arch/arm64/include/asm/thread_info.h

   1 /*
   2  * Based on arch/arm/include/asm/thread_info.h
   3  *
   4  * Copyright (C) 2002 Russell King.
   5  * Copyright (C) 2012 ARM Ltd.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #ifndef __ASM_THREAD_INFO_H
  20 #define __ASM_THREAD_INFO_H
  21
  22 #ifdef __KERNEL__
  23
  24 #include <linux/compiler.h>
  25
  26 #ifndef __ASSEMBLY__
  27
  28 struct task_struct;
  29
  30 #include <asm/memory.h>
  31 #include <asm/stack_pointer.h>
  32 #include <asm/types.h>
  33
  34 typedef unsigned long mm_segment_t;
  35
  36 /*
  37  * low level task data that entry.S needs immediate access to.
  38  */
  39 struct thread_info {
  40         unsigned long           flags;          /* low level flags */
  41         mm_segment_t            addr_limit;     /* address limit */
  42 #ifdef CONFIG_ARM64_SW_TTBR0_PAN
  43         u64                     ttbr0;          /* saved TTBR0_EL1 */
  44 #endif
  45         union {
  46                 u64             preempt_count;  /* 0 => preemptible, <0 => bug */
  47                 struct {
  48 #ifdef CONFIG_CPU_BIG_ENDIAN
  49                         u32     need_resched;
  50                         u32     count;
  51 #else
  52                         u32     count;
  53                         u32     need_resched;
  54 #endif
  55                 } preempt;
  56         };
  57 };
  58
  59 #define thread_saved_pc(tsk)    \
  60         ((unsigned long)(tsk->thread.cpu_context.pc))
  61 #define thread_saved_sp(tsk)    \
  62         ((unsigned long)(tsk->thread.cpu_context.sp))
  63 #define thread_saved_fp(tsk)    \
  64         ((unsigned long)(tsk->thread.cpu_context.fp))
  65
  66 void arch_setup_new_exec(void);
  67 #define arch_setup_new_exec     arch_setup_new_exec
  68
  69 void arch_release_task_struct(struct task_struct *tsk);
  70
  71 #endif
  72
  73 /*
  74  * thread information flags:
  75  *  TIF_SYSCALL_TRACE   - syscall trace active
  76  *  TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace
  77  *  TIF_SYSCALL_AUDIT   - syscall auditing
  78  *  TIF_SECOMP          - syscall secure computing
  79  *  TIF_SIGPENDING      - signal pending
  80  *  TIF_NEED_RESCHED    - rescheduling necessary
  81  *  TIF_NOTIFY_RESUME   - callback before returning to user
  82  */
  83 #define TIF_SIGPENDING          0
  84 #define TIF_NEED_RESCHED        1
  85 #define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
  86 #define TIF_FOREIGN_FPSTATE     3       /* CPU's FP state is not current's */
  87 #define TIF_UPROBE              4       /* uprobe breakpoint or singlestep */
  88 #define TIF_FSCHECK             5       /* Check FS is USER_DS on return */
  89 #define TIF_NOHZ                7
  90 #define TIF_SYSCALL_TRACE       8
  91 #define TIF_SYSCALL_AUDIT       9
  92 #define TIF_SYSCALL_TRACEPOINT  10
  93 #define TIF_SECCOMP             11
  94 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
  95 #define TIF_FREEZE              19
  96 #define TIF_RESTORE_SIGMASK     20
  97 #define TIF_SINGLESTEP          21
  98 #define TIF_32BIT               22      /* 32bit process */
  99 #define TIF_SVE                 23      /* Scalable Vector Extension in use */
 100 #define TIF_SVE_VL_INHERIT      24      /* Inherit sve_vl_onexec across exec */
 101 #define TIF_SSBD                25      /* Wants SSB mitigation */
 102
 103 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 104 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 105 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 106 #define _TIF_FOREIGN_FPSTATE    (1 << TIF_FOREIGN_FPSTATE)
 107 #define _TIF_NOHZ               (1 << TIF_NOHZ)
 108 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 109 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 110 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 111 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 112 #define _TIF_UPROBE             (1 << TIF_UPROBE)
 113 #define _TIF_FSCHECK            (1 << TIF_FSCHECK)
 114 #define _TIF_32BIT              (1 << TIF_32BIT)
 115 #define _TIF_SVE                (1 << TIF_SVE)
 116
 117 #define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
 118                                  _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
 119                                  _TIF_UPROBE | _TIF_FSCHECK)
 120
 121 #define _TIF_SYSCALL_WORK       (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
 122                                  _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
 123                                  _TIF_NOHZ)
 124
 125 #define INIT_THREAD_INFO(tsk)                                           \
 126 {                                                                       \
 127         .flags          = _TIF_FOREIGN_FPSTATE,                         \
 128         .preempt_count  = INIT_PREEMPT_COUNT,                           \
 129         .addr_limit     = KERNEL_DS,                                    \
 130 }
 131
 132 #endif /* __KERNEL__ */
 133 #endif /* __ASM_THREAD_INFO_H */