| 1 | /* srcdest.c --- decoding M32C addressing modes. |
| 2 | |
| 3 | Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc. |
| 4 | Contributed by Red Hat, Inc. |
| 5 | |
| 6 | This file is part of the GNU simulators. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | |
| 25 | #include "cpu.h" |
| 26 | #include "mem.h" |
| 27 | |
| 28 | static int src_indirect = 0; |
| 29 | static int dest_indirect = 0; |
| 30 | static int src_addend = 0; |
| 31 | static int dest_addend = 0; |
| 32 | |
| 33 | static int |
| 34 | disp8 () |
| 35 | { |
| 36 | int rv; |
| 37 | int tsave = trace; |
| 38 | |
| 39 | if (trace == 1) |
| 40 | trace = 0; |
| 41 | rv = mem_get_qi (get_reg (pc)); |
| 42 | regs.r_pc++; |
| 43 | trace = tsave; |
| 44 | return rv; |
| 45 | } |
| 46 | |
| 47 | static int |
| 48 | disp16 () |
| 49 | { |
| 50 | int rv; |
| 51 | int tsave = trace; |
| 52 | |
| 53 | if (trace == 1) |
| 54 | trace = 0; |
| 55 | rv = mem_get_hi (get_reg (pc)); |
| 56 | regs.r_pc += 2; |
| 57 | trace = tsave; |
| 58 | return rv; |
| 59 | } |
| 60 | |
| 61 | static int |
| 62 | disp24 () |
| 63 | { |
| 64 | int rv; |
| 65 | int tsave = trace; |
| 66 | |
| 67 | if (trace == 1) |
| 68 | trace = 0; |
| 69 | rv = mem_get_psi (get_reg (pc)); |
| 70 | regs.r_pc += 3; |
| 71 | trace = tsave; |
| 72 | return rv; |
| 73 | } |
| 74 | |
| 75 | static int |
| 76 | disp20 () |
| 77 | { |
| 78 | return disp24 () & 0x000fffff; |
| 79 | } |
| 80 | |
| 81 | const char * |
| 82 | bits (int v, int b) |
| 83 | { |
| 84 | static char buf[17]; |
| 85 | char *bp = buf + 16; |
| 86 | *bp = 0; |
| 87 | while (b) |
| 88 | { |
| 89 | *--bp = (v & 1) ? '1' : '0'; |
| 90 | v >>= 1; |
| 91 | b--; |
| 92 | } |
| 93 | return bp; |
| 94 | } |
| 95 | |
| 96 | static const char *the_bits = 0; |
| 97 | |
| 98 | void |
| 99 | decode_indirect (int si, int di) |
| 100 | { |
| 101 | src_indirect = si; |
| 102 | dest_indirect = di; |
| 103 | if (trace && (si || di)) |
| 104 | printf ("indirect: s:%d d:%d\n", si, di); |
| 105 | } |
| 106 | |
| 107 | void |
| 108 | decode_index (int sa, int da) |
| 109 | { |
| 110 | src_addend = sa; |
| 111 | dest_addend = da; |
| 112 | if (trace && (sa || da)) |
| 113 | printf ("index: s:%d d:%d\n", sa, da); |
| 114 | } |
| 115 | |
| 116 | srcdest |
| 117 | decode_srcdest4 (int destcode, int bw) |
| 118 | { |
| 119 | srcdest sd; |
| 120 | sd.bytes = bw ? 2 : 1; |
| 121 | sd.mem = (destcode >= 6) ? 1 : 0; |
| 122 | static const char *dc_wnames[16] = { "r0", "r1", "r2", "r3", |
| 123 | "a0", "a1", "[a0]", "[a1]", |
| 124 | "disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]", |
| 125 | "disp16[a0]", "disp16[a1]", "disp16[sb]", "disp16" |
| 126 | }; |
| 127 | static const char *dc_bnames[4] = { "r0l", "r0h", "r1l", "r1h" };; |
| 128 | |
| 129 | if (trace) |
| 130 | { |
| 131 | const char *n = dc_wnames[destcode]; |
| 132 | if (bw == 0 && destcode <= 3) |
| 133 | n = dc_bnames[destcode]; |
| 134 | if (!the_bits) |
| 135 | the_bits = bits (destcode, 4); |
| 136 | printf ("decode: %s (%d) : %s\n", the_bits, destcode, n); |
| 137 | the_bits = 0; |
| 138 | } |
| 139 | |
| 140 | switch (destcode) |
| 141 | { |
| 142 | case 0x0: |
| 143 | sd.u.reg = bw ? r0 : r0l; |
| 144 | break; |
| 145 | case 0x1: |
| 146 | sd.u.reg = bw ? r1 : r0h; |
| 147 | break; |
| 148 | case 0x2: |
| 149 | sd.u.reg = bw ? r2 : r1l; |
| 150 | break; |
| 151 | case 0x3: |
| 152 | sd.u.reg = bw ? r3 : r1h; |
| 153 | break; |
| 154 | case 0x4: |
| 155 | sd.u.reg = a0; |
| 156 | break; |
| 157 | case 0x5: |
| 158 | sd.u.reg = a1; |
| 159 | break; |
| 160 | case 0x6: |
| 161 | sd.u.addr = get_reg (a0); |
| 162 | break; |
| 163 | case 0x7: |
| 164 | sd.u.addr = get_reg (a1); |
| 165 | break; |
| 166 | case 0x8: |
| 167 | sd.u.addr = get_reg (a0) + disp8 (); |
| 168 | break; |
| 169 | case 0x9: |
| 170 | sd.u.addr = get_reg (a1) + disp8 (); |
| 171 | break; |
| 172 | case 0xa: |
| 173 | sd.u.addr = get_reg (sb) + disp8 (); |
| 174 | break; |
| 175 | case 0xb: |
| 176 | sd.u.addr = get_reg (fb) + sign_ext (disp8 (), 8); |
| 177 | break; |
| 178 | case 0xc: |
| 179 | sd.u.addr = get_reg (a0) + disp16 (); |
| 180 | break; |
| 181 | case 0xd: |
| 182 | sd.u.addr = get_reg (a1) + disp16 (); |
| 183 | break; |
| 184 | case 0xe: |
| 185 | sd.u.addr = get_reg (sb) + disp16 (); |
| 186 | break; |
| 187 | case 0xf: |
| 188 | sd.u.addr = disp16 (); |
| 189 | break; |
| 190 | default: |
| 191 | abort (); |
| 192 | } |
| 193 | if (sd.mem) |
| 194 | sd.u.addr &= addr_mask; |
| 195 | return sd; |
| 196 | } |
| 197 | |
| 198 | srcdest |
| 199 | decode_jumpdest (int destcode, int w) |
| 200 | { |
| 201 | srcdest sd; |
| 202 | sd.bytes = w ? 2 : 3; |
| 203 | sd.mem = (destcode >= 6) ? 1 : 0; |
| 204 | static const char *dc_wnames[16] = { "r0", "r1", "r2", "r3", |
| 205 | "a0", "a1", "[a0]", "[a1]", |
| 206 | "disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]", |
| 207 | "disp20[a0]", "disp20[a1]", "disp16[sb]", "abs16" |
| 208 | }; |
| 209 | static const char *dc_anames[4] = { "r0l", "r0h", "r1l", "r1h" }; |
| 210 | |
| 211 | if (trace) |
| 212 | { |
| 213 | const char *n = dc_wnames[destcode]; |
| 214 | if (w == 0 && destcode <= 3) |
| 215 | n = dc_anames[destcode]; |
| 216 | if (!the_bits) |
| 217 | the_bits = bits (destcode, 4); |
| 218 | printf ("decode: %s : %s\n", the_bits, n); |
| 219 | the_bits = 0; |
| 220 | } |
| 221 | |
| 222 | switch (destcode) |
| 223 | { |
| 224 | case 0x0: |
| 225 | sd.u.reg = w ? r0 : r2r0; |
| 226 | break; |
| 227 | case 0x1: |
| 228 | sd.u.reg = w ? r1 : r2r0; |
| 229 | break; |
| 230 | case 0x2: |
| 231 | sd.u.reg = w ? r2 : r3r1; |
| 232 | break; |
| 233 | case 0x3: |
| 234 | sd.u.reg = w ? r3 : r3r1; |
| 235 | break; |
| 236 | case 0x4: |
| 237 | sd.u.reg = w ? a0 : a1a0; |
| 238 | break; |
| 239 | case 0x5: |
| 240 | sd.u.reg = w ? a1 : a1a0; |
| 241 | break; |
| 242 | case 0x6: |
| 243 | sd.u.addr = get_reg (a0); |
| 244 | break; |
| 245 | case 0x7: |
| 246 | sd.u.addr = get_reg (a1); |
| 247 | break; |
| 248 | case 0x8: |
| 249 | sd.u.addr = get_reg (a0) + disp8 (); |
| 250 | break; |
| 251 | case 0x9: |
| 252 | sd.u.addr = get_reg (a1) + disp8 (); |
| 253 | break; |
| 254 | case 0xa: |
| 255 | sd.u.addr = get_reg (sb) + disp8 (); |
| 256 | break; |
| 257 | case 0xb: |
| 258 | sd.u.addr = get_reg (fb) + sign_ext (disp8 (), 8); |
| 259 | break; |
| 260 | case 0xc: |
| 261 | sd.u.addr = get_reg (a0) + disp20 (); |
| 262 | break; |
| 263 | case 0xd: |
| 264 | sd.u.addr = get_reg (a1) + disp20 (); |
| 265 | break; |
| 266 | case 0xe: |
| 267 | sd.u.addr = get_reg (sb) + disp16 (); |
| 268 | break; |
| 269 | case 0xf: |
| 270 | sd.u.addr = disp16 (); |
| 271 | break; |
| 272 | default: |
| 273 | abort (); |
| 274 | } |
| 275 | if (sd.mem) |
| 276 | sd.u.addr &= addr_mask; |
| 277 | return sd; |
| 278 | } |
| 279 | |
| 280 | srcdest |
| 281 | decode_dest3 (int destcode, int bw) |
| 282 | { |
| 283 | static char map[8] = { -1, -1, -1, 1, 0, 10, 11, 15 }; |
| 284 | |
| 285 | the_bits = bits (destcode, 3); |
| 286 | return decode_srcdest4 (map[destcode], bw); |
| 287 | } |
| 288 | |
| 289 | srcdest |
| 290 | decode_src2 (int srccode, int bw, int d) |
| 291 | { |
| 292 | static char map[4] = { 0, 10, 11, 15 }; |
| 293 | |
| 294 | the_bits = bits (srccode, 2); |
| 295 | return decode_srcdest4 (srccode ? map[srccode] : 1 - d, bw); |
| 296 | } |
| 297 | |
| 298 | static struct |
| 299 | { |
| 300 | reg_id b_regno; |
| 301 | reg_id w_regno; |
| 302 | int is_memory; |
| 303 | int disp_bytes; |
| 304 | char *name; |
| 305 | } modes23[] = |
| 306 | { |
| 307 | { |
| 308 | a0, a0, 1, 0, "[A0]"}, /* 0 0 0 0 0 */ |
| 309 | { |
| 310 | a1, a1, 1, 0, "[A1]"}, /* 0 0 0 0 1 */ |
| 311 | { |
| 312 | a0, a0, 0, 0, "A0"}, /* 0 0 0 1 0 */ |
| 313 | { |
| 314 | a1, a1, 0, 0, "A1"}, /* 0 0 0 1 1 */ |
| 315 | { |
| 316 | a0, a0, 1, 1, "dsp:8[A0]"}, /* 0 0 1 0 0 */ |
| 317 | { |
| 318 | a1, a1, 1, 1, "dsp:8[A1]"}, /* 0 0 1 0 1 */ |
| 319 | { |
| 320 | sb, sb, 1, 1, "dsp:8[SB]"}, /* 0 0 1 1 0 */ |
| 321 | { |
| 322 | fb, fb, 1, -1, "dsp:8[FB]"}, /* 0 0 1 1 1 */ |
| 323 | { |
| 324 | a0, a0, 1, 2, "dsp:16[A0]"}, /* 0 1 0 0 0 */ |
| 325 | { |
| 326 | a1, a1, 1, 2, "dsp:16[A1]"}, /* 0 1 0 0 1 */ |
| 327 | { |
| 328 | sb, sb, 1, 2, "dsp:16[SB]"}, /* 0 1 0 1 0 */ |
| 329 | { |
| 330 | fb, fb, 1, -2, "dsp:16[FB]"}, /* 0 1 0 1 1 */ |
| 331 | { |
| 332 | a0, a0, 1, 3, "dsp:24[A0]"}, /* 0 1 1 0 0 */ |
| 333 | { |
| 334 | a1, a1, 1, 3, "dsp:24[A1]"}, /* 0 1 1 0 1 */ |
| 335 | { |
| 336 | mem, mem, 1, 3, "abs24"}, /* 0 1 1 1 0 */ |
| 337 | { |
| 338 | mem, mem, 1, 2, "abs16"}, /* 0 1 1 1 1 */ |
| 339 | { |
| 340 | r0h, r2, 0, 0, "R0H/R2"}, /* 1 0 0 0 0 */ |
| 341 | { |
| 342 | r1h, r3, 0, 0, "R1H/R3"}, /* 1 0 0 0 1 */ |
| 343 | { |
| 344 | r0l, r0, 0, 0, "R0L/R0"}, /* 1 0 0 1 0 */ |
| 345 | { |
| 346 | r1l, r1, 0, 0, "R1L/R1"}, /* 1 0 0 1 1 */ |
| 347 | }; |
| 348 | |
| 349 | static srcdest |
| 350 | decode_sd23 (int bbb, int bb, int bytes, int ind, int add) |
| 351 | { |
| 352 | srcdest sd; |
| 353 | int code = (bbb << 2) | bb; |
| 354 | |
| 355 | if (code >= sizeof (modes23) / sizeof (modes23[0])) |
| 356 | abort (); |
| 357 | |
| 358 | if (trace) |
| 359 | { |
| 360 | char *b1 = ""; |
| 361 | char *b2 = ""; |
| 362 | char ad[30]; |
| 363 | if (ind) |
| 364 | { |
| 365 | b1 = "["; |
| 366 | b2 = "]"; |
| 367 | } |
| 368 | if (add) |
| 369 | sprintf (ad, "%+d", add); |
| 370 | else |
| 371 | ad[0] = 0; |
| 372 | if (!the_bits) |
| 373 | the_bits = bits (code, 4); |
| 374 | printf ("decode: %s (%d) : %s%s%s%s\n", the_bits, code, b1, |
| 375 | modes23[code].name, ad, b2); |
| 376 | the_bits = 0; |
| 377 | } |
| 378 | |
| 379 | sd.bytes = bytes; |
| 380 | sd.mem = modes23[code].is_memory; |
| 381 | if (sd.mem) |
| 382 | { |
| 383 | if (modes23[code].w_regno == mem) |
| 384 | sd.u.addr = 0; |
| 385 | else |
| 386 | sd.u.addr = get_reg (modes23[code].w_regno); |
| 387 | switch (modes23[code].disp_bytes) |
| 388 | { |
| 389 | case 1: |
| 390 | sd.u.addr += disp8 (); |
| 391 | break; |
| 392 | case 2: |
| 393 | sd.u.addr += disp16 (); |
| 394 | break; |
| 395 | case -1: |
| 396 | sd.u.addr += sign_ext (disp8 (), 8); |
| 397 | break; |
| 398 | case -2: |
| 399 | sd.u.addr += sign_ext (disp16 (), 16); |
| 400 | break; |
| 401 | case 3: |
| 402 | sd.u.addr += disp24 (); |
| 403 | break; |
| 404 | default: |
| 405 | break; |
| 406 | } |
| 407 | if (add) |
| 408 | sd.u.addr += add; |
| 409 | if (ind) |
| 410 | sd.u.addr = mem_get_si (sd.u.addr & membus_mask); |
| 411 | sd.u.addr &= membus_mask; |
| 412 | } |
| 413 | else |
| 414 | { |
| 415 | sd.u.reg = (bytes > 1) ? modes23[code].w_regno : modes23[code].b_regno; |
| 416 | if (bytes == 3 || bytes == 4) |
| 417 | { |
| 418 | switch (sd.u.reg) |
| 419 | { |
| 420 | case r0: |
| 421 | sd.u.reg = r2r0; |
| 422 | break; |
| 423 | case r1: |
| 424 | sd.u.reg = r3r1; |
| 425 | break; |
| 426 | case r2: |
| 427 | abort (); |
| 428 | case r3: |
| 429 | abort (); |
| 430 | default:; |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | } |
| 435 | return sd; |
| 436 | } |
| 437 | |
| 438 | srcdest |
| 439 | decode_dest23 (int ddd, int dd, int bytes) |
| 440 | { |
| 441 | return decode_sd23 (ddd, dd, bytes, dest_indirect, dest_addend); |
| 442 | } |
| 443 | |
| 444 | srcdest |
| 445 | decode_src23 (int sss, int ss, int bytes) |
| 446 | { |
| 447 | return decode_sd23 (sss, ss, bytes, src_indirect, src_addend); |
| 448 | } |
| 449 | |
| 450 | srcdest |
| 451 | decode_dest2 (int dd, int bytes) |
| 452 | { |
| 453 | /* r0l/r0, abs16, dsp:8[SB], dsp:8[FB] */ |
| 454 | static char map[4] = { 0x12, 0x0f, 0x06, 0x07 }; |
| 455 | |
| 456 | the_bits = bits (dd, 2); |
| 457 | return decode_sd23 (map[dd] >> 2, map[dd] & 3, bytes, dest_indirect, |
| 458 | dest_addend); |
| 459 | } |
| 460 | |
| 461 | srcdest |
| 462 | decode_src3 (int sss, int bytes) |
| 463 | { |
| 464 | /* r0, r1, a0, a1, r2, r3, N/A, N/A */ |
| 465 | static char map[8] = { 0x12, 0x13, 0x02, 0x03, 0x10, 0x11, 0, 0 }; |
| 466 | |
| 467 | the_bits = bits (sss, 3); |
| 468 | return decode_sd23 (map[sss] >> 2, map[sss] & 3, bytes, src_indirect, |
| 469 | src_addend); |
| 470 | } |
| 471 | |
| 472 | srcdest |
| 473 | decode_dest1 (int destcode, int bw) |
| 474 | { |
| 475 | the_bits = bits (destcode, 1); |
| 476 | return decode_srcdest4 (destcode, bw); |
| 477 | } |
| 478 | |
| 479 | srcdest |
| 480 | decode_cr (int crcode) |
| 481 | { |
| 482 | static int regcode[] = { 0, intbl, intbh, flags, isp, sp, sb, fb }; |
| 483 | srcdest sd; |
| 484 | sd.mem = 0; |
| 485 | sd.bytes = 2; |
| 486 | sd.u.reg = regcode[crcode & 7]; |
| 487 | return sd; |
| 488 | } |
| 489 | |
| 490 | srcdest |
| 491 | decode_cr_b (int crcode, int bank) |
| 492 | { |
| 493 | /* FIXME: intbl, intbh, isp */ |
| 494 | static int regcode[3][8] = { |
| 495 | {0, 0, flags, 0, 0, 0, 0, 0}, |
| 496 | {intb, sp, sb, fb, 0, 0, 0, isp}, |
| 497 | {0, 0, 0, 0, 0, 0, 0, 0} |
| 498 | }; |
| 499 | srcdest sd; |
| 500 | sd.mem = 0; |
| 501 | sd.bytes = bank ? 3 : 2; |
| 502 | sd.u.reg = regcode[bank][crcode & 7]; |
| 503 | return sd; |
| 504 | } |
| 505 | |
| 506 | srcdest |
| 507 | widen_sd (srcdest sd) |
| 508 | { |
| 509 | sd.bytes *= 2; |
| 510 | if (!sd.mem) |
| 511 | switch (sd.u.reg) |
| 512 | { |
| 513 | case r0l: |
| 514 | sd.u.reg = r0; |
| 515 | break; |
| 516 | case r0: |
| 517 | sd.u.reg = r2r0; |
| 518 | break; |
| 519 | case r1l: |
| 520 | sd.u.reg = r1; |
| 521 | break; |
| 522 | case r1: |
| 523 | sd.u.reg = r3r1; |
| 524 | break; |
| 525 | case a0: |
| 526 | if (A16) |
| 527 | sd.u.reg = a1a0; |
| 528 | break; |
| 529 | default: |
| 530 | break; |
| 531 | } |
| 532 | return sd; |
| 533 | } |
| 534 | |
| 535 | srcdest |
| 536 | reg_sd (reg_id reg) |
| 537 | { |
| 538 | srcdest rv; |
| 539 | rv.bytes = reg_bytes[reg]; |
| 540 | rv.mem = 0; |
| 541 | rv.u.reg = reg; |
| 542 | return rv; |
| 543 | } |
| 544 | |
| 545 | int |
| 546 | get_src (srcdest sd) |
| 547 | { |
| 548 | int v; |
| 549 | if (sd.mem) |
| 550 | { |
| 551 | switch (sd.bytes) |
| 552 | { |
| 553 | case 1: |
| 554 | v = mem_get_qi (sd.u.addr); |
| 555 | break; |
| 556 | case 2: |
| 557 | v = mem_get_hi (sd.u.addr); |
| 558 | break; |
| 559 | case 3: |
| 560 | v = mem_get_psi (sd.u.addr); |
| 561 | break; |
| 562 | case 4: |
| 563 | v = mem_get_si (sd.u.addr); |
| 564 | break; |
| 565 | default: |
| 566 | abort (); |
| 567 | } |
| 568 | } |
| 569 | else |
| 570 | { |
| 571 | v = get_reg (sd.u.reg); |
| 572 | switch (sd.bytes) |
| 573 | { |
| 574 | case 1: |
| 575 | v &= 0xff; |
| 576 | break; |
| 577 | case 2: |
| 578 | v &= 0xffff; |
| 579 | break; |
| 580 | case 3: |
| 581 | v &= 0xffffff; |
| 582 | break; |
| 583 | } |
| 584 | } |
| 585 | return v; |
| 586 | } |
| 587 | |
| 588 | void |
| 589 | put_dest (srcdest sd, int v) |
| 590 | { |
| 591 | if (sd.mem) |
| 592 | { |
| 593 | switch (sd.bytes) |
| 594 | { |
| 595 | case 1: |
| 596 | mem_put_qi (sd.u.addr, v); |
| 597 | break; |
| 598 | case 2: |
| 599 | mem_put_hi (sd.u.addr, v); |
| 600 | break; |
| 601 | case 3: |
| 602 | mem_put_psi (sd.u.addr, v); |
| 603 | break; |
| 604 | case 4: |
| 605 | mem_put_si (sd.u.addr, v); |
| 606 | break; |
| 607 | } |
| 608 | } |
| 609 | else |
| 610 | { |
| 611 | switch (sd.bytes) |
| 612 | { |
| 613 | case 1: |
| 614 | v &= 0xff; |
| 615 | break; |
| 616 | case 2: |
| 617 | v &= 0xffff; |
| 618 | break; |
| 619 | case 3: |
| 620 | v &= 0xffffff; |
| 621 | break; |
| 622 | } |
| 623 | put_reg (sd.u.reg, v); |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | srcdest |
| 628 | decode_bit (int destcode) |
| 629 | { |
| 630 | srcdest sd; |
| 631 | int addr = 0; |
| 632 | static const char *dc_names[] = { "r0", "r1", "r2", "r3", |
| 633 | "a0", "a1", "[a0]", "[a1]", |
| 634 | "disp8[a0]", "disp8[a1]", "disp8[sb]", "disp8[fb]", |
| 635 | "disp16[a0]", "disp16[a1]", "disp16[sb]", "abs16" |
| 636 | }; |
| 637 | |
| 638 | if (trace) |
| 639 | { |
| 640 | const char *the_bits = bits (destcode, 4); |
| 641 | printf ("decode: %s : %s\n", the_bits, dc_names[destcode]); |
| 642 | } |
| 643 | |
| 644 | switch (destcode) |
| 645 | { |
| 646 | case 0: |
| 647 | sd.u.reg = r0; |
| 648 | break; |
| 649 | case 1: |
| 650 | sd.u.reg = r1; |
| 651 | break; |
| 652 | case 2: |
| 653 | sd.u.reg = r2; |
| 654 | break; |
| 655 | case 3: |
| 656 | sd.u.reg = r3; |
| 657 | break; |
| 658 | case 4: |
| 659 | sd.u.reg = a0; |
| 660 | break; |
| 661 | case 5: |
| 662 | sd.u.reg = a1; |
| 663 | break; |
| 664 | case 6: |
| 665 | addr = get_reg (a0); |
| 666 | break; |
| 667 | case 7: |
| 668 | addr = get_reg (a1); |
| 669 | break; |
| 670 | case 8: |
| 671 | addr = get_reg (a0) + disp8 (); |
| 672 | break; |
| 673 | case 9: |
| 674 | addr = get_reg (a1) + disp8 (); |
| 675 | break; |
| 676 | case 10: |
| 677 | addr = get_reg (sb) * 8 + disp8 (); |
| 678 | break; |
| 679 | case 11: |
| 680 | addr = get_reg (fb) * 8 + sign_ext (disp8 (), 8); |
| 681 | break; |
| 682 | case 12: |
| 683 | addr = get_reg (a0) + disp16 (); |
| 684 | break; |
| 685 | case 13: |
| 686 | addr = get_reg (a1) + disp16 (); |
| 687 | break; |
| 688 | case 14: |
| 689 | addr = get_reg (sb) + disp16 (); |
| 690 | break; |
| 691 | case 15: |
| 692 | addr = disp16 (); |
| 693 | break; |
| 694 | } |
| 695 | |
| 696 | if (destcode < 6) |
| 697 | { |
| 698 | int d = disp8 (); |
| 699 | sd.mem = 0; |
| 700 | sd.mask = 1 << (d & 0x0f); |
| 701 | } |
| 702 | else |
| 703 | { |
| 704 | addr &= addr_mask; |
| 705 | sd.mem = 1; |
| 706 | sd.mask = 1 << (addr & 7); |
| 707 | sd.u.addr = addr >> 3; |
| 708 | } |
| 709 | return sd; |
| 710 | } |
| 711 | |
| 712 | srcdest |
| 713 | decode_bit11 (int op0) |
| 714 | { |
| 715 | srcdest sd; |
| 716 | sd.mask = 1 << (op0 & 7); |
| 717 | sd.mem = 1; |
| 718 | sd.u.addr = get_reg (sb) + disp8 (); |
| 719 | return sd; |
| 720 | } |
| 721 | |
| 722 | int |
| 723 | get_bit (srcdest sd) |
| 724 | { |
| 725 | int b; |
| 726 | if (sd.mem) |
| 727 | b = mem_get_qi (sd.u.addr) & sd.mask; |
| 728 | else |
| 729 | b = get_reg (sd.u.reg) & sd.mask; |
| 730 | return b ? 1 : 0; |
| 731 | } |
| 732 | |
| 733 | void |
| 734 | put_bit (srcdest sd, int val) |
| 735 | { |
| 736 | int b; |
| 737 | if (sd.mem) |
| 738 | b = mem_get_qi (sd.u.addr); |
| 739 | else |
| 740 | b = get_reg (sd.u.reg); |
| 741 | if (val) |
| 742 | b |= sd.mask; |
| 743 | else |
| 744 | b &= ~sd.mask; |
| 745 | if (sd.mem) |
| 746 | mem_put_qi (sd.u.addr, b); |
| 747 | else |
| 748 | put_reg (sd.u.reg, b); |
| 749 | } |
| 750 | |
| 751 | int |
| 752 | get_bit2 (srcdest sd, int bit) |
| 753 | { |
| 754 | int b; |
| 755 | if (sd.mem) |
| 756 | b = mem_get_qi (sd.u.addr + (bit >> 3)) & (1 << (bit & 7)); |
| 757 | else |
| 758 | b = get_reg (sd.u.reg) & (1 << bit); |
| 759 | return b ? 1 : 0; |
| 760 | } |
| 761 | |
| 762 | void |
| 763 | put_bit2 (srcdest sd, int bit, int val) |
| 764 | { |
| 765 | int b; |
| 766 | if (sd.mem) |
| 767 | b = mem_get_qi (sd.u.addr + (bit >> 3)); |
| 768 | else |
| 769 | b = get_reg (sd.u.reg); |
| 770 | if (val) |
| 771 | b |= (1 << (bit & 7)); |
| 772 | else |
| 773 | b &= ~(1 << (bit & 7)); |
| 774 | if (sd.mem) |
| 775 | mem_put_qi (sd.u.addr + (bit >> 3), b); |
| 776 | else |
| 777 | put_reg (sd.u.reg, b); |
| 778 | } |