1 /* ia64-asmtab.h -- Header for compacted IA-64 opcode tables. 2 Copyright (C) 1999-2016 Free Software Foundation, Inc. 3 Contributed by Bob Manson of Cygnus Support <manson (at) cygnus.com> 4 5 This file is part of the GNU opcodes library. 6 7 This library is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3, or (at your option) 10 any later version. 11 12 It is distributed in the hope that it will be useful, but WITHOUT 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 15 License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this file; see the file COPYING. If not, write to the 19 Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #ifndef IA64_ASMTAB_H 23 #define IA64_ASMTAB_H 24 25 #include "opcode/ia64.h" 26 27 /* The primary opcode table is made up of the following: */ 28 struct ia64_main_table 29 { 30 /* The entry in the string table that corresponds to the name of this 31 opcode. */ 32 unsigned short name_index; 33 34 /* The type of opcode; corresponds to the TYPE field in 35 struct ia64_opcode. */ 36 unsigned char opcode_type; 37 38 /* The number of outputs for this opcode. */ 39 unsigned char num_outputs; 40 41 /* The base insn value for this opcode. It may be modified by completers. */ 42 ia64_insn opcode; 43 44 /* The mask of valid bits in OPCODE. Zeros indicate operand fields. */ 45 ia64_insn mask; 46 47 /* The operands of this instruction. Corresponds to the OPERANDS field 48 in struct ia64_opcode. */ 49 unsigned char operands[5]; 50 51 /* The flags for this instruction. Corresponds to the FLAGS field in 52 struct ia64_opcode. */ 53 short flags; 54 55 /* The tree of completers for this instruction; this is an offset into 56 completer_table. */ 57 short completers; 58 }; 59 60 /* Each instruction has a set of possible "completers", or additional 61 suffixes that can alter the instruction's behavior, and which has 62 potentially different dependencies. 63 64 The completer entries modify certain bits in the instruction opcode. 65 Which bits are to be modified are marked by the BITS, MASK and 66 OFFSET fields. The completer entry may also note dependencies for the 67 opcode. 68 69 These completers are arranged in a DAG; the pointers are indexes 70 into the completer_table array. The completer DAG is searched by 71 find_completer () and ia64_find_matching_opcode (). 72 73 Note that each completer needs to be applied in turn, so that if we 74 have the instruction 75 cmp.lt.unc 76 the completer entries for both "lt" and "unc" would need to be applied 77 to the opcode's value. 78 79 Some instructions do not require any completers; these contain an 80 empty completer entry. Instructions that require a completer do 81 not contain an empty entry. 82 83 Terminal completers (those completers that validly complete an 84 instruction) are marked by having the TERMINAL_COMPLETER flag set. 85 86 Only dependencies listed in the terminal completer for an opcode are 87 considered to apply to that opcode instance. */ 88 89 struct ia64_completer_table 90 { 91 /* The bit value that this completer sets. */ 92 unsigned int bits; 93 94 /* And its mask. 1s are bits that are to be modified in the 95 instruction. */ 96 unsigned int mask; 97 98 /* The entry in the string table that corresponds to the name of this 99 completer. */ 100 unsigned short name_index; 101 102 /* An alternative completer, or -1 if this is the end of the chain. */ 103 short alternative; 104 105 /* A pointer to the DAG of completers that can potentially follow 106 this one, or -1. */ 107 short subentries; 108 109 /* The bit offset in the instruction where BITS and MASK should be 110 applied. */ 111 unsigned char offset : 7; 112 113 unsigned char terminal_completer : 1; 114 115 /* Index into the dependency list table */ 116 short dependencies; 117 }; 118 119 /* This contains sufficient information for the disassembler to resolve 120 the complete name of the original instruction. */ 121 struct ia64_dis_names 122 { 123 /* COMPLETER_INDEX represents the tree of completers that make up 124 the instruction. The LSB represents the top of the tree for the 125 specified instruction. 126 127 A 0 bit indicates to go to the next alternate completer via the 128 alternative field; a 1 bit indicates that the current completer 129 is part of the instruction, and to go down the subentries index. 130 We know we've reached the final completer when we run out of 1 131 bits. 132 133 There is always at least one 1 bit. */ 134 unsigned int completer_index ; 135 136 /* The index in the main_table[] array for the instruction. */ 137 unsigned short insn_index : 11; 138 139 /* If set, the next entry in this table is an alternate possibility 140 for this instruction encoding. Which one to use is determined by 141 the instruction type and other factors (see opcode_verify ()). */ 142 unsigned int next_flag : 1; 143 144 /* The disassembly priority of this entry among instructions. */ 145 unsigned short priority; 146 }; 147 148 #endif 149
