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 RISCV_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->stval; 140 env->stval = 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->stval; 163 env->stval = 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 * @is_debug: Is this access from a debugger or the monitor? 346 */ 347 static int get_physical_address(CPURISCVState *env, hwaddr *physical, 348 int *prot, target_ulong addr, 349 target_ulong *fault_pte_addr, 350 int access_type, int mmu_idx, 351 bool first_stage, bool two_stage, 352 bool is_debug) 353 { 354 /* NOTE: the env->pc value visible here will not be 355 * correct, but the value visible to the exception handler 356 * (riscv_cpu_do_interrupt) is correct */ 357 MemTxResult res; 358 MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED; 359 int mode = mmu_idx & TB_FLAGS_PRIV_MMU_MASK; 360 bool use_background = false; 361 362 /* 363 * Check if we should use the background registers for the two 364 * stage translation. We don't need to check if we actually need 365 * two stage translation as that happened before this function 366 * was called. Background registers will be used if the guest has 367 * forced a two stage translation to be on (in HS or M mode). 368 */ 369 if (!riscv_cpu_virt_enabled(env) && two_stage) { 370 use_background = true; 371 } 372 373 /* MPRV does not affect the virtual-machine load/store 374 instructions, HLV, HLVX, and HSV. */ 375 if (riscv_cpu_two_stage_lookup(mmu_idx)) { 376 mode = get_field(env->hstatus, HSTATUS_SPVP); 377 } else if (mode == PRV_M && access_type != MMU_INST_FETCH) { 378 if (get_field(env->mstatus, MSTATUS_MPRV)) { 379 mode = get_field(env->mstatus, MSTATUS_MPP); 380 } 381 } 382 383 if (first_stage == false) { 384 /* We are in stage 2 translation, this is similar to stage 1. */ 385 /* Stage 2 is always taken as U-mode */ 386 mode = PRV_U; 387 } 388 389 if (mode == PRV_M || !riscv_feature(env, RISCV_FEATURE_MMU)) { 390 *physical = addr; 391 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 392 return TRANSLATE_SUCCESS; 393 } 394 395 *prot = 0; 396 397 hwaddr base; 398 int levels, ptidxbits, ptesize, vm, sum, mxr, widened; 399 400 if (first_stage == true) { 401 mxr = get_field(env->mstatus, MSTATUS_MXR); 402 } else { 403 mxr = get_field(env->vsstatus, MSTATUS_MXR); 404 } 405 406 if (first_stage == true) { 407 if (use_background) { 408 base = (hwaddr)get_field(env->vsatp, SATP_PPN) << PGSHIFT; 409 vm = get_field(env->vsatp, SATP_MODE); 410 } else { 411 base = (hwaddr)get_field(env->satp, SATP_PPN) << PGSHIFT; 412 vm = get_field(env->satp, SATP_MODE); 413 } 414 widened = 0; 415 } else { 416 base = (hwaddr)get_field(env->hgatp, HGATP_PPN) << PGSHIFT; 417 vm = get_field(env->hgatp, HGATP_MODE); 418 widened = 2; 419 } 420 /* status.SUM will be ignored if execute on background */ 421 sum = get_field(env->mstatus, MSTATUS_SUM) || use_background || is_debug; 422 switch (vm) { 423 case VM_1_10_SV32: 424 levels = 2; ptidxbits = 10; ptesize = 4; break; 425 case VM_1_10_SV39: 426 levels = 3; ptidxbits = 9; ptesize = 8; break; 427 case VM_1_10_SV48: 428 levels = 4; ptidxbits = 9; ptesize = 8; break; 429 case VM_1_10_SV57: 430 levels = 5; ptidxbits = 9; ptesize = 8; break; 431 case VM_1_10_MBARE: 432 *physical = addr; 433 *prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC; 434 return TRANSLATE_SUCCESS; 435 default: 436 g_assert_not_reached(); 437 } 438 439 CPUState *cs = env_cpu(env); 440 int va_bits = PGSHIFT + levels * ptidxbits + widened; 441 target_ulong mask, masked_msbs; 442 443 if (TARGET_LONG_BITS > (va_bits - 1)) { 444 mask = (1L << (TARGET_LONG_BITS - (va_bits - 1))) - 1; 445 } else { 446 mask = 0; 447 } 448 masked_msbs = (addr >> (va_bits - 1)) & mask; 449 450 if (masked_msbs != 0 && masked_msbs != mask) { 451 return TRANSLATE_FAIL; 452 } 453 454 int ptshift = (levels - 1) * ptidxbits; 455 int i; 456 457 #if !TCG_OVERSIZED_GUEST 458 restart: 459 #endif 460 for (i = 0; i < levels; i++, ptshift -= ptidxbits) { 461 target_ulong idx; 462 if (i == 0) { 463 idx = (addr >> (PGSHIFT + ptshift)) & 464 ((1 << (ptidxbits + widened)) - 1); 465 } else { 466 idx = (addr >> (PGSHIFT + ptshift)) & 467 ((1 << ptidxbits) - 1); 468 } 469 470 /* check that physical address of PTE is legal */ 471 hwaddr pte_addr; 472 473 if (two_stage && first_stage) { 474 int vbase_prot; 475 hwaddr vbase; 476 477 /* Do the second stage translation on the base PTE address. */ 478 int vbase_ret = get_physical_address(env, &vbase, &vbase_prot, 479 base, NULL, MMU_DATA_LOAD, 480 mmu_idx, false, true, 481 is_debug); 482 483 if (vbase_ret != TRANSLATE_SUCCESS) { 484 if (fault_pte_addr) { 485 *fault_pte_addr = (base + idx * ptesize) >> 2; 486 } 487 return TRANSLATE_G_STAGE_FAIL; 488 } 489 490 pte_addr = vbase + idx * ptesize; 491 } else { 492 pte_addr = base + idx * ptesize; 493 } 494 495 int pmp_prot; 496 int pmp_ret = get_physical_address_pmp(env, &pmp_prot, NULL, pte_addr, 497 sizeof(target_ulong), 498 MMU_DATA_LOAD, PRV_S); 499 if (pmp_ret != TRANSLATE_SUCCESS) { 500 return TRANSLATE_PMP_FAIL; 501 } 502 503 target_ulong pte; 504 if (riscv_cpu_is_32bit(env)) { 505 pte = address_space_ldl(cs->as, pte_addr, attrs, &res); 506 } else { 507 pte = address_space_ldq(cs->as, pte_addr, attrs, &res); 508 } 509 510 if (res != MEMTX_OK) { 511 return TRANSLATE_FAIL; 512 } 513 514 hwaddr ppn = pte >> PTE_PPN_SHIFT; 515 516 if (!(pte & PTE_V)) { 517 /* Invalid PTE */ 518 return TRANSLATE_FAIL; 519 } else if (!(pte & (PTE_R | PTE_W | PTE_X))) { 520 /* Inner PTE, continue walking */ 521 base = ppn << PGSHIFT; 522 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == PTE_W) { 523 /* Reserved leaf PTE flags: PTE_W */ 524 return TRANSLATE_FAIL; 525 } else if ((pte & (PTE_R | PTE_W | PTE_X)) == (PTE_W | PTE_X)) { 526 /* Reserved leaf PTE flags: PTE_W + PTE_X */ 527 return TRANSLATE_FAIL; 528 } else if ((pte & PTE_U) && ((mode != PRV_U) && 529 (!sum || access_type == MMU_INST_FETCH))) { 530 /* User PTE flags when not U mode and mstatus.SUM is not set, 531 or the access type is an instruction fetch */ 532 return TRANSLATE_FAIL; 533 } else if (!(pte & PTE_U) && (mode != PRV_S)) { 534 /* Supervisor PTE flags when not S mode */ 535 return TRANSLATE_FAIL; 536 } else if (ppn & ((1ULL << ptshift) - 1)) { 537 /* Misaligned PPN */ 538 return TRANSLATE_FAIL; 539 } else if (access_type == MMU_DATA_LOAD && !((pte & PTE_R) || 540 ((pte & PTE_X) && mxr))) { 541 /* Read access check failed */ 542 return TRANSLATE_FAIL; 543 } else if (access_type == MMU_DATA_STORE && !(pte & PTE_W)) { 544 /* Write access check failed */ 545 return TRANSLATE_FAIL; 546 } else if (access_type == MMU_INST_FETCH && !(pte & PTE_X)) { 547 /* Fetch access check failed */ 548 return TRANSLATE_FAIL; 549 } else { 550 /* if necessary, set accessed and dirty bits. */ 551 target_ulong updated_pte = pte | PTE_A | 552 (access_type == MMU_DATA_STORE ? PTE_D : 0); 553 554 /* Page table updates need to be atomic with MTTCG enabled */ 555 if (updated_pte != pte) { 556 /* 557 * - if accessed or dirty bits need updating, and the PTE is 558 * in RAM, then we do so atomically with a compare and swap. 559 * - if the PTE is in IO space or ROM, then it can't be updated 560 * and we return TRANSLATE_FAIL. 561 * - if the PTE changed by the time we went to update it, then 562 * it is no longer valid and we must re-walk the page table. 563 */ 564 MemoryRegion *mr; 565 hwaddr l = sizeof(target_ulong), addr1; 566 mr = address_space_translate(cs->as, pte_addr, 567 &addr1, &l, false, MEMTXATTRS_UNSPECIFIED); 568 if (memory_region_is_ram(mr)) { 569 target_ulong *pte_pa = 570 qemu_map_ram_ptr(mr->ram_block, addr1); 571 #if TCG_OVERSIZED_GUEST 572 /* MTTCG is not enabled on oversized TCG guests so 573 * page table updates do not need to be atomic */ 574 *pte_pa = pte = updated_pte; 575 #else 576 target_ulong old_pte = 577 qatomic_cmpxchg(pte_pa, pte, updated_pte); 578 if (old_pte != pte) { 579 goto restart; 580 } else { 581 pte = updated_pte; 582 } 583 #endif 584 } else { 585 /* misconfigured PTE in ROM (AD bits are not preset) or 586 * PTE is in IO space and can't be updated atomically */ 587 return TRANSLATE_FAIL; 588 } 589 } 590 591 /* for superpage mappings, make a fake leaf PTE for the TLB's 592 benefit. */ 593 target_ulong vpn = addr >> PGSHIFT; 594 *physical = ((ppn | (vpn & ((1L << ptshift) - 1))) << PGSHIFT) | 595 (addr & ~TARGET_PAGE_MASK); 596 597 /* set permissions on the TLB entry */ 598 if ((pte & PTE_R) || ((pte & PTE_X) && mxr)) { 599 *prot |= PAGE_READ; 600 } 601 if ((pte & PTE_X)) { 602 *prot |= PAGE_EXEC; 603 } 604 /* add write permission on stores or if the page is already dirty, 605 so that we TLB miss on later writes to update the dirty bit */ 606 if ((pte & PTE_W) && 607 (access_type == MMU_DATA_STORE || (pte & PTE_D))) { 608 *prot |= PAGE_WRITE; 609 } 610 return TRANSLATE_SUCCESS; 611 } 612 } 613 return TRANSLATE_FAIL; 614 } 615 616 static void raise_mmu_exception(CPURISCVState *env, target_ulong address, 617 MMUAccessType access_type, bool pmp_violation, 618 bool first_stage, bool two_stage) 619 { 620 CPUState *cs = env_cpu(env); 621 int page_fault_exceptions; 622 if (first_stage) { 623 page_fault_exceptions = 624 get_field(env->satp, SATP_MODE) != VM_1_10_MBARE && 625 !pmp_violation; 626 } else { 627 page_fault_exceptions = 628 get_field(env->hgatp, HGATP_MODE) != VM_1_10_MBARE && 629 !pmp_violation; 630 } 631 switch (access_type) { 632 case MMU_INST_FETCH: 633 if (riscv_cpu_virt_enabled(env) && !first_stage) { 634 cs->exception_index = RISCV_EXCP_INST_GUEST_PAGE_FAULT; 635 } else { 636 cs->exception_index = page_fault_exceptions ? 637 RISCV_EXCP_INST_PAGE_FAULT : RISCV_EXCP_INST_ACCESS_FAULT; 638 } 639 break; 640 case MMU_DATA_LOAD: 641 if (two_stage && !first_stage) { 642 cs->exception_index = RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT; 643 } else { 644 cs->exception_index = page_fault_exceptions ? 645 RISCV_EXCP_LOAD_PAGE_FAULT : RISCV_EXCP_LOAD_ACCESS_FAULT; 646 } 647 break; 648 case MMU_DATA_STORE: 649 if (two_stage && !first_stage) { 650 cs->exception_index = RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT; 651 } else { 652 cs->exception_index = page_fault_exceptions ? 653 RISCV_EXCP_STORE_PAGE_FAULT : RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 654 } 655 break; 656 default: 657 g_assert_not_reached(); 658 } 659 env->badaddr = address; 660 env->two_stage_lookup = two_stage; 661 } 662 663 hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr) 664 { 665 RISCVCPU *cpu = RISCV_CPU(cs); 666 CPURISCVState *env = &cpu->env; 667 hwaddr phys_addr; 668 int prot; 669 int mmu_idx = cpu_mmu_index(&cpu->env, false); 670 671 if (get_physical_address(env, &phys_addr, &prot, addr, NULL, 0, mmu_idx, 672 true, riscv_cpu_virt_enabled(env), true)) { 673 return -1; 674 } 675 676 if (riscv_cpu_virt_enabled(env)) { 677 if (get_physical_address(env, &phys_addr, &prot, phys_addr, NULL, 678 0, mmu_idx, false, true, true)) { 679 return -1; 680 } 681 } 682 683 return phys_addr & TARGET_PAGE_MASK; 684 } 685 686 void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr physaddr, 687 vaddr addr, unsigned size, 688 MMUAccessType access_type, 689 int mmu_idx, MemTxAttrs attrs, 690 MemTxResult response, uintptr_t retaddr) 691 { 692 RISCVCPU *cpu = RISCV_CPU(cs); 693 CPURISCVState *env = &cpu->env; 694 695 if (access_type == MMU_DATA_STORE) { 696 cs->exception_index = RISCV_EXCP_STORE_AMO_ACCESS_FAULT; 697 } else { 698 cs->exception_index = RISCV_EXCP_LOAD_ACCESS_FAULT; 699 } 700 701 env->badaddr = addr; 702 env->two_stage_lookup = riscv_cpu_virt_enabled(env) || 703 riscv_cpu_two_stage_lookup(mmu_idx); 704 riscv_raise_exception(&cpu->env, cs->exception_index, retaddr); 705 } 706 707 void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr addr, 708 MMUAccessType access_type, int mmu_idx, 709 uintptr_t retaddr) 710 { 711 RISCVCPU *cpu = RISCV_CPU(cs); 712 CPURISCVState *env = &cpu->env; 713 switch (access_type) { 714 case MMU_INST_FETCH: 715 cs->exception_index = RISCV_EXCP_INST_ADDR_MIS; 716 break; 717 case MMU_DATA_LOAD: 718 cs->exception_index = RISCV_EXCP_LOAD_ADDR_MIS; 719 break; 720 case MMU_DATA_STORE: 721 cs->exception_index = RISCV_EXCP_STORE_AMO_ADDR_MIS; 722 break; 723 default: 724 g_assert_not_reached(); 725 } 726 env->badaddr = addr; 727 env->two_stage_lookup = riscv_cpu_virt_enabled(env) || 728 riscv_cpu_two_stage_lookup(mmu_idx); 729 riscv_raise_exception(env, cs->exception_index, retaddr); 730 } 731 #endif /* !CONFIG_USER_ONLY */ 732 733 bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int size, 734 MMUAccessType access_type, int mmu_idx, 735 bool probe, uintptr_t retaddr) 736 { 737 RISCVCPU *cpu = RISCV_CPU(cs); 738 CPURISCVState *env = &cpu->env; 739 #ifndef CONFIG_USER_ONLY 740 vaddr im_address; 741 hwaddr pa = 0; 742 int prot, prot2, prot_pmp; 743 bool pmp_violation = false; 744 bool first_stage_error = true; 745 bool two_stage_lookup = false; 746 int ret = TRANSLATE_FAIL; 747 int mode = mmu_idx; 748 /* default TLB page size */ 749 target_ulong tlb_size = TARGET_PAGE_SIZE; 750 751 env->guest_phys_fault_addr = 0; 752 753 qemu_log_mask(CPU_LOG_MMU, "%s ad %" VADDR_PRIx " rw %d mmu_idx %d\n", 754 __func__, address, access_type, mmu_idx); 755 756 /* MPRV does not affect the virtual-machine load/store 757 instructions, HLV, HLVX, and HSV. */ 758 if (riscv_cpu_two_stage_lookup(mmu_idx)) { 759 mode = get_field(env->hstatus, HSTATUS_SPVP); 760 } else if (mode == PRV_M && access_type != MMU_INST_FETCH && 761 get_field(env->mstatus, MSTATUS_MPRV)) { 762 mode = get_field(env->mstatus, MSTATUS_MPP); 763 if (riscv_has_ext(env, RVH) && get_field(env->mstatus, MSTATUS_MPV)) { 764 two_stage_lookup = true; 765 } 766 } 767 768 if (riscv_cpu_virt_enabled(env) || 769 ((riscv_cpu_two_stage_lookup(mmu_idx) || two_stage_lookup) && 770 access_type != MMU_INST_FETCH)) { 771 /* Two stage lookup */ 772 ret = get_physical_address(env, &pa, &prot, address, 773 &env->guest_phys_fault_addr, access_type, 774 mmu_idx, true, true, false); 775 776 /* 777 * A G-stage exception may be triggered during two state lookup. 778 * And the env->guest_phys_fault_addr has already been set in 779 * get_physical_address(). 780 */ 781 if (ret == TRANSLATE_G_STAGE_FAIL) { 782 first_stage_error = false; 783 access_type = MMU_DATA_LOAD; 784 } 785 786 qemu_log_mask(CPU_LOG_MMU, 787 "%s 1st-stage address=%" VADDR_PRIx " ret %d physical " 788 TARGET_FMT_plx " prot %d\n", 789 __func__, address, ret, pa, prot); 790 791 if (ret == TRANSLATE_SUCCESS) { 792 /* Second stage lookup */ 793 im_address = pa; 794 795 ret = get_physical_address(env, &pa, &prot2, im_address, NULL, 796 access_type, mmu_idx, false, true, 797 false); 798 799 qemu_log_mask(CPU_LOG_MMU, 800 "%s 2nd-stage address=%" VADDR_PRIx " ret %d physical " 801 TARGET_FMT_plx " prot %d\n", 802 __func__, im_address, ret, pa, prot2); 803 804 prot &= prot2; 805 806 if (ret == TRANSLATE_SUCCESS) { 807 ret = get_physical_address_pmp(env, &prot_pmp, &tlb_size, pa, 808 size, access_type, mode); 809 810 qemu_log_mask(CPU_LOG_MMU, 811 "%s PMP address=" TARGET_FMT_plx " ret %d prot" 812 " %d tlb_size " TARGET_FMT_lu "\n", 813 __func__, pa, ret, prot_pmp, tlb_size); 814 815 prot &= prot_pmp; 816 } 817 818 if (ret != TRANSLATE_SUCCESS) { 819 /* 820 * Guest physical address translation failed, this is a HS 821 * level exception 822 */ 823 first_stage_error = false; 824 env->guest_phys_fault_addr = (im_address | 825 (address & 826 (TARGET_PAGE_SIZE - 1))) >> 2; 827 } 828 } 829 } else { 830 /* Single stage lookup */ 831 ret = get_physical_address(env, &pa, &prot, address, NULL, 832 access_type, mmu_idx, true, false, false); 833 834 qemu_log_mask(CPU_LOG_MMU, 835 "%s address=%" VADDR_PRIx " ret %d physical " 836 TARGET_FMT_plx " prot %d\n", 837 __func__, address, ret, pa, prot); 838 839 if (ret == TRANSLATE_SUCCESS) { 840 ret = get_physical_address_pmp(env, &prot_pmp, &tlb_size, pa, 841 size, access_type, mode); 842 843 qemu_log_mask(CPU_LOG_MMU, 844 "%s PMP address=" TARGET_FMT_plx " ret %d prot" 845 " %d tlb_size " TARGET_FMT_lu "\n", 846 __func__, pa, ret, prot_pmp, tlb_size); 847 848 prot &= prot_pmp; 849 } 850 } 851 852 if (ret == TRANSLATE_PMP_FAIL) { 853 pmp_violation = true; 854 } 855 856 if (ret == TRANSLATE_SUCCESS) { 857 tlb_set_page(cs, address & ~(tlb_size - 1), pa & ~(tlb_size - 1), 858 prot, mmu_idx, tlb_size); 859 return true; 860 } else if (probe) { 861 return false; 862 } else { 863 raise_mmu_exception(env, address, access_type, pmp_violation, 864 first_stage_error, 865 riscv_cpu_virt_enabled(env) || 866 riscv_cpu_two_stage_lookup(mmu_idx)); 867 riscv_raise_exception(env, cs->exception_index, retaddr); 868 } 869 870 return true; 871 872 #else 873 switch (access_type) { 874 case MMU_INST_FETCH: 875 cs->exception_index = RISCV_EXCP_INST_PAGE_FAULT; 876 break; 877 case MMU_DATA_LOAD: 878 cs->exception_index = RISCV_EXCP_LOAD_PAGE_FAULT; 879 break; 880 case MMU_DATA_STORE: 881 cs->exception_index = RISCV_EXCP_STORE_PAGE_FAULT; 882 break; 883 default: 884 g_assert_not_reached(); 885 } 886 env->badaddr = address; 887 cpu_loop_exit_restore(cs, retaddr); 888 #endif 889 } 890 891 /* 892 * Handle Traps 893 * 894 * Adapted from Spike's processor_t::take_trap. 895 * 896 */ 897 void riscv_cpu_do_interrupt(CPUState *cs) 898 { 899 #if !defined(CONFIG_USER_ONLY) 900 901 RISCVCPU *cpu = RISCV_CPU(cs); 902 CPURISCVState *env = &cpu->env; 903 bool force_hs_execp = riscv_cpu_force_hs_excep_enabled(env); 904 uint64_t s; 905 906 /* cs->exception is 32-bits wide unlike mcause which is XLEN-bits wide 907 * so we mask off the MSB and separate into trap type and cause. 908 */ 909 bool async = !!(cs->exception_index & RISCV_EXCP_INT_FLAG); 910 target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK; 911 target_ulong deleg = async ? env->mideleg : env->medeleg; 912 bool write_tval = false; 913 target_ulong tval = 0; 914 target_ulong htval = 0; 915 target_ulong mtval2 = 0; 916 917 if (cause == RISCV_EXCP_SEMIHOST) { 918 if (env->priv >= PRV_S) { 919 env->gpr[xA0] = do_common_semihosting(cs); 920 env->pc += 4; 921 return; 922 } 923 cause = RISCV_EXCP_BREAKPOINT; 924 } 925 926 if (!async) { 927 /* set tval to badaddr for traps with address information */ 928 switch (cause) { 929 case RISCV_EXCP_INST_GUEST_PAGE_FAULT: 930 case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT: 931 case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT: 932 force_hs_execp = true; 933 /* fallthrough */ 934 case RISCV_EXCP_INST_ADDR_MIS: 935 case RISCV_EXCP_INST_ACCESS_FAULT: 936 case RISCV_EXCP_LOAD_ADDR_MIS: 937 case RISCV_EXCP_STORE_AMO_ADDR_MIS: 938 case RISCV_EXCP_LOAD_ACCESS_FAULT: 939 case RISCV_EXCP_STORE_AMO_ACCESS_FAULT: 940 case RISCV_EXCP_INST_PAGE_FAULT: 941 case RISCV_EXCP_LOAD_PAGE_FAULT: 942 case RISCV_EXCP_STORE_PAGE_FAULT: 943 write_tval = true; 944 tval = env->badaddr; 945 break; 946 default: 947 break; 948 } 949 /* ecall is dispatched as one cause so translate based on mode */ 950 if (cause == RISCV_EXCP_U_ECALL) { 951 assert(env->priv <= 3); 952 953 if (env->priv == PRV_M) { 954 cause = RISCV_EXCP_M_ECALL; 955 } else if (env->priv == PRV_S && riscv_cpu_virt_enabled(env)) { 956 cause = RISCV_EXCP_VS_ECALL; 957 } else if (env->priv == PRV_S && !riscv_cpu_virt_enabled(env)) { 958 cause = RISCV_EXCP_S_ECALL; 959 } else if (env->priv == PRV_U) { 960 cause = RISCV_EXCP_U_ECALL; 961 } 962 } 963 } 964 965 trace_riscv_trap(env->mhartid, async, cause, env->pc, tval, 966 riscv_cpu_get_trap_name(cause, async)); 967 968 qemu_log_mask(CPU_LOG_INT, 969 "%s: hart:"TARGET_FMT_ld", async:%d, cause:"TARGET_FMT_lx", " 970 "epc:0x"TARGET_FMT_lx", tval:0x"TARGET_FMT_lx", desc=%s\n", 971 __func__, env->mhartid, async, cause, env->pc, tval, 972 riscv_cpu_get_trap_name(cause, async)); 973 974 if (env->priv <= PRV_S && 975 cause < TARGET_LONG_BITS && ((deleg >> cause) & 1)) { 976 /* handle the trap in S-mode */ 977 if (riscv_has_ext(env, RVH)) { 978 target_ulong hdeleg = async ? env->hideleg : env->hedeleg; 979 980 if (env->two_stage_lookup && write_tval) { 981 /* 982 * If we are writing a guest virtual address to stval, set 983 * this to 1. If we are trapping to VS we will set this to 0 984 * later. 985 */ 986 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 1); 987 } else { 988 /* For other HS-mode traps, we set this to 0. */ 989 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0); 990 } 991 992 if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1) && 993 !force_hs_execp) { 994 /* Trap to VS mode */ 995 /* 996 * See if we need to adjust cause. Yes if its VS mode interrupt 997 * no if hypervisor has delegated one of hs mode's interrupt 998 */ 999 if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT || 1000 cause == IRQ_VS_EXT) { 1001 cause = cause - 1; 1002 } 1003 env->hstatus = set_field(env->hstatus, HSTATUS_GVA, 0); 1004 } else if (riscv_cpu_virt_enabled(env)) { 1005 /* Trap into HS mode, from virt */ 1006 riscv_cpu_swap_hypervisor_regs(env); 1007 env->hstatus = set_field(env->hstatus, HSTATUS_SPVP, 1008 env->priv); 1009 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, 1010 riscv_cpu_virt_enabled(env)); 1011 1012 htval = env->guest_phys_fault_addr; 1013 1014 riscv_cpu_set_virt_enabled(env, 0); 1015 riscv_cpu_set_force_hs_excep(env, 0); 1016 } else { 1017 /* Trap into HS mode */ 1018 env->hstatus = set_field(env->hstatus, HSTATUS_SPV, false); 1019 htval = env->guest_phys_fault_addr; 1020 } 1021 } 1022 1023 s = env->mstatus; 1024 s = set_field(s, MSTATUS_SPIE, get_field(s, MSTATUS_SIE)); 1025 s = set_field(s, MSTATUS_SPP, env->priv); 1026 s = set_field(s, MSTATUS_SIE, 0); 1027 env->mstatus = s; 1028 env->scause = cause | ((target_ulong)async << (TARGET_LONG_BITS - 1)); 1029 env->sepc = env->pc; 1030 env->stval = tval; 1031 env->htval = htval; 1032 env->pc = (env->stvec >> 2 << 2) + 1033 ((async && (env->stvec & 3) == 1) ? cause * 4 : 0); 1034 riscv_cpu_set_mode(env, PRV_S); 1035 } else { 1036 /* handle the trap in M-mode */ 1037 if (riscv_has_ext(env, RVH)) { 1038 if (riscv_cpu_virt_enabled(env)) { 1039 riscv_cpu_swap_hypervisor_regs(env); 1040 } 1041 env->mstatus = set_field(env->mstatus, MSTATUS_MPV, 1042 riscv_cpu_virt_enabled(env)); 1043 if (riscv_cpu_virt_enabled(env) && tval) { 1044 env->mstatus = set_field(env->mstatus, MSTATUS_GVA, 1); 1045 } 1046 1047 mtval2 = env->guest_phys_fault_addr; 1048 1049 /* Trapping to M mode, virt is disabled */ 1050 riscv_cpu_set_virt_enabled(env, 0); 1051 riscv_cpu_set_force_hs_excep(env, 0); 1052 } 1053 1054 s = env->mstatus; 1055 s = set_field(s, MSTATUS_MPIE, get_field(s, MSTATUS_MIE)); 1056 s = set_field(s, MSTATUS_MPP, env->priv); 1057 s = set_field(s, MSTATUS_MIE, 0); 1058 env->mstatus = s; 1059 env->mcause = cause | ~(((target_ulong)-1) >> async); 1060 env->mepc = env->pc; 1061 env->mtval = tval; 1062 env->mtval2 = mtval2; 1063 env->pc = (env->mtvec >> 2 << 2) + 1064 ((async && (env->mtvec & 3) == 1) ? cause * 4 : 0); 1065 riscv_cpu_set_mode(env, PRV_M); 1066 } 1067 1068 /* NOTE: it is not necessary to yield load reservations here. It is only 1069 * necessary for an SC from "another hart" to cause a load reservation 1070 * to be yielded. Refer to the memory consistency model section of the 1071 * RISC-V ISA Specification. 1072 */ 1073 1074 env->two_stage_lookup = false; 1075 #endif 1076 cs->exception_index = RISCV_EXCP_NONE; /* mark handled to qemu */ 1077 } 1078