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/* ia64-asmtab.h -- Header for compacted IA-64 opcode tables.

   Copyright 1999, 2000 Free Software Foundation, Inc.

   Contributed by Bob Manson of Cygnus Support <manson@cygnus.com>

   This file is part of GDB, GAS, and the GNU binutils.

   GDB, GAS, and the GNU binutils are free software; you can redistribute

   them and/or modify them under the terms of the GNU General Public

   License as published by the Free Software Foundation; either version

   2, or (at your option) any later version.

   GDB, GAS, and the GNU binutils are distributed in the hope that they

   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 file; see the file COPYING.  If not, write to the

   Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA

   02111-1307, USA.  */

#ifndef IA64_ASMTAB_H

#define IA64_ASMTAB_H

#include "opcode/ia64.h"

/* The primary opcode table is made up of the following: */

struct ia64_main_table

{

  /* The entry in the string table that corresponds to the name of this

     opcode. */

  unsigned short name_index;

  /* The type of opcode; corresponds to the TYPE field in

     struct ia64_opcode. */

  unsigned char opcode_type;

  /* The number of outputs for this opcode. */

  unsigned char num_outputs;

  /* The base insn value for this opcode.  It may be modified by completers. */

  ia64_insn opcode;

  /* The mask of valid bits in OPCODE. Zeros indicate operand fields. */

  ia64_insn mask;

  /* The operands of this instruction.  Corresponds to the OPERANDS field

     in struct ia64_opcode. */

  unsigned char operands[5];

  /* The flags for this instruction.  Corresponds to the FLAGS field in

     struct ia64_opcode. */

  short flags;

  /* The tree of completers for this instruction; this is an offset into

     completer_table. */

  short completers;

};

/* Each instruction has a set of possible "completers", or additional

   suffixes that can alter the instruction's behavior, and which has

   potentially different dependencies.

   The completer entries modify certain bits in the instruction opcode.

   Which bits are to be modified are marked by the BITS, MASK and

   OFFSET fields.  The completer entry may also note dependencies for the

   opcode.

   These completers are arranged in a DAG; the pointers are indexes

   into the completer_table array.  The completer DAG is searched by

   find_completer () and ia64_find_matching_opcode ().

   Note that each completer needs to be applied in turn, so that if we

   have the instruction

        cmp.lt.unc

   the completer entries for both "lt" and "unc" would need to be applied

   to the opcode's value.

   Some instructions do not require any completers; these contain an

   empty completer entry.  Instructions that require a completer do

   not contain an empty entry.

   Terminal completers (those completers that validly complete an

   instruction) are marked by having the TERMINAL_COMPLETER flag set.

   Only dependencies listed in the terminal completer for an opcode are

   considered to apply to that opcode instance. */

struct ia64_completer_table

{

  /* The bit value that this completer sets. */

  unsigned int bits;

  /* And its mask. 1s are bits that are to be modified in the

     instruction. */

  unsigned int mask;

  /* The entry in the string table that corresponds to the name of this

     completer. */

  unsigned short name_index;

  /* An alternative completer, or -1 if this is the end of the chain. */

  short alternative;

  /* A pointer to the DAG of completers that can potentially follow

     this one, or -1. */

  short subentries;

  /* The bit offset in the instruction where BITS and MASK should be

     applied. */

  unsigned char offset : 7;

  unsigned char terminal_completer : 1;

  /* Index into the dependency list table */

  short dependencies;

};

/* This contains sufficient information for the disassembler to resolve

   the complete name of the original instruction.  */

struct ia64_dis_names

{

  /* COMPLETER_INDEX represents the tree of completers that make up

     the instruction.  The LSB represents the top of the tree for the

     specified instruction.

     A 0 bit indicates to go to the next alternate completer via the

     alternative field; a 1 bit indicates that the current completer

     is part of the instruction, and to go down the subentries index.

     We know we've reached the final completer when we run out of 1

     bits.

     There is always at least one 1 bit. */

  unsigned int completer_index : 20;

  /* The index in the main_table[] array for the instruction. */

  unsigned short insn_index : 11;

  /* If set, the next entry in this table is an alternate possibility

     for this instruction encoding.  Which one to use is determined by

     the instruction type and other factors (see opcode_verify ()).  */

  unsigned int next_flag : 1;

  /* The disassembly priority of this entry among instructions. */

  unsigned short priority;

};

#endif