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

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  1 /*
  2  *  arch/arm/include/asm/thread_info.h
  3  *
  4  *  Copyright (C) 2002 Russell King.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #ifndef __ASM_ARM_THREAD_INFO_H
 11 #define __ASM_ARM_THREAD_INFO_H
 12 
 13 #ifdef __KERNEL__
 14 
 15 #include <linux/compiler.h>
 16 #include <asm/fpstate.h>
 17 #include <asm/page.h>
 18 
 19 #define THREAD_SIZE_ORDER       1
 20 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
 21 #define THREAD_START_SP         (THREAD_SIZE - 8)
 22 
 23 #ifndef __ASSEMBLY__
 24 
 25 struct task_struct;
 26 
 27 #include <asm/types.h>
 28 
 29 typedef unsigned long mm_segment_t;
 30 
 31 struct cpu_context_save {
 32         __u32   r4;
 33         __u32   r5;
 34         __u32   r6;
 35         __u32   r7;
 36         __u32   r8;
 37         __u32   r9;
 38         __u32   sl;
 39         __u32   fp;
 40         __u32   sp;
 41         __u32   pc;
 42         __u32   extra[2];               /* Xscale 'acc' register, etc */
 43 };
 44 
 45 /*
 46  * low level task data that entry.S needs immediate access to.
 47  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 48  */
 49 struct thread_info {
 50         unsigned long           flags;          /* low level flags */
 51         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
 52         mm_segment_t            addr_limit;     /* address limit */
 53         struct task_struct      *task;          /* main task structure */
 54         __u32                   cpu;            /* cpu */
 55         __u32                   cpu_domain;     /* cpu domain */
 56 #ifdef CONFIG_STACKPROTECTOR_PER_TASK
 57         unsigned long           stack_canary;
 58 #endif
 59         struct cpu_context_save cpu_context;    /* cpu context */
 60         __u32                   syscall;        /* syscall number */
 61         __u8                    used_cp[16];    /* thread used copro */
 62         unsigned long           tp_value[2];    /* TLS registers */
 63 #ifdef CONFIG_CRUNCH
 64         struct crunch_state     crunchstate;
 65 #endif
 66         union fp_state          fpstate __attribute__((aligned(8)));
 67         union vfp_state         vfpstate;
 68 #ifdef CONFIG_ARM_THUMBEE
 69         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
 70 #endif
 71 };
 72 
 73 #define INIT_THREAD_INFO(tsk)                                           \
 74 {                                                                       \
 75         .task           = &tsk,                                         \
 76         .flags          = 0,                                            \
 77         .preempt_count  = INIT_PREEMPT_COUNT,                           \
 78         .addr_limit     = KERNEL_DS,                                    \
 79 }
 80 
 81 /*
 82  * how to get the current stack pointer in C
 83  */
 84 register unsigned long current_stack_pointer asm ("sp");
 85 
 86 /*
 87  * how to get the thread information struct from C
 88  */
 89 static inline struct thread_info *current_thread_info(void) __attribute_const__;
 90 
 91 static inline struct thread_info *current_thread_info(void)
 92 {
 93         return (struct thread_info *)
 94                 (current_stack_pointer & ~(THREAD_SIZE - 1));
 95 }
 96 
 97 #define thread_saved_pc(tsk)    \
 98         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
 99 #define thread_saved_sp(tsk)    \
100         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
101 
102 #ifndef CONFIG_THUMB2_KERNEL
103 #define thread_saved_fp(tsk)    \
104         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
105 #else
106 #define thread_saved_fp(tsk)    \
107         ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
108 #endif
109 
110 extern void crunch_task_disable(struct thread_info *);
111 extern void crunch_task_copy(struct thread_info *, void *);
112 extern void crunch_task_restore(struct thread_info *, void *);
113 extern void crunch_task_release(struct thread_info *);
114 
115 extern void iwmmxt_task_disable(struct thread_info *);
116 extern void iwmmxt_task_copy(struct thread_info *, void *);
117 extern void iwmmxt_task_restore(struct thread_info *, void *);
118 extern void iwmmxt_task_release(struct thread_info *);
119 extern void iwmmxt_task_switch(struct thread_info *);
120 
121 extern void vfp_sync_hwstate(struct thread_info *);
122 extern void vfp_flush_hwstate(struct thread_info *);
123 
124 struct user_vfp;
125 struct user_vfp_exc;
126 
127 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
128                                            struct user_vfp_exc *);
129 extern int vfp_restore_user_hwstate(struct user_vfp *,
130                                     struct user_vfp_exc *);
131 #endif
132 
133 /*
134  * thread information flags:
135  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
136  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
137  */
138 #define TIF_SIGPENDING          0       /* signal pending */
139 #define TIF_NEED_RESCHED        1       /* rescheduling necessary */
140 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
141 #define TIF_UPROBE              3       /* breakpointed or singlestepping */
142 #define TIF_SYSCALL_TRACE       4       /* syscall trace active */
143 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
144 #define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
145 #define TIF_SECCOMP             7       /* seccomp syscall filtering active */
146 
147 #define TIF_NOHZ                12      /* in adaptive nohz mode */
148 #define TIF_USING_IWMMXT        17
149 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
150 #define TIF_RESTORE_SIGMASK     20
151 
152 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
153 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
154 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
155 #define _TIF_UPROBE             (1 << TIF_UPROBE)
156 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
157 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
158 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
159 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
160 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
161 
162 /* Checks for any syscall work in entry-common.S */
163 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
164                            _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
165 
166 /*
167  * Change these and you break ASM code in entry-common.S
168  */
169 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
170                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE)
171 
172 #endif /* __KERNEL__ */
173 #endif /* __ASM_ARM_THREAD_INFO_H */
174 

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