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2052e8d4 CL |
1 | /* thread_info.h: low-level thread information |
2 | * | |
3 | * Copyright (C) 2002 David Howells (dhowells@redhat.com) | |
4 | * - Incorporating suggestions made by Linus Torvalds and Dave Miller | |
5 | */ | |
6 | ||
1965aae3 PA |
7 | #ifndef _ASM_X86_THREAD_INFO_H |
8 | #define _ASM_X86_THREAD_INFO_H | |
2052e8d4 | 9 | |
2052e8d4 CL |
10 | #include <linux/compiler.h> |
11 | #include <asm/page.h> | |
12a638e1 CL |
12 | #include <asm/types.h> |
13 | ||
2052e8d4 CL |
14 | /* |
15 | * low level task data that entry.S needs immediate access to | |
16 | * - this struct should fit entirely inside of one cache line | |
17 | * - this struct shares the supervisor stack pages | |
2052e8d4 CL |
18 | */ |
19 | #ifndef __ASSEMBLY__ | |
006c484b CL |
20 | struct task_struct; |
21 | struct exec_domain; | |
22 | #include <asm/processor.h> | |
caf4b323 | 23 | #include <asm/ftrace.h> |
0231022c | 24 | #include <asm/atomic.h> |
2052e8d4 CL |
25 | |
26 | struct thread_info { | |
27 | struct task_struct *task; /* main task structure */ | |
28 | struct exec_domain *exec_domain; /* execution domain */ | |
affa219b | 29 | __u32 flags; /* low level flags */ |
006c484b | 30 | __u32 status; /* thread synchronous flags */ |
2052e8d4 | 31 | __u32 cpu; /* current CPU */ |
dedd4915 | 32 | int preempt_count; /* 0 => preemptable, |
2052e8d4 | 33 | <0 => BUG */ |
006c484b | 34 | mm_segment_t addr_limit; |
2052e8d4 | 35 | struct restart_block restart_block; |
006c484b CL |
36 | void __user *sysenter_return; |
37 | #ifdef CONFIG_X86_32 | |
2052e8d4 CL |
38 | unsigned long previous_esp; /* ESP of the previous stack in |
39 | case of nested (IRQ) stacks | |
40 | */ | |
41 | __u8 supervisor_stack[0]; | |
006c484b | 42 | #endif |
fe40c0af | 43 | int uaccess_err; |
2052e8d4 | 44 | }; |
3351cc03 CL |
45 | |
46 | #define INIT_THREAD_INFO(tsk) \ | |
47 | { \ | |
48 | .task = &tsk, \ | |
49 | .exec_domain = &default_exec_domain, \ | |
50 | .flags = 0, \ | |
51 | .cpu = 0, \ | |
c99e6efe | 52 | .preempt_count = INIT_PREEMPT_COUNT, \ |
3351cc03 CL |
53 | .addr_limit = KERNEL_DS, \ |
54 | .restart_block = { \ | |
55 | .fn = do_no_restart_syscall, \ | |
56 | }, \ | |
57 | } | |
58 | ||
59 | #define init_thread_info (init_thread_union.thread_info) | |
60 | #define init_stack (init_thread_union.stack) | |
61 | ||
2052e8d4 CL |
62 | #else /* !__ASSEMBLY__ */ |
63 | ||
64 | #include <asm/asm-offsets.h> | |
65 | ||
66 | #endif | |
67 | ||
e57549b0 CL |
68 | /* |
69 | * thread information flags | |
70 | * - these are process state flags that various assembly files | |
71 | * may need to access | |
72 | * - pending work-to-be-done flags are in LSW | |
73 | * - other flags in MSW | |
74 | * Warning: layout of LSW is hardcoded in entry.S | |
75 | */ | |
76 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
59e52130 | 77 | #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ |
e57549b0 CL |
78 | #define TIF_SIGPENDING 2 /* signal pending */ |
79 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
80 | #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ | |
81 | #define TIF_IRET 5 /* force IRET */ | |
e57549b0 | 82 | #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ |
e57549b0 CL |
83 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ |
84 | #define TIF_SECCOMP 8 /* secure computing */ | |
e57549b0 | 85 | #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */ |
7c68af6e | 86 | #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ |
e57549b0 CL |
87 | #define TIF_NOTSC 16 /* TSC is not accessible in userland */ |
88 | #define TIF_IA32 17 /* 32bit process */ | |
89 | #define TIF_FORK 18 /* ret_from_fork */ | |
0ddc9324 | 90 | #define TIF_MEMDIE 20 /* is terminating due to OOM killer */ |
e57549b0 CL |
91 | #define TIF_DEBUG 21 /* uses debug registers */ |
92 | #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ | |
93 | #define TIF_FREEZE 23 /* is freezing for suspend */ | |
94 | #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ | |
ea8e61b7 | 95 | #define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */ |
b407fc57 | 96 | #define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */ |
66700001 | 97 | #define TIF_SYSCALL_TRACEPOINT 28 /* syscall tracepoint instrumentation */ |
e57549b0 CL |
98 | |
99 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) | |
59e52130 | 100 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
e57549b0 CL |
101 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
102 | #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) | |
103 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
104 | #define _TIF_IRET (1 << TIF_IRET) | |
e57549b0 | 105 | #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) |
e57549b0 CL |
106 | #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
107 | #define _TIF_SECCOMP (1 << TIF_SECCOMP) | |
e57549b0 | 108 | #define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY) |
7c68af6e | 109 | #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) |
e57549b0 CL |
110 | #define _TIF_NOTSC (1 << TIF_NOTSC) |
111 | #define _TIF_IA32 (1 << TIF_IA32) | |
112 | #define _TIF_FORK (1 << TIF_FORK) | |
e57549b0 CL |
113 | #define _TIF_DEBUG (1 << TIF_DEBUG) |
114 | #define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) | |
115 | #define _TIF_FREEZE (1 << TIF_FREEZE) | |
116 | #define _TIF_FORCED_TF (1 << TIF_FORCED_TF) | |
ea8e61b7 | 117 | #define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP) |
b407fc57 | 118 | #define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES) |
66700001 | 119 | #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) |
e57549b0 | 120 | |
d4d67150 RM |
121 | /* work to do in syscall_trace_enter() */ |
122 | #define _TIF_WORK_SYSCALL_ENTRY \ | |
66700001 JS |
123 | (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \ |
124 | _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT) | |
d4d67150 RM |
125 | |
126 | /* work to do in syscall_trace_leave() */ | |
127 | #define _TIF_WORK_SYSCALL_EXIT \ | |
1b3fa2ce | 128 | (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \ |
66700001 | 129 | _TIF_SYSCALL_TRACEPOINT) |
d4d67150 | 130 | |
00c1bb13 CL |
131 | /* work to do on interrupt/exception return */ |
132 | #define _TIF_WORK_MASK \ | |
133 | (0x0000FFFF & \ | |
64f09733 | 134 | ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \ |
d4d67150 | 135 | _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU)) |
00c1bb13 CL |
136 | |
137 | /* work to do on any return to user space */ | |
66700001 JS |
138 | #define _TIF_ALLWORK_MASK \ |
139 | ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT) | |
00c1bb13 | 140 | |
b84200b3 | 141 | /* Only used for 64 bit */ |
00c1bb13 | 142 | #define _TIF_DO_NOTIFY_MASK \ |
7c68af6e AK |
143 | (_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME | \ |
144 | _TIF_USER_RETURN_NOTIFY) | |
00c1bb13 CL |
145 | |
146 | /* flags to check in __switch_to() */ | |
147 | #define _TIF_WORK_CTXSW \ | |
ea8e61b7 | 148 | (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP) |
00c1bb13 | 149 | |
7c68af6e | 150 | #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) |
00c1bb13 CL |
151 | #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG) |
152 | ||
24e2de6e CL |
153 | #define PREEMPT_ACTIVE 0x10000000 |
154 | ||
b84200b3 CL |
155 | /* thread information allocation */ |
156 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
b1eeab67 | 157 | #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO) |
96a388de | 158 | #else |
b1eeab67 | 159 | #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK) |
96a388de | 160 | #endif |
61c4628b | 161 | |
b69c49b7 FT |
162 | #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
163 | ||
b6a84016 ED |
164 | #define alloc_thread_info_node(tsk, node) \ |
165 | ({ \ | |
166 | struct page *page = alloc_pages_node(node, THREAD_FLAGS, \ | |
167 | THREAD_ORDER); \ | |
168 | struct thread_info *ret = page ? page_address(page) : NULL; \ | |
169 | \ | |
170 | ret; \ | |
171 | }) | |
b84200b3 CL |
172 | |
173 | #ifdef CONFIG_X86_32 | |
174 | ||
175 | #define STACK_WARN (THREAD_SIZE/8) | |
2052e8d4 CL |
176 | /* |
177 | * macros/functions for gaining access to the thread information structure | |
178 | * | |
179 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
180 | */ | |
181 | #ifndef __ASSEMBLY__ | |
182 | ||
2052e8d4 CL |
183 | |
184 | /* how to get the current stack pointer from C */ | |
185 | register unsigned long current_stack_pointer asm("esp") __used; | |
186 | ||
187 | /* how to get the thread information struct from C */ | |
188 | static inline struct thread_info *current_thread_info(void) | |
189 | { | |
190 | return (struct thread_info *) | |
191 | (current_stack_pointer & ~(THREAD_SIZE - 1)); | |
192 | } | |
193 | ||
2052e8d4 CL |
194 | #else /* !__ASSEMBLY__ */ |
195 | ||
196 | /* how to get the thread information struct from ASM */ | |
197 | #define GET_THREAD_INFO(reg) \ | |
198 | movl $-THREAD_SIZE, reg; \ | |
199 | andl %esp, reg | |
200 | ||
201 | /* use this one if reg already contains %esp */ | |
202 | #define GET_THREAD_INFO_WITH_ESP(reg) \ | |
203 | andl $-THREAD_SIZE, reg | |
204 | ||
205 | #endif | |
206 | ||
2052e8d4 CL |
207 | #else /* X86_32 */ |
208 | ||
9af45651 BG |
209 | #include <asm/percpu.h> |
210 | #define KERNEL_STACK_OFFSET (5*8) | |
2052e8d4 | 211 | |
2052e8d4 CL |
212 | /* |
213 | * macros/functions for gaining access to the thread information structure | |
214 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
215 | */ | |
216 | #ifndef __ASSEMBLY__ | |
9af45651 | 217 | DECLARE_PER_CPU(unsigned long, kernel_stack); |
2052e8d4 | 218 | |
9af45651 | 219 | static inline struct thread_info *current_thread_info(void) |
2052e8d4 CL |
220 | { |
221 | struct thread_info *ti; | |
ed8d9adf | 222 | ti = (void *)(percpu_read_stable(kernel_stack) + |
9af45651 | 223 | KERNEL_STACK_OFFSET - THREAD_SIZE); |
2052e8d4 CL |
224 | return ti; |
225 | } | |
226 | ||
2052e8d4 CL |
227 | #else /* !__ASSEMBLY__ */ |
228 | ||
229 | /* how to get the thread information struct from ASM */ | |
230 | #define GET_THREAD_INFO(reg) \ | |
9af45651 BG |
231 | movq PER_CPU_VAR(kernel_stack),reg ; \ |
232 | subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg | |
2052e8d4 CL |
233 | |
234 | #endif | |
235 | ||
f2ea3b1d CL |
236 | #endif /* !X86_32 */ |
237 | ||
2052e8d4 CL |
238 | /* |
239 | * Thread-synchronous status. | |
240 | * | |
241 | * This is different from the flags in that nobody else | |
242 | * ever touches our thread-synchronous status, so we don't | |
243 | * have to worry about atomic accesses. | |
244 | */ | |
245 | #define TS_USEDFPU 0x0001 /* FPU was used by this task | |
246 | this quantum (SMP) */ | |
f2ea3b1d | 247 | #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ |
e45b7fa2 LB |
248 | #define TS_POLLING 0x0004 /* idle task polling need_resched, |
249 | skip sending interrupt */ | |
8a6c160a | 250 | #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ |
2052e8d4 CL |
251 | |
252 | #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) | |
253 | ||
8a6c160a IM |
254 | #ifndef __ASSEMBLY__ |
255 | #define HAVE_SET_RESTORE_SIGMASK 1 | |
256 | static inline void set_restore_sigmask(void) | |
257 | { | |
258 | struct thread_info *ti = current_thread_info(); | |
259 | ti->status |= TS_RESTORE_SIGMASK; | |
3711ccb0 | 260 | set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags); |
8a6c160a IM |
261 | } |
262 | #endif /* !__ASSEMBLY__ */ | |
263 | ||
61c4628b SS |
264 | #ifndef __ASSEMBLY__ |
265 | extern void arch_task_cache_init(void); | |
266 | extern void free_thread_info(struct thread_info *ti); | |
267 | extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); | |
2adee9b3 | 268 | #define arch_task_cache_init arch_task_cache_init |
61c4628b | 269 | #endif |
1965aae3 | 270 | #endif /* _ASM_X86_THREAD_INFO_H */ |