1 /* 2 * RISC-V CPU helpers for qemu. 3 * 4 * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu 5 * Copyright (c) 2017-2018 SiFive, Inc. 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms and conditions of the GNU General Public License, 9 * version 2 or later, as published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 14 * more details. 15 * 16 * You should have received a copy of the GNU General Public License along with 17 * this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/log.h" 22 #include "qemu/main-loop.h" 23 #include "cpu.h" 24 #include "exec/exec-all.h" 25 #include "tcg/tcg-op.h" 26 #include "trace.h" 27 #include "hw/semihosting/common-semi.h" 28 29 int riscv_cpu_mmu_index(CPURISCVState *env, bool ifetch) 30 { 31 #ifdef CONFIG_USER_ONLY 32 return 0; 33 #else 34 return env->priv; 35 #endif 36 } 37 38 #ifndef CONFIG_USER_ONLY 39 static int riscv_cpu_local_irq_pending(CPURISCVState *env) 40 { 41 target_ulong irqs; 42 43 target_ulong mstatus_mie = get_field(env->mstatus, MSTATUS_MIE); 44 target_ulong mstatus_sie = get_field(env->mstatus, MSTATUS_SIE); 45 target_ulong hs_mstatus_sie = get_field(env->mstatus_hs, MSTATUS_SIE); 46 47 target_ulong pending = env->mip & env->mie & 48 ~(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP); 49 target_ulong vspending = (env->mip & env->mie & 50 (MIP_VSSIP | MIP_VSTIP | MIP_VSEIP)); 51 52 target_ulong mie = env->priv < PRV_M || 53 (env->priv == PRV_M && mstatus_mie); 54 target_ulong sie = env->priv < PRV_S || 55 (env->priv == PRV_S && mstatus_sie); 56 target_ulong hs_sie = env->priv < PRV_S || 57 (env->priv == PRV_S && hs_mstatus_sie); 58 59 if (riscv_cpu_virt_enabled(env)) { 60 target_ulong pending_hs_irq = pending & -hs_sie; 61 62 if (pending_hs_irq) { 63 riscv_cpu_set_force_hs_excep(env, FORCE_HS_EXCEP); 64 return ctz64(pending_hs_irq); 65 } 66 67 pending = vspending; 68 } 69 70 irqs = (pending & ~env->mideleg & -mie) | (pending & env->mideleg & -sie); 71 72 if (irqs) { 73 return ctz64(irqs); /* since non-zero */ 74 } else { 75 return EXCP_NONE; /* indicates no pending interrupt */ 76 } 77 } 78 #endif 79 80 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request) 81 { 82 #if !defined(CONFIG_USER_ONLY) 83 if (interrupt_request & CPU_INTERRUPT_HARD) { 84 RISCVCPU *cpu = RISCV_CPU(cs); 85 CPURISCVState *env = &cpu->env; 86 int interruptno = riscv_cpu_local_irq_pending(env); 87 if (interruptno >= 0) { 88 cs->exception_index = RISCV_EXCP_INT_FLAG | interruptno; 89 riscv_cpu_do_interrupt(cs); 90 return true; 91 } 92 } 93 #endif 94 return false; 95 } 96 97 #if !defined(CONFIG_USER_ONLY) 98 99 /* Return true is floating point support is currently enabled */ 100 bool riscv_cpu_fp_enabled(CPURISCVState *env) 101 { 102 if (env->mstatus & MSTATUS_FS) { 103 if (riscv_cpu_virt_enabled(env) && !(env->mstatus_hs & MSTATUS_FS)) { 104 return false; 105 } 106 return true; 107 } 108 109 return false; 110 } 111 112 void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env) 113 { 114 uint64_t mstatus_mask = MSTATUS_MXR | MSTATUS_SUM | MSTATUS_FS | 115 MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE | 116 MSTATUS64_UXL; 117 bool current_virt = riscv_cpu_virt_enabled(env); 118 119 g_assert(riscv_has_ext(env, RVH)); 120 121 if (current_virt) { 122 /* Current V=1 and we are about to change to V=0 */ 123 env->vsstatus = env->mstatus & mstatus_mask; 124 env->mstatus &= ~mstatus_mask; 125 env->mstatus |= env->mstatus_hs; 126 127 env->vstvec = env->stvec; 128 env->stvec = env->stvec_hs; 129 130 env->vsscratch = env->sscratch; 131 env->sscratch = env->sscratch_hs; 132 133 env->vsepc = env->sepc; 134 env->sepc = env->sepc_hs; 135 136 env->vscause = env->scause; 137 env->scause = env->scause_hs; 138 139 env->vstval = env->sbadaddr; 140 env->sbadaddr = env->stval_hs; 141 142 env->vsatp = env->satp; 143 env->satp = env->satp_hs; 144 } else { 145 /* Current V=0 and we are about to change to V=1 */ 146 env->mstatus_hs = env->mstatus & mstatus_mask; 147 env->mstatus &= ~mstatus_mask; 148 env->mstatus |= env->vsstatus; 149 150 env->stvec_hs = env->stvec; 151 env->stvec = env->vstvec; 152 153 env->sscratch_hs = env->sscratch; 154 env->sscratch = env->vsscratch; 155 156 env->sepc_hs = env->sepc; 157 env->sepc = env->vsepc; 158 159 env->scause_hs = env->scause; 160 env->scause = env->vscause; 161 162 env->stval_hs = env->sbadaddr; 163 env->sbadaddr = env->vstval; 164 165 env->satp_hs = env->satp; 166 env->satp = env->vsatp; 167 } 168 } 169 170 bool riscv_cpu_virt_enabled(CPURISCVState *env) 171 { 172 if (!riscv_has_ext(env, RVH)) { 173 return false; 174 } 175 176 return get_field(env->virt, VIRT_ONOFF); 177 } 178 179 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable) 180 { 181 if (!riscv_has_ext(env, RVH)) { 182 return; 183 } 184 185 /* Flush the TLB on all virt mode changes. */ 186 if (get_field(env->virt, VIRT_ONOFF) != enable) { 187 tlb_flush(env_cpu(env)); 188 } 189 190 env->virt = set_field(env->virt, VIRT_ONOFF, enable); 191 } 192 193 bool riscv_cpu_force_hs_excep_enabled(CPURISCVState *env) 194 { 195 if (!riscv_has_ext(env, RVH)) { 196 return false; 197 } 198 199 return get_field(env->virt, FORCE_HS_EXCEP); 200 } 201 202 void riscv_cpu_set_force_hs_excep(CPURISCVState *env, bool enable) 203 { 204 if (!riscv_has_ext(env, RVH)) { 205 return; 206 } 207 208 env->virt = set_field(env->virt, FORCE_HS_EXCEP, enable); 209 } 210 211 bool riscv_cpu_two_stage_lookup(int mmu_idx) 212 { 213 return mmu_idx & TB_FLAGS_PRIV_HYP_ACCESS_MASK; 214 } 215 216 int riscv_cpu_claim_interrupts(RISCVCPU *cpu, uint32_t interrupts) 217 { 218 CPURISCVState *env = &cpu->env; 219 if (env->miclaim & interrupts) { 220 return -1; 221 } else { 222 env->miclaim |= interrupts; 223 return 0; 224 } 225 } 226 227 uint32_t riscv_cpu_update_mip(RISCVCPU *cpu, uint32_t mask, uint32_t value) 228 { 229 CPURISCVState *env = &cpu->env; 230 CPUState *cs = CPU(cpu); 231 uint32_t old = env->mip; 232 bool locked = false; 233 234 if (!qemu_mutex_iothread_locked()) { 235 locked = true; 236 qemu_mutex_lock_iothread(); 237 } 238 239 env->mip = (env->mip & ~mask) | (value & mask); 240 241 if (env->mip) { 242 cpu_interrupt(cs, CPU_INTERRUPT_HARD); 243 } else { 244 cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD); 245 } 246 247 if (locked) { 248 qemu_mutex_unlock_iothread(); 249 } 250 251 return old; 252 } 253 254 void riscv_cpu_set_rdtime_fn(CPURISCVState *env, uint64_t (*fn)(uint32_t), 255 uint32_t arg) 256 { 257 env->rdtime_fn = fn; 258 env->rdtime_fn_arg = arg; 259 } 260 261 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv) 262 { 263 if (newpriv > PRV_M) { 264 g_assert_not_reached(); 265 } 266 if (newpriv == PRV_H) { 267 newpriv = PRV_U; 268 } 269 /* tlb_flush is unnecessary as mode is contained in mmu_idx */ 270 env->priv = newpriv; 271 272 /* 273 * Clear the load reservation - otherwise a reservation placed in one 274 * context/process can be used by another, resulting in an SC succeeding 275 * incorrectly. Version 2.2 of the ISA specification explicitly requires 276 * this behaviour, while later revisions say that the kernel "should" use 277 * an SC instruction to force the yielding of a load reservation on a 278 * preemptive context switch. As a result, do both. 279 */ 280 env->load_res = -1; 281 } 282 283 /* get_physical_address - get the physical address for this virtual address 284 * 285 * Do a page table walk to obtain the physical address corresponding to a 286 * virtual address. Returns 0 if the translation was successful 287 * 288 * Adapted from Spike's mmu_t::translate and mmu_t::walk 289 * 290 * @env: CPURISCVState 291 * @physical: This will be set to the calculated physical address 292 * @prot: The returned protection attributes 293 * @addr: The virtual address to be translated 294 * @fault_pte_addr: If not NULL, this will be set to fault pte address 295 * when a error occurs on pte address translation. 296 * This will already be shifted to match htval. 297 * @access_type: The type of MMU access 298 * @mmu_idx: Indicates current privilege level 299 * @first_stage: Are we in first stage translation? 300 * Second stage is used for hypervisor guest translation 301 * @two_stage: Are we going to perform two stage translation 302 */ 303 static int get_physical_address(CPURISCVState *env, hwaddr *physical, 304 int *prot, target_ulong addr, 305 target_ulong *fault_pte_addr, 306 int access_type, int mmu_idx, 307 bool first_stage, bool two_stage) 308 { 309 /* NOTE: the env->pc value visible here will not be 310 * correct, but the value visible to the exception handler 311 * (riscv_cpu_do_interrupt) is correct */ 312 MemTxResult res; 313 MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; 314 int mode = mmu_idx & TB_FLAGS_PRIV_MMU_MASK; 315 bool use_background = false; 316 317 /* 318 * Check if we should use the background registers for the two 319 * stage translation. We don't need to check if we actually need 320 * two stage translation as that happened before this function 321 * was called. Background registers will be used if the guest has 322 * forced a two stage translation to be on (in HS or M mode). 323 */ 324 if (!riscv_cpu_virt_enabled(env) && riscv_cpu_two_stage_lookup(mmu_idx)) { 325 use_background = true; 326 } 327 328 if (mode == PRV_M && access_type != MMU_INST_FETCH) { 329 if (get_field(env->mstatus, MSTATUS_MPRV)) { 330 mode = get_field(env->mstatus, MSTATUS_MPP); 331 } 332 } 333 334 if (first_stage == false) { 335 /* We are in stage 2 translation, this is similar to stage 1. */ 336 /* Stage 2 is always taken as U-mode */ 337 mode = PRV_U; 338 } 339 340 if (mode == PRV_M || !riscv_feature(env, RISCV_FEATURE_MMU)) { 341 *physical = addr; 342 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 343 return TRANSLATE_SUCCESS; 344 } 345 346 *prot = 0; 347 348 hwaddr base; 349 int levels, ptidxbits, ptesize, vm, sum, mxr, widened; 350 351 if (first_stage == true) { 352 mxr = get_field(env->mstatus, MSTATUS_MXR); 353 } else { 354 mxr = get_field(env->vsstatus, MSTATUS_MXR); 355 } 356 357 if (first_stage == true) { 358 if (use_background) { 359 base = (hwaddr)get_field(env->vsatp, SATP_PPN) << PGSHIFT; 360 vm = get_field(env->vsatp, SATP_MODE); 361 } else { 362 base = (hwaddr)get_field(env->satp, SATP_PPN) << PGSHIFT; 363 vm = get_field(env->satp, SATP_MODE); 364 } 365 widened = 0; 366 } else { 367 base = (hwaddr)get_field(env->hgatp, HGATP_PPN) << PGSHIFT; 368 vm = get_field(env->hgatp, HGATP_MODE); 369 widened = 2; 370 } 371 /* status.SUM will be ignored if execute on background */ 372 sum = get_field(env->mstatus, MSTATUS_SUM) || use_background; 373 switch (vm) { 374 case VM_1_10_SV32: 375 levels = 2; ptidxbits = 10; ptesize = 4; break; 376 case VM_1_10_SV39: 377 levels = 3; ptidxbits = 9; ptesize = 8; break; 378 case VM_1_10_SV48: 379 levels = 4; ptidxbits = 9; ptesize = 8; break; 380 case VM_1_10_SV57: 381 levels = 5; ptidxbits = 9; ptesize = 8; break; 382 case VM_1_10_MBARE: 383 *physical = addr; 384 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 385 return TRANSLATE_SUCCESS; 386 default: 387 g_assert_not_reached(); 388 } 389 390 CPUState *cs = env_cpu(env); 391 int va_bits = PGSHIFT + levels * ptidxbits + widened; 392 target_ulong mask, masked_msbs; 393 394 if (TARGET_LONG_BITS > (va_bits - 1)) { 395 mask = (1L << (TARGET_LONG_BITS - (va_bits - 1))) - 1; 396 } else { 397 mask = 0; 398 } 399 masked_msbs = (addr >> (va_bits - 1)) & mask; 400 401 if (masked_msbs != 0 && masked_msbs != mask) { 402 return TRANSLATE_FAIL; 403 } 404 405 int ptshift = (levels - 1) * ptidxbits; 406 int i; 407 408 #if !TCG_OVERSIZED_GUEST 409 restart: 410 #endif 411 for (i = 0; i < levels; i++, ptshift -= ptidxbits) { 412 target_ulong idx; 413 if (i == 0) { 414 idx = (addr >> (PGSHIFT + ptshift)) & 415 ((1 << (ptidxbits + widened)) - 1); 416 } else { 417 idx = (addr >> (PGSHIFT + ptshift)) & 418 ((1 << ptidxbits) - 1); 419 } 420 421 /* check that physical address of PTE is legal */ 422 hwaddr pte_addr; 423 424 if (two_stage && first_stage) { 425 int vbase_prot; 426 hwaddr vbase; 427 428 /* Do the second stage translation on the base PTE address. */ 429 int vbase_ret = get_physical_address(env, &vbase, &vbase_prot, 430 base, NULL, MMU_DATA_LOAD, 431 mmu_idx, false, true); 432 433 if (vbase_ret != TRANSLATE_SUCCESS) { 434 if (fault_pte_addr) { 435 *fault_pte_addr = (base + idx * ptesize) >> 2; 436 } 437 return TRANSLATE_G_STAGE_FAIL; 438 } 439 440 pte_addr = vbase + idx * ptesize; 441 } else { 442 pte_addr = base + idx * ptesize; 443 } 444 445 if (riscv_feature(env, RISCV_FEATURE_PMP) && 446 !pmp_hart_has_privs(env, pte_addr, sizeof(target_ulong), 447 1 << MMU_DATA_LOAD, PRV_S)) { 448 return TRANSLATE_PMP_FAIL; 449 } 450 451 target_ulong pte; 452 if (riscv_cpu_is_32bit(env)) { 453 pte = address_space_ldl(cs->as, pte_addr, attrs, &res); 454 } else { 455 pte = address_space_ldq(cs->as, pte_addr, attrs, &res); 456 } 457 458 if (res != MEMTX_OK) { 459 return TRANSLATE_FAIL; 460 } 461 462 hwaddr ppn = pte >> PTE_PPN_SHIFT; 463 464 if (!(pte & PTE_V)) { 465 /* Invalid PTE */ 466 return TRANSLATE_FAIL; 467 } else if (!(pte & (PTE_R | PTE_W | PTE_X))) { 468 /* Inner PTE, continue walking */ 469 base = ppn << PGSHIFT; 470 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) { 471 /* Reserved leaf PTE flags: PTE_W */ 472 return TRANSLATE_FAIL; 473 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == (PTE_W | PTE_X)) { 474 /* Reserved leaf PTE flags: PTE_W + PTE_X */ 475 return TRANSLATE_FAIL; 476 } else if ((pte & PTE_U) && ((mode != PRV_U) && 477 (!sum || access_type == MMU_INST_FETCH))) { 478 /* User PTE flags when not U mode and mstatus.SUM is not set, 479 or the access type is an instruction fetch */ 480 return TRANSLATE_FAIL; 481 } else if (!(pte & PTE_U) && (mode != PRV_S)) { 482 /* Supervisor PTE flags when not S mode */ 483 return TRANSLATE_FAIL; 484 } else if (ppn & ((1ULL << ptshift) - 1)) { 485 /* Misaligned PPN */ 486 return TRANSLATE_FAIL; 487 } else if (access_type == MMU_DATA_LOAD && !((pte & PTE_R) || 488 ((pte & PTE_X) && mxr))) { 489 /* Read access check failed */ 490 return TRANSLATE_FAIL; 491 } else if (access_type == MMU_DATA_STORE && !(pte & PTE_W)) { 492 /* Write access check failed */ 493 return TRANSLATE_FAIL; 494 } else if (access_type == MMU_INST_FETCH && !(pte & PTE_X)) { 495 /* Fetch access check failed */ 496 return TRANSLATE_FAIL; 497 } else { 498 /* if necessary, set accessed and dirty bits. */ 499 target_ulong updated_pte = pte | PTE_A | 500 (access_type == MMU_DATA_STORE ? PTE_D : 0); 501 502 /* Page table updates need to be atomic with MTTCG enabled */ 503 if (updated_pte != pte) { 504 /* 505 * - if accessed or dirty bits need updating, and the PTE is 506 * in RAM, then we do so atomically with a compare and swap. 507 * - if the PTE is in IO space or ROM, then it can't be updated 508 * and we return TRANSLATE_FAIL. 509 * - if the PTE changed by the time we went to update it, then 510 * it is no longer valid and we must re-walk the page table. 511 */ 512 MemoryRegion *mr; 513 hwaddr l = sizeof(target_ulong), addr1; 514 mr = address_space_translate(cs->as, pte_addr, 515 &addr1, &l, false, MEMTXATTRS_UNSPECIFIED); 516 if (memory_region_is_ram(mr)) { 517 target_ulong *pte_pa = 518 qemu_map_ram_ptr(mr->ram_block, addr1); 519 #if TCG_OVERSIZED_GUEST 520 /* MTTCG is not enabled on oversized TCG guests so 521 * page table updates do not need to be atomic */ 522 *pte_pa = pte = updated_pte; 523 #else 524 target_ulong old_pte = 525 qatomic_cmpxchg(pte_pa, pte, updated_pte); 526 if (old_pte != pte) { 527 goto restart; 528 } else { 529 pte = updated_pte; 530 } 531 #endif 532 } else { 533 /* misconfigured PTE in ROM (AD bits are not preset) or 534 * PTE is in IO space and can't be updated atomically */ 535 return TRANSLATE_FAIL; 536 } 537 } 538 539 /* for superpage mappings, make a fake leaf PTE for the TLB's 540 benefit. */ 541 target_ulong vpn = addr >> PGSHIFT; 542 *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) | 543 (addr & ~TARGET_PAGE_MASK); 544 545 /* set permissions on the TLB entry */ 546 if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) { 547 *prot |= PAGE_READ; 548 } 549 if ((pte & PTE_X)) { 550 *prot |= PAGE_EXEC; 551 } 552 /* add write permission on stores or if the page is already dirty, 553 so that we TLB miss on later writes to update the dirty bit */ 554 if ((pte & PTE_W) && 555 (access_type == MMU_DATA_STORE || (pte & PTE_D))) { 556 *prot |= PAGE_WRITE; 557 } 558 return TRANSLATE_SUCCESS; 559 } 560 } 561 return TRANSLATE_FAIL; 562 } 563 564 static void raise_mmu_exception(CPURISCVState *env, target_ulong address, 565 MMUAccessType access_type, bool pmp_violation, 566 bool first_stage, bool two_stage) 567 { 568 CPUState *cs = env_cpu(env); 569 int page_fault_exceptions; 570 if (first_stage) { 571 page_fault_exceptions = 572 get_field(env->satp, SATP_MODE) != VM_1_10_MBARE && 573 !pmp_violation; 574 } else { 575 page_fault_exceptions = 576 get_field(env->hgatp, HGATP_MODE) != VM_1_10_MBARE && 577 !pmp_violation; 578 } 579 switch (access_type) { 580 case MMU_INST_FETCH: 581 if (riscv_cpu_virt_enabled(env) && !first_stage) { 582 cs->exception_index = RISCV_EXCP_INST_GUEST_PAGE_FAULT; 583 } else { 584 cs->exception_index = page_fault_exceptions ? 585 RISCV_EXCP_INST_PAGE_FAULT : RISCV_EXCP_INST_ACCESS_FAULT; 586 } 587 break; 588 case MMU_DATA_LOAD: 589 if (two_stage && !first_stage) { 590 cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT; 591 } else { 592 cs->exception_index = page_fault_exceptions ? 593 RISCV_EXCP_LOAD_PAGE_FAULT : RISCV_EXCP_LOAD_ACCESS_FAULT; 594 } 595 break; 596 case MMU_DATA_STORE: 597 if (two_stage && !first_stage) { 598 cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT; 599 } else { 600 cs->exception_index = page_fault_exceptions ? 601 RISCV_EXCP_STORE_PAGE_FAULT : RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 602 } 603 break; 604 default: 605 g_assert_not_reached(); 606 } 607 env->badaddr = address; 608 } 609 610 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) 611 { 612 RISCVCPU *cpu = RISCV_CPU(cs); 613 CPURISCVState *env = &cpu->env; 614 hwaddr phys_addr; 615 int prot; 616 int mmu_idx = cpu_mmu_index(&cpu->env, false); 617 618 if (get_physical_address(env, &phys_addr, &prot, addr, NULL, 0, mmu_idx, 619 true, riscv_cpu_virt_enabled(env))) { 620 return -1; 621 } 622 623 if (riscv_cpu_virt_enabled(env)) { 624 if (get_physical_address(env, &phys_addr, &prot, phys_addr, NULL, 625 0, mmu_idx, false, true)) { 626 return -1; 627 } 628 } 629 630 return phys_addr & TARGET_PAGE_MASK; 631 } 632 633 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, 634 vaddr addr, unsigned size, 635 MMUAccessType access_type, 636 int mmu_idx, MemTxAttrs attrs, 637 MemTxResult response, uintptr_t retaddr) 638 { 639 RISCVCPU *cpu = RISCV_CPU(cs); 640 CPURISCVState *env = &cpu->env; 641 642 if (access_type == MMU_DATA_STORE) { 643 cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 644 } else { 645 cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; 646 } 647 648 env->badaddr = addr; 649 riscv_raise_exception(&cpu->env, cs->exception_index, retaddr); 650 } 651 652 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 653 MMUAccessType access_type, int mmu_idx, 654 uintptr_t retaddr) 655 { 656 RISCVCPU *cpu = RISCV_CPU(cs); 657 CPURISCVState *env = &cpu->env; 658 switch (access_type) { 659 case MMU_INST_FETCH: 660 cs->exception_index = RISCV_EXCP_INST_ADDR_MIS; 661 break; 662 case MMU_DATA_LOAD: 663 cs->exception_index = RISCV_EXCP_LOAD_ADDR_MIS; 664 break; 665 case MMU_DATA_STORE: 666 cs->exception_index = RISCV_EXCP_STORE_AMO_ADDR_MIS; 667 break; 668 default: 669 g_assert_not_reached(); 670 } 671 env->badaddr = addr; 672 riscv_raise_exception(env, cs->exception_index, retaddr); 673 } 674 #endif 675 676 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 677 MMUAccessType access_type, int mmu_idx, 678 bool probe, uintptr_t retaddr) 679 { 680 RISCVCPU *cpu = RISCV_CPU(cs); 681 CPURISCVState *env = &cpu->env; 682 #ifndef CONFIG_USER_ONLY 683 vaddr im_address; 684 hwaddr pa = 0; 685 int prot, prot2; 686 bool pmp_violation = false; 687 bool first_stage_error = true; 688 bool two_stage_lookup = false; 689 int ret = TRANSLATE_FAIL; 690 int mode = mmu_idx; 691 target_ulong tlb_size = 0; 692 693 env->guest_phys_fault_addr = 0; 694 695 qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n", 696 __func__, address, access_type, mmu_idx); 697 698 if (mode == PRV_M && access_type != MMU_INST_FETCH) { 699 if (get_field(env->mstatus, MSTATUS_MPRV)) { 700 mode = get_field(env->mstatus, MSTATUS_MPP); 701 } 702 } 703 704 if (riscv_has_ext(env, RVH) && env->priv == PRV_M && 705 access_type != MMU_INST_FETCH && 706 get_field(env->mstatus, MSTATUS_MPRV) && 707 get_field(env->mstatus, MSTATUS_MPV)) { 708 two_stage_lookup = true; 709 } 710 711 if (riscv_cpu_virt_enabled(env) || 712 ((riscv_cpu_two_stage_lookup(mmu_idx) || two_stage_lookup) && 713 access_type != MMU_INST_FETCH)) { 714 /* Two stage lookup */ 715 ret = get_physical_address(env, &pa, &prot, address, 716 &env->guest_phys_fault_addr, access_type, 717 mmu_idx, true, true); 718 719 /* 720 * A G-stage exception may be triggered during two state lookup. 721 * And the env->guest_phys_fault_addr has already been set in 722 * get_physical_address(). 723 */ 724 if (ret == TRANSLATE_G_STAGE_FAIL) { 725 first_stage_error = false; 726 access_type = MMU_DATA_LOAD; 727 } 728 729 qemu_log_mask(CPU_LOG_MMU, 730 "%s 1st-stage address=%" VADDR_PRIx " ret %d physical " 731 TARGET_FMT_plx " prot %d\n", 732 __func__, address, ret, pa, prot); 733 734 if (ret == TRANSLATE_SUCCESS) { 735 /* Second stage lookup */ 736 im_address = pa; 737 738 ret = get_physical_address(env, &pa, &prot2, im_address, NULL, 739 access_type, mmu_idx, false, true); 740 741 qemu_log_mask(CPU_LOG_MMU, 742 "%s 2nd-stage address=%" VADDR_PRIx " ret %d physical " 743 TARGET_FMT_plx " prot %d\n", 744 __func__, im_address, ret, pa, prot2); 745 746 prot &= prot2; 747 748 if (riscv_feature(env, RISCV_FEATURE_PMP) && 749 (ret == TRANSLATE_SUCCESS) && 750 !pmp_hart_has_privs(env, pa, size, 1 << access_type, mode)) { 751 ret = TRANSLATE_PMP_FAIL; 752 } 753 754 if (ret != TRANSLATE_SUCCESS) { 755 /* 756 * Guest physical address translation failed, this is a HS 757 * level exception 758 */ 759 first_stage_error = false; 760 env->guest_phys_fault_addr = (im_address | 761 (address & 762 (TARGET_PAGE_SIZE - 1))) >> 2; 763 } 764 } 765 } else { 766 /* Single stage lookup */ 767 ret = get_physical_address(env, &pa, &prot, address, NULL, 768 access_type, mmu_idx, true, false); 769 770 qemu_log_mask(CPU_LOG_MMU, 771 "%s address=%" VADDR_PRIx " ret %d physical " 772 TARGET_FMT_plx " prot %d\n", 773 __func__, address, ret, pa, prot); 774 } 775 776 if (riscv_feature(env, RISCV_FEATURE_PMP) && 777 (ret == TRANSLATE_SUCCESS) && 778 !pmp_hart_has_privs(env, pa, size, 1 << access_type, mode)) { 779 ret = TRANSLATE_PMP_FAIL; 780 } 781 if (ret == TRANSLATE_PMP_FAIL) { 782 pmp_violation = true; 783 } 784 785 if (ret == TRANSLATE_SUCCESS) { 786 if (pmp_is_range_in_tlb(env, pa & TARGET_PAGE_MASK, &tlb_size)) { 787 tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1), 788 prot, mmu_idx, tlb_size); 789 } else { 790 tlb_set_page(cs, address & TARGET_PAGE_MASK, pa & TARGET_PAGE_MASK, 791 prot, mmu_idx, TARGET_PAGE_SIZE); 792 } 793 return true; 794 } else if (probe) { 795 return false; 796 } else { 797 raise_mmu_exception(env, address, access_type, pmp_violation, 798 first_stage_error, 799 riscv_cpu_virt_enabled(env) || 800 riscv_cpu_two_stage_lookup(mmu_idx)); 801 riscv_raise_exception(env, cs->exception_index, retaddr); 802 } 803 804 return true; 805 806 #else 807 switch (access_type) { 808 case MMU_INST_FETCH: 809 cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT; 810 break; 811 case MMU_DATA_LOAD: 812 cs->exception_index = RISCV_EXCP_LOAD_PAGE_FAULT; 813 break; 814 case MMU_DATA_STORE: 815 cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT; 816 break; 817 default: 818 g_assert_not_reached(); 819 } 820 env->badaddr = address; 821 cpu_loop_exit_restore(cs, retaddr); 822 #endif 823 } 824 825 /* 826 * Handle Traps 827 * 828 * Adapted from Spike's processor_t::take_trap. 829 * 830 */ 831 void riscv_cpu_do_interrupt(CPUState *cs) 832 { 833 #if !defined(CONFIG_USER_ONLY) 834 835 RISCVCPU *cpu = RISCV_CPU(cs); 836 CPURISCVState *env = &cpu->env; 837 bool force_hs_execp = riscv_cpu_force_hs_excep_enabled(env); 838 uint64_t s; 839 840 /* cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide 841 * so we mask off the MSB and separate into trap type and cause. 842 */ 843 bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG); 844 target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK; 845 target_ulong deleg = async ? env->mideleg : env->medeleg; 846 bool write_tval = false; 847 target_ulong tval = 0; 848 target_ulong htval = 0; 849 target_ulong mtval2 = 0; 850 851 if (cause == RISCV_EXCP_SEMIHOST) { 852 if (env->priv >= PRV_S) { 853 env->gpr[xA0] = do_common_semihosting(cs); 854 env->pc += 4; 855 return; 856 } 857 cause = RISCV_EXCP_BREAKPOINT; 858 } 859 860 if (!async) { 861 /* set tval to badaddr for traps with address information */ 862 switch (cause) { 863 case RISCV_EXCP_INST_GUEST_PAGE_FAULT: 864 case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: 865 case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT: 866 force_hs_execp = true; 867 /* fallthrough */ 868 case RISCV_EXCP_INST_ADDR_MIS: 869 case RISCV_EXCP_INST_ACCESS_FAULT: 870 case RISCV_EXCP_LOAD_ADDR_MIS: 871 case RISCV_EXCP_STORE_AMO_ADDR_MIS: 872 case RISCV_EXCP_LOAD_ACCESS_FAULT: 873 case RISCV_EXCP_STORE_AMO_ACCESS_FAULT: 874 case RISCV_EXCP_INST_PAGE_FAULT: 875 case RISCV_EXCP_LOAD_PAGE_FAULT: 876 case RISCV_EXCP_STORE_PAGE_FAULT: 877 write_tval = true; 878 tval = env->badaddr; 879 break; 880 default: 881 break; 882 } 883 /* ecall is dispatched as one cause so translate based on mode */ 884 if (cause == RISCV_EXCP_U_ECALL) { 885 assert(env->priv <= 3); 886 887 if (env->priv == PRV_M) { 888 cause = RISCV_EXCP_M_ECALL; 889 } else if (env->priv == PRV_S && riscv_cpu_virt_enabled(env)) { 890 cause = RISCV_EXCP_VS_ECALL; 891 } else if (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) { 892 cause = RISCV_EXCP_S_ECALL; 893 } else if (env->priv == PRV_U) { 894 cause = RISCV_EXCP_U_ECALL; 895 } 896 } 897 } 898 899 trace_riscv_trap(env->mhartid, async, cause, env->pc, tval, 900 riscv_cpu_get_trap_name(cause, async)); 901 902 qemu_log_mask(CPU_LOG_INT, 903 "%s: hart:"TARGET_FMT_ld", async:%d, cause:"TARGET_FMT_lx", " 904 "epc:0x"TARGET_FMT_lx", tval:0x"TARGET_FMT_lx", desc=%s\n", 905 __func__, env->mhartid, async, cause, env->pc, tval, 906 riscv_cpu_get_trap_name(cause, async)); 907 908 if (env->priv <= PRV_S && 909 cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) { 910 /* handle the trap in S-mode */ 911 if (riscv_has_ext(env, RVH)) { 912 target_ulong hdeleg = async ? env->hideleg : env->hedeleg; 913 bool two_stage_lookup = false; 914 915 if (env->priv == PRV_M || 916 (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) || 917 (env->priv == PRV_U && !riscv_cpu_virt_enabled(env) && 918 get_field(env->hstatus, HSTATUS_HU))) { 919 two_stage_lookup = true; 920 } 921 922 if ((riscv_cpu_virt_enabled(env) || two_stage_lookup) && write_tval) { 923 /* 924 * If we are writing a guest virtual address to stval, set 925 * this to 1. If we are trapping to VS we will set this to 0 926 * later. 927 */ 928 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 1); 929 } else { 930 /* For other HS-mode traps, we set this to 0. */ 931 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0); 932 } 933 934 if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1) && 935 !force_hs_execp) { 936 /* Trap to VS mode */ 937 /* 938 * See if we need to adjust cause. Yes if its VS mode interrupt 939 * no if hypervisor has delegated one of hs mode's interrupt 940 */ 941 if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT || 942 cause == IRQ_VS_EXT) { 943 cause = cause - 1; 944 } 945 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0); 946 } else if (riscv_cpu_virt_enabled(env)) { 947 /* Trap into HS mode, from virt */ 948 riscv_cpu_swap_hypervisor_regs(env); 949 env->hstatus = set_field(env->hstatus, HSTATUS_SPVP, 950 env->priv); 951 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, 952 riscv_cpu_virt_enabled(env)); 953 954 htval = env->guest_phys_fault_addr; 955 956 riscv_cpu_set_virt_enabled(env, 0); 957 riscv_cpu_set_force_hs_excep(env, 0); 958 } else { 959 /* Trap into HS mode */ 960 if (!two_stage_lookup) { 961 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, 962 riscv_cpu_virt_enabled(env)); 963 } 964 htval = env->guest_phys_fault_addr; 965 } 966 } 967 968 s = env->mstatus; 969 s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE)); 970 s = set_field(s, MSTATUS_SPP, env->priv); 971 s = set_field(s, MSTATUS_SIE, 0); 972 env->mstatus = s; 973 env->scause = cause | ((target_ulong)async << (TARGET_LONG_BITS - 1)); 974 env->sepc = env->pc; 975 env->sbadaddr = tval; 976 env->htval = htval; 977 env->pc = (env->stvec >> 2 << 2) + 978 ((async && (env->stvec & 3) == 1) ? cause * 4 : 0); 979 riscv_cpu_set_mode(env, PRV_S); 980 } else { 981 /* handle the trap in M-mode */ 982 if (riscv_has_ext(env, RVH)) { 983 if (riscv_cpu_virt_enabled(env)) { 984 riscv_cpu_swap_hypervisor_regs(env); 985 } 986 env->mstatus = set_field(env->mstatus, MSTATUS_MPV, 987 riscv_cpu_virt_enabled(env)); 988 if (riscv_cpu_virt_enabled(env) && tval) { 989 env->mstatus = set_field(env->mstatus, MSTATUS_GVA, 1); 990 } 991 992 mtval2 = env->guest_phys_fault_addr; 993 994 /* Trapping to M mode, virt is disabled */ 995 riscv_cpu_set_virt_enabled(env, 0); 996 riscv_cpu_set_force_hs_excep(env, 0); 997 } 998 999 s = env->mstatus; 1000 s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE)); 1001 s = set_field(s, MSTATUS_MPP, env->priv); 1002 s = set_field(s, MSTATUS_MIE, 0); 1003 env->mstatus = s; 1004 env->mcause = cause | ~(((target_ulong)-1) >> async); 1005 env->mepc = env->pc; 1006 env->mbadaddr = tval; 1007 env->mtval2 = mtval2; 1008 env->pc = (env->mtvec >> 2 << 2) + 1009 ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0); 1010 riscv_cpu_set_mode(env, PRV_M); 1011 } 1012 1013 /* NOTE: it is not necessary to yield load reservations here. It is only 1014 * necessary for an SC from "another hart" to cause a load reservation 1015 * to be yielded. Refer to the memory consistency model section of the 1016 * RISC-V ISA Specification. 1017 */ 1018 1019 #endif 1020 cs->exception_index = EXCP_NONE; /* mark handled to qemu */ 1021 } 1022