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/* Table of opcodes for the OpenRISC 1000 ISA.

   Copyright 1990, 1991, 1992, 1993 Free Software Foundation, Inc.

   Copyright (C) 2008 Embecosm Limited

   Contributed by Damjan Lampret (lampret@opencores.org).

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.

   This file is also part of or1k_gen_isa, GDB and GAS.

   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 3 of the License, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

   more details.

   You should have received a copy of the GNU General Public License along

   with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

/* We treat all letters the same in encode/decode routines so

   we need to assign some characteristics to them like signess etc.*/

#ifndef OR32_H_ISA

#define OR32_H_ISA

#define NUM_UNSIGNED (0)

#define NUM_SIGNED (1)

#ifndef PARAMS

#define PARAMS(x) x

#endif

#ifndef CONST

#define CONST const

#endif

#define MAX_GPRS 32

#define PAGE_SIZE 8192

#undef __HALF_WORD_INSN__

#define OPERAND_DELIM (',')

#define OR32_IF_DELAY (1)

#define OR32_W_FLAG   (2)

#define OR32_R_FLAG   (4)

#if defined(HAVE_EXECUTION)

# if SIMPLE_EXECUTION

#  include "simpl32-defs.h"

# elif DYNAMIC_EXECUTION

#  include "dyn32-defs.h"

# else

extern void l_none PARAMS((void));

# endif

#else

extern void l_none PARAMS((void));

#endif

struct or32_letter {

  char letter;

  int  sign;

  /* int  reloc; relocation per letter ??*/

};

enum insn_type {

 it_unknown,

 it_exception,

 it_arith,

 it_shift,

 it_compare,

 it_branch,

 it_jump,

 it_load,

 it_store,

 it_movimm,

 it_move,

 it_extend,

 it_nop,

 it_mac,

 it_float };

/* Main instruction specification array.  */

struct or32_opcode {

  /* Name of the instruction.  */

  char *name;

  /* A string of characters which describe the operands.

     Valid characters are:

     ,() Itself.  Characters appears in the assembly code.

     rA  Register operand.

     rB  Register operand.

     rD  Register operand (destination).

     I   An immediate operand, range -32768 to 32767.

     J   An immediate operand, range . (unused)

     K   An immediate operand, range 0 to 65535.

     L   An immediate operand, range 0 to 63.

     M   An immediate operand, range . (unused)

     N   An immediate operand, range -33554432 to 33554431.

     O   An immediate operand, range . (unused) */

  char *args;

  /* Opcode and operand encoding. */

  char *encoding;

#ifdef HAVE_EXECUTION

# if COMPLEX_EXECUTION

  char *function_name;

# elif SIMPLE_EXECUTION

  void (*exec)(struct iqueue_entry *);

# else /* DYNAMIC_EXECUTION */

  void (*exec)(struct op_queue *opq, int param_t[3], int);

# endif

#else  /* HAVE_EXECUTION */

  void (*exec)(void);

#endif

  unsigned int flags;

  enum insn_type func_unit;

};

/* This operand is the last in the list */

#define OPTYPE_LAST (0x80000000)

/* This operand marks the end of the operand sequence (for things like I(rD)) */

#define OPTYPE_OP   (0x40000000)

/* The operand specifies a register index */

#define OPTYPE_REG  (0x20000000)

/* The operand must be sign extended */

#define OPTYPE_SIG  (0x10000000)

/* Operand is a relative address, the `I' in `I(rD)' */

#define OPTYPE_DIS  (0x08000000)

/* The operand is a destination */

#define OPTYPE_DST  (0x04000000)

/* Which bit of the operand is the sign bit */

#define OPTYPE_SBIT (0x00001F00)

/* Amount to shift the instruction word right to get the operand */

#define OPTYPE_SHR  (0x0000001F)

#define OPTYPE_SBIT_SHR (8)

/* MM: Data how to decode operands.  */

extern struct insn_op_struct {

  unsigned long type;

  unsigned long data;

} **op_start;

/* Leaf flag used in automata building */

#define LEAF_FLAG         (0x80000000)

struct temp_insn_struct

{

  unsigned long insn;

  unsigned long insn_mask;

  int in_pass;

};

extern unsigned long *automata;

extern struct temp_insn_struct *ti;

extern CONST struct or32_letter or32_letters[];

extern CONST struct  or32_opcode or32_opcodes[];

extern CONST int num_opcodes;

extern char *disassembled;

/* Calculates instruction length in bytes.  Always 4 for OR32. */

extern int insn_len PARAMS((int insn_index));

/* Is individual insn's operand signed or unsigned? */

extern int letter_signed PARAMS((char l));

/* Number of letters in the individual lettered operand. */

extern int letter_range PARAMS((char l));

/* MM: Returns index of given instruction name.  */

extern int insn_index PARAMS((char *insn));

/* MM: Returns instruction name from index.  */

extern CONST char *insn_name PARAMS ((int index));

/* MM: Constructs new FSM, based on or32_opcodes.  */

extern void build_automata PARAMS ((void));

/* MM: Destructs FSM.  */

extern void destruct_automata PARAMS ((void));

/* MM: Decodes instruction using FSM.  Call build_automata first.  */

extern int insn_decode PARAMS((unsigned int insn));

/* Disassemble one instruction from insn to disassemble.

   Return the size of the instruction.  */

int disassemble_insn (unsigned long insn);

/* Disassemble one instruction from insn index.

   Return the size of the instruction.  */

int disassemble_index (unsigned long insn, int index);

/* FOR INTERNAL USE ONLY */

/* Automatically does zero- or sign- extension and also finds correct

   sign bit position if sign extension is correct extension. Which extension

   is proper is figured out from letter description. */

unsigned long extend_imm(unsigned long imm, char l);

/* Extracts value from opcode */

unsigned long or32_extract(char param_ch, char *enc_initial, unsigned long insn);

#endif