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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> |
60063497 | 24 | #include <linux/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 |
bccd1729 AV |
43 | unsigned int sig_on_uaccess_error:1; |
44 | unsigned int uaccess_err:1; /* uaccess failed */ | |
2052e8d4 | 45 | }; |
3351cc03 CL |
46 | |
47 | #define INIT_THREAD_INFO(tsk) \ | |
48 | { \ | |
49 | .task = &tsk, \ | |
50 | .exec_domain = &default_exec_domain, \ | |
51 | .flags = 0, \ | |
52 | .cpu = 0, \ | |
c99e6efe | 53 | .preempt_count = INIT_PREEMPT_COUNT, \ |
3351cc03 CL |
54 | .addr_limit = KERNEL_DS, \ |
55 | .restart_block = { \ | |
56 | .fn = do_no_restart_syscall, \ | |
57 | }, \ | |
58 | } | |
59 | ||
60 | #define init_thread_info (init_thread_union.thread_info) | |
61 | #define init_stack (init_thread_union.stack) | |
62 | ||
2052e8d4 CL |
63 | #else /* !__ASSEMBLY__ */ |
64 | ||
65 | #include <asm/asm-offsets.h> | |
66 | ||
67 | #endif | |
68 | ||
e57549b0 CL |
69 | /* |
70 | * thread information flags | |
71 | * - these are process state flags that various assembly files | |
72 | * may need to access | |
73 | * - pending work-to-be-done flags are in LSW | |
74 | * - other flags in MSW | |
75 | * Warning: layout of LSW is hardcoded in entry.S | |
76 | */ | |
77 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
59e52130 | 78 | #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ |
e57549b0 CL |
79 | #define TIF_SIGPENDING 2 /* signal pending */ |
80 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
81 | #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ | |
82 | #define TIF_IRET 5 /* force IRET */ | |
e57549b0 | 83 | #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ |
e57549b0 CL |
84 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ |
85 | #define TIF_SECCOMP 8 /* secure computing */ | |
e57549b0 | 86 | #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */ |
7c68af6e | 87 | #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ |
e57549b0 | 88 | #define TIF_NOTSC 16 /* TSC is not accessible in userland */ |
6bd33008 | 89 | #define TIF_IA32 17 /* IA32 compatibility process */ |
e57549b0 | 90 | #define TIF_FORK 18 /* ret_from_fork */ |
0ddc9324 | 91 | #define TIF_MEMDIE 20 /* is terminating due to OOM killer */ |
e57549b0 CL |
92 | #define TIF_DEBUG 21 /* uses debug registers */ |
93 | #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ | |
e57549b0 | 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 */ |
6bd33008 | 98 | #define TIF_ADDR32 29 /* 32-bit address space on 64 bits */ |
bb212724 | 99 | #define TIF_X32 30 /* 32-bit native x86-64 binary */ |
e57549b0 CL |
100 | |
101 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) | |
59e52130 | 102 | #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
e57549b0 CL |
103 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
104 | #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) | |
105 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
106 | #define _TIF_IRET (1 << TIF_IRET) | |
e57549b0 | 107 | #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) |
e57549b0 CL |
108 | #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
109 | #define _TIF_SECCOMP (1 << TIF_SECCOMP) | |
e57549b0 | 110 | #define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY) |
7c68af6e | 111 | #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) |
e57549b0 CL |
112 | #define _TIF_NOTSC (1 << TIF_NOTSC) |
113 | #define _TIF_IA32 (1 << TIF_IA32) | |
114 | #define _TIF_FORK (1 << TIF_FORK) | |
e57549b0 CL |
115 | #define _TIF_DEBUG (1 << TIF_DEBUG) |
116 | #define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) | |
e57549b0 | 117 | #define _TIF_FORCED_TF (1 << TIF_FORCED_TF) |
ea8e61b7 | 118 | #define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP) |
b407fc57 | 119 | #define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES) |
66700001 | 120 | #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) |
6bd33008 | 121 | #define _TIF_ADDR32 (1 << TIF_ADDR32) |
bb212724 | 122 | #define _TIF_X32 (1 << TIF_X32) |
e57549b0 | 123 | |
d4d67150 RM |
124 | /* work to do in syscall_trace_enter() */ |
125 | #define _TIF_WORK_SYSCALL_ENTRY \ | |
66700001 JS |
126 | (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \ |
127 | _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT) | |
d4d67150 RM |
128 | |
129 | /* work to do in syscall_trace_leave() */ | |
130 | #define _TIF_WORK_SYSCALL_EXIT \ | |
1b3fa2ce | 131 | (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \ |
66700001 | 132 | _TIF_SYSCALL_TRACEPOINT) |
d4d67150 | 133 | |
00c1bb13 CL |
134 | /* work to do on interrupt/exception return */ |
135 | #define _TIF_WORK_MASK \ | |
136 | (0x0000FFFF & \ | |
64f09733 | 137 | ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \ |
d4d67150 | 138 | _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU)) |
00c1bb13 CL |
139 | |
140 | /* work to do on any return to user space */ | |
66700001 JS |
141 | #define _TIF_ALLWORK_MASK \ |
142 | ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT) | |
00c1bb13 | 143 | |
b84200b3 | 144 | /* Only used for 64 bit */ |
00c1bb13 | 145 | #define _TIF_DO_NOTIFY_MASK \ |
7c68af6e AK |
146 | (_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME | \ |
147 | _TIF_USER_RETURN_NOTIFY) | |
00c1bb13 CL |
148 | |
149 | /* flags to check in __switch_to() */ | |
150 | #define _TIF_WORK_CTXSW \ | |
ea8e61b7 | 151 | (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP) |
00c1bb13 | 152 | |
7c68af6e | 153 | #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) |
00c1bb13 CL |
154 | #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG) |
155 | ||
24e2de6e CL |
156 | #define PREEMPT_ACTIVE 0x10000000 |
157 | ||
b84200b3 CL |
158 | /* thread information allocation */ |
159 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
b1eeab67 | 160 | #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO) |
96a388de | 161 | #else |
b1eeab67 | 162 | #define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK) |
96a388de | 163 | #endif |
61c4628b | 164 | |
b69c49b7 FT |
165 | #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
166 | ||
b6a84016 ED |
167 | #define alloc_thread_info_node(tsk, node) \ |
168 | ({ \ | |
169 | struct page *page = alloc_pages_node(node, THREAD_FLAGS, \ | |
170 | THREAD_ORDER); \ | |
171 | struct thread_info *ret = page ? page_address(page) : NULL; \ | |
172 | \ | |
173 | ret; \ | |
174 | }) | |
b84200b3 CL |
175 | |
176 | #ifdef CONFIG_X86_32 | |
177 | ||
178 | #define STACK_WARN (THREAD_SIZE/8) | |
2052e8d4 CL |
179 | /* |
180 | * macros/functions for gaining access to the thread information structure | |
181 | * | |
182 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
183 | */ | |
184 | #ifndef __ASSEMBLY__ | |
185 | ||
2052e8d4 CL |
186 | |
187 | /* how to get the current stack pointer from C */ | |
188 | register unsigned long current_stack_pointer asm("esp") __used; | |
189 | ||
190 | /* how to get the thread information struct from C */ | |
191 | static inline struct thread_info *current_thread_info(void) | |
192 | { | |
193 | return (struct thread_info *) | |
194 | (current_stack_pointer & ~(THREAD_SIZE - 1)); | |
195 | } | |
196 | ||
2052e8d4 CL |
197 | #else /* !__ASSEMBLY__ */ |
198 | ||
199 | /* how to get the thread information struct from ASM */ | |
200 | #define GET_THREAD_INFO(reg) \ | |
201 | movl $-THREAD_SIZE, reg; \ | |
202 | andl %esp, reg | |
203 | ||
204 | /* use this one if reg already contains %esp */ | |
205 | #define GET_THREAD_INFO_WITH_ESP(reg) \ | |
206 | andl $-THREAD_SIZE, reg | |
207 | ||
208 | #endif | |
209 | ||
2052e8d4 CL |
210 | #else /* X86_32 */ |
211 | ||
9af45651 BG |
212 | #include <asm/percpu.h> |
213 | #define KERNEL_STACK_OFFSET (5*8) | |
2052e8d4 | 214 | |
2052e8d4 CL |
215 | /* |
216 | * macros/functions for gaining access to the thread information structure | |
217 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
218 | */ | |
219 | #ifndef __ASSEMBLY__ | |
9af45651 | 220 | DECLARE_PER_CPU(unsigned long, kernel_stack); |
2052e8d4 | 221 | |
9af45651 | 222 | static inline struct thread_info *current_thread_info(void) |
2052e8d4 CL |
223 | { |
224 | struct thread_info *ti; | |
ed8d9adf | 225 | ti = (void *)(percpu_read_stable(kernel_stack) + |
9af45651 | 226 | KERNEL_STACK_OFFSET - THREAD_SIZE); |
2052e8d4 CL |
227 | return ti; |
228 | } | |
229 | ||
2052e8d4 CL |
230 | #else /* !__ASSEMBLY__ */ |
231 | ||
232 | /* how to get the thread information struct from ASM */ | |
233 | #define GET_THREAD_INFO(reg) \ | |
9af45651 BG |
234 | movq PER_CPU_VAR(kernel_stack),reg ; \ |
235 | subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg | |
2052e8d4 | 236 | |
46db09d3 JB |
237 | /* |
238 | * Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in | |
239 | * a certain register (to be used in assembler memory operands). | |
240 | */ | |
241 | #define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg) | |
242 | ||
2052e8d4 CL |
243 | #endif |
244 | ||
f2ea3b1d CL |
245 | #endif /* !X86_32 */ |
246 | ||
2052e8d4 CL |
247 | /* |
248 | * Thread-synchronous status. | |
249 | * | |
250 | * This is different from the flags in that nobody else | |
251 | * ever touches our thread-synchronous status, so we don't | |
252 | * have to worry about atomic accesses. | |
253 | */ | |
f2ea3b1d | 254 | #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ |
e45b7fa2 LB |
255 | #define TS_POLLING 0x0004 /* idle task polling need_resched, |
256 | skip sending interrupt */ | |
8a6c160a | 257 | #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ |
2052e8d4 CL |
258 | |
259 | #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) | |
260 | ||
8a6c160a IM |
261 | #ifndef __ASSEMBLY__ |
262 | #define HAVE_SET_RESTORE_SIGMASK 1 | |
263 | static inline void set_restore_sigmask(void) | |
264 | { | |
265 | struct thread_info *ti = current_thread_info(); | |
266 | ti->status |= TS_RESTORE_SIGMASK; | |
3711ccb0 | 267 | set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags); |
8a6c160a | 268 | } |
ef334a20 SD |
269 | |
270 | static inline bool is_ia32_task(void) | |
271 | { | |
272 | #ifdef CONFIG_X86_32 | |
273 | return true; | |
274 | #endif | |
275 | #ifdef CONFIG_IA32_EMULATION | |
276 | if (current_thread_info()->status & TS_COMPAT) | |
277 | return true; | |
278 | #endif | |
279 | return false; | |
280 | } | |
8a6c160a IM |
281 | #endif /* !__ASSEMBLY__ */ |
282 | ||
61c4628b SS |
283 | #ifndef __ASSEMBLY__ |
284 | extern void arch_task_cache_init(void); | |
285 | extern void free_thread_info(struct thread_info *ti); | |
286 | extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); | |
287 | #endif | |
1965aae3 | 288 | #endif /* _ASM_X86_THREAD_INFO_H */ |