root/arch/sh/include/asm/thread_info.h

INCLUDED FROM

DEFINITIONS

1. current_thread_info
2. set_thread_fault_code
3. get_thread_fault_code

   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 #ifdef __KERNEL__
  14 
  15 #include <asm/page.h>
  16 
  17 /*
  18  * Page fault error code bits
  19  */
  20 #define FAULT_CODE_WRITE        (1 << 0)        /* write access */
  21 #define FAULT_CODE_INITIAL      (1 << 1)        /* initial page write */
  22 #define FAULT_CODE_ITLB         (1 << 2)        /* ITLB miss */
  23 #define FAULT_CODE_PROT         (1 << 3)        /* protection fault */
  24 #define FAULT_CODE_USER         (1 << 4)        /* user-mode access */
  25 
  26 #ifndef __ASSEMBLY__
  27 #include <asm/processor.h>
  28 
  29 struct thread_info {
  30         struct task_struct      *task;          /* main task structure */
  31         unsigned long           flags;          /* low level flags */
  32         __u32                   status;         /* thread synchronous flags */
  33         __u32                   cpu;
  34         int                     preempt_count; /* 0 => preemptable, <0 => BUG */
  35         mm_segment_t            addr_limit;     /* thread address space */
  36         unsigned long           previous_sp;    /* sp of previous stack in case
  37                                                    of nested IRQ stacks */
  38         __u8                    supervisor_stack[0];
  39 };
  40 
  41 #endif
  42 
  43 #if defined(CONFIG_4KSTACKS)
  44 #define THREAD_SHIFT    12
  45 #else
  46 #define THREAD_SHIFT    13
  47 #endif
  48 
  49 #define THREAD_SIZE     (1 << THREAD_SHIFT)
  50 #define STACK_WARN      (THREAD_SIZE >> 3)
  51 
  52 /*
  53  * macros/functions for gaining access to the thread information structure
  54  */
  55 #ifndef __ASSEMBLY__
  56 #define INIT_THREAD_INFO(tsk)                   \
  57 {                                               \
  58         .task           = &tsk,                 \
  59         .flags          = 0,                    \
  60         .status         = 0,                    \
  61         .cpu            = 0,                    \
  62         .preempt_count  = INIT_PREEMPT_COUNT,   \
  63         .addr_limit     = KERNEL_DS,            \
  64 }
  65 
  66 /* how to get the current stack pointer from C */
  67 register unsigned long current_stack_pointer asm("r15") __used;
  68 
  69 /* how to get the thread information struct from C */
  70 static inline struct thread_info *current_thread_info(void)
  71 {
  72         struct thread_info *ti;
  73 #if defined(CONFIG_SUPERH64)
  74         __asm__ __volatile__ ("getcon   cr17, %0" : "=r" (ti));
  75 #elif defined(CONFIG_CPU_HAS_SR_RB)
  76         __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
  77 #else
  78         unsigned long __dummy;
  79 
  80         __asm__ __volatile__ (
  81                 "mov    r15, %0\n\t"
  82                 "and    %1, %0\n\t"
  83                 : "=&r" (ti), "=r" (__dummy)
  84                 : "1" (~(THREAD_SIZE - 1))
  85                 : "memory");
  86 #endif
  87 
  88         return ti;
  89 }
  90 
  91 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
  92 
  93 extern void arch_task_cache_init(void);
  94 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
  95 extern void arch_release_task_struct(struct task_struct *tsk);
  96 extern void init_thread_xstate(void);
  97 
  98 #endif /* __ASSEMBLY__ */
  99 
 100 /*
 101  * Thread information flags
 102  *
 103  * - Limited to 24 bits, upper byte used for fault code encoding.
 104  *
 105  * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
 106  *   we blow the tst immediate size constraints and need to fix up
 107  *   arch/sh/kernel/entry-common.S.
 108  */
 109 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 110 #define TIF_SIGPENDING          1       /* signal pending */
 111 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 112 #define TIF_SINGLESTEP          4       /* singlestepping active */
 113 #define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
 114 #define TIF_SECCOMP             6       /* secure computing */
 115 #define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
 116 #define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
 117 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 118 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 119 
 120 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 121 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 122 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 123 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 124 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 125 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
 126 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 127 #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
 128 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 129 
 130 /* work to do in syscall trace */
 131 #define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
 132                                  _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
 133                                  _TIF_SYSCALL_TRACEPOINT)
 134 
 135 /* work to do on any return to u-space */
 136 #define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
 137                                  _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
 138                                  _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
 139                                  _TIF_SYSCALL_TRACEPOINT)
 140 
 141 /* work to do on interrupt/exception return */
 142 #define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
 143                                  _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))
 144 
 145 /*
 146  * Thread-synchronous status.
 147  *
 148  * This is different from the flags in that nobody else
 149  * ever touches our thread-synchronous status, so we don't
 150  * have to worry about atomic accesses.
 151  */
 152 #define TS_USEDFPU              0x0002  /* FPU used by this task this quantum */
 153 
 154 #ifndef __ASSEMBLY__
 155 
 156 #define TI_FLAG_FAULT_CODE_SHIFT        24
 157 
 158 /*
 159  * Additional thread flag encoding
 160  */
 161 static inline void set_thread_fault_code(unsigned int val)
 162 {
 163         struct thread_info *ti = current_thread_info();
 164         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
 165                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
 166 }
 167 
 168 static inline unsigned int get_thread_fault_code(void)
 169 {
 170         struct thread_info *ti = current_thread_info();
 171         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
 172 }
 173 
 174 #endif  /* !__ASSEMBLY__ */
 175 
 176 #endif /* __KERNEL__ */
 177 
 178 #endif /* __ASM_SH_THREAD_INFO_H */