Subversion Repositories openrisc_2011-10-31

/* Table of opcodes for the OpenRISC 1000 ISA.

   Copyright 2002, 2003 Free Software Foundation, Inc.

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

   This file is part of or1k_gen_isa, or1ksim, 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 2 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, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

/* 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)

#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(HAS_EXECUTION)

# if SIMPLE_EXECUTION

#  include "simpl32_defs.h"

# elif DYNAMIC_EXECUTION

#  include "dyn32_defs.h"

# else

extern void l_none (void);

# endif

#else

extern void l_none (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.

     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 HAS_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], orreg_t param[3], int);

# endif

#else  /* HAS_EXECUTION */

  void (*exec)(void);

#endif

  unsigned int flags;

  enum insn_type func_unit;

};

#define OPTYPE_LAST (0x80000000)

#define OPTYPE_OP   (0x40000000)

#define OPTYPE_REG  (0x20000000)

#define OPTYPE_SIG  (0x10000000)

#define OPTYPE_DIS  (0x08000000)

#define OPTYPE_DST  (0x04000000)

#define OPTYPE_SBIT (0x00001F00)

#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 unsigned int or32_num_opcodes;

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

extern int insn_len (int);

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

extern int letter_signed (char);

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

extern int letter_range (char);

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

extern int insn_index (char *);

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

extern const char *insn_name (int);

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

extern void build_automata (void);

/* MM: Destructs FSM.  */

extern void destruct_automata (void);

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

extern int insn_decode (unsigned int);

/* Disassemble one instruction from insn to disassemble.

   Return the size of the instruction.  */

int disassemble_insn (unsigned long);

/* Extract instruction */

extern unsigned long insn_extract(char,char*);

/* Disassemble one instruction from insn index.

   Return the size of the instruction.  */

int disassemble_index (unsigned long,int);

/* 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,char);

#endif