/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *  arch/arm/include/asm/thread_info.h
 *
 *  Copyright (C) 2002 Russell King.
 */
#ifndef __ASM_ARM_THREAD_INFO_H
#define __ASM_ARM_THREAD_INFO_H

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <asm/fpstate.h>
#include <asm/page.h>

#ifdef CONFIG_KASAN
/*
 * KASan uses a lot of extra stack space so the thread size order needs to
 * be increased.
 */
#define THREAD_SIZE_ORDER       2
#else
#define THREAD_SIZE_ORDER       1
#endif
#define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
#define THREAD_START_SP         (THREAD_SIZE - 8)

#ifdef CONFIG_VMAP_STACK
#define THREAD_ALIGN            (2 * THREAD_SIZE)
#else
#define THREAD_ALIGN            THREAD_SIZE
#endif

#define OVERFLOW_STACK_SIZE     SZ_4K

#ifndef __ASSEMBLY__

struct task_struct;

DECLARE_PER_CPU(struct task_struct *, __entry_task);

#include <asm/types.h>
#include <asm/traps.h>

struct cpu_context_save {
        __u32   r4;
        __u32   r5;
        __u32   r6;
        __u32   r7;
        __u32   r8;
        __u32   r9;
        __u32   sl;
        __u32   fp;
        __u32   sp;
        __u32   pc;
        __u32   extra[2];               /* Xscale 'acc' register, etc */
};

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */
struct thread_info {
        unsigned long           flags;          /* low level flags */
        int                     preempt_count;  /* 0 => preemptable, <0 => bug */
        __u32                   cpu;            /* cpu */
        __u32                   cpu_domain;     /* cpu domain */
        struct cpu_context_save cpu_context;    /* cpu context */
        __u32                   abi_syscall;    /* ABI type and syscall nr */
        unsigned long           tp_value[2];    /* TLS registers */
        union fp_state          fpstate __attribute__((aligned(8)));
        union vfp_state         vfpstate;
#ifdef CONFIG_ARM_THUMBEE
        unsigned long           thumbee_state;  /* ThumbEE Handler Base register */
#endif
};

#define INIT_THREAD_INFO(tsk)                                           \
{                                                                       \
        .flags          = 0,                                            \
        .preempt_count  = INIT_PREEMPT_COUNT,                           \
}

static inline struct task_struct *thread_task(struct thread_info* ti)
{
        return (struct task_struct *)ti;
}

#define thread_saved_pc(tsk)    \
        ((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
#define thread_saved_sp(tsk)    \
        ((unsigned long)(task_thread_info(tsk)->cpu_context.sp))

#ifndef CONFIG_THUMB2_KERNEL
#define thread_saved_fp(tsk)    \
        ((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
#else
#define thread_saved_fp(tsk)    \
        ((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
#endif

extern void iwmmxt_task_disable(struct thread_info *);
extern void iwmmxt_task_copy(struct thread_info *, void *);
extern void iwmmxt_task_restore(struct thread_info *, void *);
extern void iwmmxt_task_release(struct thread_info *);
extern void iwmmxt_task_switch(struct thread_info *);

extern int iwmmxt_undef_handler(struct pt_regs *, u32);

static inline void register_iwmmxt_undef_handler(void)
{
        static struct undef_hook iwmmxt_undef_hook = {
                .instr_mask     = 0x0c000e00,
                .instr_val      = 0x0c000000,
                .cpsr_mask      = MODE_MASK | PSR_T_BIT,
                .cpsr_val       = USR_MODE,
                .fn             = iwmmxt_undef_handler,
        };

        register_undef_hook(&iwmmxt_undef_hook);
}

extern void vfp_sync_hwstate(struct thread_info *);
extern void vfp_flush_hwstate(struct thread_info *);

struct user_vfp;
struct user_vfp_exc;

extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
                                           struct user_vfp_exc *);
extern int vfp_restore_user_hwstate(struct user_vfp *,
                                    struct user_vfp_exc *);
#endif

/*
 * thread information flags:
 *  TIF_USEDFPU         - FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG  - true if poll_idle() is polling TIF_NEED_RESCHED
 *
 * Any bit in the range of 0..15 will cause do_work_pending() to be invoked.
 */
#define TIF_SIGPENDING          0       /* signal pending */
#define TIF_NEED_RESCHED        1       /* rescheduling necessary */
#define TIF_NOTIFY_RESUME       2       /* callback before returning to user */
#define TIF_UPROBE              3       /* breakpointed or singlestepping */
#define TIF_NOTIFY_SIGNAL       4       /* signal notifications exist */

#define TIF_USING_IWMMXT        17
#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK     19
#define TIF_SYSCALL_TRACE       20      /* syscall trace active */
#define TIF_SYSCALL_AUDIT       21      /* syscall auditing active */
#define TIF_SYSCALL_TRACEPOINT  22      /* syscall tracepoint instrumentation */
#define TIF_SECCOMP             23      /* seccomp syscall filtering active */


#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
#define _TIF_UPROBE             (1 << TIF_UPROBE)
#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_SECCOMP            (1 << TIF_SECCOMP)
#define _TIF_NOTIFY_SIGNAL      (1 << TIF_NOTIFY_SIGNAL)
#define _TIF_USING_IWMMXT       (1 << TIF_USING_IWMMXT)

/* Checks for any syscall work in entry-common.S */
#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
                           _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)

/*
 * Change these and you break ASM code in entry-common.S
 */
#define _TIF_WORK_MASK          (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
                                 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
                                 _TIF_NOTIFY_SIGNAL)

#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */