/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_SH_THREAD_INFO_H
#define __ASM_SH_THREAD_INFO_H

/* SuperH version
 * Copyright (C) 2002  Niibe Yutaka
 *
 * The copyright of original i386 version is:
 *
 *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
 *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */
#include <asm/page.h>

/*
 * Page fault error code bits
 */
#define FAULT_CODE_WRITE        (1 << 0)        /* write access */
#define FAULT_CODE_INITIAL      (1 << 1)        /* initial page write */
#define FAULT_CODE_ITLB         (1 << 2)        /* ITLB miss */
#define FAULT_CODE_PROT         (1 << 3)        /* protection fault */
#define FAULT_CODE_USER         (1 << 4)        /* user-mode access */

#ifndef __ASSEMBLER__
#include <asm/processor.h>

struct thread_info {
        struct task_struct      *task;          /* main task structure */
        unsigned long           flags;          /* low level flags */
        __u32                   status;         /* thread synchronous flags */
        __u32                   cpu;
        int                     preempt_count; /* 0 => preemptable, <0 => BUG */
        unsigned long           previous_sp;    /* sp of previous stack in case
                                                   of nested IRQ stacks */
        __u8                    supervisor_stack[];
};

#endif

#if defined(CONFIG_4KSTACKS)
#define THREAD_SHIFT    12
#else
#define THREAD_SHIFT    13
#endif

#define THREAD_SIZE     (1 << THREAD_SHIFT)
#define STACK_WARN      (THREAD_SIZE >> 3)

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLER__
#define INIT_THREAD_INFO(tsk)                   \
{                                               \
        .task           = &tsk,                 \
        .flags          = 0,                    \
        .status         = 0,                    \
        .cpu            = 0,                    \
        .preempt_count  = INIT_PREEMPT_COUNT,   \
}

/* how to get the current stack pointer from C */
register unsigned long current_stack_pointer asm("r15") __used;

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
        struct thread_info *ti;
#if defined(CONFIG_CPU_HAS_SR_RB)
        __asm__ __volatile__ ("stc      r7_bank, %0" : "=r" (ti));
#else
        unsigned long __dummy;

        __asm__ __volatile__ (
                "mov    r15, %0\n\t"
                "and    %1, %0\n\t"
                : "=&r" (ti), "=r" (__dummy)
                : "1" (~(THREAD_SIZE - 1))
                : "memory");
#endif

        return ti;
}

#define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)

extern void init_thread_xstate(void);

#endif /* __ASSEMBLER__ */

/*
 * Thread information flags
 *
 * - Limited to 24 bits, upper byte used for fault code encoding.
 *
 * - _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within 2 bytes, or
 *   we blow the tst immediate size constraints and need to fix up
 *   arch/sh/kernel/entry-common.S.
 */
#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
#define TIF_SIGPENDING          1       /* signal pending */
#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
#define TIF_NOTIFY_SIGNAL       3       /* signal notifications exist */
#define TIF_SINGLESTEP          4       /* singlestepping active */
#define TIF_SYSCALL_AUDIT       5       /* syscall auditing active */
#define TIF_SECCOMP             6       /* secure computing */
#define TIF_NOTIFY_RESUME       7       /* callback before returning to user */
#define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
#define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE              18      /* is terminating due to OOM killer */

#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_SIGNAL      (1 << TIF_NOTIFY_SIGNAL)
#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP            (1 << TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)

/* work to do in syscall trace */
#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
                                 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP    | \
                                 _TIF_SYSCALL_TRACEPOINT)

/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK       (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
                                 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
                                 _TIF_SINGLESTEP    | _TIF_NOTIFY_RESUME   | \
                                 _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK          (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
                                 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 */
#define TS_USEDFPU              0x0002  /* FPU used by this task this quantum */

#ifndef __ASSEMBLER__

#define TI_FLAG_FAULT_CODE_SHIFT        24

/*
 * Additional thread flag encoding
 */
static inline void set_thread_fault_code(unsigned int val)
{
        struct thread_info *ti = current_thread_info();
        ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
                | (val << TI_FLAG_FAULT_CODE_SHIFT);
}

static inline unsigned int get_thread_fault_code(void)
{
        struct thread_info *ti = current_thread_info();
        return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
}

#endif  /* !__ASSEMBLER__ */
#endif /* __ASM_SH_THREAD_INFO_H */