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1/* 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
10#include <linux/types.h>
11#include <linux/bug.h>
12
13struct timespec;
14struct compat_timespec;
15
16#ifdef CONFIG_THREAD_INFO_IN_TASK
17#define current_thread_info() ((struct thread_info *)current)
18#endif
19
20/*
21 * System call restart block.
22 */
23struct restart_block {
24 long (*fn)(struct restart_block *);
25 union {
26 /* For futex_wait and futex_wait_requeue_pi */
27 struct {
28 u32 __user *uaddr;
29 u32 val;
30 u32 flags;
31 u32 bitset;
32 u64 time;
33 u32 __user *uaddr2;
34 } futex;
35 /* For nanosleep */
36 struct {
37 clockid_t clockid;
38 struct timespec __user *rmtp;
39#ifdef CONFIG_COMPAT
40 struct compat_timespec __user *compat_rmtp;
41#endif
42 u64 expires;
43 } nanosleep;
44 /* 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;
52 };
53};
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
62#ifdef CONFIG_DEBUG_STACK_USAGE
63# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
64 __GFP_ZERO)
65#else
66# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
67#endif
68
69/*
70 * flag set/clear/test wrappers
71 * - pass TIF_xxxx constants to these functions
72 */
73
74static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
75{
76 set_bit(flag, (unsigned long *)&ti->flags);
77}
78
79static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
80{
81 clear_bit(flag, (unsigned long *)&ti->flags);
82}
83
84static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
85{
86 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
87}
88
89static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
90{
91 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
92}
93
94static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
95{
96 return test_bit(flag, (unsigned long *)&ti->flags);
97}
98
99#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)
109
110#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
111
112#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
121#ifdef CONFIG_HARDENED_USERCOPY
122extern void __check_object_size(const void *ptr, unsigned long n,
123 bool to_user);
124
125static __always_inline void check_object_size(const void *ptr, unsigned long n,
126 bool to_user)
127{
128 if (!__builtin_constant_p(n))
129 __check_object_size(ptr, n, to_user);
130}
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
137#endif /* __KERNEL__ */
138
139#endif /* _LINUX_THREAD_INFO_H */