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 #ifdef CONFIG_VMAP_STACK
  29 #define THREAD_ALIGN            (2 * THREAD_SIZE)
  30 #else
  31 #define THREAD_ALIGN            THREAD_SIZE
  32 #endif
  33
  34 #define OVERFLOW_STACK_SIZE     SZ_4K
  35
  36 #ifndef __ASSEMBLY__
  37
  38 struct task_struct;
  39
  40 DECLARE_PER_CPU(struct task_struct *, __entry_task);
  41
  42 #include <asm/types.h>
  43 #include <asm/traps.h>
  44
  45 struct cpu_context_save {
  46         __u32   r4;
  47         __u32   r5;
  48         __u32   r6;
  49         __u32   r7;
  50         __u32   r8;
  51         __u32   r9;
  52         __u32   sl;
  53         __u32   fp;
  54         __u32   sp;
  55         __u32   pc;
  56         __u32   extra[2];               /* Xscale 'acc' register, etc */
  57 };
  58
  59 /*
  60  * low level task data that entry.S needs immediate access to.
  61  * __switch_to() assumes cpu_context follows immediately after cpu_domain.
  62  */
  63 struct thread_info {
  64         unsigned long           flags;          /* low level flags */
  65         int                     preempt_count;  /* 0 => preemptable, <0 => bug */
  66         __u32                   cpu;            /* cpu */
  67         __u32                   cpu_domain;     /* cpu domain */
  68         struct cpu_context_save cpu_context;    /* cpu context */
  69         __u32                   abi_syscall;    /* ABI type and syscall nr */
  70         unsigned long           tp_value[2];    /* TLS registers */
  71         union fp_state          fpstate __attribute__((aligned(8)));
  72         union vfp_state         vfpstate;
  73 #ifdef CONFIG_ARM_THUMBEE
  74         unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
  75 #endif
  76 };
  77
  78 #define INIT_THREAD_INFO(tsk)                                           \
  79 {                                                                       \
  80         .flags          = 0,                                            \
  81         .preempt_count  = INIT_PREEMPT_COUNT,                           \
  82 }
  83
  84 static inline struct task_struct *thread_task(struct thread_info* ti)
  85 {
  86         return (struct task_struct *)ti;
  87 }
  88
  89 #define thread_saved_pc(tsk)    \
  90         ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
  91 #define thread_saved_sp(tsk)    \
  92         ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
  93
  94 #ifndef CONFIG_THUMB2_KERNEL
  95 #define thread_saved_fp(tsk)    \
  96         ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
  97 #else
  98 #define thread_saved_fp(tsk)    \
  99         ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
 100 #endif
 101
 102 extern void iwmmxt_task_disable(struct thread_info *);
 103 extern void iwmmxt_task_copy(struct thread_info *, void *);
 104 extern void iwmmxt_task_restore(struct thread_info *, void *);
 105 extern void iwmmxt_task_release(struct thread_info *);
 106 extern void iwmmxt_task_switch(struct thread_info *);
 107
 108 extern int iwmmxt_undef_handler(struct pt_regs *, u32);
 109
 110 static inline void register_iwmmxt_undef_handler(void)
 111 {
 112         static struct undef_hook iwmmxt_undef_hook = {
 113                 .instr_mask     = 0x0c000e00,
 114                 .instr_val      = 0x0c000000,
 115                 .cpsr_mask      = MODE_MASK | PSR_T_BIT,
 116                 .cpsr_val       = USR_MODE,
 117                 .fn             = iwmmxt_undef_handler,
 118         };
 119
 120         register_undef_hook(&iwmmxt_undef_hook);
 121 }
 122
 123 extern void vfp_sync_hwstate(struct thread_info *);
 124 extern void vfp_flush_hwstate(struct thread_info *);
 125
 126 struct user_vfp;
 127 struct user_vfp_exc;
 128
 129 extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
 130                                            struct user_vfp_exc *);
 131 extern int vfp_restore_user_hwstate(struct user_vfp *,
 132                                     struct user_vfp_exc *);
 133 #endif
 134
 135 /*
 136  * thread information flags:
 137  *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 138  *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 139  *
 140  * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
 141  */
 142 #define TIF_SIGPENDING          0       /* signal pending */
 143 #define TIF_NEED_RESCHED        1       /* rescheduling necessary */
 144 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
 145 #define TIF_UPROBE              3       /* breakpointed or singlestepping */
 146 #define TIF_NOTIFY_SIGNAL       4       /* signal notifications exist */
 147
 148 #define TIF_USING_IWMMXT        17
 149 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 150 #define TIF_RESTORE_SIGMASK     19
 151 #define TIF_SYSCALL_TRACE       20      /* syscall trace active */
 152 #define TIF_SYSCALL_AUDIT       21      /* syscall auditing active */
 153 #define TIF_SYSCALL_TRACEPOINT  22      /* syscall tracepoint instrumentation */
 154 #define TIF_SECCOMP             23      /* seccomp syscall filtering active */
 155
 156
 157 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 158 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 159 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 160 #define _TIF_UPROBE             (1 << TIF_UPROBE)
 161 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 162 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 163 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 164 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 165 #define _TIF_NOTIFY_SIGNAL      (1 << TIF_NOTIFY_SIGNAL)
 166 #define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)
 167
 168 /* Checks for any syscall work in entry-common.S */
 169 #define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 170                            _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
 171
 172 /*
 173  * Change these and you break ASM code in entry-common.S
 174  */
 175 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 176                                  _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
 177                                  _TIF_NOTIFY_SIGNAL)
 178
 179 #endif /* __KERNEL__ */
 180 #endif /* __ASM_ARM_THREAD_INFO_H */