149 lines
5.1 KiB
C
149 lines
5.1 KiB
C
/* ia64-asmtab.h -- Header for compacted IA-64 opcode tables.
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Copyright 1999, 2000 Free Software Foundation, Inc.
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Contributed by Bob Manson of Cygnus Support <manson@cygnus.com>
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This file is part of GDB, GAS, and the GNU binutils.
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GDB, GAS, and the GNU binutils are free software; you can redistribute
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them and/or modify them under the terms of the GNU General Public
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License as published by the Free Software Foundation; either version
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2, or (at your option) any later version.
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GDB, GAS, and the GNU binutils are distributed in the hope that they
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will be useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this file; see the file COPYING. If not, write to the
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Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#ifndef IA64_ASMTAB_H
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#define IA64_ASMTAB_H
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#include "opcode/ia64.h"
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/* The primary opcode table is made up of the following: */
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struct ia64_main_table
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{
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/* The entry in the string table that corresponds to the name of this
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opcode. */
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unsigned short name_index;
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/* The type of opcode; corresponds to the TYPE field in
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struct ia64_opcode. */
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unsigned char opcode_type;
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/* The number of outputs for this opcode. */
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unsigned char num_outputs;
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/* The base insn value for this opcode. It may be modified by completers. */
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ia64_insn opcode;
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/* The mask of valid bits in OPCODE. Zeros indicate operand fields. */
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ia64_insn mask;
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/* The operands of this instruction. Corresponds to the OPERANDS field
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in struct ia64_opcode. */
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unsigned char operands[5];
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/* The flags for this instruction. Corresponds to the FLAGS field in
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struct ia64_opcode. */
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short flags;
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/* The tree of completers for this instruction; this is an offset into
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completer_table. */
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short completers;
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};
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/* Each instruction has a set of possible "completers", or additional
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suffixes that can alter the instruction's behavior, and which has
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potentially different dependencies.
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The completer entries modify certain bits in the instruction opcode.
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Which bits are to be modified are marked by the BITS, MASK and
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OFFSET fields. The completer entry may also note dependencies for the
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opcode.
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These completers are arranged in a DAG; the pointers are indexes
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into the completer_table array. The completer DAG is searched by
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find_completer () and ia64_find_matching_opcode ().
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Note that each completer needs to be applied in turn, so that if we
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have the instruction
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cmp.lt.unc
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the completer entries for both "lt" and "unc" would need to be applied
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to the opcode's value.
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Some instructions do not require any completers; these contain an
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empty completer entry. Instructions that require a completer do
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not contain an empty entry.
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Terminal completers (those completers that validly complete an
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instruction) are marked by having the TERMINAL_COMPLETER flag set.
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Only dependencies listed in the terminal completer for an opcode are
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considered to apply to that opcode instance. */
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struct ia64_completer_table
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{
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/* The bit value that this completer sets. */
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unsigned int bits;
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/* And its mask. 1s are bits that are to be modified in the
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instruction. */
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unsigned int mask;
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/* The entry in the string table that corresponds to the name of this
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completer. */
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unsigned short name_index;
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/* An alternative completer, or -1 if this is the end of the chain. */
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short alternative;
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/* A pointer to the DAG of completers that can potentially follow
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this one, or -1. */
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short subentries;
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/* The bit offset in the instruction where BITS and MASK should be
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applied. */
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unsigned char offset : 7;
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unsigned char terminal_completer : 1;
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/* Index into the dependency list table */
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short dependencies;
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};
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/* This contains sufficient information for the disassembler to resolve
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the complete name of the original instruction. */
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struct ia64_dis_names
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{
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/* COMPLETER_INDEX represents the tree of completers that make up
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the instruction. The LSB represents the top of the tree for the
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specified instruction.
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A 0 bit indicates to go to the next alternate completer via the
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alternative field; a 1 bit indicates that the current completer
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is part of the instruction, and to go down the subentries index.
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We know we've reached the final completer when we run out of 1
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bits.
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There is always at least one 1 bit. */
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unsigned int completer_index : 20;
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/* The index in the main_table[] array for the instruction. */
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unsigned short insn_index : 11;
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/* If set, the next entry in this table is an alternate possibility
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for this instruction encoding. Which one to use is determined by
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the instruction type and other factors (see opcode_verify ()). */
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unsigned int next_flag : 1;
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/* The disassembly priority of this entry among instructions. */
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unsigned short priority;
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};
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#endif
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