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/* ia64-asmtab.h -- Header for compacted IA-64 opcode tables.
Copyright (C) 1999 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
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