arch/arm/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/include/asm/thread_info.h
   4  *
   5  *  Copyright (C) 2002 Russell King.
   6  */
   7 #ifndef __ASM_ARM_THREAD_INFO_H
   8 #define __ASM_ARM_THREAD_INFO_H
   9
  10 #ifdef __KERNEL__
  11
  12 #include <linux/compiler.h>
  13 #include <asm/fpstate.h>
  14 #include <asm/page.h>
  15
  16 #define THREAD_SIZE_ORDER       1
  17 #define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  18 #define THREAD_START_SP         (THREAD_SIZE - 8)
  19
  20 #ifndef __ASSEMBLY__
  21
  22 struct task_struct;
  23
  24 #include <asm/types.h>
  25
  26 typedef unsigned long mm_segment_t;
  27
  28 struct cpu_context_save {
  29         __u32   r4;
  30         __u32   r5;
  31         __u32   r6;
  32         __u32   r7;
  33         __u32   r8;
  34         __u32   r9;
  35         __u32   sl;
  36         __u32   fp;
  37         __u32   sp;
  38         __u32   pc;
  39         __u32   extra[2];               /* Xscale 'acc' register, etc */
  40 };
  41
  42 /*
  43  * low level task data that entry.S needs immediate access to.
  44  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  45  */
  46 struct thread_info {
  47         unsigned long           flags;          /* low level flags */
  48         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  49         mm_segment_t            addr_limit;     /* address limit */
  50         struct task_struct      *task;          /* main task structure */
  51         __u32                   cpu;            /* cpu */
  52         __u32                   cpu_domain;     /* cpu domain */
  53 #ifdef CONFIG_STACKPROTECTOR_PER_TASK
  54         unsigned long           stack_canary;
  55 #endif
  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 /*
  79  * how to get the current stack pointer in C
  80  */
  81 register unsigned long current_stack_pointer asm ("sp");
  82
  83 /*
  84  * how to get the thread information struct from C
  85  */
  86 static inline struct thread_info *current_thread_info(void) __attribute_const__;
  87
  88 static inline struct thread_info *current_thread_info(void)
  89 {
  90         return (struct thread_info *)
  91                 (current_stack_pointer & ~(THREAD_SIZE - 1));
  92 }
  93
  94 #define thread_saved_pc(tsk)    \
  95         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
  96 #define thread_saved_sp(tsk)    \
  97         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
  98
  99 #ifndef CONFIG_THUMB2_KERNEL
 100 #define thread_saved_fp(tsk)    \
 101         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
 102 #else
 103 #define thread_saved_fp(tsk)    \
 104         ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
 105 #endif
 106
 107 extern void crunch_task_disable(struct thread_info *);
 108 extern void crunch_task_copy(struct thread_info *, void *);
 109 extern void crunch_task_restore(struct thread_info *, void *);
 110 extern void crunch_task_release(struct thread_info *);
 111
 112 extern void iwmmxt_task_disable(struct thread_info *);
 113 extern void iwmmxt_task_copy(struct thread_info *, void *);
 114 extern void iwmmxt_task_restore(struct thread_info *, void *);
 115 extern void iwmmxt_task_release(struct thread_info *);
 116 extern void iwmmxt_task_switch(struct thread_info *);
 117
 118 extern void vfp_sync_hwstate(struct thread_info *);
 119 extern void vfp_flush_hwstate(struct thread_info *);
 120
 121 struct user_vfp;
 122 struct user_vfp_exc;
 123
 124 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
 125                                            struct user_vfp_exc *);
 126 extern int vfp_restore_user_hwstate(struct user_vfp *,
 127                                     struct user_vfp_exc *);
 128 #endif
 129
 130 /*
 131  * thread information flags:
 132  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 133  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 134  */
 135 #define TIF_SIGPENDING          0       /* signal pending */
 136 #define TIF_NEED_RESCHED        1       /* rescheduling necessary */
 137 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 138 #define TIF_UPROBE              3       /* breakpointed or singlestepping */
 139 #define TIF_SYSCALL_TRACE       4       /* syscall trace active */
 140 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 141 #define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
 142 #define TIF_SECCOMP             7       /* seccomp syscall filtering active */
 143
 144 #define TIF_NOHZ                12      /* in adaptive nohz mode */
 145 #define TIF_USING_IWMMXT        17
 146 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 147 #define TIF_RESTORE_SIGMASK     20
 148
 149 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 150 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 151 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 152 #define _TIF_UPROBE             (1 << TIF_UPROBE)
 153 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 154 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 155 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 156 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 157 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 158
 159 /* Checks for any syscall work in entry-common.S */
 160 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 161                            _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
 162
 163 /*
 164  * Change these and you break ASM code in entry-common.S
 165  */
 166 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 167                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE)
 168
 169 #endif /* __KERNEL__ */
 170 #endif /* __ASM_ARM_THREAD_INFO_H */