| 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 | |
| 13 | struct timespec; |
| 14 | struct 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 | */ |
| 23 | struct 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 | |
| 55 | extern 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 | |
| 74 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| 75 | { |
| 76 | set_bit(flag, (unsigned long *)&ti->flags); |
| 77 | } |
| 78 | |
| 79 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 80 | { |
| 81 | clear_bit(flag, (unsigned long *)&ti->flags); |
| 82 | } |
| 83 | |
| 84 | static 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 | |
| 89 | static 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 | |
| 94 | static 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 |
| 113 | static 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 |
| 122 | extern void __check_object_size(const void *ptr, unsigned long n, |
| 123 | bool to_user); |
| 124 | |
| 125 | static __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 |
| 132 | static 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 */ |