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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/percpu.h>
 13 #include <asm/types.h>
 14 
 15 /*
 16  * low level task data that entry.S needs immediate access to
 17  * - this struct should fit entirely inside of one cache line
 18  * - this struct shares the supervisor stack pages
 19  */
 20 #ifndef __ASSEMBLY__
 21 struct task_struct;
 22 struct exec_domain;
 23 #include <asm/processor.h>
 24 #include <linux/atomic.h>
 25 
 26 struct thread_info {
 27         struct task_struct      *task;          /* main task structure */
 28         struct exec_domain      *exec_domain;   /* execution domain */
 29         __u32                   flags;          /* low level flags */
 30         __u32                   status;         /* thread synchronous flags */
 31         __u32                   cpu;            /* current CPU */
 32         int                     saved_preempt_count;
 33         mm_segment_t            addr_limit;
 34         void __user             *sysenter_return;
 35         unsigned int            sig_on_uaccess_error:1;
 36         unsigned int            uaccess_err:1;  /* uaccess failed */
 37 };
 38 
 39 #define INIT_THREAD_INFO(tsk)                   \
 40 {                                               \
 41         .task           = &tsk,                 \
 42         .exec_domain    = &default_exec_domain, \
 43         .flags          = 0,                    \
 44         .cpu            = 0,                    \
 45         .saved_preempt_count = INIT_PREEMPT_COUNT,      \
 46         .addr_limit     = KERNEL_DS,            \
 47 }
 48 
 49 #define init_thread_info        (init_thread_union.thread_info)
 50 #define init_stack              (init_thread_union.stack)
 51 
 52 #else /* !__ASSEMBLY__ */
 53 
 54 #include <asm/asm-offsets.h>
 55 
 56 #endif
 57 
 58 /*
 59  * thread information flags
 60  * - these are process state flags that various assembly files
 61  *   may need to access
 62  * - pending work-to-be-done flags are in LSW
 63  * - other flags in MSW
 64  * Warning: layout of LSW is hardcoded in entry.S
 65  */
 66 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 67 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 68 #define TIF_SIGPENDING          2       /* signal pending */
 69 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 70 #define TIF_SINGLESTEP          4       /* reenable singlestep on user return*/
 71 #define TIF_SYSCALL_EMU         6       /* syscall emulation active */
 72 #define TIF_SYSCALL_AUDIT       7       /* syscall auditing active */
 73 #define TIF_SECCOMP             8       /* secure computing */
 74 #define TIF_USER_RETURN_NOTIFY  11      /* notify kernel of userspace return */
 75 #define TIF_UPROBE              12      /* breakpointed or singlestepping */
 76 #define TIF_NOTSC               16      /* TSC is not accessible in userland */
 77 #define TIF_IA32                17      /* IA32 compatibility process */
 78 #define TIF_FORK                18      /* ret_from_fork */
 79 #define TIF_NOHZ                19      /* in adaptive nohz mode */
 80 #define TIF_MEMDIE              20      /* is terminating due to OOM killer */
 81 #define TIF_POLLING_NRFLAG      21      /* idle is polling for TIF_NEED_RESCHED */
 82 #define TIF_IO_BITMAP           22      /* uses I/O bitmap */
 83 #define TIF_FORCED_TF           24      /* true if TF in eflags artificially */
 84 #define TIF_BLOCKSTEP           25      /* set when we want DEBUGCTLMSR_BTF */
 85 #define TIF_LAZY_MMU_UPDATES    27      /* task is updating the mmu lazily */
 86 #define TIF_SYSCALL_TRACEPOINT  28      /* syscall tracepoint instrumentation */
 87 #define TIF_ADDR32              29      /* 32-bit address space on 64 bits */
 88 #define TIF_X32                 30      /* 32-bit native x86-64 binary */
 89 
 90 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 91 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 92 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 93 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 94 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 95 #define _TIF_SYSCALL_EMU        (1 << TIF_SYSCALL_EMU)
 96 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 97 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 98 #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
 99 #define _TIF_UPROBE             (1 << TIF_UPROBE)
100 #define _TIF_NOTSC              (1 << TIF_NOTSC)
101 #define _TIF_IA32               (1 << TIF_IA32)
102 #define _TIF_FORK               (1 << TIF_FORK)
103 #define _TIF_NOHZ               (1 << TIF_NOHZ)
104 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
105 #define _TIF_IO_BITMAP          (1 << TIF_IO_BITMAP)
106 #define _TIF_FORCED_TF          (1 << TIF_FORCED_TF)
107 #define _TIF_BLOCKSTEP          (1 << TIF_BLOCKSTEP)
108 #define _TIF_LAZY_MMU_UPDATES   (1 << TIF_LAZY_MMU_UPDATES)
109 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
110 #define _TIF_ADDR32             (1 << TIF_ADDR32)
111 #define _TIF_X32                (1 << TIF_X32)
112 
113 /* work to do in syscall_trace_enter() */
114 #define _TIF_WORK_SYSCALL_ENTRY \
115         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT |   \
116          _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT |     \
117          _TIF_NOHZ)
118 
119 /* work to do in syscall_trace_leave() */
120 #define _TIF_WORK_SYSCALL_EXIT  \
121         (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP |    \
122          _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ)
123 
124 /* work to do on interrupt/exception return */
125 #define _TIF_WORK_MASK                                                  \
126         (0x0000FFFF &                                                   \
127          ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|                       \
128            _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU))
129 
130 /* work to do on any return to user space */
131 #define _TIF_ALLWORK_MASK                                               \
132         ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT |       \
133         _TIF_NOHZ)
134 
135 /* Only used for 64 bit */
136 #define _TIF_DO_NOTIFY_MASK                                             \
137         (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME |                         \
138          _TIF_USER_RETURN_NOTIFY | _TIF_UPROBE)
139 
140 /* flags to check in __switch_to() */
141 #define _TIF_WORK_CTXSW                                                 \
142         (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP)
143 
144 #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
145 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
146 
147 #define STACK_WARN              (THREAD_SIZE/8)
148 #define KERNEL_STACK_OFFSET     (5*(BITS_PER_LONG/8))
149 
150 /*
151  * macros/functions for gaining access to the thread information structure
152  *
153  * preempt_count needs to be 1 initially, until the scheduler is functional.
154  */
155 #ifndef __ASSEMBLY__
156 
157 DECLARE_PER_CPU(unsigned long, kernel_stack);
158 
159 static inline struct thread_info *current_thread_info(void)
160 {
161         struct thread_info *ti;
162         ti = (void *)(this_cpu_read_stable(kernel_stack) +
163                       KERNEL_STACK_OFFSET - THREAD_SIZE);
164         return ti;
165 }
166 
167 static inline unsigned long current_stack_pointer(void)
168 {
169         unsigned long sp;
170 #ifdef CONFIG_X86_64
171         asm("mov %%rsp,%0" : "=g" (sp));
172 #else
173         asm("mov %%esp,%0" : "=g" (sp));
174 #endif
175         return sp;
176 }
177 
178 #else /* !__ASSEMBLY__ */
179 
180 /* how to get the thread information struct from ASM */
181 #define GET_THREAD_INFO(reg) \
182         _ASM_MOV PER_CPU_VAR(kernel_stack),reg ; \
183         _ASM_SUB $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg ;
184 
185 /*
186  * Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in
187  * a certain register (to be used in assembler memory operands).
188  */
189 #define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg)
190 
191 #endif
192 
193 /*
194  * Thread-synchronous status.
195  *
196  * This is different from the flags in that nobody else
197  * ever touches our thread-synchronous status, so we don't
198  * have to worry about atomic accesses.
199  */
200 #define TS_COMPAT               0x0002  /* 32bit syscall active (64BIT)*/
201 #define TS_RESTORE_SIGMASK      0x0008  /* restore signal mask in do_signal() */
202 
203 #ifndef __ASSEMBLY__
204 #define HAVE_SET_RESTORE_SIGMASK        1
205 static inline void set_restore_sigmask(void)
206 {
207         struct thread_info *ti = current_thread_info();
208         ti->status |= TS_RESTORE_SIGMASK;
209         WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
210 }
211 static inline void clear_restore_sigmask(void)
212 {
213         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
214 }
215 static inline bool test_restore_sigmask(void)
216 {
217         return current_thread_info()->status & TS_RESTORE_SIGMASK;
218 }
219 static inline bool test_and_clear_restore_sigmask(void)
220 {
221         struct thread_info *ti = current_thread_info();
222         if (!(ti->status & TS_RESTORE_SIGMASK))
223                 return false;
224         ti->status &= ~TS_RESTORE_SIGMASK;
225         return true;
226 }
227 
228 static inline bool is_ia32_task(void)
229 {
230 #ifdef CONFIG_X86_32
231         return true;
232 #endif
233 #ifdef CONFIG_IA32_EMULATION
234         if (current_thread_info()->status & TS_COMPAT)
235                 return true;
236 #endif
237         return false;
238 }
239 #endif  /* !__ASSEMBLY__ */
240 
241 #ifndef __ASSEMBLY__
242 extern void arch_task_cache_init(void);
243 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
244 extern void arch_release_task_struct(struct task_struct *tsk);
245 #endif
246 #endif /* _ASM_X86_THREAD_INFO_H */
247 

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