arch/arm/include/asm/thread_info.h

   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         struct cpu_context_save cpu_context;    /* cpu context */
  57         __u32                   syscall;        /* syscall number */
  58         __u8                    used_cp[16];    /* thread used copro */
  59         unsigned long           tp_value[2];    /* TLS registers */
  60 #ifdef CONFIG_CRUNCH
  61         struct crunch_state     crunchstate;
  62 #endif
  63         union fp_state          fpstate __attribute__((aligned(8)));
  64         union vfp_state         vfpstate;
  65 #ifdef CONFIG_ARM_THUMBEE
  66         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  67 #endif
  68 };
  69
  70 #define INIT_THREAD_INFO(tsk)                                           \
  71 {                                                                       \
  72         .task           = &tsk,                                         \
  73         .flags          = 0,                                            \
  74         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  75         .addr_limit     = KERNEL_DS,                                    \
  76 }
  77
  78 #define init_thread_info        (init_thread_union.thread_info)
  79 #define init_stack              (init_thread_union.stack)
  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 __user *,
 128                                            struct user_vfp_exc __user *);
 129 extern int vfp_restore_user_hwstate(struct user_vfp __user *,
 130                                     struct user_vfp_exc __user *);
 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 */