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, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <assert.h>
  23 #include "exec.h"
  24 #include "mmu.h"
  25 #include "helper.h"
  26
  27 #define D(x)
  28
  29 #if !defined(CONFIG_USER_ONLY)
  30
  31 #define MMUSUFFIX _mmu
  32
  33 #define SHIFT 0
  34 #include "softmmu_template.h"
  35
  36 #define SHIFT 1
  37 #include "softmmu_template.h"
  38
  39 #define SHIFT 2
  40 #include "softmmu_template.h"
  41
  42 #define SHIFT 3
  43 #include "softmmu_template.h"
  44
  45 /* Try to fill the TLB and return an exception if error. If retaddr is
  46    NULL, it means that the function was called in C code (i.e. not
  47    from generated code or from helper.c) */
  48 /* XXX: fix it to restore all registers */
  49 void tlb_fill (target_ulong addr, int is_write, int mmu_idx, void *retaddr)
  50 {
  51     TranslationBlock *tb;
  52     CPUState *saved_env;
  53     unsigned long pc;
  54     int ret;
  55
  56     /* XXX: hack to restore env in all cases, even if not called from
  57        generated code */
  58     saved_env = env;
  59     env = cpu_single_env;
  60
  61     D(fprintf(logfile, "%s pc=%x tpc=%x ra=%x\n", __func__,
  62              env->pc, env->debug1, retaddr));
  63     ret = cpu_cris_handle_mmu_fault(env, addr, is_write, mmu_idx, 1);
  64     if (unlikely(ret)) {
  65         if (retaddr) {
  66             /* now we have a real cpu fault */
  67             pc = (unsigned long)retaddr;
  68             tb = tb_find_pc(pc);
  69             if (tb) {
  70                 /* the PC is inside the translated code. It means that we have
  71                    a virtual CPU fault */
  72                 cpu_restore_state(tb, env, pc, NULL);
  73
  74                 /* Evaluate flags after retranslation.  */
  75                 helper_top_evaluate_flags();
  76             }
  77         }
  78         cpu_loop_exit();
  79     }
  80     env = saved_env;
  81 }
  82
  83 #endif
  84
  85 void helper_raise_exception(uint32_t index)
  86 {
  87         env->exception_index = index;
  88         cpu_loop_exit();
  89 }
  90
  91 void helper_tlb_flush_pid(uint32_t pid)
  92 {
  93 #if !defined(CONFIG_USER_ONLY)
  94         pid &= 0xff;
  95         if (pid != (env->pregs[PR_PID] & 0xff))
  96                 cris_mmu_flush_pid(env, env->pregs[PR_PID]);
  97 #endif
  98 }
  99
 100 void helper_spc_write(uint32_t new_spc)
 101 {
 102 #if !defined(CONFIG_USER_ONLY)
 103         tlb_flush_page(env, env->pregs[PR_SPC]);
 104         tlb_flush_page(env, new_spc);
 105 #endif
 106 }
 107
 108 void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
 109 {
 110         (fprintf(logfile, "%s: a0=%x a1=%x\n", __func__, a0, a1));
 111 }
 112
 113 /* Used by the tlb decoder.  */
 114 #define EXTRACT_FIELD(src, start, end) \
 115             (((src) >> start) & ((1 << (end - start + 1)) - 1))
 116
 117 void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
 118 {
 119         uint32_t srs;
 120         srs = env->pregs[PR_SRS];
 121         srs &= 3;
 122         env->sregs[srs][sreg] = env->regs[reg];
 123
 124 #if !defined(CONFIG_USER_ONLY)
 125         if (srs == 1 || srs == 2) {
 126                 if (sreg == 6) {
 127                         /* Writes to tlb-hi write to mm_cause as a side
 128                            effect.  */
 129                         env->sregs[SFR_RW_MM_TLB_HI] = env->regs[reg];
 130                         env->sregs[SFR_R_MM_CAUSE] = env->regs[reg];
 131                 }
 132                 else if (sreg == 5) {
 133                         uint32_t set;
 134                         uint32_t idx;
 135                         uint32_t lo, hi;
 136                         uint32_t vaddr;
 137                         int tlb_v;
 138
 139                         idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 140                         set >>= 4;
 141                         set &= 3;
 142
 143                         idx &= 15;
 144                         /* We've just made a write to tlb_lo.  */
 145                         lo = env->sregs[SFR_RW_MM_TLB_LO];
 146                         /* Writes are done via r_mm_cause.  */
 147                         hi = env->sregs[SFR_R_MM_CAUSE];
 148
 149                         vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
 150                                               13, 31);
 151                         vaddr <<= TARGET_PAGE_BITS;
 152                         tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
 153                                             3, 3);
 154                         env->tlbsets[srs - 1][set][idx].lo = lo;
 155                         env->tlbsets[srs - 1][set][idx].hi = hi;
 156
 157                         D(fprintf(logfile,
 158                                   "tlb flush vaddr=%x v=%d pc=%x\n",
 159                                   vaddr, tlb_v, env->pc));
 160                         tlb_flush_page(env, vaddr);
 161                 }
 162         }
 163 #endif
 164 }
 165
 166 void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
 167 {
 168         uint32_t srs;
 169         env->pregs[PR_SRS] &= 3;
 170         srs = env->pregs[PR_SRS];
 171
 172 #if !defined(CONFIG_USER_ONLY)
 173         if (srs == 1 || srs == 2)
 174         {
 175                 uint32_t set;
 176                 uint32_t idx;
 177                 uint32_t lo, hi;
 178
 179                 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 180                 set >>= 4;
 181                 set &= 3;
 182                 idx &= 15;
 183
 184                 /* Update the mirror regs.  */
 185                 hi = env->tlbsets[srs - 1][set][idx].hi;
 186                 lo = env->tlbsets[srs - 1][set][idx].lo;
 187                 env->sregs[SFR_RW_MM_TLB_HI] = hi;
 188                 env->sregs[SFR_RW_MM_TLB_LO] = lo;
 189         }
 190 #endif
 191         env->regs[reg] = env->sregs[srs][sreg];
 192 }
 193
 194 static void cris_ccs_rshift(CPUState *env)
 195 {
 196         uint32_t ccs;
 197
 198         /* Apply the ccs shift.  */
 199         ccs = env->pregs[PR_CCS];
 200         ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
 201         if (ccs & U_FLAG)
 202         {
 203                 /* Enter user mode.  */
 204                 env->ksp = env->regs[R_SP];
 205                 env->regs[R_SP] = env->pregs[PR_USP];
 206         }
 207
 208         env->pregs[PR_CCS] = ccs;
 209 }
 210
 211 void helper_rfe(void)
 212 {
 213         int rflag = env->pregs[PR_CCS] & R_FLAG;
 214
 215         D(fprintf(logfile, "rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
 216                  env->pregs[PR_ERP], env->pregs[PR_PID],
 217                  env->pregs[PR_CCS],
 218                  env->btarget));
 219
 220         cris_ccs_rshift(env);
 221
 222         /* RFE sets the P_FLAG only if the R_FLAG is not set.  */
 223         if (!rflag)
 224                 env->pregs[PR_CCS] |= P_FLAG;
 225 }
 226
 227 void helper_rfn(void)
 228 {
 229         int rflag = env->pregs[PR_CCS] & R_FLAG;
 230
 231         D(fprintf(logfile, "rfn: erp=%x pid=%x ccs=%x btarget=%x\n",
 232                  env->pregs[PR_ERP], env->pregs[PR_PID],
 233                  env->pregs[PR_CCS],
 234                  env->btarget));
 235
 236         cris_ccs_rshift(env);
 237
 238         /* Set the P_FLAG only if the R_FLAG is not set.  */
 239         if (!rflag)
 240                 env->pregs[PR_CCS] |= P_FLAG;
 241
 242     /* Always set the M flag.  */
 243     env->pregs[PR_CCS] |= M_FLAG;
 244 }
 245
 246 void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
 247                           int is_asi, int size)
 248 {
 249         D(printf("%s addr=%x w=%d ex=%d asi=%d, size=%d\n",
 250                 __func__, addr, is_write, is_exec, is_asi, size));
 251 }
 252
 253 static void evaluate_flags_writeback(uint32_t flags)
 254 {
 255         int x;
 256
 257         /* Extended arithmetics, leave the z flag alone.  */
 258         x = env->cc_x;
 259         if ((x || env->cc_op == CC_OP_ADDC)
 260             && flags & Z_FLAG)
 261                 env->cc_mask &= ~Z_FLAG;
 262
 263         /* all insn clear the x-flag except setf or clrf.  */
 264         env->pregs[PR_CCS] &= ~(env->cc_mask | X_FLAG);
 265         flags &= env->cc_mask;
 266         env->pregs[PR_CCS] |= flags;
 267 }
 268
 269 void helper_evaluate_flags_muls(void)
 270 {
 271         uint32_t src;
 272         uint32_t dst;
 273         uint32_t res;
 274         uint32_t flags = 0;
 275         int64_t tmp;
 276         int32_t mof;
 277         int dneg;
 278
 279         src = env->cc_src;
 280         dst = env->cc_dest;
 281         res = env->cc_result;
 282
 283         dneg = ((int32_t)res) < 0;
 284
 285         mof = env->pregs[PR_MOF];
 286         tmp = mof;
 287         tmp <<= 32;
 288         tmp |= res;
 289         if (tmp == 0)
 290                 flags |= Z_FLAG;
 291         else if (tmp < 0)
 292                 flags |= N_FLAG;
 293         if ((dneg && mof != -1)
 294             || (!dneg && mof != 0))
 295                 flags |= V_FLAG;
 296         evaluate_flags_writeback(flags);
 297 }
 298
 299 void  helper_evaluate_flags_mulu(void)
 300 {
 301         uint32_t src;
 302         uint32_t dst;
 303         uint32_t res;
 304         uint32_t flags = 0;
 305         uint64_t tmp;
 306         uint32_t mof;
 307
 308         src = env->cc_src;
 309         dst = env->cc_dest;
 310         res = env->cc_result;
 311
 312         mof = env->pregs[PR_MOF];
 313         tmp = mof;
 314         tmp <<= 32;
 315         tmp |= res;
 316         if (tmp == 0)
 317                 flags |= Z_FLAG;
 318         else if (tmp >> 63)
 319                 flags |= N_FLAG;
 320         if (mof)
 321                 flags |= V_FLAG;
 322
 323         evaluate_flags_writeback(flags);
 324 }
 325
 326 void  helper_evaluate_flags_mcp(void)
 327 {
 328         uint32_t src;
 329         uint32_t dst;
 330         uint32_t res;
 331         uint32_t flags = 0;
 332
 333         src = env->cc_src;
 334         dst = env->cc_dest;
 335         res = env->cc_result;
 336
 337         if ((res & 0x80000000L) != 0L)
 338         {
 339                 flags |= N_FLAG;
 340                 if (((src & 0x80000000L) == 0L)
 341                     && ((dst & 0x80000000L) == 0L))
 342                 {
 343                         flags |= V_FLAG;
 344                 }
 345                 else if (((src & 0x80000000L) != 0L) &&
 346                          ((dst & 0x80000000L) != 0L))
 347                 {
 348                         flags |= R_FLAG;
 349                 }
 350         }
 351         else
 352         {
 353                 if (res == 0L)
 354                         flags |= Z_FLAG;
 355                 if (((src & 0x80000000L) != 0L)
 356                     && ((dst & 0x80000000L) != 0L))
 357                         flags |= V_FLAG;
 358                 if ((dst & 0x80000000L) != 0L
 359                     || (src & 0x80000000L) != 0L)
 360                         flags |= R_FLAG;
 361         }
 362
 363         evaluate_flags_writeback(flags);
 364 }
 365
 366 void  helper_evaluate_flags_alu_4(void)
 367 {
 368         uint32_t src;
 369         uint32_t dst;
 370         uint32_t res;
 371         uint32_t flags = 0;
 372
 373         src = env->cc_src;
 374         dst = env->cc_dest;
 375
 376         /* Reconstruct the result.  */
 377         switch (env->cc_op)
 378         {
 379                 case CC_OP_SUB:
 380                         res = dst - src;
 381                         break;
 382                 case CC_OP_ADD:
 383                         res = dst + src;
 384                         break;
 385                 default:
 386                         res = env->cc_result;
 387                         break;
 388         }
 389
 390         if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 391                 src = ~src;
 392
 393         if ((res & 0x80000000L) != 0L)
 394         {
 395                 flags |= N_FLAG;
 396                 if (((src & 0x80000000L) == 0L)
 397                     && ((dst & 0x80000000L) == 0L))
 398                 {
 399                         flags |= V_FLAG;
 400                 }
 401                 else if (((src & 0x80000000L) != 0L) &&
 402                          ((dst & 0x80000000L) != 0L))
 403                 {
 404                         flags |= C_FLAG;
 405                 }
 406         }
 407         else
 408         {
 409                 if (res == 0L)
 410                         flags |= Z_FLAG;
 411                 if (((src & 0x80000000L) != 0L)
 412                     && ((dst & 0x80000000L) != 0L))
 413                         flags |= V_FLAG;
 414                 if ((dst & 0x80000000L) != 0L
 415                     || (src & 0x80000000L) != 0L)
 416                         flags |= C_FLAG;
 417         }
 418
 419         if (env->cc_op == CC_OP_SUB
 420             || env->cc_op == CC_OP_CMP) {
 421                 flags ^= C_FLAG;
 422         }
 423         evaluate_flags_writeback(flags);
 424 }
 425
 426 void  helper_evaluate_flags_move_4 (void)
 427 {
 428         uint32_t res;
 429         uint32_t flags = 0;
 430
 431         res = env->cc_result;
 432
 433         if ((int32_t)res < 0)
 434                 flags |= N_FLAG;
 435         else if (res == 0L)
 436                 flags |= Z_FLAG;
 437
 438         evaluate_flags_writeback(flags);
 439 }
 440 void  helper_evaluate_flags_move_2 (void)
 441 {
 442         uint32_t src;
 443         uint32_t flags = 0;
 444         uint16_t res;
 445
 446         src = env->cc_src;
 447         res = env->cc_result;
 448
 449         if ((int16_t)res < 0L)
 450                 flags |= N_FLAG;
 451         else if (res == 0)
 452                 flags |= Z_FLAG;
 453
 454         evaluate_flags_writeback(flags);
 455 }
 456
 457 /* TODO: This is expensive. We could split things up and only evaluate part of
 458    CCR on a need to know basis. For now, we simply re-evaluate everything.  */
 459 void helper_evaluate_flags (void)
 460 {
 461         uint32_t src;
 462         uint32_t dst;
 463         uint32_t 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
 575             || env->cc_op == CC_OP_CMP) {
 576                 flags ^= C_FLAG;
 577         }
 578         evaluate_flags_writeback(flags);
 579 }
 580
 581 void helper_top_evaluate_flags(void)
 582 {
 583         switch (env->cc_op)
 584         {
 585                 case CC_OP_MCP:
 586                         helper_evaluate_flags_mcp();
 587                         break;
 588                 case CC_OP_MULS:
 589                         helper_evaluate_flags_muls();
 590                         break;
 591                 case CC_OP_MULU:
 592                         helper_evaluate_flags_mulu();
 593                         break;
 594                 case CC_OP_MOVE:
 595                 case CC_OP_AND:
 596                 case CC_OP_OR:
 597                 case CC_OP_XOR:
 598                 case CC_OP_ASR:
 599                 case CC_OP_LSR:
 600                 case CC_OP_LSL:
 601                         switch (env->cc_size)
 602                         {
 603                                 case 4:
 604                                         helper_evaluate_flags_move_4();
 605                                         break;
 606                                 case 2:
 607                                         helper_evaluate_flags_move_2();
 608                                         break;
 609                                 default:
 610                                         helper_evaluate_flags();
 611                                         break;
 612                         }
 613                         break;
 614                 case CC_OP_FLAGS:
 615                         /* live.  */
 616                         break;
 617                 default:
 618                 {
 619                         switch (env->cc_size)
 620                         {
 621                                 case 4:
 622                                         helper_evaluate_flags_alu_4();
 623                                         break;
 624                                 default:
 625                                         helper_evaluate_flags();
 626                                         break;
 627                         }
 628                 }
 629                 break;
 630         }
 631 }