target-m68k/op.c

   1 /*
   2  *  m68k micro operations
   3  *
   4  *  Copyright (c) 2006-2007 CodeSourcery
   5  *  Written by Paul Brook
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "exec.h"
  23 #include "m68k-qreg.h"
  24
  25 #ifndef offsetof
  26 #define offsetof(type, field) ((size_t) &((type *)0)->field)
  27 #endif
  28
  29 static long qreg_offsets[] = {
  30 #define DEFO32(name, offset) offsetof(CPUState, offset),
  31 #define DEFR(name, reg, mode) -1,
  32 #define DEFF64(name, offset) offsetof(CPUState, offset),
  33     0,
  34 #include "qregs.def"
  35 };
  36
  37 #define CPU_FP_STATUS env->fp_status
  38
  39 #define RAISE_EXCEPTION(n) do { \
  40     env->exception_index = n; \
  41     cpu_loop_exit(); \
  42     } while(0)
  43
  44 #define get_op helper_get_op
  45 #define set_op helper_set_op
  46 #define get_opf64 helper_get_opf64
  47 #define set_opf64 helper_set_opf64
  48 uint32_t
  49 get_op(int qreg)
  50 {
  51     if (qreg >= TARGET_NUM_QREGS) {
  52         return env->qregs[qreg - TARGET_NUM_QREGS];
  53     } else if (qreg == QREG_T0) {
  54         return T0;
  55     } else {
  56         return *(uint32_t *)(((long)env) + qreg_offsets[qreg]);
  57     }
  58 }
  59
  60 void set_op(int qreg, uint32_t val)
  61 {
  62     if (qreg >= TARGET_NUM_QREGS) {
  63         env->qregs[qreg - TARGET_NUM_QREGS] = val;
  64     } else if (qreg == QREG_T0) {
  65         T0 = val;
  66     } else {
  67         *(uint32_t *)(((long)env) + qreg_offsets[qreg]) = val;
  68     }
  69 }
  70
  71 float64 get_opf64(int qreg)
  72 {
  73     if (qreg < TARGET_NUM_QREGS) {
  74         return *(float64 *)(((long)env) + qreg_offsets[qreg]);
  75     } else {
  76         return *(float64 *)&env->qregs[qreg - TARGET_NUM_QREGS];
  77     }
  78 }
  79
  80 void set_opf64(int qreg, float64 val)
  81 {
  82     if (qreg < TARGET_NUM_QREGS) {
  83         *(float64 *)(((long)env) + qreg_offsets[qreg]) = val;
  84     } else {
  85         *(float64 *)&env->qregs[qreg - TARGET_NUM_QREGS] = val;
  86     }
  87 }
  88
  89 #define OP(name) void OPPROTO glue(op_,name) (void)
  90
  91 OP(mov32)
  92 {
  93     set_op(PARAM1, get_op(PARAM2));
  94     FORCE_RET();
  95 }
  96
  97 OP(mov32_im)
  98 {
  99     set_op(PARAM1, PARAM2);
 100     FORCE_RET();
 101 }
 102
 103 OP(movf64)
 104 {
 105     set_opf64(PARAM1, get_opf64(PARAM2));
 106     FORCE_RET();
 107 }
 108
 109 OP(zerof64)
 110 {
 111     set_opf64(PARAM1, 0);
 112     FORCE_RET();
 113 }
 114
 115 OP(add32)
 116 {
 117     uint32_t op2 = get_op(PARAM2);
 118     uint32_t op3 = get_op(PARAM3);
 119     set_op(PARAM1, op2 + op3);
 120     FORCE_RET();
 121 }
 122
 123 OP(sub32)
 124 {
 125     uint32_t op2 = get_op(PARAM2);
 126     uint32_t op3 = get_op(PARAM3);
 127     set_op(PARAM1, op2 - op3);
 128     FORCE_RET();
 129 }
 130
 131 OP(mul32)
 132 {
 133     uint32_t op2 = get_op(PARAM2);
 134     uint32_t op3 = get_op(PARAM3);
 135     set_op(PARAM1, op2 * op3);
 136     FORCE_RET();
 137 }
 138
 139 OP(not32)
 140 {
 141     uint32_t arg = get_op(PARAM2);
 142     set_op(PARAM1, ~arg);
 143     FORCE_RET();
 144 }
 145
 146 OP(neg32)
 147 {
 148     uint32_t arg = get_op(PARAM2);
 149     set_op(PARAM1, -arg);
 150     FORCE_RET();
 151 }
 152
 153 OP(bswap32)
 154 {
 155     uint32_t arg = get_op(PARAM2);
 156     arg = (arg >> 24) | (arg << 24)
 157           | ((arg >> 16) & 0xff00) | ((arg << 16) & 0xff0000);
 158     set_op(PARAM1, arg);
 159     FORCE_RET();
 160 }
 161
 162 OP(btest)
 163 {
 164     uint32_t op1 = get_op(PARAM1);
 165     uint32_t op2 = get_op(PARAM2);
 166     if (op1 & op2)
 167         env->cc_dest &= ~CCF_Z;
 168     else
 169         env->cc_dest |= CCF_Z;
 170     FORCE_RET();
 171 }
 172
 173 OP(subx_cc)
 174 {
 175     uint32_t op1 = get_op(PARAM1);
 176     uint32_t op2 = get_op(PARAM2);
 177     uint32_t res;
 178     if (env->cc_x) {
 179         env->cc_x = (op1 <= op2);
 180         env->cc_op = CC_OP_SUBX;
 181         res = op1 - (op2 + 1);
 182     } else {
 183         env->cc_x = (op1 < op2);
 184         env->cc_op = CC_OP_SUB;
 185         res = op1 - op2;
 186     }
 187     set_op(PARAM1, res);
 188     FORCE_RET();
 189 }
 190
 191 OP(addx_cc)
 192 {
 193     uint32_t op1 = get_op(PARAM1);
 194     uint32_t op2 = get_op(PARAM2);
 195     uint32_t res;
 196     if (env->cc_x) {
 197         res = op1 + op2 + 1;
 198         env->cc_x = (res <= op2);
 199         env->cc_op = CC_OP_ADDX;
 200     } else {
 201         res = op1 + op2;
 202         env->cc_x = (res < op2);
 203         env->cc_op = CC_OP_ADD;
 204     }
 205     set_op(PARAM1, res);
 206     FORCE_RET();
 207 }
 208
 209 /* Logic ops.  */
 210
 211 OP(and32)
 212 {
 213     uint32_t op2 = get_op(PARAM2);
 214     uint32_t op3 = get_op(PARAM3);
 215     set_op(PARAM1, op2 & op3);
 216     FORCE_RET();
 217 }
 218
 219 OP(or32)
 220 {
 221     uint32_t op2 = get_op(PARAM2);
 222     uint32_t op3 = get_op(PARAM3);
 223     set_op(PARAM1, op2 | op3);
 224     FORCE_RET();
 225 }
 226
 227 OP(xor32)
 228 {
 229     uint32_t op2 = get_op(PARAM2);
 230     uint32_t op3 = get_op(PARAM3);
 231     set_op(PARAM1, op2 ^ op3);
 232     FORCE_RET();
 233 }
 234
 235 /* Shifts.  */
 236 OP(shl32)
 237 {
 238     uint32_t op2 = get_op(PARAM2);
 239     uint32_t op3 = get_op(PARAM3);
 240     uint32_t result;
 241     result = op2 << op3;
 242     set_op(PARAM1, result);
 243     FORCE_RET();
 244 }
 245
 246 OP(shl_cc)
 247 {
 248     uint32_t op1 = get_op(PARAM1);
 249     uint32_t op2 = get_op(PARAM2);
 250     uint32_t result;
 251     result = op1 << op2;
 252     set_op(PARAM1, result);
 253     env->cc_x = (op1 << (op2 - 1)) & 1;
 254     FORCE_RET();
 255 }
 256
 257 OP(shr32)
 258 {
 259     uint32_t op2 = get_op(PARAM2);
 260     uint32_t op3 = get_op(PARAM3);
 261     uint32_t result;
 262     result = op2 >> op3;
 263     set_op(PARAM1, result);
 264     FORCE_RET();
 265 }
 266
 267 OP(shr_cc)
 268 {
 269     uint32_t op1 = get_op(PARAM1);
 270     uint32_t op2 = get_op(PARAM2);
 271     uint32_t result;
 272     result = op1 >> op2;
 273     set_op(PARAM1, result);
 274     env->cc_x = (op1 >> (op2 - 1)) & 1;
 275     FORCE_RET();
 276 }
 277
 278 OP(sar_cc)
 279 {
 280     int32_t op1 = get_op(PARAM1);
 281     uint32_t op2 = get_op(PARAM2);
 282     uint32_t result;
 283     result = op1 >> op2;
 284     set_op(PARAM1, result);
 285     env->cc_x = (op1 >> (op2 - 1)) & 1;
 286     FORCE_RET();
 287 }
 288
 289 /* Value extend.  */
 290
 291 OP(ext8u32)
 292 {
 293     uint32_t op2 = get_op(PARAM2);
 294     set_op(PARAM1, (uint8_t)op2);
 295     FORCE_RET();
 296 }
 297
 298 OP(ext8s32)
 299 {
 300     uint32_t op2 = get_op(PARAM2);
 301     set_op(PARAM1, (int8_t)op2);
 302     FORCE_RET();
 303 }
 304
 305 OP(ext16u32)
 306 {
 307     uint32_t op2 = get_op(PARAM2);
 308     set_op(PARAM1, (uint16_t)op2);
 309     FORCE_RET();
 310 }
 311
 312 OP(ext16s32)
 313 {
 314     uint32_t op2 = get_op(PARAM2);
 315     set_op(PARAM1, (int16_t)op2);
 316     FORCE_RET();
 317 }
 318
 319 OP(flush_flags)
 320 {
 321     int cc_op  = PARAM1;
 322     if (cc_op == CC_OP_DYNAMIC)
 323         cc_op = env->cc_op;
 324     cpu_m68k_flush_flags(env, cc_op);
 325     FORCE_RET();
 326 }
 327
 328 OP(divu)
 329 {
 330     uint32_t num;
 331     uint32_t den;
 332     uint32_t quot;
 333     uint32_t rem;
 334     uint32_t flags;
 335
 336     num = env->div1;
 337     den = env->div2;
 338     /* ??? This needs to make sure the throwing location is accurate.  */
 339     if (den == 0)
 340         RAISE_EXCEPTION(EXCP_DIV0);
 341     quot = num / den;
 342     rem = num % den;
 343     flags = 0;
 344     /* Avoid using a PARAM1 of zero.  This breaks dyngen because it uses
 345        the address of a symbol, and gcc knows symbols can't have address
 346        zero.  */
 347     if (PARAM1 == 2 && quot > 0xffff)
 348         flags |= CCF_V;
 349     if (quot == 0)
 350         flags |= CCF_Z;
 351     else if ((int32_t)quot < 0)
 352         flags |= CCF_N;
 353     env->div1 = quot;
 354     env->div2 = rem;
 355     env->cc_dest = flags;
 356     FORCE_RET();
 357 }
 358
 359 OP(divs)
 360 {
 361     int32_t num;
 362     int32_t den;
 363     int32_t quot;
 364     int32_t rem;
 365     int32_t flags;
 366
 367     num = env->div1;
 368     den = env->div2;
 369     if (den == 0)
 370         RAISE_EXCEPTION(EXCP_DIV0);
 371     quot = num / den;
 372     rem = num % den;
 373     flags = 0;
 374     if (PARAM1 == 2 && quot != (int16_t)quot)
 375         flags |= CCF_V;
 376     if (quot == 0)
 377         flags |= CCF_Z;
 378     else if (quot < 0)
 379         flags |= CCF_N;
 380     env->div1 = quot;
 381     env->div2 = rem;
 382     env->cc_dest = flags;
 383     FORCE_RET();
 384 }
 385
 386 /* Halt is special because it may be a semihosting call.  */
 387 OP(halt)
 388 {
 389     RAISE_EXCEPTION(EXCP_HALT_INSN);
 390     FORCE_RET();
 391 }
 392
 393 OP(stop)
 394 {
 395     env->halted = 1;
 396     RAISE_EXCEPTION(EXCP_HLT);
 397     FORCE_RET();
 398 }
 399
 400 OP(raise_exception)
 401 {
 402     RAISE_EXCEPTION(PARAM1);
 403     FORCE_RET();
 404 }
 405
 406 /* Floating point comparison sets flags differently to other instructions.  */
 407
 408 OP(sub_cmpf64)
 409 {
 410     float64 src0;
 411     float64 src1;
 412     src0 = get_opf64(PARAM2);
 413     src1 = get_opf64(PARAM3);
 414     set_opf64(PARAM1, helper_sub_cmpf64(env, src0, src1));
 415     FORCE_RET();
 416 }
 417
 418 OP(update_xflag_tst)
 419 {
 420     uint32_t op1 = get_op(PARAM1);
 421     env->cc_x = op1;
 422     FORCE_RET();
 423 }
 424
 425 OP(update_xflag_lt)
 426 {
 427     uint32_t op1 = get_op(PARAM1);
 428     uint32_t op2 = get_op(PARAM2);
 429     env->cc_x = (op1 < op2);
 430     FORCE_RET();
 431 }
 432
 433 OP(get_xflag)
 434 {
 435     set_op(PARAM1, env->cc_x);
 436     FORCE_RET();
 437 }
 438
 439 OP(logic_cc)
 440 {
 441     uint32_t op1 = get_op(PARAM1);
 442     env->cc_dest = op1;
 443     FORCE_RET();
 444 }
 445
 446 OP(update_cc_add)
 447 {
 448     uint32_t op1 = get_op(PARAM1);
 449     uint32_t op2 = get_op(PARAM2);
 450     env->cc_dest = op1;
 451     env->cc_src = op2;
 452     FORCE_RET();
 453 }
 454
 455 OP(fp_result)
 456 {
 457     env->fp_result = get_opf64(PARAM1);
 458     FORCE_RET();
 459 }
 460
 461 OP(jmp)
 462 {
 463     GOTO_LABEL_PARAM(1);
 464 }
 465
 466 /* These ops involve a function call, which probably requires a stack frame
 467    and breaks things on some hosts.  */
 468 OP(jmp_z32)
 469 {
 470     uint32_t arg = get_op(PARAM1);
 471     if (arg == 0)
 472         GOTO_LABEL_PARAM(2);
 473     FORCE_RET();
 474 }
 475
 476 OP(jmp_nz32)
 477 {
 478     uint32_t arg = get_op(PARAM1);
 479     if (arg != 0)
 480         GOTO_LABEL_PARAM(2);
 481     FORCE_RET();
 482 }
 483
 484 OP(jmp_s32)
 485 {
 486     int32_t arg = get_op(PARAM1);
 487     if (arg < 0)
 488         GOTO_LABEL_PARAM(2);
 489     FORCE_RET();
 490 }
 491
 492 OP(jmp_ns32)
 493 {
 494     int32_t arg = get_op(PARAM1);
 495     if (arg >= 0)
 496         GOTO_LABEL_PARAM(2);
 497     FORCE_RET();
 498 }
 499
 500 void OPPROTO op_goto_tb0(void)
 501 {
 502     GOTO_TB(op_goto_tb0, PARAM1, 0);
 503 }
 504
 505 void OPPROTO op_goto_tb1(void)
 506 {
 507     GOTO_TB(op_goto_tb1, PARAM1, 1);
 508 }
 509
 510 OP(exit_tb)
 511 {
 512     EXIT_TB();
 513 }
 514
 515
 516 /* Floating point.  */
 517 OP(f64_to_i32)
 518 {
 519     set_op(PARAM1, float64_to_int32(get_opf64(PARAM2), &CPU_FP_STATUS));
 520     FORCE_RET();
 521 }
 522
 523 OP(f64_to_f32)
 524 {
 525     union {
 526         float32 f;
 527         uint32_t i;
 528     } u;
 529     u.f = float64_to_float32(get_opf64(PARAM2), &CPU_FP_STATUS);
 530     set_op(PARAM1, u.i);
 531     FORCE_RET();
 532 }
 533
 534 OP(i32_to_f64)
 535 {
 536     set_opf64(PARAM1, int32_to_float64(get_op(PARAM2), &CPU_FP_STATUS));
 537     FORCE_RET();
 538 }
 539
 540 OP(f32_to_f64)
 541 {
 542     union {
 543         float32 f;
 544         uint32_t i;
 545     } u;
 546     u.i = get_op(PARAM2);
 547     set_opf64(PARAM1, float32_to_float64(u.f, &CPU_FP_STATUS));
 548     FORCE_RET();
 549 }
 550
 551 OP(absf64)
 552 {
 553     float64 op0 = get_opf64(PARAM2);
 554     set_opf64(PARAM1, float64_abs(op0));
 555     FORCE_RET();
 556 }
 557
 558 OP(chsf64)
 559 {
 560     float64 op0 = get_opf64(PARAM2);
 561     set_opf64(PARAM1, float64_chs(op0));
 562     FORCE_RET();
 563 }
 564
 565 OP(sqrtf64)
 566 {
 567     float64 op0 = get_opf64(PARAM2);
 568     set_opf64(PARAM1, float64_sqrt(op0, &CPU_FP_STATUS));
 569     FORCE_RET();
 570 }
 571
 572 OP(addf64)
 573 {
 574     float64 op0 = get_opf64(PARAM2);
 575     float64 op1 = get_opf64(PARAM3);
 576     set_opf64(PARAM1, float64_add(op0, op1, &CPU_FP_STATUS));
 577     FORCE_RET();
 578 }
 579
 580 OP(subf64)
 581 {
 582     float64 op0 = get_opf64(PARAM2);
 583     float64 op1 = get_opf64(PARAM3);
 584     set_opf64(PARAM1, float64_sub(op0, op1, &CPU_FP_STATUS));
 585     FORCE_RET();
 586 }
 587
 588 OP(mulf64)
 589 {
 590     float64 op0 = get_opf64(PARAM2);
 591     float64 op1 = get_opf64(PARAM3);
 592     set_opf64(PARAM1, float64_mul(op0, op1, &CPU_FP_STATUS));
 593     FORCE_RET();
 594 }
 595
 596 OP(divf64)
 597 {
 598     float64 op0 = get_opf64(PARAM2);
 599     float64 op1 = get_opf64(PARAM3);
 600     set_opf64(PARAM1, float64_div(op0, op1, &CPU_FP_STATUS));
 601     FORCE_RET();
 602 }
 603
 604 OP(iround_f64)
 605 {
 606     float64 op0 = get_opf64(PARAM2);
 607     set_opf64(PARAM1, float64_round_to_int(op0, &CPU_FP_STATUS));
 608     FORCE_RET();
 609 }
 610
 611 OP(itrunc_f64)
 612 {
 613     float64 op0 = get_opf64(PARAM2);
 614     set_opf64(PARAM1, float64_trunc_to_int(op0, &CPU_FP_STATUS));
 615     FORCE_RET();
 616 }
 617
 618 OP(compare_quietf64)
 619 {
 620     float64 op0 = get_opf64(PARAM2);
 621     float64 op1 = get_opf64(PARAM3);
 622     set_op(PARAM1, float64_compare_quiet(op0, op1, &CPU_FP_STATUS));
 623     FORCE_RET();
 624 }
 625
 626 OP(movec)
 627 {
 628     int op1 = get_op(PARAM1);
 629     uint32_t op2 = get_op(PARAM2);
 630     helper_movec(env, op1, op2);
 631 }
 632
 633 /* Memory access.  */
 634
 635 #define MEMSUFFIX _raw
 636 #include "op_mem.h"
 637
 638 #if !defined(CONFIG_USER_ONLY)
 639 #define MEMSUFFIX _user
 640 #include "op_mem.h"
 641 #define MEMSUFFIX _kernel
 642 #include "op_mem.h"
 643 #endif