compat.h

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#ifndef _ASM_COMPAT_H
#define _ASM_COMPAT_H
/*
 * Architecture specific compatibility types
 */
#include <linux/thread_info.h>
#include <linux/types.h>
#include <asm/page.h>
#include <asm/ptrace.h>

#define COMPAT_USER_HZ      100
#define COMPAT_UTS_MACHINE  "mips\0\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_suseconds_t;

typedef s32     compat_pid_t;
typedef s32     __compat_uid_t;
typedef s32     __compat_gid_t;
typedef __compat_uid_t  __compat_uid32_t;
typedef __compat_gid_t  __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 u32     compat_nlink_t;
typedef s32     compat_ipc_pid_t;
typedef s32     compat_daddr_t;
typedef s32     compat_caddr_t;
typedef struct {
    s32 val[2];
} compat_fsid_t;
typedef s32     compat_timer_t;
typedef s32     compat_key_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;
    s32     st_pad1[3];
    compat_ino_t    st_ino;
    compat_mode_t   st_mode;
    compat_nlink_t  st_nlink;
    __compat_uid_t  st_uid;
    __compat_gid_t  st_gid;
    compat_dev_t    st_rdev;
    s32     st_pad2[2];
    compat_off_t    st_size;
    s32     st_pad3;
    compat_time_t   st_atime;
    s32     st_atime_nsec;
    compat_time_t   st_mtime;
    s32     st_mtime_nsec;
    compat_time_t   st_ctime;
    s32     st_ctime_nsec;
    s32     st_blksize;
    s32     st_blocks;
    s32     st_pad4[14];
};

struct compat_flock {
    short       l_type;
    short       l_whence;
    compat_off_t    l_start;
    compat_off_t    l_len;
    s32     l_sysid;
    compat_pid_t    l_pid;
    short       __unused;
    s32     pad[4];
};

#define F_GETLK64   33
#define F_SETLK64   34
#define F_SETLKW64  35

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_frsize;
    int     f_blocks;
    int     f_bfree;
    int     f_files;
    int     f_ffree;
    int     f_bavail;
    compat_fsid_t   f_fsid;
    int     f_namelen;
    int     f_flags;
    int     f_spare[5];
};

#define COMPAT_RLIM_INFINITY    0x7fffffffUL

typedef u32     compat_old_sigset_t;    /* at least 32 bits */

#define _COMPAT_NSIG        128     /* Don't ask !$@#% ...  */
#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;

#define SI_PAD_SIZE32   (128/sizeof(int) - 3)

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

    union {
        int _pad[SI_PAD_SIZE32];

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

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

        /* IRIX SIGCHLD */
        struct {
            compat_pid_t _pid;  /* which child */
            compat_clock_t _utime;
            int _status;        /* exit code */
            compat_clock_t _stime;
        } _irix_sigchld;

        /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
        struct {
            s32 _addr; /* faulting insn/memory ref. */
        } _sigfault;

        /* SIGPOLL, SIGXFSZ (To do ...)  */
        struct {
            int _band;  /* POLL_IN, POLL_OUT, POLL_MSG */
            int _fd;
        } _sigpoll;

        /* POSIX.1b timers */
        struct {
            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_uid_t _uid;    /* sender's uid */
            compat_sigval_t _sigval;
        } _rt;

    } _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)
{
    /* cast to a __user pointer via "unsigned long" makes sparse happy */
    return (void __user *)(unsigned long)(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 = (struct pt_regs *)
        ((unsigned long) current_thread_info() + THREAD_SIZE - 32) - 1;

    return (void __user *) (regs->regs[29] - 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;
    compat_mode_t mode;
    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_time_t   sem_ctime;
    compat_ulong_t  sem_nsems;
    compat_ulong_t  __unused1;
    compat_ulong_t  __unused2;
};

struct compat_msqid64_ds {
    struct compat_ipc64_perm msg_perm;
#ifndef CONFIG_CPU_LITTLE_ENDIAN
    compat_ulong_t  __unused1;
#endif
    compat_time_t   msg_stime;
#ifdef CONFIG_CPU_LITTLE_ENDIAN
    compat_ulong_t  __unused1;
#endif
#ifndef CONFIG_CPU_LITTLE_ENDIAN
    compat_ulong_t  __unused2;
#endif
    compat_time_t   msg_rtime;
#ifdef CONFIG_CPU_LITTLE_ENDIAN
    compat_ulong_t  __unused2;
#endif
#ifndef CONFIG_CPU_LITTLE_ENDIAN
    compat_ulong_t  __unused3;
#endif
    compat_time_t   msg_ctime;
#ifdef CONFIG_CPU_LITTLE_ENDIAN
    compat_ulong_t  __unused3;
#endif
    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_time_t   shm_dtime;
    compat_time_t   shm_ctime;
    compat_pid_t    shm_cpid;
    compat_pid_t    shm_lpid;
    compat_ulong_t  shm_nattch;
    compat_ulong_t  __unused1;
    compat_ulong_t  __unused2;
};

static inline int is_compat_task(void)
{
    return test_thread_flag(TIF_32BIT_ADDR);
}

#endif /* _ASM_COMPAT_H */