |
| 626 | cwd = get_fpu_cwd(task); |
| 627 | swd = get_fpu_swd(task); |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 628 | |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 629 | err = swd & ~cwd; |
| 630 | } else { |
| 631 | /* |
| 632 | * The SIMD FPU exceptions are handled a little differently, as there |
| 633 | * is only a single status/control register. Thus, to determine which |
| 634 | * unmasked exception was caught we must mask the exception mask bits |
| 635 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 636 | */ |
| 637 | unsigned short mxcsr = get_fpu_mxcsr(task); |
| 638 | err = ~(mxcsr >> 7) & mxcsr; |
| 639 | } |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 640 | |
| 641 | if (err & 0x001) { /* Invalid op */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 642 | /* |
| 643 | * swd & 0x240 == 0x040: Stack Underflow |
| 644 | * swd & 0x240 == 0x240: Stack Overflow |
| 645 | * User must clear the SF bit (0x40) if set |
| 646 | */ |
| 647 | info.si_code = FPE_FLTINV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 648 | } else if (err & 0x004) { /* Divide by Zero */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 649 | info.si_code = FPE_FLTDIV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 650 | } else if (err & 0x008) { /* Overflow */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 651 | info.si_code = FPE_FLTOVF; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 652 | } else if (err & 0x012) { /* Denormal, Underflow */ |
| 653 | info.si_code = FPE_FLTUND; |
| 654 | } else if (err & 0x020) { /* Precision */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 655 | info.si_code = FPE_FLTRES; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 656 | } else { |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 657 | /* |
| 658 | * If we're using IRQ 13, or supposedly even some trap 16 |
| 659 | * implementations, it's possible we get a spurious trap... |
| 660 | */ |
H. Peter Anvin | a73ad33 | 2008-12-25 10:39:01 -0800 | [diff] [blame] | 661 | return; /* Spurious trap, no error */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | force_sig_info(SIGFPE, &info, task); |
| 664 | } |
| 665 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 666 | dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | { |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 668 | #ifdef CONFIG_X86_32 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | ignore_fpu_irq = 1; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 670 | #endif |
| 671 | |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 672 | math_error(regs, error_code, 16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 675 | dotraplinkage void |
| 676 | do_simd_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | { |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 678 | #ifdef CONFIG_X86_32 |
Brian Gerst | 40d2e76 | 2010-03-21 09:00:43 -0400 | [diff] [blame] | 679 | ignore_fpu_irq = 1; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 680 | #endif |
Brian Gerst | 40d2e76 | 2010-03-21 09:00:43 -0400 | [diff] [blame] | 681 | |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 682 | math_error(regs, error_code, 19); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | } |
| 684 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 685 | dotraplinkage void |
| 686 | do_spurious_interrupt_bug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | { |
Alexander van Heukelum | cf81978 | 2008-09-09 21:56:08 +0200 | [diff] [blame] | 688 | conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | #if 0 |
| 690 | /* No need to warn about this any longer. */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 691 | printk(KERN_INFO "Ignoring P6 Local APIC Spurious Interrupt Bug...\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | #endif |
| 693 | } |
| 694 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 695 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) |
| 696 | { |
| 697 | } |
| 698 | |
Andi Kleen | 7856f6c | 2009-04-28 23:32:56 +0200 | [diff] [blame] | 699 | asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 700 | { |
| 701 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
| 703 | /* |
Jeremy Fitzhardinge | e6e9cac | 2009-04-24 00:40:59 -0700 | [diff] [blame] | 704 | * __math_state_restore assumes that cr0.TS is already clear and the |
| 705 | * fpu state is all ready for use. Used during context switch. |
| 706 | */ |
| 707 | void __math_state_restore(void) |
| 708 | { |
| 709 | struct thread_info *thread = current_thread_info(); |
| 710 | struct task_struct *tsk = thread->task; |
| 711 | |
| 712 | /* |
| 713 | * Paranoid restore. send a SIGSEGV if we fail to restore the state. |
| 714 | */ |
| 715 | if (unlikely(restore_fpu_checking(tsk))) { |
| 716 | stts(); |
| 717 | force_sig(SIGSEGV, tsk); |
| 718 | return; |
| 719 | } |
| 720 | |
| 721 | thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */ |
| 722 | tsk->fpu_counter++; |
| 723 | } |
| 724 | |
| 725 | /* |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 726 | * 'math_state_restore()' saves the current math information in the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | * old math state array, and gets the new ones from the current task |
| 728 | * |
| 729 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 730 | * Don't touch unless you *really* know how it works. |
| 731 | * |
| 732 | * Must be called with kernel preemption disabled (in this case, |
| 733 | * local interrupts are disabled at the call-site in entry.S). |
| 734 | */ |
Chuck Ebbert | acc2076 | 2006-12-07 02:14:01 +0100 | [diff] [blame] | 735 | asmlinkage void math_state_restore(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
| 737 | struct thread_info *thread = current_thread_info(); |
| 738 | struct task_struct *tsk = thread->task; |
| 739 | |
Suresh Siddha | aa283f4 | 2008-03-10 15:28:05 -0700 | [diff] [blame] | 740 | if (!tsk_used_math(tsk)) { |
| 741 | local_irq_enable(); |
| 742 | /* |
| 743 | * does a slab alloc which can sleep |
| 744 | */ |
| 745 | if (init_fpu(tsk)) { |
| 746 | /* |
| 747 | * ran out of memory! |
| 748 | */ |
| 749 | do_group_exit(SIGKILL); |
| 750 | return; |
| 751 | } |
| 752 | local_irq_disable(); |
| 753 | } |
| 754 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 755 | clts(); /* Allow maths ops (or we recurse) */ |
Jiri Slaby | fcb2ac5 | 2009-04-08 13:31:58 +0200 | [diff] [blame] | 756 | |
Jeremy Fitzhardinge | e6e9cac | 2009-04-24 00:40:59 -0700 | [diff] [blame] | 757 | __math_state_restore(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | } |
Rusty Russell | 5992b6d | 2007-07-19 01:49:21 -0700 | [diff] [blame] | 759 | EXPORT_SYMBOL_GPL(math_state_restore); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | #ifndef CONFIG_MATH_EMULATION |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 762 | void math_emulate(struct math_emu_info *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 764 | printk(KERN_EMERG |
| 765 | "math-emulation not enabled and no coprocessor found.\n"); |
| 766 | printk(KERN_EMERG "killing %s.\n", current->comm); |
| 767 | force_sig(SIGFPE, current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | schedule(); |
| 769 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | #endif /* CONFIG_MATH_EMULATION */ |
| 771 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 772 | dotraplinkage void __kprobes |
Brian Gerst | aa78bcf | 2009-02-10 09:51:45 -0500 | [diff] [blame] | 773 | do_device_not_available(struct pt_regs *regs, long error_code) |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 774 | { |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 775 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 776 | if (read_cr0() & X86_CR0_EM) { |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 777 | struct math_emu_info info = { }; |
| 778 | |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 779 | conditional_sti(regs); |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 780 | |
Brian Gerst | aa78bcf | 2009-02-10 09:51:45 -0500 | [diff] [blame] | 781 | info.regs = regs; |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 782 | math_emulate(&info); |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 783 | } else { |
| 784 | math_state_restore(); /* interrupts still off */ |
| 785 | conditional_sti(regs); |
| 786 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 787 | #else |
| 788 | math_state_restore(); |
| 789 | #endif |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 790 | } |
| 791 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 792 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 793 | dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code) |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 794 | { |
| 795 | siginfo_t info; |
| 796 | local_irq_enable(); |
| 797 | |
| 798 | info.si_signo = SIGILL; |
| 799 | info.si_errno = 0; |
| 800 | info.si_code = ILL_BADSTK; |
Hannes Eder | fc6fcdf | 2009-02-22 01:00:57 +0100 | [diff] [blame] | 801 | info.si_addr = NULL; |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 802 | if (notify_die(DIE_TRAP, "iret exception", |
| 803 | regs, error_code, 32, SIGILL) == NOTIFY_STOP) |
| 804 | return; |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 805 | do_trap(32, SIGILL, "iret exception", regs, error_code, &info); |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 806 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 807 | #endif |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | void __init trap_init(void) |
| 810 | { |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 811 | int i; |
| 812 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | #ifdef CONFIG_EISA |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 814 | void __iomem *p = early_ioremap(0x0FFFD9, 4); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 815 | |
| 816 | if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | EISA_bus = 1; |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 818 | early_iounmap(p, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | #endif |
| 820 | |
Alexander van Heukelum | 976382d | 2008-09-09 21:55:57 +0200 | [diff] [blame] | 821 | set_intr_gate(0, ÷_error); |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 822 | set_intr_gate_ist(1, &debug, DEBUG_STACK); |
| 823 | set_intr_gate_ist(2, &nmi, NMI_STACK); |
| 824 | /* int3 can be called from all */ |
| 825 | set_system_intr_gate_ist(3, &int3, DEBUG_STACK); |
| 826 | /* int4 can be called from all */ |
| 827 | set_system_intr_gate(4, &overflow); |
Alexander van Heukelum | 64f644c | 2008-09-09 21:56:00 +0200 | [diff] [blame] | 828 | set_intr_gate(5, &bounds); |
Alexander van Heukelum | 12394cf | 2008-09-09 21:56:01 +0200 | [diff] [blame] | 829 | set_intr_gate(6, &invalid_op); |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 830 | set_intr_gate(7, &device_not_available); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 831 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 832 | set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 833 | #else |
| 834 | set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK); |
| 835 | #endif |
Alexander van Heukelum | 51bc1ed | 2008-09-09 21:56:03 +0200 | [diff] [blame] | 836 | set_intr_gate(9, &coprocessor_segment_overrun); |
Alexander van Heukelum | 6bf77bf | 2008-09-09 21:56:04 +0200 | [diff] [blame] | 837 | set_intr_gate(10, &invalid_TSS); |
Alexander van Heukelum | 36d936c | 2008-09-09 21:56:05 +0200 | [diff] [blame] | 838 | set_intr_gate(11, &segment_not_present); |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 839 | set_intr_gate_ist(12, &stack_segment, STACKFAULT_STACK); |
Alexander van Heukelum | c6df0d7 | 2008-09-09 21:56:07 +0200 | [diff] [blame] | 840 | set_intr_gate(13, &general_protection); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 841 | set_intr_gate(14, &page_fault); |
Alexander van Heukelum | cf81978 | 2008-09-09 21:56:08 +0200 | [diff] [blame] | 842 | set_intr_gate(15, &spurious_interrupt_bug); |
Alexander van Heukelum | 252d28f | 2008-09-09 21:56:09 +0200 | [diff] [blame] | 843 | set_intr_gate(16, &coprocessor_error); |
Alexander van Heukelum | 5feedfd | 2008-09-09 21:56:10 +0200 | [diff] [blame] | 844 | set_intr_gate(17, &alignment_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | #ifdef CONFIG_X86_MCE |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 846 | set_intr_gate_ist(18, &machine_check, MCE_STACK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | #endif |
Alexander van Heukelum | b939bde | 2008-09-09 21:56:12 +0200 | [diff] [blame] | 848 | set_intr_gate(19, &simd_coprocessor_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 850 | /* Reserve all the builtin and the syscall vector: */ |
| 851 | for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) |
| 852 | set_bit(i, used_vectors); |
| 853 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 854 | #ifdef CONFIG_IA32_EMULATION |
| 855 | set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall); |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 856 | set_bit(IA32_SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 857 | #endif |
| 858 | |
| 859 | #ifdef CONFIG_X86_32 |
Jan Beulich | d43c6e8 | 2006-01-06 00:11:49 -0800 | [diff] [blame] | 860 | if (cpu_has_fxsr) { |
Jan Beulich | d43c6e8 | 2006-01-06 00:11:49 -0800 | [diff] [blame] | 861 | printk(KERN_INFO "Enabling fast FPU save and restore... "); |
| 862 | set_in_cr4(X86_CR4_OSFXSR); |
| 863 | printk("done.\n"); |
| 864 | } |
| 865 | if (cpu_has_xmm) { |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 866 | printk(KERN_INFO |
| 867 | "Enabling unmasked SIMD FPU exception support... "); |
Jan Beulich | d43c6e8 | 2006-01-06 00:11:49 -0800 | [diff] [blame] | 868 | set_in_cr4(X86_CR4_OSXMMEXCPT); |
| 869 | printk("done.\n"); |
| 870 | } |
| 871 | |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 872 | set_system_trap_gate(SYSCALL_VECTOR, &system_call); |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 873 | set_bit(SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 874 | #endif |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 875 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | /* |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 877 | * Should be a barrier for any external CPU state: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | */ |
| 879 | cpu_init(); |
| 880 | |
Thomas Gleixner | 428cf90 | 2009-08-20 10:35:46 +0200 | [diff] [blame] | 881 | x86_init.irqs.trap_init(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | } |