#ifndef _LINUX_PERSONALITY_H
  #define _LINUX_PERSONALITY_H

  #ifdef __KERNEL__

  /*
   * Handling of different ABIs (personalities).
   */
  
  struct exec_domain;
  struct pt_regs;
  
  extern int		register_exec_domain(struct exec_domain *);
  extern int		unregister_exec_domain(struct exec_domain *);

  extern int		__set_personality(unsigned int);

  #endif /* __KERNEL__ */

  /*
   * Flags for bug emulation.
   *
   * These occupy the top three bytes.
   */
  enum {

  	UNAME26	=               0x0020000,

  	ADDR_NO_RANDOMIZE = 	0x0040000,	/* disable randomization of VA space */
  	FDPIC_FUNCPTRS =	0x0080000,	/* userspace function ptrs point to descriptors
  						 * (signal handling)
  						 */
  	MMAP_PAGE_ZERO =	0x0100000,
  	ADDR_COMPAT_LAYOUT =	0x0200000,
  	READ_IMPLIES_EXEC =	0x0400000,
  	ADDR_LIMIT_32BIT =	0x0800000,
  	SHORT_INODE =		0x1000000,
  	WHOLE_SECONDS =		0x2000000,
  	STICKY_TIMEOUTS	=	0x4000000,
  	ADDR_LIMIT_3GB = 	0x8000000,
  };
  
  /*
   * Security-relevant compatibility flags that must be
   * cleared upon setuid or setgid exec:
   */

  #define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC  | \
  			    ADDR_NO_RANDOMIZE  | \
  			    ADDR_COMPAT_LAYOUT | \
  			    MMAP_PAGE_ZERO)

  
  /*
   * Personality types.
   *
   * These go in the low byte.  Avoid using the top bit, it will
   * conflict with error returns.
   */
  enum {
  	PER_LINUX =		0x0000,
  	PER_LINUX_32BIT =	0x0000 | ADDR_LIMIT_32BIT,
  	PER_LINUX_FDPIC =	0x0000 | FDPIC_FUNCPTRS,
  	PER_SVR4 =		0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
  	PER_SVR3 =		0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
  	PER_SCOSVR3 =		0x0003 | STICKY_TIMEOUTS |
  					 WHOLE_SECONDS | SHORT_INODE,
  	PER_OSR5 =		0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
  	PER_WYSEV386 =		0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
  	PER_ISCR4 =		0x0005 | STICKY_TIMEOUTS,
  	PER_BSD =		0x0006,
  	PER_SUNOS =		0x0006 | STICKY_TIMEOUTS,
  	PER_XENIX =		0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
  	PER_LINUX32 =		0x0008,
  	PER_LINUX32_3GB =	0x0008 | ADDR_LIMIT_3GB,
  	PER_IRIX32 =		0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */
  	PER_IRIXN32 =		0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */
  	PER_IRIX64 =		0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */
  	PER_RISCOS =		0x000c,
  	PER_SOLARIS =		0x000d | STICKY_TIMEOUTS,
  	PER_UW7 =		0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
  	PER_OSF4 =		0x000f,			 /* OSF/1 v4 */
  	PER_HPUX =		0x0010,
  	PER_MASK =		0x00ff,
  };

  #ifdef __KERNEL__

  
  /*
   * Description of an execution domain.
   * 
   * The first two members are refernced from assembly source
   * and should stay where they are unless explicitly needed.
   */
  typedef void (*handler_t)(int, struct pt_regs *);
  
  struct exec_domain {
  	const char		*name;		/* name of the execdomain */
  	handler_t		handler;	/* handler for syscalls */
  	unsigned char		pers_low;	/* lowest personality */
  	unsigned char		pers_high;	/* highest personality */
  	unsigned long		*signal_map;	/* signal mapping */
  	unsigned long		*signal_invmap;	/* reverse signal mapping */
  	struct map_segment	*err_map;	/* error mapping */
  	struct map_segment	*socktype_map;	/* socket type mapping */
  	struct map_segment	*sockopt_map;	/* socket option mapping */
  	struct map_segment	*af_map;	/* address family mapping */
  	struct module		*module;	/* module context of the ed. */
  	struct exec_domain	*next;		/* linked list (internal) */
  };
  
  /*
   * Return the base personality without flags.
   */
  #define personality(pers)	(pers & PER_MASK)

  
  /*
   * Change personality of the currently running process.
   */
  #define set_personality(pers) \

  	((current->personality == (pers)) ? 0 : __set_personality(pers))

  #endif /* __KERNEL__ */

  #endif /* _LINUX_PERSONALITY_H */