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 |
| 17 | struct thread_info { |
Mark Rutland | 907241d | 2016-09-23 18:24:07 +0100 | [diff] [blame] | 18 | unsigned long flags; /* low level flags */ |
Andy Lutomirski | c65eacb | 2016-09-13 14:29:24 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | /* |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 32 | * System call restart block. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | */ |
| 34 | struct restart_block { |
| 35 | long (*fn)(struct restart_block *); |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 36 | union { |
Darren Hart | 52400ba | 2009-04-03 13:40:49 -0700 | [diff] [blame] | 37 | /* For futex_wait and futex_wait_requeue_pi */ |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 38 | struct { |
Namhyung Kim | a3c74c5 | 2010-09-14 21:43:47 +0900 | [diff] [blame] | 39 | u32 __user *uaddr; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 40 | u32 val; |
| 41 | u32 flags; |
Thomas Gleixner | cd68998 | 2008-02-01 17:45:14 +0100 | [diff] [blame] | 42 | u32 bitset; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 43 | u64 time; |
Namhyung Kim | a3c74c5 | 2010-09-14 21:43:47 +0900 | [diff] [blame] | 44 | u32 __user *uaddr2; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 45 | } futex; |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 46 | /* For nanosleep */ |
| 47 | struct { |
Thomas Gleixner | ab8177b | 2011-05-20 13:05:15 +0200 | [diff] [blame] | 48 | clockid_t clockid; |
Thomas Gleixner | a332d86 | 2008-02-10 09:04:12 +0100 | [diff] [blame] | 49 | struct timespec __user *rmtp; |
| 50 | #ifdef CONFIG_COMPAT |
| 51 | struct compat_timespec __user *compat_rmtp; |
| 52 | #endif |
| 53 | u64 expires; |
| 54 | } nanosleep; |
Thomas Gleixner | be5dad2 | 2008-08-31 08:19:15 -0700 | [diff] [blame] | 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; |
Steven Rostedt | ce6bd42 | 2007-12-05 15:46:09 +0100 | [diff] [blame] | 63 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | }; |
| 65 | |
| 66 | extern 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 | |
Thomas Gleixner | 2889f60 | 2012-05-05 15:05:41 +0000 | [diff] [blame] | 73 | #ifdef CONFIG_DEBUG_STACK_USAGE |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 74 | # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ |
| 75 | __GFP_ZERO) |
Thomas Gleixner | 2889f60 | 2012-05-05 15:05:41 +0000 | [diff] [blame] | 76 | #else |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 77 | # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) |
Thomas Gleixner | 2889f60 | 2012-05-05 15:05:41 +0000 | [diff] [blame] | 78 | #endif |
| 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | /* |
| 81 | * flag set/clear/test wrappers |
| 82 | * - pass TIF_xxxx constants to these functions |
| 83 | */ |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| 86 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 87 | set_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
| 90 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 91 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 92 | clear_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
| 96 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 97 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 101 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 102 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | } |
| 104 | |
| 105 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
| 106 | { |
Jeremy Fitzhardinge | 5548fec | 2008-01-30 13:30:55 +0100 | [diff] [blame] | 107 | return test_bit(flag, (unsigned long *)&ti->flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Roman Zippel | 3b66a1e | 2005-11-13 16:06:59 -0800 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Peter Zijlstra | ea81174 | 2013-09-11 12:43:13 +0200 | [diff] [blame] | 121 | #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
| 122 | |
Kees Cook | 0f60a8e | 2016-07-12 16:19:48 -0700 | [diff] [blame] | 123 | #ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES |
| 124 | static 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 | |
Kees Cook | f5509cc | 2016-06-07 11:05:33 -0700 | [diff] [blame] | 132 | #ifdef CONFIG_HARDENED_USERCOPY |
| 133 | extern void __check_object_size(const void *ptr, unsigned long n, |
| 134 | bool to_user); |
| 135 | |
Kees Cook | a85d6b8 | 2016-09-07 09:39:32 -0700 | [diff] [blame] | 136 | static __always_inline void check_object_size(const void *ptr, unsigned long n, |
| 137 | bool to_user) |
Kees Cook | f5509cc | 2016-06-07 11:05:33 -0700 | [diff] [blame] | 138 | { |
Kees Cook | 81409e9 | 2016-08-31 16:04:21 -0700 | [diff] [blame] | 139 | if (!__builtin_constant_p(n)) |
| 140 | __check_object_size(ptr, n, to_user); |
Kees Cook | f5509cc | 2016-06-07 11:05:33 -0700 | [diff] [blame] | 141 | } |
| 142 | #else |
| 143 | static inline void check_object_size(const void *ptr, unsigned long n, |
| 144 | bool to_user) |
| 145 | { } |
| 146 | #endif /* CONFIG_HARDENED_USERCOPY */ |
| 147 | |
Roland McGrath | 4e4c22c | 2008-04-30 00:53:06 -0700 | [diff] [blame] | 148 | #endif /* __KERNEL__ */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
| 150 | #endif /* _LINUX_THREAD_INFO_H */ |