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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
17struct thread_info {
18 unsigned long flags; /* low level flags */
19};
20
21#define INIT_THREAD_INFO(tsk) \
22{ \
23 .flags = 0, \
24}
25#endif
26
27#ifdef CONFIG_THREAD_INFO_IN_TASK
28#define current_thread_info() ((struct thread_info *)current)
29#endif
30
31/*
32 * System call restart block.
33 */
34struct restart_block {
35 long (*fn)(struct restart_block *);
36 union {
37 /* For futex_wait and futex_wait_requeue_pi */
38 struct {
39 u32 __user *uaddr;
40 u32 val;
41 u32 flags;
42 u32 bitset;
43 u64 time;
44 u32 __user *uaddr2;
45 } futex;
46 /* For nanosleep */
47 struct {
48 clockid_t clockid;
49 struct timespec __user *rmtp;
50#ifdef CONFIG_COMPAT
51 struct compat_timespec __user *compat_rmtp;
52#endif
53 u64 expires;
54 } nanosleep;
55 /* For poll */
56 struct {
57 struct pollfd __user *ufds;
58 int nfds;
59 int has_timeout;
60 unsigned long tv_sec;
61 unsigned long tv_nsec;
62 } poll;
63 };
64};
65
66extern long do_no_restart_syscall(struct restart_block *parm);
67
68#include <linux/bitops.h>
69#include <asm/thread_info.h>
70
71#ifdef __KERNEL__
72
73#ifdef CONFIG_DEBUG_STACK_USAGE
74# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
75 __GFP_ZERO)
76#else
77# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
78#endif
79
80/*
81 * flag set/clear/test wrappers
82 * - pass TIF_xxxx constants to these functions
83 */
84
85static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
86{
87 set_bit(flag, (unsigned long *)&ti->flags);
88}
89
90static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
91{
92 clear_bit(flag, (unsigned long *)&ti->flags);
93}
94
95static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
96{
97 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
98}
99
100static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
101{
102 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
103}
104
105static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
106{
107 return test_bit(flag, (unsigned long *)&ti->flags);
108}
109
110#define set_thread_flag(flag) \
111 set_ti_thread_flag(current_thread_info(), flag)
112#define clear_thread_flag(flag) \
113 clear_ti_thread_flag(current_thread_info(), flag)
114#define test_and_set_thread_flag(flag) \
115 test_and_set_ti_thread_flag(current_thread_info(), flag)
116#define test_and_clear_thread_flag(flag) \
117 test_and_clear_ti_thread_flag(current_thread_info(), flag)
118#define test_thread_flag(flag) \
119 test_ti_thread_flag(current_thread_info(), flag)
120
121#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
122
123#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
124static inline int arch_within_stack_frames(const void * const stack,
125 const void * const stackend,
126 const void *obj, unsigned long len)
127{
128 return 0;
129}
130#endif
131
132#ifdef CONFIG_HARDENED_USERCOPY
133extern void __check_object_size(const void *ptr, unsigned long n,
134 bool to_user);
135
136static __always_inline void check_object_size(const void *ptr, unsigned long n,
137 bool to_user)
138{
139 if (!__builtin_constant_p(n))
140 __check_object_size(ptr, n, to_user);
141}
142#else
143static inline void check_object_size(const void *ptr, unsigned long n,
144 bool to_user)
145{ }
146#endif /* CONFIG_HARDENED_USERCOPY */
147
148#endif /* __KERNEL__ */
149
150#endif /* _LINUX_THREAD_INFO_H */