text: #ifndef __UREG_H
  #define __UREG_H
  #if !defined(_PLAN9_SOURCE)
      This header file is an extension to ANSI/POSIX
  #endif
  
  struct Ureg
  {
  	unsigned long	r0;
  	unsigned long	r1;
  	unsigned long	r2;
  	unsigned long	r3;
  	unsigned long	r4;
  	unsigned long	r5;
  	unsigned long	r6;
  	unsigned long	r7;
  	unsigned long	r8;
  	unsigned long	r9;
  	unsigned long	r10;
  	unsigned long	r11;
  	unsigned long	r12;	/* sb */
  	union {
  		unsigned long	r13;
  		unsigned long	sp;
  	};
  	union {
  		unsigned long	r14;
  		unsigned long	link;
  	};
  	unsigned long	type;	/* of exception */
  	unsigned long	psr;
  	unsigned long	pc;	/* interrupted addr */
  };
  
  #endif
  