blob: ab8dad719b9e8d7cc368c62646cd811ce5a3f167 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * Copyright (C) 1991, 1992 Linus Torvalds
Alexander van Heukeluma8c1be92008-07-02 01:29:44 +02003 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
5 * Pentium III FXSR, SSE support
6 * Gareth Hughes <gareth@valinux.com>, May 2000
7 */
8
9/*
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +020010 * Handle hardware traps and faults.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
Joe Perchesc767a542012-05-21 19:50:07 -070012
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
Frederic Weisbecker56dd9472013-02-24 00:23:25 +010015#include <linux/context_tracking.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/interrupt.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/kallsyms.h>
Ingo Molnarb5964402008-02-26 11:15:50 +010018#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/kprobes.h>
Andrew Morton1e2af922006-09-27 01:51:15 -070020#include <linux/uaccess.h>
Ingo Molnarb5964402008-02-26 11:15:50 +010021#include <linux/kdebug.h>
Jason Wesself503b5a2010-05-20 21:04:25 -050022#include <linux/kgdb.h>
Ingo Molnarb5964402008-02-26 11:15:50 +010023#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/ptrace.h>
26#include <linux/string.h>
Ingo Molnarb5964402008-02-26 11:15:50 +010027#include <linux/delay.h>
28#include <linux/errno.h>
29#include <linux/kexec.h>
30#include <linux/sched.h>
31#include <linux/timer.h>
32#include <linux/init.h>
Jeremy Fitzhardinge91768d62006-12-08 02:36:21 -080033#include <linux/bug.h>
Ingo Molnarb5964402008-02-26 11:15:50 +010034#include <linux/nmi.h>
35#include <linux/mm.h>
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +020036#include <linux/smp.h>
37#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#ifdef CONFIG_EISA
40#include <linux/ioport.h>
41#include <linux/eisa.h>
42#endif
43
Dave Jiangc0d12172007-07-19 01:49:46 -070044#if defined(CONFIG_EDAC)
45#include <linux/edac.h>
46#endif
47
Vegard Nossumf8561292008-04-04 00:53:23 +020048#include <asm/kmemcheck.h>
Ingo Molnarb5964402008-02-26 11:15:50 +010049#include <asm/stacktrace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <asm/processor.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <asm/debugreg.h>
Arun Sharma600634972011-07-26 16:09:06 -070052#include <linux/atomic.h>
Steven Rostedt08d636b2011-08-16 09:57:10 -040053#include <asm/ftrace.h>
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +020054#include <asm/traps.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#include <asm/desc.h>
56#include <asm/i387.h>
Linus Torvalds1361b832012-02-21 13:19:22 -080057#include <asm/fpu-internal.h>
Hidetoshi Seto9e55e442009-06-15 17:22:15 +090058#include <asm/mce.h>
Kees Cook4eefbe72013-04-10 12:24:22 -070059#include <asm/fixmap.h>
Ingo Molnar1164dd02009-01-28 19:34:09 +010060#include <asm/mach_traps.h>
Jiri Kosina17f41572013-07-23 10:09:28 +020061#include <asm/alternative.h>
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +020062
Alexander van Heukelum081f75b2008-10-03 22:00:39 +020063#ifdef CONFIG_X86_64
Thomas Gleixner428cf902009-08-20 10:35:46 +020064#include <asm/x86_init.h>
Alexander van Heukelum081f75b2008-10-03 22:00:39 +020065#include <asm/pgalloc.h>
66#include <asm/proto.h>
Kees Cook4df05f32013-07-16 11:34:41 -070067
68/* No need to be aligned, but done to keep all IDTs defined the same way. */
69gate_desc debug_idt_table[NR_VECTORS] __page_aligned_bss;
Alexander van Heukelum081f75b2008-10-03 22:00:39 +020070#else
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +020071#include <asm/processor-flags.h>
Ingo Molnar8e6dafd2009-02-23 00:34:39 +010072#include <asm/setup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Linus Torvalds1da177e2005-04-16 15:20:36 -070074asmlinkage int system_call(void);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +020075#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Kees Cook4df05f32013-07-16 11:34:41 -070077/* Must be page-aligned because the real IDT is used in a fixmap. */
78gate_desc idt_table[NR_VECTORS] __page_aligned_bss;
79
Yinghai Lub77b8812008-12-19 15:23:44 -080080DECLARE_BITMAP(used_vectors, NR_VECTORS);
81EXPORT_SYMBOL_GPL(used_vectors);
82
Alexander van Heukelum762db432008-09-09 21:55:55 +020083static inline void conditional_sti(struct pt_regs *regs)
84{
85 if (regs->flags & X86_EFLAGS_IF)
86 local_irq_enable();
87}
88
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +020089static inline void preempt_conditional_sti(struct pt_regs *regs)
90{
Peter Zijlstrabdb43802013-09-10 12:15:23 +020091 preempt_count_inc();
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +020092 if (regs->flags & X86_EFLAGS_IF)
93 local_irq_enable();
94}
95
Thomas Gleixnerbe716612009-01-13 23:36:34 +010096static inline void conditional_cli(struct pt_regs *regs)
97{
98 if (regs->flags & X86_EFLAGS_IF)
99 local_irq_disable();
100}
101
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +0200102static inline void preempt_conditional_cli(struct pt_regs *regs)
103{
104 if (regs->flags & X86_EFLAGS_IF)
105 local_irq_disable();
Peter Zijlstrabdb43802013-09-10 12:15:23 +0200106 preempt_count_dec();
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +0200107}
108
Frederic Weisbeckerc416ddf2012-09-25 14:51:19 +0200109static int __kprobes
110do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str,
111 struct pt_regs *regs, long error_code)
112{
113#ifdef CONFIG_X86_32
114 if (regs->flags & X86_VM_MASK) {
115 /*
116 * Traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
117 * On nmi (interrupt 2), do_trap should not be called.
118 */
119 if (trapnr < X86_TRAP_UD) {
120 if (!handle_vm86_trap((struct kernel_vm86_regs *) regs,
121 error_code, trapnr))
122 return 0;
123 }
124 return -1;
125 }
126#endif
127 if (!user_mode(regs)) {
128 if (!fixup_exception(regs)) {
129 tsk->thread.error_code = error_code;
130 tsk->thread.trap_nr = trapnr;
131 die(str, regs, error_code);
132 }
133 return 0;
134 }
135
136 return -1;
137}
138
Ingo Molnarb5964402008-02-26 11:15:50 +0100139static void __kprobes
Alexander van Heukelum3c1326f2008-09-26 14:03:08 +0200140do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
Ingo Molnarb5964402008-02-26 11:15:50 +0100141 long error_code, siginfo_t *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Alexander Nyberg4f339ec2005-06-25 14:58:27 -0700143 struct task_struct *tsk = current;
Alexander Nyberg4f339ec2005-06-25 14:58:27 -0700144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Frederic Weisbeckerc416ddf2012-09-25 14:51:19 +0200146 if (!do_trap_no_signal(tsk, trapnr, str, regs, error_code))
147 return;
Ingo Molnarb5964402008-02-26 11:15:50 +0100148 /*
Srikar Dronamraju51e7dc72012-03-12 14:55:55 +0530149 * We want error_code and trap_nr set for userspace faults and
Ingo Molnarb5964402008-02-26 11:15:50 +0100150 * kernelspace faults which result in die(), but not
151 * kernelspace faults which are fixed up. die() gives the
152 * process no chance to handle the signal and notice the
153 * kernel fault information, so that won't result in polluting
154 * the information about previously queued, but not yet
155 * delivered, faults. See also do_general_protection below.
156 */
157 tsk->thread.error_code = error_code;
Srikar Dronamraju51e7dc72012-03-12 14:55:55 +0530158 tsk->thread.trap_nr = trapnr;
Ingo Molnarb5964402008-02-26 11:15:50 +0100159
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200160#ifdef CONFIG_X86_64
161 if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
162 printk_ratelimit()) {
Joe Perchesc767a542012-05-21 19:50:07 -0700163 pr_info("%s[%d] trap %s ip:%lx sp:%lx error:%lx",
164 tsk->comm, tsk->pid, str,
165 regs->ip, regs->sp, error_code);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200166 print_vma_addr(" in ", regs->ip);
Joe Perchesc767a542012-05-21 19:50:07 -0700167 pr_cont("\n");
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200168 }
169#endif
170
Oleg Nesterov38cad572014-05-07 16:47:09 +0200171 force_sig_info(signr, info ?: SEND_SIG_PRIV, tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
Oleg Nesterovdff07962014-05-07 17:21:34 +0200174static void do_error_trap(struct pt_regs *regs, long error_code, char *str,
175 unsigned long trapnr, int signr, siginfo_t *info)
176{
177 enum ctx_state prev_state = exception_enter();
178
179 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) !=
180 NOTIFY_STOP) {
181 conditional_sti(regs);
182 do_trap(trapnr, signr, str, regs, error_code, info);
183 }
184
185 exception_exit(prev_state);
186}
187
Ingo Molnarb5964402008-02-26 11:15:50 +0100188#define DO_ERROR(trapnr, signr, str, name) \
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200189dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
Ingo Molnarb5964402008-02-26 11:15:50 +0100190{ \
Oleg Nesterovdff07962014-05-07 17:21:34 +0200191 do_error_trap(regs, error_code, str, trapnr, signr, NULL); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Alexander van Heukelum3c1326f2008-09-26 14:03:08 +0200194#define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200195dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
Ingo Molnarb5964402008-02-26 11:15:50 +0100196{ \
197 siginfo_t info; \
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100198 \
Ingo Molnarb5964402008-02-26 11:15:50 +0100199 info.si_signo = signr; \
200 info.si_errno = 0; \
201 info.si_code = sicode; \
202 info.si_addr = (void __user *)siaddr; \
Oleg Nesterovdff07962014-05-07 17:21:34 +0200203 \
204 do_error_trap(regs, error_code, str, trapnr, signr, &info); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205}
206
Ingo Molnard8af4ce2013-12-12 14:46:42 +0100207DO_ERROR_INFO(X86_TRAP_DE, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip )
208DO_ERROR (X86_TRAP_OF, SIGSEGV, "overflow", overflow )
209DO_ERROR (X86_TRAP_BR, SIGSEGV, "bounds", bounds )
210DO_ERROR_INFO(X86_TRAP_UD, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip )
211DO_ERROR (X86_TRAP_OLD_MF, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun )
212DO_ERROR (X86_TRAP_TS, SIGSEGV, "invalid TSS", invalid_TSS )
213DO_ERROR (X86_TRAP_NP, SIGBUS, "segment not present", segment_not_present )
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200214#ifdef CONFIG_X86_32
Ingo Molnard8af4ce2013-12-12 14:46:42 +0100215DO_ERROR (X86_TRAP_SS, SIGBUS, "stack segment", stack_segment )
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200216#endif
Ingo Molnard8af4ce2013-12-12 14:46:42 +0100217DO_ERROR_INFO(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0 )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200219#ifdef CONFIG_X86_64
220/* Runs on IST stack */
221dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code)
222{
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100223 enum ctx_state prev_state;
224
225 prev_state = exception_enter();
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200226 if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200227 X86_TRAP_SS, SIGBUS) != NOTIFY_STOP) {
228 preempt_conditional_sti(regs);
229 do_trap(X86_TRAP_SS, SIGBUS, "stack segment", regs, error_code, NULL);
230 preempt_conditional_cli(regs);
231 }
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100232 exception_exit(prev_state);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200233}
234
235dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
236{
237 static const char str[] = "double fault";
238 struct task_struct *tsk = current;
239
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100240 exception_enter();
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200241 /* Return not checked because double check cannot be ignored */
Kees Cookc9408262012-03-09 16:07:10 -0800242 notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_DF, SIGSEGV);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200243
244 tsk->thread.error_code = error_code;
Srikar Dronamraju51e7dc72012-03-12 14:55:55 +0530245 tsk->thread.trap_nr = X86_TRAP_DF;
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200246
Borislav Petkov4d067d82013-05-09 12:02:29 +0200247#ifdef CONFIG_DOUBLEFAULT
248 df_debug(regs, error_code);
249#endif
Ingo Molnarbd8b96d2008-12-26 09:20:22 +0100250 /*
251 * This is always a kernel trap and never fixable (and thus must
252 * never return).
253 */
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200254 for (;;)
255 die(str, regs, error_code);
256}
257#endif
258
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200259dotraplinkage void __kprobes
Alexander van Heukelum13485ab2008-07-02 01:32:04 +0200260do_general_protection(struct pt_regs *regs, long error_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Alexander van Heukelum13485ab2008-07-02 01:32:04 +0200262 struct task_struct *tsk;
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100263 enum ctx_state prev_state;
Ingo Molnarb5964402008-02-26 11:15:50 +0100264
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100265 prev_state = exception_enter();
Alexander van Heukelumc6df0d72008-09-09 21:56:07 +0200266 conditional_sti(regs);
267
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200268#ifdef CONFIG_X86_32
Frederic Weisbeckeref3f62882012-09-24 21:05:52 +0200269 if (regs->flags & X86_VM_MASK) {
270 local_irq_enable();
271 handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200272 goto exit;
Frederic Weisbeckeref3f62882012-09-24 21:05:52 +0200273 }
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200274#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Alexander van Heukelum13485ab2008-07-02 01:32:04 +0200276 tsk = current;
Frederic Weisbeckeref3f62882012-09-24 21:05:52 +0200277 if (!user_mode(regs)) {
278 if (fixup_exception(regs))
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200279 goto exit;
Frederic Weisbeckeref3f62882012-09-24 21:05:52 +0200280
281 tsk->thread.error_code = error_code;
282 tsk->thread.trap_nr = X86_TRAP_GP;
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200283 if (notify_die(DIE_GPF, "general protection fault", regs, error_code,
284 X86_TRAP_GP, SIGSEGV) != NOTIFY_STOP)
Frederic Weisbeckeref3f62882012-09-24 21:05:52 +0200285 die("general protection fault", regs, error_code);
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200286 goto exit;
Frederic Weisbeckeref3f62882012-09-24 21:05:52 +0200287 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Alexander van Heukelum13485ab2008-07-02 01:32:04 +0200289 tsk->thread.error_code = error_code;
Srikar Dronamraju51e7dc72012-03-12 14:55:55 +0530290 tsk->thread.trap_nr = X86_TRAP_GP;
Ingo Molnarb5964402008-02-26 11:15:50 +0100291
Alexander van Heukelum13485ab2008-07-02 01:32:04 +0200292 if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) &&
293 printk_ratelimit()) {
Joe Perchesc767a542012-05-21 19:50:07 -0700294 pr_info("%s[%d] general protection ip:%lx sp:%lx error:%lx",
Alexander van Heukelum13485ab2008-07-02 01:32:04 +0200295 tsk->comm, task_pid_nr(tsk),
296 regs->ip, regs->sp, error_code);
Andi Kleen03252912008-01-30 13:33:18 +0100297 print_vma_addr(" in ", regs->ip);
Joe Perchesc767a542012-05-21 19:50:07 -0700298 pr_cont("\n");
Andi Kleen03252912008-01-30 13:33:18 +0100299 }
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +0200300
Oleg Nesterov38cad572014-05-07 16:47:09 +0200301 force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200302exit:
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100303 exception_exit(prev_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304}
305
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +0200306/* May run on IST stack. */
Steven Rostedt08d636b2011-08-16 09:57:10 -0400307dotraplinkage void __kprobes notrace do_int3(struct pt_regs *regs, long error_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100309 enum ctx_state prev_state;
310
Steven Rostedt08d636b2011-08-16 09:57:10 -0400311#ifdef CONFIG_DYNAMIC_FTRACE
Steven Rostedta192cd02012-05-30 13:26:37 -0400312 /*
313 * ftrace must be first, everything else may cause a recursive crash.
314 * See note by declaration of modifying_ftrace_code in ftrace.c
315 */
316 if (unlikely(atomic_read(&modifying_ftrace_code)) &&
317 ftrace_int3_handler(regs))
Steven Rostedt08d636b2011-08-16 09:57:10 -0400318 return;
319#endif
Jiri Kosina17f41572013-07-23 10:09:28 +0200320 if (poke_int3_handler(regs))
321 return;
322
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100323 prev_state = exception_enter();
Jason Wesself503b5a2010-05-20 21:04:25 -0500324#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
Kees Cookc9408262012-03-09 16:07:10 -0800325 if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
326 SIGTRAP) == NOTIFY_STOP)
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200327 goto exit;
Jason Wesself503b5a2010-05-20 21:04:25 -0500328#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
Srikar Dronamrajucc3a1bf2011-10-25 19:51:59 +0530329
Kees Cookc9408262012-03-09 16:07:10 -0800330 if (notify_die(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP,
331 SIGTRAP) == NOTIFY_STOP)
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200332 goto exit;
Ingo Molnarb5964402008-02-26 11:15:50 +0100333
Steven Rostedt42181182011-12-16 11:43:02 -0500334 /*
335 * Let others (NMI) know that the debug stack is in use
336 * as we may switch to the interrupt stack.
337 */
338 debug_stack_usage_inc();
Alexander van Heukelum4915a352008-10-03 22:00:34 +0200339 preempt_conditional_sti(regs);
Kees Cookc9408262012-03-09 16:07:10 -0800340 do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL);
Alexander van Heukelum4915a352008-10-03 22:00:34 +0200341 preempt_conditional_cli(regs);
Steven Rostedt42181182011-12-16 11:43:02 -0500342 debug_stack_usage_dec();
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200343exit:
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100344 exception_exit(prev_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200347#ifdef CONFIG_X86_64
Ingo Molnarbd8b96d2008-12-26 09:20:22 +0100348/*
349 * Help handler running on IST stack to switch back to user stack
350 * for scheduling or signal handling. The actual stack switch is done in
351 * entry.S
352 */
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200353asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
354{
355 struct pt_regs *regs = eregs;
356 /* Did already sync */
357 if (eregs == (struct pt_regs *)eregs->sp)
358 ;
359 /* Exception from user space */
360 else if (user_mode(eregs))
361 regs = task_pt_regs(current);
Ingo Molnarbd8b96d2008-12-26 09:20:22 +0100362 /*
363 * Exception from kernel and interrupts are enabled. Move to
364 * kernel process stack.
365 */
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200366 else if (eregs->flags & X86_EFLAGS_IF)
367 regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs));
368 if (eregs != regs)
369 *regs = *eregs;
370 return regs;
371}
372#endif
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374/*
375 * Our handling of the processor debug registers is non-trivial.
376 * We do not clear them on entry and exit from the kernel. Therefore
377 * it is possible to get a watchpoint trap here from inside the kernel.
378 * However, the code in ./ptrace.c has ensured that the user can
379 * only set watchpoints on userspace addresses. Therefore the in-kernel
380 * watchpoint trap can only occur in code which is reading/writing
381 * from user space. Such code must not hold kernel locks (since it
382 * can equally take a page fault), therefore it is safe to call
383 * force_sig_info even though that claims and releases locks.
Ingo Molnarb5964402008-02-26 11:15:50 +0100384 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 * Code in ./signal.c ensures that the debug control register
386 * is restored before we deliver any signal, and therefore that
387 * user code runs with the correct debug control register even though
388 * we clear it here.
389 *
390 * Being careful here means that we don't have to be as careful in a
391 * lot of more complicated places (task switching can be a bit lazy
392 * about restoring all the debug state, and ptrace doesn't have to
393 * find every occurrence of the TF bit that could be saved away even
394 * by user code)
Alexander van Heukelumc1d518c2008-10-03 23:17:11 +0200395 *
396 * May run on IST stack.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 */
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200398dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 struct task_struct *tsk = current;
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100401 enum ctx_state prev_state;
Frederic Weisbeckera1e80fa2010-06-30 15:09:06 +0200402 int user_icebp = 0;
K.Prasad08d68322009-06-01 23:44:08 +0530403 unsigned long dr6;
Srinivasa Dsda654b72008-09-23 15:23:52 +0530404 int si_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100406 prev_state = exception_enter();
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200407
K.Prasad08d68322009-06-01 23:44:08 +0530408 get_debugreg(dr6, 6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
K.Prasad40f92492010-01-28 16:44:01 +0530410 /* Filter out all the reserved bits which are preset to 1 */
411 dr6 &= ~DR6_RESERVED;
412
Frederic Weisbeckera1e80fa2010-06-30 15:09:06 +0200413 /*
414 * If dr6 has no reason to give us about the origin of this trap,
415 * then it's very likely the result of an icebp/int01 trap.
416 * User wants a sigtrap for that.
417 */
418 if (!dr6 && user_mode(regs))
419 user_icebp = 1;
420
Vegard Nossumf8561292008-04-04 00:53:23 +0200421 /* Catch kmemcheck conditions first of all! */
Ingo Molnareadb8a02009-06-17 12:52:15 +0200422 if ((dr6 & DR_STEP) && kmemcheck_trap(regs))
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200423 goto exit;
Vegard Nossumf8561292008-04-04 00:53:23 +0200424
K.Prasad08d68322009-06-01 23:44:08 +0530425 /* DR6 may or may not be cleared by the CPU */
426 set_debugreg(0, 6);
Roland McGrath10faa812008-01-30 13:30:54 +0100427
Peter Zijlstraea8e61b2010-03-25 14:51:51 +0100428 /*
429 * The processor cleared BTF, so don't mark that we need it set.
430 */
431 clear_tsk_thread_flag(tsk, TIF_BLOCKSTEP);
432
K.Prasad08d68322009-06-01 23:44:08 +0530433 /* Store the virtualized DR6 value */
434 tsk->thread.debugreg6 = dr6;
435
Rusty Russell5a802e12013-06-16 14:12:47 +0930436 if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, error_code,
K.Prasad62edab92009-06-01 23:47:06 +0530437 SIGTRAP) == NOTIFY_STOP)
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200438 goto exit;
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +0200439
Steven Rostedt42181182011-12-16 11:43:02 -0500440 /*
441 * Let others (NMI) know that the debug stack is in use
442 * as we may switch to the interrupt stack.
443 */
444 debug_stack_usage_inc();
445
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 /* It's safe to allow irq's after DR6 has been saved */
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +0200447 preempt_conditional_sti(regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
K.Prasad08d68322009-06-01 23:44:08 +0530449 if (regs->flags & X86_VM_MASK) {
Kees Cookc9408262012-03-09 16:07:10 -0800450 handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code,
451 X86_TRAP_DB);
Bart Oldeman65542872010-09-23 13:16:58 -0400452 preempt_conditional_cli(regs);
Steven Rostedt42181182011-12-16 11:43:02 -0500453 debug_stack_usage_dec();
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200454 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 }
456
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 /*
K.Prasad08d68322009-06-01 23:44:08 +0530458 * Single-stepping through system calls: ignore any exceptions in
459 * kernel space, but re-enable TF when returning to user mode.
460 *
461 * We already checked v86 mode above, so we can check for kernel mode
462 * by just checking the CPL of CS.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 */
K.Prasad08d68322009-06-01 23:44:08 +0530464 if ((dr6 & DR_STEP) && !user_mode(regs)) {
465 tsk->thread.debugreg6 &= ~DR_STEP;
466 set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
467 regs->flags &= ~X86_EFLAGS_TF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 }
K.Prasad08d68322009-06-01 23:44:08 +0530469 si_code = get_si_code(tsk->thread.debugreg6);
Frederic Weisbeckera1e80fa2010-06-30 15:09:06 +0200470 if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp)
K.Prasad08d68322009-06-01 23:44:08 +0530471 send_sigtrap(tsk, regs, error_code, si_code);
Alexander van Heukelum3d2a71a2008-09-30 18:41:37 +0200472 preempt_conditional_cli(regs);
Steven Rostedt42181182011-12-16 11:43:02 -0500473 debug_stack_usage_dec();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200475exit:
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100476 exception_exit(prev_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477}
478
479/*
480 * Note that we play around with the 'TS' bit in an attempt to get
481 * the correct behaviour even in the presence of the asynchronous
482 * IRQ13 behaviour
483 */
Oleg Nesterov5e1b05b2014-05-08 20:34:00 +0200484static void math_error(struct pt_regs *regs, int error_code, int trapnr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485{
Brian Gerste2e75c912010-03-21 09:00:45 -0400486 struct task_struct *task = current;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 siginfo_t info;
Brian Gerst9b6dba92010-03-21 09:00:44 -0400488 unsigned short err;
Kees Cookc9408262012-03-09 16:07:10 -0800489 char *str = (trapnr == X86_TRAP_MF) ? "fpu exception" :
490 "simd exception";
Brian Gerste2e75c912010-03-21 09:00:45 -0400491
492 if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, SIGFPE) == NOTIFY_STOP)
493 return;
494 conditional_sti(regs);
495
496 if (!user_mode_vm(regs))
497 {
498 if (!fixup_exception(regs)) {
499 task->thread.error_code = error_code;
Srikar Dronamraju51e7dc72012-03-12 14:55:55 +0530500 task->thread.trap_nr = trapnr;
Brian Gerste2e75c912010-03-21 09:00:45 -0400501 die(str, regs, error_code);
502 }
503 return;
504 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 /*
507 * Save the info for the exception handler and clear the error.
508 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 save_init_fpu(task);
Srikar Dronamraju51e7dc72012-03-12 14:55:55 +0530510 task->thread.trap_nr = trapnr;
Brian Gerst9b6dba92010-03-21 09:00:44 -0400511 task->thread.error_code = error_code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 info.si_signo = SIGFPE;
513 info.si_errno = 0;
Brian Gerst9b6dba92010-03-21 09:00:44 -0400514 info.si_addr = (void __user *)regs->ip;
Kees Cookc9408262012-03-09 16:07:10 -0800515 if (trapnr == X86_TRAP_MF) {
Brian Gerst9b6dba92010-03-21 09:00:44 -0400516 unsigned short cwd, swd;
517 /*
518 * (~cwd & swd) will mask out exceptions that are not set to unmasked
519 * status. 0x3f is the exception bits in these regs, 0x200 is the
520 * C1 reg you need in case of a stack fault, 0x040 is the stack
521 * fault bit. We should only be taking one exception at a time,
522 * so if this combination doesn't produce any single exception,
523 * then we have a bad program that isn't synchronizing its FPU usage
524 * and it will suffer the consequences since we won't be able to
525 * fully reproduce the context of the exception
526 */
527 cwd = get_fpu_cwd(task);
528 swd = get_fpu_swd(task);
H. Peter Anvinadf77bac2008-12-22 17:56:05 -0800529
Brian Gerst9b6dba92010-03-21 09:00:44 -0400530 err = swd & ~cwd;
531 } else {
532 /*
533 * The SIMD FPU exceptions are handled a little differently, as there
534 * is only a single status/control register. Thus, to determine which
535 * unmasked exception was caught we must mask the exception mask bits
536 * at 0x1f80, and then use these to mask the exception bits at 0x3f.
537 */
538 unsigned short mxcsr = get_fpu_mxcsr(task);
539 err = ~(mxcsr >> 7) & mxcsr;
540 }
H. Peter Anvinadf77bac2008-12-22 17:56:05 -0800541
542 if (err & 0x001) { /* Invalid op */
Ingo Molnarb5964402008-02-26 11:15:50 +0100543 /*
544 * swd & 0x240 == 0x040: Stack Underflow
545 * swd & 0x240 == 0x240: Stack Overflow
546 * User must clear the SF bit (0x40) if set
547 */
548 info.si_code = FPE_FLTINV;
H. Peter Anvinadf77bac2008-12-22 17:56:05 -0800549 } else if (err & 0x004) { /* Divide by Zero */
Ingo Molnarb5964402008-02-26 11:15:50 +0100550 info.si_code = FPE_FLTDIV;
H. Peter Anvinadf77bac2008-12-22 17:56:05 -0800551 } else if (err & 0x008) { /* Overflow */
Ingo Molnarb5964402008-02-26 11:15:50 +0100552 info.si_code = FPE_FLTOVF;
H. Peter Anvinadf77bac2008-12-22 17:56:05 -0800553 } else if (err & 0x012) { /* Denormal, Underflow */
554 info.si_code = FPE_FLTUND;
555 } else if (err & 0x020) { /* Precision */
Ingo Molnarb5964402008-02-26 11:15:50 +0100556 info.si_code = FPE_FLTRES;
H. Peter Anvinadf77bac2008-12-22 17:56:05 -0800557 } else {
Ingo Molnarbd8b96d2008-12-26 09:20:22 +0100558 /*
Kees Cookc9408262012-03-09 16:07:10 -0800559 * If we're using IRQ 13, or supposedly even some trap
560 * X86_TRAP_MF implementations, it's possible
561 * we get a spurious trap, which is not an error.
Ingo Molnarbd8b96d2008-12-26 09:20:22 +0100562 */
Kees Cookc9408262012-03-09 16:07:10 -0800563 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 }
565 force_sig_info(SIGFPE, &info, task);
566}
567
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200568dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100570 enum ctx_state prev_state;
571
572 prev_state = exception_enter();
Kees Cookc9408262012-03-09 16:07:10 -0800573 math_error(regs, error_code, X86_TRAP_MF);
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100574 exception_exit(prev_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575}
576
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200577dotraplinkage void
578do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100580 enum ctx_state prev_state;
581
582 prev_state = exception_enter();
Kees Cookc9408262012-03-09 16:07:10 -0800583 math_error(regs, error_code, X86_TRAP_XF);
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100584 exception_exit(prev_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585}
586
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200587dotraplinkage void
588do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Alexander van Heukelumcf819782008-09-09 21:56:08 +0200590 conditional_sti(regs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591#if 0
592 /* No need to warn about this any longer. */
Joe Perchesc767a542012-05-21 19:50:07 -0700593 pr_info("Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594#endif
595}
596
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200597asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
598{
599}
600
Andi Kleen7856f6c2009-04-28 23:32:56 +0200601asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void)
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200602{
603}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
605/*
Linus Torvalds34ddc812012-02-18 12:56:35 -0800606 * 'math_state_restore()' saves the current math information in the
607 * old math state array, and gets the new ones from the current task
608 *
609 * Careful.. There are problems with IBM-designed IRQ13 behaviour.
610 * Don't touch unless you *really* know how it works.
611 *
612 * Must be called with kernel preemption disabled (eg with local
613 * local interrupts as in the case of do_device_not_available).
614 */
615void math_state_restore(void)
616{
617 struct task_struct *tsk = current;
618
619 if (!tsk_used_math(tsk)) {
620 local_irq_enable();
621 /*
622 * does a slab alloc which can sleep
623 */
624 if (init_fpu(tsk)) {
625 /*
626 * ran out of memory!
627 */
628 do_group_exit(SIGKILL);
629 return;
630 }
631 local_irq_disable();
632 }
633
634 __thread_fpu_begin(tsk);
Suresh Siddha304bced2012-08-24 14:13:02 -0700635
Linus Torvalds80ab6f12012-02-19 11:48:44 -0800636 /*
637 * Paranoid restore. send a SIGSEGV if we fail to restore the state.
638 */
639 if (unlikely(restore_fpu_checking(tsk))) {
Suresh Siddha304bced2012-08-24 14:13:02 -0700640 drop_init_fpu(tsk);
Oleg Nesterov38cad572014-05-07 16:47:09 +0200641 force_sig_info(SIGSEGV, SEND_SIG_PRIV, tsk);
Linus Torvalds80ab6f12012-02-19 11:48:44 -0800642 return;
643 }
Linus Torvaldsb3b08702012-02-16 15:45:23 -0800644
Vineet Guptac375f152013-11-12 15:08:46 -0800645 tsk->thread.fpu_counter++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}
Rusty Russell5992b6d2007-07-19 01:49:21 -0700647EXPORT_SYMBOL_GPL(math_state_restore);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200649dotraplinkage void __kprobes
Brian Gerstaa78bcf2009-02-10 09:51:45 -0500650do_device_not_available(struct pt_regs *regs, long error_code)
Alexander van Heukelum7643e9b2008-09-09 21:56:02 +0200651{
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100652 enum ctx_state prev_state;
653
654 prev_state = exception_enter();
Suresh Siddha5d2bd702012-09-06 14:58:52 -0700655 BUG_ON(use_eager_fpu());
Suresh Siddha304bced2012-08-24 14:13:02 -0700656
Brian Gersta334fe42010-09-03 21:17:15 -0400657#ifdef CONFIG_MATH_EMULATION
Alexander van Heukelum7643e9b2008-09-09 21:56:02 +0200658 if (read_cr0() & X86_CR0_EM) {
Tejun Heod3157602009-02-09 22:17:39 +0900659 struct math_emu_info info = { };
660
Alexander van Heukelum7643e9b2008-09-09 21:56:02 +0200661 conditional_sti(regs);
Tejun Heod3157602009-02-09 22:17:39 +0900662
Brian Gerstaa78bcf2009-02-10 09:51:45 -0500663 info.regs = regs;
Tejun Heod3157602009-02-09 22:17:39 +0900664 math_emulate(&info);
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100665 exception_exit(prev_state);
Brian Gersta334fe42010-09-03 21:17:15 -0400666 return;
Alexander van Heukelum7643e9b2008-09-09 21:56:02 +0200667 }
Brian Gersta334fe42010-09-03 21:17:15 -0400668#endif
669 math_state_restore(); /* interrupts still off */
670#ifdef CONFIG_X86_32
671 conditional_sti(regs);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200672#endif
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100673 exception_exit(prev_state);
Alexander van Heukelum7643e9b2008-09-09 21:56:02 +0200674}
675
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200676#ifdef CONFIG_X86_32
Alexander van Heukelume407d6202008-09-30 18:41:36 +0200677dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
Alexander van Heukelumf8e08702008-09-09 21:56:13 +0200678{
679 siginfo_t info;
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100680 enum ctx_state prev_state;
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200681
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100682 prev_state = exception_enter();
Alexander van Heukelumf8e08702008-09-09 21:56:13 +0200683 local_irq_enable();
684
685 info.si_signo = SIGILL;
686 info.si_errno = 0;
687 info.si_code = ILL_BADSTK;
Hannes Ederfc6fcdf2009-02-22 01:00:57 +0100688 info.si_addr = NULL;
Kees Cookc9408262012-03-09 16:07:10 -0800689 if (notify_die(DIE_TRAP, "iret exception", regs, error_code,
Frederic Weisbecker6ba3c972012-07-11 20:26:35 +0200690 X86_TRAP_IRET, SIGILL) != NOTIFY_STOP) {
691 do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code,
692 &info);
693 }
Frederic Weisbecker6c1e0252013-02-24 01:19:14 +0100694 exception_exit(prev_state);
Alexander van Heukelumf8e08702008-09-09 21:56:13 +0200695}
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200696#endif
Alexander van Heukelumf8e08702008-09-09 21:56:13 +0200697
Jan Kiszka29c84392010-05-20 21:04:29 -0500698/* Set of traps needed for early debugging. */
699void __init early_trap_init(void)
700{
Kees Cookc9408262012-03-09 16:07:10 -0800701 set_intr_gate_ist(X86_TRAP_DB, &debug, DEBUG_STACK);
Jan Kiszka29c84392010-05-20 21:04:29 -0500702 /* int3 can be called from all */
Kees Cookc9408262012-03-09 16:07:10 -0800703 set_system_intr_gate_ist(X86_TRAP_BP, &int3, DEBUG_STACK);
H. Peter Anvin8170e6b2013-01-24 12:19:52 -0800704#ifdef CONFIG_X86_32
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400705 set_intr_gate(X86_TRAP_PF, page_fault);
H. Peter Anvin8170e6b2013-01-24 12:19:52 -0800706#endif
Jan Kiszka29c84392010-05-20 21:04:29 -0500707 load_idt(&idt_descr);
708}
709
H. Peter Anvin8170e6b2013-01-24 12:19:52 -0800710void __init early_trap_pf_init(void)
711{
712#ifdef CONFIG_X86_64
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400713 set_intr_gate(X86_TRAP_PF, page_fault);
H. Peter Anvin8170e6b2013-01-24 12:19:52 -0800714#endif
715}
716
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717void __init trap_init(void)
718{
Rusty Russelldbeb2be2007-10-19 20:35:03 +0200719 int i;
720
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721#ifdef CONFIG_EISA
Ingo Molnar927222b2008-01-30 13:33:49 +0100722 void __iomem *p = early_ioremap(0x0FFFD9, 4);
Ingo Molnarb5964402008-02-26 11:15:50 +0100723
724 if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 EISA_bus = 1;
Ingo Molnar927222b2008-01-30 13:33:49 +0100726 early_iounmap(p, 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727#endif
728
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400729 set_intr_gate(X86_TRAP_DE, divide_error);
Kees Cookc9408262012-03-09 16:07:10 -0800730 set_intr_gate_ist(X86_TRAP_NMI, &nmi, NMI_STACK);
Alexander van Heukelum699d2932008-10-03 22:00:32 +0200731 /* int4 can be called from all */
Kees Cookc9408262012-03-09 16:07:10 -0800732 set_system_intr_gate(X86_TRAP_OF, &overflow);
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400733 set_intr_gate(X86_TRAP_BR, bounds);
734 set_intr_gate(X86_TRAP_UD, invalid_op);
735 set_intr_gate(X86_TRAP_NM, device_not_available);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200736#ifdef CONFIG_X86_32
Kees Cookc9408262012-03-09 16:07:10 -0800737 set_task_gate(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200738#else
Kees Cookc9408262012-03-09 16:07:10 -0800739 set_intr_gate_ist(X86_TRAP_DF, &double_fault, DOUBLEFAULT_STACK);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200740#endif
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400741 set_intr_gate(X86_TRAP_OLD_MF, coprocessor_segment_overrun);
742 set_intr_gate(X86_TRAP_TS, invalid_TSS);
743 set_intr_gate(X86_TRAP_NP, segment_not_present);
Kees Cookc9408262012-03-09 16:07:10 -0800744 set_intr_gate_ist(X86_TRAP_SS, &stack_segment, STACKFAULT_STACK);
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400745 set_intr_gate(X86_TRAP_GP, general_protection);
746 set_intr_gate(X86_TRAP_SPURIOUS, spurious_interrupt_bug);
747 set_intr_gate(X86_TRAP_MF, coprocessor_error);
748 set_intr_gate(X86_TRAP_AC, alignment_check);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749#ifdef CONFIG_X86_MCE
Kees Cookc9408262012-03-09 16:07:10 -0800750 set_intr_gate_ist(X86_TRAP_MC, &machine_check, MCE_STACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751#endif
Seiji Aguchi25c74b12013-10-30 16:37:00 -0400752 set_intr_gate(X86_TRAP_XF, simd_coprocessor_error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Yinghai Lubb3f0b52009-01-25 02:38:09 -0800754 /* Reserve all the builtin and the syscall vector: */
755 for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
756 set_bit(i, used_vectors);
757
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200758#ifdef CONFIG_IA32_EMULATION
759 set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
Yinghai Lubb3f0b52009-01-25 02:38:09 -0800760 set_bit(IA32_SYSCALL_VECTOR, used_vectors);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200761#endif
762
763#ifdef CONFIG_X86_32
Alexander van Heukelum699d2932008-10-03 22:00:32 +0200764 set_system_trap_gate(SYSCALL_VECTOR, &system_call);
Rusty Russelldbeb2be2007-10-19 20:35:03 +0200765 set_bit(SYSCALL_VECTOR, used_vectors);
Alexander van Heukelum081f75b2008-10-03 22:00:39 +0200766#endif
Yinghai Lubb3f0b52009-01-25 02:38:09 -0800767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 /*
Kees Cook4eefbe72013-04-10 12:24:22 -0700769 * Set the IDT descriptor to a fixed read-only location, so that the
770 * "sidt" instruction will not leak the location of the kernel, and
771 * to defend the IDT against arbitrary memory write vulnerabilities.
772 * It will be reloaded in cpu_init() */
773 __set_fixmap(FIX_RO_IDT, __pa_symbol(idt_table), PAGE_KERNEL_RO);
774 idt_descr.address = fix_to_virt(FIX_RO_IDT);
775
776 /*
Ingo Molnarb5964402008-02-26 11:15:50 +0100777 * Should be a barrier for any external CPU state:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 */
779 cpu_init();
780
Thomas Gleixner428cf902009-08-20 10:35:46 +0200781 x86_init.irqs.trap_init();
Steven Rostedt228bdaa2011-12-09 03:02:19 -0500782
783#ifdef CONFIG_X86_64
Seiji Aguchi629f4f92013-06-20 11:45:44 -0400784 memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16);
Kees Cookc9408262012-03-09 16:07:10 -0800785 set_nmi_gate(X86_TRAP_DB, &debug);
786 set_nmi_gate(X86_TRAP_BP, &int3);
Steven Rostedt228bdaa2011-12-09 03:02:19 -0500787#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}