/* registers.h: register frame declarations
   *
   * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version
   * 2 of the License, or (at your option) any later version.
   */
  
  /*
   * notes:
   *
   * (1) that the members of all these structures are carefully aligned to permit
   *     usage of STD/STDF instructions
   *
   * (2) if you change these structures, you must change the code in
   *     arch/frvnommu/kernel/{break.S,entry.S,switch_to.S,gdb-stub.c}
   *
   *
   * the kernel stack space block looks like this:
   *
   *	+0x2000	+----------------------
   *		| union {

   *		|	struct frv_frame0 {
   *		|		struct user_context {
   *		|			struct user_int_regs
   *		|			struct user_fpmedia_regs
   *		|		}
   *		|		struct frv_debug_regs
   *		|	}

   *		|	struct pt_regs [user exception]
   *		| }
   *		+---------------------- <-- __kernel_frame0_ptr (maybe GR28)
   *		|
   *		| kernel stack
   *		|
   *		|......................
   *		| struct pt_regs [kernel exception]
   *		|...................... <-- __kernel_frame0_ptr (maybe GR28)
   *		|
   *		| kernel stack
   *		|
   *		|...................... <-- stack pointer (GR1)
   *		|
   *		| unused stack space
   *		|
   *		+----------------------
   *		| struct thread_info
   *	+0x0000	+---------------------- <-- __current_thread_info (GR15);
   *
   * note that GR28 points to the current exception frame
   */
  
  #ifndef _ASM_REGISTERS_H
  #define _ASM_REGISTERS_H
  
  #ifndef __ASSEMBLY__

  #define __OFFSET(X,N)	((X)+(N)*4)

  #define __OFFSETC(X,N)	xxxxxxxxxxxxxxxxxxxxxxxx
  #else

  #define __OFFSET(X,N)	((X)+(N)*4)
  #define __OFFSETC(X,N)	((X)+(N))

  #endif
  
  /*****************************************************************************/
  /*
   * Exception/Interrupt frame
   * - held on kernel stack
   * - 8-byte aligned on stack (old SP is saved in frame)
   * - GR0 is fixed 0, so we don't save it
   */
  #ifndef __ASSEMBLY__
  
  struct pt_regs {
  	unsigned long		psr;		/* Processor Status Register */
  	unsigned long		isr;		/* Integer Status Register */
  	unsigned long		ccr;		/* Condition Code Register */
  	unsigned long		cccr;		/* Condition Code for Conditional Insns Register */
  	unsigned long		lr;		/* Link Register */
  	unsigned long		lcr;		/* Loop Count Register */
  	unsigned long		pc;		/* Program Counter Register */
  	unsigned long		__status;	/* exception status */
  	unsigned long		syscallno;	/* syscall number or -1 */
  	unsigned long		orig_gr8;	/* original syscall arg #1 */
  	unsigned long		gner0;
  	unsigned long		gner1;
  	unsigned long long	iacc0;
  	unsigned long		tbr;		/* GR0 is fixed zero, so we use this for TBR */
  	unsigned long		sp;		/* GR1: USP/KSP */
  	unsigned long		fp;		/* GR2: FP */
  	unsigned long		gr3;
  	unsigned long		gr4;
  	unsigned long		gr5;
  	unsigned long		gr6;
  	unsigned long		gr7;		/* syscall number */
  	unsigned long		gr8;		/* 1st syscall param; syscall return */
  	unsigned long		gr9;		/* 2nd syscall param */
  	unsigned long		gr10;		/* 3rd syscall param */
  	unsigned long		gr11;		/* 4th syscall param */
  	unsigned long		gr12;		/* 5th syscall param */
  	unsigned long		gr13;		/* 6th syscall param */
  	unsigned long		gr14;
  	unsigned long		gr15;
  	unsigned long		gr16;		/* GP pointer */
  	unsigned long		gr17;		/* small data */
  	unsigned long		gr18;		/* PIC/PID */
  	unsigned long		gr19;
  	unsigned long		gr20;
  	unsigned long		gr21;
  	unsigned long		gr22;
  	unsigned long		gr23;
  	unsigned long		gr24;
  	unsigned long		gr25;
  	unsigned long		gr26;
  	unsigned long		gr27;
  	struct pt_regs		*next_frame;	/* GR28 - next exception frame */
  	unsigned long		gr29;		/* GR29 - OS reserved */
  	unsigned long		gr30;		/* GR30 - OS reserved */
  	unsigned long		gr31;		/* GR31 - OS reserved */
  } __attribute__((aligned(8)));
  
  #endif

  #define REG__STATUS_STEP	0x00000001	/* - reenable single stepping on return */
  #define REG__STATUS_STEPPED	0x00000002	/* - single step caused exception */
  #define REG__STATUS_BROKE	0x00000004	/* - BREAK insn caused exception */
  #define REG__STATUS_SYSC_ENTRY	0x40000000	/* - T on syscall entry (ptrace.c only) */
  #define REG__STATUS_SYSC_EXIT	0x80000000	/* - T on syscall exit (ptrace.c only) */

  #define REG_GR(R)	__OFFSET(REG_GR0, (R))

  
  #define REG_SP		REG_GR(1)
  #define REG_FP		REG_GR(2)
  #define REG_PREV_FRAME	REG_GR(28)	/* previous exception frame pointer (old gr28 value) */
  #define REG_CURR_TASK	REG_GR(29)	/* current task */
  
  /*****************************************************************************/
  /*

   * debugging registers

   */
  #ifndef __ASSEMBLY__

  struct frv_debug_regs

  {

  	unsigned long		dcr;

  	unsigned long		ibar[4] __attribute__((aligned(8)));
  	unsigned long		dbar[4] __attribute__((aligned(8)));
  	unsigned long		dbdr[4][4] __attribute__((aligned(8)));
  	unsigned long		dbmr[4][4] __attribute__((aligned(8)));

  } __attribute__((aligned(8)));
  
  #endif

  /*****************************************************************************/
  /*
   * userspace registers
   */
  #ifndef __ASSEMBLY__
  
  struct user_int_regs
  {
  	/* integer registers
  	 * - up to gr[31] mirror pt_regs
  	 * - total size must be multiple of 8 bytes
  	 */
  	unsigned long		psr;		/* Processor Status Register */
  	unsigned long		isr;		/* Integer Status Register */
  	unsigned long		ccr;		/* Condition Code Register */
  	unsigned long		cccr;		/* Condition Code for Conditional Insns Register */
  	unsigned long		lr;		/* Link Register */
  	unsigned long		lcr;		/* Loop Count Register */
  	unsigned long		pc;		/* Program Counter Register */
  	unsigned long		__status;	/* exception status */
  	unsigned long		syscallno;	/* syscall number or -1 */
  	unsigned long		orig_gr8;	/* original syscall arg #1 */
  	unsigned long		gner[2];
  	unsigned long long	iacc[1];
  
  	union {
  		unsigned long	tbr;
  		unsigned long	gr[64];
  	};
  };
  
  struct user_fpmedia_regs
  {
  	/* FP/Media registers */
  	unsigned long	fr[64];
  	unsigned long	fner[2];
  	unsigned long	msr[2];
  	unsigned long	acc[8];
  	unsigned char	accg[8];
  	unsigned long	fsr[1];
  };
  
  struct user_context
  {
  	struct user_int_regs		i;
  	struct user_fpmedia_regs	f;
  
  	/* we provide a context extension so that we can save the regs for CPUs that
  	 * implement many more of Fujitsu's lavish register spec
  	 */
  	void *extension;
  } __attribute__((aligned(8)));

  struct frv_frame0 {
  	union {
  		struct pt_regs		regs;
  		struct user_context	uc;
  	};
  
  	struct frv_debug_regs		debug;
  
  } __attribute__((aligned(32)));

  #endif

  #define __INT_GR(R)		__OFFSET(__INT_GR0,		(R))
  
  #define __FPMEDIA_FR(R)		__OFFSET(__FPMEDIA_FR0,		(R))
  #define __FPMEDIA_FNER(R)	__OFFSET(__FPMEDIA_FNER0,	(R))
  #define __FPMEDIA_MSR(R)	__OFFSET(__FPMEDIA_MSR0,	(R))
  #define __FPMEDIA_ACC(R)	__OFFSET(__FPMEDIA_ACC0,	(R))
  #define __FPMEDIA_ACCG(R)	__OFFSETC(__FPMEDIA_ACCG0,	(R))
  #define __FPMEDIA_FSR(R)	__OFFSET(__FPMEDIA_FSR0,	(R))
  
  #define __THREAD_GR(R)		__OFFSET(__THREAD_GR16,		(R) - 16)

  
  #endif /* _ASM_REGISTERS_H */