target-mips/helper.c

   1 /*
   2  *  MIPS emulation helpers for qemu.
   3  *
   4  *  Copyright (c) 2004-2005 Jocelyn Mayer
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <stdarg.h>
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <inttypes.h>
  25 #include <signal.h>
  26 #include <assert.h>
  27
  28 #include "cpu.h"
  29 #include "exec-all.h"
  30
  31 enum {
  32     TLBRET_DIRTY = -4,
  33     TLBRET_INVALID = -3,
  34     TLBRET_NOMATCH = -2,
  35     TLBRET_BADADDR = -1,
  36     TLBRET_MATCH = 0
  37 };
  38
  39 /* no MMU emulation */
  40 int no_mmu_map_address (CPUState *env, target_ulong *physical, int *prot,
  41                         target_ulong address, int rw, int access_type)
  42 {
  43     *physical = address;
  44     *prot = PAGE_READ | PAGE_WRITE;
  45     return TLBRET_MATCH;
  46 }
  47
  48 /* fixed mapping MMU emulation */
  49 int fixed_mmu_map_address (CPUState *env, target_ulong *physical, int *prot,
  50                            target_ulong address, int rw, int access_type)
  51 {
  52     if (address <= (int32_t)0x7FFFFFFFUL) {
  53         if (!(env->CP0_Status & (1 << CP0St_ERL)))
  54             *physical = address + 0x40000000UL;
  55         else
  56             *physical = address;
  57     } else if (address <= (int32_t)0xBFFFFFFFUL)
  58         *physical = address & 0x1FFFFFFF;
  59     else
  60         *physical = address;
  61
  62     *prot = PAGE_READ | PAGE_WRITE;
  63     return TLBRET_MATCH;
  64 }
  65
  66 /* MIPS32/MIPS64 R4000-style MMU emulation */
  67 int r4k_map_address (CPUState *env, target_ulong *physical, int *prot,
  68                      target_ulong address, int rw, int access_type)
  69 {
  70     uint8_t ASID = env->CP0_EntryHi & 0xFF;
  71     int i;
  72
  73     for (i = 0; i < env->tlb->tlb_in_use; i++) {
  74         r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i];
  75         /* 1k pages are not supported. */
  76         target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
  77         target_ulong tag = address & ~mask;
  78         target_ulong VPN = tlb->VPN & ~mask;
  79 #if defined(TARGET_MIPS64)
  80         tag &= env->SEGMask;
  81 #endif
  82
  83         /* Check ASID, virtual page number & size */
  84         if ((tlb->G == 1 || tlb->ASID == ASID) && VPN == tag) {
  85             /* TLB match */
  86             int n = !!(address & mask & ~(mask >> 1));
  87             /* Check access rights */
  88             if (!(n ? tlb->V1 : tlb->V0))
  89                 return TLBRET_INVALID;
  90             if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
  91                 *physical = tlb->PFN[n] | (address & (mask >> 1));
  92                 *prot = PAGE_READ;
  93                 if (n ? tlb->D1 : tlb->D0)
  94                     *prot |= PAGE_WRITE;
  95                 return TLBRET_MATCH;
  96             }
  97             return TLBRET_DIRTY;
  98         }
  99     }
 100     return TLBRET_NOMATCH;
 101 }
 102
 103 static int get_physical_address (CPUState *env, target_ulong *physical,
 104                                 int *prot, target_ulong address,
 105                                 int rw, int access_type)
 106 {
 107     /* User mode can only access useg/xuseg */
 108     int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
 109     int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
 110     int kernel_mode = !user_mode && !supervisor_mode;
 111 #if defined(TARGET_MIPS64)
 112     int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
 113     int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
 114     int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
 115 #endif
 116     int ret = TLBRET_MATCH;
 117
 118 #if 0
 119     if (logfile) {
 120         fprintf(logfile, "user mode %d h %08x\n",
 121                 user_mode, env->hflags);
 122     }
 123 #endif
 124
 125     if (address <= (int32_t)0x7FFFFFFFUL) {
 126         /* useg */
 127         if (env->CP0_Status & (1 << CP0St_ERL)) {
 128             *physical = address & 0xFFFFFFFF;
 129             *prot = PAGE_READ | PAGE_WRITE;
 130         } else {
 131             ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
 132         }
 133 #if defined(TARGET_MIPS64)
 134     } else if (address < 0x4000000000000000ULL) {
 135         /* xuseg */
 136         if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
 137             ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
 138         } else {
 139             ret = TLBRET_BADADDR;
 140         }
 141     } else if (address < 0x8000000000000000ULL) {
 142         /* xsseg */
 143         if ((supervisor_mode || kernel_mode) &&
 144             SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
 145             ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
 146         } else {
 147             ret = TLBRET_BADADDR;
 148         }
 149     } else if (address < 0xC000000000000000ULL) {
 150         /* xkphys */
 151         if (kernel_mode && KX &&
 152             (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
 153             *physical = address & env->PAMask;
 154             *prot = PAGE_READ | PAGE_WRITE;
 155         } else {
 156             ret = TLBRET_BADADDR;
 157         }
 158     } else if (address < 0xFFFFFFFF80000000ULL) {
 159         /* xkseg */
 160         if (kernel_mode && KX &&
 161             address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
 162             ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
 163         } else {
 164             ret = TLBRET_BADADDR;
 165         }
 166 #endif
 167     } else if (address < (int32_t)0xA0000000UL) {
 168         /* kseg0 */
 169         if (kernel_mode) {
 170             *physical = address - (int32_t)0x80000000UL;
 171             *prot = PAGE_READ | PAGE_WRITE;
 172         } else {
 173             ret = TLBRET_BADADDR;
 174         }
 175     } else if (address < (int32_t)0xC0000000UL) {
 176         /* kseg1 */
 177         if (kernel_mode) {
 178             *physical = address - (int32_t)0xA0000000UL;
 179             *prot = PAGE_READ | PAGE_WRITE;
 180         } else {
 181             ret = TLBRET_BADADDR;
 182         }
 183     } else if (address < (int32_t)0xE0000000UL) {
 184         /* sseg (kseg2) */
 185         if (supervisor_mode || kernel_mode) {
 186             ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
 187         } else {
 188             ret = TLBRET_BADADDR;
 189         }
 190     } else {
 191         /* kseg3 */
 192         /* XXX: debug segment is not emulated */
 193         if (kernel_mode) {
 194             ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
 195         } else {
 196             ret = TLBRET_BADADDR;
 197         }
 198     }
 199 #if 0
 200     if (logfile) {
 201         fprintf(logfile, TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n",
 202                 address, rw, access_type, *physical, *prot, ret);
 203     }
 204 #endif
 205
 206     return ret;
 207 }
 208
 209 #if defined(CONFIG_USER_ONLY)
 210 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
 211 {
 212     return addr;
 213 }
 214 #else
 215 target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
 216 {
 217     target_ulong phys_addr;
 218     int prot;
 219
 220     if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0)
 221         return -1;
 222     return phys_addr;
 223 }
 224
 225 void cpu_mips_init_mmu (CPUState *env)
 226 {
 227 }
 228 #endif /* !defined(CONFIG_USER_ONLY) */
 229
 230 int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
 231                                int mmu_idx, int is_softmmu)
 232 {
 233     target_ulong physical;
 234     int prot;
 235     int exception = 0, error_code = 0;
 236     int access_type;
 237     int ret = 0;
 238
 239     if (logfile) {
 240 #if 0
 241         cpu_dump_state(env, logfile, fprintf, 0);
 242 #endif
 243         fprintf(logfile, "%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d smmu %d\n",
 244                 __func__, env->PC[env->current_tc], address, rw, mmu_idx, is_softmmu);
 245     }
 246
 247     rw &= 1;
 248
 249     /* data access */
 250     /* XXX: put correct access by using cpu_restore_state()
 251        correctly */
 252     access_type = ACCESS_INT;
 253     if (env->user_mode_only) {
 254         /* user mode only emulation */
 255         ret = TLBRET_NOMATCH;
 256         goto do_fault;
 257     }
 258     ret = get_physical_address(env, &physical, &prot,
 259                                address, rw, access_type);
 260     if (logfile) {
 261         fprintf(logfile, "%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_lx " prot %d\n",
 262                 __func__, address, ret, physical, prot);
 263     }
 264     if (ret == TLBRET_MATCH) {
 265        ret = tlb_set_page(env, address & TARGET_PAGE_MASK,
 266                           physical & TARGET_PAGE_MASK, prot,
 267                           mmu_idx, is_softmmu);
 268     } else if (ret < 0) {
 269     do_fault:
 270         switch (ret) {
 271         default:
 272         case TLBRET_BADADDR:
 273             /* Reference to kernel address from user mode or supervisor mode */
 274             /* Reference to supervisor address from user mode */
 275             if (rw)
 276                 exception = EXCP_AdES;
 277             else
 278                 exception = EXCP_AdEL;
 279             break;
 280         case TLBRET_NOMATCH:
 281             /* No TLB match for a mapped address */
 282             if (rw)
 283                 exception = EXCP_TLBS;
 284             else
 285                 exception = EXCP_TLBL;
 286             error_code = 1;
 287             break;
 288         case TLBRET_INVALID:
 289             /* TLB match with no valid bit */
 290             if (rw)
 291                 exception = EXCP_TLBS;
 292             else
 293                 exception = EXCP_TLBL;
 294             break;
 295         case TLBRET_DIRTY:
 296             /* TLB match but 'D' bit is cleared */
 297             exception = EXCP_LTLBL;
 298             break;
 299
 300         }
 301         /* Raise exception */
 302         env->CP0_BadVAddr = address;
 303         env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
 304                            ((address >> 9) &   0x007ffff0);
 305         env->CP0_EntryHi =
 306             (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
 307 #if defined(TARGET_MIPS64)
 308         env->CP0_EntryHi &= env->SEGMask;
 309         env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
 310                             ((address & 0xC00000000000ULL) >> (env->SEGBITS - 9)) |
 311                             ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
 312 #endif
 313         env->exception_index = exception;
 314         env->error_code = error_code;
 315         ret = 1;
 316     }
 317
 318     return ret;
 319 }
 320
 321 #if !defined(CONFIG_USER_ONLY)
 322 static const char * const excp_names[EXCP_LAST + 1] = {
 323     [EXCP_RESET] = "reset",
 324     [EXCP_SRESET] = "soft reset",
 325     [EXCP_DSS] = "debug single step",
 326     [EXCP_DINT] = "debug interrupt",
 327     [EXCP_NMI] = "non-maskable interrupt",
 328     [EXCP_MCHECK] = "machine check",
 329     [EXCP_EXT_INTERRUPT] = "interrupt",
 330     [EXCP_DFWATCH] = "deferred watchpoint",
 331     [EXCP_DIB] = "debug instruction breakpoint",
 332     [EXCP_IWATCH] = "instruction fetch watchpoint",
 333     [EXCP_AdEL] = "address error load",
 334     [EXCP_AdES] = "address error store",
 335     [EXCP_TLBF] = "TLB refill",
 336     [EXCP_IBE] = "instruction bus error",
 337     [EXCP_DBp] = "debug breakpoint",
 338     [EXCP_SYSCALL] = "syscall",
 339     [EXCP_BREAK] = "break",
 340     [EXCP_CpU] = "coprocessor unusable",
 341     [EXCP_RI] = "reserved instruction",
 342     [EXCP_OVERFLOW] = "arithmetic overflow",
 343     [EXCP_TRAP] = "trap",
 344     [EXCP_FPE] = "floating point",
 345     [EXCP_DDBS] = "debug data break store",
 346     [EXCP_DWATCH] = "data watchpoint",
 347     [EXCP_LTLBL] = "TLB modify",
 348     [EXCP_TLBL] = "TLB load",
 349     [EXCP_TLBS] = "TLB store",
 350     [EXCP_DBE] = "data bus error",
 351     [EXCP_DDBL] = "debug data break load",
 352     [EXCP_THREAD] = "thread",
 353     [EXCP_MDMX] = "MDMX",
 354     [EXCP_C2E] = "precise coprocessor 2",
 355     [EXCP_CACHE] = "cache error",
 356 };
 357 #endif
 358
 359 void do_interrupt (CPUState *env)
 360 {
 361 #if !defined(CONFIG_USER_ONLY)
 362     target_ulong offset;
 363     int cause = -1;
 364     const char *name;
 365
 366     if (logfile && env->exception_index != EXCP_EXT_INTERRUPT) {
 367         if (env->exception_index < 0 || env->exception_index > EXCP_LAST)
 368             name = "unknown";
 369         else
 370             name = excp_names[env->exception_index];
 371
 372         fprintf(logfile, "%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
 373                 __func__, env->PC[env->current_tc], env->CP0_EPC, name);
 374     }
 375     if (env->exception_index == EXCP_EXT_INTERRUPT &&
 376         (env->hflags & MIPS_HFLAG_DM))
 377         env->exception_index = EXCP_DINT;
 378     offset = 0x180;
 379     switch (env->exception_index) {
 380     case EXCP_DSS:
 381         env->CP0_Debug |= 1 << CP0DB_DSS;
 382         /* Debug single step cannot be raised inside a delay slot and
 383          * resume will always occur on the next instruction
 384          * (but we assume the pc has always been updated during
 385          *  code translation).
 386          */
 387         env->CP0_DEPC = env->PC[env->current_tc];
 388         goto enter_debug_mode;
 389     case EXCP_DINT:
 390         env->CP0_Debug |= 1 << CP0DB_DINT;
 391         goto set_DEPC;
 392     case EXCP_DIB:
 393         env->CP0_Debug |= 1 << CP0DB_DIB;
 394         goto set_DEPC;
 395     case EXCP_DBp:
 396         env->CP0_Debug |= 1 << CP0DB_DBp;
 397         goto set_DEPC;
 398     case EXCP_DDBS:
 399         env->CP0_Debug |= 1 << CP0DB_DDBS;
 400         goto set_DEPC;
 401     case EXCP_DDBL:
 402         env->CP0_Debug |= 1 << CP0DB_DDBL;
 403     set_DEPC:
 404         if (env->hflags & MIPS_HFLAG_BMASK) {
 405             /* If the exception was raised from a delay slot,
 406                come back to the jump.  */
 407             env->CP0_DEPC = env->PC[env->current_tc] - 4;
 408             env->hflags &= ~MIPS_HFLAG_BMASK;
 409         } else {
 410             env->CP0_DEPC = env->PC[env->current_tc];
 411         }
 412     enter_debug_mode:
 413         env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
 414         env->hflags &= ~(MIPS_HFLAG_KSU);
 415         /* EJTAG probe trap enable is not implemented... */
 416         if (!(env->CP0_Status & (1 << CP0St_EXL)))
 417             env->CP0_Cause &= ~(1 << CP0Ca_BD);
 418         env->PC[env->current_tc] = (int32_t)0xBFC00480;
 419         break;
 420     case EXCP_RESET:
 421         cpu_reset(env);
 422         break;
 423     case EXCP_SRESET:
 424         env->CP0_Status |= (1 << CP0St_SR);
 425         memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
 426         goto set_error_EPC;
 427     case EXCP_NMI:
 428         env->CP0_Status |= (1 << CP0St_NMI);
 429     set_error_EPC:
 430         if (env->hflags & MIPS_HFLAG_BMASK) {
 431             /* If the exception was raised from a delay slot,
 432                come back to the jump.  */
 433             env->CP0_ErrorEPC = env->PC[env->current_tc] - 4;
 434             env->hflags &= ~MIPS_HFLAG_BMASK;
 435         } else {
 436             env->CP0_ErrorEPC = env->PC[env->current_tc];
 437         }
 438         env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
 439         env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
 440         env->hflags &= ~(MIPS_HFLAG_KSU);
 441         if (!(env->CP0_Status & (1 << CP0St_EXL)))
 442             env->CP0_Cause &= ~(1 << CP0Ca_BD);
 443         env->PC[env->current_tc] = (int32_t)0xBFC00000;
 444         break;
 445     case EXCP_EXT_INTERRUPT:
 446         cause = 0;
 447         if (env->CP0_Cause & (1 << CP0Ca_IV))
 448             offset = 0x200;
 449         goto set_EPC;
 450     case EXCP_LTLBL:
 451         cause = 1;
 452         goto set_EPC;
 453     case EXCP_TLBL:
 454         cause = 2;
 455         if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
 456 #if defined(TARGET_MIPS64)
 457             int R = env->CP0_BadVAddr >> 62;
 458             int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
 459             int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
 460             int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
 461
 462             if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
 463                 offset = 0x080;
 464             else
 465 #endif
 466                 offset = 0x000;
 467         }
 468         goto set_EPC;
 469     case EXCP_TLBS:
 470         cause = 3;
 471         if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
 472 #if defined(TARGET_MIPS64)
 473             int R = env->CP0_BadVAddr >> 62;
 474             int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
 475             int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
 476             int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
 477
 478             if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
 479                 offset = 0x080;
 480             else
 481 #endif
 482                 offset = 0x000;
 483         }
 484         goto set_EPC;
 485     case EXCP_AdEL:
 486         cause = 4;
 487         goto set_EPC;
 488     case EXCP_AdES:
 489         cause = 5;
 490         goto set_EPC;
 491     case EXCP_IBE:
 492         cause = 6;
 493         goto set_EPC;
 494     case EXCP_DBE:
 495         cause = 7;
 496         goto set_EPC;
 497     case EXCP_SYSCALL:
 498         cause = 8;
 499         goto set_EPC;
 500     case EXCP_BREAK:
 501         cause = 9;
 502         goto set_EPC;
 503     case EXCP_RI:
 504         cause = 10;
 505         goto set_EPC;
 506     case EXCP_CpU:
 507         cause = 11;
 508         env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
 509                          (env->error_code << CP0Ca_CE);
 510         goto set_EPC;
 511     case EXCP_OVERFLOW:
 512         cause = 12;
 513         goto set_EPC;
 514     case EXCP_TRAP:
 515         cause = 13;
 516         goto set_EPC;
 517     case EXCP_FPE:
 518         cause = 15;
 519         goto set_EPC;
 520     case EXCP_C2E:
 521         cause = 18;
 522         goto set_EPC;
 523     case EXCP_MDMX:
 524         cause = 22;
 525         goto set_EPC;
 526     case EXCP_DWATCH:
 527         cause = 23;
 528         /* XXX: TODO: manage defered watch exceptions */
 529         goto set_EPC;
 530     case EXCP_MCHECK:
 531         cause = 24;
 532         goto set_EPC;
 533     case EXCP_THREAD:
 534         cause = 25;
 535         goto set_EPC;
 536     case EXCP_CACHE:
 537         cause = 30;
 538         if (env->CP0_Status & (1 << CP0St_BEV)) {
 539             offset = 0x100;
 540         } else {
 541             offset = 0x20000100;
 542         }
 543     set_EPC:
 544         if (!(env->CP0_Status & (1 << CP0St_EXL))) {
 545             if (env->hflags & MIPS_HFLAG_BMASK) {
 546                 /* If the exception was raised from a delay slot,
 547                    come back to the jump.  */
 548                 env->CP0_EPC = env->PC[env->current_tc] - 4;
 549                 env->CP0_Cause |= (1 << CP0Ca_BD);
 550             } else {
 551                 env->CP0_EPC = env->PC[env->current_tc];
 552                 env->CP0_Cause &= ~(1 << CP0Ca_BD);
 553             }
 554             env->CP0_Status |= (1 << CP0St_EXL);
 555             env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
 556             env->hflags &= ~(MIPS_HFLAG_KSU);
 557         }
 558         env->hflags &= ~MIPS_HFLAG_BMASK;
 559         if (env->CP0_Status & (1 << CP0St_BEV)) {
 560             env->PC[env->current_tc] = (int32_t)0xBFC00200;
 561         } else {
 562             env->PC[env->current_tc] = (int32_t)(env->CP0_EBase & ~0x3ff);
 563         }
 564         env->PC[env->current_tc] += offset;
 565         env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
 566         break;
 567     default:
 568         if (logfile) {
 569             fprintf(logfile, "Invalid MIPS exception %d. Exiting\n",
 570                     env->exception_index);
 571         }
 572         printf("Invalid MIPS exception %d. Exiting\n", env->exception_index);
 573         exit(1);
 574     }
 575     if (logfile && env->exception_index != EXCP_EXT_INTERRUPT) {
 576         fprintf(logfile, "%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
 577                 "    S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
 578                 __func__, env->PC[env->current_tc], env->CP0_EPC, cause,
 579                 env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
 580                 env->CP0_DEPC);
 581     }
 582 #endif /* !defined(CONFIG_USER_ONLY) */
 583     env->exception_index = EXCP_NONE;
 584 }
 585
 586 void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra)
 587 {
 588     r4k_tlb_t *tlb;
 589     target_ulong addr;
 590     target_ulong end;
 591     uint8_t ASID = env->CP0_EntryHi & 0xFF;
 592     target_ulong mask;
 593
 594     tlb = &env->tlb->mmu.r4k.tlb[idx];
 595     /* The qemu TLB is flushed when the ASID changes, so no need to
 596        flush these entries again.  */
 597     if (tlb->G == 0 && tlb->ASID != ASID) {
 598         return;
 599     }
 600
 601     if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
 602         /* For tlbwr, we can shadow the discarded entry into
 603            a new (fake) TLB entry, as long as the guest can not
 604            tell that it's there.  */
 605         env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
 606         env->tlb->tlb_in_use++;
 607         return;
 608     }
 609
 610     /* 1k pages are not supported. */
 611     mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
 612     if (tlb->V0) {
 613         addr = tlb->VPN & ~mask;
 614 #if defined(TARGET_MIPS64)
 615         if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
 616             addr |= 0x3FFFFF0000000000ULL;
 617         }
 618 #endif
 619         end = addr | (mask >> 1);
 620         while (addr < end) {
 621             tlb_flush_page (env, addr);
 622             addr += TARGET_PAGE_SIZE;
 623         }
 624     }
 625     if (tlb->V1) {
 626         addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
 627 #if defined(TARGET_MIPS64)
 628         if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
 629             addr |= 0x3FFFFF0000000000ULL;
 630         }
 631 #endif
 632         end = addr | mask;
 633         while (addr < end) {
 634             tlb_flush_page (env, addr);
 635             addr += TARGET_PAGE_SIZE;
 636         }
 637     }
 638 }