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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* thread_info.h: common low-level thread information accessors
2 *
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds
5 */
6
7#ifndef _LINUX_THREAD_INFO_H
8#define _LINUX_THREAD_INFO_H
9
Steven Rostedtce6bd422007-12-05 15:46:09 +010010#include <linux/types.h>
Al Viroedd63a22012-04-27 13:42:45 -040011#include <linux/bug.h>
Steven Rostedtce6bd422007-12-05 15:46:09 +010012
Thomas Gleixnera332d862008-02-10 09:04:12 +010013struct timespec;
14struct compat_timespec;
15
Andy Lutomirskic65eacb2016-09-13 14:29:24 -070016#ifdef CONFIG_THREAD_INFO_IN_TASK
Andy Lutomirskic65eacb2016-09-13 14:29:24 -070017#define current_thread_info() ((struct thread_info *)current)
18#endif
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020/*
Steven Rostedtce6bd422007-12-05 15:46:09 +010021 * System call restart block.
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 */
23struct restart_block {
24 long (*fn)(struct restart_block *);
Steven Rostedtce6bd422007-12-05 15:46:09 +010025 union {
Darren Hart52400ba2009-04-03 13:40:49 -070026 /* For futex_wait and futex_wait_requeue_pi */
Steven Rostedtce6bd422007-12-05 15:46:09 +010027 struct {
Namhyung Kima3c74c52010-09-14 21:43:47 +090028 u32 __user *uaddr;
Steven Rostedtce6bd422007-12-05 15:46:09 +010029 u32 val;
30 u32 flags;
Thomas Gleixnercd689982008-02-01 17:45:14 +010031 u32 bitset;
Steven Rostedtce6bd422007-12-05 15:46:09 +010032 u64 time;
Namhyung Kima3c74c52010-09-14 21:43:47 +090033 u32 __user *uaddr2;
Steven Rostedtce6bd422007-12-05 15:46:09 +010034 } futex;
Thomas Gleixnera332d862008-02-10 09:04:12 +010035 /* For nanosleep */
36 struct {
Thomas Gleixnerab8177b2011-05-20 13:05:15 +020037 clockid_t clockid;
Thomas Gleixnera332d862008-02-10 09:04:12 +010038 struct timespec __user *rmtp;
39#ifdef CONFIG_COMPAT
40 struct compat_timespec __user *compat_rmtp;
41#endif
42 u64 expires;
43 } nanosleep;
Thomas Gleixnerbe5dad22008-08-31 08:19:15 -070044 /* For poll */
45 struct {
46 struct pollfd __user *ufds;
47 int nfds;
48 int has_timeout;
49 unsigned long tv_sec;
50 unsigned long tv_nsec;
51 } poll;
Steven Rostedtce6bd422007-12-05 15:46:09 +010052 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070053};
54
55extern long do_no_restart_syscall(struct restart_block *parm);
56
57#include <linux/bitops.h>
58#include <asm/thread_info.h>
59
60#ifdef __KERNEL__
61
Thomas Gleixner2889f602012-05-05 15:05:41 +000062#ifdef CONFIG_DEBUG_STACK_USAGE
Vladimir Davydov5d097052016-01-14 15:18:21 -080063# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
64 __GFP_ZERO)
Thomas Gleixner2889f602012-05-05 15:05:41 +000065#else
Vladimir Davydov5d097052016-01-14 15:18:21 -080066# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
Thomas Gleixner2889f602012-05-05 15:05:41 +000067#endif
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069/*
70 * flag set/clear/test wrappers
71 * - pass TIF_xxxx constants to these functions
72 */
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
75{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010076 set_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
79static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
80{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010081 clear_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082}
83
84static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
85{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010086 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
89static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
90{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010091 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
94static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
95{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010096 return test_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Roman Zippel3b66a1e2005-11-13 16:06:59 -080099#define set_thread_flag(flag) \
100 set_ti_thread_flag(current_thread_info(), flag)
101#define clear_thread_flag(flag) \
102 clear_ti_thread_flag(current_thread_info(), flag)
103#define test_and_set_thread_flag(flag) \
104 test_and_set_ti_thread_flag(current_thread_info(), flag)
105#define test_and_clear_thread_flag(flag) \
106 test_and_clear_ti_thread_flag(current_thread_info(), flag)
107#define test_thread_flag(flag) \
108 test_ti_thread_flag(current_thread_info(), flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Peter Zijlstraea811742013-09-11 12:43:13 +0200110#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
111
Kees Cook0f60a8e2016-07-12 16:19:48 -0700112#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
113static inline int arch_within_stack_frames(const void * const stack,
114 const void * const stackend,
115 const void *obj, unsigned long len)
116{
117 return 0;
118}
119#endif
120
Kees Cookf5509cc2016-06-07 11:05:33 -0700121#ifdef CONFIG_HARDENED_USERCOPY
122extern void __check_object_size(const void *ptr, unsigned long n,
123 bool to_user);
124
Kees Cooka85d6b82016-09-07 09:39:32 -0700125static __always_inline void check_object_size(const void *ptr, unsigned long n,
126 bool to_user)
Kees Cookf5509cc2016-06-07 11:05:33 -0700127{
Kees Cook81409e92016-08-31 16:04:21 -0700128 if (!__builtin_constant_p(n))
129 __check_object_size(ptr, n, to_user);
Kees Cookf5509cc2016-06-07 11:05:33 -0700130}
131#else
132static inline void check_object_size(const void *ptr, unsigned long n,
133 bool to_user)
134{ }
135#endif /* CONFIG_HARDENED_USERCOPY */
136
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700137#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139#endif /* _LINUX_THREAD_INFO_H */