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 "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 /* 284 * get_physical_address_pmp - check PMP permission for this physical address 285 * 286 * Match the PMP region and check permission for this physical address and it's 287 * TLB page. Returns 0 if the permission checking was successful 288 * 289 * @env: CPURISCVState 290 * @prot: The returned protection attributes 291 * @tlb_size: TLB page size containing addr. It could be modified after PMP 292 * permission checking. NULL if not set TLB page for addr. 293 * @addr: The physical address to be checked permission 294 * @access_type: The type of MMU access 295 * @mode: Indicates current privilege level. 296 */ 297 static int get_physical_address_pmp(CPURISCVState *env, int *prot, 298 target_ulong *tlb_size, hwaddr addr, 299 int size, MMUAccessType access_type, 300 int mode) 301 { 302 pmp_priv_t pmp_priv; 303 target_ulong tlb_size_pmp = 0; 304 305 if (!riscv_feature(env, RISCV_FEATURE_PMP)) { 306 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 307 return TRANSLATE_SUCCESS; 308 } 309 310 if (!pmp_hart_has_privs(env, addr, size, 1 << access_type, &pmp_priv, 311 mode)) { 312 *prot = 0; 313 return TRANSLATE_PMP_FAIL; 314 } 315 316 *prot = pmp_priv_to_page_prot(pmp_priv); 317 if (tlb_size != NULL) { 318 if (pmp_is_range_in_tlb(env, addr & ~(*tlb_size - 1), &tlb_size_pmp)) { 319 *tlb_size = tlb_size_pmp; 320 } 321 } 322 323 return TRANSLATE_SUCCESS; 324 } 325 326 /* get_physical_address - get the physical address for this virtual address 327 * 328 * Do a page table walk to obtain the physical address corresponding to a 329 * virtual address. Returns 0 if the translation was successful 330 * 331 * Adapted from Spike's mmu_t::translate and mmu_t::walk 332 * 333 * @env: CPURISCVState 334 * @physical: This will be set to the calculated physical address 335 * @prot: The returned protection attributes 336 * @addr: The virtual address to be translated 337 * @fault_pte_addr: If not NULL, this will be set to fault pte address 338 * when a error occurs on pte address translation. 339 * This will already be shifted to match htval. 340 * @access_type: The type of MMU access 341 * @mmu_idx: Indicates current privilege level 342 * @first_stage: Are we in first stage translation? 343 * Second stage is used for hypervisor guest translation 344 * @two_stage: Are we going to perform two stage translation 345 */ 346 static int get_physical_address(CPURISCVState *env, hwaddr *physical, 347 int *prot, target_ulong addr, 348 target_ulong *fault_pte_addr, 349 int access_type, int mmu_idx, 350 bool first_stage, bool two_stage) 351 { 352 /* NOTE: the env->pc value visible here will not be 353 * correct, but the value visible to the exception handler 354 * (riscv_cpu_do_interrupt) is correct */ 355 MemTxResult res; 356 MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; 357 int mode = mmu_idx & TB_FLAGS_PRIV_MMU_MASK; 358 bool use_background = false; 359 360 /* 361 * Check if we should use the background registers for the two 362 * stage translation. We don't need to check if we actually need 363 * two stage translation as that happened before this function 364 * was called. Background registers will be used if the guest has 365 * forced a two stage translation to be on (in HS or M mode). 366 */ 367 if (!riscv_cpu_virt_enabled(env) && riscv_cpu_two_stage_lookup(mmu_idx)) { 368 use_background = true; 369 } 370 371 if (mode == PRV_M && access_type != MMU_INST_FETCH) { 372 if (get_field(env->mstatus, MSTATUS_MPRV)) { 373 mode = get_field(env->mstatus, MSTATUS_MPP); 374 } 375 } 376 377 if (first_stage == false) { 378 /* We are in stage 2 translation, this is similar to stage 1. */ 379 /* Stage 2 is always taken as U-mode */ 380 mode = PRV_U; 381 } 382 383 if (mode == PRV_M || !riscv_feature(env, RISCV_FEATURE_MMU)) { 384 *physical = addr; 385 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 386 return TRANSLATE_SUCCESS; 387 } 388 389 *prot = 0; 390 391 hwaddr base; 392 int levels, ptidxbits, ptesize, vm, sum, mxr, widened; 393 394 if (first_stage == true) { 395 mxr = get_field(env->mstatus, MSTATUS_MXR); 396 } else { 397 mxr = get_field(env->vsstatus, MSTATUS_MXR); 398 } 399 400 if (first_stage == true) { 401 if (use_background) { 402 base = (hwaddr)get_field(env->vsatp, SATP_PPN) << PGSHIFT; 403 vm = get_field(env->vsatp, SATP_MODE); 404 } else { 405 base = (hwaddr)get_field(env->satp, SATP_PPN) << PGSHIFT; 406 vm = get_field(env->satp, SATP_MODE); 407 } 408 widened = 0; 409 } else { 410 base = (hwaddr)get_field(env->hgatp, HGATP_PPN) << PGSHIFT; 411 vm = get_field(env->hgatp, HGATP_MODE); 412 widened = 2; 413 } 414 /* status.SUM will be ignored if execute on background */ 415 sum = get_field(env->mstatus, MSTATUS_SUM) || use_background; 416 switch (vm) { 417 case VM_1_10_SV32: 418 levels = 2; ptidxbits = 10; ptesize = 4; break; 419 case VM_1_10_SV39: 420 levels = 3; ptidxbits = 9; ptesize = 8; break; 421 case VM_1_10_SV48: 422 levels = 4; ptidxbits = 9; ptesize = 8; break; 423 case VM_1_10_SV57: 424 levels = 5; ptidxbits = 9; ptesize = 8; break; 425 case VM_1_10_MBARE: 426 *physical = addr; 427 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 428 return TRANSLATE_SUCCESS; 429 default: 430 g_assert_not_reached(); 431 } 432 433 CPUState *cs = env_cpu(env); 434 int va_bits = PGSHIFT + levels * ptidxbits + widened; 435 target_ulong mask, masked_msbs; 436 437 if (TARGET_LONG_BITS > (va_bits - 1)) { 438 mask = (1L << (TARGET_LONG_BITS - (va_bits - 1))) - 1; 439 } else { 440 mask = 0; 441 } 442 masked_msbs = (addr >> (va_bits - 1)) & mask; 443 444 if (masked_msbs != 0 && masked_msbs != mask) { 445 return TRANSLATE_FAIL; 446 } 447 448 int ptshift = (levels - 1) * ptidxbits; 449 int i; 450 451 #if !TCG_OVERSIZED_GUEST 452 restart: 453 #endif 454 for (i = 0; i < levels; i++, ptshift -= ptidxbits) { 455 target_ulong idx; 456 if (i == 0) { 457 idx = (addr >> (PGSHIFT + ptshift)) & 458 ((1 << (ptidxbits + widened)) - 1); 459 } else { 460 idx = (addr >> (PGSHIFT + ptshift)) & 461 ((1 << ptidxbits) - 1); 462 } 463 464 /* check that physical address of PTE is legal */ 465 hwaddr pte_addr; 466 467 if (two_stage && first_stage) { 468 int vbase_prot; 469 hwaddr vbase; 470 471 /* Do the second stage translation on the base PTE address. */ 472 int vbase_ret = get_physical_address(env, &vbase, &vbase_prot, 473 base, NULL, MMU_DATA_LOAD, 474 mmu_idx, false, true); 475 476 if (vbase_ret != TRANSLATE_SUCCESS) { 477 if (fault_pte_addr) { 478 *fault_pte_addr = (base + idx * ptesize) >> 2; 479 } 480 return TRANSLATE_G_STAGE_FAIL; 481 } 482 483 pte_addr = vbase + idx * ptesize; 484 } else { 485 pte_addr = base + idx * ptesize; 486 } 487 488 int pmp_prot; 489 int pmp_ret = get_physical_address_pmp(env, &pmp_prot, NULL, pte_addr, 490 sizeof(target_ulong), 491 MMU_DATA_LOAD, PRV_S); 492 if (pmp_ret != TRANSLATE_SUCCESS) { 493 return TRANSLATE_PMP_FAIL; 494 } 495 496 target_ulong pte; 497 if (riscv_cpu_is_32bit(env)) { 498 pte = address_space_ldl(cs->as, pte_addr, attrs, &res); 499 } else { 500 pte = address_space_ldq(cs->as, pte_addr, attrs, &res); 501 } 502 503 if (res != MEMTX_OK) { 504 return TRANSLATE_FAIL; 505 } 506 507 hwaddr ppn = pte >> PTE_PPN_SHIFT; 508 509 if (!(pte & PTE_V)) { 510 /* Invalid PTE */ 511 return TRANSLATE_FAIL; 512 } else if (!(pte & (PTE_R | PTE_W | PTE_X))) { 513 /* Inner PTE, continue walking */ 514 base = ppn << PGSHIFT; 515 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) { 516 /* Reserved leaf PTE flags: PTE_W */ 517 return TRANSLATE_FAIL; 518 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == (PTE_W | PTE_X)) { 519 /* Reserved leaf PTE flags: PTE_W + PTE_X */ 520 return TRANSLATE_FAIL; 521 } else if ((pte & PTE_U) && ((mode != PRV_U) && 522 (!sum || access_type == MMU_INST_FETCH))) { 523 /* User PTE flags when not U mode and mstatus.SUM is not set, 524 or the access type is an instruction fetch */ 525 return TRANSLATE_FAIL; 526 } else if (!(pte & PTE_U) && (mode != PRV_S)) { 527 /* Supervisor PTE flags when not S mode */ 528 return TRANSLATE_FAIL; 529 } else if (ppn & ((1ULL << ptshift) - 1)) { 530 /* Misaligned PPN */ 531 return TRANSLATE_FAIL; 532 } else if (access_type == MMU_DATA_LOAD && !((pte & PTE_R) || 533 ((pte & PTE_X) && mxr))) { 534 /* Read access check failed */ 535 return TRANSLATE_FAIL; 536 } else if (access_type == MMU_DATA_STORE && !(pte & PTE_W)) { 537 /* Write access check failed */ 538 return TRANSLATE_FAIL; 539 } else if (access_type == MMU_INST_FETCH && !(pte & PTE_X)) { 540 /* Fetch access check failed */ 541 return TRANSLATE_FAIL; 542 } else { 543 /* if necessary, set accessed and dirty bits. */ 544 target_ulong updated_pte = pte | PTE_A | 545 (access_type == MMU_DATA_STORE ? PTE_D : 0); 546 547 /* Page table updates need to be atomic with MTTCG enabled */ 548 if (updated_pte != pte) { 549 /* 550 * - if accessed or dirty bits need updating, and the PTE is 551 * in RAM, then we do so atomically with a compare and swap. 552 * - if the PTE is in IO space or ROM, then it can't be updated 553 * and we return TRANSLATE_FAIL. 554 * - if the PTE changed by the time we went to update it, then 555 * it is no longer valid and we must re-walk the page table. 556 */ 557 MemoryRegion *mr; 558 hwaddr l = sizeof(target_ulong), addr1; 559 mr = address_space_translate(cs->as, pte_addr, 560 &addr1, &l, false, MEMTXATTRS_UNSPECIFIED); 561 if (memory_region_is_ram(mr)) { 562 target_ulong *pte_pa = 563 qemu_map_ram_ptr(mr->ram_block, addr1); 564 #if TCG_OVERSIZED_GUEST 565 /* MTTCG is not enabled on oversized TCG guests so 566 * page table updates do not need to be atomic */ 567 *pte_pa = pte = updated_pte; 568 #else 569 target_ulong old_pte = 570 qatomic_cmpxchg(pte_pa, pte, updated_pte); 571 if (old_pte != pte) { 572 goto restart; 573 } else { 574 pte = updated_pte; 575 } 576 #endif 577 } else { 578 /* misconfigured PTE in ROM (AD bits are not preset) or 579 * PTE is in IO space and can't be updated atomically */ 580 return TRANSLATE_FAIL; 581 } 582 } 583 584 /* for superpage mappings, make a fake leaf PTE for the TLB's 585 benefit. */ 586 target_ulong vpn = addr >> PGSHIFT; 587 *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) | 588 (addr & ~TARGET_PAGE_MASK); 589 590 /* set permissions on the TLB entry */ 591 if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) { 592 *prot |= PAGE_READ; 593 } 594 if ((pte & PTE_X)) { 595 *prot |= PAGE_EXEC; 596 } 597 /* add write permission on stores or if the page is already dirty, 598 so that we TLB miss on later writes to update the dirty bit */ 599 if ((pte & PTE_W) && 600 (access_type == MMU_DATA_STORE || (pte & PTE_D))) { 601 *prot |= PAGE_WRITE; 602 } 603 return TRANSLATE_SUCCESS; 604 } 605 } 606 return TRANSLATE_FAIL; 607 } 608 609 static void raise_mmu_exception(CPURISCVState *env, target_ulong address, 610 MMUAccessType access_type, bool pmp_violation, 611 bool first_stage, bool two_stage) 612 { 613 CPUState *cs = env_cpu(env); 614 int page_fault_exceptions; 615 if (first_stage) { 616 page_fault_exceptions = 617 get_field(env->satp, SATP_MODE) != VM_1_10_MBARE && 618 !pmp_violation; 619 } else { 620 page_fault_exceptions = 621 get_field(env->hgatp, HGATP_MODE) != VM_1_10_MBARE && 622 !pmp_violation; 623 } 624 switch (access_type) { 625 case MMU_INST_FETCH: 626 if (riscv_cpu_virt_enabled(env) && !first_stage) { 627 cs->exception_index = RISCV_EXCP_INST_GUEST_PAGE_FAULT; 628 } else { 629 cs->exception_index = page_fault_exceptions ? 630 RISCV_EXCP_INST_PAGE_FAULT : RISCV_EXCP_INST_ACCESS_FAULT; 631 } 632 break; 633 case MMU_DATA_LOAD: 634 if (two_stage && !first_stage) { 635 cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT; 636 } else { 637 cs->exception_index = page_fault_exceptions ? 638 RISCV_EXCP_LOAD_PAGE_FAULT : RISCV_EXCP_LOAD_ACCESS_FAULT; 639 } 640 break; 641 case MMU_DATA_STORE: 642 if (two_stage && !first_stage) { 643 cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT; 644 } else { 645 cs->exception_index = page_fault_exceptions ? 646 RISCV_EXCP_STORE_PAGE_FAULT : RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 647 } 648 break; 649 default: 650 g_assert_not_reached(); 651 } 652 env->badaddr = address; 653 } 654 655 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) 656 { 657 RISCVCPU *cpu = RISCV_CPU(cs); 658 CPURISCVState *env = &cpu->env; 659 hwaddr phys_addr; 660 int prot; 661 int mmu_idx = cpu_mmu_index(&cpu->env, false); 662 663 if (get_physical_address(env, &phys_addr, &prot, addr, NULL, 0, mmu_idx, 664 true, riscv_cpu_virt_enabled(env))) { 665 return -1; 666 } 667 668 if (riscv_cpu_virt_enabled(env)) { 669 if (get_physical_address(env, &phys_addr, &prot, phys_addr, NULL, 670 0, mmu_idx, false, true)) { 671 return -1; 672 } 673 } 674 675 return phys_addr & TARGET_PAGE_MASK; 676 } 677 678 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, 679 vaddr addr, unsigned size, 680 MMUAccessType access_type, 681 int mmu_idx, MemTxAttrs attrs, 682 MemTxResult response, uintptr_t retaddr) 683 { 684 RISCVCPU *cpu = RISCV_CPU(cs); 685 CPURISCVState *env = &cpu->env; 686 687 if (access_type == MMU_DATA_STORE) { 688 cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 689 } else { 690 cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; 691 } 692 693 env->badaddr = addr; 694 riscv_raise_exception(&cpu->env, cs->exception_index, retaddr); 695 } 696 697 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 698 MMUAccessType access_type, int mmu_idx, 699 uintptr_t retaddr) 700 { 701 RISCVCPU *cpu = RISCV_CPU(cs); 702 CPURISCVState *env = &cpu->env; 703 switch (access_type) { 704 case MMU_INST_FETCH: 705 cs->exception_index = RISCV_EXCP_INST_ADDR_MIS; 706 break; 707 case MMU_DATA_LOAD: 708 cs->exception_index = RISCV_EXCP_LOAD_ADDR_MIS; 709 break; 710 case MMU_DATA_STORE: 711 cs->exception_index = RISCV_EXCP_STORE_AMO_ADDR_MIS; 712 break; 713 default: 714 g_assert_not_reached(); 715 } 716 env->badaddr = addr; 717 riscv_raise_exception(env, cs->exception_index, retaddr); 718 } 719 #endif /* !CONFIG_USER_ONLY */ 720 721 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 722 MMUAccessType access_type, int mmu_idx, 723 bool probe, uintptr_t retaddr) 724 { 725 RISCVCPU *cpu = RISCV_CPU(cs); 726 CPURISCVState *env = &cpu->env; 727 #ifndef CONFIG_USER_ONLY 728 vaddr im_address; 729 hwaddr pa = 0; 730 int prot, prot2, prot_pmp; 731 bool pmp_violation = false; 732 bool first_stage_error = true; 733 bool two_stage_lookup = false; 734 int ret = TRANSLATE_FAIL; 735 int mode = mmu_idx; 736 /* default TLB page size */ 737 target_ulong tlb_size = TARGET_PAGE_SIZE; 738 739 env->guest_phys_fault_addr = 0; 740 741 qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n", 742 __func__, address, access_type, mmu_idx); 743 744 if (mode == PRV_M && access_type != MMU_INST_FETCH) { 745 if (get_field(env->mstatus, MSTATUS_MPRV)) { 746 mode = get_field(env->mstatus, MSTATUS_MPP); 747 } 748 } 749 750 if (riscv_has_ext(env, RVH) && env->priv == PRV_M && 751 access_type != MMU_INST_FETCH && 752 get_field(env->mstatus, MSTATUS_MPRV) && 753 get_field(env->mstatus, MSTATUS_MPV)) { 754 two_stage_lookup = true; 755 } 756 757 if (riscv_cpu_virt_enabled(env) || 758 ((riscv_cpu_two_stage_lookup(mmu_idx) || two_stage_lookup) && 759 access_type != MMU_INST_FETCH)) { 760 /* Two stage lookup */ 761 ret = get_physical_address(env, &pa, &prot, address, 762 &env->guest_phys_fault_addr, access_type, 763 mmu_idx, true, true); 764 765 /* 766 * A G-stage exception may be triggered during two state lookup. 767 * And the env->guest_phys_fault_addr has already been set in 768 * get_physical_address(). 769 */ 770 if (ret == TRANSLATE_G_STAGE_FAIL) { 771 first_stage_error = false; 772 access_type = MMU_DATA_LOAD; 773 } 774 775 qemu_log_mask(CPU_LOG_MMU, 776 "%s 1st-stage address=%" VADDR_PRIx " ret %d physical " 777 TARGET_FMT_plx " prot %d\n", 778 __func__, address, ret, pa, prot); 779 780 if (ret == TRANSLATE_SUCCESS) { 781 /* Second stage lookup */ 782 im_address = pa; 783 784 ret = get_physical_address(env, &pa, &prot2, im_address, NULL, 785 access_type, mmu_idx, false, true); 786 787 qemu_log_mask(CPU_LOG_MMU, 788 "%s 2nd-stage address=%" VADDR_PRIx " ret %d physical " 789 TARGET_FMT_plx " prot %d\n", 790 __func__, im_address, ret, pa, prot2); 791 792 prot &= prot2; 793 794 if (ret == TRANSLATE_SUCCESS) { 795 ret = get_physical_address_pmp(env, &prot_pmp, &tlb_size, pa, 796 size, access_type, mode); 797 798 qemu_log_mask(CPU_LOG_MMU, 799 "%s PMP address=" TARGET_FMT_plx " ret %d prot" 800 " %d tlb_size " TARGET_FMT_lu "\n", 801 __func__, pa, ret, prot_pmp, tlb_size); 802 803 prot &= prot_pmp; 804 } 805 806 if (ret != TRANSLATE_SUCCESS) { 807 /* 808 * Guest physical address translation failed, this is a HS 809 * level exception 810 */ 811 first_stage_error = false; 812 env->guest_phys_fault_addr = (im_address | 813 (address & 814 (TARGET_PAGE_SIZE - 1))) >> 2; 815 } 816 } 817 } else { 818 /* Single stage lookup */ 819 ret = get_physical_address(env, &pa, &prot, address, NULL, 820 access_type, mmu_idx, true, false); 821 822 qemu_log_mask(CPU_LOG_MMU, 823 "%s address=%" VADDR_PRIx " ret %d physical " 824 TARGET_FMT_plx " prot %d\n", 825 __func__, address, ret, pa, prot); 826 827 if (ret == TRANSLATE_SUCCESS) { 828 ret = get_physical_address_pmp(env, &prot_pmp, &tlb_size, pa, 829 size, access_type, mode); 830 831 qemu_log_mask(CPU_LOG_MMU, 832 "%s PMP address=" TARGET_FMT_plx " ret %d prot" 833 " %d tlb_size " TARGET_FMT_lu "\n", 834 __func__, pa, ret, prot_pmp, tlb_size); 835 836 prot &= prot_pmp; 837 } 838 } 839 840 if (ret == TRANSLATE_PMP_FAIL) { 841 pmp_violation = true; 842 } 843 844 if (ret == TRANSLATE_SUCCESS) { 845 tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1), 846 prot, mmu_idx, tlb_size); 847 return true; 848 } else if (probe) { 849 return false; 850 } else { 851 raise_mmu_exception(env, address, access_type, pmp_violation, 852 first_stage_error, 853 riscv_cpu_virt_enabled(env) || 854 riscv_cpu_two_stage_lookup(mmu_idx)); 855 riscv_raise_exception(env, cs->exception_index, retaddr); 856 } 857 858 return true; 859 860 #else 861 switch (access_type) { 862 case MMU_INST_FETCH: 863 cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT; 864 break; 865 case MMU_DATA_LOAD: 866 cs->exception_index = RISCV_EXCP_LOAD_PAGE_FAULT; 867 break; 868 case MMU_DATA_STORE: 869 cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT; 870 break; 871 default: 872 g_assert_not_reached(); 873 } 874 env->badaddr = address; 875 cpu_loop_exit_restore(cs, retaddr); 876 #endif 877 } 878 879 /* 880 * Handle Traps 881 * 882 * Adapted from Spike's processor_t::take_trap. 883 * 884 */ 885 void riscv_cpu_do_interrupt(CPUState *cs) 886 { 887 #if !defined(CONFIG_USER_ONLY) 888 889 RISCVCPU *cpu = RISCV_CPU(cs); 890 CPURISCVState *env = &cpu->env; 891 bool force_hs_execp = riscv_cpu_force_hs_excep_enabled(env); 892 uint64_t s; 893 894 /* cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide 895 * so we mask off the MSB and separate into trap type and cause. 896 */ 897 bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG); 898 target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK; 899 target_ulong deleg = async ? env->mideleg : env->medeleg; 900 bool write_tval = false; 901 target_ulong tval = 0; 902 target_ulong htval = 0; 903 target_ulong mtval2 = 0; 904 905 if (cause == RISCV_EXCP_SEMIHOST) { 906 if (env->priv >= PRV_S) { 907 env->gpr[xA0] = do_common_semihosting(cs); 908 env->pc += 4; 909 return; 910 } 911 cause = RISCV_EXCP_BREAKPOINT; 912 } 913 914 if (!async) { 915 /* set tval to badaddr for traps with address information */ 916 switch (cause) { 917 case RISCV_EXCP_INST_GUEST_PAGE_FAULT: 918 case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: 919 case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT: 920 force_hs_execp = true; 921 /* fallthrough */ 922 case RISCV_EXCP_INST_ADDR_MIS: 923 case RISCV_EXCP_INST_ACCESS_FAULT: 924 case RISCV_EXCP_LOAD_ADDR_MIS: 925 case RISCV_EXCP_STORE_AMO_ADDR_MIS: 926 case RISCV_EXCP_LOAD_ACCESS_FAULT: 927 case RISCV_EXCP_STORE_AMO_ACCESS_FAULT: 928 case RISCV_EXCP_INST_PAGE_FAULT: 929 case RISCV_EXCP_LOAD_PAGE_FAULT: 930 case RISCV_EXCP_STORE_PAGE_FAULT: 931 write_tval = true; 932 tval = env->badaddr; 933 break; 934 default: 935 break; 936 } 937 /* ecall is dispatched as one cause so translate based on mode */ 938 if (cause == RISCV_EXCP_U_ECALL) { 939 assert(env->priv <= 3); 940 941 if (env->priv == PRV_M) { 942 cause = RISCV_EXCP_M_ECALL; 943 } else if (env->priv == PRV_S && riscv_cpu_virt_enabled(env)) { 944 cause = RISCV_EXCP_VS_ECALL; 945 } else if (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) { 946 cause = RISCV_EXCP_S_ECALL; 947 } else if (env->priv == PRV_U) { 948 cause = RISCV_EXCP_U_ECALL; 949 } 950 } 951 } 952 953 trace_riscv_trap(env->mhartid, async, cause, env->pc, tval, 954 riscv_cpu_get_trap_name(cause, async)); 955 956 qemu_log_mask(CPU_LOG_INT, 957 "%s: hart:"TARGET_FMT_ld", async:%d, cause:"TARGET_FMT_lx", " 958 "epc:0x"TARGET_FMT_lx", tval:0x"TARGET_FMT_lx", desc=%s\n", 959 __func__, env->mhartid, async, cause, env->pc, tval, 960 riscv_cpu_get_trap_name(cause, async)); 961 962 if (env->priv <= PRV_S && 963 cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) { 964 /* handle the trap in S-mode */ 965 if (riscv_has_ext(env, RVH)) { 966 target_ulong hdeleg = async ? env->hideleg : env->hedeleg; 967 bool two_stage_lookup = false; 968 969 if (env->priv == PRV_M || 970 (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) || 971 (env->priv == PRV_U && !riscv_cpu_virt_enabled(env) && 972 get_field(env->hstatus, HSTATUS_HU))) { 973 two_stage_lookup = true; 974 } 975 976 if ((riscv_cpu_virt_enabled(env) || two_stage_lookup) && write_tval) { 977 /* 978 * If we are writing a guest virtual address to stval, set 979 * this to 1. If we are trapping to VS we will set this to 0 980 * later. 981 */ 982 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 1); 983 } else { 984 /* For other HS-mode traps, we set this to 0. */ 985 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0); 986 } 987 988 if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1) && 989 !force_hs_execp) { 990 /* Trap to VS mode */ 991 /* 992 * See if we need to adjust cause. Yes if its VS mode interrupt 993 * no if hypervisor has delegated one of hs mode's interrupt 994 */ 995 if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT || 996 cause == IRQ_VS_EXT) { 997 cause = cause - 1; 998 } 999 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0); 1000 } else if (riscv_cpu_virt_enabled(env)) { 1001 /* Trap into HS mode, from virt */ 1002 riscv_cpu_swap_hypervisor_regs(env); 1003 env->hstatus = set_field(env->hstatus, HSTATUS_SPVP, 1004 env->priv); 1005 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, 1006 riscv_cpu_virt_enabled(env)); 1007 1008 htval = env->guest_phys_fault_addr; 1009 1010 riscv_cpu_set_virt_enabled(env, 0); 1011 riscv_cpu_set_force_hs_excep(env, 0); 1012 } else { 1013 /* Trap into HS mode */ 1014 if (!two_stage_lookup) { 1015 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, 1016 riscv_cpu_virt_enabled(env)); 1017 } 1018 htval = env->guest_phys_fault_addr; 1019 } 1020 } 1021 1022 s = env->mstatus; 1023 s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE)); 1024 s = set_field(s, MSTATUS_SPP, env->priv); 1025 s = set_field(s, MSTATUS_SIE, 0); 1026 env->mstatus = s; 1027 env->scause = cause | ((target_ulong)async << (TARGET_LONG_BITS - 1)); 1028 env->sepc = env->pc; 1029 env->sbadaddr = tval; 1030 env->htval = htval; 1031 env->pc = (env->stvec >> 2 << 2) + 1032 ((async && (env->stvec & 3) == 1) ? cause * 4 : 0); 1033 riscv_cpu_set_mode(env, PRV_S); 1034 } else { 1035 /* handle the trap in M-mode */ 1036 if (riscv_has_ext(env, RVH)) { 1037 if (riscv_cpu_virt_enabled(env)) { 1038 riscv_cpu_swap_hypervisor_regs(env); 1039 } 1040 env->mstatus = set_field(env->mstatus, MSTATUS_MPV, 1041 riscv_cpu_virt_enabled(env)); 1042 if (riscv_cpu_virt_enabled(env) && tval) { 1043 env->mstatus = set_field(env->mstatus, MSTATUS_GVA, 1); 1044 } 1045 1046 mtval2 = env->guest_phys_fault_addr; 1047 1048 /* Trapping to M mode, virt is disabled */ 1049 riscv_cpu_set_virt_enabled(env, 0); 1050 riscv_cpu_set_force_hs_excep(env, 0); 1051 } 1052 1053 s = env->mstatus; 1054 s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE)); 1055 s = set_field(s, MSTATUS_MPP, env->priv); 1056 s = set_field(s, MSTATUS_MIE, 0); 1057 env->mstatus = s; 1058 env->mcause = cause | ~(((target_ulong)-1) >> async); 1059 env->mepc = env->pc; 1060 env->mbadaddr = tval; 1061 env->mtval2 = mtval2; 1062 env->pc = (env->mtvec >> 2 << 2) + 1063 ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0); 1064 riscv_cpu_set_mode(env, PRV_M); 1065 } 1066 1067 /* NOTE: it is not necessary to yield load reservations here. It is only 1068 * necessary for an SC from "another hart" to cause a load reservation 1069 * to be yielded. Refer to the memory consistency model section of the 1070 * RISC-V ISA Specification. 1071 */ 1072 1073 #endif 1074 cs->exception_index = EXCP_NONE; /* mark handled to qemu */ 1075 } 1076