Mercurial > hg-old > index.cgi
annotate src/insn_misc.c @ 7:7e50d576470d 1.0 1.0 1.1
Added build system files
| author | lost |
|---|---|
| date | Sat, 04 Oct 2008 03:26:25 +0000 |
| parents | 34568fab6058 |
| children | f736579569b4 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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34568fab6058
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2 insn_misc.c |
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3 Copyright © 2008 William Astle |
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4 |
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5 This file is part of LWASM. |
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6 |
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7 LWASM is free software: you can redistribute it and/or modify it under the |
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34568fab6058
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8 terms of the GNU General Public License as published by the Free Software |
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9 Foundation, either version 3 of the License, or (at your option) any later |
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34568fab6058
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10 version. |
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11 |
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12 This program is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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34568fab6058
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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34568fab6058
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15 more details. |
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16 |
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17 You should have received a copy of the GNU General Public License along with |
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18 this program. If not, see <http://www.gnu.org/licenses/>. |
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19 |
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20 Contains code for parsing miscelaneous addressing modes |
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21 */ |
| 0 | 22 |
| 23 #include <ctype.h> | |
| 24 #include <stdio.h> | |
| 25 #include <string.h> | |
| 26 #include "lwasm.h" | |
| 27 #include "instab.h" | |
| 28 | |
| 29 extern void insn_gen_aux(asmstate_t *as, sourceline_t *cl, char **optr, int *b1, int *b2, int *b3, int *op); | |
| 30 | |
| 31 void insn_inh(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 32 { | |
| 33 cl -> addrmode = OPER_INH; | |
| 34 emitop(instab[cl -> opcode].ops[0]); | |
| 35 } | |
| 36 | |
| 37 void insn_rtor(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 38 { | |
| 39 int r0, r1; | |
| 40 static const char *regs = "D X Y U S PCW V A B CCDP0 0 E F "; | |
| 41 | |
| 42 cl -> addrmode = OPER_RTOR; | |
| 43 emitop(instab[cl -> opcode].ops[0]); | |
| 44 // register to register (r0,r1) | |
| 45 // registers are in order: | |
| 46 // D,X,Y,U,S,PC,W,V | |
| 47 // A,B,CC,DP,0,0,E,F | |
| 48 r0 = lookupreg(regs, optr); | |
| 49 if (r0 < 0 || *(*optr)++ != ',') | |
| 50 { | |
| 51 errorp1(ERR_BADOPER); | |
| 52 r0 = r1 = 0; | |
| 53 } | |
| 54 else | |
| 55 { | |
| 56 r1 = lookupreg(regs, optr); | |
| 57 if (r1 < 0) | |
| 58 { | |
| 59 errorp1(ERR_BADOPER); | |
| 60 r0=r1=0; | |
| 61 } | |
| 62 } | |
| 63 emit((r0 << 4) | r1); | |
| 64 } | |
| 65 | |
| 66 void insn_rlist(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 67 { | |
| 68 int rb = 0; | |
| 69 int rn; | |
| 70 static const char *regs = "CCA B DPX Y U PCD S "; | |
| 71 | |
| 72 emitop(instab[cl -> opcode].ops[0]); | |
| 73 cl -> addrmode = OPER_RLIST; | |
| 74 while (**optr && !isspace(**optr)) | |
| 75 { | |
| 76 rn = lookupreg(regs, optr); | |
| 77 if (rn < 0) | |
| 78 { | |
| 79 printf("Bad reg (%s)\n", *optr); | |
| 80 errorp1(ERR_BADOPER); | |
| 81 emit(0); | |
| 82 return; | |
| 83 } | |
| 84 if (**optr && **optr != ',' && !isspace(**optr)) | |
| 85 { | |
| 86 printf("Bad char (%c)\n", **optr); | |
| 87 errorp1(ERR_BADOPER); | |
| 88 emit(0); | |
| 89 return; | |
| 90 } | |
| 91 if (**optr == ',') | |
| 92 (*optr)++; | |
| 93 if (rn == 8) | |
| 94 rn = 6; | |
| 95 else if (rn == 9) | |
| 96 rn = 0x40; | |
| 97 else | |
| 98 rn = 1 << rn; | |
| 99 rb |= rn; | |
| 100 } | |
| 101 emit(rb); | |
| 102 } | |
| 103 | |
| 104 // for aim, oim, eim, tim | |
| 105 void insn_logicmem(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 106 { | |
| 107 int rval, v1; | |
| 108 int b1, b2, b3, op; | |
| 109 | |
| 110 if (**optr == '#') | |
| 111 (*optr)++; | |
| 112 | |
| 113 rval = eval_expr(as, cl, optr, &v1); | |
| 114 if (rval < 0) | |
| 115 return; | |
| 116 | |
| 117 if (v1 < -128 || v1 > 255) | |
| 118 { | |
| 119 errorp2(ERR_OVERFLOW); | |
| 120 v1 = 0; | |
| 121 } | |
| 122 | |
| 123 if (**optr != ',' && **optr != ';') | |
| 124 { | |
| 125 errorp1(ERR_BADOPER); | |
| 126 return; | |
| 127 } | |
| 128 | |
| 129 (*optr)++; | |
| 130 | |
| 131 // now we have a general addressing mode - call for it | |
| 132 insn_gen_aux(as, cl, optr, &b1, &b2, &b3, &op); | |
| 133 | |
| 134 emitop(op); | |
| 135 emit(v1 & 0xff); | |
| 136 if (b1 != -1) | |
| 137 { | |
| 138 emit(b1); | |
| 139 } | |
| 140 if (b2 != -1) | |
| 141 { | |
| 142 emit(b2); | |
| 143 } | |
| 144 if (b3 != -1) | |
| 145 { | |
| 146 emit(b3); | |
| 147 } | |
| 148 } | |
| 149 | |
| 150 void insn_tfm(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 151 { | |
| 152 static const char *reglist = "DXYUS AB 00EF"; | |
| 153 int r0, r1; | |
| 154 char *c; | |
| 155 int tfm = 0; | |
| 156 | |
| 157 cl -> addrmode = OPER_TFM; | |
| 158 | |
| 159 c = strchr(reglist, toupper(*(*optr)++)); | |
| 160 if (!c) | |
| 161 { | |
| 162 errorp1(ERR_BADOPER); | |
| 163 return; | |
| 164 } | |
| 165 r0 = c - reglist; | |
| 166 if (**optr == '+') | |
| 167 { | |
| 168 (*optr)++; | |
| 169 tfm = 1; | |
| 170 } | |
| 171 else if (**optr == '-') | |
| 172 { | |
| 173 (*optr)++; | |
| 174 tfm = 2; | |
| 175 } | |
| 176 if (*(*optr)++ != ',') | |
| 177 { | |
| 178 errorp1(ERR_BADOPER); | |
| 179 return; | |
| 180 } | |
| 181 c = strchr(reglist, toupper(*(*optr)++)); | |
| 182 if (!c) | |
| 183 { | |
| 184 errorp1(ERR_BADOPER); | |
| 185 return; | |
| 186 } | |
| 187 r1 = c - reglist; | |
| 188 | |
| 189 if (**optr == '+') | |
| 190 { | |
| 191 (*optr)++; | |
| 192 tfm |= 4; | |
| 193 } | |
| 194 else if (**optr == '-') | |
| 195 { | |
| 196 (*optr)++; | |
| 197 tfm |= 8; | |
| 198 } | |
| 199 | |
| 200 if (**optr && !isspace(**optr)) | |
| 201 { | |
| 202 errorp1(ERR_BADOPER); | |
| 203 return; | |
| 204 } | |
| 205 | |
| 206 // valid values of tfm here are: | |
| 207 // 1: r0+,r1 (2) | |
| 208 // 4: r0,r1+ (3) | |
| 209 // 5: r0+,r1+ (0) | |
| 210 // 10: r0-,r1- (1) | |
| 211 switch (tfm) | |
| 212 { | |
| 213 case 5: //r0+,r1+ | |
| 214 emitop(instab[cl -> opcode].ops[0]); | |
| 215 break; | |
| 216 case 10: //r0-,r1- | |
| 217 emitop(instab[cl -> opcode].ops[1]); | |
| 218 break; | |
| 219 case 1: // r0+,r1 | |
| 220 emitop(instab[cl -> opcode].ops[2]); | |
| 221 break; | |
| 222 case 4: // r0,r1+ | |
| 223 emitop(instab[cl -> opcode].ops[3]); | |
| 224 break; | |
| 225 default: | |
| 226 errorp1(ERR_BADOPER); | |
| 227 return; | |
| 228 } | |
| 229 emit((r0 << 4) | r1); | |
| 230 } | |
| 231 | |
| 232 void insn_bitbit(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 233 { | |
| 234 int r; | |
| 235 int rval; | |
| 236 int v1; | |
| 237 int tv; | |
| 238 | |
| 239 emitop(instab[cl -> opcode].ops[0]); | |
| 240 | |
| 241 cl -> addrmode = OPER_BITBIT; | |
| 242 | |
| 243 r = toupper(*(*optr)++); | |
| 244 if (r == 'A') | |
| 245 r = 1; | |
| 246 else if (r == 'B') | |
| 247 r = 2; | |
| 248 else if (r == 'C' && toupper(**optr) == 'C') | |
| 249 { | |
| 250 r = 0; | |
| 251 (*optr)++; | |
| 252 } | |
| 253 else | |
| 254 { | |
| 255 errorp1(ERR_BADREG); | |
| 256 return; | |
| 257 } | |
| 258 if (*(*optr)++ != ',') | |
| 259 { | |
| 260 errorp1(ERR_BADOPER); | |
| 261 return; | |
| 262 } | |
| 263 rval = eval_expr(as, cl, optr, &v1); | |
| 264 if (v1 < 0 || v1 > 7) | |
| 265 { | |
| 266 errorp2(ERR_OVERFLOW3); | |
| 267 v1 = 0; | |
| 268 } | |
| 269 if (*(*optr)++ != ',') | |
| 270 { | |
| 271 errorp1(ERR_BADOPER); | |
| 272 return; | |
| 273 } | |
| 274 r = (r << 6) | (v1 << 3); | |
| 275 rval = eval_expr(as, cl, optr, &v1); | |
| 276 if (v1 < 0 || v1 > 7) | |
| 277 { | |
| 278 errorp2(ERR_OVERFLOW3); | |
| 279 v1 = 0; | |
| 280 } | |
| 281 if (*(*optr)++ != ',') | |
| 282 { | |
| 283 errorp1(ERR_BADOPER); | |
| 284 return; | |
| 285 } | |
| 286 r |= v1; | |
| 287 | |
| 288 emit(r); | |
| 289 | |
| 290 // ignore base page address modifier | |
| 291 if (**optr == '<') | |
| 292 optr++; | |
| 293 | |
| 294 rval = eval_expr(as, cl, optr, &v1); | |
| 295 v1 &= 0xFFFF; | |
| 296 tv = v1 - ((cl -> dpval) << 8); | |
| 297 if (tv > 0xFF || tv < 0) | |
| 298 errorp2(ERR_OVERFLOW); | |
| 299 emit(tv & 0xff); | |
| 300 } | |
| 301 | |
| 302 void insn_rel8(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 303 { | |
| 304 int v1, rval; | |
| 305 | |
| 306 emitop(instab[cl -> opcode].ops[0]); | |
| 307 cl -> addrmode = OPER_REL8; | |
| 308 rval = eval_expr(as, cl, optr, &v1); | |
| 309 v1 &= 0xFFFF; | |
| 310 v1 -= cl -> addr + 2; | |
| 311 if (v1 < -128 || v1 > 127) | |
| 312 errorp2(ERR_OVERFLOW); | |
| 313 v1 &= 0xFFFF; | |
| 314 emit(v1 & 0xff); | |
| 315 } | |
| 316 | |
| 317 void insn_rel16(asmstate_t *as, sourceline_t *cl, char **optr) | |
| 318 { | |
| 319 int v1, rval; | |
| 320 | |
| 321 emitop(instab[cl -> opcode].ops[0]); | |
| 322 cl -> addrmode = OPER_REL16; | |
| 323 rval = eval_expr(as, cl, optr, &v1); | |
| 324 v1 &= 0xFFFF; | |
| 325 v1 -= cl -> addr + 3; | |
| 326 if (instab[cl -> opcode].ops[0] > 0xff) | |
| 327 v1 -= 1; | |
| 328 v1 &= 0xFFFF; | |
| 329 emit(v1 >> 8); | |
| 330 emit(v1 & 0xff); | |
| 331 } |