Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 10 | #include <linux/types.h> |
Al Viro | edd63a2 | 2012-04-27 13:42:45 -0400 | [diff] [blame] | 11 | #include <linux/bug.h> |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 12 | |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 13 | struct timespec; |
| 14 | struct compat_timespec; |
| 15 | |
Andy Lutomirski | c65eacb | 2016-09-13 14:29:24 -0700 | [diff] [blame] | 16 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
Andy Lutomirski | c65eacb | 2016-09-13 14:29:24 -0700 | [diff] [blame] | 17 | #define current_thread_info() ((struct thread_info *)current) |
| 18 | #endif |
| 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | /* |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 21 | * System call restart block. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
| 23 | struct restart_block { |
| 24 | long (*fn)(struct restart_block *); |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 25 | union { |
Darren Hart | 52400ba | 2009-04-03 13:40:49 -0700 | [diff] [blame] | 26 | /* For futex_wait and futex_wait_requeue_pi */ |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 27 | struct { |
Namhyung Kim | a3c74c5 | 2010-09-14 21:43:47 +0900 | [diff] [blame] | 28 | u32 __user *uaddr; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 29 | u32 val; |
| 30 | u32 flags; |
Thomas Gleixner | cd68998 | 2008-02-01 17:45:14 +0100 | [diff] [blame] | 31 | u32 bitset; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 32 | u64 time; |
Namhyung Kim | a3c74c5 | 2010-09-14 21:43:47 +0900 | [diff] [blame] | 33 | u32 __user *uaddr2; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 34 | } futex; |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 35 | /* For nanosleep */ |
| 36 | struct { |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 37 | clockid_t clockid; |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 38 | struct timespec __user *rmtp; |
| 39 | #ifdef CONFIG_COMPAT |
| 40 | struct compat_timespec __user *compat_rmtp; |
| 41 | #endif |
| 42 | u64 expires; |
| 43 | } nanosleep; |
Thomas Gleixner | be5dad2 | 2008-08-31 08:19:15 -0700 | [diff] [blame] | 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; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 52 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Kees Cook | 6a19e26 | 2018-04-20 14:55:31 -0700 | [diff] [blame] | 62 | #define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | __GFP_ZERO) |
Thomas Gleixner | 2889f60 | 2012-05-05 15:05:41 +0000 | [diff] [blame] | 63 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | /* |
| 65 | * flag set/clear/test wrappers |
| 66 | * - pass TIF_xxxx constants to these functions |
| 67 | */ |
| 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| 70 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 71 | set_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 75 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 76 | clear_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
| 80 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 81 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 85 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 86 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
| 90 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 91 | return test_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Roman Zippel | 3b66a1e | 2005-11-13 16:06:59 -0800 | [diff] [blame] | 94 | #define set_thread_flag(flag) \ |
| 95 | set_ti_thread_flag(current_thread_info(), flag) |
| 96 | #define clear_thread_flag(flag) \ |
| 97 | clear_ti_thread_flag(current_thread_info(), flag) |
| 98 | #define test_and_set_thread_flag(flag) \ |
| 99 | test_and_set_ti_thread_flag(current_thread_info(), flag) |
| 100 | #define test_and_clear_thread_flag(flag) \ |
| 101 | test_and_clear_ti_thread_flag(current_thread_info(), flag) |
| 102 | #define test_thread_flag(flag) \ |
| 103 | test_ti_thread_flag(current_thread_info(), flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Peter Zijlstra | ea81174 | 2013-09-11 12:43:13 +0200 | [diff] [blame] | 105 | #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
| 106 | |
Kees Cook | 0f60a8e | 2016-07-12 16:19:48 -0700 | [diff] [blame] | 107 | #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
| 108 | static inline int arch_within_stack_frames(const void * const stack, |
| 109 | const void * const stackend, |
| 110 | const void *obj, unsigned long len) |
| 111 | { |
| 112 | return 0; |
| 113 | } |
| 114 | #endif |
| 115 | |
Kees Cook | f5509cc | 2016-06-07 11:05:33 -0700 | [diff] [blame] | 116 | #ifdef CONFIG_HARDENED_USERCOPY |
| 117 | extern void __check_object_size(const void *ptr, unsigned long n, |
| 118 | bool to_user); |
| 119 | |
Kees Cook | a85d6b8 | 2016-09-07 09:39:32 -0700 | [diff] [blame] | 120 | static __always_inline void check_object_size(const void *ptr, unsigned long n, |
| 121 | bool to_user) |
Kees Cook | f5509cc | 2016-06-07 11:05:33 -0700 | [diff] [blame] | 122 | { |
Kees Cook | 81409e9 | 2016-08-31 16:04:21 -0700 | [diff] [blame] | 123 | if (!__builtin_constant_p(n)) |
| 124 | __check_object_size(ptr, n, to_user); |
Kees Cook | f5509cc | 2016-06-07 11:05:33 -0700 | [diff] [blame] | 125 | } |
| 126 | #else |
| 127 | static inline void check_object_size(const void *ptr, unsigned long n, |
| 128 | bool to_user) |
| 129 | { } |
| 130 | #endif /* CONFIG_HARDENED_USERCOPY */ |
| 131 | |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 132 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | |
| 134 | #endif /* _LINUX_THREAD_INFO_H */ |