text: #ifndef _ASM_S390X_COMPAT_H
  #define _ASM_S390X_COMPAT_H
  /*
   * Architecture specific compatibility types
   */
  #include <linux/types.h>
  #include <linux/sched.h>
  #include <linux/thread_info.h>
  
  #define __TYPE_IS_PTR(t) (!__builtin_types_compatible_p(typeof(0?(t)0:0ULL), u64))
  
  #define __SC_DELOUSE(t,v) ({ \
  	BUILD_BUG_ON(sizeof(t) > 4 && !__TYPE_IS_PTR(t)); \
  	(t)(__TYPE_IS_PTR(t) ? ((v) & 0x7fffffff) : (v)); \
  })
  
  #define PSW32_MASK_PER		0x40000000UL
  #define PSW32_MASK_DAT		0x04000000UL
  #define PSW32_MASK_IO		0x02000000UL
  #define PSW32_MASK_EXT		0x01000000UL
  #define PSW32_MASK_KEY		0x00F00000UL
  #define PSW32_MASK_BASE		0x00080000UL	/* Always one */
  #define PSW32_MASK_MCHECK	0x00040000UL
  #define PSW32_MASK_WAIT		0x00020000UL
  #define PSW32_MASK_PSTATE	0x00010000UL
  #define PSW32_MASK_ASC		0x0000C000UL
  #define PSW32_MASK_CC		0x00003000UL
  #define PSW32_MASK_PM		0x00000f00UL
  #define PSW32_MASK_RI		0x00000080UL
  
  #define PSW32_MASK_USER		0x0000FF00UL
  
  #define PSW32_ADDR_AMODE	0x80000000UL
  #define PSW32_ADDR_INSN		0x7FFFFFFFUL
  
  #define PSW32_DEFAULT_KEY	(((u32) PAGE_DEFAULT_ACC) << 20)
  
  #define PSW32_ASC_PRIMARY	0x00000000UL
  #define PSW32_ASC_ACCREG	0x00004000UL
  #define PSW32_ASC_SECONDARY	0x00008000UL
  #define PSW32_ASC_HOME		0x0000C000UL
  
  #define PSW32_USER_BITS (PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT | \
  			 PSW32_DEFAULT_KEY | PSW32_MASK_BASE | \
  			 PSW32_MASK_MCHECK | PSW32_MASK_PSTATE | \
  			 PSW32_ASC_PRIMARY)
  
  #define COMPAT_USER_HZ		100
  #define COMPAT_UTS_MACHINE	"s390\0\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_pid_t;
  typedef u16		__compat_uid_t;
  typedef u16		__compat_gid_t;
  typedef u32		__compat_uid32_t;
  typedef u32		__compat_gid32_t;
  typedef u16		compat_mode_t;
  typedef u32		compat_ino_t;
  typedef u16		compat_dev_t;
  typedef s32		compat_off_t;
  typedef s64		compat_loff_t;
  typedef u16		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;
  
  typedef struct {
  	u32 mask;
  	u32 addr;
  } __aligned(8) psw_compat_t;
  
  typedef struct {
  	psw_compat_t psw;
  	u32 gprs[NUM_GPRS];
  	u32 acrs[NUM_ACRS];
  	u32 orig_gpr2;
  } s390_compat_regs;
  
  typedef struct {
  	u32 gprs_high[NUM_GPRS];
  } s390_compat_regs_high;
  
  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;
  	u16		__pad1;
  	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;
  	u16		__pad2;
  	u32		st_size;
  	u32		st_blksize;
  	u32		st_blocks;
  	u32		st_atime;
  	u32		st_atime_nsec;
  	u32		st_mtime;
  	u32		st_mtime_nsec;
  	u32		st_ctime;
  	u32		st_ctime_nsec;
  	u32		__unused4;
  	u32		__unused5;
  };
  
  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
  #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 {
  	u32		f_type;
  	u32		f_bsize;
  	u32		f_blocks;
  	u32		f_bfree;
  	u32		f_bavail;
  	u32		f_files;
  	u32		f_ffree;
  	compat_fsid_t	f_fsid;
  	u32		f_namelen;
  	u32		f_frsize;
  	u32		f_flags;
  	u32		f_spare[4];
  };
  
  struct compat_statfs64 {
  	u32		f_type;
  	u32		f_bsize;
  	u64		f_blocks;
  	u64		f_bfree;
  	u64		f_bavail;
  	u64		f_files;
  	u64		f_ffree;
  	compat_fsid_t	f_fsid;
  	u32		f_namelen;
  	u32		f_frsize;
  	u32		f_flags;
  	u32		f_spare[4];
  };
  
  #define COMPAT_RLIM_OLD_INFINITY	0x7fffffff
  #define COMPAT_RLIM_INFINITY		0xffffffff
  
  typedef u32		compat_old_sigset_t;	/* at least 32 bits */
  
  #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 {
  		int _pad[128/sizeof(int) - 3];
  
  		/* kill() */
  		struct {
  			pid_t	_pid;	/* sender's pid */
  			uid_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 {
  			pid_t			_pid;	/* sender's pid */
  			uid_t			_uid;	/* sender's uid */
  			compat_sigval_t		_sigval;
  		} _rt;
  
  		/* SIGCHLD */
  		struct {
  			pid_t			_pid;	/* which child */
  			uid_t			_uid;	/* sender's uid */
  			int			_status;/* exit code */
  			compat_clock_t		_utime;
  			compat_clock_t		_stime;
  		} _sigchld;
  
  		/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
  		struct {
  			__u32	_addr;	/* faulting insn/memory ref. - pointer */
  		} _sigfault;
  
  		/* SIGPOLL */
  		struct {
  			int	_band;	/* POLL_IN, POLL_OUT, POLL_MSG */
  			int	_fd;
  		} _sigpoll;
  	} _sifields;
  } compat_siginfo_t;
  
  /*
   * How these fields are to be accessed.
   */
  #define si_pid		_sifields._kill._pid
  #define si_uid		_sifields._kill._uid
  #define si_status	_sifields._sigchld._status
  #define si_utime	_sifields._sigchld._utime
  #define si_stime	_sifields._sigchld._stime
  #define si_value	_sifields._rt._sigval
  #define si_int		_sifields._rt._sigval.sival_int
  #define si_ptr		_sifields._rt._sigval.sival_ptr
  #define si_addr		_sifields._sigfault._addr
  #define si_band		_sifields._sigpoll._band
  #define si_fd		_sifields._sigpoll._fd
  #define si_tid		_sifields._timer._tid
  #define si_overrun	_sifields._timer._overrun
  
  #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 & 0x7fffffffUL);
  }
  
  static inline compat_uptr_t ptr_to_compat(void __user *uptr)
  {
  	return (u32)(unsigned long)uptr;
  }
  
  #ifdef CONFIG_COMPAT
  
  static inline int is_compat_task(void)
  {
  	return test_thread_flag(TIF_31BIT);
  }
  
  static inline void __user *arch_compat_alloc_user_space(long len)
  {
  	unsigned long stack;
  
  	stack = KSTK_ESP(current);
  	if (is_compat_task())
  		stack &= 0x7fffffffUL;
  	return (void __user *) (stack - len);
  }
  
  #endif
  
  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 __pad1;
  	unsigned short seq;
  	unsigned short __pad2;
  	unsigned int __unused1;
  	unsigned int __unused2;
  };
  
  struct compat_semid64_ds {
  	struct compat_ipc64_perm sem_perm;
  	compat_time_t  sem_otime;
  	compat_ulong_t __pad1;
  	compat_time_t  sem_ctime;
  	compat_ulong_t __pad2;
  	compat_ulong_t sem_nsems;
  	compat_ulong_t __unused1;
  	compat_ulong_t __unused2;
  };
  
  struct compat_msqid64_ds {
  	struct compat_ipc64_perm msg_perm;
  	compat_time_t   msg_stime;
  	compat_ulong_t __pad1;
  	compat_time_t   msg_rtime;
  	compat_ulong_t __pad2;
  	compat_time_t   msg_ctime;
  	compat_ulong_t __pad3;
  	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 __unused1;
  	compat_ulong_t __unused2;
  };
  
  struct compat_shmid64_ds {
  	struct compat_ipc64_perm shm_perm;
  	compat_size_t  shm_segsz;
  	compat_time_t  shm_atime;
  	compat_ulong_t __pad1;
  	compat_time_t  shm_dtime;
  	compat_ulong_t __pad2;
  	compat_time_t  shm_ctime;
  	compat_ulong_t __pad3;
  	compat_pid_t   shm_cpid;
  	compat_pid_t   shm_lpid;
  	compat_ulong_t shm_nattch;
  	compat_ulong_t __unused1;
  	compat_ulong_t __unused2;
  };
  #endif /* _ASM_S390X_COMPAT_H */
  