| 1 | /* Print Motorola 68k instructions. |
| 2 | Copyright 1986, 1987, 1989, 1991, 1992, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is free software; you can redistribute it and/or modify |
| 5 | it under the terms of the GNU General Public License as published by |
| 6 | the Free Software Foundation; either version 2 of the License, or |
| 7 | (at your option) any later version. |
| 8 | |
| 9 | This program is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | GNU General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU General Public License |
| 15 | along with this program; if not, write to the Free Software |
| 16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 17 | |
| 18 | #include "dis-asm.h" |
| 19 | #include "ieee-float.h" |
| 20 | |
| 21 | extern CONST struct ext_format ext_format_68881; |
| 22 | |
| 23 | /* Opcode/m68k.h is a massive table. As a kludge, break it up into |
| 24 | two pieces. This makes nonportable C -- FIXME -- it assumes that |
| 25 | two data items declared near each other will be contiguous in |
| 26 | memory. This kludge can be removed, FIXME, when GCC is fixed to not |
| 27 | be a hog about initializers. */ |
| 28 | |
| 29 | #ifdef __GNUC__ |
| 30 | #define BREAK_UP_BIG_DECL }; \ |
| 31 | struct m68k_opcode m68k_opcodes_2[] = { |
| 32 | #define AND_OTHER_PART sizeof (m68k_opcodes_2) |
| 33 | #endif |
| 34 | |
| 35 | #include "opcode/m68k.h" |
| 36 | |
| 37 | |
| 38 | /* Local function prototypes */ |
| 39 | |
| 40 | static int |
| 41 | fetch_arg PARAMS ((unsigned char *, int, int, disassemble_info *)); |
| 42 | |
| 43 | static void |
| 44 | print_base PARAMS ((int, int, disassemble_info*)); |
| 45 | |
| 46 | static unsigned char * |
| 47 | print_indexed PARAMS ((int, unsigned char *, bfd_vma, disassemble_info *)); |
| 48 | |
| 49 | static unsigned char * |
| 50 | print_insn_arg PARAMS ((char *, unsigned char *, unsigned char *, bfd_vma, |
| 51 | disassemble_info *)); |
| 52 | |
| 53 | /* Sign-extend an (unsigned char). */ |
| 54 | #if __STDC__ == 1 |
| 55 | #define COERCE_SIGNED_CHAR(ch) ((signed char)(ch)) |
| 56 | #else |
| 57 | #define COERCE_SIGNED_CHAR(ch) ((int)(((ch) ^ 0x80) & 0xFF) - 128) |
| 58 | #endif |
| 59 | |
| 60 | CONST char * CONST fpcr_names[] = { |
| 61 | "", "fpiar", "fpsr", "fpiar/fpsr", "fpcr", |
| 62 | "fpiar/fpcr", "fpsr/fpcr", "fpiar/fpsr/fpcr"}; |
| 63 | |
| 64 | static char *reg_names[] = { |
| 65 | "d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "a0", |
| 66 | "a1", "a2", "a3", "a4", "a5", "fp", "sp", "ps", "pc"}; |
| 67 | |
| 68 | /* Define accessors for 68K's 1, 2, and 4-byte signed quantities. |
| 69 | The _SHIFT values move the quantity to the high order end of an |
| 70 | `int' value, so it will sign-extend. Probably a few more casts |
| 71 | are needed to make it compile without warnings on finicky systems. */ |
| 72 | #define BITS_PER_BYTE 8 |
| 73 | #define WORD_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 2)) |
| 74 | #define LONG_SHIFT (BITS_PER_BYTE * ((sizeof (int)) - 4)) |
| 75 | |
| 76 | #define NEXTBYTE(p) (p += 2, FETCH_DATA (info, p), COERCE_SIGNED_CHAR(p[-1])) |
| 77 | |
| 78 | #define NEXTWORD(p) \ |
| 79 | (p += 2, FETCH_DATA (info, p), \ |
| 80 | (((int)((p[-2] << 8) + p[-1])) << WORD_SHIFT) >> WORD_SHIFT) |
| 81 | |
| 82 | #define NEXTLONG(p) \ |
| 83 | (p += 4, FETCH_DATA (info, p), \ |
| 84 | (((int)((((((p[-4] << 8) + p[-3]) << 8) + p[-2]) << 8) + p[-1])) \ |
| 85 | << LONG_SHIFT) >> LONG_SHIFT) |
| 86 | |
| 87 | /* NEXTSINGLE and NEXTDOUBLE handle alignment problems, but not |
| 88 | * byte-swapping or other float format differences. FIXME! */ |
| 89 | |
| 90 | union number { |
| 91 | double d; |
| 92 | float f; |
| 93 | char c[10]; |
| 94 | }; |
| 95 | |
| 96 | #define NEXTSINGLE(val, p) \ |
| 97 | { int i; union number u;\ |
| 98 | FETCH_DATA (info, p + sizeof (float));\ |
| 99 | for (i = 0; i < sizeof(float); i++) u.c[i] = *p++; \ |
| 100 | val = u.f; } |
| 101 | |
| 102 | #define NEXTDOUBLE(val, p) \ |
| 103 | { int i; union number u;\ |
| 104 | FETCH_DATA (info, p + sizeof (double));\ |
| 105 | for (i = 0; i < sizeof(double); i++) u.c[i] = *p++; \ |
| 106 | val = u.d; } |
| 107 | |
| 108 | /* Need a function to convert from extended to double precision... */ |
| 109 | #define NEXTEXTEND(p) \ |
| 110 | (p += 12, FETCH_DATA (info, p), 0.0) |
| 111 | |
| 112 | /* Need a function to convert from packed to double |
| 113 | precision. Actually, it's easier to print a |
| 114 | packed number than a double anyway, so maybe |
| 115 | there should be a special case to handle this... */ |
| 116 | #define NEXTPACKED(p) \ |
| 117 | (p += 12, FETCH_DATA (info, p), 0.0) |
| 118 | |
| 119 | \f |
| 120 | /* Maximum length of an instruction. */ |
| 121 | #define MAXLEN 22 |
| 122 | |
| 123 | #include <setjmp.h> |
| 124 | |
| 125 | struct private |
| 126 | { |
| 127 | /* Points to first byte not fetched. */ |
| 128 | bfd_byte *max_fetched; |
| 129 | bfd_byte the_buffer[MAXLEN]; |
| 130 | bfd_vma insn_start; |
| 131 | jmp_buf bailout; |
| 132 | }; |
| 133 | |
| 134 | /* Make sure that bytes from INFO->PRIVATE_DATA->BUFFER (inclusive) |
| 135 | to ADDR (exclusive) are valid. Returns 1 for success, longjmps |
| 136 | on error. */ |
| 137 | #define FETCH_DATA(info, addr) \ |
| 138 | ((addr) <= ((struct private *)(info->private_data))->max_fetched \ |
| 139 | ? 1 : fetch_data ((info), (addr))) |
| 140 | |
| 141 | static int |
| 142 | fetch_data (info, addr) |
| 143 | struct disassemble_info *info; |
| 144 | bfd_byte *addr; |
| 145 | { |
| 146 | int status; |
| 147 | struct private *priv = (struct private *)info->private_data; |
| 148 | bfd_vma start = priv->insn_start + (priv->max_fetched - priv->the_buffer); |
| 149 | |
| 150 | status = (*info->read_memory_func) (start, |
| 151 | priv->max_fetched, |
| 152 | addr - priv->max_fetched, |
| 153 | info); |
| 154 | if (status != 0) |
| 155 | { |
| 156 | (*info->memory_error_func) (status, start, info); |
| 157 | longjmp (priv->bailout, 1); |
| 158 | } |
| 159 | else |
| 160 | priv->max_fetched = addr; |
| 161 | return 1; |
| 162 | } |
| 163 | \f |
| 164 | static void |
| 165 | m68k_opcode_error(info, code, place) |
| 166 | struct disassemble_info *info; |
| 167 | int code, place; |
| 168 | { |
| 169 | (*info->fprintf_func)(info->stream, |
| 170 | "<internal error in opcode table: \"%c%c\">", |
| 171 | code, place); |
| 172 | } |
| 173 | |
| 174 | /* Print the m68k instruction at address MEMADDR in debugged memory, |
| 175 | on STREAM. Returns length of the instruction, in bytes. */ |
| 176 | |
| 177 | int |
| 178 | print_insn_m68k (memaddr, info) |
| 179 | bfd_vma memaddr; |
| 180 | disassemble_info *info; |
| 181 | { |
| 182 | register int i; |
| 183 | register unsigned char *p; |
| 184 | register char *d; |
| 185 | register unsigned long bestmask; |
| 186 | int best; |
| 187 | struct private priv; |
| 188 | bfd_byte *buffer = priv.the_buffer; |
| 189 | |
| 190 | info->private_data = (PTR) &priv; |
| 191 | priv.max_fetched = priv.the_buffer; |
| 192 | priv.insn_start = memaddr; |
| 193 | if (setjmp (priv.bailout) != 0) |
| 194 | /* Error return. */ |
| 195 | return -1; |
| 196 | |
| 197 | bestmask = 0; |
| 198 | best = -1; |
| 199 | FETCH_DATA (info, buffer + 2); |
| 200 | for (i = 0; i < numopcodes; i++) |
| 201 | { |
| 202 | register unsigned long opcode = m68k_opcodes[i].opcode; |
| 203 | register unsigned long match = m68k_opcodes[i].match; |
| 204 | if (((0xff & buffer[0] & (match >> 24)) == (0xff & (opcode >> 24))) |
| 205 | && ((0xff & buffer[1] & (match >> 16)) == (0xff & (opcode >> 16))) |
| 206 | /* Only fetch the next two bytes if we need to. */ |
| 207 | && (((0xffff & match) == 0) |
| 208 | || |
| 209 | (FETCH_DATA (info, buffer + 4) |
| 210 | && ((0xff & buffer[2] & (match >> 8)) == (0xff & (opcode >> 8))) |
| 211 | && ((0xff & buffer[3] & match) == (0xff & opcode))) |
| 212 | )) |
| 213 | { |
| 214 | /* Don't use for printout the variants of divul and divsl |
| 215 | that have the same register number in two places. |
| 216 | The more general variants will match instead. */ |
| 217 | for (d = m68k_opcodes[i].args; *d; d += 2) |
| 218 | if (d[1] == 'D') |
| 219 | break; |
| 220 | |
| 221 | /* Don't use for printout the variants of most floating |
| 222 | point coprocessor instructions which use the same |
| 223 | register number in two places, as above. */ |
| 224 | if (*d == 0) |
| 225 | for (d = m68k_opcodes[i].args; *d; d += 2) |
| 226 | if (d[1] == 't') |
| 227 | break; |
| 228 | |
| 229 | if (*d == 0 && match > bestmask) |
| 230 | { |
| 231 | best = i; |
| 232 | bestmask = match; |
| 233 | } |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | /* Handle undefined instructions. */ |
| 238 | if (best < 0) |
| 239 | { |
| 240 | (*info->fprintf_func) (info->stream, "0%o", |
| 241 | (buffer[0] << 8) + buffer[1]); |
| 242 | return 2; |
| 243 | } |
| 244 | |
| 245 | (*info->fprintf_func) (info->stream, "%s", m68k_opcodes[best].name); |
| 246 | |
| 247 | /* Point at first word of argument data, |
| 248 | and at descriptor for first argument. */ |
| 249 | p = buffer + 2; |
| 250 | |
| 251 | /* Figure out how long the fixed-size portion of the instruction is. |
| 252 | The only place this is stored in the opcode table is |
| 253 | in the arguments--look for arguments which specify fields in the 2nd |
| 254 | or 3rd words of the instruction. */ |
| 255 | for (d = m68k_opcodes[best].args; *d; d += 2) |
| 256 | { |
| 257 | /* I don't think it is necessary to be checking d[0] here; I suspect |
| 258 | all this could be moved to the case statement below. */ |
| 259 | if (d[0] == '#') |
| 260 | { |
| 261 | if (d[1] == 'l' && p - buffer < 6) |
| 262 | p = buffer + 6; |
| 263 | else if (p - buffer < 4 && d[1] != 'C' && d[1] != '8' ) |
| 264 | p = buffer + 4; |
| 265 | } |
| 266 | if ((d[0] == 'L' || d[0] == 'l') && d[1] == 'w' && p - buffer < 4) |
| 267 | p = buffer + 4; |
| 268 | switch (d[1]) |
| 269 | { |
| 270 | case '1': |
| 271 | case '2': |
| 272 | case '3': |
| 273 | case '7': |
| 274 | case '8': |
| 275 | case '9': |
| 276 | if (p - buffer < 4) |
| 277 | p = buffer + 4; |
| 278 | break; |
| 279 | case '4': |
| 280 | case '5': |
| 281 | case '6': |
| 282 | if (p - buffer < 6) |
| 283 | p = buffer + 6; |
| 284 | break; |
| 285 | default: |
| 286 | break; |
| 287 | } |
| 288 | } |
| 289 | /* pflusha is an exception; it takes no arguments but is two words long. */ |
| 290 | if (buffer[0] == 0xf0 && buffer[1] == 0 && buffer[2] == 0x24 && |
| 291 | buffer[3] == 0) |
| 292 | p = buffer + 4; |
| 293 | |
| 294 | FETCH_DATA (info, p); |
| 295 | |
| 296 | d = m68k_opcodes[best].args; |
| 297 | |
| 298 | if (*d) |
| 299 | (*info->fprintf_func) (info->stream, " "); |
| 300 | |
| 301 | while (*d) |
| 302 | { |
| 303 | p = print_insn_arg (d, buffer, p, memaddr + p - buffer, info); |
| 304 | d += 2; |
| 305 | if (*d && *(d - 2) != 'I' && *d != 'k') |
| 306 | (*info->fprintf_func) (info->stream, ","); |
| 307 | } |
| 308 | return p - buffer; |
| 309 | } |
| 310 | |
| 311 | static unsigned char * |
| 312 | print_insn_arg (d, buffer, p, addr, info) |
| 313 | char *d; |
| 314 | unsigned char *buffer; |
| 315 | register unsigned char *p; |
| 316 | bfd_vma addr; /* PC for this arg to be relative to */ |
| 317 | disassemble_info *info; |
| 318 | { |
| 319 | register int val = 0; |
| 320 | register int place = d[1]; |
| 321 | int regno; |
| 322 | register CONST char *regname; |
| 323 | register unsigned char *p1; |
| 324 | double flval; |
| 325 | int flt_p; |
| 326 | |
| 327 | switch (*d) |
| 328 | { |
| 329 | case 'c': /* cache identifier */ |
| 330 | { |
| 331 | static char *cacheFieldName[] = { "NOP", "dc", "ic", "bc" }; |
| 332 | val = fetch_arg (buffer, place, 2, info); |
| 333 | (*info->fprintf_func) (info->stream, cacheFieldName[val]); |
| 334 | break; |
| 335 | } |
| 336 | |
| 337 | case 'a': /* address register indirect only. Cf. case '+'. */ |
| 338 | { |
| 339 | (*info->fprintf_func) |
| 340 | (info->stream, |
| 341 | "%s@", |
| 342 | reg_names [fetch_arg (buffer, place, 3, info) + 8]); |
| 343 | break; |
| 344 | } |
| 345 | |
| 346 | case '_': /* 32-bit absolute address for move16. */ |
| 347 | { |
| 348 | val = NEXTLONG (p); |
| 349 | (*info->fprintf_func) (info->stream, "@#"); |
| 350 | (*info->print_address_func) (val, info); |
| 351 | break; |
| 352 | } |
| 353 | |
| 354 | case 'C': |
| 355 | (*info->fprintf_func) (info->stream, "ccr"); |
| 356 | break; |
| 357 | |
| 358 | case 'S': |
| 359 | (*info->fprintf_func) (info->stream, "sr"); |
| 360 | break; |
| 361 | |
| 362 | case 'U': |
| 363 | (*info->fprintf_func) (info->stream, "usp"); |
| 364 | break; |
| 365 | |
| 366 | case 'J': |
| 367 | { |
| 368 | static struct { char *name; int value; } names[] |
| 369 | = {{"sfc", 0x000}, {"dfc", 0x001}, {"cacr", 0x002}, |
| 370 | {"tc", 0x003}, {"itt0",0x004}, {"itt1", 0x005}, |
| 371 | {"dtt0",0x006}, {"dtt1",0x007}, |
| 372 | {"usp", 0x800}, {"vbr", 0x801}, {"caar", 0x802}, |
| 373 | {"msp", 0x803}, {"isp", 0x804}, |
| 374 | |
| 375 | /* Should we be calling this psr like we do in case 'Y'? */ |
| 376 | {"mmusr",0x805}, |
| 377 | |
| 378 | {"urp", 0x806}, {"srp", 0x807}}; |
| 379 | |
| 380 | val = fetch_arg (buffer, place, 12, info); |
| 381 | for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--) |
| 382 | if (names[regno].value == val) |
| 383 | { |
| 384 | (*info->fprintf_func) (info->stream, names[regno].name); |
| 385 | break; |
| 386 | } |
| 387 | if (regno < 0) |
| 388 | (*info->fprintf_func) (info->stream, "%d", val); |
| 389 | } |
| 390 | break; |
| 391 | |
| 392 | case 'Q': |
| 393 | val = fetch_arg (buffer, place, 3, info); |
| 394 | /* 0 means 8, except for the bkpt instruction... */ |
| 395 | if (val == 0 && d[1] != 's') |
| 396 | val = 8; |
| 397 | (*info->fprintf_func) (info->stream, "#%d", val); |
| 398 | break; |
| 399 | |
| 400 | case 'M': |
| 401 | val = fetch_arg (buffer, place, 8, info); |
| 402 | if (val & 0x80) |
| 403 | val = val - 0x100; |
| 404 | (*info->fprintf_func) (info->stream, "#%d", val); |
| 405 | break; |
| 406 | |
| 407 | case 'T': |
| 408 | val = fetch_arg (buffer, place, 4, info); |
| 409 | (*info->fprintf_func) (info->stream, "#%d", val); |
| 410 | break; |
| 411 | |
| 412 | case 'D': |
| 413 | (*info->fprintf_func) (info->stream, "%s", |
| 414 | reg_names[fetch_arg (buffer, place, 3, info)]); |
| 415 | break; |
| 416 | |
| 417 | case 'A': |
| 418 | (*info->fprintf_func) |
| 419 | (info->stream, "%s", |
| 420 | reg_names[fetch_arg (buffer, place, 3, info) + 010]); |
| 421 | break; |
| 422 | |
| 423 | case 'R': |
| 424 | (*info->fprintf_func) |
| 425 | (info->stream, "%s", |
| 426 | reg_names[fetch_arg (buffer, place, 4, info)]); |
| 427 | break; |
| 428 | |
| 429 | case 'r': |
| 430 | (*info->fprintf_func) |
| 431 | (info->stream, "%s@", |
| 432 | reg_names[fetch_arg (buffer, place, 4, info)]); |
| 433 | break; |
| 434 | |
| 435 | case 'F': |
| 436 | (*info->fprintf_func) |
| 437 | (info->stream, "fp%d", |
| 438 | fetch_arg (buffer, place, 3, info)); |
| 439 | break; |
| 440 | |
| 441 | case 'O': |
| 442 | val = fetch_arg (buffer, place, 6, info); |
| 443 | if (val & 0x20) |
| 444 | (*info->fprintf_func) (info->stream, "%s", reg_names [val & 7]); |
| 445 | else |
| 446 | (*info->fprintf_func) (info->stream, "%d", val); |
| 447 | break; |
| 448 | |
| 449 | case '+': |
| 450 | (*info->fprintf_func) |
| 451 | (info->stream, "%s@+", |
| 452 | reg_names[fetch_arg (buffer, place, 3, info) + 8]); |
| 453 | break; |
| 454 | |
| 455 | case '-': |
| 456 | (*info->fprintf_func) |
| 457 | (info->stream, "%s@-", |
| 458 | reg_names[fetch_arg (buffer, place, 3, info) + 8]); |
| 459 | break; |
| 460 | |
| 461 | case 'k': |
| 462 | if (place == 'k') |
| 463 | (*info->fprintf_func) |
| 464 | (info->stream, "{%s}", |
| 465 | reg_names[fetch_arg (buffer, place, 3, info)]); |
| 466 | else if (place == 'C') |
| 467 | { |
| 468 | val = fetch_arg (buffer, place, 7, info); |
| 469 | if ( val > 63 ) /* This is a signed constant. */ |
| 470 | val -= 128; |
| 471 | (*info->fprintf_func) (info->stream, "{#%d}", val); |
| 472 | } |
| 473 | else |
| 474 | m68k_opcode_error (info, *d, place); |
| 475 | break; |
| 476 | |
| 477 | case '#': |
| 478 | case '^': |
| 479 | p1 = buffer + (*d == '#' ? 2 : 4); |
| 480 | if (place == 's') |
| 481 | val = fetch_arg (buffer, place, 4, info); |
| 482 | else if (place == 'C') |
| 483 | val = fetch_arg (buffer, place, 7, info); |
| 484 | else if (place == '8') |
| 485 | val = fetch_arg (buffer, place, 3, info); |
| 486 | else if (place == '3') |
| 487 | val = fetch_arg (buffer, place, 8, info); |
| 488 | else if (place == 'b') |
| 489 | val = NEXTBYTE (p1); |
| 490 | else if (place == 'w') |
| 491 | val = NEXTWORD (p1); |
| 492 | else if (place == 'l') |
| 493 | val = NEXTLONG (p1); |
| 494 | else |
| 495 | m68k_opcode_error (info, *d, place); |
| 496 | (*info->fprintf_func) (info->stream, "#%d", val); |
| 497 | break; |
| 498 | |
| 499 | case 'B': |
| 500 | if (place == 'b') |
| 501 | val = NEXTBYTE (p); |
| 502 | else if (place == 'B') |
| 503 | val = COERCE_SIGNED_CHAR(buffer[1]); |
| 504 | else if (place == 'w' || place == 'W') |
| 505 | val = NEXTWORD (p); |
| 506 | else if (place == 'l' || place == 'L') |
| 507 | val = NEXTLONG (p); |
| 508 | else if (place == 'g') |
| 509 | { |
| 510 | val = NEXTBYTE (buffer); |
| 511 | if (val == 0) |
| 512 | val = NEXTWORD (p); |
| 513 | else if (val == -1) |
| 514 | val = NEXTLONG (p); |
| 515 | } |
| 516 | else if (place == 'c') |
| 517 | { |
| 518 | if (buffer[1] & 0x40) /* If bit six is one, long offset */ |
| 519 | val = NEXTLONG (p); |
| 520 | else |
| 521 | val = NEXTWORD (p); |
| 522 | } |
| 523 | else |
| 524 | m68k_opcode_error (info, *d, place); |
| 525 | |
| 526 | (*info->print_address_func) (addr + val, info); |
| 527 | break; |
| 528 | |
| 529 | case 'd': |
| 530 | val = NEXTWORD (p); |
| 531 | (*info->fprintf_func) |
| 532 | (info->stream, "%s@(%d)", |
| 533 | reg_names[fetch_arg (buffer, place, 3, info)], val); |
| 534 | break; |
| 535 | |
| 536 | case 's': |
| 537 | (*info->fprintf_func) (info->stream, "%s", |
| 538 | fpcr_names[fetch_arg (buffer, place, 3, info)]); |
| 539 | break; |
| 540 | |
| 541 | case 'I': |
| 542 | /* Get coprocessor ID... */ |
| 543 | val = fetch_arg (buffer, 'd', 3, info); |
| 544 | |
| 545 | if (val != 1) /* Unusual coprocessor ID? */ |
| 546 | (*info->fprintf_func) (info->stream, "(cpid=%d) ", val); |
| 547 | if (place == 'i') |
| 548 | p += 2; /* Skip coprocessor extended operands */ |
| 549 | break; |
| 550 | |
| 551 | case '*': |
| 552 | case '~': |
| 553 | case '%': |
| 554 | case ';': |
| 555 | case '@': |
| 556 | case '!': |
| 557 | case '$': |
| 558 | case '?': |
| 559 | case '/': |
| 560 | case '&': |
| 561 | case '`': |
| 562 | case '|': |
| 563 | |
| 564 | if (place == 'd') |
| 565 | { |
| 566 | val = fetch_arg (buffer, 'x', 6, info); |
| 567 | val = ((val & 7) << 3) + ((val >> 3) & 7); |
| 568 | } |
| 569 | else |
| 570 | val = fetch_arg (buffer, 's', 6, info); |
| 571 | |
| 572 | /* Get register number assuming address register. */ |
| 573 | regno = (val & 7) + 8; |
| 574 | regname = reg_names[regno]; |
| 575 | switch (val >> 3) |
| 576 | { |
| 577 | case 0: |
| 578 | (*info->fprintf_func) (info->stream, "%s", reg_names[val]); |
| 579 | break; |
| 580 | |
| 581 | case 1: |
| 582 | (*info->fprintf_func) (info->stream, "%s", regname); |
| 583 | break; |
| 584 | |
| 585 | case 2: |
| 586 | (*info->fprintf_func) (info->stream, "%s@", regname); |
| 587 | break; |
| 588 | |
| 589 | case 3: |
| 590 | (*info->fprintf_func) (info->stream, "%s@+", regname); |
| 591 | break; |
| 592 | |
| 593 | case 4: |
| 594 | (*info->fprintf_func) (info->stream, "%s@-", regname); |
| 595 | break; |
| 596 | |
| 597 | case 5: |
| 598 | val = NEXTWORD (p); |
| 599 | (*info->fprintf_func) (info->stream, "%s@(%d)", regname, val); |
| 600 | break; |
| 601 | |
| 602 | case 6: |
| 603 | p = print_indexed (regno, p, addr, info); |
| 604 | break; |
| 605 | |
| 606 | case 7: |
| 607 | switch (val & 7) |
| 608 | { |
| 609 | case 0: |
| 610 | val = NEXTWORD (p); |
| 611 | (*info->fprintf_func) (info->stream, "@#"); |
| 612 | (*info->print_address_func) (val, info); |
| 613 | break; |
| 614 | |
| 615 | case 1: |
| 616 | val = NEXTLONG (p); |
| 617 | (*info->fprintf_func) (info->stream, "@#"); |
| 618 | (*info->print_address_func) (val, info); |
| 619 | break; |
| 620 | |
| 621 | case 2: |
| 622 | val = NEXTWORD (p); |
| 623 | (*info->print_address_func) (addr + val, info); |
| 624 | break; |
| 625 | |
| 626 | case 3: |
| 627 | p = print_indexed (-1, p, addr, info); |
| 628 | break; |
| 629 | |
| 630 | case 4: |
| 631 | flt_p = 1; /* Assume it's a float... */ |
| 632 | switch( place ) |
| 633 | { |
| 634 | case 'b': |
| 635 | val = NEXTBYTE (p); |
| 636 | flt_p = 0; |
| 637 | break; |
| 638 | |
| 639 | case 'w': |
| 640 | val = NEXTWORD (p); |
| 641 | flt_p = 0; |
| 642 | break; |
| 643 | |
| 644 | case 'l': |
| 645 | val = NEXTLONG (p); |
| 646 | flt_p = 0; |
| 647 | break; |
| 648 | |
| 649 | case 'f': |
| 650 | NEXTSINGLE(flval, p); |
| 651 | break; |
| 652 | |
| 653 | case 'F': |
| 654 | NEXTDOUBLE(flval, p); |
| 655 | break; |
| 656 | |
| 657 | case 'x': |
| 658 | ieee_extended_to_double (&ext_format_68881, |
| 659 | (char *)p, &flval); |
| 660 | p += 12; |
| 661 | break; |
| 662 | |
| 663 | case 'p': |
| 664 | flval = NEXTPACKED(p); |
| 665 | break; |
| 666 | |
| 667 | default: |
| 668 | m68k_opcode_error (info, *d, place); |
| 669 | } |
| 670 | if ( flt_p ) /* Print a float? */ |
| 671 | (*info->fprintf_func) (info->stream, "#%g", flval); |
| 672 | else |
| 673 | (*info->fprintf_func) (info->stream, "#%d", val); |
| 674 | break; |
| 675 | |
| 676 | default: |
| 677 | (*info->fprintf_func) (info->stream, |
| 678 | "<invalid address mode 0%o>", |
| 679 | (unsigned) val); |
| 680 | } |
| 681 | } |
| 682 | break; |
| 683 | |
| 684 | case 'L': |
| 685 | case 'l': |
| 686 | if (place == 'w') |
| 687 | { |
| 688 | char doneany; |
| 689 | p1 = buffer + 2; |
| 690 | val = NEXTWORD (p1); |
| 691 | /* Move the pointer ahead if this point is farther ahead |
| 692 | than the last. */ |
| 693 | p = p1 > p ? p1 : p; |
| 694 | if (val == 0) |
| 695 | { |
| 696 | (*info->fprintf_func) (info->stream, "#0"); |
| 697 | break; |
| 698 | } |
| 699 | if (*d == 'l') |
| 700 | { |
| 701 | register int newval = 0; |
| 702 | for (regno = 0; regno < 16; ++regno) |
| 703 | if (val & (0x8000 >> regno)) |
| 704 | newval |= 1 << regno; |
| 705 | val = newval; |
| 706 | } |
| 707 | val &= 0xffff; |
| 708 | doneany = 0; |
| 709 | for (regno = 0; regno < 16; ++regno) |
| 710 | if (val & (1 << regno)) |
| 711 | { |
| 712 | int first_regno; |
| 713 | if (doneany) |
| 714 | (*info->fprintf_func) (info->stream, "/"); |
| 715 | doneany = 1; |
| 716 | (*info->fprintf_func) (info->stream, "%s", reg_names[regno]); |
| 717 | first_regno = regno; |
| 718 | while (val & (1 << (regno + 1))) |
| 719 | ++regno; |
| 720 | if (regno > first_regno) |
| 721 | (*info->fprintf_func) (info->stream, "-%s", |
| 722 | reg_names[regno]); |
| 723 | } |
| 724 | } |
| 725 | else if (place == '3') |
| 726 | { |
| 727 | /* `fmovem' insn. */ |
| 728 | char doneany; |
| 729 | val = fetch_arg (buffer, place, 8, info); |
| 730 | if (val == 0) |
| 731 | { |
| 732 | (*info->fprintf_func) (info->stream, "#0"); |
| 733 | break; |
| 734 | } |
| 735 | if (*d == 'l') |
| 736 | { |
| 737 | register int newval = 0; |
| 738 | for (regno = 0; regno < 8; ++regno) |
| 739 | if (val & (0x80 >> regno)) |
| 740 | newval |= 1 << regno; |
| 741 | val = newval; |
| 742 | } |
| 743 | val &= 0xff; |
| 744 | doneany = 0; |
| 745 | for (regno = 0; regno < 8; ++regno) |
| 746 | if (val & (1 << regno)) |
| 747 | { |
| 748 | int first_regno; |
| 749 | if (doneany) |
| 750 | (*info->fprintf_func) (info->stream, "/"); |
| 751 | doneany = 1; |
| 752 | (*info->fprintf_func) (info->stream, "fp%d", regno); |
| 753 | first_regno = regno; |
| 754 | while (val & (1 << (regno + 1))) |
| 755 | ++regno; |
| 756 | if (regno > first_regno) |
| 757 | (*info->fprintf_func) (info->stream, "-fp%d", regno); |
| 758 | } |
| 759 | } |
| 760 | else |
| 761 | goto de_fault; |
| 762 | break; |
| 763 | |
| 764 | case 'X': |
| 765 | place = '8'; |
| 766 | case 'Y': |
| 767 | case 'Z': |
| 768 | case 'W': |
| 769 | case '3': |
| 770 | case 'P': |
| 771 | { |
| 772 | int val = fetch_arg (buffer, place, 5, info); |
| 773 | char *name = 0; |
| 774 | switch (val) |
| 775 | { |
| 776 | case 2: name = "tt0"; break; |
| 777 | case 3: name = "tt1"; break; |
| 778 | case 0x10: name = "tc"; break; |
| 779 | case 0x11: name = "drp"; break; |
| 780 | case 0x12: name = "srp"; break; |
| 781 | case 0x13: name = "crp"; break; |
| 782 | case 0x14: name = "cal"; break; |
| 783 | case 0x15: name = "val"; break; |
| 784 | case 0x16: name = "scc"; break; |
| 785 | case 0x17: name = "ac"; break; |
| 786 | case 0x18: name = "psr"; break; |
| 787 | case 0x19: name = "pcsr"; break; |
| 788 | case 0x1c: |
| 789 | case 0x1d: |
| 790 | { |
| 791 | int break_reg = ((buffer[3] >> 2) & 7); |
| 792 | (*info->fprintf_func) |
| 793 | (info->stream, val == 0x1c ? "bad%d" : "bac%d", |
| 794 | break_reg); |
| 795 | } |
| 796 | break; |
| 797 | default: |
| 798 | (*info->fprintf_func) (info->stream, "<mmu register %d>", val); |
| 799 | } |
| 800 | if (name) |
| 801 | (*info->fprintf_func) (info->stream, name); |
| 802 | } |
| 803 | break; |
| 804 | |
| 805 | case 'f': |
| 806 | { |
| 807 | int fc = fetch_arg (buffer, place, 5, info); |
| 808 | if (fc == 1) |
| 809 | (*info->fprintf_func) (info->stream, "dfc"); |
| 810 | else if (fc == 0) |
| 811 | (*info->fprintf_func) (info->stream, "sfc"); |
| 812 | else |
| 813 | (*info->fprintf_func) (info->stream, "<function code %d>", fc); |
| 814 | } |
| 815 | break; |
| 816 | |
| 817 | case 'V': |
| 818 | (*info->fprintf_func) (info->stream, "val"); |
| 819 | break; |
| 820 | |
| 821 | case 't': |
| 822 | { |
| 823 | int level = fetch_arg (buffer, place, 3, info); |
| 824 | (*info->fprintf_func) (info->stream, "%d", level); |
| 825 | } |
| 826 | break; |
| 827 | |
| 828 | default: de_fault: |
| 829 | m68k_opcode_error (info, *d, ' '); |
| 830 | } |
| 831 | |
| 832 | return (unsigned char *) p; |
| 833 | } |
| 834 | |
| 835 | /* Fetch BITS bits from a position in the instruction specified by CODE. |
| 836 | CODE is a "place to put an argument", or 'x' for a destination |
| 837 | that is a general address (mode and register). |
| 838 | BUFFER contains the instruction. */ |
| 839 | |
| 840 | static int |
| 841 | fetch_arg (buffer, code, bits, info) |
| 842 | unsigned char *buffer; |
| 843 | int code; |
| 844 | int bits; |
| 845 | disassemble_info *info; |
| 846 | { |
| 847 | register int val = 0; |
| 848 | switch (code) |
| 849 | { |
| 850 | case 's': |
| 851 | val = buffer[1]; |
| 852 | break; |
| 853 | |
| 854 | case 'd': /* Destination, for register or quick. */ |
| 855 | val = (buffer[0] << 8) + buffer[1]; |
| 856 | val >>= 9; |
| 857 | break; |
| 858 | |
| 859 | case 'x': /* Destination, for general arg */ |
| 860 | val = (buffer[0] << 8) + buffer[1]; |
| 861 | val >>= 6; |
| 862 | break; |
| 863 | |
| 864 | case 'k': |
| 865 | FETCH_DATA (info, buffer + 3); |
| 866 | val = (buffer[3] >> 4); |
| 867 | break; |
| 868 | |
| 869 | case 'C': |
| 870 | FETCH_DATA (info, buffer + 3); |
| 871 | val = buffer[3]; |
| 872 | break; |
| 873 | |
| 874 | case '1': |
| 875 | FETCH_DATA (info, buffer + 3); |
| 876 | val = (buffer[2] << 8) + buffer[3]; |
| 877 | val >>= 12; |
| 878 | break; |
| 879 | |
| 880 | case '2': |
| 881 | FETCH_DATA (info, buffer + 3); |
| 882 | val = (buffer[2] << 8) + buffer[3]; |
| 883 | val >>= 6; |
| 884 | break; |
| 885 | |
| 886 | case '3': |
| 887 | case 'j': |
| 888 | FETCH_DATA (info, buffer + 3); |
| 889 | val = (buffer[2] << 8) + buffer[3]; |
| 890 | break; |
| 891 | |
| 892 | case '4': |
| 893 | FETCH_DATA (info, buffer + 5); |
| 894 | val = (buffer[4] << 8) + buffer[5]; |
| 895 | val >>= 12; |
| 896 | break; |
| 897 | |
| 898 | case '5': |
| 899 | FETCH_DATA (info, buffer + 5); |
| 900 | val = (buffer[4] << 8) + buffer[5]; |
| 901 | val >>= 6; |
| 902 | break; |
| 903 | |
| 904 | case '6': |
| 905 | FETCH_DATA (info, buffer + 5); |
| 906 | val = (buffer[4] << 8) + buffer[5]; |
| 907 | break; |
| 908 | |
| 909 | case '7': |
| 910 | FETCH_DATA (info, buffer + 3); |
| 911 | val = (buffer[2] << 8) + buffer[3]; |
| 912 | val >>= 7; |
| 913 | break; |
| 914 | |
| 915 | case '8': |
| 916 | FETCH_DATA (info, buffer + 3); |
| 917 | val = (buffer[2] << 8) + buffer[3]; |
| 918 | val >>= 10; |
| 919 | break; |
| 920 | |
| 921 | case '9': |
| 922 | FETCH_DATA (info, buffer + 3); |
| 923 | val = (buffer[2] << 8) + buffer[3]; |
| 924 | val >>= 5; |
| 925 | break; |
| 926 | |
| 927 | case 'e': |
| 928 | val = (buffer[1] >> 6); |
| 929 | break; |
| 930 | |
| 931 | default: |
| 932 | abort (); |
| 933 | } |
| 934 | |
| 935 | switch (bits) |
| 936 | { |
| 937 | case 2: |
| 938 | return val & 3; |
| 939 | case 3: |
| 940 | return val & 7; |
| 941 | case 4: |
| 942 | return val & 017; |
| 943 | case 5: |
| 944 | return val & 037; |
| 945 | case 6: |
| 946 | return val & 077; |
| 947 | case 7: |
| 948 | return val & 0177; |
| 949 | case 8: |
| 950 | return val & 0377; |
| 951 | case 12: |
| 952 | return val & 07777; |
| 953 | default: |
| 954 | abort (); |
| 955 | } |
| 956 | } |
| 957 | |
| 958 | /* Print an indexed argument. The base register is BASEREG (-1 for pc). |
| 959 | P points to extension word, in buffer. |
| 960 | ADDR is the nominal core address of that extension word. */ |
| 961 | |
| 962 | static unsigned char * |
| 963 | print_indexed (basereg, p, addr, info) |
| 964 | int basereg; |
| 965 | unsigned char *p; |
| 966 | bfd_vma addr; |
| 967 | disassemble_info *info; |
| 968 | { |
| 969 | register int word; |
| 970 | static char *scales[] = {"", "*2", "*4", "*8"}; |
| 971 | register int base_disp; |
| 972 | register int outer_disp; |
| 973 | char buf[40]; |
| 974 | |
| 975 | word = NEXTWORD (p); |
| 976 | |
| 977 | /* Generate the text for the index register. |
| 978 | Where this will be output is not yet determined. */ |
| 979 | sprintf (buf, "[%s.%c%s]", |
| 980 | reg_names[(word >> 12) & 0xf], |
| 981 | (word & 0x800) ? 'l' : 'w', |
| 982 | scales[(word >> 9) & 3]); |
| 983 | |
| 984 | /* Handle the 68000 style of indexing. */ |
| 985 | |
| 986 | if ((word & 0x100) == 0) |
| 987 | { |
| 988 | print_base (basereg, |
| 989 | ((word & 0x80) ? word | 0xff00 : word & 0xff) |
| 990 | + ((basereg == -1) ? addr : 0), |
| 991 | info); |
| 992 | (*info->fprintf_func) (info->stream, "%s", buf); |
| 993 | return p; |
| 994 | } |
| 995 | |
| 996 | /* Handle the generalized kind. */ |
| 997 | /* First, compute the displacement to add to the base register. */ |
| 998 | |
| 999 | if (word & 0200) |
| 1000 | basereg = -2; |
| 1001 | if (word & 0100) |
| 1002 | buf[0] = 0; |
| 1003 | base_disp = 0; |
| 1004 | switch ((word >> 4) & 3) |
| 1005 | { |
| 1006 | case 2: |
| 1007 | base_disp = NEXTWORD (p); |
| 1008 | break; |
| 1009 | case 3: |
| 1010 | base_disp = NEXTLONG (p); |
| 1011 | } |
| 1012 | if (basereg == -1) |
| 1013 | base_disp += addr; |
| 1014 | |
| 1015 | /* Handle single-level case (not indirect) */ |
| 1016 | |
| 1017 | if ((word & 7) == 0) |
| 1018 | { |
| 1019 | print_base (basereg, base_disp, info); |
| 1020 | (*info->fprintf_func) (info->stream, "%s", buf); |
| 1021 | return p; |
| 1022 | } |
| 1023 | |
| 1024 | /* Two level. Compute displacement to add after indirection. */ |
| 1025 | |
| 1026 | outer_disp = 0; |
| 1027 | switch (word & 3) |
| 1028 | { |
| 1029 | case 2: |
| 1030 | outer_disp = NEXTWORD (p); |
| 1031 | break; |
| 1032 | case 3: |
| 1033 | outer_disp = NEXTLONG (p); |
| 1034 | } |
| 1035 | |
| 1036 | (*info->fprintf_func) (info->stream, "%d(", outer_disp); |
| 1037 | print_base (basereg, base_disp, info); |
| 1038 | |
| 1039 | /* If postindexed, print the closeparen before the index. */ |
| 1040 | if (word & 4) |
| 1041 | (*info->fprintf_func) (info->stream, ")%s", buf); |
| 1042 | /* If preindexed, print the closeparen after the index. */ |
| 1043 | else |
| 1044 | (*info->fprintf_func) (info->stream, "%s)", buf); |
| 1045 | |
| 1046 | return p; |
| 1047 | } |
| 1048 | |
| 1049 | /* Print a base register REGNO and displacement DISP, on INFO->STREAM. |
| 1050 | REGNO = -1 for pc, -2 for none (suppressed). */ |
| 1051 | |
| 1052 | static void |
| 1053 | print_base (regno, disp, info) |
| 1054 | int regno; |
| 1055 | int disp; |
| 1056 | disassemble_info *info; |
| 1057 | { |
| 1058 | if (regno == -2) |
| 1059 | (*info->fprintf_func) (info->stream, "%d", disp); |
| 1060 | else if (regno == -1) |
| 1061 | (*info->fprintf_func) (info->stream, "0x%x", (unsigned) disp); |
| 1062 | else |
| 1063 | (*info->fprintf_func) (info->stream, "%d(%s)", disp, reg_names[regno]); |
| 1064 | } |