1 /* Print Z80 and R800 instructions 2 Copyright (C) 2005-2016 Free Software Foundation, Inc. 3 Contributed by Arnold Metselaar <arnold_m (at) operamail.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 program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 20 MA 02110-1301, USA. */ 21 22 #include "sysdep.h" 23 #include "dis-asm.h" 24 #include <stdio.h> 25 26 struct buffer 27 { 28 bfd_vma base; 29 int n_fetch; 30 int n_used; 31 signed char data[4]; 32 } ; 33 34 typedef int (*func)(struct buffer *, disassemble_info *, char *); 35 36 struct tab_elt 37 { 38 unsigned char val; 39 unsigned char mask; 40 func fp; 41 char * text; 42 } ; 43 44 #define TXTSIZ 24 45 /* Names of 16-bit registers. */ 46 static char * rr_str[] = { "bc", "de", "hl", "sp" }; 47 /* Names of 8-bit registers. */ 48 static char * r_str[] = { "b", "c", "d", "e", "h", "l", "(hl)", "a" }; 49 /* Texts for condition codes. */ 50 static char * cc_str[] = { "nz", "z", "nc", "c", "po", "pe", "p", "m" }; 51 /* Instruction names for 8-bit arithmetic, operand "a" is often implicit */ 52 static char * arit_str[] = 53 { 54 "add a,", "adc a,", "sub ", "sbc a,", "and ", "xor ", "or ", "cp " 55 } ; 56 57 static int 59 fetch_data (struct buffer *buf, disassemble_info * info, int n) 60 { 61 int r; 62 63 if (buf->n_fetch + n > 4) 64 abort (); 65 66 r = info->read_memory_func (buf->base + buf->n_fetch, 67 (unsigned char*) buf->data + buf->n_fetch, 68 n, info); 69 if (r == 0) 70 buf->n_fetch += n; 71 return !r; 72 } 73 74 static int 75 prt (struct buffer *buf, disassemble_info * info, char *txt) 76 { 77 info->fprintf_func (info->stream, "%s", txt); 78 buf->n_used = buf->n_fetch; 79 return 1; 80 } 81 82 static int 83 prt_e (struct buffer *buf, disassemble_info * info, char *txt) 84 { 85 char e; 86 int target_addr; 87 88 if (fetch_data (buf, info, 1)) 89 { 90 e = buf->data[1]; 91 target_addr = (buf->base + 2 + e) & 0xffff; 92 buf->n_used = buf->n_fetch; 93 info->fprintf_func (info->stream, "%s0x%04x", txt, target_addr); 94 } 95 else 96 buf->n_used = -1; 97 98 return buf->n_used; 99 } 100 101 static int 102 jr_cc (struct buffer *buf, disassemble_info * info, char *txt) 103 { 104 char mytxt[TXTSIZ]; 105 106 snprintf (mytxt, TXTSIZ, txt, cc_str[(buf->data[0] >> 3) & 3]); 107 return prt_e (buf, info, mytxt); 108 } 109 110 static int 111 prt_nn (struct buffer *buf, disassemble_info * info, char *txt) 112 { 113 int nn; 114 unsigned char *p; 115 116 p = (unsigned char*) buf->data + buf->n_fetch; 117 if (fetch_data (buf, info, 2)) 118 { 119 nn = p[0] + (p[1] << 8); 120 info->fprintf_func (info->stream, txt, nn); 121 buf->n_used = buf->n_fetch; 122 } 123 else 124 buf->n_used = -1; 125 return buf->n_used; 126 } 127 128 static int 129 prt_rr_nn (struct buffer *buf, disassemble_info * info, char *txt) 130 { 131 char mytxt[TXTSIZ]; 132 int rr; 133 134 rr = (buf->data[buf->n_fetch - 1] >> 4) & 3; 135 snprintf (mytxt, TXTSIZ, txt, rr_str[rr]); 136 return prt_nn (buf, info, mytxt); 137 } 138 139 static int 140 prt_rr (struct buffer *buf, disassemble_info * info, char *txt) 141 { 142 info->fprintf_func (info->stream, "%s%s", txt, 143 rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]); 144 buf->n_used = buf->n_fetch; 145 return buf->n_used; 146 } 147 148 static int 149 prt_n (struct buffer *buf, disassemble_info * info, char *txt) 150 { 151 int n; 152 unsigned char *p; 153 154 p = (unsigned char*) buf->data + buf->n_fetch; 155 156 if (fetch_data (buf, info, 1)) 157 { 158 n = p[0]; 159 info->fprintf_func (info->stream, txt, n); 160 buf->n_used = buf->n_fetch; 161 } 162 else 163 buf->n_used = -1; 164 165 return buf->n_used; 166 } 167 168 static int 169 ld_r_n (struct buffer *buf, disassemble_info * info, char *txt) 170 { 171 char mytxt[TXTSIZ]; 172 173 snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]); 174 return prt_n (buf, info, mytxt); 175 } 176 177 static int 178 prt_r (struct buffer *buf, disassemble_info * info, char *txt) 179 { 180 info->fprintf_func (info->stream, txt, 181 r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]); 182 buf->n_used = buf->n_fetch; 183 return buf->n_used; 184 } 185 186 static int 187 ld_r_r (struct buffer *buf, disassemble_info * info, char *txt) 188 { 189 info->fprintf_func (info->stream, txt, 190 r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7], 191 r_str[buf->data[buf->n_fetch - 1] & 7]); 192 buf->n_used = buf->n_fetch; 193 return buf->n_used; 194 } 195 196 static int 197 arit_r (struct buffer *buf, disassemble_info * info, char *txt) 198 { 199 info->fprintf_func (info->stream, txt, 200 arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7], 201 r_str[buf->data[buf->n_fetch - 1] & 7]); 202 buf->n_used = buf->n_fetch; 203 return buf->n_used; 204 } 205 206 static int 207 prt_cc (struct buffer *buf, disassemble_info * info, char *txt) 208 { 209 info->fprintf_func (info->stream, "%s%s", txt, 210 cc_str[(buf->data[0] >> 3) & 7]); 211 buf->n_used = buf->n_fetch; 212 return buf->n_used; 213 } 214 215 static int 216 pop_rr (struct buffer *buf, disassemble_info * info, char *txt) 217 { 218 static char *rr_stack[] = { "bc","de","hl","af"}; 219 220 info->fprintf_func (info->stream, "%s %s", txt, 221 rr_stack[(buf->data[0] >> 4) & 3]); 222 buf->n_used = buf->n_fetch; 223 return buf->n_used; 224 } 225 226 227 static int 228 jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt) 229 { 230 char mytxt[TXTSIZ]; 231 232 snprintf (mytxt,TXTSIZ, 233 "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]); 234 return prt_nn (buf, info, mytxt); 235 } 236 237 static int 238 arit_n (struct buffer *buf, disassemble_info * info, char *txt) 239 { 240 char mytxt[TXTSIZ]; 241 242 snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]); 243 return prt_n (buf, info, mytxt); 244 } 245 246 static int 247 rst (struct buffer *buf, disassemble_info * info, char *txt) 248 { 249 info->fprintf_func (info->stream, txt, buf->data[0] & 0x38); 250 buf->n_used = buf->n_fetch; 251 return buf->n_used; 252 } 253 254 255 static int 257 cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED) 258 { 259 static char * opar[] = { "ld", "cp", "in", "out" }; 260 char * op; 261 char c; 262 263 c = buf->data[1]; 264 op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]); 265 info->fprintf_func (info->stream, 266 "%s%c%s", op, 267 (c & 0x08) ? 'd' : 'i', 268 (c & 0x10) ? "r" : ""); 269 buf->n_used = 2; 270 return buf->n_used; 271 } 272 273 static int 274 dump (struct buffer *buf, disassemble_info * info, char *txt) 275 { 276 int i; 277 278 info->fprintf_func (info->stream, "defb "); 279 for (i = 0; txt[i]; ++i) 280 info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x", 281 (unsigned char) buf->data[i]); 282 buf->n_used = i; 283 return buf->n_used; 284 } 285 286 /* Table to disassemble machine codes with prefix 0xED. */ 288 struct tab_elt opc_ed[] = 289 { 290 { 0x70, 0xFF, prt, "in f,(c)" }, 291 { 0x70, 0xFF, dump, "xx" }, 292 { 0x40, 0xC7, prt_r, "in %s,(c)" }, 293 { 0x71, 0xFF, prt, "out (c),0" }, 294 { 0x70, 0xFF, dump, "xx" }, 295 { 0x41, 0xC7, prt_r, "out (c),%s" }, 296 { 0x42, 0xCF, prt_rr, "sbc hl," }, 297 { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" }, 298 { 0x44, 0xFF, prt, "neg" }, 299 { 0x45, 0xFF, prt, "retn" }, 300 { 0x46, 0xFF, prt, "im 0" }, 301 { 0x47, 0xFF, prt, "ld i,a" }, 302 { 0x4A, 0xCF, prt_rr, "adc hl," }, 303 { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" }, 304 { 0x4D, 0xFF, prt, "reti" }, 305 { 0x4F, 0xFF, prt, "ld r,a" }, 306 { 0x56, 0xFF, prt, "im 1" }, 307 { 0x57, 0xFF, prt, "ld a,i" }, 308 { 0x5E, 0xFF, prt, "im 2" }, 309 { 0x5F, 0xFF, prt, "ld a,r" }, 310 { 0x67, 0xFF, prt, "rrd" }, 311 { 0x6F, 0xFF, prt, "rld" }, 312 { 0xA0, 0xE4, cis, "" }, 313 { 0xC3, 0xFF, prt, "muluw hl,bc" }, 314 { 0xC5, 0xE7, prt_r, "mulub a,%s" }, 315 { 0xF3, 0xFF, prt, "muluw hl,sp" }, 316 { 0x00, 0x00, dump, "xx" } 317 }; 318 319 static int 320 pref_ed (struct buffer * buf, disassemble_info * info, 321 char* txt ATTRIBUTE_UNUSED) 322 { 323 struct tab_elt *p; 324 325 if (fetch_data(buf, info, 1)) 326 { 327 for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p) 328 ; 329 p->fp (buf, info, p->text); 330 } 331 else 332 buf->n_used = -1; 333 334 return buf->n_used; 335 } 336 337 /* Instruction names for the instructions addressing single bits. */ 339 static char *cb1_str[] = { "", "bit", "res", "set"}; 340 /* Instruction names for shifts and rotates. */ 341 static char *cb2_str[] = 342 { 343 "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl" 344 }; 345 346 static int 347 pref_cb (struct buffer * buf, disassemble_info * info, 348 char* txt ATTRIBUTE_UNUSED) 349 { 350 if (fetch_data (buf, info, 1)) 351 { 352 buf->n_used = 2; 353 if ((buf->data[1] & 0xc0) == 0) 354 info->fprintf_func (info->stream, "%s %s", 355 cb2_str[(buf->data[1] >> 3) & 7], 356 r_str[buf->data[1] & 7]); 357 else 358 info->fprintf_func (info->stream, "%s %d,%s", 359 cb1_str[(buf->data[1] >> 6) & 3], 360 (buf->data[1] >> 3) & 7, 361 r_str[buf->data[1] & 7]); 362 } 363 else 364 buf->n_used = -1; 365 366 return buf->n_used; 367 } 368 369 static int 371 addvv (struct buffer * buf, disassemble_info * info, char* txt) 372 { 373 info->fprintf_func (info->stream, "add %s,%s", txt, txt); 374 375 return buf->n_used = buf->n_fetch; 376 } 377 378 static int 379 ld_v_v (struct buffer * buf, disassemble_info * info, char* txt) 380 { 381 char mytxt[TXTSIZ]; 382 383 snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt); 384 return ld_r_r (buf, info, mytxt); 385 } 386 387 static int 388 prt_d (struct buffer *buf, disassemble_info * info, char *txt) 389 { 390 int d; 391 signed char *p; 392 393 p = buf->data + buf->n_fetch; 394 395 if (fetch_data (buf, info, 1)) 396 { 397 d = p[0]; 398 info->fprintf_func (info->stream, txt, d); 399 buf->n_used = buf->n_fetch; 400 } 401 else 402 buf->n_used = -1; 403 404 return buf->n_used; 405 } 406 407 static int 408 prt_d_n (struct buffer *buf, disassemble_info * info, char *txt) 409 { 410 char mytxt[TXTSIZ]; 411 int d; 412 signed char *p; 413 414 p = buf->data + buf->n_fetch; 415 416 if (fetch_data (buf, info, 1)) 417 { 418 d = p[0]; 419 snprintf (mytxt, TXTSIZ, txt, d); 420 return prt_n (buf, info, mytxt); 421 } 422 else 423 buf->n_used = -1; 424 425 return buf->n_used; 426 } 427 428 static int 429 arit_d (struct buffer *buf, disassemble_info * info, char *txt) 430 { 431 char mytxt[TXTSIZ]; 432 signed char c; 433 434 c = buf->data[buf->n_fetch - 1]; 435 snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]); 436 return prt_d (buf, info, mytxt); 437 } 438 439 static int 440 ld_r_d (struct buffer *buf, disassemble_info * info, char *txt) 441 { 442 char mytxt[TXTSIZ]; 443 signed char c; 444 445 c = buf->data[buf->n_fetch - 1]; 446 snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]); 447 return prt_d (buf, info, mytxt); 448 } 449 450 static int 451 ld_d_r(struct buffer *buf, disassemble_info * info, char *txt) 452 { 453 char mytxt[TXTSIZ]; 454 signed char c; 455 456 c = buf->data[buf->n_fetch - 1]; 457 snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]); 458 return prt_d (buf, info, mytxt); 459 } 460 461 static int 462 pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt) 463 { 464 if (fetch_data (buf, info, 2)) 465 { 466 int d; 467 char arg[TXTSIZ]; 468 signed char *p; 469 470 buf->n_used = 4; 471 p = buf->data; 472 d = p[2]; 473 474 if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06)) 475 snprintf (arg, TXTSIZ, "(%s%+d)", txt, d); 476 else 477 snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]); 478 479 if ((p[3] & 0xc0) == 0) 480 info->fprintf_func (info->stream, "%s %s", 481 cb2_str[(buf->data[3] >> 3) & 7], 482 arg); 483 else 484 info->fprintf_func (info->stream, "%s %d,%s", 485 cb1_str[(buf->data[3] >> 6) & 3], 486 (buf->data[3] >> 3) & 7, 487 arg); 488 } 489 else 490 buf->n_used = -1; 491 492 return buf->n_used; 493 } 494 495 /* Table to disassemble machine codes with prefix 0xDD or 0xFD. */ 497 static struct tab_elt opc_ind[] = 498 { 499 { 0x24, 0xF7, prt_r, "inc %s%%s" }, 500 { 0x25, 0xF7, prt_r, "dec %s%%s" }, 501 { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" }, 502 { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" }, 503 { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" }, 504 { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" }, 505 { 0x23, 0xFF, prt, "inc %s" }, 506 { 0x2B, 0xFF, prt, "dec %s" }, 507 { 0x29, 0xFF, addvv, "%s" }, 508 { 0x09, 0xCF, prt_rr, "add %s," }, 509 { 0x34, 0xFF, prt_d, "inc (%s%%+d)" }, 510 { 0x35, 0xFF, prt_d, "dec (%s%%+d)" }, 511 { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" }, 512 513 { 0x76, 0xFF, dump, "h" }, 514 { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" }, 515 { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" }, 516 { 0x64, 0xF6, ld_v_v, "%s" }, 517 { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" }, 518 { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" }, 519 520 { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" }, 521 { 0x84, 0xC6, arit_r, "%%s%s%%s" }, 522 523 { 0xE1, 0xFF, prt, "pop %s" }, 524 { 0xE5, 0xFF, prt, "push %s" }, 525 { 0xCB, 0xFF, pref_xd_cb, "%s" }, 526 { 0xE3, 0xFF, prt, "ex (sp),%s" }, 527 { 0xE9, 0xFF, prt, "jp (%s)" }, 528 { 0xF9, 0xFF, prt, "ld sp,%s" }, 529 { 0x00, 0x00, dump, "?" }, 530 } ; 531 532 static int 533 pref_ind (struct buffer * buf, disassemble_info * info, char* txt) 534 { 535 if (fetch_data (buf, info, 1)) 536 { 537 char mytxt[TXTSIZ]; 538 struct tab_elt *p; 539 540 for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p) 541 ; 542 snprintf (mytxt, TXTSIZ, p->text, txt); 543 p->fp (buf, info, mytxt); 544 } 545 else 546 buf->n_used = -1; 547 548 return buf->n_used; 549 } 550 551 /* Table to disassemble machine codes without prefix. */ 552 static struct tab_elt opc_main[] = 553 { 554 { 0x00, 0xFF, prt, "nop" }, 555 { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" }, 556 { 0x02, 0xFF, prt, "ld (bc),a" }, 557 { 0x03, 0xCF, prt_rr, "inc " }, 558 { 0x04, 0xC7, prt_r, "inc %s" }, 559 { 0x05, 0xC7, prt_r, "dec %s" }, 560 { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" }, 561 { 0x07, 0xFF, prt, "rlca" }, 562 { 0x08, 0xFF, prt, "ex af,af'" }, 563 { 0x09, 0xCF, prt_rr, "add hl," }, 564 { 0x0A, 0xFF, prt, "ld a,(bc)" }, 565 { 0x0B, 0xCF, prt_rr, "dec " }, 566 { 0x0F, 0xFF, prt, "rrca" }, 567 { 0x10, 0xFF, prt_e, "djnz " }, 568 { 0x12, 0xFF, prt, "ld (de),a" }, 569 { 0x17, 0xFF, prt, "rla" }, 570 { 0x18, 0xFF, prt_e, "jr "}, 571 { 0x1A, 0xFF, prt, "ld a,(de)" }, 572 { 0x1F, 0xFF, prt, "rra" }, 573 { 0x20, 0xE7, jr_cc, "jr %s,"}, 574 { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" }, 575 { 0x27, 0xFF, prt, "daa"}, 576 { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" }, 577 { 0x2F, 0xFF, prt, "cpl" }, 578 { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" }, 579 { 0x37, 0xFF, prt, "scf" }, 580 { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" }, 581 { 0x3F, 0xFF, prt, "ccf" }, 582 583 { 0x76, 0xFF, prt, "halt" }, 584 { 0x40, 0xC0, ld_r_r, "ld %s,%s"}, 585 586 { 0x80, 0xC0, arit_r, "%s%s" }, 587 588 { 0xC0, 0xC7, prt_cc, "ret " }, 589 { 0xC1, 0xCF, pop_rr, "pop" }, 590 { 0xC2, 0xC7, jp_cc_nn, "jp " }, 591 { 0xC3, 0xFF, prt_nn, "jp 0x%04x" }, 592 { 0xC4, 0xC7, jp_cc_nn, "call " }, 593 { 0xC5, 0xCF, pop_rr, "push" }, 594 { 0xC6, 0xC7, arit_n, "%s0x%%02x" }, 595 { 0xC7, 0xC7, rst, "rst 0x%02x" }, 596 { 0xC9, 0xFF, prt, "ret" }, 597 { 0xCB, 0xFF, pref_cb, "" }, 598 { 0xCD, 0xFF, prt_nn, "call 0x%04x" }, 599 { 0xD3, 0xFF, prt_n, "out (0x%02x),a" }, 600 { 0xD9, 0xFF, prt, "exx" }, 601 { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" }, 602 { 0xDD, 0xFF, pref_ind, "ix" }, 603 { 0xE3, 0xFF, prt, "ex (sp),hl" }, 604 { 0xE9, 0xFF, prt, "jp (hl)" }, 605 { 0xEB, 0xFF, prt, "ex de,hl" }, 606 { 0xED, 0xFF, pref_ed, ""}, 607 { 0xF3, 0xFF, prt, "di" }, 608 { 0xF9, 0xFF, prt, "ld sp,hl" }, 609 { 0xFB, 0xFF, prt, "ei" }, 610 { 0xFD, 0xFF, pref_ind, "iy" }, 611 { 0x00, 0x00, prt, "????" }, 612 } ; 613 614 int 615 print_insn_z80 (bfd_vma addr, disassemble_info * info) 616 { 617 struct buffer buf; 618 struct tab_elt *p; 619 620 buf.base = addr; 621 buf.n_fetch = 0; 622 buf.n_used = 0; 623 624 if (! fetch_data (& buf, info, 1)) 625 return -1; 626 627 for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p) 628 ; 629 p->fp (& buf, info, p->text); 630 631 return buf.n_used; 632 } 633
