1 /* 2 * MIPS TLB (Translation lookaside buffer) helpers. 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 2.1 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, see <http://www.gnu.org/licenses/>. 18 */ 19 #include "qemu/osdep.h" 20 #include "qemu/bitops.h" 21 22 #include "cpu.h" 23 #include "internal.h" 24 #include "exec/exec-all.h" 25 #include "exec/cpu_ldst.h" 26 #include "exec/log.h" 27 #include "hw/mips/cpudevs.h" 28 #include "exec/helper-proto.h" 29 30 /* TLB management */ 31 static void r4k_mips_tlb_flush_extra(CPUMIPSState *env, int first) 32 { 33 /* Discard entries from env->tlb[first] onwards. */ 34 while (env->tlb->tlb_in_use > first) { 35 r4k_invalidate_tlb(env, --env->tlb->tlb_in_use, 0); 36 } 37 } 38 39 static inline uint64_t get_tlb_pfn_from_entrylo(uint64_t entrylo) 40 { 41 #if defined(TARGET_MIPS64) 42 return extract64(entrylo, 6, 54); 43 #else 44 return extract64(entrylo, 6, 24) | /* PFN */ 45 (extract64(entrylo, 32, 32) << 24); /* PFNX */ 46 #endif 47 } 48 49 static void r4k_fill_tlb(CPUMIPSState *env, int idx) 50 { 51 r4k_tlb_t *tlb; 52 uint64_t mask = env->CP0_PageMask >> (TARGET_PAGE_BITS + 1); 53 54 /* XXX: detect conflicting TLBs and raise a MCHECK exception when needed */ 55 tlb = &env->tlb->mmu.r4k.tlb[idx]; 56 if (env->CP0_EntryHi & (1 << CP0EnHi_EHINV)) { 57 tlb->EHINV = 1; 58 return; 59 } 60 tlb->EHINV = 0; 61 tlb->VPN = env->CP0_EntryHi & (TARGET_PAGE_MASK << 1); 62 #if defined(TARGET_MIPS64) 63 tlb->VPN &= env->SEGMask; 64 #endif 65 tlb->ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 66 tlb->MMID = env->CP0_MemoryMapID; 67 tlb->PageMask = env->CP0_PageMask; 68 tlb->G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1; 69 tlb->V0 = (env->CP0_EntryLo0 & 2) != 0; 70 tlb->D0 = (env->CP0_EntryLo0 & 4) != 0; 71 tlb->C0 = (env->CP0_EntryLo0 >> 3) & 0x7; 72 tlb->XI0 = (env->CP0_EntryLo0 >> CP0EnLo_XI) & 1; 73 tlb->RI0 = (env->CP0_EntryLo0 >> CP0EnLo_RI) & 1; 74 tlb->PFN[0] = (get_tlb_pfn_from_entrylo(env->CP0_EntryLo0) & ~mask) << 12; 75 tlb->V1 = (env->CP0_EntryLo1 & 2) != 0; 76 tlb->D1 = (env->CP0_EntryLo1 & 4) != 0; 77 tlb->C1 = (env->CP0_EntryLo1 >> 3) & 0x7; 78 tlb->XI1 = (env->CP0_EntryLo1 >> CP0EnLo_XI) & 1; 79 tlb->RI1 = (env->CP0_EntryLo1 >> CP0EnLo_RI) & 1; 80 tlb->PFN[1] = (get_tlb_pfn_from_entrylo(env->CP0_EntryLo1) & ~mask) << 12; 81 } 82 83 static void r4k_helper_tlbinv(CPUMIPSState *env) 84 { 85 bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1); 86 uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 87 uint32_t MMID = env->CP0_MemoryMapID; 88 uint32_t tlb_mmid; 89 r4k_tlb_t *tlb; 90 int idx; 91 92 MMID = mi ? MMID : (uint32_t) ASID; 93 for (idx = 0; idx < env->tlb->nb_tlb; idx++) { 94 tlb = &env->tlb->mmu.r4k.tlb[idx]; 95 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 96 if (!tlb->G && tlb_mmid == MMID) { 97 tlb->EHINV = 1; 98 } 99 } 100 cpu_mips_tlb_flush(env); 101 } 102 103 static void r4k_helper_tlbinvf(CPUMIPSState *env) 104 { 105 int idx; 106 107 for (idx = 0; idx < env->tlb->nb_tlb; idx++) { 108 env->tlb->mmu.r4k.tlb[idx].EHINV = 1; 109 } 110 cpu_mips_tlb_flush(env); 111 } 112 113 static void r4k_helper_tlbwi(CPUMIPSState *env) 114 { 115 bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1); 116 target_ulong VPN; 117 uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 118 uint32_t MMID = env->CP0_MemoryMapID; 119 uint32_t tlb_mmid; 120 bool EHINV, G, V0, D0, V1, D1, XI0, XI1, RI0, RI1; 121 r4k_tlb_t *tlb; 122 int idx; 123 124 MMID = mi ? MMID : (uint32_t) ASID; 125 126 idx = (env->CP0_Index & ~0x80000000) % env->tlb->nb_tlb; 127 tlb = &env->tlb->mmu.r4k.tlb[idx]; 128 VPN = env->CP0_EntryHi & (TARGET_PAGE_MASK << 1); 129 #if defined(TARGET_MIPS64) 130 VPN &= env->SEGMask; 131 #endif 132 EHINV = (env->CP0_EntryHi & (1 << CP0EnHi_EHINV)) != 0; 133 G = env->CP0_EntryLo0 & env->CP0_EntryLo1 & 1; 134 V0 = (env->CP0_EntryLo0 & 2) != 0; 135 D0 = (env->CP0_EntryLo0 & 4) != 0; 136 XI0 = (env->CP0_EntryLo0 >> CP0EnLo_XI) &1; 137 RI0 = (env->CP0_EntryLo0 >> CP0EnLo_RI) &1; 138 V1 = (env->CP0_EntryLo1 & 2) != 0; 139 D1 = (env->CP0_EntryLo1 & 4) != 0; 140 XI1 = (env->CP0_EntryLo1 >> CP0EnLo_XI) &1; 141 RI1 = (env->CP0_EntryLo1 >> CP0EnLo_RI) &1; 142 143 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 144 /* 145 * Discard cached TLB entries, unless tlbwi is just upgrading access 146 * permissions on the current entry. 147 */ 148 if (tlb->VPN != VPN || tlb_mmid != MMID || tlb->G != G || 149 (!tlb->EHINV && EHINV) || 150 (tlb->V0 && !V0) || (tlb->D0 && !D0) || 151 (!tlb->XI0 && XI0) || (!tlb->RI0 && RI0) || 152 (tlb->V1 && !V1) || (tlb->D1 && !D1) || 153 (!tlb->XI1 && XI1) || (!tlb->RI1 && RI1)) { 154 r4k_mips_tlb_flush_extra(env, env->tlb->nb_tlb); 155 } 156 157 r4k_invalidate_tlb(env, idx, 0); 158 r4k_fill_tlb(env, idx); 159 } 160 161 static void r4k_helper_tlbwr(CPUMIPSState *env) 162 { 163 int r = cpu_mips_get_random(env); 164 165 r4k_invalidate_tlb(env, r, 1); 166 r4k_fill_tlb(env, r); 167 } 168 169 static void r4k_helper_tlbp(CPUMIPSState *env) 170 { 171 bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1); 172 r4k_tlb_t *tlb; 173 target_ulong mask; 174 target_ulong tag; 175 target_ulong VPN; 176 uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 177 uint32_t MMID = env->CP0_MemoryMapID; 178 uint32_t tlb_mmid; 179 int i; 180 181 MMID = mi ? MMID : (uint32_t) ASID; 182 for (i = 0; i < env->tlb->nb_tlb; i++) { 183 tlb = &env->tlb->mmu.r4k.tlb[i]; 184 /* 1k pages are not supported. */ 185 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1); 186 tag = env->CP0_EntryHi & ~mask; 187 VPN = tlb->VPN & ~mask; 188 #if defined(TARGET_MIPS64) 189 tag &= env->SEGMask; 190 #endif 191 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 192 /* Check ASID/MMID, virtual page number & size */ 193 if ((tlb->G == 1 || tlb_mmid == MMID) && VPN == tag && !tlb->EHINV) { 194 /* TLB match */ 195 env->CP0_Index = i; 196 break; 197 } 198 } 199 if (i == env->tlb->nb_tlb) { 200 /* No match. Discard any shadow entries, if any of them match. */ 201 for (i = env->tlb->nb_tlb; i < env->tlb->tlb_in_use; i++) { 202 tlb = &env->tlb->mmu.r4k.tlb[i]; 203 /* 1k pages are not supported. */ 204 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1); 205 tag = env->CP0_EntryHi & ~mask; 206 VPN = tlb->VPN & ~mask; 207 #if defined(TARGET_MIPS64) 208 tag &= env->SEGMask; 209 #endif 210 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 211 /* Check ASID/MMID, virtual page number & size */ 212 if ((tlb->G == 1 || tlb_mmid == MMID) && VPN == tag) { 213 r4k_mips_tlb_flush_extra(env, i); 214 break; 215 } 216 } 217 218 env->CP0_Index |= 0x80000000; 219 } 220 } 221 222 static inline uint64_t get_entrylo_pfn_from_tlb(uint64_t tlb_pfn) 223 { 224 #if defined(TARGET_MIPS64) 225 return tlb_pfn << 6; 226 #else 227 return (extract64(tlb_pfn, 0, 24) << 6) | /* PFN */ 228 (extract64(tlb_pfn, 24, 32) << 32); /* PFNX */ 229 #endif 230 } 231 232 static void r4k_helper_tlbr(CPUMIPSState *env) 233 { 234 bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1); 235 uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 236 uint32_t MMID = env->CP0_MemoryMapID; 237 uint32_t tlb_mmid; 238 r4k_tlb_t *tlb; 239 int idx; 240 241 MMID = mi ? MMID : (uint32_t) ASID; 242 idx = (env->CP0_Index & ~0x80000000) % env->tlb->nb_tlb; 243 tlb = &env->tlb->mmu.r4k.tlb[idx]; 244 245 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 246 /* If this will change the current ASID/MMID, flush qemu's TLB. */ 247 if (MMID != tlb_mmid) { 248 cpu_mips_tlb_flush(env); 249 } 250 251 r4k_mips_tlb_flush_extra(env, env->tlb->nb_tlb); 252 253 if (tlb->EHINV) { 254 env->CP0_EntryHi = 1 << CP0EnHi_EHINV; 255 env->CP0_PageMask = 0; 256 env->CP0_EntryLo0 = 0; 257 env->CP0_EntryLo1 = 0; 258 } else { 259 env->CP0_EntryHi = mi ? tlb->VPN : tlb->VPN | tlb->ASID; 260 env->CP0_MemoryMapID = tlb->MMID; 261 env->CP0_PageMask = tlb->PageMask; 262 env->CP0_EntryLo0 = tlb->G | (tlb->V0 << 1) | (tlb->D0 << 2) | 263 ((uint64_t)tlb->RI0 << CP0EnLo_RI) | 264 ((uint64_t)tlb->XI0 << CP0EnLo_XI) | (tlb->C0 << 3) | 265 get_entrylo_pfn_from_tlb(tlb->PFN[0] >> 12); 266 env->CP0_EntryLo1 = tlb->G | (tlb->V1 << 1) | (tlb->D1 << 2) | 267 ((uint64_t)tlb->RI1 << CP0EnLo_RI) | 268 ((uint64_t)tlb->XI1 << CP0EnLo_XI) | (tlb->C1 << 3) | 269 get_entrylo_pfn_from_tlb(tlb->PFN[1] >> 12); 270 } 271 } 272 273 void helper_tlbwi(CPUMIPSState *env) 274 { 275 env->tlb->helper_tlbwi(env); 276 } 277 278 void helper_tlbwr(CPUMIPSState *env) 279 { 280 env->tlb->helper_tlbwr(env); 281 } 282 283 void helper_tlbp(CPUMIPSState *env) 284 { 285 env->tlb->helper_tlbp(env); 286 } 287 288 void helper_tlbr(CPUMIPSState *env) 289 { 290 env->tlb->helper_tlbr(env); 291 } 292 293 void helper_tlbinv(CPUMIPSState *env) 294 { 295 env->tlb->helper_tlbinv(env); 296 } 297 298 void helper_tlbinvf(CPUMIPSState *env) 299 { 300 env->tlb->helper_tlbinvf(env); 301 } 302 303 static void global_invalidate_tlb(CPUMIPSState *env, 304 uint32_t invMsgVPN2, 305 uint8_t invMsgR, 306 uint32_t invMsgMMid, 307 bool invAll, 308 bool invVAMMid, 309 bool invMMid, 310 bool invVA) 311 { 312 313 int idx; 314 r4k_tlb_t *tlb; 315 bool VAMatch; 316 bool MMidMatch; 317 318 for (idx = 0; idx < env->tlb->nb_tlb; idx++) { 319 tlb = &env->tlb->mmu.r4k.tlb[idx]; 320 VAMatch = 321 (((tlb->VPN & ~tlb->PageMask) == (invMsgVPN2 & ~tlb->PageMask)) 322 #ifdef TARGET_MIPS64 323 && 324 (extract64(env->CP0_EntryHi, 62, 2) == invMsgR) 325 #endif 326 ); 327 MMidMatch = tlb->MMID == invMsgMMid; 328 if ((invAll && (idx > env->CP0_Wired)) || 329 (VAMatch && invVAMMid && (tlb->G || MMidMatch)) || 330 (VAMatch && invVA) || 331 (MMidMatch && !(tlb->G) && invMMid)) { 332 tlb->EHINV = 1; 333 } 334 } 335 cpu_mips_tlb_flush(env); 336 } 337 338 void helper_ginvt(CPUMIPSState *env, target_ulong arg, uint32_t type) 339 { 340 bool invAll = type == 0; 341 bool invVA = type == 1; 342 bool invMMid = type == 2; 343 bool invVAMMid = type == 3; 344 uint32_t invMsgVPN2 = arg & (TARGET_PAGE_MASK << 1); 345 uint8_t invMsgR = 0; 346 uint32_t invMsgMMid = env->CP0_MemoryMapID; 347 CPUState *other_cs = first_cpu; 348 349 #ifdef TARGET_MIPS64 350 invMsgR = extract64(arg, 62, 2); 351 #endif 352 353 CPU_FOREACH(other_cs) { 354 MIPSCPU *other_cpu = MIPS_CPU(other_cs); 355 global_invalidate_tlb(&other_cpu->env, invMsgVPN2, invMsgR, invMsgMMid, 356 invAll, invVAMMid, invMMid, invVA); 357 } 358 } 359 360 /* no MMU emulation */ 361 static int no_mmu_map_address(CPUMIPSState *env, hwaddr *physical, int *prot, 362 target_ulong address, MMUAccessType access_type) 363 { 364 *physical = address; 365 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 366 return TLBRET_MATCH; 367 } 368 369 /* fixed mapping MMU emulation */ 370 static int fixed_mmu_map_address(CPUMIPSState *env, hwaddr *physical, 371 int *prot, target_ulong address, 372 MMUAccessType access_type) 373 { 374 if (address <= (int32_t)0x7FFFFFFFUL) { 375 if (!(env->CP0_Status & (1 << CP0St_ERL))) { 376 *physical = address + 0x40000000UL; 377 } else { 378 *physical = address; 379 } 380 } else if (address <= (int32_t)0xBFFFFFFFUL) { 381 *physical = address & 0x1FFFFFFF; 382 } else { 383 *physical = address; 384 } 385 386 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 387 return TLBRET_MATCH; 388 } 389 390 /* MIPS32/MIPS64 R4000-style MMU emulation */ 391 static int r4k_map_address(CPUMIPSState *env, hwaddr *physical, int *prot, 392 target_ulong address, MMUAccessType access_type) 393 { 394 uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 395 uint32_t MMID = env->CP0_MemoryMapID; 396 bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1); 397 uint32_t tlb_mmid; 398 int i; 399 400 MMID = mi ? MMID : (uint32_t) ASID; 401 402 for (i = 0; i < env->tlb->tlb_in_use; i++) { 403 r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i]; 404 /* 1k pages are not supported. */ 405 target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1); 406 target_ulong tag = address & ~mask; 407 target_ulong VPN = tlb->VPN & ~mask; 408 #if defined(TARGET_MIPS64) 409 tag &= env->SEGMask; 410 #endif 411 412 /* Check ASID/MMID, virtual page number & size */ 413 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 414 if ((tlb->G == 1 || tlb_mmid == MMID) && VPN == tag && !tlb->EHINV) { 415 /* TLB match */ 416 int n = !!(address & mask & ~(mask >> 1)); 417 /* Check access rights */ 418 if (!(n ? tlb->V1 : tlb->V0)) { 419 return TLBRET_INVALID; 420 } 421 if (access_type == MMU_INST_FETCH && (n ? tlb->XI1 : tlb->XI0)) { 422 return TLBRET_XI; 423 } 424 if (access_type == MMU_DATA_LOAD && (n ? tlb->RI1 : tlb->RI0)) { 425 return TLBRET_RI; 426 } 427 if (access_type != MMU_DATA_STORE || (n ? tlb->D1 : tlb->D0)) { 428 *physical = tlb->PFN[n] | (address & (mask >> 1)); 429 *prot = PAGE_READ; 430 if (n ? tlb->D1 : tlb->D0) { 431 *prot |= PAGE_WRITE; 432 } 433 if (!(n ? tlb->XI1 : tlb->XI0)) { 434 *prot |= PAGE_EXEC; 435 } 436 return TLBRET_MATCH; 437 } 438 return TLBRET_DIRTY; 439 } 440 } 441 return TLBRET_NOMATCH; 442 } 443 444 static void no_mmu_init(CPUMIPSState *env, const mips_def_t *def) 445 { 446 env->tlb->nb_tlb = 1; 447 env->tlb->map_address = &no_mmu_map_address; 448 } 449 450 static void fixed_mmu_init(CPUMIPSState *env, const mips_def_t *def) 451 { 452 env->tlb->nb_tlb = 1; 453 env->tlb->map_address = &fixed_mmu_map_address; 454 } 455 456 static void r4k_mmu_init(CPUMIPSState *env, const mips_def_t *def) 457 { 458 env->tlb->nb_tlb = 1 + ((def->CP0_Config1 >> CP0C1_MMU) & 63); 459 env->tlb->map_address = &r4k_map_address; 460 env->tlb->helper_tlbwi = r4k_helper_tlbwi; 461 env->tlb->helper_tlbwr = r4k_helper_tlbwr; 462 env->tlb->helper_tlbp = r4k_helper_tlbp; 463 env->tlb->helper_tlbr = r4k_helper_tlbr; 464 env->tlb->helper_tlbinv = r4k_helper_tlbinv; 465 env->tlb->helper_tlbinvf = r4k_helper_tlbinvf; 466 } 467 468 void mmu_init(CPUMIPSState *env, const mips_def_t *def) 469 { 470 env->tlb = g_malloc0(sizeof(CPUMIPSTLBContext)); 471 472 switch (def->mmu_type) { 473 case MMU_TYPE_NONE: 474 no_mmu_init(env, def); 475 break; 476 case MMU_TYPE_R4000: 477 r4k_mmu_init(env, def); 478 break; 479 case MMU_TYPE_FMT: 480 fixed_mmu_init(env, def); 481 break; 482 case MMU_TYPE_R3000: 483 case MMU_TYPE_R6000: 484 case MMU_TYPE_R8000: 485 default: 486 cpu_abort(env_cpu(env), "MMU type not supported\n"); 487 } 488 } 489 490 void cpu_mips_tlb_flush(CPUMIPSState *env) 491 { 492 /* Flush qemu's TLB and discard all shadowed entries. */ 493 tlb_flush(env_cpu(env)); 494 env->tlb->tlb_in_use = env->tlb->nb_tlb; 495 } 496 497 static void raise_mmu_exception(CPUMIPSState *env, target_ulong address, 498 MMUAccessType access_type, int tlb_error) 499 { 500 CPUState *cs = env_cpu(env); 501 int exception = 0, error_code = 0; 502 503 if (access_type == MMU_INST_FETCH) { 504 error_code |= EXCP_INST_NOTAVAIL; 505 } 506 507 switch (tlb_error) { 508 default: 509 case TLBRET_BADADDR: 510 /* Reference to kernel address from user mode or supervisor mode */ 511 /* Reference to supervisor address from user mode */ 512 if (access_type == MMU_DATA_STORE) { 513 exception = EXCP_AdES; 514 } else { 515 exception = EXCP_AdEL; 516 } 517 break; 518 case TLBRET_NOMATCH: 519 /* No TLB match for a mapped address */ 520 if (access_type == MMU_DATA_STORE) { 521 exception = EXCP_TLBS; 522 } else { 523 exception = EXCP_TLBL; 524 } 525 error_code |= EXCP_TLB_NOMATCH; 526 break; 527 case TLBRET_INVALID: 528 /* TLB match with no valid bit */ 529 if (access_type == MMU_DATA_STORE) { 530 exception = EXCP_TLBS; 531 } else { 532 exception = EXCP_TLBL; 533 } 534 break; 535 case TLBRET_DIRTY: 536 /* TLB match but 'D' bit is cleared */ 537 exception = EXCP_LTLBL; 538 break; 539 case TLBRET_XI: 540 /* Execute-Inhibit Exception */ 541 if (env->CP0_PageGrain & (1 << CP0PG_IEC)) { 542 exception = EXCP_TLBXI; 543 } else { 544 exception = EXCP_TLBL; 545 } 546 break; 547 case TLBRET_RI: 548 /* Read-Inhibit Exception */ 549 if (env->CP0_PageGrain & (1 << CP0PG_IEC)) { 550 exception = EXCP_TLBRI; 551 } else { 552 exception = EXCP_TLBL; 553 } 554 break; 555 } 556 /* Raise exception */ 557 if (!(env->hflags & MIPS_HFLAG_DM)) { 558 env->CP0_BadVAddr = address; 559 } 560 env->CP0_Context = (env->CP0_Context & ~0x007fffff) | 561 ((address >> 9) & 0x007ffff0); 562 env->CP0_EntryHi = (env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask) | 563 (env->CP0_EntryHi & (1 << CP0EnHi_EHINV)) | 564 (address & (TARGET_PAGE_MASK << 1)); 565 #if defined(TARGET_MIPS64) 566 env->CP0_EntryHi &= env->SEGMask; 567 env->CP0_XContext = 568 (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) | /* PTEBase */ 569 (extract64(address, 62, 2) << (env->SEGBITS - 9)) | /* R */ 570 (extract64(address, 13, env->SEGBITS - 13) << 4); /* BadVPN2 */ 571 #endif 572 cs->exception_index = exception; 573 env->error_code = error_code; 574 } 575 576 #if !defined(TARGET_MIPS64) 577 578 /* 579 * Perform hardware page table walk 580 * 581 * Memory accesses are performed using the KERNEL privilege level. 582 * Synchronous exceptions detected on memory accesses cause a silent exit 583 * from page table walking, resulting in a TLB or XTLB Refill exception. 584 * 585 * Implementations are not required to support page table walk memory 586 * accesses from mapped memory regions. When an unsupported access is 587 * attempted, a silent exit is taken, resulting in a TLB or XTLB Refill 588 * exception. 589 * 590 * Note that if an exception is caused by AddressTranslation or LoadMemory 591 * functions, the exception is not taken, a silent exit is taken, 592 * resulting in a TLB or XTLB Refill exception. 593 */ 594 595 static bool get_pte(CPUMIPSState *env, uint64_t vaddr, int entry_size, 596 uint64_t *pte) 597 { 598 if ((vaddr & ((entry_size >> 3) - 1)) != 0) { 599 return false; 600 } 601 if (entry_size == 64) { 602 *pte = cpu_ldq_code(env, vaddr); 603 } else { 604 *pte = cpu_ldl_code(env, vaddr); 605 } 606 return true; 607 } 608 609 static uint64_t get_tlb_entry_layout(CPUMIPSState *env, uint64_t entry, 610 int entry_size, int ptei) 611 { 612 uint64_t result = entry; 613 uint64_t rixi; 614 if (ptei > entry_size) { 615 ptei -= 32; 616 } 617 result >>= (ptei - 2); 618 rixi = result & 3; 619 result >>= 2; 620 result |= rixi << CP0EnLo_XI; 621 return result; 622 } 623 624 static int walk_directory(CPUMIPSState *env, uint64_t *vaddr, 625 int directory_index, bool *huge_page, bool *hgpg_directory_hit, 626 uint64_t *pw_entrylo0, uint64_t *pw_entrylo1) 627 { 628 int dph = (env->CP0_PWCtl >> CP0PC_DPH) & 0x1; 629 int psn = (env->CP0_PWCtl >> CP0PC_PSN) & 0x3F; 630 int hugepg = (env->CP0_PWCtl >> CP0PC_HUGEPG) & 0x1; 631 int pf_ptew = (env->CP0_PWField >> CP0PF_PTEW) & 0x3F; 632 int ptew = (env->CP0_PWSize >> CP0PS_PTEW) & 0x3F; 633 int native_shift = (((env->CP0_PWSize >> CP0PS_PS) & 1) == 0) ? 2 : 3; 634 int directory_shift = (ptew > 1) ? -1 : 635 (hugepg && (ptew == 1)) ? native_shift + 1 : native_shift; 636 int leaf_shift = (ptew > 1) ? -1 : 637 (ptew == 1) ? native_shift + 1 : native_shift; 638 uint32_t direntry_size = 1 << (directory_shift + 3); 639 uint32_t leafentry_size = 1 << (leaf_shift + 3); 640 uint64_t entry; 641 uint64_t paddr; 642 int prot; 643 uint64_t lsb = 0; 644 uint64_t w = 0; 645 646 if (get_physical_address(env, &paddr, &prot, *vaddr, MMU_DATA_LOAD, 647 cpu_mmu_index(env, false)) != 648 TLBRET_MATCH) { 649 /* wrong base address */ 650 return 0; 651 } 652 if (!get_pte(env, *vaddr, direntry_size, &entry)) { 653 return 0; 654 } 655 656 if ((entry & (1 << psn)) && hugepg) { 657 *huge_page = true; 658 *hgpg_directory_hit = true; 659 entry = get_tlb_entry_layout(env, entry, leafentry_size, pf_ptew); 660 w = directory_index - 1; 661 if (directory_index & 0x1) { 662 /* Generate adjacent page from same PTE for odd TLB page */ 663 lsb = BIT_ULL(w) >> 6; 664 *pw_entrylo0 = entry & ~lsb; /* even page */ 665 *pw_entrylo1 = entry | lsb; /* odd page */ 666 } else if (dph) { 667 int oddpagebit = 1 << leaf_shift; 668 uint64_t vaddr2 = *vaddr ^ oddpagebit; 669 if (*vaddr & oddpagebit) { 670 *pw_entrylo1 = entry; 671 } else { 672 *pw_entrylo0 = entry; 673 } 674 if (get_physical_address(env, &paddr, &prot, vaddr2, MMU_DATA_LOAD, 675 cpu_mmu_index(env, false)) != 676 TLBRET_MATCH) { 677 return 0; 678 } 679 if (!get_pte(env, vaddr2, leafentry_size, &entry)) { 680 return 0; 681 } 682 entry = get_tlb_entry_layout(env, entry, leafentry_size, pf_ptew); 683 if (*vaddr & oddpagebit) { 684 *pw_entrylo0 = entry; 685 } else { 686 *pw_entrylo1 = entry; 687 } 688 } else { 689 return 0; 690 } 691 return 1; 692 } else { 693 *vaddr = entry; 694 return 2; 695 } 696 } 697 698 static bool page_table_walk_refill(CPUMIPSState *env, vaddr address, 699 int mmu_idx) 700 { 701 int gdw = (env->CP0_PWSize >> CP0PS_GDW) & 0x3F; 702 int udw = (env->CP0_PWSize >> CP0PS_UDW) & 0x3F; 703 int mdw = (env->CP0_PWSize >> CP0PS_MDW) & 0x3F; 704 int ptw = (env->CP0_PWSize >> CP0PS_PTW) & 0x3F; 705 int ptew = (env->CP0_PWSize >> CP0PS_PTEW) & 0x3F; 706 707 /* Initial values */ 708 bool huge_page = false; 709 bool hgpg_bdhit = false; 710 bool hgpg_gdhit = false; 711 bool hgpg_udhit = false; 712 bool hgpg_mdhit = false; 713 714 int32_t pw_pagemask = 0; 715 target_ulong pw_entryhi = 0; 716 uint64_t pw_entrylo0 = 0; 717 uint64_t pw_entrylo1 = 0; 718 719 /* Native pointer size */ 720 /*For the 32-bit architectures, this bit is fixed to 0.*/ 721 int native_shift = (((env->CP0_PWSize >> CP0PS_PS) & 1) == 0) ? 2 : 3; 722 723 /* Indices from PWField */ 724 int pf_gdw = (env->CP0_PWField >> CP0PF_GDW) & 0x3F; 725 int pf_udw = (env->CP0_PWField >> CP0PF_UDW) & 0x3F; 726 int pf_mdw = (env->CP0_PWField >> CP0PF_MDW) & 0x3F; 727 int pf_ptw = (env->CP0_PWField >> CP0PF_PTW) & 0x3F; 728 int pf_ptew = (env->CP0_PWField >> CP0PF_PTEW) & 0x3F; 729 730 /* Indices computed from faulting address */ 731 int gindex = (address >> pf_gdw) & ((1 << gdw) - 1); 732 int uindex = (address >> pf_udw) & ((1 << udw) - 1); 733 int mindex = (address >> pf_mdw) & ((1 << mdw) - 1); 734 int ptindex = (address >> pf_ptw) & ((1 << ptw) - 1); 735 736 /* Other HTW configs */ 737 int hugepg = (env->CP0_PWCtl >> CP0PC_HUGEPG) & 0x1; 738 739 /* HTW Shift values (depend on entry size) */ 740 int directory_shift = (ptew > 1) ? -1 : 741 (hugepg && (ptew == 1)) ? native_shift + 1 : native_shift; 742 int leaf_shift = (ptew > 1) ? -1 : 743 (ptew == 1) ? native_shift + 1 : native_shift; 744 745 /* Offsets into tables */ 746 int goffset = gindex << directory_shift; 747 int uoffset = uindex << directory_shift; 748 int moffset = mindex << directory_shift; 749 int ptoffset0 = (ptindex >> 1) << (leaf_shift + 1); 750 int ptoffset1 = ptoffset0 | (1 << (leaf_shift)); 751 752 uint32_t leafentry_size = 1 << (leaf_shift + 3); 753 754 /* Starting address - Page Table Base */ 755 uint64_t vaddr = env->CP0_PWBase; 756 757 uint64_t dir_entry; 758 uint64_t paddr; 759 int prot; 760 int m; 761 762 if (!(env->CP0_Config3 & (1 << CP0C3_PW))) { 763 /* walker is unimplemented */ 764 return false; 765 } 766 if (!(env->CP0_PWCtl & (1 << CP0PC_PWEN))) { 767 /* walker is disabled */ 768 return false; 769 } 770 if (!(gdw > 0 || udw > 0 || mdw > 0)) { 771 /* no structure to walk */ 772 return false; 773 } 774 if ((directory_shift == -1) || (leaf_shift == -1)) { 775 return false; 776 } 777 778 /* Global Directory */ 779 if (gdw > 0) { 780 vaddr |= goffset; 781 switch (walk_directory(env, &vaddr, pf_gdw, &huge_page, &hgpg_gdhit, 782 &pw_entrylo0, &pw_entrylo1)) 783 { 784 case 0: 785 return false; 786 case 1: 787 goto refill; 788 case 2: 789 default: 790 break; 791 } 792 } 793 794 /* Upper directory */ 795 if (udw > 0) { 796 vaddr |= uoffset; 797 switch (walk_directory(env, &vaddr, pf_udw, &huge_page, &hgpg_udhit, 798 &pw_entrylo0, &pw_entrylo1)) 799 { 800 case 0: 801 return false; 802 case 1: 803 goto refill; 804 case 2: 805 default: 806 break; 807 } 808 } 809 810 /* Middle directory */ 811 if (mdw > 0) { 812 vaddr |= moffset; 813 switch (walk_directory(env, &vaddr, pf_mdw, &huge_page, &hgpg_mdhit, 814 &pw_entrylo0, &pw_entrylo1)) 815 { 816 case 0: 817 return false; 818 case 1: 819 goto refill; 820 case 2: 821 default: 822 break; 823 } 824 } 825 826 /* Leaf Level Page Table - First half of PTE pair */ 827 vaddr |= ptoffset0; 828 if (get_physical_address(env, &paddr, &prot, vaddr, MMU_DATA_LOAD, 829 cpu_mmu_index(env, false)) != 830 TLBRET_MATCH) { 831 return false; 832 } 833 if (!get_pte(env, vaddr, leafentry_size, &dir_entry)) { 834 return false; 835 } 836 dir_entry = get_tlb_entry_layout(env, dir_entry, leafentry_size, pf_ptew); 837 pw_entrylo0 = dir_entry; 838 839 /* Leaf Level Page Table - Second half of PTE pair */ 840 vaddr |= ptoffset1; 841 if (get_physical_address(env, &paddr, &prot, vaddr, MMU_DATA_LOAD, 842 cpu_mmu_index(env, false)) != 843 TLBRET_MATCH) { 844 return false; 845 } 846 if (!get_pte(env, vaddr, leafentry_size, &dir_entry)) { 847 return false; 848 } 849 dir_entry = get_tlb_entry_layout(env, dir_entry, leafentry_size, pf_ptew); 850 pw_entrylo1 = dir_entry; 851 852 refill: 853 854 m = (1 << pf_ptw) - 1; 855 856 if (huge_page) { 857 switch (hgpg_bdhit << 3 | hgpg_gdhit << 2 | hgpg_udhit << 1 | 858 hgpg_mdhit) 859 { 860 case 4: 861 m = (1 << pf_gdw) - 1; 862 if (pf_gdw & 1) { 863 m >>= 1; 864 } 865 break; 866 case 2: 867 m = (1 << pf_udw) - 1; 868 if (pf_udw & 1) { 869 m >>= 1; 870 } 871 break; 872 case 1: 873 m = (1 << pf_mdw) - 1; 874 if (pf_mdw & 1) { 875 m >>= 1; 876 } 877 break; 878 } 879 } 880 pw_pagemask = m >> TARGET_PAGE_BITS_MIN; 881 update_pagemask(env, pw_pagemask << CP0PM_MASK, &pw_pagemask); 882 pw_entryhi = (address & ~0x1fff) | (env->CP0_EntryHi & 0xFF); 883 { 884 target_ulong tmp_entryhi = env->CP0_EntryHi; 885 int32_t tmp_pagemask = env->CP0_PageMask; 886 uint64_t tmp_entrylo0 = env->CP0_EntryLo0; 887 uint64_t tmp_entrylo1 = env->CP0_EntryLo1; 888 889 env->CP0_EntryHi = pw_entryhi; 890 env->CP0_PageMask = pw_pagemask; 891 env->CP0_EntryLo0 = pw_entrylo0; 892 env->CP0_EntryLo1 = pw_entrylo1; 893 894 /* 895 * The hardware page walker inserts a page into the TLB in a manner 896 * identical to a TLBWR instruction as executed by the software refill 897 * handler. 898 */ 899 r4k_helper_tlbwr(env); 900 901 env->CP0_EntryHi = tmp_entryhi; 902 env->CP0_PageMask = tmp_pagemask; 903 env->CP0_EntryLo0 = tmp_entrylo0; 904 env->CP0_EntryLo1 = tmp_entrylo1; 905 } 906 return true; 907 } 908 #endif 909 910 bool mips_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 911 MMUAccessType access_type, int mmu_idx, 912 bool probe, uintptr_t retaddr) 913 { 914 MIPSCPU *cpu = MIPS_CPU(cs); 915 CPUMIPSState *env = &cpu->env; 916 hwaddr physical; 917 int prot; 918 int ret = TLBRET_BADADDR; 919 920 /* data access */ 921 /* XXX: put correct access by using cpu_restore_state() correctly */ 922 ret = get_physical_address(env, &physical, &prot, address, 923 access_type, mmu_idx); 924 switch (ret) { 925 case TLBRET_MATCH: 926 qemu_log_mask(CPU_LOG_MMU, 927 "%s address=%" VADDR_PRIx " physical " TARGET_FMT_plx 928 " prot %d\n", __func__, address, physical, prot); 929 break; 930 default: 931 qemu_log_mask(CPU_LOG_MMU, 932 "%s address=%" VADDR_PRIx " ret %d\n", __func__, address, 933 ret); 934 break; 935 } 936 if (ret == TLBRET_MATCH) { 937 tlb_set_page(cs, address & TARGET_PAGE_MASK, 938 physical & TARGET_PAGE_MASK, prot, 939 mmu_idx, TARGET_PAGE_SIZE); 940 return true; 941 } 942 #if !defined(TARGET_MIPS64) 943 if ((ret == TLBRET_NOMATCH) && (env->tlb->nb_tlb > 1)) { 944 /* 945 * Memory reads during hardware page table walking are performed 946 * as if they were kernel-mode load instructions. 947 */ 948 int mode = (env->hflags & MIPS_HFLAG_KSU); 949 bool ret_walker; 950 env->hflags &= ~MIPS_HFLAG_KSU; 951 ret_walker = page_table_walk_refill(env, address, mmu_idx); 952 env->hflags |= mode; 953 if (ret_walker) { 954 ret = get_physical_address(env, &physical, &prot, address, 955 access_type, mmu_idx); 956 if (ret == TLBRET_MATCH) { 957 tlb_set_page(cs, address & TARGET_PAGE_MASK, 958 physical & TARGET_PAGE_MASK, prot, 959 mmu_idx, TARGET_PAGE_SIZE); 960 return true; 961 } 962 } 963 } 964 #endif 965 if (probe) { 966 return false; 967 } 968 969 raise_mmu_exception(env, address, access_type, ret); 970 do_raise_exception_err(env, cs->exception_index, env->error_code, retaddr); 971 } 972 973 hwaddr cpu_mips_translate_address(CPUMIPSState *env, target_ulong address, 974 MMUAccessType access_type, uintptr_t retaddr) 975 { 976 hwaddr physical; 977 int prot; 978 int ret = 0; 979 CPUState *cs = env_cpu(env); 980 981 /* data access */ 982 ret = get_physical_address(env, &physical, &prot, address, access_type, 983 cpu_mmu_index(env, false)); 984 if (ret == TLBRET_MATCH) { 985 return physical; 986 } 987 988 raise_mmu_exception(env, address, access_type, ret); 989 cpu_loop_exit_restore(cs, retaddr); 990 } 991 992 static void set_hflags_for_handler(CPUMIPSState *env) 993 { 994 /* Exception handlers are entered in 32-bit mode. */ 995 env->hflags &= ~(MIPS_HFLAG_M16); 996 /* ...except that microMIPS lets you choose. */ 997 if (env->insn_flags & ASE_MICROMIPS) { 998 env->hflags |= (!!(env->CP0_Config3 & 999 (1 << CP0C3_ISA_ON_EXC)) 1000 << MIPS_HFLAG_M16_SHIFT); 1001 } 1002 } 1003 1004 static inline void set_badinstr_registers(CPUMIPSState *env) 1005 { 1006 if (env->insn_flags & ISA_NANOMIPS32) { 1007 if (env->CP0_Config3 & (1 << CP0C3_BI)) { 1008 uint32_t instr = (cpu_lduw_code(env, env->active_tc.PC)) << 16; 1009 if ((instr & 0x10000000) == 0) { 1010 instr |= cpu_lduw_code(env, env->active_tc.PC + 2); 1011 } 1012 env->CP0_BadInstr = instr; 1013 1014 if ((instr & 0xFC000000) == 0x60000000) { 1015 instr = cpu_lduw_code(env, env->active_tc.PC + 4) << 16; 1016 env->CP0_BadInstrX = instr; 1017 } 1018 } 1019 return; 1020 } 1021 1022 if (env->hflags & MIPS_HFLAG_M16) { 1023 /* TODO: add BadInstr support for microMIPS */ 1024 return; 1025 } 1026 if (env->CP0_Config3 & (1 << CP0C3_BI)) { 1027 env->CP0_BadInstr = cpu_ldl_code(env, env->active_tc.PC); 1028 } 1029 if ((env->CP0_Config3 & (1 << CP0C3_BP)) && 1030 (env->hflags & MIPS_HFLAG_BMASK)) { 1031 env->CP0_BadInstrP = cpu_ldl_code(env, env->active_tc.PC - 4); 1032 } 1033 } 1034 1035 void mips_cpu_do_interrupt(CPUState *cs) 1036 { 1037 MIPSCPU *cpu = MIPS_CPU(cs); 1038 CPUMIPSState *env = &cpu->env; 1039 bool update_badinstr = 0; 1040 target_ulong offset; 1041 int cause = -1; 1042 1043 if (qemu_loglevel_mask(CPU_LOG_INT) 1044 && cs->exception_index != EXCP_EXT_INTERRUPT) { 1045 qemu_log("%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx 1046 " %s exception\n", 1047 __func__, env->active_tc.PC, env->CP0_EPC, 1048 mips_exception_name(cs->exception_index)); 1049 } 1050 if (cs->exception_index == EXCP_EXT_INTERRUPT && 1051 (env->hflags & MIPS_HFLAG_DM)) { 1052 cs->exception_index = EXCP_DINT; 1053 } 1054 offset = 0x180; 1055 switch (cs->exception_index) { 1056 case EXCP_DSS: 1057 env->CP0_Debug |= 1 << CP0DB_DSS; 1058 /* 1059 * Debug single step cannot be raised inside a delay slot and 1060 * resume will always occur on the next instruction 1061 * (but we assume the pc has always been updated during 1062 * code translation). 1063 */ 1064 env->CP0_DEPC = env->active_tc.PC | !!(env->hflags & MIPS_HFLAG_M16); 1065 goto enter_debug_mode; 1066 case EXCP_DINT: 1067 env->CP0_Debug |= 1 << CP0DB_DINT; 1068 goto set_DEPC; 1069 case EXCP_DIB: 1070 env->CP0_Debug |= 1 << CP0DB_DIB; 1071 goto set_DEPC; 1072 case EXCP_DBp: 1073 env->CP0_Debug |= 1 << CP0DB_DBp; 1074 /* Setup DExcCode - SDBBP instruction */ 1075 env->CP0_Debug = (env->CP0_Debug & ~(0x1fULL << CP0DB_DEC)) | 1076 (9 << CP0DB_DEC); 1077 goto set_DEPC; 1078 case EXCP_DDBS: 1079 env->CP0_Debug |= 1 << CP0DB_DDBS; 1080 goto set_DEPC; 1081 case EXCP_DDBL: 1082 env->CP0_Debug |= 1 << CP0DB_DDBL; 1083 set_DEPC: 1084 env->CP0_DEPC = exception_resume_pc(env); 1085 env->hflags &= ~MIPS_HFLAG_BMASK; 1086 enter_debug_mode: 1087 if (env->insn_flags & ISA_MIPS3) { 1088 env->hflags |= MIPS_HFLAG_64; 1089 if (!(env->insn_flags & ISA_MIPS_R6) || 1090 env->CP0_Status & (1 << CP0St_KX)) { 1091 env->hflags &= ~MIPS_HFLAG_AWRAP; 1092 } 1093 } 1094 env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_CP0; 1095 env->hflags &= ~(MIPS_HFLAG_KSU); 1096 /* EJTAG probe trap enable is not implemented... */ 1097 if (!(env->CP0_Status & (1 << CP0St_EXL))) { 1098 env->CP0_Cause &= ~(1U << CP0Ca_BD); 1099 } 1100 env->active_tc.PC = env->exception_base + 0x480; 1101 set_hflags_for_handler(env); 1102 break; 1103 case EXCP_RESET: 1104 cpu_reset(CPU(cpu)); 1105 break; 1106 case EXCP_SRESET: 1107 env->CP0_Status |= (1 << CP0St_SR); 1108 memset(env->CP0_WatchLo, 0, sizeof(env->CP0_WatchLo)); 1109 goto set_error_EPC; 1110 case EXCP_NMI: 1111 env->CP0_Status |= (1 << CP0St_NMI); 1112 set_error_EPC: 1113 env->CP0_ErrorEPC = exception_resume_pc(env); 1114 env->hflags &= ~MIPS_HFLAG_BMASK; 1115 env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV); 1116 if (env->insn_flags & ISA_MIPS3) { 1117 env->hflags |= MIPS_HFLAG_64; 1118 if (!(env->insn_flags & ISA_MIPS_R6) || 1119 env->CP0_Status & (1 << CP0St_KX)) { 1120 env->hflags &= ~MIPS_HFLAG_AWRAP; 1121 } 1122 } 1123 env->hflags |= MIPS_HFLAG_CP0; 1124 env->hflags &= ~(MIPS_HFLAG_KSU); 1125 if (!(env->CP0_Status & (1 << CP0St_EXL))) { 1126 env->CP0_Cause &= ~(1U << CP0Ca_BD); 1127 } 1128 env->active_tc.PC = env->exception_base; 1129 set_hflags_for_handler(env); 1130 break; 1131 case EXCP_EXT_INTERRUPT: 1132 cause = 0; 1133 if (env->CP0_Cause & (1 << CP0Ca_IV)) { 1134 uint32_t spacing = (env->CP0_IntCtl >> CP0IntCtl_VS) & 0x1f; 1135 1136 if ((env->CP0_Status & (1 << CP0St_BEV)) || spacing == 0) { 1137 offset = 0x200; 1138 } else { 1139 uint32_t vector = 0; 1140 uint32_t pending = (env->CP0_Cause & CP0Ca_IP_mask) >> CP0Ca_IP; 1141 1142 if (env->CP0_Config3 & (1 << CP0C3_VEIC)) { 1143 /* 1144 * For VEIC mode, the external interrupt controller feeds 1145 * the vector through the CP0Cause IP lines. 1146 */ 1147 vector = pending; 1148 } else { 1149 /* 1150 * Vectored Interrupts 1151 * Mask with Status.IM7-IM0 to get enabled interrupts. 1152 */ 1153 pending &= (env->CP0_Status >> CP0St_IM) & 0xff; 1154 /* Find the highest-priority interrupt. */ 1155 while (pending >>= 1) { 1156 vector++; 1157 } 1158 } 1159 offset = 0x200 + (vector * (spacing << 5)); 1160 } 1161 } 1162 goto set_EPC; 1163 case EXCP_LTLBL: 1164 cause = 1; 1165 update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL); 1166 goto set_EPC; 1167 case EXCP_TLBL: 1168 cause = 2; 1169 update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL); 1170 if ((env->error_code & EXCP_TLB_NOMATCH) && 1171 !(env->CP0_Status & (1 << CP0St_EXL))) { 1172 #if defined(TARGET_MIPS64) 1173 int R = env->CP0_BadVAddr >> 62; 1174 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0; 1175 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0; 1176 1177 if ((R != 0 || UX) && (R != 3 || KX) && 1178 (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) { 1179 offset = 0x080; 1180 } else { 1181 #endif 1182 offset = 0x000; 1183 #if defined(TARGET_MIPS64) 1184 } 1185 #endif 1186 } 1187 goto set_EPC; 1188 case EXCP_TLBS: 1189 cause = 3; 1190 update_badinstr = 1; 1191 if ((env->error_code & EXCP_TLB_NOMATCH) && 1192 !(env->CP0_Status & (1 << CP0St_EXL))) { 1193 #if defined(TARGET_MIPS64) 1194 int R = env->CP0_BadVAddr >> 62; 1195 int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0; 1196 int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0; 1197 1198 if ((R != 0 || UX) && (R != 3 || KX) && 1199 (!(env->insn_flags & (INSN_LOONGSON2E | INSN_LOONGSON2F)))) { 1200 offset = 0x080; 1201 } else { 1202 #endif 1203 offset = 0x000; 1204 #if defined(TARGET_MIPS64) 1205 } 1206 #endif 1207 } 1208 goto set_EPC; 1209 case EXCP_AdEL: 1210 cause = 4; 1211 update_badinstr = !(env->error_code & EXCP_INST_NOTAVAIL); 1212 goto set_EPC; 1213 case EXCP_AdES: 1214 cause = 5; 1215 update_badinstr = 1; 1216 goto set_EPC; 1217 case EXCP_IBE: 1218 cause = 6; 1219 goto set_EPC; 1220 case EXCP_DBE: 1221 cause = 7; 1222 goto set_EPC; 1223 case EXCP_SYSCALL: 1224 cause = 8; 1225 update_badinstr = 1; 1226 goto set_EPC; 1227 case EXCP_BREAK: 1228 cause = 9; 1229 update_badinstr = 1; 1230 goto set_EPC; 1231 case EXCP_RI: 1232 cause = 10; 1233 update_badinstr = 1; 1234 goto set_EPC; 1235 case EXCP_CpU: 1236 cause = 11; 1237 update_badinstr = 1; 1238 env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) | 1239 (env->error_code << CP0Ca_CE); 1240 goto set_EPC; 1241 case EXCP_OVERFLOW: 1242 cause = 12; 1243 update_badinstr = 1; 1244 goto set_EPC; 1245 case EXCP_TRAP: 1246 cause = 13; 1247 update_badinstr = 1; 1248 goto set_EPC; 1249 case EXCP_MSAFPE: 1250 cause = 14; 1251 update_badinstr = 1; 1252 goto set_EPC; 1253 case EXCP_FPE: 1254 cause = 15; 1255 update_badinstr = 1; 1256 goto set_EPC; 1257 case EXCP_C2E: 1258 cause = 18; 1259 goto set_EPC; 1260 case EXCP_TLBRI: 1261 cause = 19; 1262 update_badinstr = 1; 1263 goto set_EPC; 1264 case EXCP_TLBXI: 1265 cause = 20; 1266 goto set_EPC; 1267 case EXCP_MSADIS: 1268 cause = 21; 1269 update_badinstr = 1; 1270 goto set_EPC; 1271 case EXCP_MDMX: 1272 cause = 22; 1273 goto set_EPC; 1274 case EXCP_DWATCH: 1275 cause = 23; 1276 /* XXX: TODO: manage deferred watch exceptions */ 1277 goto set_EPC; 1278 case EXCP_MCHECK: 1279 cause = 24; 1280 goto set_EPC; 1281 case EXCP_THREAD: 1282 cause = 25; 1283 goto set_EPC; 1284 case EXCP_DSPDIS: 1285 cause = 26; 1286 goto set_EPC; 1287 case EXCP_CACHE: 1288 cause = 30; 1289 offset = 0x100; 1290 set_EPC: 1291 if (!(env->CP0_Status & (1 << CP0St_EXL))) { 1292 env->CP0_EPC = exception_resume_pc(env); 1293 if (update_badinstr) { 1294 set_badinstr_registers(env); 1295 } 1296 if (env->hflags & MIPS_HFLAG_BMASK) { 1297 env->CP0_Cause |= (1U << CP0Ca_BD); 1298 } else { 1299 env->CP0_Cause &= ~(1U << CP0Ca_BD); 1300 } 1301 env->CP0_Status |= (1 << CP0St_EXL); 1302 if (env->insn_flags & ISA_MIPS3) { 1303 env->hflags |= MIPS_HFLAG_64; 1304 if (!(env->insn_flags & ISA_MIPS_R6) || 1305 env->CP0_Status & (1 << CP0St_KX)) { 1306 env->hflags &= ~MIPS_HFLAG_AWRAP; 1307 } 1308 } 1309 env->hflags |= MIPS_HFLAG_CP0; 1310 env->hflags &= ~(MIPS_HFLAG_KSU); 1311 } 1312 env->hflags &= ~MIPS_HFLAG_BMASK; 1313 if (env->CP0_Status & (1 << CP0St_BEV)) { 1314 env->active_tc.PC = env->exception_base + 0x200; 1315 } else if (cause == 30 && !(env->CP0_Config3 & (1 << CP0C3_SC) && 1316 env->CP0_Config5 & (1 << CP0C5_CV))) { 1317 /* Force KSeg1 for cache errors */ 1318 env->active_tc.PC = KSEG1_BASE | (env->CP0_EBase & 0x1FFFF000); 1319 } else { 1320 env->active_tc.PC = env->CP0_EBase & ~0xfff; 1321 } 1322 1323 env->active_tc.PC += offset; 1324 set_hflags_for_handler(env); 1325 env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | 1326 (cause << CP0Ca_EC); 1327 break; 1328 default: 1329 abort(); 1330 } 1331 if (qemu_loglevel_mask(CPU_LOG_INT) 1332 && cs->exception_index != EXCP_EXT_INTERRUPT) { 1333 qemu_log("%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n" 1334 " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n", 1335 __func__, env->active_tc.PC, env->CP0_EPC, cause, 1336 env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr, 1337 env->CP0_DEPC); 1338 } 1339 cs->exception_index = EXCP_NONE; 1340 } 1341 1342 bool mips_cpu_exec_interrupt(CPUState *cs, int interrupt_request) 1343 { 1344 if (interrupt_request & CPU_INTERRUPT_HARD) { 1345 MIPSCPU *cpu = MIPS_CPU(cs); 1346 CPUMIPSState *env = &cpu->env; 1347 1348 if (cpu_mips_hw_interrupts_enabled(env) && 1349 cpu_mips_hw_interrupts_pending(env)) { 1350 /* Raise it */ 1351 cs->exception_index = EXCP_EXT_INTERRUPT; 1352 env->error_code = 0; 1353 mips_cpu_do_interrupt(cs); 1354 return true; 1355 } 1356 } 1357 return false; 1358 } 1359 1360 void r4k_invalidate_tlb(CPUMIPSState *env, int idx, int use_extra) 1361 { 1362 CPUState *cs = env_cpu(env); 1363 r4k_tlb_t *tlb; 1364 target_ulong addr; 1365 target_ulong end; 1366 uint16_t ASID = env->CP0_EntryHi & env->CP0_EntryHi_ASID_mask; 1367 uint32_t MMID = env->CP0_MemoryMapID; 1368 bool mi = !!((env->CP0_Config5 >> CP0C5_MI) & 1); 1369 uint32_t tlb_mmid; 1370 target_ulong mask; 1371 1372 MMID = mi ? MMID : (uint32_t) ASID; 1373 1374 tlb = &env->tlb->mmu.r4k.tlb[idx]; 1375 /* 1376 * The qemu TLB is flushed when the ASID/MMID changes, so no need to 1377 * flush these entries again. 1378 */ 1379 tlb_mmid = mi ? tlb->MMID : (uint32_t) tlb->ASID; 1380 if (tlb->G == 0 && tlb_mmid != MMID) { 1381 return; 1382 } 1383 1384 if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) { 1385 /* 1386 * For tlbwr, we can shadow the discarded entry into 1387 * a new (fake) TLB entry, as long as the guest can not 1388 * tell that it's there. 1389 */ 1390 env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb; 1391 env->tlb->tlb_in_use++; 1392 return; 1393 } 1394 1395 /* 1k pages are not supported. */ 1396 mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1); 1397 if (tlb->V0) { 1398 addr = tlb->VPN & ~mask; 1399 #if defined(TARGET_MIPS64) 1400 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) { 1401 addr |= 0x3FFFFF0000000000ULL; 1402 } 1403 #endif 1404 end = addr | (mask >> 1); 1405 while (addr < end) { 1406 tlb_flush_page(cs, addr); 1407 addr += TARGET_PAGE_SIZE; 1408 } 1409 } 1410 if (tlb->V1) { 1411 addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1); 1412 #if defined(TARGET_MIPS64) 1413 if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) { 1414 addr |= 0x3FFFFF0000000000ULL; 1415 } 1416 #endif 1417 end = addr | mask; 1418 while (addr - 1 < end) { 1419 tlb_flush_page(cs, addr); 1420 addr += TARGET_PAGE_SIZE; 1421 } 1422 } 1423 } 1424