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