| 1 | /* Disassemble AVR instructions. |
| 2 | Copyright (C) 1999, 2000 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by Denis Chertykov <denisc@overta.ru> |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include "dis-asm.h" |
| 23 | #include "opintl.h" |
| 24 | |
| 25 | typedef unsigned char u8; |
| 26 | typedef unsigned short u16; |
| 27 | typedef unsigned long u32; |
| 28 | |
| 29 | #define IFMASK(a,b) ((opcode & (a)) == (b)) |
| 30 | |
| 31 | static char* SREG_flags = "CZNVSHTI"; |
| 32 | static char* sect94[] = {"COM","NEG","SWAP","INC","NULL","ASR","LSR","ROR", |
| 33 | 0,0,"DEC",0,0,0,0,0}; |
| 34 | static char* sect98[] = {"CBI","SBIC","SBI","SBIS"}; |
| 35 | static char* branchs[] = { |
| 36 | "BRCS","BREQ","BRMI","BRVS", |
| 37 | "BRLT","BRHS","BRTS","BRIE", |
| 38 | "BRCC","BRNE","BRPL","BRVC", |
| 39 | "BRGE","BRHC","BRTC","BRID" |
| 40 | }; |
| 41 | |
| 42 | static char* last4[] = {"BLD","BST","SBRC","SBRS"}; |
| 43 | |
| 44 | |
| 45 | static void dispLDD PARAMS ((u16, char *)); |
| 46 | |
| 47 | static void |
| 48 | dispLDD (opcode, dest) |
| 49 | u16 opcode; |
| 50 | char *dest; |
| 51 | { |
| 52 | opcode = (((opcode & 0x2000) >> 8) | ((opcode & 0x0c00) >> 7) |
| 53 | | (opcode & 7)); |
| 54 | sprintf(dest, "%d", opcode); |
| 55 | } |
| 56 | |
| 57 | |
| 58 | static void regPP PARAMS ((u16, char *)); |
| 59 | |
| 60 | static void |
| 61 | regPP (opcode, dest) |
| 62 | u16 opcode; |
| 63 | char *dest; |
| 64 | { |
| 65 | opcode = ((opcode & 0x0600) >> 5) | (opcode & 0xf); |
| 66 | sprintf(dest, "0x%02X", opcode); |
| 67 | } |
| 68 | |
| 69 | |
| 70 | static void reg50 PARAMS ((u16, char *)); |
| 71 | |
| 72 | static void |
| 73 | reg50 (opcode, dest) |
| 74 | u16 opcode; |
| 75 | char *dest; |
| 76 | { |
| 77 | opcode = (opcode & 0x01f0) >> 4; |
| 78 | sprintf(dest, "R%d", opcode); |
| 79 | } |
| 80 | |
| 81 | |
| 82 | static void reg104 PARAMS ((u16, char *)); |
| 83 | |
| 84 | static void |
| 85 | reg104 (opcode, dest) |
| 86 | u16 opcode; |
| 87 | char *dest; |
| 88 | { |
| 89 | opcode = (opcode & 0xf) | ((opcode & 0x0200) >> 5); |
| 90 | sprintf(dest, "R%d", opcode); |
| 91 | } |
| 92 | |
| 93 | |
| 94 | static void reg40 PARAMS ((u16, char *)); |
| 95 | |
| 96 | static void |
| 97 | reg40 (opcode, dest) |
| 98 | u16 opcode; |
| 99 | char *dest; |
| 100 | { |
| 101 | opcode = (opcode & 0xf0) >> 4; |
| 102 | sprintf(dest, "R%d", opcode + 16); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | static void reg20w PARAMS ((u16, char *)); |
| 107 | |
| 108 | static void |
| 109 | reg20w (opcode, dest) |
| 110 | u16 opcode; |
| 111 | char *dest; |
| 112 | { |
| 113 | opcode = (opcode & 0x30) >> 4; |
| 114 | sprintf(dest, "R%d", 24 + opcode * 2); |
| 115 | } |
| 116 | |
| 117 | |
| 118 | static void lit404 PARAMS ((u16, char *)); |
| 119 | |
| 120 | static void |
| 121 | lit404 (opcode, dest) |
| 122 | u16 opcode; |
| 123 | char *dest; |
| 124 | { |
| 125 | opcode = ((opcode & 0xf00) >> 4) | (opcode & 0xf); |
| 126 | sprintf(dest, "0x%02X", opcode); |
| 127 | } |
| 128 | |
| 129 | |
| 130 | static void lit204 PARAMS ((u16, char *)); |
| 131 | |
| 132 | static void |
| 133 | lit204 (opcode, dest) |
| 134 | u16 opcode; |
| 135 | char *dest; |
| 136 | { |
| 137 | opcode = ((opcode & 0xc0) >> 2) | (opcode & 0xf); |
| 138 | sprintf(dest, "0x%02X", opcode); |
| 139 | } |
| 140 | |
| 141 | |
| 142 | static void add0fff PARAMS ((u16, char *, int)); |
| 143 | |
| 144 | static void |
| 145 | add0fff (op, dest, pc) |
| 146 | u16 op; |
| 147 | char *dest; |
| 148 | int pc; |
| 149 | { |
| 150 | int rel_addr = (((op & 0xfff) ^ 0x800) - 0x800) * 2; |
| 151 | sprintf(dest, ".%+-8d ; 0x%06X", rel_addr, pc + 2 + rel_addr); |
| 152 | } |
| 153 | |
| 154 | |
| 155 | static void add03f8 PARAMS ((u16, char *, int)); |
| 156 | |
| 157 | static void |
| 158 | add03f8 (op, dest, pc) |
| 159 | u16 op; |
| 160 | char *dest; |
| 161 | int pc; |
| 162 | { |
| 163 | int rel_addr = ((((op >> 3) & 0x7f) ^ 0x40) - 0x40) * 2; |
| 164 | sprintf(dest, ".%+-8d ; 0x%06X", rel_addr, pc + 2 + rel_addr); |
| 165 | } |
| 166 | |
| 167 | |
| 168 | static u16 avrdis_opcode PARAMS ((bfd_vma, disassemble_info *)); |
| 169 | |
| 170 | static u16 |
| 171 | avrdis_opcode (addr, info) |
| 172 | bfd_vma addr; |
| 173 | disassemble_info *info; |
| 174 | { |
| 175 | bfd_byte buffer[2]; |
| 176 | int status; |
| 177 | status = info->read_memory_func(addr, buffer, 2, info); |
| 178 | if (status != 0) |
| 179 | { |
| 180 | info->memory_error_func(status, addr, info); |
| 181 | return -1; |
| 182 | } |
| 183 | return bfd_getl16 (buffer); |
| 184 | } |
| 185 | |
| 186 | |
| 187 | int |
| 188 | print_insn_avr(addr, info) |
| 189 | bfd_vma addr; |
| 190 | disassemble_info *info; |
| 191 | { |
| 192 | char rr[200]; |
| 193 | char rd[200]; |
| 194 | u16 opcode; |
| 195 | void *stream = info->stream; |
| 196 | fprintf_ftype prin = info->fprintf_func; |
| 197 | int cmd_len = 2; |
| 198 | |
| 199 | opcode = avrdis_opcode (addr, info); |
| 200 | |
| 201 | if (IFMASK(0xd000, 0x8000)) |
| 202 | { |
| 203 | char letter; |
| 204 | reg50(opcode, rd); |
| 205 | dispLDD(opcode, rr); |
| 206 | if (opcode & 8) |
| 207 | letter = 'Y'; |
| 208 | else |
| 209 | letter = 'Z'; |
| 210 | if (opcode & 0x0200) |
| 211 | (*prin) (stream, " STD %c+%s,%s", letter, rr, rd); |
| 212 | else |
| 213 | (*prin) (stream, " LDD %s,%c+%s", rd, letter, rr); |
| 214 | } |
| 215 | else |
| 216 | { |
| 217 | switch (opcode & 0xf000) |
| 218 | { |
| 219 | case 0x0000: |
| 220 | { |
| 221 | reg50(opcode, rd); |
| 222 | reg104(opcode, rr); |
| 223 | switch (opcode & 0x0c00) |
| 224 | { |
| 225 | case 0x0000: |
| 226 | (*prin) (stream, " NOP"); |
| 227 | break; |
| 228 | case 0x0400: |
| 229 | (*prin) (stream, " CPC %s,%s", rd, rr); |
| 230 | break; |
| 231 | case 0x0800: |
| 232 | (*prin) (stream, " SBC %s,%s", rd, rr); |
| 233 | break; |
| 234 | case 0x0c00: |
| 235 | (*prin) (stream, " ADD %s,%s", rd, rr); |
| 236 | break; |
| 237 | } |
| 238 | } |
| 239 | break; |
| 240 | case 0x1000: |
| 241 | { |
| 242 | reg50(opcode, rd); |
| 243 | reg104(opcode, rr); |
| 244 | switch (opcode & 0x0c00) |
| 245 | { |
| 246 | case 0x0000: |
| 247 | (*prin) (stream, " CPSE %s,%s", rd, rr); |
| 248 | break; |
| 249 | case 0x0400: |
| 250 | (*prin) (stream, " CP %s,%s", rd, rr); |
| 251 | break; |
| 252 | case 0x0800: |
| 253 | (*prin) (stream, " SUB %s,%s", rd, rr); |
| 254 | break; |
| 255 | case 0x0c00: |
| 256 | (*prin) (stream, " ADC %s,%s", rd, rr); |
| 257 | break; |
| 258 | } |
| 259 | } |
| 260 | break; |
| 261 | case 0x2000: |
| 262 | { |
| 263 | reg50(opcode, rd); |
| 264 | reg104(opcode, rr); |
| 265 | switch (opcode & 0x0c00) |
| 266 | { |
| 267 | case 0x0000: |
| 268 | (*prin) (stream, " AND %s,%s", rd, rr); |
| 269 | break; |
| 270 | case 0x0400: |
| 271 | (*prin) (stream, " EOR %s,%s", rd, rr); |
| 272 | break; |
| 273 | case 0x0800: |
| 274 | (*prin) (stream, " OR %s,%s", rd, rr); |
| 275 | break; |
| 276 | case 0x0c00: |
| 277 | (*prin) (stream, " MOV %s,%s", rd, rr); |
| 278 | break; |
| 279 | } |
| 280 | } |
| 281 | break; |
| 282 | case 0x3000: |
| 283 | { |
| 284 | reg40(opcode, rd); |
| 285 | lit404(opcode, rr); |
| 286 | (*prin) (stream, " CPI %s,%s", rd, rr); |
| 287 | } |
| 288 | break; |
| 289 | case 0x4000: |
| 290 | { |
| 291 | reg40(opcode, rd); |
| 292 | lit404(opcode, rr); |
| 293 | (*prin) (stream, " SBCI %s,%s", rd, rr); |
| 294 | } |
| 295 | break; |
| 296 | case 0x5000: |
| 297 | { |
| 298 | reg40(opcode, rd); |
| 299 | lit404(opcode, rr); |
| 300 | (*prin) (stream, " SUBI %s,%s", rd, rr); |
| 301 | } |
| 302 | break; |
| 303 | case 0x6000: |
| 304 | { |
| 305 | reg40(opcode, rd); |
| 306 | lit404(opcode, rr); |
| 307 | (*prin) (stream, " ORI %s,%s", rd, rr); |
| 308 | } |
| 309 | break; |
| 310 | case 0x7000: |
| 311 | { |
| 312 | reg40(opcode, rd); |
| 313 | lit404(opcode, rr); |
| 314 | (*prin) (stream, " ANDI %s,%s", rd, rr); |
| 315 | } |
| 316 | break; |
| 317 | case 0x9000: |
| 318 | { |
| 319 | switch (opcode & 0x0e00) |
| 320 | { |
| 321 | case 0x0000: |
| 322 | { |
| 323 | reg50(opcode, rd); |
| 324 | switch (opcode & 0xf) |
| 325 | { |
| 326 | case 0x0: |
| 327 | { |
| 328 | (*prin) (stream, " LDS %s,0x%04X", rd, |
| 329 | avrdis_opcode(addr + 2, info)); |
| 330 | cmd_len = 4; |
| 331 | } |
| 332 | break; |
| 333 | case 0x1: |
| 334 | (*prin) (stream, " LD %s,Z+", rd); |
| 335 | break; |
| 336 | case 0x2: |
| 337 | (*prin) (stream, " LD %s,-Z", rd); |
| 338 | break; |
| 339 | case 0x9: |
| 340 | (*prin) (stream, " LD %s,Y+", rd); |
| 341 | break; |
| 342 | case 0xa: |
| 343 | (*prin) (stream, " LD %s,-Y", rd); |
| 344 | break; |
| 345 | case 0xc: |
| 346 | (*prin) (stream, " LD %s,X", rd); |
| 347 | break; |
| 348 | case 0xd: |
| 349 | (*prin) (stream, " LD %s,X+", rd); |
| 350 | break; |
| 351 | case 0xe: |
| 352 | (*prin) (stream, " LD %s,-X", rd); |
| 353 | break; |
| 354 | case 0xf: |
| 355 | (*prin) (stream, " POP %s", rd); |
| 356 | break; |
| 357 | default: |
| 358 | (*prin) (stream, " ????"); |
| 359 | break; |
| 360 | } |
| 361 | } |
| 362 | break; |
| 363 | case 0x0200: |
| 364 | { |
| 365 | reg50(opcode, rd); |
| 366 | switch (opcode & 0xf) |
| 367 | { |
| 368 | case 0x0: |
| 369 | { |
| 370 | (*prin) (stream, " STS 0x%04X,%s", |
| 371 | avrdis_opcode(addr + 2, info), rd); |
| 372 | cmd_len = 4; |
| 373 | } |
| 374 | break; |
| 375 | case 0x1: |
| 376 | (*prin) (stream, " ST Z+,%s", rd); |
| 377 | break; |
| 378 | case 0x2: |
| 379 | (*prin) (stream, " ST -Z,%s", rd); |
| 380 | break; |
| 381 | case 0x9: |
| 382 | (*prin) (stream, " ST Y+,%s", rd); |
| 383 | break; |
| 384 | case 0xa: |
| 385 | (*prin) (stream, " ST -Y,%s", rd); |
| 386 | break; |
| 387 | case 0xc: |
| 388 | (*prin) (stream, " ST X,%s", rd); |
| 389 | break; |
| 390 | case 0xd: |
| 391 | (*prin) (stream, " ST X+,%s", rd); |
| 392 | break; |
| 393 | case 0xe: |
| 394 | (*prin) (stream, " ST -X,%s", rd); |
| 395 | break; |
| 396 | case 0xf: |
| 397 | (*prin) (stream, " PUSH %s", rd); |
| 398 | break; |
| 399 | default: |
| 400 | (*prin) (stream, " ????"); |
| 401 | break; |
| 402 | } |
| 403 | } |
| 404 | break; |
| 405 | case 0x0400: |
| 406 | { |
| 407 | if (IFMASK(0x020c, 0x000c)) |
| 408 | { |
| 409 | u32 k = ((opcode & 0x01f0) >> 3) | (opcode & 1); |
| 410 | k = (k << 16) | avrdis_opcode(addr + 2, info); |
| 411 | if (opcode & 0x0002) |
| 412 | (*prin) (stream, " CALL 0x%06X", k*2); |
| 413 | else |
| 414 | (*prin) (stream, " JMP 0x%06X", k*2); |
| 415 | cmd_len = 4; |
| 416 | } |
| 417 | else if (IFMASK(0x010f, 0x0008)) |
| 418 | { |
| 419 | int sf = (opcode & 0x70) >> 4; |
| 420 | if (opcode & 0x0080) |
| 421 | (*prin) (stream, " CL%c", SREG_flags[sf]); |
| 422 | else |
| 423 | (*prin) (stream, " SE%c", SREG_flags[sf]); |
| 424 | } |
| 425 | else if (IFMASK(0x000f, 0x0009)) |
| 426 | { |
| 427 | if (opcode & 0x0100) |
| 428 | (*prin) (stream, " ICALL"); |
| 429 | else |
| 430 | (*prin) (stream, " IJMP"); |
| 431 | } |
| 432 | else if (IFMASK(0x010f, 0x0108)) |
| 433 | { |
| 434 | if (IFMASK(0x0090, 0x0000)) |
| 435 | (*prin) (stream, " RET"); |
| 436 | else if (IFMASK(0x0090, 0x0010)) |
| 437 | (*prin) (stream, " RETI"); |
| 438 | else if (IFMASK(0x00e0, 0x0080)) |
| 439 | (*prin) (stream, " SLEEP"); |
| 440 | else if (IFMASK(0x00e0, 0x00a0)) |
| 441 | (*prin) (stream, " WDR"); |
| 442 | else if (IFMASK(0x00f0, 0x00c0)) |
| 443 | (*prin) (stream, " LPM"); |
| 444 | else if (IFMASK(0x00f0, 0x00d0)) |
| 445 | (*prin) (stream, " ELPM"); |
| 446 | else |
| 447 | (*prin) (stream, " ????"); |
| 448 | } |
| 449 | else |
| 450 | { |
| 451 | const char* p; |
| 452 | reg50(opcode, rd); |
| 453 | p = sect94[opcode & 0xf]; |
| 454 | if (!p) |
| 455 | p = "????"; |
| 456 | (*prin) (stream, " %-8s%s", p, rd); |
| 457 | } |
| 458 | } |
| 459 | break; |
| 460 | case 0x0600: |
| 461 | { |
| 462 | if (opcode & 0x0200) |
| 463 | { |
| 464 | lit204(opcode, rd); |
| 465 | reg20w(opcode, rr); |
| 466 | if (opcode & 0x0100) |
| 467 | (*prin) (stream, " SBIW %s,%s", rr, rd); |
| 468 | else |
| 469 | (*prin) (stream, " ADIW %s,%s", rr, rd); |
| 470 | } |
| 471 | } |
| 472 | break; |
| 473 | case 0x0800: |
| 474 | case 0x0a00: |
| 475 | { |
| 476 | (*prin) (stream, " %-8s0x%02X,%d", |
| 477 | sect98[(opcode & 0x0300) >> 8], |
| 478 | (opcode & 0xf8) >> 3, |
| 479 | opcode & 7); |
| 480 | } |
| 481 | break; |
| 482 | default: |
| 483 | { |
| 484 | reg50(opcode, rd); |
| 485 | reg104(opcode, rr); |
| 486 | (*prin) (stream, " MUL %s,%s", rd, rr); |
| 487 | } |
| 488 | } |
| 489 | } |
| 490 | break; |
| 491 | case 0xb000: |
| 492 | { |
| 493 | reg50(opcode, rd); |
| 494 | regPP(opcode, rr); |
| 495 | if (opcode & 0x0800) |
| 496 | (*prin) (stream, " OUT %s,%s", rr, rd); |
| 497 | else |
| 498 | (*prin) (stream, " IN %s,%s", rd, rr); |
| 499 | } |
| 500 | break; |
| 501 | case 0xc000: |
| 502 | { |
| 503 | add0fff(opcode, rd, addr); |
| 504 | (*prin) (stream, " RJMP %s", rd); |
| 505 | } |
| 506 | break; |
| 507 | case 0xd000: |
| 508 | { |
| 509 | add0fff(opcode, rd, addr); |
| 510 | (*prin) (stream, " RCALL %s", rd); |
| 511 | } |
| 512 | break; |
| 513 | case 0xe000: |
| 514 | { |
| 515 | reg40(opcode, rd); |
| 516 | lit404(opcode, rr); |
| 517 | (*prin) (stream, " LDI %s,%s", rd, rr); |
| 518 | } |
| 519 | break; |
| 520 | case 0xf000: |
| 521 | { |
| 522 | if (opcode & 0x0800) |
| 523 | { |
| 524 | reg50(opcode, rd); |
| 525 | (*prin) (stream, " %-8s%s,%d", |
| 526 | last4[(opcode & 0x0600) >> 9], |
| 527 | rd, opcode & 7); |
| 528 | } |
| 529 | else |
| 530 | { |
| 531 | char* p; |
| 532 | add03f8(opcode, rd, addr); |
| 533 | p = branchs[((opcode & 0x0400) >> 7) | (opcode & 7)]; |
| 534 | (*prin) (stream, " %-8s%s", p, rd); |
| 535 | } |
| 536 | } |
| 537 | break; |
| 538 | } |
| 539 | } |
| 540 | return cmd_len; |
| 541 | } |