target-cris/op_helper.c

   1 /*
   2  *  CRIS helper routines
   3  *
   4  *  Copyright (c) 2007 AXIS Communications
   5  *  Written by Edgar E. Iglesias
   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  * Lesser 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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "cpu.h"
  22 #include "dyngen-exec.h"
  23 #include "mmu.h"
  24 #include "helper.h"
  25 #include "host-utils.h"
  26
  27 //#define CRIS_OP_HELPER_DEBUG
  28
  29
  30 #ifdef CRIS_OP_HELPER_DEBUG
  31 #define D(x) x
  32 #define D_LOG(...) qemu_log(__VA__ARGS__)
  33 #else
  34 #define D(x)
  35 #define D_LOG(...) do { } while (0)
  36 #endif
  37
  38 #if !defined(CONFIG_USER_ONLY)
  39 #include "softmmu_exec.h"
  40
  41 #define MMUSUFFIX _mmu
  42
  43 #define SHIFT 0
  44 #include "softmmu_template.h"
  45
  46 #define SHIFT 1
  47 #include "softmmu_template.h"
  48
  49 #define SHIFT 2
  50 #include "softmmu_template.h"
  51
  52 #define SHIFT 3
  53 #include "softmmu_template.h"
  54
  55 /* Try to fill the TLB and return an exception if error. If retaddr is
  56    NULL, it means that the function was called in C code (i.e. not
  57    from generated code or from helper.c) */
  58 /* XXX: fix it to restore all registers */
  59 void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
  60 {
  61     TranslationBlock *tb;
  62     CPUState *saved_env;
  63     unsigned long pc;
  64     int ret;
  65
  66     /* XXX: hack to restore env in all cases, even if not called from
  67        generated code */
  68     saved_env = env;
  69     env = cpu_single_env;
  70
  71     D_LOG("%s pc=%x tpc=%x ra=%x\n", __func__,
  72              env->pc, env->debug1, retaddr);
  73     ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx);
  74     if (unlikely(ret)) {
  75         if (retaddr) {
  76             /* now we have a real cpu fault */
  77             pc = (unsigned long)retaddr;
  78             tb = tb_find_pc(pc);
  79             if (tb) {
  80                 /* the PC is inside the translated code. It means that we have
  81                    a virtual CPU fault */
  82                 cpu_restore_state(tb, env, pc);
  83
  84                 /* Evaluate flags after retranslation.  */
  85                 helper_top_evaluate_flags();
  86             }
  87         }
  88         cpu_loop_exit(env);
  89     }
  90     env = saved_env;
  91 }
  92
  93 #endif
  94
  95 void helper_raise_exception(uint32_t index)
  96 {
  97         env->exception_index = index;
  98         cpu_loop_exit(env);
  99 }
 100
 101 void helper_tlb_flush_pid(uint32_t pid)
 102 {
 103 #if !defined(CONFIG_USER_ONLY)
 104         pid &= 0xff;
 105         if (pid != (env->pregs[PR_PID] & 0xff))
 106                 cris_mmu_flush_pid(env, env->pregs[PR_PID]);
 107 #endif
 108 }
 109
 110 void helper_spc_write(uint32_t new_spc)
 111 {
 112 #if !defined(CONFIG_USER_ONLY)
 113         tlb_flush_page(env, env->pregs[PR_SPC]);
 114         tlb_flush_page(env, new_spc);
 115 #endif
 116 }
 117
 118 void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
 119 {
 120         qemu_log("%s: a0=%x a1=%x\n", __func__, a0, a1);
 121 }
 122
 123 /* Used by the tlb decoder.  */
 124 #define EXTRACT_FIELD(src, start, end) \
 125             (((src) >> start) & ((1 << (end - start + 1)) - 1))
 126
 127 void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
 128 {
 129         uint32_t srs;
 130         srs = env->pregs[PR_SRS];
 131         srs &= 3;
 132         env->sregs[srs][sreg] = env->regs[reg];
 133
 134 #if !defined(CONFIG_USER_ONLY)
 135         if (srs == 1 || srs == 2) {
 136                 if (sreg == 6) {
 137                         /* Writes to tlb-hi write to mm_cause as a side
 138                            effect.  */
 139                         env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
 140                         env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
 141                 }
 142                 else if (sreg == 5) {
 143                         uint32_t set;
 144                         uint32_t idx;
 145                         uint32_t lo, hi;
 146                         uint32_t vaddr;
 147                         int tlb_v;
 148
 149                         idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 150                         set >>= 4;
 151                         set &= 3;
 152
 153                         idx &= 15;
 154                         /* We've just made a write to tlb_lo.  */
 155                         lo = env->sregs[SFR_RW_MM_TLB_LO];
 156                         /* Writes are done via r_mm_cause.  */
 157                         hi = env->sregs[SFR_R_MM_CAUSE];
 158
 159                         vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
 160                                               13, 31);
 161                         vaddr <<= TARGET_PAGE_BITS;
 162                         tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
 163                                             3, 3);
 164                         env->tlbsets[srs - 1][set][idx].lo = lo;
 165                         env->tlbsets[srs - 1][set][idx].hi = hi;
 166
 167                         D_LOG("tlb flush vaddr=%x v=%d pc=%x\n",
 168                                   vaddr, tlb_v, env->pc);
 169                         if (tlb_v) {
 170                                 tlb_flush_page(env, vaddr);
 171                         }
 172                 }
 173         }
 174 #endif
 175 }
 176
 177 void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
 178 {
 179         uint32_t srs;
 180         env->pregs[PR_SRS] &= 3;
 181         srs = env->pregs[PR_SRS];
 182
 183 #if !defined(CONFIG_USER_ONLY)
 184         if (srs == 1 || srs == 2)
 185         {
 186                 uint32_t set;
 187                 uint32_t idx;
 188                 uint32_t lo, hi;
 189
 190                 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 191                 set >>= 4;
 192                 set &= 3;
 193                 idx &= 15;
 194
 195                 /* Update the mirror regs.  */
 196                 hi = env->tlbsets[srs - 1][set][idx].hi;
 197                 lo = env->tlbsets[srs - 1][set][idx].lo;
 198                 env->sregs[SFR_RW_MM_TLB_HI] = hi;
 199                 env->sregs[SFR_RW_MM_TLB_LO] = lo;
 200         }
 201 #endif
 202         env->regs[reg] = env->sregs[srs][sreg];
 203 }
 204
 205 static void cris_ccs_rshift(CPUState *env)
 206 {
 207         uint32_t ccs;
 208
 209         /* Apply the ccs shift.  */
 210         ccs = env->pregs[PR_CCS];
 211         ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
 212         if (ccs & U_FLAG)
 213         {
 214                 /* Enter user mode.  */
 215                 env->ksp = env->regs[R_SP];
 216                 env->regs[R_SP] = env->pregs[PR_USP];
 217         }
 218
 219         env->pregs[PR_CCS] = ccs;
 220 }
 221
 222 void helper_rfe(void)
 223 {
 224         int rflag = env->pregs[PR_CCS] & R_FLAG;
 225
 226         D_LOG("rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
 227                  env->pregs[PR_ERP], env->pregs[PR_PID],
 228                  env->pregs[PR_CCS],
 229                  env->btarget);
 230
 231         cris_ccs_rshift(env);
 232
 233         /* RFE sets the P_FLAG only if the R_FLAG is not set.  */
 234         if (!rflag)
 235                 env->pregs[PR_CCS] |= P_FLAG;
 236 }
 237
 238 void helper_rfn(void)
 239 {
 240         int rflag = env->pregs[PR_CCS] & R_FLAG;
 241
 242         D_LOG("rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
 243                  env->pregs[PR_ERP], env->pregs[PR_PID],
 244                  env->pregs[PR_CCS],
 245                  env->btarget);
 246
 247         cris_ccs_rshift(env);
 248
 249         /* Set the P_FLAG only if the R_FLAG is not set.  */
 250         if (!rflag)
 251                 env->pregs[PR_CCS] |= P_FLAG;
 252
 253     /* Always set the M flag.  */
 254     env->pregs[PR_CCS] |= M_FLAG;
 255 }
 256
 257 uint32_t helper_lz(uint32_t t0)
 258 {
 259         return clz32(t0);
 260 }
 261
 262 uint32_t helper_btst(uint32_t t0, uint32_t t1, uint32_t ccs)
 263 {
 264         /* FIXME: clean this up.  */
 265
 266         /* des ref:
 267            The N flag is set according to the selected bit in the dest reg.
 268            The Z flag is set if the selected bit and all bits to the right are
 269            zero.
 270            The X flag is cleared.
 271            Other flags are left untouched.
 272            The destination reg is not affected.*/
 273         unsigned int fz, sbit, bset, mask, masked_t0;
 274
 275         sbit = t1 & 31;
 276         bset = !!(t0 & (1 << sbit));
 277         mask = sbit == 31 ? -1 : (1 << (sbit + 1)) - 1;
 278         masked_t0 = t0 & mask;
 279         fz = !(masked_t0 | bset);
 280
 281         /* Clear the X, N and Z flags.  */
 282         ccs = ccs & ~(X_FLAG | N_FLAG | Z_FLAG);
 283         if (env->pregs[PR_VR] < 32)
 284                 ccs &= ~(V_FLAG | C_FLAG);
 285         /* Set the N and Z flags accordingly.  */
 286         ccs |= (bset << 3) | (fz << 2);
 287         return ccs;
 288 }
 289
 290 static inline uint32_t evaluate_flags_writeback(uint32_t flags, uint32_t ccs)
 291 {
 292         unsigned int x, z, mask;
 293
 294         /* Extended arithmetics, leave the z flag alone.  */
 295         x = env->cc_x;
 296         mask = env->cc_mask | X_FLAG;
 297         if (x) {
 298                 z = flags & Z_FLAG;
 299                 mask = mask & ~z;
 300         }
 301         flags &= mask;
 302
 303         /* all insn clear the x-flag except setf or clrf.  */
 304         ccs &= ~mask;
 305         ccs |= flags;
 306         return ccs;
 307 }
 308
 309 uint32_t helper_evaluate_flags_muls(uint32_t ccs, uint32_t res, uint32_t mof)
 310 {
 311         uint32_t flags = 0;
 312         int64_t tmp;
 313         int dneg;
 314
 315         dneg = ((int32_t)res) < 0;
 316
 317         tmp = mof;
 318         tmp <<= 32;
 319         tmp |= res;
 320         if (tmp == 0)
 321                 flags |= Z_FLAG;
 322         else if (tmp < 0)
 323                 flags |= N_FLAG;
 324         if ((dneg && mof != -1)
 325             || (!dneg && mof != 0))
 326                 flags |= V_FLAG;
 327         return evaluate_flags_writeback(flags, ccs);
 328 }
 329
 330 uint32_t helper_evaluate_flags_mulu(uint32_t ccs, uint32_t res, uint32_t mof)
 331 {
 332         uint32_t flags = 0;
 333         uint64_t tmp;
 334
 335         tmp = mof;
 336         tmp <<= 32;
 337         tmp |= res;
 338         if (tmp == 0)
 339                 flags |= Z_FLAG;
 340         else if (tmp >> 63)
 341                 flags |= N_FLAG;
 342         if (mof)
 343                 flags |= V_FLAG;
 344
 345         return evaluate_flags_writeback(flags, ccs);
 346 }
 347
 348 uint32_t helper_evaluate_flags_mcp(uint32_t ccs,
 349                                    uint32_t src, uint32_t dst, uint32_t res)
 350 {
 351         uint32_t flags = 0;
 352
 353         src = src & 0x80000000;
 354         dst = dst & 0x80000000;
 355
 356         if ((res & 0x80000000L) != 0L)
 357         {
 358                 flags |= N_FLAG;
 359                 if (!src && !dst)
 360                         flags |= V_FLAG;
 361                 else if (src & dst)
 362                         flags |= R_FLAG;
 363         }
 364         else
 365         {
 366                 if (res == 0L)
 367                         flags |= Z_FLAG;
 368                 if (src & dst)
 369                         flags |= V_FLAG;
 370                 if (dst | src)
 371                         flags |= R_FLAG;
 372         }
 373
 374         return evaluate_flags_writeback(flags, ccs);
 375 }
 376
 377 uint32_t helper_evaluate_flags_alu_4(uint32_t ccs,
 378                                      uint32_t src, uint32_t dst, uint32_t res)
 379 {
 380         uint32_t flags = 0;
 381
 382         src = src & 0x80000000;
 383         dst = dst & 0x80000000;
 384
 385         if ((res & 0x80000000L) != 0L)
 386         {
 387                 flags |= N_FLAG;
 388                 if (!src && !dst)
 389                         flags |= V_FLAG;
 390                 else if (src & dst)
 391                         flags |= C_FLAG;
 392         }
 393         else
 394         {
 395                 if (res == 0L)
 396                         flags |= Z_FLAG;
 397                 if (src & dst)
 398                         flags |= V_FLAG;
 399                 if (dst | src)
 400                         flags |= C_FLAG;
 401         }
 402
 403         return evaluate_flags_writeback(flags, ccs);
 404 }
 405
 406 uint32_t helper_evaluate_flags_sub_4(uint32_t ccs,
 407                                      uint32_t src, uint32_t dst, uint32_t res)
 408 {
 409         uint32_t flags = 0;
 410
 411         src = (~src) & 0x80000000;
 412         dst = dst & 0x80000000;
 413
 414         if ((res & 0x80000000L) != 0L)
 415         {
 416                 flags |= N_FLAG;
 417                 if (!src && !dst)
 418                         flags |= V_FLAG;
 419                 else if (src & dst)
 420                         flags |= C_FLAG;
 421         }
 422         else
 423         {
 424                 if (res == 0L)
 425                         flags |= Z_FLAG;
 426                 if (src & dst)
 427                         flags |= V_FLAG;
 428                 if (dst | src)
 429                         flags |= C_FLAG;
 430         }
 431
 432         flags ^= C_FLAG;
 433         return evaluate_flags_writeback(flags, ccs);
 434 }
 435
 436 uint32_t helper_evaluate_flags_move_4(uint32_t ccs, uint32_t res)
 437 {
 438         uint32_t flags = 0;
 439
 440         if ((int32_t)res < 0)
 441                 flags |= N_FLAG;
 442         else if (res == 0L)
 443                 flags |= Z_FLAG;
 444
 445         return evaluate_flags_writeback(flags, ccs);
 446 }
 447 uint32_t helper_evaluate_flags_move_2(uint32_t ccs, uint32_t res)
 448 {
 449         uint32_t flags = 0;
 450
 451         if ((int16_t)res < 0L)
 452                 flags |= N_FLAG;
 453         else if (res == 0)
 454                 flags |= Z_FLAG;
 455
 456         return evaluate_flags_writeback(flags, ccs);
 457 }
 458
 459 /* TODO: This is expensive. We could split things up and only evaluate part of
 460    CCR on a need to know basis. For now, we simply re-evaluate everything.  */
 461 void  helper_evaluate_flags(void)
 462 {
 463         uint32_t src, dst, res;
 464         uint32_t flags = 0;
 465
 466         src = env->cc_src;
 467         dst = env->cc_dest;
 468         res = env->cc_result;
 469
 470         if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 471                 src = ~src;
 472
 473         /* Now, evaluate the flags. This stuff is based on
 474            Per Zander's CRISv10 simulator.  */
 475         switch (env->cc_size)
 476         {
 477                 case 1:
 478                         if ((res & 0x80L) != 0L)
 479                         {
 480                                 flags |= N_FLAG;
 481                                 if (((src & 0x80L) == 0L)
 482                                     && ((dst & 0x80L) == 0L))
 483                                 {
 484                                         flags |= V_FLAG;
 485                                 }
 486                                 else if (((src & 0x80L) != 0L)
 487                                          && ((dst & 0x80L) != 0L))
 488                                 {
 489                                         flags |= C_FLAG;
 490                                 }
 491                         }
 492                         else
 493                         {
 494                                 if ((res & 0xFFL) == 0L)
 495                                 {
 496                                         flags |= Z_FLAG;
 497                                 }
 498                                 if (((src & 0x80L) != 0L)
 499                                     && ((dst & 0x80L) != 0L))
 500                                 {
 501                                         flags |= V_FLAG;
 502                                 }
 503                                 if ((dst & 0x80L) != 0L
 504                                     || (src & 0x80L) != 0L)
 505                                 {
 506                                         flags |= C_FLAG;
 507                                 }
 508                         }
 509                         break;
 510                 case 2:
 511                         if ((res & 0x8000L) != 0L)
 512                         {
 513                                 flags |= N_FLAG;
 514                                 if (((src & 0x8000L) == 0L)
 515                                     && ((dst & 0x8000L) == 0L))
 516                                 {
 517                                         flags |= V_FLAG;
 518                                 }
 519                                 else if (((src & 0x8000L) != 0L)
 520                                          && ((dst & 0x8000L) != 0L))
 521                                 {
 522                                         flags |= C_FLAG;
 523                                 }
 524                         }
 525                         else
 526                         {
 527                                 if ((res & 0xFFFFL) == 0L)
 528                                 {
 529                                         flags |= Z_FLAG;
 530                                 }
 531                                 if (((src & 0x8000L) != 0L)
 532                                     && ((dst & 0x8000L) != 0L))
 533                                 {
 534                                         flags |= V_FLAG;
 535                                 }
 536                                 if ((dst & 0x8000L) != 0L
 537                                     || (src & 0x8000L) != 0L)
 538                                 {
 539                                         flags |= C_FLAG;
 540                                 }
 541                         }
 542                         break;
 543                 case 4:
 544                         if ((res & 0x80000000L) != 0L)
 545                         {
 546                                 flags |= N_FLAG;
 547                                 if (((src & 0x80000000L) == 0L)
 548                                     && ((dst & 0x80000000L) == 0L))
 549                                 {
 550                                         flags |= V_FLAG;
 551                                 }
 552                                 else if (((src & 0x80000000L) != 0L) &&
 553                                          ((dst & 0x80000000L) != 0L))
 554                                 {
 555                                         flags |= C_FLAG;
 556                                 }
 557                         }
 558                         else
 559                         {
 560                                 if (res == 0L)
 561                                         flags |= Z_FLAG;
 562                                 if (((src & 0x80000000L) != 0L)
 563                                     && ((dst & 0x80000000L) != 0L))
 564                                         flags |= V_FLAG;
 565                                 if ((dst & 0x80000000L) != 0L
 566                                     || (src & 0x80000000L) != 0L)
 567                                         flags |= C_FLAG;
 568                         }
 569                         break;
 570                 default:
 571                         break;
 572         }
 573
 574         if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 575                 flags ^= C_FLAG;
 576
 577         env->pregs[PR_CCS] = evaluate_flags_writeback(flags, env->pregs[PR_CCS]);
 578 }
 579
 580 void helper_top_evaluate_flags(void)
 581 {
 582         switch (env->cc_op)
 583         {
 584                 case CC_OP_MCP:
 585                         env->pregs[PR_CCS] = helper_evaluate_flags_mcp(
 586                                         env->pregs[PR_CCS], env->cc_src,
 587                                         env->cc_dest, env->cc_result);
 588                         break;
 589                 case CC_OP_MULS:
 590                         env->pregs[PR_CCS] = helper_evaluate_flags_muls(
 591                                         env->pregs[PR_CCS], env->cc_result,
 592                                         env->pregs[PR_MOF]);
 593                         break;
 594                 case CC_OP_MULU:
 595                         env->pregs[PR_CCS] = helper_evaluate_flags_mulu(
 596                                         env->pregs[PR_CCS], env->cc_result,
 597                                         env->pregs[PR_MOF]);
 598                         break;
 599                 case CC_OP_MOVE:
 600                 case CC_OP_AND:
 601                 case CC_OP_OR:
 602                 case CC_OP_XOR:
 603                 case CC_OP_ASR:
 604                 case CC_OP_LSR:
 605                 case CC_OP_LSL:
 606                 switch (env->cc_size)
 607                 {
 608                         case 4:
 609                                 env->pregs[PR_CCS] =
 610                                         helper_evaluate_flags_move_4(
 611                                                         env->pregs[PR_CCS],
 612                                                         env->cc_result);
 613                                 break;
 614                         case 2:
 615                                 env->pregs[PR_CCS] =
 616                                         helper_evaluate_flags_move_2(
 617                                                         env->pregs[PR_CCS],
 618                                                         env->cc_result);
 619                                 break;
 620                         default:
 621                                 helper_evaluate_flags();
 622                                 break;
 623                 }
 624                 break;
 625                 case CC_OP_FLAGS:
 626                         /* live.  */
 627                         break;
 628                 case CC_OP_SUB:
 629                 case CC_OP_CMP:
 630                         if (env->cc_size == 4)
 631                                 env->pregs[PR_CCS] =
 632                                         helper_evaluate_flags_sub_4(
 633                                                 env->pregs[PR_CCS],
 634                                                 env->cc_src, env->cc_dest,
 635                                                 env->cc_result);
 636                         else
 637                                 helper_evaluate_flags();
 638                         break;
 639                 default:
 640                 {
 641                         switch (env->cc_size)
 642                         {
 643                         case 4:
 644                                 env->pregs[PR_CCS] =
 645                                         helper_evaluate_flags_alu_4(
 646                                                 env->pregs[PR_CCS],
 647                                                 env->cc_src, env->cc_dest,
 648                                                 env->cc_result);
 649                                 break;
 650                         default:
 651                                 helper_evaluate_flags();
 652                                 break;
 653                         }
 654                 }
 655                 break;
 656         }
 657 }