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