/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_COMPAT_H
#define __ASM_COMPAT_H
#ifdef __KERNEL__

#include <asm-generic/compat.h>

#ifdef CONFIG_COMPAT

/*
 * Architecture specific compatibility types
 */
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>

#define COMPAT_USER_HZ          100
#ifdef __AARCH64EB__
#define COMPAT_UTS_MACHINE      "armv8b\0\0"
#else
#define COMPAT_UTS_MACHINE      "armv8l\0\0"
#endif

typedef u16             __compat_uid_t;
typedef u16             __compat_gid_t;
typedef u16             __compat_uid16_t;
typedef u16             __compat_gid16_t;
typedef u32             __compat_uid32_t;
typedef u32             __compat_gid32_t;
typedef u16             compat_mode_t;
typedef u32             compat_dev_t;
typedef s32             compat_nlink_t;
typedef u16             compat_ipc_pid_t;
typedef u32             compat_caddr_t;
typedef __kernel_fsid_t compat_fsid_t;
typedef s64             compat_s64;
typedef u64             compat_u64;

struct compat_stat {
#ifdef __AARCH64EB__
        short           st_dev;
        short           __pad1;
#else
        compat_dev_t    st_dev;
#endif
        compat_ino_t    st_ino;
        compat_mode_t   st_mode;
        compat_ushort_t st_nlink;
        __compat_uid16_t        st_uid;
        __compat_gid16_t        st_gid;
#ifdef __AARCH64EB__
        short           st_rdev;
        short           __pad2;
#else
        compat_dev_t    st_rdev;
#endif
        compat_off_t    st_size;
        compat_off_t    st_blksize;
        compat_off_t    st_blocks;
        compat_time_t   st_atime;
        compat_ulong_t  st_atime_nsec;
        compat_time_t   st_mtime;
        compat_ulong_t  st_mtime_nsec;
        compat_time_t   st_ctime;
        compat_ulong_t  st_ctime_nsec;
        compat_ulong_t  __unused4[2];
};

struct compat_flock {
        short           l_type;
        short           l_whence;
        compat_off_t    l_start;
        compat_off_t    l_len;
        compat_pid_t    l_pid;
};

#define F_GETLK64       12      /*  using 'struct flock64' */
#define F_SETLK64       13
#define F_SETLKW64      14

struct compat_flock64 {
        short           l_type;
        short           l_whence;
        compat_loff_t   l_start;
        compat_loff_t   l_len;
        compat_pid_t    l_pid;
};

struct compat_statfs {
        int             f_type;
        int             f_bsize;
        int             f_blocks;
        int             f_bfree;
        int             f_bavail;
        int             f_files;
        int             f_ffree;
        compat_fsid_t   f_fsid;
        int             f_namelen;      /* SunOS ignores this field. */
        int             f_frsize;
        int             f_flags;
        int             f_spare[4];
};

#define COMPAT_RLIM_INFINITY            0xffffffff

typedef u32             compat_old_sigset_t;

#define _COMPAT_NSIG            64
#define _COMPAT_NSIG_BPW        32

typedef u32             compat_sigset_word;

#define COMPAT_OFF_T_MAX        0x7fffffff

#define compat_user_stack_pointer() (user_stack_pointer(task_pt_regs(current)))

static inline void __user *arch_compat_alloc_user_space(long len)
{
        return (void __user *)compat_user_stack_pointer() - len;
}

struct compat_ipc64_perm {
        compat_key_t key;
        __compat_uid32_t uid;
        __compat_gid32_t gid;
        __compat_uid32_t cuid;
        __compat_gid32_t cgid;
        unsigned short mode;
        unsigned short __pad1;
        unsigned short seq;
        unsigned short __pad2;
        compat_ulong_t unused1;
        compat_ulong_t unused2;
};

struct compat_semid64_ds {
        struct compat_ipc64_perm sem_perm;
        compat_ulong_t sem_otime;
        compat_ulong_t sem_otime_high;
        compat_ulong_t sem_ctime;
        compat_ulong_t sem_ctime_high;
        compat_ulong_t sem_nsems;
        compat_ulong_t __unused3;
        compat_ulong_t __unused4;
};

struct compat_msqid64_ds {
        struct compat_ipc64_perm msg_perm;
        compat_ulong_t msg_stime;
        compat_ulong_t msg_stime_high;
        compat_ulong_t msg_rtime;
        compat_ulong_t msg_rtime_high;
        compat_ulong_t msg_ctime;
        compat_ulong_t msg_ctime_high;
        compat_ulong_t msg_cbytes;
        compat_ulong_t msg_qnum;
        compat_ulong_t msg_qbytes;
        compat_pid_t   msg_lspid;
        compat_pid_t   msg_lrpid;
        compat_ulong_t __unused4;
        compat_ulong_t __unused5;
};

struct compat_shmid64_ds {
        struct compat_ipc64_perm shm_perm;
        compat_size_t  shm_segsz;
        compat_ulong_t shm_atime;
        compat_ulong_t shm_atime_high;
        compat_ulong_t shm_dtime;
        compat_ulong_t shm_dtime_high;
        compat_ulong_t shm_ctime;
        compat_ulong_t shm_ctime_high;
        compat_pid_t   shm_cpid;
        compat_pid_t   shm_lpid;
        compat_ulong_t shm_nattch;
        compat_ulong_t __unused4;
        compat_ulong_t __unused5;
};

static inline int is_compat_task(void)
{
        return test_thread_flag(TIF_32BIT);
}

static inline int is_compat_thread(struct thread_info *thread)
{
        return test_ti_thread_flag(thread, TIF_32BIT);
}

#else /* !CONFIG_COMPAT */

static inline int is_compat_thread(struct thread_info *thread)
{
        return 0;
}

#endif /* CONFIG_COMPAT */
#endif /* __KERNEL__ */
#endif /* __ASM_COMPAT_H */