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 | */ |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Frederic Weisbecker | 56dd947 | 2013-02-24 00:23:25 +0100 | [diff] [blame] | 15 | #include <linux/context_tracking.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kallsyms.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 18 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/kprobes.h> |
Andrew Morton | 1e2af92 | 2006-09-27 01:51:15 -0700 | [diff] [blame] | 20 | #include <linux/uaccess.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 21 | #include <linux/kdebug.h> |
Jason Wessel | f503b5a | 2010-05-20 21:04:25 -0500 | [diff] [blame] | 22 | #include <linux/kgdb.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/ptrace.h> |
Oleg Nesterov | b02ef20 | 2014-05-12 18:24:45 +0200 | [diff] [blame] | 26 | #include <linux/uprobes.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 27 | #include <linux/string.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 28 | #include <linux/delay.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/kexec.h> |
| 31 | #include <linux/sched.h> |
| 32 | #include <linux/timer.h> |
| 33 | #include <linux/init.h> |
Jeremy Fitzhardinge | 91768d6 | 2006-12-08 02:36:21 -0800 | [diff] [blame] | 34 | #include <linux/bug.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 35 | #include <linux/nmi.h> |
| 36 | #include <linux/mm.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 37 | #include <linux/smp.h> |
| 38 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
| 40 | #ifdef CONFIG_EISA |
| 41 | #include <linux/ioport.h> |
| 42 | #include <linux/eisa.h> |
| 43 | #endif |
| 44 | |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 45 | #if defined(CONFIG_EDAC) |
| 46 | #include <linux/edac.h> |
| 47 | #endif |
| 48 | |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 49 | #include <asm/kmemcheck.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 50 | #include <asm/stacktrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | #include <asm/debugreg.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 53 | #include <linux/atomic.h> |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 54 | #include <asm/ftrace.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 55 | #include <asm/traps.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <asm/desc.h> |
| 57 | #include <asm/i387.h> |
Linus Torvalds | 1361b83 | 2012-02-21 13:19:22 -0800 | [diff] [blame] | 58 | #include <asm/fpu-internal.h> |
Hidetoshi Seto | 9e55e44 | 2009-06-15 17:22:15 +0900 | [diff] [blame] | 59 | #include <asm/mce.h> |
Kees Cook | 4eefbe7 | 2013-04-10 12:24:22 -0700 | [diff] [blame] | 60 | #include <asm/fixmap.h> |
Ingo Molnar | 1164dd0 | 2009-01-28 19:34:09 +0100 | [diff] [blame] | 61 | #include <asm/mach_traps.h> |
Jiri Kosina | 17f4157 | 2013-07-23 10:09:28 +0200 | [diff] [blame] | 62 | #include <asm/alternative.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 63 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 64 | #ifdef CONFIG_X86_64 |
Thomas Gleixner | 428cf90 | 2009-08-20 10:35:46 +0200 | [diff] [blame] | 65 | #include <asm/x86_init.h> |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 66 | #include <asm/pgalloc.h> |
| 67 | #include <asm/proto.h> |
Kees Cook | 4df05f3 | 2013-07-16 11:34:41 -0700 | [diff] [blame] | 68 | |
| 69 | /* No need to be aligned, but done to keep all IDTs defined the same way. */ |
| 70 | gate_desc debug_idt_table[NR_VECTORS] __page_aligned_bss; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 71 | #else |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 72 | #include <asm/processor-flags.h> |
Ingo Molnar | 8e6dafd | 2009-02-23 00:34:39 +0100 | [diff] [blame] | 73 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | asmlinkage int system_call(void); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 76 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Kees Cook | 4df05f3 | 2013-07-16 11:34:41 -0700 | [diff] [blame] | 78 | /* Must be page-aligned because the real IDT is used in a fixmap. */ |
| 79 | gate_desc idt_table[NR_VECTORS] __page_aligned_bss; |
| 80 | |
Yinghai Lu | b77b881 | 2008-12-19 15:23:44 -0800 | [diff] [blame] | 81 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
| 82 | EXPORT_SYMBOL_GPL(used_vectors); |
| 83 | |
Alexander van Heukelum | 762db43 | 2008-09-09 21:55:55 +0200 | [diff] [blame] | 84 | static inline void conditional_sti(struct pt_regs *regs) |
| 85 | { |
| 86 | if (regs->flags & X86_EFLAGS_IF) |
| 87 | local_irq_enable(); |
| 88 | } |
| 89 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 90 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
| 91 | { |
Peter Zijlstra | bdb4380 | 2013-09-10 12:15:23 +0200 | [diff] [blame] | 92 | preempt_count_inc(); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 93 | if (regs->flags & X86_EFLAGS_IF) |
| 94 | local_irq_enable(); |
| 95 | } |
| 96 | |
Thomas Gleixner | be71661 | 2009-01-13 23:36:34 +0100 | [diff] [blame] | 97 | static inline void conditional_cli(struct pt_regs *regs) |
| 98 | { |
| 99 | if (regs->flags & X86_EFLAGS_IF) |
| 100 | local_irq_disable(); |
| 101 | } |
| 102 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 103 | static inline void preempt_conditional_cli(struct pt_regs *regs) |
| 104 | { |
| 105 | if (regs->flags & X86_EFLAGS_IF) |
| 106 | local_irq_disable(); |
Peter Zijlstra | bdb4380 | 2013-09-10 12:15:23 +0200 | [diff] [blame] | 107 | preempt_count_dec(); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 108 | } |
| 109 | |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 110 | static nokprobe_inline int |
Frederic Weisbecker | c416ddf | 2012-09-25 14:51:19 +0200 | [diff] [blame] | 111 | do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str, |
| 112 | struct pt_regs *regs, long error_code) |
| 113 | { |
| 114 | #ifdef CONFIG_X86_32 |
| 115 | if (regs->flags & X86_VM_MASK) { |
| 116 | /* |
| 117 | * Traps 0, 1, 3, 4, and 5 should be forwarded to vm86. |
| 118 | * On nmi (interrupt 2), do_trap should not be called. |
| 119 | */ |
| 120 | if (trapnr < X86_TRAP_UD) { |
| 121 | if (!handle_vm86_trap((struct kernel_vm86_regs *) regs, |
| 122 | error_code, trapnr)) |
| 123 | return 0; |
| 124 | } |
| 125 | return -1; |
| 126 | } |
| 127 | #endif |
| 128 | if (!user_mode(regs)) { |
| 129 | if (!fixup_exception(regs)) { |
| 130 | tsk->thread.error_code = error_code; |
| 131 | tsk->thread.trap_nr = trapnr; |
| 132 | die(str, regs, error_code); |
| 133 | } |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | return -1; |
| 138 | } |
| 139 | |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 140 | static siginfo_t *fill_trap_info(struct pt_regs *regs, int signr, int trapnr, |
| 141 | siginfo_t *info) |
Oleg Nesterov | 958d3d7 | 2014-05-07 17:59:39 +0200 | [diff] [blame] | 142 | { |
| 143 | unsigned long siaddr; |
| 144 | int sicode; |
| 145 | |
| 146 | switch (trapnr) { |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 147 | default: |
| 148 | return SEND_SIG_PRIV; |
| 149 | |
Oleg Nesterov | 958d3d7 | 2014-05-07 17:59:39 +0200 | [diff] [blame] | 150 | case X86_TRAP_DE: |
| 151 | sicode = FPE_INTDIV; |
Oleg Nesterov | b02ef20 | 2014-05-12 18:24:45 +0200 | [diff] [blame] | 152 | siaddr = uprobe_get_trap_addr(regs); |
Oleg Nesterov | 958d3d7 | 2014-05-07 17:59:39 +0200 | [diff] [blame] | 153 | break; |
| 154 | case X86_TRAP_UD: |
| 155 | sicode = ILL_ILLOPN; |
Oleg Nesterov | b02ef20 | 2014-05-12 18:24:45 +0200 | [diff] [blame] | 156 | siaddr = uprobe_get_trap_addr(regs); |
Oleg Nesterov | 958d3d7 | 2014-05-07 17:59:39 +0200 | [diff] [blame] | 157 | break; |
| 158 | case X86_TRAP_AC: |
| 159 | sicode = BUS_ADRALN; |
| 160 | siaddr = 0; |
| 161 | break; |
| 162 | } |
| 163 | |
| 164 | info->si_signo = signr; |
| 165 | info->si_errno = 0; |
| 166 | info->si_code = sicode; |
| 167 | info->si_addr = (void __user *)siaddr; |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 168 | return info; |
Oleg Nesterov | 958d3d7 | 2014-05-07 17:59:39 +0200 | [diff] [blame] | 169 | } |
| 170 | |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 171 | static void |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 172 | do_trap(int trapnr, int signr, char *str, struct pt_regs *regs, |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 173 | long error_code, siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 175 | struct task_struct *tsk = current; |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Frederic Weisbecker | c416ddf | 2012-09-25 14:51:19 +0200 | [diff] [blame] | 178 | if (!do_trap_no_signal(tsk, trapnr, str, regs, error_code)) |
| 179 | return; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 180 | /* |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 181 | * We want error_code and trap_nr set for userspace faults and |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 182 | * kernelspace faults which result in die(), but not |
| 183 | * kernelspace faults which are fixed up. die() gives the |
| 184 | * process no chance to handle the signal and notice the |
| 185 | * kernel fault information, so that won't result in polluting |
| 186 | * the information about previously queued, but not yet |
| 187 | * delivered, faults. See also do_general_protection below. |
| 188 | */ |
| 189 | tsk->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 190 | tsk->thread.trap_nr = trapnr; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 191 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 192 | #ifdef CONFIG_X86_64 |
| 193 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
| 194 | printk_ratelimit()) { |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 195 | pr_info("%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
| 196 | tsk->comm, tsk->pid, str, |
| 197 | regs->ip, regs->sp, error_code); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 198 | print_vma_addr(" in ", regs->ip); |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 199 | pr_cont("\n"); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 200 | } |
| 201 | #endif |
| 202 | |
Oleg Nesterov | 38cad57 | 2014-05-07 16:47:09 +0200 | [diff] [blame] | 203 | force_sig_info(signr, info ?: SEND_SIG_PRIV, tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 205 | NOKPROBE_SYMBOL(do_trap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Oleg Nesterov | dff0796 | 2014-05-07 17:21:34 +0200 | [diff] [blame] | 207 | static void do_error_trap(struct pt_regs *regs, long error_code, char *str, |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 208 | unsigned long trapnr, int signr) |
Oleg Nesterov | dff0796 | 2014-05-07 17:21:34 +0200 | [diff] [blame] | 209 | { |
| 210 | enum ctx_state prev_state = exception_enter(); |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 211 | siginfo_t info; |
Oleg Nesterov | dff0796 | 2014-05-07 17:21:34 +0200 | [diff] [blame] | 212 | |
| 213 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) != |
| 214 | NOTIFY_STOP) { |
| 215 | conditional_sti(regs); |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 216 | do_trap(trapnr, signr, str, regs, error_code, |
| 217 | fill_trap_info(regs, signr, trapnr, &info)); |
Oleg Nesterov | dff0796 | 2014-05-07 17:21:34 +0200 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | exception_exit(prev_state); |
| 221 | } |
| 222 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 223 | #define DO_ERROR(trapnr, signr, str, name) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 224 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 225 | { \ |
Oleg Nesterov | 1c326c4 | 2014-05-08 20:04:11 +0200 | [diff] [blame] | 226 | do_error_trap(regs, error_code, str, trapnr, signr); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | } |
| 228 | |
Oleg Nesterov | 0eb1483 | 2014-05-08 20:12:24 +0200 | [diff] [blame] | 229 | DO_ERROR(X86_TRAP_DE, SIGFPE, "divide error", divide_error) |
| 230 | DO_ERROR(X86_TRAP_OF, SIGSEGV, "overflow", overflow) |
| 231 | DO_ERROR(X86_TRAP_BR, SIGSEGV, "bounds", bounds) |
| 232 | DO_ERROR(X86_TRAP_UD, SIGILL, "invalid opcode", invalid_op) |
| 233 | DO_ERROR(X86_TRAP_OLD_MF, SIGFPE, "coprocessor segment overrun",coprocessor_segment_overrun) |
| 234 | DO_ERROR(X86_TRAP_TS, SIGSEGV, "invalid TSS", invalid_TSS) |
| 235 | DO_ERROR(X86_TRAP_NP, SIGBUS, "segment not present", segment_not_present) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 236 | #ifdef CONFIG_X86_32 |
Oleg Nesterov | 0eb1483 | 2014-05-08 20:12:24 +0200 | [diff] [blame] | 237 | DO_ERROR(X86_TRAP_SS, SIGBUS, "stack segment", stack_segment) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 238 | #endif |
Oleg Nesterov | 0eb1483 | 2014-05-08 20:12:24 +0200 | [diff] [blame] | 239 | DO_ERROR(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 241 | #ifdef CONFIG_X86_64 |
| 242 | /* Runs on IST stack */ |
| 243 | dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code) |
| 244 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 245 | enum ctx_state prev_state; |
| 246 | |
| 247 | prev_state = exception_enter(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 248 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 249 | X86_TRAP_SS, SIGBUS) != NOTIFY_STOP) { |
| 250 | preempt_conditional_sti(regs); |
| 251 | do_trap(X86_TRAP_SS, SIGBUS, "stack segment", regs, error_code, NULL); |
| 252 | preempt_conditional_cli(regs); |
| 253 | } |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 254 | exception_exit(prev_state); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 255 | } |
| 256 | |
| 257 | dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) |
| 258 | { |
| 259 | static const char str[] = "double fault"; |
| 260 | struct task_struct *tsk = current; |
| 261 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 262 | exception_enter(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 263 | /* Return not checked because double check cannot be ignored */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 264 | notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_DF, SIGSEGV); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 265 | |
| 266 | tsk->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 267 | tsk->thread.trap_nr = X86_TRAP_DF; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 268 | |
Borislav Petkov | 4d067d8 | 2013-05-09 12:02:29 +0200 | [diff] [blame] | 269 | #ifdef CONFIG_DOUBLEFAULT |
| 270 | df_debug(regs, error_code); |
| 271 | #endif |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 272 | /* |
| 273 | * This is always a kernel trap and never fixable (and thus must |
| 274 | * never return). |
| 275 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 276 | for (;;) |
| 277 | die(str, regs, error_code); |
| 278 | } |
| 279 | #endif |
| 280 | |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 281 | dotraplinkage void |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 282 | do_general_protection(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | { |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 284 | struct task_struct *tsk; |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 285 | enum ctx_state prev_state; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 286 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 287 | prev_state = exception_enter(); |
Alexander van Heukelum | c6df0d7 | 2008-09-09 21:56:07 +0200 | [diff] [blame] | 288 | conditional_sti(regs); |
| 289 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 290 | #ifdef CONFIG_X86_32 |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 291 | if (regs->flags & X86_VM_MASK) { |
| 292 | local_irq_enable(); |
| 293 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 294 | goto exit; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 295 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 296 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 298 | tsk = current; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 299 | if (!user_mode(regs)) { |
| 300 | if (fixup_exception(regs)) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 301 | goto exit; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 302 | |
| 303 | tsk->thread.error_code = error_code; |
| 304 | tsk->thread.trap_nr = X86_TRAP_GP; |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 305 | if (notify_die(DIE_GPF, "general protection fault", regs, error_code, |
| 306 | X86_TRAP_GP, SIGSEGV) != NOTIFY_STOP) |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 307 | die("general protection fault", regs, error_code); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 308 | goto exit; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 309 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 311 | tsk->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 312 | tsk->thread.trap_nr = X86_TRAP_GP; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 313 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 314 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
| 315 | printk_ratelimit()) { |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 316 | pr_info("%s[%d] general protection ip:%lx sp:%lx error:%lx", |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 317 | tsk->comm, task_pid_nr(tsk), |
| 318 | regs->ip, regs->sp, error_code); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 319 | print_vma_addr(" in ", regs->ip); |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 320 | pr_cont("\n"); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 321 | } |
Masoud Asgharifard Sharbiani | abd4f75 | 2007-07-22 11:12:28 +0200 | [diff] [blame] | 322 | |
Oleg Nesterov | 38cad57 | 2014-05-07 16:47:09 +0200 | [diff] [blame] | 323 | force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 324 | exit: |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 325 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | } |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 327 | NOKPROBE_SYMBOL(do_general_protection); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 329 | /* May run on IST stack. */ |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 330 | dotraplinkage void notrace do_int3(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 332 | enum ctx_state prev_state; |
| 333 | |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 334 | #ifdef CONFIG_DYNAMIC_FTRACE |
Steven Rostedt | a192cd0 | 2012-05-30 13:26:37 -0400 | [diff] [blame] | 335 | /* |
| 336 | * ftrace must be first, everything else may cause a recursive crash. |
| 337 | * See note by declaration of modifying_ftrace_code in ftrace.c |
| 338 | */ |
| 339 | if (unlikely(atomic_read(&modifying_ftrace_code)) && |
| 340 | ftrace_int3_handler(regs)) |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 341 | return; |
| 342 | #endif |
Jiri Kosina | 17f4157 | 2013-07-23 10:09:28 +0200 | [diff] [blame] | 343 | if (poke_int3_handler(regs)) |
| 344 | return; |
| 345 | |
Masami Hiramatsu | 4cdf77a | 2014-06-14 06:47:12 +0000 | [diff] [blame^] | 346 | prev_state = exception_enter(); |
Jason Wessel | f503b5a | 2010-05-20 21:04:25 -0500 | [diff] [blame] | 347 | #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 348 | if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP, |
| 349 | SIGTRAP) == NOTIFY_STOP) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 350 | goto exit; |
Jason Wessel | f503b5a | 2010-05-20 21:04:25 -0500 | [diff] [blame] | 351 | #endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */ |
Srikar Dronamraju | cc3a1bf | 2011-10-25 19:51:59 +0530 | [diff] [blame] | 352 | |
Masami Hiramatsu | 6f6343f | 2014-04-17 17:17:33 +0900 | [diff] [blame] | 353 | #ifdef CONFIG_KPROBES |
| 354 | if (kprobe_int3_handler(regs)) |
Masami Hiramatsu | 4cdf77a | 2014-06-14 06:47:12 +0000 | [diff] [blame^] | 355 | goto exit; |
Masami Hiramatsu | 6f6343f | 2014-04-17 17:17:33 +0900 | [diff] [blame] | 356 | #endif |
| 357 | |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 358 | if (notify_die(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP, |
| 359 | SIGTRAP) == NOTIFY_STOP) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 360 | goto exit; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 361 | |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 362 | /* |
| 363 | * Let others (NMI) know that the debug stack is in use |
| 364 | * as we may switch to the interrupt stack. |
| 365 | */ |
| 366 | debug_stack_usage_inc(); |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 367 | preempt_conditional_sti(regs); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 368 | do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL); |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 369 | preempt_conditional_cli(regs); |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 370 | debug_stack_usage_dec(); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 371 | exit: |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 372 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 374 | NOKPROBE_SYMBOL(do_int3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 376 | #ifdef CONFIG_X86_64 |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 377 | /* |
| 378 | * Help handler running on IST stack to switch back to user stack |
| 379 | * for scheduling or signal handling. The actual stack switch is done in |
| 380 | * entry.S |
| 381 | */ |
Ingo Molnar | ec00010 | 2014-06-06 07:55:06 +0200 | [diff] [blame] | 382 | asmlinkage __visible struct pt_regs *sync_regs(struct pt_regs *eregs) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 383 | { |
| 384 | struct pt_regs *regs = eregs; |
| 385 | /* Did already sync */ |
| 386 | if (eregs == (struct pt_regs *)eregs->sp) |
| 387 | ; |
| 388 | /* Exception from user space */ |
| 389 | else if (user_mode(eregs)) |
| 390 | regs = task_pt_regs(current); |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 391 | /* |
| 392 | * Exception from kernel and interrupts are enabled. Move to |
| 393 | * kernel process stack. |
| 394 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 395 | else if (eregs->flags & X86_EFLAGS_IF) |
| 396 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); |
| 397 | if (eregs != regs) |
| 398 | *regs = *eregs; |
| 399 | return regs; |
| 400 | } |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 401 | NOKPROBE_SYMBOL(sync_regs); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 402 | #endif |
| 403 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | /* |
| 405 | * Our handling of the processor debug registers is non-trivial. |
| 406 | * We do not clear them on entry and exit from the kernel. Therefore |
| 407 | * it is possible to get a watchpoint trap here from inside the kernel. |
| 408 | * However, the code in ./ptrace.c has ensured that the user can |
| 409 | * only set watchpoints on userspace addresses. Therefore the in-kernel |
| 410 | * watchpoint trap can only occur in code which is reading/writing |
| 411 | * from user space. Such code must not hold kernel locks (since it |
| 412 | * can equally take a page fault), therefore it is safe to call |
| 413 | * force_sig_info even though that claims and releases locks. |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 414 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | * Code in ./signal.c ensures that the debug control register |
| 416 | * is restored before we deliver any signal, and therefore that |
| 417 | * user code runs with the correct debug control register even though |
| 418 | * we clear it here. |
| 419 | * |
| 420 | * Being careful here means that we don't have to be as careful in a |
| 421 | * lot of more complicated places (task switching can be a bit lazy |
| 422 | * about restoring all the debug state, and ptrace doesn't have to |
| 423 | * find every occurrence of the TF bit that could be saved away even |
| 424 | * by user code) |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 425 | * |
| 426 | * May run on IST stack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | */ |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 428 | dotraplinkage void do_debug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | struct task_struct *tsk = current; |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 431 | enum ctx_state prev_state; |
Frederic Weisbecker | a1e80fa | 2010-06-30 15:09:06 +0200 | [diff] [blame] | 432 | int user_icebp = 0; |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 433 | unsigned long dr6; |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 434 | int si_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
Masami Hiramatsu | 4cdf77a | 2014-06-14 06:47:12 +0000 | [diff] [blame^] | 436 | prev_state = exception_enter(); |
| 437 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 438 | get_debugreg(dr6, 6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
K.Prasad | 40f9249 | 2010-01-28 16:44:01 +0530 | [diff] [blame] | 440 | /* Filter out all the reserved bits which are preset to 1 */ |
| 441 | dr6 &= ~DR6_RESERVED; |
| 442 | |
Frederic Weisbecker | a1e80fa | 2010-06-30 15:09:06 +0200 | [diff] [blame] | 443 | /* |
| 444 | * If dr6 has no reason to give us about the origin of this trap, |
| 445 | * then it's very likely the result of an icebp/int01 trap. |
| 446 | * User wants a sigtrap for that. |
| 447 | */ |
| 448 | if (!dr6 && user_mode(regs)) |
| 449 | user_icebp = 1; |
| 450 | |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 451 | /* Catch kmemcheck conditions first of all! */ |
Ingo Molnar | eadb8a0 | 2009-06-17 12:52:15 +0200 | [diff] [blame] | 452 | if ((dr6 & DR_STEP) && kmemcheck_trap(regs)) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 453 | goto exit; |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 454 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 455 | /* DR6 may or may not be cleared by the CPU */ |
| 456 | set_debugreg(0, 6); |
Roland McGrath | 10faa81 | 2008-01-30 13:30:54 +0100 | [diff] [blame] | 457 | |
Peter Zijlstra | ea8e61b | 2010-03-25 14:51:51 +0100 | [diff] [blame] | 458 | /* |
| 459 | * The processor cleared BTF, so don't mark that we need it set. |
| 460 | */ |
| 461 | clear_tsk_thread_flag(tsk, TIF_BLOCKSTEP); |
| 462 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 463 | /* Store the virtualized DR6 value */ |
| 464 | tsk->thread.debugreg6 = dr6; |
| 465 | |
Masami Hiramatsu | 6f6343f | 2014-04-17 17:17:33 +0900 | [diff] [blame] | 466 | #ifdef CONFIG_KPROBES |
| 467 | if (kprobe_debug_handler(regs)) |
| 468 | goto exit; |
| 469 | #endif |
| 470 | |
Rusty Russell | 5a802e1 | 2013-06-16 14:12:47 +0930 | [diff] [blame] | 471 | if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, error_code, |
K.Prasad | 62edab9 | 2009-06-01 23:47:06 +0530 | [diff] [blame] | 472 | SIGTRAP) == NOTIFY_STOP) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 473 | goto exit; |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 474 | |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 475 | /* |
| 476 | * Let others (NMI) know that the debug stack is in use |
| 477 | * as we may switch to the interrupt stack. |
| 478 | */ |
| 479 | debug_stack_usage_inc(); |
| 480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | /* 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] | 482 | preempt_conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 484 | if (regs->flags & X86_VM_MASK) { |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 485 | handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, |
| 486 | X86_TRAP_DB); |
Bart Oldeman | 6554287 | 2010-09-23 13:16:58 -0400 | [diff] [blame] | 487 | preempt_conditional_cli(regs); |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 488 | debug_stack_usage_dec(); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 489 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | /* |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 493 | * Single-stepping through system calls: ignore any exceptions in |
| 494 | * kernel space, but re-enable TF when returning to user mode. |
| 495 | * |
| 496 | * We already checked v86 mode above, so we can check for kernel mode |
| 497 | * by just checking the CPL of CS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | */ |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 499 | if ((dr6 & DR_STEP) && !user_mode(regs)) { |
| 500 | tsk->thread.debugreg6 &= ~DR_STEP; |
| 501 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
| 502 | regs->flags &= ~X86_EFLAGS_TF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 504 | si_code = get_si_code(tsk->thread.debugreg6); |
Frederic Weisbecker | a1e80fa | 2010-06-30 15:09:06 +0200 | [diff] [blame] | 505 | if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp) |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 506 | send_sigtrap(tsk, regs, error_code, si_code); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 507 | preempt_conditional_cli(regs); |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 508 | debug_stack_usage_dec(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 510 | exit: |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 511 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | } |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 513 | NOKPROBE_SYMBOL(do_debug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
| 515 | /* |
| 516 | * Note that we play around with the 'TS' bit in an attempt to get |
| 517 | * the correct behaviour even in the presence of the asynchronous |
| 518 | * IRQ13 behaviour |
| 519 | */ |
Oleg Nesterov | 5e1b05b | 2014-05-08 20:34:00 +0200 | [diff] [blame] | 520 | static void math_error(struct pt_regs *regs, int error_code, int trapnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | { |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame] | 522 | struct task_struct *task = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | siginfo_t info; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 524 | unsigned short err; |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 525 | char *str = (trapnr == X86_TRAP_MF) ? "fpu exception" : |
| 526 | "simd exception"; |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame] | 527 | |
| 528 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, SIGFPE) == NOTIFY_STOP) |
| 529 | return; |
| 530 | conditional_sti(regs); |
| 531 | |
| 532 | if (!user_mode_vm(regs)) |
| 533 | { |
| 534 | if (!fixup_exception(regs)) { |
| 535 | task->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 536 | task->thread.trap_nr = trapnr; |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame] | 537 | die(str, regs, error_code); |
| 538 | } |
| 539 | return; |
| 540 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
| 542 | /* |
| 543 | * Save the info for the exception handler and clear the error. |
| 544 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | save_init_fpu(task); |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 546 | task->thread.trap_nr = trapnr; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 547 | task->thread.error_code = error_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | info.si_signo = SIGFPE; |
| 549 | info.si_errno = 0; |
Oleg Nesterov | b02ef20 | 2014-05-12 18:24:45 +0200 | [diff] [blame] | 550 | info.si_addr = (void __user *)uprobe_get_trap_addr(regs); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 551 | if (trapnr == X86_TRAP_MF) { |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 552 | unsigned short cwd, swd; |
| 553 | /* |
| 554 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 555 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 556 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 557 | * fault bit. We should only be taking one exception at a time, |
| 558 | * so if this combination doesn't produce any single exception, |
| 559 | * then we have a bad program that isn't synchronizing its FPU usage |
| 560 | * and it will suffer the consequences since we won't be able to |
| 561 | * fully reproduce the context of the exception |
| 562 | */ |
| 563 | cwd = get_fpu_cwd(task); |
| 564 | swd = get_fpu_swd(task); |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 565 | |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 566 | err = swd & ~cwd; |
| 567 | } else { |
| 568 | /* |
| 569 | * The SIMD FPU exceptions are handled a little differently, as there |
| 570 | * is only a single status/control register. Thus, to determine which |
| 571 | * unmasked exception was caught we must mask the exception mask bits |
| 572 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 573 | */ |
| 574 | unsigned short mxcsr = get_fpu_mxcsr(task); |
| 575 | err = ~(mxcsr >> 7) & mxcsr; |
| 576 | } |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 577 | |
| 578 | if (err & 0x001) { /* Invalid op */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 579 | /* |
| 580 | * swd & 0x240 == 0x040: Stack Underflow |
| 581 | * swd & 0x240 == 0x240: Stack Overflow |
| 582 | * User must clear the SF bit (0x40) if set |
| 583 | */ |
| 584 | info.si_code = FPE_FLTINV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 585 | } else if (err & 0x004) { /* Divide by Zero */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 586 | info.si_code = FPE_FLTDIV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 587 | } else if (err & 0x008) { /* Overflow */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 588 | info.si_code = FPE_FLTOVF; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 589 | } else if (err & 0x012) { /* Denormal, Underflow */ |
| 590 | info.si_code = FPE_FLTUND; |
| 591 | } else if (err & 0x020) { /* Precision */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 592 | info.si_code = FPE_FLTRES; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 593 | } else { |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 594 | /* |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 595 | * If we're using IRQ 13, or supposedly even some trap |
| 596 | * X86_TRAP_MF implementations, it's possible |
| 597 | * we get a spurious trap, which is not an error. |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 598 | */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 599 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | } |
| 601 | force_sig_info(SIGFPE, &info, task); |
| 602 | } |
| 603 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 604 | dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 606 | enum ctx_state prev_state; |
| 607 | |
| 608 | prev_state = exception_enter(); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 609 | math_error(regs, error_code, X86_TRAP_MF); |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 610 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | } |
| 612 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 613 | dotraplinkage void |
| 614 | do_simd_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 616 | enum ctx_state prev_state; |
| 617 | |
| 618 | prev_state = exception_enter(); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 619 | math_error(regs, error_code, X86_TRAP_XF); |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 620 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | } |
| 622 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 623 | dotraplinkage void |
| 624 | do_spurious_interrupt_bug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
Alexander van Heukelum | cf81978 | 2008-09-09 21:56:08 +0200 | [diff] [blame] | 626 | conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | #if 0 |
| 628 | /* No need to warn about this any longer. */ |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 629 | pr_info("Ignoring P6 Local APIC Spurious Interrupt Bug...\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | #endif |
| 631 | } |
| 632 | |
Andi Kleen | 2605fc2 | 2014-05-02 00:44:37 +0200 | [diff] [blame] | 633 | asmlinkage __visible void __attribute__((weak)) smp_thermal_interrupt(void) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 634 | { |
| 635 | } |
| 636 | |
Andi Kleen | 2605fc2 | 2014-05-02 00:44:37 +0200 | [diff] [blame] | 637 | asmlinkage __visible void __attribute__((weak)) smp_threshold_interrupt(void) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 638 | { |
| 639 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
| 641 | /* |
Linus Torvalds | 34ddc81 | 2012-02-18 12:56:35 -0800 | [diff] [blame] | 642 | * 'math_state_restore()' saves the current math information in the |
| 643 | * old math state array, and gets the new ones from the current task |
| 644 | * |
| 645 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 646 | * Don't touch unless you *really* know how it works. |
| 647 | * |
| 648 | * Must be called with kernel preemption disabled (eg with local |
| 649 | * local interrupts as in the case of do_device_not_available). |
| 650 | */ |
| 651 | void math_state_restore(void) |
| 652 | { |
| 653 | struct task_struct *tsk = current; |
| 654 | |
| 655 | if (!tsk_used_math(tsk)) { |
| 656 | local_irq_enable(); |
| 657 | /* |
| 658 | * does a slab alloc which can sleep |
| 659 | */ |
| 660 | if (init_fpu(tsk)) { |
| 661 | /* |
| 662 | * ran out of memory! |
| 663 | */ |
| 664 | do_group_exit(SIGKILL); |
| 665 | return; |
| 666 | } |
| 667 | local_irq_disable(); |
| 668 | } |
| 669 | |
| 670 | __thread_fpu_begin(tsk); |
Suresh Siddha | 304bced | 2012-08-24 14:13:02 -0700 | [diff] [blame] | 671 | |
Linus Torvalds | 80ab6f1 | 2012-02-19 11:48:44 -0800 | [diff] [blame] | 672 | /* |
| 673 | * Paranoid restore. send a SIGSEGV if we fail to restore the state. |
| 674 | */ |
| 675 | if (unlikely(restore_fpu_checking(tsk))) { |
Suresh Siddha | 304bced | 2012-08-24 14:13:02 -0700 | [diff] [blame] | 676 | drop_init_fpu(tsk); |
Oleg Nesterov | 38cad57 | 2014-05-07 16:47:09 +0200 | [diff] [blame] | 677 | force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk); |
Linus Torvalds | 80ab6f1 | 2012-02-19 11:48:44 -0800 | [diff] [blame] | 678 | return; |
| 679 | } |
Linus Torvalds | b3b0870 | 2012-02-16 15:45:23 -0800 | [diff] [blame] | 680 | |
Vineet Gupta | c375f15 | 2013-11-12 15:08:46 -0800 | [diff] [blame] | 681 | tsk->thread.fpu_counter++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | } |
Rusty Russell | 5992b6d | 2007-07-19 01:49:21 -0700 | [diff] [blame] | 683 | EXPORT_SYMBOL_GPL(math_state_restore); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 685 | dotraplinkage void |
Brian Gerst | aa78bcf | 2009-02-10 09:51:45 -0500 | [diff] [blame] | 686 | do_device_not_available(struct pt_regs *regs, long error_code) |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 687 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 688 | enum ctx_state prev_state; |
| 689 | |
| 690 | prev_state = exception_enter(); |
Suresh Siddha | 5d2bd70 | 2012-09-06 14:58:52 -0700 | [diff] [blame] | 691 | BUG_ON(use_eager_fpu()); |
Suresh Siddha | 304bced | 2012-08-24 14:13:02 -0700 | [diff] [blame] | 692 | |
Brian Gerst | a334fe4 | 2010-09-03 21:17:15 -0400 | [diff] [blame] | 693 | #ifdef CONFIG_MATH_EMULATION |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 694 | if (read_cr0() & X86_CR0_EM) { |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 695 | struct math_emu_info info = { }; |
| 696 | |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 697 | conditional_sti(regs); |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 698 | |
Brian Gerst | aa78bcf | 2009-02-10 09:51:45 -0500 | [diff] [blame] | 699 | info.regs = regs; |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 700 | math_emulate(&info); |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 701 | exception_exit(prev_state); |
Brian Gerst | a334fe4 | 2010-09-03 21:17:15 -0400 | [diff] [blame] | 702 | return; |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 703 | } |
Brian Gerst | a334fe4 | 2010-09-03 21:17:15 -0400 | [diff] [blame] | 704 | #endif |
| 705 | math_state_restore(); /* interrupts still off */ |
| 706 | #ifdef CONFIG_X86_32 |
| 707 | conditional_sti(regs); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 708 | #endif |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 709 | exception_exit(prev_state); |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 710 | } |
Masami Hiramatsu | 9326638 | 2014-04-17 17:18:14 +0900 | [diff] [blame] | 711 | NOKPROBE_SYMBOL(do_device_not_available); |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 712 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 713 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 714 | 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] | 715 | { |
| 716 | siginfo_t info; |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 717 | enum ctx_state prev_state; |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 718 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 719 | prev_state = exception_enter(); |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 720 | local_irq_enable(); |
| 721 | |
| 722 | info.si_signo = SIGILL; |
| 723 | info.si_errno = 0; |
| 724 | info.si_code = ILL_BADSTK; |
Hannes Eder | fc6fcdf | 2009-02-22 01:00:57 +0100 | [diff] [blame] | 725 | info.si_addr = NULL; |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 726 | if (notify_die(DIE_TRAP, "iret exception", regs, error_code, |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 727 | X86_TRAP_IRET, SIGILL) != NOTIFY_STOP) { |
| 728 | do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code, |
| 729 | &info); |
| 730 | } |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 731 | exception_exit(prev_state); |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 732 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 733 | #endif |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 734 | |
Jan Kiszka | 29c8439 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 735 | /* Set of traps needed for early debugging. */ |
| 736 | void __init early_trap_init(void) |
| 737 | { |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 738 | set_intr_gate_ist(X86_TRAP_DB, &debug, DEBUG_STACK); |
Jan Kiszka | 29c8439 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 739 | /* int3 can be called from all */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 740 | set_system_intr_gate_ist(X86_TRAP_BP, &int3, DEBUG_STACK); |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 741 | #ifdef CONFIG_X86_32 |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 742 | set_intr_gate(X86_TRAP_PF, page_fault); |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 743 | #endif |
Jan Kiszka | 29c8439 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 744 | load_idt(&idt_descr); |
| 745 | } |
| 746 | |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 747 | void __init early_trap_pf_init(void) |
| 748 | { |
| 749 | #ifdef CONFIG_X86_64 |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 750 | set_intr_gate(X86_TRAP_PF, page_fault); |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 751 | #endif |
| 752 | } |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | void __init trap_init(void) |
| 755 | { |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 756 | int i; |
| 757 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | #ifdef CONFIG_EISA |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 759 | void __iomem *p = early_ioremap(0x0FFFD9, 4); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 760 | |
| 761 | if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | EISA_bus = 1; |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 763 | early_iounmap(p, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | #endif |
| 765 | |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 766 | set_intr_gate(X86_TRAP_DE, divide_error); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 767 | set_intr_gate_ist(X86_TRAP_NMI, &nmi, NMI_STACK); |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 768 | /* int4 can be called from all */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 769 | set_system_intr_gate(X86_TRAP_OF, &overflow); |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 770 | set_intr_gate(X86_TRAP_BR, bounds); |
| 771 | set_intr_gate(X86_TRAP_UD, invalid_op); |
| 772 | set_intr_gate(X86_TRAP_NM, device_not_available); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 773 | #ifdef CONFIG_X86_32 |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 774 | set_task_gate(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 775 | #else |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 776 | set_intr_gate_ist(X86_TRAP_DF, &double_fault, DOUBLEFAULT_STACK); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 777 | #endif |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 778 | set_intr_gate(X86_TRAP_OLD_MF, coprocessor_segment_overrun); |
| 779 | set_intr_gate(X86_TRAP_TS, invalid_TSS); |
| 780 | set_intr_gate(X86_TRAP_NP, segment_not_present); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 781 | set_intr_gate_ist(X86_TRAP_SS, &stack_segment, STACKFAULT_STACK); |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 782 | set_intr_gate(X86_TRAP_GP, general_protection); |
| 783 | set_intr_gate(X86_TRAP_SPURIOUS, spurious_interrupt_bug); |
| 784 | set_intr_gate(X86_TRAP_MF, coprocessor_error); |
| 785 | set_intr_gate(X86_TRAP_AC, alignment_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | #ifdef CONFIG_X86_MCE |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 787 | set_intr_gate_ist(X86_TRAP_MC, &machine_check, MCE_STACK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | #endif |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 789 | set_intr_gate(X86_TRAP_XF, simd_coprocessor_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 791 | /* Reserve all the builtin and the syscall vector: */ |
| 792 | for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) |
| 793 | set_bit(i, used_vectors); |
| 794 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 795 | #ifdef CONFIG_IA32_EMULATION |
| 796 | set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall); |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 797 | set_bit(IA32_SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 798 | #endif |
| 799 | |
| 800 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 801 | set_system_trap_gate(SYSCALL_VECTOR, &system_call); |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 802 | set_bit(SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 803 | #endif |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 804 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 805 | /* |
Kees Cook | 4eefbe7 | 2013-04-10 12:24:22 -0700 | [diff] [blame] | 806 | * Set the IDT descriptor to a fixed read-only location, so that the |
| 807 | * "sidt" instruction will not leak the location of the kernel, and |
| 808 | * to defend the IDT against arbitrary memory write vulnerabilities. |
| 809 | * It will be reloaded in cpu_init() */ |
| 810 | __set_fixmap(FIX_RO_IDT, __pa_symbol(idt_table), PAGE_KERNEL_RO); |
| 811 | idt_descr.address = fix_to_virt(FIX_RO_IDT); |
| 812 | |
| 813 | /* |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 814 | * Should be a barrier for any external CPU state: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | */ |
| 816 | cpu_init(); |
| 817 | |
Thomas Gleixner | 428cf90 | 2009-08-20 10:35:46 +0200 | [diff] [blame] | 818 | x86_init.irqs.trap_init(); |
Steven Rostedt | 228bdaa | 2011-12-09 03:02:19 -0500 | [diff] [blame] | 819 | |
| 820 | #ifdef CONFIG_X86_64 |
Seiji Aguchi | 629f4f9 | 2013-06-20 11:45:44 -0400 | [diff] [blame] | 821 | memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 822 | set_nmi_gate(X86_TRAP_DB, &debug); |
| 823 | set_nmi_gate(X86_TRAP_BP, &int3); |
Steven Rostedt | 228bdaa | 2011-12-09 03:02:19 -0500 | [diff] [blame] | 824 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |