arch/sh/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_SH_THREAD_INFO_H
   3 #define __ASM_SH_THREAD_INFO_H
   4
   5 /* SuperH version
   6  * Copyright (C) 2002  Niibe Yutaka
   7  *
   8  * The copyright of original i386 version is:
   9  *
  10  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
  11  *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
  12  */
  13 #include <asm/page.h>
  14
  15 /*
  16  * Page fault error code bits
  17  */
  18 #define FAULT_CODE_WRITE        (1 << 0)        /* write access */
  19 #define FAULT_CODE_INITIAL      (1 << 1)        /* initial page write */
  20 #define FAULT_CODE_ITLB         (1 << 2)        /* ITLB miss */
  21 #define FAULT_CODE_PROT         (1 << 3)        /* protection fault */
  22 #define FAULT_CODE_USER         (1 << 4)        /* user-mode access */
  23
  24 #ifndef __ASSEMBLY__
  25 #include <asm/processor.h>
  26
  27 struct thread_info {
  28         struct task_struct      *task;          /* main task structure */
  29         unsigned long           flags;          /* low level flags */
  30         __u32                   status;         /* thread synchronous flags */
  31         __u32                   cpu;
  32         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  33         unsigned long           previous_sp;    /* sp of previous stack in case
  34                                                    of nested IRQ stacks */
  35         __u8                    supervisor_stack[0];
  36 };
  37
  38 #endif
  39
  40 #if defined(CONFIG_4KSTACKS)
  41 #define THREAD_SHIFT    12
  42 #else
  43 #define THREAD_SHIFT    13
  44 #endif
  45
  46 #define THREAD_SIZE     (1 << THREAD_SHIFT)
  47 #define STACK_WARN      (THREAD_SIZE >> 3)
  48
  49 /*
  50  * macros/functions for gaining access to the thread information structure
  51  */
  52 #ifndef __ASSEMBLY__
  53 #define INIT_THREAD_INFO(tsk)                   \
  54 {                                               \
  55         .task           = &tsk,                 \
  56         .flags          = 0,                    \
  57         .status         = 0,                    \
  58         .cpu            = 0,                    \
  59         .preempt_count  = INIT_PREEMPT_COUNT,   \
  60 }
  61
  62 /* how to get the current stack pointer from C */
  63 register unsigned long current_stack_pointer asm("r15") __used;
  64
  65 /* how to get the thread information struct from C */
  66 static inline struct thread_info *current_thread_info(void)
  67 {
  68         struct thread_info *ti;
  69 #if defined(CONFIG_CPU_HAS_SR_RB)
  70         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
  71 #else
  72         unsigned long __dummy;
  73
  74         __asm__ __volatile__ (
  75                 "mov    r15, %0\n\t"
  76                 "and    %1, %0\n\t"
  77                 : "=&r" (ti), "=r" (__dummy)
  78                 : "1" (~(THREAD_SIZE - 1))
  79                 : "memory");
  80 #endif
  81
  82         return ti;
  83 }
  84
  85 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  86
  87 extern void arch_task_cache_init(void);
  88 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
  89 extern void arch_release_task_struct(struct task_struct *tsk);
  90 extern void init_thread_xstate(void);
  91
  92 #endif /* __ASSEMBLY__ */
  93
  94 /*
  95  * Thread information flags
  96  *
  97  * - Limited to 24 bits, upper byte used for fault code encoding.
  98  *
  99  * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
 100  *   we blow the tst immediate size constraints and need to fix up
 101  *   arch/sh/kernel/entry-common.S.
 102  */
 103 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 104 #define TIF_SIGPENDING          1       /* signal pending */
 105 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 106 #define TIF_NOTIFY_SIGNAL       3       /* signal notifications exist */
 107 #define TIF_SINGLESTEP          4       /* singlestepping active */
 108 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 109 #define TIF_SECCOMP             6       /* secure computing */
 110 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 111 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
 112 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 113 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 114
 115 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 116 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 117 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 118 #define _TIF_NOTIFY_SIGNAL      (1 << TIF_NOTIFY_SIGNAL)
 119 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 120 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 121 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 122 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 123 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 124 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 125
 126 /* work to do in syscall trace */
 127 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 128                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
 129                                  _TIF_SYSCALL_TRACEPOINT)
 130
 131 /* work to do on any return to u-space */
 132 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 133                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 134                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 135                                  _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL)
 136
 137 /* work to do on interrupt/exception return */
 138 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 139                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 140
 141 /*
 142  * Thread-synchronous status.
 143  *
 144  * This is different from the flags in that nobody else
 145  * ever touches our thread-synchronous status, so we don't
 146  * have to worry about atomic accesses.
 147  */
 148 #define TS_USEDFPU              0x0002  /* FPU used by this task this quantum */
 149
 150 #ifndef __ASSEMBLY__
 151
 152 #define TI_FLAG_FAULT_CODE_SHIFT        24
 153
 154 /*
 155  * Additional thread flag encoding
 156  */
 157 static inline void set_thread_fault_code(unsigned int val)
 158 {
 159         struct thread_info *ti = current_thread_info();
 160         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
 161                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
 162 }
 163
 164 static inline unsigned int get_thread_fault_code(void)
 165 {
 166         struct thread_info *ti = current_thread_info();
 167         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
 168 }
 169
 170 #endif  /* !__ASSEMBLY__ */
 171 #endif /* __ASM_SH_THREAD_INFO_H */