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 (__builtin_expect(ret, 0)) {
  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         cris_mmu_flush_pid(env, pid);
  95 #endif
  96 }
  97
  98 void helper_dump(uint32_t a0, uint32_t a1, uint32_t a2)
  99 {
 100         (fprintf(logfile, "%s: a0=%x a1=%x\n", __func__, a0, a1));
 101 }
 102
 103 void helper_dummy(void)
 104 {
 105
 106 }
 107
 108 /* Used by the tlb decoder.  */
 109 #define EXTRACT_FIELD(src, start, end) \
 110             (((src) >> start) & ((1 << (end - start + 1)) - 1))
 111
 112 void helper_movl_sreg_reg (uint32_t sreg, uint32_t reg)
 113 {
 114         uint32_t srs;
 115         srs = env->pregs[PR_SRS];
 116         srs &= 3;
 117         env->sregs[srs][sreg] = env->regs[reg];
 118
 119 #if !defined(CONFIG_USER_ONLY)
 120         if (srs == 1 || srs == 2) {
 121                 if (sreg == 6) {
 122                         /* Writes to tlb-hi write to mm_cause as a side
 123                            effect.  */
 124                         env->sregs[SFR_RW_MM_TLB_HI] = T0;
 125                         env->sregs[SFR_R_MM_CAUSE] = T0;
 126                 }
 127                 else if (sreg == 5) {
 128                         uint32_t set;
 129                         uint32_t idx;
 130                         uint32_t lo, hi;
 131                         uint32_t vaddr;
 132                         int tlb_v;
 133
 134                         idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 135                         set >>= 4;
 136                         set &= 3;
 137
 138                         idx &= 15;
 139                         /* We've just made a write to tlb_lo.  */
 140                         lo = env->sregs[SFR_RW_MM_TLB_LO];
 141                         /* Writes are done via r_mm_cause.  */
 142                         hi = env->sregs[SFR_R_MM_CAUSE];
 143
 144                         vaddr = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].hi,
 145                                               13, 31);
 146                         vaddr <<= TARGET_PAGE_BITS;
 147                         tlb_v = EXTRACT_FIELD(env->tlbsets[srs-1][set][idx].lo,
 148                                             3, 3);
 149                         env->tlbsets[srs - 1][set][idx].lo = lo;
 150                         env->tlbsets[srs - 1][set][idx].hi = hi;
 151
 152                         D(fprintf(logfile,
 153                                   "tlb flush vaddr=%x v=%d pc=%x\n",
 154                                   vaddr, tlb_v, env->pc));
 155                         tlb_flush_page(env, vaddr);
 156                 }
 157         }
 158 #endif
 159 }
 160
 161 void helper_movl_reg_sreg (uint32_t reg, uint32_t sreg)
 162 {
 163         uint32_t srs;
 164         env->pregs[PR_SRS] &= 3;
 165         srs = env->pregs[PR_SRS];
 166
 167 #if !defined(CONFIG_USER_ONLY)
 168         if (srs == 1 || srs == 2)
 169         {
 170                 uint32_t set;
 171                 uint32_t idx;
 172                 uint32_t lo, hi;
 173
 174                 idx = set = env->sregs[SFR_RW_MM_TLB_SEL];
 175                 set >>= 4;
 176                 set &= 3;
 177                 idx &= 15;
 178
 179                 /* Update the mirror regs.  */
 180                 hi = env->tlbsets[srs - 1][set][idx].hi;
 181                 lo = env->tlbsets[srs - 1][set][idx].lo;
 182                 env->sregs[SFR_RW_MM_TLB_HI] = hi;
 183                 env->sregs[SFR_RW_MM_TLB_LO] = lo;
 184         }
 185 #endif
 186         env->regs[reg] = env->sregs[srs][sreg];
 187         RETURN();
 188 }
 189
 190 static void cris_ccs_rshift(CPUState *env)
 191 {
 192         uint32_t ccs;
 193
 194         /* Apply the ccs shift.  */
 195         ccs = env->pregs[PR_CCS];
 196         ccs = (ccs & 0xc0000000) | ((ccs & 0x0fffffff) >> 10);
 197         if (ccs & U_FLAG)
 198         {
 199                 /* Enter user mode.  */
 200                 env->ksp = env->regs[R_SP];
 201                 env->regs[R_SP] = env->pregs[PR_USP];
 202         }
 203
 204         env->pregs[PR_CCS] = ccs;
 205 }
 206
 207 void helper_rfe(void)
 208 {
 209         int rflag = env->pregs[PR_CCS] & R_FLAG;
 210
 211         D(fprintf(logfile, "rfe: erp=%x pid=%x ccs=%x btarget=%x\n",
 212                  env->pregs[PR_ERP], env->pregs[PR_PID],
 213                  env->pregs[PR_CCS],
 214                  env->btarget));
 215
 216         cris_ccs_rshift(env);
 217
 218         /* RFE sets the P_FLAG only if the R_FLAG is not set.  */
 219         if (!rflag)
 220                 env->pregs[PR_CCS] |= P_FLAG;
 221 }
 222
 223 void helper_store(uint32_t a0)
 224 {
 225         if (env->pregs[PR_CCS] & P_FLAG )
 226         {
 227                 cpu_abort(env, "cond_store_failed! pc=%x a0=%x\n",
 228                           env->pc, a0);
 229         }
 230 }
 231
 232 void do_unassigned_access(target_phys_addr_t addr, int is_write, int is_exec,
 233                           int is_asi)
 234 {
 235         D(printf("%s addr=%x w=%d ex=%d asi=%d\n",
 236                 __func__, addr, is_write, is_exec, is_asi));
 237 }
 238
 239 static void evaluate_flags_writeback(uint32_t flags)
 240 {
 241         int x;
 242
 243         /* Extended arithmetics, leave the z flag alone.  */
 244         x = env->cc_x;
 245         if ((x || env->cc_op == CC_OP_ADDC)
 246             && flags & Z_FLAG)
 247                 env->cc_mask &= ~Z_FLAG;
 248
 249         /* all insn clear the x-flag except setf or clrf.  */
 250         env->pregs[PR_CCS] &= ~(env->cc_mask | X_FLAG);
 251         flags &= env->cc_mask;
 252         env->pregs[PR_CCS] |= flags;
 253 }
 254
 255 void helper_evaluate_flags_muls(void)
 256 {
 257         uint32_t src;
 258         uint32_t dst;
 259         uint32_t res;
 260         uint32_t flags = 0;
 261         int64_t tmp;
 262         int32_t mof;
 263         int dneg;
 264
 265         src = env->cc_src;
 266         dst = env->cc_dest;
 267         res = env->cc_result;
 268
 269         dneg = ((int32_t)res) < 0;
 270
 271         mof = env->pregs[PR_MOF];
 272         tmp = mof;
 273         tmp <<= 32;
 274         tmp |= res;
 275         if (tmp == 0)
 276                 flags |= Z_FLAG;
 277         else if (tmp < 0)
 278                 flags |= N_FLAG;
 279         if ((dneg && mof != -1)
 280             || (!dneg && mof != 0))
 281                 flags |= V_FLAG;
 282         evaluate_flags_writeback(flags);
 283 }
 284
 285 void  helper_evaluate_flags_mulu(void)
 286 {
 287         uint32_t src;
 288         uint32_t dst;
 289         uint32_t res;
 290         uint32_t flags = 0;
 291         uint64_t tmp;
 292         uint32_t mof;
 293
 294         src = env->cc_src;
 295         dst = env->cc_dest;
 296         res = env->cc_result;
 297
 298         mof = env->pregs[PR_MOF];
 299         tmp = mof;
 300         tmp <<= 32;
 301         tmp |= res;
 302         if (tmp == 0)
 303                 flags |= Z_FLAG;
 304         else if (tmp >> 63)
 305                 flags |= N_FLAG;
 306         if (mof)
 307                 flags |= V_FLAG;
 308
 309         evaluate_flags_writeback(flags);
 310 }
 311
 312 void  helper_evaluate_flags_mcp(void)
 313 {
 314         uint32_t src;
 315         uint32_t dst;
 316         uint32_t res;
 317         uint32_t flags = 0;
 318
 319         src = env->cc_src;
 320         dst = env->cc_dest;
 321         res = env->cc_result;
 322
 323         if ((res & 0x80000000L) != 0L)
 324         {
 325                 flags |= N_FLAG;
 326                 if (((src & 0x80000000L) == 0L)
 327                     && ((dst & 0x80000000L) == 0L))
 328                 {
 329                         flags |= V_FLAG;
 330                 }
 331                 else if (((src & 0x80000000L) != 0L) &&
 332                          ((dst & 0x80000000L) != 0L))
 333                 {
 334                         flags |= R_FLAG;
 335                 }
 336         }
 337         else
 338         {
 339                 if (res == 0L)
 340                         flags |= Z_FLAG;
 341                 if (((src & 0x80000000L) != 0L)
 342                     && ((dst & 0x80000000L) != 0L))
 343                         flags |= V_FLAG;
 344                 if ((dst & 0x80000000L) != 0L
 345                     || (src & 0x80000000L) != 0L)
 346                         flags |= R_FLAG;
 347         }
 348
 349         evaluate_flags_writeback(flags);
 350 }
 351
 352 void  helper_evaluate_flags_alu_4(void)
 353 {
 354         uint32_t src;
 355         uint32_t dst;
 356         uint32_t res;
 357         uint32_t flags = 0;
 358
 359         src = env->cc_src;
 360         dst = env->cc_dest;
 361
 362         /* Reconstruct the result.  */
 363         switch (env->cc_op)
 364         {
 365                 case CC_OP_SUB:
 366                         res = dst - src;
 367                         break;
 368                 case CC_OP_ADD:
 369                         res = dst + src;
 370                         break;
 371                 default:
 372                         res = env->cc_result;
 373                         break;
 374         }
 375
 376         if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 377                 src = ~src;
 378
 379         if ((res & 0x80000000L) != 0L)
 380         {
 381                 flags |= N_FLAG;
 382                 if (((src & 0x80000000L) == 0L)
 383                     && ((dst & 0x80000000L) == 0L))
 384                 {
 385                         flags |= V_FLAG;
 386                 }
 387                 else if (((src & 0x80000000L) != 0L) &&
 388                          ((dst & 0x80000000L) != 0L))
 389                 {
 390                         flags |= C_FLAG;
 391                 }
 392         }
 393         else
 394         {
 395                 if (res == 0L)
 396                         flags |= Z_FLAG;
 397                 if (((src & 0x80000000L) != 0L)
 398                     && ((dst & 0x80000000L) != 0L))
 399                         flags |= V_FLAG;
 400                 if ((dst & 0x80000000L) != 0L
 401                     || (src & 0x80000000L) != 0L)
 402                         flags |= C_FLAG;
 403         }
 404
 405         if (env->cc_op == CC_OP_SUB
 406             || env->cc_op == CC_OP_CMP) {
 407                 flags ^= C_FLAG;
 408         }
 409         evaluate_flags_writeback(flags);
 410 }
 411
 412 void  helper_evaluate_flags_move_4 (void)
 413 {
 414         uint32_t res;
 415         uint32_t flags = 0;
 416
 417         res = env->cc_result;
 418
 419         if ((int32_t)res < 0)
 420                 flags |= N_FLAG;
 421         else if (res == 0L)
 422                 flags |= Z_FLAG;
 423
 424         evaluate_flags_writeback(flags);
 425 }
 426 void  helper_evaluate_flags_move_2 (void)
 427 {
 428         uint32_t src;
 429         uint32_t flags = 0;
 430         uint16_t res;
 431
 432         src = env->cc_src;
 433         res = env->cc_result;
 434
 435         if ((int16_t)res < 0L)
 436                 flags |= N_FLAG;
 437         else if (res == 0)
 438                 flags |= Z_FLAG;
 439
 440         evaluate_flags_writeback(flags);
 441 }
 442
 443 /* TODO: This is expensive. We could split things up and only evaluate part of
 444    CCR on a need to know basis. For now, we simply re-evaluate everything.  */
 445 void helper_evaluate_flags (void)
 446 {
 447         uint32_t src;
 448         uint32_t dst;
 449         uint32_t res;
 450         uint32_t flags = 0;
 451
 452         src = env->cc_src;
 453         dst = env->cc_dest;
 454         res = env->cc_result;
 455
 456         if (env->cc_op == CC_OP_SUB || env->cc_op == CC_OP_CMP)
 457                 src = ~src;
 458
 459         /* Now, evaluate the flags. This stuff is based on
 460            Per Zander's CRISv10 simulator.  */
 461         switch (env->cc_size)
 462         {
 463                 case 1:
 464                         if ((res & 0x80L) != 0L)
 465                         {
 466                                 flags |= N_FLAG;
 467                                 if (((src & 0x80L) == 0L)
 468                                     && ((dst & 0x80L) == 0L))
 469                                 {
 470                                         flags |= V_FLAG;
 471                                 }
 472                                 else if (((src & 0x80L) != 0L)
 473                                          && ((dst & 0x80L) != 0L))
 474                                 {
 475                                         flags |= C_FLAG;
 476                                 }
 477                         }
 478                         else
 479                         {
 480                                 if ((res & 0xFFL) == 0L)
 481                                 {
 482                                         flags |= Z_FLAG;
 483                                 }
 484                                 if (((src & 0x80L) != 0L)
 485                                     && ((dst & 0x80L) != 0L))
 486                                 {
 487                                         flags |= V_FLAG;
 488                                 }
 489                                 if ((dst & 0x80L) != 0L
 490                                     || (src & 0x80L) != 0L)
 491                                 {
 492                                         flags |= C_FLAG;
 493                                 }
 494                         }
 495                         break;
 496                 case 2:
 497                         if ((res & 0x8000L) != 0L)
 498                         {
 499                                 flags |= N_FLAG;
 500                                 if (((src & 0x8000L) == 0L)
 501                                     && ((dst & 0x8000L) == 0L))
 502                                 {
 503                                         flags |= V_FLAG;
 504                                 }
 505                                 else if (((src & 0x8000L) != 0L)
 506                                          && ((dst & 0x8000L) != 0L))
 507                                 {
 508                                         flags |= C_FLAG;
 509                                 }
 510                         }
 511                         else
 512                         {
 513                                 if ((res & 0xFFFFL) == 0L)
 514                                 {
 515                                         flags |= Z_FLAG;
 516                                 }
 517                                 if (((src & 0x8000L) != 0L)
 518                                     && ((dst & 0x8000L) != 0L))
 519                                 {
 520                                         flags |= V_FLAG;
 521                                 }
 522                                 if ((dst & 0x8000L) != 0L
 523                                     || (src & 0x8000L) != 0L)
 524                                 {
 525                                         flags |= C_FLAG;
 526                                 }
 527                         }
 528                         break;
 529                 case 4:
 530                         if ((res & 0x80000000L) != 0L)
 531                         {
 532                                 flags |= N_FLAG;
 533                                 if (((src & 0x80000000L) == 0L)
 534                                     && ((dst & 0x80000000L) == 0L))
 535                                 {
 536                                         flags |= V_FLAG;
 537                                 }
 538                                 else if (((src & 0x80000000L) != 0L) &&
 539                                          ((dst & 0x80000000L) != 0L))
 540                                 {
 541                                         flags |= C_FLAG;
 542                                 }
 543                         }
 544                         else
 545                         {
 546                                 if (res == 0L)
 547                                         flags |= Z_FLAG;
 548                                 if (((src & 0x80000000L) != 0L)
 549                                     && ((dst & 0x80000000L) != 0L))
 550                                         flags |= V_FLAG;
 551                                 if ((dst & 0x80000000L) != 0L
 552                                     || (src & 0x80000000L) != 0L)
 553                                         flags |= C_FLAG;
 554                         }
 555                         break;
 556                 default:
 557                         break;
 558         }
 559
 560         if (env->cc_op == CC_OP_SUB
 561             || env->cc_op == CC_OP_CMP) {
 562                 flags ^= C_FLAG;
 563         }
 564         evaluate_flags_writeback(flags);
 565 }
 566
 567 void helper_top_evaluate_flags(void)
 568 {
 569         switch (env->cc_op)
 570         {
 571                 case CC_OP_MCP:
 572                         helper_evaluate_flags_mcp();
 573                         break;
 574                 case CC_OP_MULS:
 575                         helper_evaluate_flags_muls();
 576                         break;
 577                 case CC_OP_MULU:
 578                         helper_evaluate_flags_mulu();
 579                         break;
 580                 case CC_OP_MOVE:
 581                 case CC_OP_AND:
 582                 case CC_OP_OR:
 583                 case CC_OP_XOR:
 584                 case CC_OP_ASR:
 585                 case CC_OP_LSR:
 586                 case CC_OP_LSL:
 587                         switch (env->cc_size)
 588                         {
 589                                 case 4:
 590                                         helper_evaluate_flags_move_4();
 591                                         break;
 592                                 case 2:
 593                                         helper_evaluate_flags_move_2();
 594                                         break;
 595                                 default:
 596                                         helper_evaluate_flags();
 597                                         break;
 598                         }
 599                         break;
 600                 case CC_OP_FLAGS:
 601                         /* live.  */
 602                         break;
 603                 default:
 604                 {
 605                         switch (env->cc_size)
 606                         {
 607                                 case 4:
 608                                         helper_evaluate_flags_alu_4();
 609                                         break;
 610                                 default:
 611                                         helper_evaluate_flags();
 612                                         break;
 613                         }
 614                 }
 615                 break;
 616         }
 617 }