LXR linux/arch/sh/include/asm/thread

   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
  29struct 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 */
  67register unsigned long current_stack_pointer asm("r15") __used;
  68
  69/* how to get the thread information struct from C */
  70static 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
  93extern void arch_task_cache_init(void);
  94extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
  95extern void arch_release_task_struct(struct task_struct *tsk);
  96extern 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 */
 161static 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
 168static 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 */
 179