1 /* Print Z80 and R800 instructions 2 Copyright 2005, 2007 Free Software Foundation, Inc. 3 Contributed by Arnold Metselaar <arnold_m@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 58 fetch_data (struct buffer *buf, disassemble_info * info, int n) 59 { 60 int r; 61 62 if (buf->n_fetch + n > 4) 63 abort (); 64 65 r = info->read_memory_func (buf->base + buf->n_fetch, 66 (unsigned char*) buf->data + buf->n_fetch, 67 n, info); 68 if (r == 0) 69 buf->n_fetch += n; 70 return !r; 71 } 72 73 static int 74 prt (struct buffer *buf, disassemble_info * info, char *txt) 75 { 76 info->fprintf_func (info->stream, "%s", txt); 77 buf->n_used = buf->n_fetch; 78 return 1; 79 } 80 81 static int 82 prt_e (struct buffer *buf, disassemble_info * info, char *txt) 83 { 84 char e; 85 int target_addr; 86 87 if (fetch_data (buf, info, 1)) 88 { 89 e = buf->data[1]; 90 target_addr = (buf->base + 2 + e) & 0xffff; 91 buf->n_used = buf->n_fetch; 92 info->fprintf_func (info->stream, "%s0x%04x", txt, target_addr); 93 } 94 else 95 buf->n_used = -1; 96 97 return buf->n_used; 98 } 99 100 static int 101 jr_cc (struct buffer *buf, disassemble_info * info, char *txt) 102 { 103 char mytxt[TXTSIZ]; 104 105 snprintf (mytxt, TXTSIZ, txt, cc_str[(buf->data[0] >> 3) & 3]); 106 return prt_e (buf, info, mytxt); 107 } 108 109 static int 110 prt_nn (struct buffer *buf, disassemble_info * info, char *txt) 111 { 112 int nn; 113 unsigned char *p; 114 115 p = (unsigned char*) buf->data + buf->n_fetch; 116 if (fetch_data (buf, info, 2)) 117 { 118 nn = p[0] + (p[1] << 8); 119 info->fprintf_func (info->stream, txt, nn); 120 buf->n_used = buf->n_fetch; 121 } 122 else 123 buf->n_used = -1; 124 return buf->n_used; 125 } 126 127 static int 128 prt_rr_nn (struct buffer *buf, disassemble_info * info, char *txt) 129 { 130 char mytxt[TXTSIZ]; 131 132 snprintf (mytxt, TXTSIZ, txt, rr_str[(buf->data[0] >> 4) & 3]); 133 return prt_nn (buf, info, mytxt); 134 } 135 136 static int 137 prt_rr (struct buffer *buf, disassemble_info * info, char *txt) 138 { 139 info->fprintf_func (info->stream, "%s%s", txt, 140 rr_str[(buf->data[buf->n_fetch - 1] >> 4) & 3]); 141 buf->n_used = buf->n_fetch; 142 return buf->n_used; 143 } 144 145 static int 146 prt_n (struct buffer *buf, disassemble_info * info, char *txt) 147 { 148 int n; 149 unsigned char *p; 150 151 p = (unsigned char*) buf->data + buf->n_fetch; 152 153 if (fetch_data (buf, info, 1)) 154 { 155 n = p[0]; 156 info->fprintf_func (info->stream, txt, n); 157 buf->n_used = buf->n_fetch; 158 } 159 else 160 buf->n_used = -1; 161 162 return buf->n_used; 163 } 164 165 static int 166 ld_r_n (struct buffer *buf, disassemble_info * info, char *txt) 167 { 168 char mytxt[TXTSIZ]; 169 170 snprintf (mytxt, TXTSIZ, txt, r_str[(buf->data[0] >> 3) & 7]); 171 return prt_n (buf, info, mytxt); 172 } 173 174 static int 175 prt_r (struct buffer *buf, disassemble_info * info, char *txt) 176 { 177 info->fprintf_func (info->stream, txt, 178 r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7]); 179 buf->n_used = buf->n_fetch; 180 return buf->n_used; 181 } 182 183 static int 184 ld_r_r (struct buffer *buf, disassemble_info * info, char *txt) 185 { 186 info->fprintf_func (info->stream, txt, 187 r_str[(buf->data[buf->n_fetch - 1] >> 3) & 7], 188 r_str[buf->data[buf->n_fetch - 1] & 7]); 189 buf->n_used = buf->n_fetch; 190 return buf->n_used; 191 } 192 193 static int 194 arit_r (struct buffer *buf, disassemble_info * info, char *txt) 195 { 196 info->fprintf_func (info->stream, txt, 197 arit_str[(buf->data[buf->n_fetch - 1] >> 3) & 7], 198 r_str[buf->data[buf->n_fetch - 1] & 7]); 199 buf->n_used = buf->n_fetch; 200 return buf->n_used; 201 } 202 203 static int 204 prt_cc (struct buffer *buf, disassemble_info * info, char *txt) 205 { 206 info->fprintf_func (info->stream, "%s%s", txt, 207 cc_str[(buf->data[0] >> 3) & 7]); 208 buf->n_used = buf->n_fetch; 209 return buf->n_used; 210 } 211 212 static int 213 pop_rr (struct buffer *buf, disassemble_info * info, char *txt) 214 { 215 static char *rr_stack[] = { "bc","de","hl","af"}; 216 217 info->fprintf_func (info->stream, "%s %s", txt, 218 rr_stack[(buf->data[0] >> 4) & 3]); 219 buf->n_used = buf->n_fetch; 220 return buf->n_used; 221 } 222 223 224 static int 225 jp_cc_nn (struct buffer *buf, disassemble_info * info, char *txt) 226 { 227 char mytxt[TXTSIZ]; 228 229 snprintf (mytxt,TXTSIZ, 230 "%s%s,0x%%04x", txt, cc_str[(buf->data[0] >> 3) & 7]); 231 return prt_nn (buf, info, mytxt); 232 } 233 234 static int 235 arit_n (struct buffer *buf, disassemble_info * info, char *txt) 236 { 237 char mytxt[TXTSIZ]; 238 239 snprintf (mytxt,TXTSIZ, txt, arit_str[(buf->data[0] >> 3) & 7]); 240 return prt_n (buf, info, mytxt); 241 } 242 243 static int 244 rst (struct buffer *buf, disassemble_info * info, char *txt) 245 { 246 info->fprintf_func (info->stream, txt, buf->data[0] & 0x38); 247 buf->n_used = buf->n_fetch; 248 return buf->n_used; 249 } 250 251 252 static int 253 cis (struct buffer *buf, disassemble_info * info, char *txt ATTRIBUTE_UNUSED) 254 { 255 static char * opar[] = { "ld", "cp", "in", "out" }; 256 char * op; 257 char c; 258 259 c = buf->data[1]; 260 op = ((0x13 & c) == 0x13) ? "ot" : (opar[c & 3]); 261 info->fprintf_func (info->stream, 262 "%s%c%s", op, 263 (c & 0x08) ? 'd' : 'i', 264 (c & 0x10) ? "r" : ""); 265 buf->n_used = 2; 266 return buf->n_used; 267 } 268 269 static int 270 dump (struct buffer *buf, disassemble_info * info, char *txt) 271 { 272 int i; 273 274 info->fprintf_func (info->stream, "defb "); 275 for (i = 0; txt[i]; ++i) 276 info->fprintf_func (info->stream, i ? ", 0x%02x" : "0x%02x", 277 (unsigned char) buf->data[i]); 278 buf->n_used = i; 279 return buf->n_used; 280 } 281 282 /* Table to disassemble machine codes with prefix 0xED. */ 283 struct tab_elt opc_ed[] = 284 { 285 { 0x70, 0xFF, prt, "in f,(c)" }, 286 { 0x70, 0xFF, dump, "xx" }, 287 { 0x40, 0xC7, prt_r, "in %s,(c)" }, 288 { 0x71, 0xFF, prt, "out (c),0" }, 289 { 0x70, 0xFF, dump, "xx" }, 290 { 0x41, 0xC7, prt_r, "out (c),%s" }, 291 { 0x42, 0xCF, prt_rr, "sbc hl," }, 292 { 0x43, 0xCF, prt_rr_nn, "ld (0x%%04x),%s" }, 293 { 0x44, 0xFF, prt, "neg" }, 294 { 0x45, 0xFF, prt, "retn" }, 295 { 0x46, 0xFF, prt, "im 0" }, 296 { 0x47, 0xFF, prt, "ld i,a" }, 297 { 0x4A, 0xCF, prt_rr, "adc hl," }, 298 { 0x4B, 0xCF, prt_rr_nn, "ld %s,(0x%%04x)" }, 299 { 0x4D, 0xFF, prt, "reti" }, 300 { 0x56, 0xFF, prt, "im 1" }, 301 { 0x57, 0xFF, prt, "ld a,i" }, 302 { 0x5E, 0xFF, prt, "im 2" }, 303 { 0x67, 0xFF, prt, "rrd" }, 304 { 0x6F, 0xFF, prt, "rld" }, 305 { 0xA0, 0xE4, cis, "" }, 306 { 0xC3, 0xFF, prt, "muluw hl,bc" }, 307 { 0xC5, 0xE7, prt_r, "mulub a,%s" }, 308 { 0xF3, 0xFF, prt, "muluw hl,sp" }, 309 { 0x00, 0x00, dump, "xx" } 310 }; 311 312 static int 313 pref_ed (struct buffer * buf, disassemble_info * info, 314 char* txt ATTRIBUTE_UNUSED) 315 { 316 struct tab_elt *p; 317 318 if (fetch_data(buf, info, 1)) 319 { 320 for (p = opc_ed; p->val != (buf->data[1] & p->mask); ++p) 321 ; 322 p->fp (buf, info, p->text); 323 } 324 else 325 buf->n_used = -1; 326 327 return buf->n_used; 328 } 329 330 /* Instruction names for the instructions addressing single bits. */ 331 static char *cb1_str[] = { "", "bit", "res", "set"}; 332 /* Instruction names for shifts and rotates. */ 333 static char *cb2_str[] = 334 { 335 "rlc", "rrc", "rl", "rr", "sla", "sra", "sli", "srl" 336 }; 337 338 static int 339 pref_cb (struct buffer * buf, disassemble_info * info, 340 char* txt ATTRIBUTE_UNUSED) 341 { 342 if (fetch_data (buf, info, 1)) 343 { 344 buf->n_used = 2; 345 if ((buf->data[1] & 0xc0) == 0) 346 info->fprintf_func (info->stream, "%s %s", 347 cb2_str[(buf->data[1] >> 3) & 7], 348 r_str[buf->data[1] & 7]); 349 else 350 info->fprintf_func (info->stream, "%s %d,%s", 351 cb1_str[(buf->data[1] >> 6) & 3], 352 (buf->data[1] >> 3) & 7, 353 r_str[buf->data[1] & 7]); 354 } 355 else 356 buf->n_used = -1; 357 358 return buf->n_used; 359 } 360 361 static int 362 addvv (struct buffer * buf, disassemble_info * info, char* txt) 363 { 364 info->fprintf_func (info->stream, "add %s,%s", txt, txt); 365 366 return buf->n_used = buf->n_fetch; 367 } 368 369 static int 370 ld_v_v (struct buffer * buf, disassemble_info * info, char* txt) 371 { 372 char mytxt[TXTSIZ]; 373 374 snprintf (mytxt, TXTSIZ, "ld %s%%s,%s%%s", txt, txt); 375 return ld_r_r (buf, info, mytxt); 376 } 377 378 static int 379 prt_d (struct buffer *buf, disassemble_info * info, char *txt) 380 { 381 int d; 382 signed char *p; 383 384 p = buf->data + buf->n_fetch; 385 386 if (fetch_data (buf, info, 1)) 387 { 388 d = p[0]; 389 info->fprintf_func (info->stream, txt, d); 390 buf->n_used = buf->n_fetch; 391 } 392 else 393 buf->n_used = -1; 394 395 return buf->n_used; 396 } 397 398 static int 399 prt_d_n (struct buffer *buf, disassemble_info * info, char *txt) 400 { 401 char mytxt[TXTSIZ]; 402 int d; 403 signed char *p; 404 405 p = buf->data + buf->n_fetch; 406 407 if (fetch_data (buf, info, 1)) 408 { 409 d = p[0]; 410 snprintf (mytxt, TXTSIZ, txt, d); 411 return prt_n (buf, info, mytxt); 412 } 413 else 414 buf->n_used = -1; 415 416 return buf->n_used; 417 } 418 419 static int 420 arit_d (struct buffer *buf, disassemble_info * info, char *txt) 421 { 422 char mytxt[TXTSIZ]; 423 signed char c; 424 425 c = buf->data[buf->n_fetch - 1]; 426 snprintf (mytxt, TXTSIZ, txt, arit_str[(c >> 3) & 7]); 427 return prt_d (buf, info, mytxt); 428 } 429 430 static int 431 ld_r_d (struct buffer *buf, disassemble_info * info, char *txt) 432 { 433 char mytxt[TXTSIZ]; 434 signed char c; 435 436 c = buf->data[buf->n_fetch - 1]; 437 snprintf (mytxt, TXTSIZ, txt, r_str[(c >> 3) & 7]); 438 return prt_d (buf, info, mytxt); 439 } 440 441 static int 442 ld_d_r(struct buffer *buf, disassemble_info * info, char *txt) 443 { 444 char mytxt[TXTSIZ]; 445 signed char c; 446 447 c = buf->data[buf->n_fetch - 1]; 448 snprintf (mytxt, TXTSIZ, txt, r_str[c & 7]); 449 return prt_d (buf, info, mytxt); 450 } 451 452 static int 453 pref_xd_cb (struct buffer * buf, disassemble_info * info, char* txt) 454 { 455 if (fetch_data (buf, info, 2)) 456 { 457 int d; 458 char arg[TXTSIZ]; 459 signed char *p; 460 461 buf->n_used = 4; 462 p = buf->data; 463 d = p[2]; 464 465 if (((p[3] & 0xC0) == 0x40) || ((p[3] & 7) == 0x06)) 466 snprintf (arg, TXTSIZ, "(%s%+d)", txt, d); 467 else 468 snprintf (arg, TXTSIZ, "(%s%+d),%s", txt, d, r_str[p[3] & 7]); 469 470 if ((p[3] & 0xc0) == 0) 471 info->fprintf_func (info->stream, "%s %s", 472 cb2_str[(buf->data[3] >> 3) & 7], 473 arg); 474 else 475 info->fprintf_func (info->stream, "%s %d,%s", 476 cb1_str[(buf->data[3] >> 6) & 3], 477 (buf->data[3] >> 3) & 7, 478 arg); 479 } 480 else 481 buf->n_used = -1; 482 483 return buf->n_used; 484 } 485 486 /* Table to disassemble machine codes with prefix 0xDD or 0xFD. */ 487 static struct tab_elt opc_ind[] = 488 { 489 { 0x24, 0xF7, prt_r, "inc %s%%s" }, 490 { 0x25, 0xF7, prt_r, "dec %s%%s" }, 491 { 0x26, 0xF7, ld_r_n, "ld %s%%s,0x%%%%02x" }, 492 { 0x21, 0xFF, prt_nn, "ld %s,0x%%04x" }, 493 { 0x22, 0xFF, prt_nn, "ld (0x%%04x),%s" }, 494 { 0x2A, 0xFF, prt_nn, "ld %s,(0x%%04x)" }, 495 { 0x23, 0xFF, prt, "inc %s" }, 496 { 0x2B, 0xFF, prt, "dec %s" }, 497 { 0x29, 0xFF, addvv, "%s" }, 498 { 0x09, 0xCF, prt_rr, "add %s," }, 499 { 0x34, 0xFF, prt_d, "inc (%s%%+d)" }, 500 { 0x35, 0xFF, prt_d, "dec (%s%%+d)" }, 501 { 0x36, 0xFF, prt_d_n, "ld (%s%%+d),0x%%%%02x" }, 502 503 { 0x76, 0xFF, dump, "h" }, 504 { 0x46, 0xC7, ld_r_d, "ld %%s,(%s%%%%+d)" }, 505 { 0x70, 0xF8, ld_d_r, "ld (%s%%%%+d),%%s" }, 506 { 0x64, 0xF6, ld_v_v, "%s" }, 507 { 0x60, 0xF0, ld_r_r, "ld %s%%s,%%s" }, 508 { 0x44, 0xC6, ld_r_r, "ld %%s,%s%%s" }, 509 510 { 0x86, 0xC7, arit_d, "%%s(%s%%%%+d)" }, 511 { 0x84, 0xC6, arit_r, "%%s%s%%s" }, 512 513 { 0xE1, 0xFF, prt, "pop %s" }, 514 { 0xE5, 0xFF, prt, "push %s" }, 515 { 0xCB, 0xFF, pref_xd_cb, "%s" }, 516 { 0xE3, 0xFF, prt, "ex (sp),%s" }, 517 { 0xE9, 0xFF, prt, "jp (%s)" }, 518 { 0xF9, 0xFF, prt, "ld sp,%s" }, 519 { 0x00, 0x00, dump, "?" }, 520 } ; 521 522 static int 523 pref_ind (struct buffer * buf, disassemble_info * info, char* txt) 524 { 525 if (fetch_data (buf, info, 1)) 526 { 527 char mytxt[TXTSIZ]; 528 struct tab_elt *p; 529 530 for (p = opc_ind; p->val != (buf->data[1] & p->mask); ++p) 531 ; 532 snprintf (mytxt, TXTSIZ, p->text, txt); 533 p->fp (buf, info, mytxt); 534 } 535 else 536 buf->n_used = -1; 537 538 return buf->n_used; 539 } 540 541 /* Table to disassemble machine codes without prefix. */ 542 static struct tab_elt opc_main[] = 543 { 544 { 0x00, 0xFF, prt, "nop" }, 545 { 0x01, 0xCF, prt_rr_nn, "ld %s,0x%%04x" }, 546 { 0x02, 0xFF, prt, "ld (bc),a" }, 547 { 0x03, 0xCF, prt_rr, "inc " }, 548 { 0x04, 0xC7, prt_r, "inc %s" }, 549 { 0x05, 0xC7, prt_r, "dec %s" }, 550 { 0x06, 0xC7, ld_r_n, "ld %s,0x%%02x" }, 551 { 0x07, 0xFF, prt, "rlca" }, 552 { 0x08, 0xFF, prt, "ex af,af'" }, 553 { 0x09, 0xCF, prt_rr, "add hl," }, 554 { 0x0A, 0xFF, prt, "ld a,(bc)" }, 555 { 0x0B, 0xCF, prt_rr, "dec " }, 556 { 0x0F, 0xFF, prt, "rrca" }, 557 { 0x10, 0xFF, prt_e, "djnz " }, 558 { 0x12, 0xFF, prt, "ld (de),a" }, 559 { 0x17, 0xFF, prt, "rla" }, 560 { 0x18, 0xFF, prt_e, "jr "}, 561 { 0x1A, 0xFF, prt, "ld a,(de)" }, 562 { 0x1F, 0xFF, prt, "rra" }, 563 { 0x20, 0xE7, jr_cc, "jr %s,"}, 564 { 0x22, 0xFF, prt_nn, "ld (0x%04x),hl" }, 565 { 0x27, 0xFF, prt, "daa"}, 566 { 0x2A, 0xFF, prt_nn, "ld hl,(0x%04x)" }, 567 { 0x2F, 0xFF, prt, "cpl" }, 568 { 0x32, 0xFF, prt_nn, "ld (0x%04x),a" }, 569 { 0x37, 0xFF, prt, "scf" }, 570 { 0x3A, 0xFF, prt_nn, "ld a,(0x%04x)" }, 571 { 0x3F, 0xFF, prt, "ccf" }, 572 573 { 0x76, 0xFF, prt, "halt" }, 574 { 0x40, 0xC0, ld_r_r, "ld %s,%s"}, 575 576 { 0x80, 0xC0, arit_r, "%s%s" }, 577 578 { 0xC0, 0xC7, prt_cc, "ret " }, 579 { 0xC1, 0xCF, pop_rr, "pop" }, 580 { 0xC2, 0xC7, jp_cc_nn, "jp " }, 581 { 0xC3, 0xFF, prt_nn, "jp 0x%04x" }, 582 { 0xC4, 0xC7, jp_cc_nn, "call " }, 583 { 0xC5, 0xCF, pop_rr, "push" }, 584 { 0xC6, 0xC7, arit_n, "%s0x%%02x" }, 585 { 0xC7, 0xC7, rst, "rst 0x%02x" }, 586 { 0xC9, 0xFF, prt, "ret" }, 587 { 0xCB, 0xFF, pref_cb, "" }, 588 { 0xCD, 0xFF, prt_nn, "call 0x%04x" }, 589 { 0xD3, 0xFF, prt_n, "out (0x%02x),a" }, 590 { 0xD9, 0xFF, prt, "exx" }, 591 { 0xDB, 0xFF, prt_n, "in a,(0x%02x)" }, 592 { 0xDD, 0xFF, pref_ind, "ix" }, 593 { 0xE3, 0xFF, prt, "ex (sp),hl" }, 594 { 0xE9, 0xFF, prt, "jp (hl)" }, 595 { 0xEB, 0xFF, prt, "ex de,hl" }, 596 { 0xED, 0xFF, pref_ed, ""}, 597 { 0xF3, 0xFF, prt, "di" }, 598 { 0xF9, 0xFF, prt, "ld sp,hl" }, 599 { 0xFB, 0xFF, prt, "ei" }, 600 { 0xFD, 0xFF, pref_ind, "iy" }, 601 { 0x00, 0x00, prt, "????" }, 602 } ; 603 604 int 605 print_insn_z80 (bfd_vma addr, disassemble_info * info) 606 { 607 struct buffer buf; 608 struct tab_elt *p; 609 610 buf.base = addr; 611 buf.n_fetch = 0; 612 buf.n_used = 0; 613 614 if (! fetch_data (& buf, info, 1)) 615 return -1; 616 617 for (p = opc_main; p->val != (buf.data[0] & p->mask); ++p) 618 ; 619 p->fp (& buf, info, p->text); 620 621 return buf.n_used; 622 } 623