text: #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;
  
  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;
  
  #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.
   */
  typedef u32		compat_uptr_t;
  
  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);
  }
  
  #endif /* _ASM_COMPAT_H */
  