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Linux/arch/x86/include/asm/thread_info.h

  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 
  7 #ifndef _ASM_X86_THREAD_INFO_H
  8 #define _ASM_X86_THREAD_INFO_H
  9 
 10 #include <linux/compiler.h>
 11 #include <asm/page.h>
 12 #include <asm/types.h>
 13 
 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
 18  */
 19 #ifndef __ASSEMBLY__
 20 struct task_struct;
 21 struct exec_domain;
 22 #include <asm/processor.h>
 23 #include <linux/atomic.h>
 24 
 25 struct thread_info {
 26         struct task_struct      *task;          /* main task structure */
 27         struct exec_domain      *exec_domain;   /* execution domain */
 28         __u32                   flags;          /* low level flags */
 29         __u32                   status;         /* thread synchronous flags */
 30         __u32                   cpu;            /* current CPU */
 31         int                     saved_preempt_count;
 32         mm_segment_t            addr_limit;
 33         struct restart_block    restart_block;
 34         void __user             *sysenter_return;
 35 #ifdef CONFIG_X86_32
 36         unsigned long           previous_esp;   /* ESP of the previous stack in
 37                                                    case of nested (IRQ) stacks
 38                                                 */
 39         __u8                    supervisor_stack[0];
 40 #endif
 41         unsigned int            sig_on_uaccess_error:1;
 42         unsigned int            uaccess_err:1;  /* uaccess failed */
 43 };
 44 
 45 #define INIT_THREAD_INFO(tsk)                   \
 46 {                                               \
 47         .task           = &tsk,                 \
 48         .exec_domain    = &default_exec_domain, \
 49         .flags          = 0,                    \
 50         .cpu            = 0,                    \
 51         .saved_preempt_count = INIT_PREEMPT_COUNT,      \
 52         .addr_limit     = KERNEL_DS,            \
 53         .restart_block = {                      \
 54                 .fn = do_no_restart_syscall,    \
 55         },                                      \
 56 }
 57 
 58 #define init_thread_info        (init_thread_union.thread_info)
 59 #define init_stack              (init_thread_union.stack)
 60 
 61 #else /* !__ASSEMBLY__ */
 62 
 63 #include <asm/asm-offsets.h>
 64 
 65 #endif
 66 
 67 /*
 68  * thread information flags
 69  * - these are process state flags that various assembly files
 70  *   may need to access
 71  * - pending work-to-be-done flags are in LSW
 72  * - other flags in MSW
 73  * Warning: layout of LSW is hardcoded in entry.S
 74  */
 75 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 76 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 77 #define TIF_SIGPENDING          2       /* signal pending */
 78 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 79 #define TIF_SINGLESTEP          4       /* reenable singlestep on user return*/
 80 #define TIF_SYSCALL_EMU         6       /* syscall emulation active */
 81 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
 82 #define TIF_SECCOMP             8       /* secure computing */
 83 #define TIF_MCE_NOTIFY          10      /* notify userspace of an MCE */
 84 #define TIF_USER_RETURN_NOTIFY  11      /* notify kernel of userspace return */
 85 #define TIF_UPROBE              12      /* breakpointed or singlestepping */
 86 #define TIF_NOTSC               16      /* TSC is not accessible in userland */
 87 #define TIF_IA32                17      /* IA32 compatibility process */
 88 #define TIF_FORK                18      /* ret_from_fork */
 89 #define TIF_NOHZ                19      /* in adaptive nohz mode */
 90 #define TIF_MEMDIE              20      /* is terminating due to OOM killer */
 91 #define TIF_IO_BITMAP           22      /* uses I/O bitmap */
 92 #define TIF_FORCED_TF           24      /* true if TF in eflags artificially */
 93 #define TIF_BLOCKSTEP           25      /* set when we want DEBUGCTLMSR_BTF */
 94 #define TIF_LAZY_MMU_UPDATES    27      /* task is updating the mmu lazily */
 95 #define TIF_SYSCALL_TRACEPOINT  28      /* syscall tracepoint instrumentation */
 96 #define TIF_ADDR32              29      /* 32-bit address space on 64 bits */
 97 #define TIF_X32                 30      /* 32-bit native x86-64 binary */
 98 
 99 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
100 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
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_SYSCALL_EMU        (1 << TIF_SYSCALL_EMU)
105 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
106 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
107 #define _TIF_MCE_NOTIFY         (1 << TIF_MCE_NOTIFY)
108 #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
109 #define _TIF_UPROBE             (1 << TIF_UPROBE)
110 #define _TIF_NOTSC              (1 << TIF_NOTSC)
111 #define _TIF_IA32               (1 << TIF_IA32)
112 #define _TIF_FORK               (1 << TIF_FORK)
113 #define _TIF_NOHZ               (1 << TIF_NOHZ)
114 #define _TIF_IO_BITMAP          (1 << TIF_IO_BITMAP)
115 #define _TIF_FORCED_TF          (1 << TIF_FORCED_TF)
116 #define _TIF_BLOCKSTEP          (1 << TIF_BLOCKSTEP)
117 #define _TIF_LAZY_MMU_UPDATES   (1 << TIF_LAZY_MMU_UPDATES)
118 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
119 #define _TIF_ADDR32             (1 << TIF_ADDR32)
120 #define _TIF_X32                (1 << TIF_X32)
121 
122 /* work to do in syscall_trace_enter() */
123 #define _TIF_WORK_SYSCALL_ENTRY \
124         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT |   \
125          _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT |     \
126          _TIF_NOHZ)
127 
128 /* work to do in syscall_trace_leave() */
129 #define _TIF_WORK_SYSCALL_EXIT  \
130         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP |    \
131          _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ)
132 
133 /* work to do on interrupt/exception return */
134 #define _TIF_WORK_MASK                                                  \
135         (0x0000FFFF &                                                   \
136          ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|                       \
137            _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU))
138 
139 /* work to do on any return to user space */
140 #define _TIF_ALLWORK_MASK                                               \
141         ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT |       \
142         _TIF_NOHZ)
143 
144 /* Only used for 64 bit */
145 #define _TIF_DO_NOTIFY_MASK                                             \
146         (_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME |       \
147          _TIF_USER_RETURN_NOTIFY)
148 
149 /* flags to check in __switch_to() */
150 #define _TIF_WORK_CTXSW                                                 \
151         (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP)
152 
153 #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
154 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
155 
156 #ifdef CONFIG_X86_32
157 
158 #define STACK_WARN      (THREAD_SIZE/8)
159 /*
160  * macros/functions for gaining access to the thread information structure
161  *
162  * preempt_count needs to be 1 initially, until the scheduler is functional.
163  */
164 #ifndef __ASSEMBLY__
165 
166 #define current_stack_pointer ({                \
167         unsigned long sp;                       \
168         asm("mov %%esp,%0" : "=g" (sp));        \
169         sp;                                     \
170 })
171 
172 /* how to get the thread information struct from C */
173 static inline struct thread_info *current_thread_info(void)
174 {
175         return (struct thread_info *)
176                 (current_stack_pointer & ~(THREAD_SIZE - 1));
177 }
178 
179 #else /* !__ASSEMBLY__ */
180 
181 /* how to get the thread information struct from ASM */
182 #define GET_THREAD_INFO(reg)     \
183         movl $-THREAD_SIZE, reg; \
184         andl %esp, reg
185 
186 /* use this one if reg already contains %esp */
187 #define GET_THREAD_INFO_WITH_ESP(reg) \
188         andl $-THREAD_SIZE, reg
189 
190 #endif
191 
192 #else /* X86_32 */
193 
194 #include <asm/percpu.h>
195 #define KERNEL_STACK_OFFSET (5*8)
196 
197 /*
198  * macros/functions for gaining access to the thread information structure
199  * preempt_count needs to be 1 initially, until the scheduler is functional.
200  */
201 #ifndef __ASSEMBLY__
202 DECLARE_PER_CPU(unsigned long, kernel_stack);
203 
204 static inline struct thread_info *current_thread_info(void)
205 {
206         struct thread_info *ti;
207         ti = (void *)(this_cpu_read_stable(kernel_stack) +
208                       KERNEL_STACK_OFFSET - THREAD_SIZE);
209         return ti;
210 }
211 
212 #else /* !__ASSEMBLY__ */
213 
214 /* how to get the thread information struct from ASM */
215 #define GET_THREAD_INFO(reg) \
216         movq PER_CPU_VAR(kernel_stack),reg ; \
217         subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg
218 
219 /*
220  * Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in
221  * a certain register (to be used in assembler memory operands).
222  */
223 #define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg)
224 
225 #endif
226 
227 #endif /* !X86_32 */
228 
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_COMPAT               0x0002  /* 32bit syscall active (64BIT)*/
237 #define TS_POLLING              0x0004  /* idle task polling need_resched,
238                                            skip sending interrupt */
239 #define TS_RESTORE_SIGMASK      0x0008  /* restore signal mask in do_signal() */
240 
241 #ifndef __ASSEMBLY__
242 #define HAVE_SET_RESTORE_SIGMASK        1
243 static inline void set_restore_sigmask(void)
244 {
245         struct thread_info *ti = current_thread_info();
246         ti->status |= TS_RESTORE_SIGMASK;
247         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
248 }
249 static inline void clear_restore_sigmask(void)
250 {
251         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
252 }
253 static inline bool test_restore_sigmask(void)
254 {
255         return current_thread_info()->status & TS_RESTORE_SIGMASK;
256 }
257 static inline bool test_and_clear_restore_sigmask(void)
258 {
259         struct thread_info *ti = current_thread_info();
260         if (!(ti->status & TS_RESTORE_SIGMASK))
261                 return false;
262         ti->status &= ~TS_RESTORE_SIGMASK;
263         return true;
264 }
265 
266 static inline bool is_ia32_task(void)
267 {
268 #ifdef CONFIG_X86_32
269         return true;
270 #endif
271 #ifdef CONFIG_IA32_EMULATION
272         if (current_thread_info()->status & TS_COMPAT)
273                 return true;
274 #endif
275         return false;
276 }
277 #endif  /* !__ASSEMBLY__ */
278 
279 #ifndef __ASSEMBLY__
280 extern void arch_task_cache_init(void);
281 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
282 extern void arch_release_task_struct(struct task_struct *tsk);
283 #endif
284 #endif /* _ASM_X86_THREAD_INFO_H */
285 

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