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| 1 : | pazsan | 1.1 | \ generic.fs implements generic assembler definitions 13aug97jaw |
| 2 : | |||
| 3 : | anton | 1.5 | \ Copyright (C) 1998,2000,2003 Free Software Foundation, Inc. |
| 4 : | anton | 1.2 | |
| 5 : | \ This file is part of Gforth. | ||
| 6 : | |||
| 7 : | \ Gforth is free software; you can redistribute it and/or | ||
| 8 : | \ modify it under the terms of the GNU General Public License | ||
| 9 : | \ as published by the Free Software Foundation; either version 2 | ||
| 10 : | \ of the License, or (at your option) any later version. | ||
| 11 : | |||
| 12 : | \ This program is distributed in the hope that it will be useful, | ||
| 13 : | \ but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 : | \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 15 : | \ GNU General Public License for more details. | ||
| 16 : | |||
| 17 : | \ You should have received a copy of the GNU General Public License | ||
| 18 : | \ along with this program; if not, write to the Free Software | ||
| 19 : | anton | 1.3 | \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
| 20 : | pazsan | 1.1 | |
| 21 : | \ These are generic routines to build up a table-driven assembler | ||
| 22 : | \ fo any modern (RISC)-CPU | ||
| 23 : | |||
| 24 : | \ Revision Log: | ||
| 25 : | \ | ||
| 26 : | \ 13aug97jaw-14aug97 Initial Version -> V0.5 | ||
| 27 : | \ ToDo: operand count checking | ||
| 28 : | \ | ||
| 29 : | |||
| 30 : | \ general definitions | ||
| 31 : | |||
| 32 : | : clearstack depth 0 ?DO drop LOOP ; | ||
| 33 : | |||
| 34 : | \ redefinitions to avoid conflicts | ||
| 35 : | |||
| 36 : | ' , ALIAS dic, | ||
| 37 : | ' NOOP ALIAS X | ||
| 38 : | |||
| 39 : | \ ------------ Modes | ||
| 40 : | |||
| 41 : | [IFUNDEF] modes# | ||
| 42 : | 4 Constant modes# | ||
| 43 : | [THEN] | ||
| 44 : | |||
| 45 : | Create modes modes# cells allot \ Modes for differend operands are stored here | ||
| 46 : | \ Example: | ||
| 47 : | \ Offset 0: general modifier ( .B, .W, .L) | ||
| 48 : | \ Offset 1: addressing mode operand 1 | ||
| 49 : | \ Offset 2: addressing mode operand 2 | ||
| 50 : | |||
| 51 : | : Mode-Compare ( adr1 adr2 -- flag ) | ||
| 52 : | modes# | ||
| 53 : | BEGIN dup WHILE >r 2dup @ swap @ <> IF rdrop 2drop false EXIT THEN | ||
| 54 : | cell+ swap cell+ r> 1- | ||
| 55 : | REPEAT drop 2drop true ; | ||
| 56 : | |||
| 57 : | Variable Start-Depth | ||
| 58 : | Variable Mode# | ||
| 59 : | |||
| 60 : | : reset | ||
| 61 : | modes modes# cells erase | ||
| 62 : | 1 Mode# ! | ||
| 63 : | depth Start-Depth ! ; | ||
| 64 : | |||
| 65 : | : Mode! ( n -- ) | ||
| 66 : | Modes Mode# @ cells + ! ; | ||
| 67 : | |||
| 68 : | : +Mode! ( n -- ) | ||
| 69 : | Modes Mode# @ cells + tuck @ or swap ! ; | ||
| 70 : | |||
| 71 : | : 0Mode! ( n -- ) | ||
| 72 : | Modes ! ; | ||
| 73 : | |||
| 74 : | : , | ||
| 75 : | 1 Mode# +! ; | ||
| 76 : | |||
| 77 : | : Mode | ||
| 78 : | Create dic, DOES> @ +Mode! ; | ||
| 79 : | |||
| 80 : | : 0Mode | ||
| 81 : | Create dic, DOES> @ 0Mode! ; | ||
| 82 : | |||
| 83 : | : Reg | ||
| 84 : | Create dic, dic, DOES> dup perform cell+ @ ; | ||
| 85 : | |||
| 86 : | \ --------- Instruction Latch | ||
| 87 : | |||
| 88 : | Create I-Latch 10 chars allot | ||
| 89 : | Variable I-Len | ||
| 90 : | |||
| 91 : | : opc! ( adr len -- ) | ||
| 92 : | dup I-Len @ max I-Len ! | ||
| 93 : | I-Latch -rot bounds DO I c@ over c@ or over c! char+ LOOP drop ; | ||
| 94 : | |||
| 95 : | : I-Init 0 I-Len ! I-Latch 10 erase ; | ||
| 96 : | : I-Flush I-Latch I-len @ bounds DO i c@ X c, LOOP reset ; | ||
| 97 : | |||
| 98 : | : (g!) ( val addr n -1/1 -- ) | ||
| 99 : | dup 0< IF rot 2 pick + 1- -rot THEN | ||
| 100 : | swap >r -rot r> 0 | ||
| 101 : | DO 2dup c! 2 pick + swap 8 rshift swap LOOP | ||
| 102 : | 2drop drop ; | ||
| 103 : | |||
| 104 : | : (g@) ( addr n -1/1 -- val ) | ||
| 105 : | negate dup 0< IF rot 2 pick + 1- -rot THEN | ||
| 106 : | swap >r swap 0 swap r> 0 | ||
| 107 : | DO swap 8 lshift over c@ or swap 2 pick + LOOP | ||
| 108 : | drop nip ; | ||
| 109 : | |||
| 110 : | Variable ByteDirection \ -1 = big endian; 1 = little endian | ||
| 111 : | |||
| 112 : | : g@ ByteDirection @ (g@) ; | ||
| 113 : | : g! ByteDirection @ (g!) ; | ||
| 114 : | |||
| 115 : | \ ---------------- Tables | ||
| 116 : | |||
| 117 : | : >modes ( addr -- addr ) 5 cells + ; | ||
| 118 : | : >data ( addr -- addr ) >modes modes# cells + ; | ||
| 119 : | |||
| 120 : | 0 Value Describ | ||
| 121 : | |||
| 122 : | : Table-Exec ( addr -- ) | ||
| 123 : | to Describ | ||
| 124 : | Describ 2 cells + perform \ to store the opcode | ||
| 125 : | Describ 3 cells + perform \ to store the operands | ||
| 126 : | Describ 4 cells + perform \ to flush the instruction | ||
| 127 : | ; | ||
| 128 : | |||
| 129 : | : 1st-mc ( addr -- flag ) | ||
| 130 : | dup >modes modes Mode-Compare | ||
| 131 : | IF Table-Exec | ||
| 132 : | true | ||
| 133 : | ELSE false | ||
| 134 : | THEN ; | ||
| 135 : | |||
| 136 : | : 1st-always ( addr -- flag ) | ||
| 137 : | Table-Exec true ; | ||
| 138 : | |||
| 139 : | : 1st-thru | ||
| 140 : | dup Table-Exec false ; | ||
| 141 : | |||
| 142 : | : 2nd-opc! | ||
| 143 : | Describ >data count opc! ; | ||
| 144 : | |||
| 145 : | : opcode, | ||
| 146 : | here 0 c, | ||
| 147 : | BEGIN bl word count dup WHILE s>number drop c, | ||
| 148 : | REPEAT 2drop here over - 1- swap c! ; | ||
| 149 : | |||
| 150 : | : modes, | ||
| 151 : | modes# 0 DO I cells modes + @ dic, LOOP ; | ||
| 152 : | |||
| 153 : | 0 Value Table-Link | ||
| 154 : | |||
| 155 : | : Table | ||
| 156 : | Reset | ||
| 157 : | Create here to Table-Link 0 dic, | ||
| 158 : | DOES> I-Init | ||
| 159 : | BEGIN @ dup WHILE dup | ||
| 160 : | cell+ perform \ first element is executed always | ||
| 161 : | \ makes check | ||
| 162 : | ?EXIT | ||
| 163 : | REPEAT -1 ABORT" no valid mode!" | ||
| 164 : | ; | ||
| 165 : | |||
| 166 : | : Follows | ||
| 167 : | ' >body @ Table-Link @ ! ; | ||
| 168 : | |||
| 169 : | : opc, | ||
| 170 : | modes, opcode, clearstack reset ; | ||
| 171 : | |||
| 172 : | : (Opc() | ||
| 173 : | \ Opcode with Operands | ||
| 174 : | ['] 1st-mc dic, | ||
| 175 : | ['] 2nd-opc! dic, | ||
| 176 : | dic, | ||
| 177 : | ['] I-Flush dic, | ||
| 178 : | opc, ; | ||
| 179 : | |||
| 180 : | : (Opc) | ||
| 181 : | \ Opcode without Operands | ||
| 182 : | ['] 1st-always dic, | ||
| 183 : | ['] 2nd-opc! dic, | ||
| 184 : | ['] Noop dic, | ||
| 185 : | ['] I-Flush dic, | ||
| 186 : | opc, ; | ||
| 187 : | |||
| 188 : | : Opc( | ||
| 189 : | \ Opcode with Operands | ||
| 190 : | Table-Link linked | ||
| 191 : | (Opc() ; | ||
| 192 : | |||
| 193 : | : Opc | ||
| 194 : | \ Opcode without Operands | ||
| 195 : | Table-Link linked | ||
| 196 : | (Opc) ; | ||
| 197 : | |||
| 198 : | : Opc+ | ||
| 199 : | \ Additional Opcode | ||
| 200 : | Table-Link linked | ||
| 201 : | ['] 1st-thru dic, | ||
| 202 : | ['] 2nd-opc! dic, | ||
| 203 : | ['] Noop dic, | ||
| 204 : | ['] Noop dic, | ||
| 205 : | opc, ; | ||
| 206 : | |||
| 207 : | : Opc(+ | ||
| 208 : | \ Additional Opcode with Operands | ||
| 209 : | Table-Link linked | ||
| 210 : | ['] 1st-thru dic, | ||
| 211 : | ['] 2nd-opc! dic, | ||
| 212 : | dic, | ||
| 213 : | ['] Noop dic, | ||
| 214 : | opc, ; | ||
| 215 : | |||
| 216 : | : End-Table ; | ||
| 217 : | |||
| 218 : | : alone | ||
| 219 : | Create 0 dic, ( Dummy Linkfield ) (opc) | ||
| 220 : | DOES> dup cell+ perform 0= ABORT" must work always!" ; | ||
| 221 : | |||
| 222 : | : alone( | ||
| 223 : | Create 0 dic, ( Dummy Linkfield ) (opc() | ||
| 224 : | DOES> dup cell+ perform 0= ABORT" must work always!" ; |
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