Commit | Line | Data |
---|---|---|
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 | ||
61c4628b | 7 | #ifndef _ASM_X86_THREAD_INFO_H |
2052e8d4 CL |
8 | #define _ASM_X86_THREAD_INFO_H |
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> | |
2052e8d4 CL |
23 | |
24 | struct thread_info { | |
25 | struct task_struct *task; /* main task structure */ | |
26 | struct exec_domain *exec_domain; /* execution domain */ | |
dedd4915 | 27 | unsigned long flags; /* low level flags */ |
006c484b | 28 | __u32 status; /* thread synchronous flags */ |
2052e8d4 | 29 | __u32 cpu; /* current CPU */ |
dedd4915 | 30 | int preempt_count; /* 0 => preemptable, |
2052e8d4 | 31 | <0 => BUG */ |
006c484b | 32 | mm_segment_t addr_limit; |
2052e8d4 | 33 | struct restart_block restart_block; |
006c484b CL |
34 | void __user *sysenter_return; |
35 | #ifdef CONFIG_X86_32 | |
2052e8d4 CL |
36 | unsigned long previous_esp; /* ESP of the previous stack in |
37 | case of nested (IRQ) stacks | |
38 | */ | |
39 | __u8 supervisor_stack[0]; | |
006c484b | 40 | #endif |
2052e8d4 | 41 | }; |
3351cc03 CL |
42 | |
43 | #define INIT_THREAD_INFO(tsk) \ | |
44 | { \ | |
45 | .task = &tsk, \ | |
46 | .exec_domain = &default_exec_domain, \ | |
47 | .flags = 0, \ | |
48 | .cpu = 0, \ | |
49 | .preempt_count = 1, \ | |
50 | .addr_limit = KERNEL_DS, \ | |
51 | .restart_block = { \ | |
52 | .fn = do_no_restart_syscall, \ | |
53 | }, \ | |
54 | } | |
55 | ||
56 | #define init_thread_info (init_thread_union.thread_info) | |
57 | #define init_stack (init_thread_union.stack) | |
58 | ||
2052e8d4 CL |
59 | #else /* !__ASSEMBLY__ */ |
60 | ||
61 | #include <asm/asm-offsets.h> | |
62 | ||
63 | #endif | |
64 | ||
e57549b0 CL |
65 | /* |
66 | * thread information flags | |
67 | * - these are process state flags that various assembly files | |
68 | * may need to access | |
69 | * - pending work-to-be-done flags are in LSW | |
70 | * - other flags in MSW | |
71 | * Warning: layout of LSW is hardcoded in entry.S | |
72 | */ | |
73 | #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ | |
74 | #define TIF_SIGPENDING 2 /* signal pending */ | |
75 | #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ | |
76 | #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ | |
77 | #define TIF_IRET 5 /* force IRET */ | |
e57549b0 | 78 | #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ |
e57549b0 CL |
79 | #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ |
80 | #define TIF_SECCOMP 8 /* secure computing */ | |
e57549b0 | 81 | #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */ |
e57549b0 CL |
82 | #define TIF_NOTSC 16 /* TSC is not accessible in userland */ |
83 | #define TIF_IA32 17 /* 32bit process */ | |
84 | #define TIF_FORK 18 /* ret_from_fork */ | |
85 | #define TIF_ABI_PENDING 19 | |
86 | #define TIF_MEMDIE 20 | |
87 | #define TIF_DEBUG 21 /* uses debug registers */ | |
88 | #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ | |
89 | #define TIF_FREEZE 23 /* is freezing for suspend */ | |
90 | #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ | |
91 | #define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */ | |
92 | #define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */ | |
93 | #define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */ | |
94 | ||
95 | #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) | |
96 | #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) | |
97 | #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) | |
98 | #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) | |
99 | #define _TIF_IRET (1 << TIF_IRET) | |
e57549b0 | 100 | #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) |
e57549b0 CL |
101 | #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) |
102 | #define _TIF_SECCOMP (1 << TIF_SECCOMP) | |
e57549b0 | 103 | #define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY) |
e57549b0 CL |
104 | #define _TIF_NOTSC (1 << TIF_NOTSC) |
105 | #define _TIF_IA32 (1 << TIF_IA32) | |
106 | #define _TIF_FORK (1 << TIF_FORK) | |
107 | #define _TIF_ABI_PENDING (1 << TIF_ABI_PENDING) | |
108 | #define _TIF_DEBUG (1 << TIF_DEBUG) | |
109 | #define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) | |
110 | #define _TIF_FREEZE (1 << TIF_FREEZE) | |
111 | #define _TIF_FORCED_TF (1 << TIF_FORCED_TF) | |
112 | #define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR) | |
113 | #define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR) | |
114 | #define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS) | |
115 | ||
d4d67150 RM |
116 | /* work to do in syscall_trace_enter() */ |
117 | #define _TIF_WORK_SYSCALL_ENTRY \ | |
118 | (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | \ | |
380fdd75 | 119 | _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | _TIF_SINGLESTEP) |
d4d67150 RM |
120 | |
121 | /* work to do in syscall_trace_leave() */ | |
122 | #define _TIF_WORK_SYSCALL_EXIT \ | |
123 | (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP) | |
124 | ||
00c1bb13 CL |
125 | /* work to do on interrupt/exception return */ |
126 | #define _TIF_WORK_MASK \ | |
127 | (0x0000FFFF & \ | |
64f09733 | 128 | ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \ |
d4d67150 | 129 | _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU)) |
00c1bb13 CL |
130 | |
131 | /* work to do on any return to user space */ | |
132 | #define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP) | |
133 | ||
b84200b3 | 134 | /* Only used for 64 bit */ |
00c1bb13 | 135 | #define _TIF_DO_NOTIFY_MASK \ |
7f9dce38 | 136 | (_TIF_SIGPENDING|_TIF_MCE_NOTIFY) |
00c1bb13 CL |
137 | |
138 | /* flags to check in __switch_to() */ | |
139 | #define _TIF_WORK_CTXSW \ | |
140 | (_TIF_IO_BITMAP|_TIF_DEBUGCTLMSR|_TIF_DS_AREA_MSR|_TIF_BTS_TRACE_TS| \ | |
141 | _TIF_NOTSC) | |
142 | ||
143 | #define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW | |
144 | #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG) | |
145 | ||
24e2de6e CL |
146 | #define PREEMPT_ACTIVE 0x10000000 |
147 | ||
b84200b3 CL |
148 | /* thread information allocation */ |
149 | #ifdef CONFIG_DEBUG_STACK_USAGE | |
150 | #define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO) | |
96a388de | 151 | #else |
b84200b3 | 152 | #define THREAD_FLAGS GFP_KERNEL |
96a388de | 153 | #endif |
61c4628b | 154 | |
b69c49b7 FT |
155 | #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR |
156 | ||
b84200b3 CL |
157 | #define alloc_thread_info(tsk) \ |
158 | ((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER)) | |
159 | ||
160 | #ifdef CONFIG_X86_32 | |
161 | ||
162 | #define STACK_WARN (THREAD_SIZE/8) | |
2052e8d4 CL |
163 | /* |
164 | * macros/functions for gaining access to the thread information structure | |
165 | * | |
166 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
167 | */ | |
168 | #ifndef __ASSEMBLY__ | |
169 | ||
2052e8d4 CL |
170 | |
171 | /* how to get the current stack pointer from C */ | |
172 | register unsigned long current_stack_pointer asm("esp") __used; | |
173 | ||
174 | /* how to get the thread information struct from C */ | |
175 | static inline struct thread_info *current_thread_info(void) | |
176 | { | |
177 | return (struct thread_info *) | |
178 | (current_stack_pointer & ~(THREAD_SIZE - 1)); | |
179 | } | |
180 | ||
2052e8d4 CL |
181 | #else /* !__ASSEMBLY__ */ |
182 | ||
183 | /* how to get the thread information struct from ASM */ | |
184 | #define GET_THREAD_INFO(reg) \ | |
185 | movl $-THREAD_SIZE, reg; \ | |
186 | andl %esp, reg | |
187 | ||
188 | /* use this one if reg already contains %esp */ | |
189 | #define GET_THREAD_INFO_WITH_ESP(reg) \ | |
190 | andl $-THREAD_SIZE, reg | |
191 | ||
192 | #endif | |
193 | ||
2052e8d4 CL |
194 | #else /* X86_32 */ |
195 | ||
2052e8d4 CL |
196 | #include <asm/pda.h> |
197 | ||
2052e8d4 CL |
198 | /* |
199 | * macros/functions for gaining access to the thread information structure | |
200 | * preempt_count needs to be 1 initially, until the scheduler is functional. | |
201 | */ | |
202 | #ifndef __ASSEMBLY__ | |
2052e8d4 CL |
203 | static inline struct thread_info *current_thread_info(void) |
204 | { | |
205 | struct thread_info *ti; | |
206 | ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE); | |
207 | return ti; | |
208 | } | |
209 | ||
210 | /* do not use in interrupt context */ | |
211 | static inline struct thread_info *stack_thread_info(void) | |
212 | { | |
213 | struct thread_info *ti; | |
214 | asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1))); | |
215 | return ti; | |
216 | } | |
217 | ||
2052e8d4 CL |
218 | #else /* !__ASSEMBLY__ */ |
219 | ||
220 | /* how to get the thread information struct from ASM */ | |
221 | #define GET_THREAD_INFO(reg) \ | |
222 | movq %gs:pda_kernelstack,reg ; \ | |
223 | subq $(THREAD_SIZE-PDA_STACKOFFSET),reg | |
224 | ||
225 | #endif | |
226 | ||
f2ea3b1d CL |
227 | #endif /* !X86_32 */ |
228 | ||
2052e8d4 CL |
229 | /* |
230 | * Thread-synchronous status. | |
231 | * | |
232 | * This is different from the flags in that nobody else | |
233 | * ever touches our thread-synchronous status, so we don't | |
234 | * have to worry about atomic accesses. | |
235 | */ | |
236 | #define TS_USEDFPU 0x0001 /* FPU was used by this task | |
237 | this quantum (SMP) */ | |
f2ea3b1d | 238 | #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ |
2052e8d4 CL |
239 | #define TS_POLLING 0x0004 /* true if in idle loop |
240 | and not sleeping */ | |
8a6c160a | 241 | #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ |
2052e8d4 CL |
242 | |
243 | #define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING) | |
244 | ||
8a6c160a IM |
245 | #ifndef __ASSEMBLY__ |
246 | #define HAVE_SET_RESTORE_SIGMASK 1 | |
247 | static inline void set_restore_sigmask(void) | |
248 | { | |
249 | struct thread_info *ti = current_thread_info(); | |
250 | ti->status |= TS_RESTORE_SIGMASK; | |
3711ccb0 | 251 | set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags); |
8a6c160a IM |
252 | } |
253 | #endif /* !__ASSEMBLY__ */ | |
254 | ||
61c4628b SS |
255 | #ifndef __ASSEMBLY__ |
256 | extern void arch_task_cache_init(void); | |
257 | extern void free_thread_info(struct thread_info *ti); | |
258 | extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); | |
2adee9b3 | 259 | #define arch_task_cache_init arch_task_cache_init |
61c4628b SS |
260 | #endif |
261 | #endif /* _ASM_X86_THREAD_INFO_H */ |