compat.h

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/*
 * 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__
#ifdef CONFIG_COMPAT

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

#define COMPAT_USER_HZ      100
#define COMPAT_UTS_MACHINE  "armv8l\0\0"

typedef u32     compat_size_t;
typedef s32     compat_ssize_t;
typedef s32     compat_time_t;
typedef s32     compat_clock_t;
typedef s32     compat_pid_t;
typedef u32     __compat_uid_t;
typedef u32     __compat_gid_t;
typedef u32     __compat_uid32_t;
typedef u32     __compat_gid32_t;
typedef u32     compat_mode_t;
typedef u32     compat_ino_t;
typedef u32     compat_dev_t;
typedef s32     compat_off_t;
typedef s64     compat_loff_t;
typedef s16     compat_nlink_t;
typedef u16     compat_ipc_pid_t;
typedef s32     compat_daddr_t;
typedef u32     compat_caddr_t;
typedef __kernel_fsid_t compat_fsid_t;
typedef s32     compat_key_t;
typedef s32     compat_timer_t;

typedef s32     compat_int_t;
typedef s32     compat_long_t;
typedef s64     compat_s64;
typedef u32     compat_uint_t;
typedef u32     compat_ulong_t;
typedef u64     compat_u64;
typedef u32     compat_uptr_t;

struct compat_timespec {
    compat_time_t   tv_sec;
    s32     tv_nsec;
};

struct compat_timeval {
    compat_time_t   tv_sec;
    s32     tv_usec;
};

struct compat_stat {
    compat_dev_t    st_dev;
    compat_ino_t    st_ino;
    compat_mode_t   st_mode;
    compat_nlink_t  st_nlink;
    __compat_uid32_t    st_uid;
    __compat_gid32_t    st_gid;
    compat_dev_t    st_rdev;
    compat_off_t    st_size;
    compat_off_t    st_blksize;
    compat_off_t    st_blocks;
    compat_time_t   st_atime;
    u32     st_atime_nsec;
    compat_time_t   st_mtime;
    u32     st_mtime_nsec;
    compat_time_t   st_ctime;
    u32     st_ctime_nsec;
    u32     __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;

typedef union compat_sigval {
    compat_int_t    sival_int;
    compat_uptr_t   sival_ptr;
} compat_sigval_t;

typedef struct compat_siginfo {
    int si_signo;
    int si_errno;
    int si_code;

    union {
        /* The padding is the same size as AArch64. */
        int _pad[128/sizeof(int) - 3];

        /* kill() */
        struct {
            compat_pid_t _pid;  /* sender's pid */
            __compat_uid32_t _uid;  /* sender's uid */
        } _kill;

        /* POSIX.1b timers */
        struct {
            compat_timer_t _tid;    /* timer id */
            int _overrun;       /* overrun count */
            compat_sigval_t _sigval;    /* same as below */
            int _sys_private;       /* not to be passed to user */
        } _timer;

        /* POSIX.1b signals */
        struct {
            compat_pid_t _pid;  /* sender's pid */
            __compat_uid32_t _uid;  /* sender's uid */
            compat_sigval_t _sigval;
        } _rt;

        /* SIGCHLD */
        struct {
            compat_pid_t _pid;  /* which child */
            __compat_uid32_t _uid;  /* sender's uid */
            int _status;        /* exit code */
            compat_clock_t _utime;
            compat_clock_t _stime;
        } _sigchld;

        /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
        struct {
            compat_uptr_t _addr; /* faulting insn/memory ref. */
            short _addr_lsb; /* LSB of the reported address */
        } _sigfault;

        /* SIGPOLL */
        struct {
            compat_long_t _band;    /* POLL_IN, POLL_OUT, POLL_MSG */
            int _fd;
        } _sigpoll;
    } _sifields;
} compat_siginfo_t;

#define COMPAT_OFF_T_MAX    0x7fffffff
#define COMPAT_LOFF_T_MAX   0x7fffffffffffffffL

/*
 * A pointer passed in from user mode. This should not
 * be used for syscall parameters, just declare them
 * as pointers because the syscall entry code will have
 * appropriately converted them already.
 */

static inline void __user *compat_ptr(compat_uptr_t uptr)
{
    return (void __user *)(unsigned long)uptr;
}

static inline compat_uptr_t ptr_to_compat(void __user *uptr)
{
    return (u32)(unsigned long)uptr;
}

static inline void __user *arch_compat_alloc_user_space(long len)
{
    struct pt_regs *regs = task_pt_regs(current);
    return (void __user *)regs->compat_sp - 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_time_t  sem_otime;
    compat_ulong_t __unused1;
    compat_time_t  sem_ctime;
    compat_ulong_t __unused2;
    compat_ulong_t sem_nsems;
    compat_ulong_t __unused3;
    compat_ulong_t __unused4;
};

struct compat_msqid64_ds {
    struct compat_ipc64_perm msg_perm;
    compat_time_t  msg_stime;
    compat_ulong_t __unused1;
    compat_time_t  msg_rtime;
    compat_ulong_t __unused2;
    compat_time_t  msg_ctime;
    compat_ulong_t __unused3;
    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_time_t  shm_atime;
    compat_ulong_t __unused1;
    compat_time_t  shm_dtime;
    compat_ulong_t __unused2;
    compat_time_t  shm_ctime;
    compat_ulong_t __unused3;
    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_task(void)
{
    return 0;
}

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

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