utility.cc revision 13500
1/* 2 * Copyright (c) 2009-2014, 2016-2018 ARM Limited 3 * All rights reserved. 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Ali Saidi 38 */ 39 40#include "arch/arm/utility.hh" 41 42#include <memory> 43 44#include "arch/arm/faults.hh" 45#include "arch/arm/isa_traits.hh" 46#include "arch/arm/system.hh" 47#include "arch/arm/tlb.hh" 48#include "arch/arm/vtophys.hh" 49#include "cpu/base.hh" 50#include "cpu/checker/cpu.hh" 51#include "cpu/thread_context.hh" 52#include "mem/fs_translating_port_proxy.hh" 53#include "sim/full_system.hh" 54 55namespace ArmISA { 56 57void 58initCPU(ThreadContext *tc, int cpuId) 59{ 60 // Reset CP15?? What does that mean -- ali 61 62 // FPEXC.EN = 0 63 64 static Fault reset = std::make_shared<Reset>(); 65 reset->invoke(tc); 66} 67 68uint64_t 69getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp) 70{ 71 if (!FullSystem) { 72 panic("getArgument() only implemented for full system mode.\n"); 73 M5_DUMMY_RETURN 74 } 75 76 if (fp) 77 panic("getArgument(): Floating point arguments not implemented\n"); 78 79 if (inAArch64(tc)) { 80 if (size == (uint16_t)(-1)) 81 size = sizeof(uint64_t); 82 83 if (number < 8 /*NumArgumentRegs64*/) { 84 return tc->readIntReg(number); 85 } else { 86 panic("getArgument(): No support reading stack args for AArch64\n"); 87 } 88 } else { 89 if (size == (uint16_t)(-1)) 90 // todo: should this not be sizeof(uint32_t) rather? 91 size = ArmISA::MachineBytes; 92 93 if (number < NumArgumentRegs) { 94 // If the argument is 64 bits, it must be in an even regiser 95 // number. Increment the number here if it isn't even. 96 if (size == sizeof(uint64_t)) { 97 if ((number % 2) != 0) 98 number++; 99 // Read the two halves of the data. Number is inc here to 100 // get the second half of the 64 bit reg. 101 uint64_t tmp; 102 tmp = tc->readIntReg(number++); 103 tmp |= tc->readIntReg(number) << 32; 104 return tmp; 105 } else { 106 return tc->readIntReg(number); 107 } 108 } else { 109 Addr sp = tc->readIntReg(StackPointerReg); 110 FSTranslatingPortProxy &vp = tc->getVirtProxy(); 111 uint64_t arg; 112 if (size == sizeof(uint64_t)) { 113 // If the argument is even it must be aligned 114 if ((number % 2) != 0) 115 number++; 116 arg = vp.read<uint64_t>(sp + 117 (number-NumArgumentRegs) * sizeof(uint32_t)); 118 // since two 32 bit args == 1 64 bit arg, increment number 119 number++; 120 } else { 121 arg = vp.read<uint32_t>(sp + 122 (number-NumArgumentRegs) * sizeof(uint32_t)); 123 } 124 return arg; 125 } 126 } 127 panic("getArgument() should always return\n"); 128} 129 130void 131skipFunction(ThreadContext *tc) 132{ 133 PCState newPC = tc->pcState(); 134 if (inAArch64(tc)) { 135 newPC.set(tc->readIntReg(INTREG_X30)); 136 } else { 137 newPC.set(tc->readIntReg(ReturnAddressReg) & ~ULL(1)); 138 } 139 140 CheckerCPU *checker = tc->getCheckerCpuPtr(); 141 if (checker) { 142 tc->pcStateNoRecord(newPC); 143 } else { 144 tc->pcState(newPC); 145 } 146} 147 148void 149copyRegs(ThreadContext *src, ThreadContext *dest) 150{ 151 for (int i = 0; i < NumIntRegs; i++) 152 dest->setIntRegFlat(i, src->readIntRegFlat(i)); 153 154 for (int i = 0; i < NumFloatRegs; i++) 155 dest->setFloatRegBitsFlat(i, src->readFloatRegBitsFlat(i)); 156 157 for (int i = 0; i < NumVecRegs; i++) 158 dest->setVecRegFlat(i, src->readVecRegFlat(i)); 159 160 for (int i = 0; i < NumCCRegs; i++) 161 dest->setCCReg(i, src->readCCReg(i)); 162 163 for (int i = 0; i < NumMiscRegs; i++) 164 dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i)); 165 166 // setMiscReg "with effect" will set the misc register mapping correctly. 167 // e.g. updateRegMap(val) 168 dest->setMiscReg(MISCREG_CPSR, src->readMiscRegNoEffect(MISCREG_CPSR)); 169 170 // Copy over the PC State 171 dest->pcState(src->pcState()); 172 173 // Invalidate the tlb misc register cache 174 dynamic_cast<TLB *>(dest->getITBPtr())->invalidateMiscReg(); 175 dynamic_cast<TLB *>(dest->getDTBPtr())->invalidateMiscReg(); 176} 177 178bool 179inSecureState(ThreadContext *tc) 180{ 181 SCR scr = inAArch64(tc) ? tc->readMiscReg(MISCREG_SCR_EL3) : 182 tc->readMiscReg(MISCREG_SCR); 183 return ArmSystem::haveSecurity(tc) && inSecureState( 184 scr, tc->readMiscReg(MISCREG_CPSR)); 185} 186 187inline bool 188isSecureBelowEL3(ThreadContext *tc) 189{ 190 SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); 191 return ArmSystem::haveEL(tc, EL3) && scr.ns == 0; 192} 193 194bool 195inAArch64(ThreadContext *tc) 196{ 197 CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); 198 return opModeIs64((OperatingMode) (uint8_t) cpsr.mode); 199} 200 201bool 202longDescFormatInUse(ThreadContext *tc) 203{ 204 TTBCR ttbcr = tc->readMiscReg(MISCREG_TTBCR); 205 return ArmSystem::haveLPAE(tc) && ttbcr.eae; 206} 207 208uint32_t 209getMPIDR(ArmSystem *arm_sys, ThreadContext *tc) 210{ 211 // Multiprocessor Affinity Register MPIDR from Cortex(tm)-A15 Technical 212 // Reference Manual 213 // 214 // bit 31 - Multi-processor extensions available 215 // bit 30 - Uni-processor system 216 // bit 24 - Multi-threaded cores 217 // bit 11-8 - Cluster ID 218 // bit 1-0 - CPU ID 219 // 220 // We deliberately extend both the Cluster ID and CPU ID fields to allow 221 // for simulation of larger systems 222 assert((0 <= tc->cpuId()) && (tc->cpuId() < 256)); 223 assert(tc->socketId() < 65536); 224 if (arm_sys->multiThread) { 225 return 0x80000000 | // multiprocessor extensions available 226 0x01000000 | // multi-threaded cores 227 tc->contextId(); 228 } else if (arm_sys->multiProc) { 229 return 0x80000000 | // multiprocessor extensions available 230 tc->cpuId() | tc->socketId() << 8; 231 } else { 232 return 0x80000000 | // multiprocessor extensions available 233 0x40000000 | // in up system 234 tc->cpuId() | tc->socketId() << 8; 235 } 236} 237 238bool 239ELIs64(ThreadContext *tc, ExceptionLevel el) 240{ 241 return !ELIs32(tc, el); 242} 243 244bool 245ELIs32(ThreadContext *tc, ExceptionLevel el) 246{ 247 bool known, aarch32; 248 std::tie(known, aarch32) = ELUsingAArch32K(tc, el); 249 panic_if(!known, "EL state is UNKNOWN"); 250 return aarch32; 251} 252 253std::pair<bool, bool> 254ELUsingAArch32K(ThreadContext *tc, ExceptionLevel el) 255{ 256 // Return true if the specified EL is in aarch32 state. 257 const bool have_el3 = ArmSystem::haveSecurity(tc); 258 const bool have_el2 = ArmSystem::haveVirtualization(tc); 259 260 panic_if(el == EL2 && !have_el2, "Asking for EL2 when it doesn't exist"); 261 panic_if(el == EL3 && !have_el3, "Asking for EL3 when it doesn't exist"); 262 263 bool known, aarch32; 264 known = aarch32 = false; 265 if (ArmSystem::highestELIs64(tc) && ArmSystem::highestEL(tc) == el) { 266 // Target EL is the highest one in a system where 267 // the highest is using AArch64. 268 known = true; aarch32 = false; 269 } else if (!ArmSystem::highestELIs64(tc)) { 270 // All ELs are using AArch32: 271 known = true; aarch32 = true; 272 } else { 273 SCR scr = tc->readMiscReg(MISCREG_SCR_EL3); 274 bool aarch32_below_el3 = (have_el3 && scr.rw == 0); 275 276 HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2); 277 bool aarch32_at_el1 = (aarch32_below_el3 278 || (have_el2 279 && !isSecureBelowEL3(tc) && hcr.rw == 0)); 280 281 // Only know if EL0 using AArch32 from PSTATE 282 if (el == EL0 && !aarch32_at_el1) { 283 // EL0 controlled by PSTATE 284 CPSR cpsr = tc->readMiscReg(MISCREG_CPSR); 285 286 known = (cpsr.el == EL0); 287 aarch32 = (cpsr.width == 1); 288 } else { 289 known = true; 290 aarch32 = (aarch32_below_el3 && el != EL3) 291 || (aarch32_at_el1 && (el == EL0 || el == EL1) ); 292 } 293 } 294 295 return std::make_pair(known, aarch32); 296} 297 298bool 299isBigEndian64(ThreadContext *tc) 300{ 301 switch (opModeToEL(currOpMode(tc))) { 302 case EL3: 303 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL3)).ee; 304 case EL2: 305 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL2)).ee; 306 case EL1: 307 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).ee; 308 case EL0: 309 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).e0e; 310 default: 311 panic("Invalid exception level"); 312 break; 313 } 314} 315 316bool 317badMode32(ThreadContext *tc, OperatingMode mode) 318{ 319 return unknownMode32(mode) || !ArmSystem::haveEL(tc, opModeToEL(mode)); 320} 321 322bool 323badMode(ThreadContext *tc, OperatingMode mode) 324{ 325 return unknownMode(mode) || !ArmSystem::haveEL(tc, opModeToEL(mode)); 326} 327 328Addr 329purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el, 330 TTBCR tcr) 331{ 332 switch (el) { 333 case EL0: 334 case EL1: 335 if (bits(addr, 55, 48) == 0xFF && tcr.tbi1) 336 return addr | mask(63, 55); 337 else if (!bits(addr, 55, 48) && tcr.tbi0) 338 return bits(addr,55, 0); 339 break; 340 case EL2: 341 assert(ArmSystem::haveVirtualization(tc)); 342 tcr = tc->readMiscReg(MISCREG_TCR_EL2); 343 if (tcr.tbi) 344 return addr & mask(56); 345 break; 346 case EL3: 347 assert(ArmSystem::haveSecurity(tc)); 348 if (tcr.tbi) 349 return addr & mask(56); 350 break; 351 default: 352 panic("Invalid exception level"); 353 break; 354 } 355 356 return addr; // Nothing to do if this is not a tagged address 357} 358 359Addr 360purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el) 361{ 362 TTBCR tcr; 363 364 switch (el) { 365 case EL0: 366 case EL1: 367 tcr = tc->readMiscReg(MISCREG_TCR_EL1); 368 if (bits(addr, 55, 48) == 0xFF && tcr.tbi1) 369 return addr | mask(63, 55); 370 else if (!bits(addr, 55, 48) && tcr.tbi0) 371 return bits(addr,55, 0); 372 break; 373 case EL2: 374 assert(ArmSystem::haveVirtualization(tc)); 375 tcr = tc->readMiscReg(MISCREG_TCR_EL2); 376 if (tcr.tbi) 377 return addr & mask(56); 378 break; 379 case EL3: 380 assert(ArmSystem::haveSecurity(tc)); 381 tcr = tc->readMiscReg(MISCREG_TCR_EL3); 382 if (tcr.tbi) 383 return addr & mask(56); 384 break; 385 default: 386 panic("Invalid exception level"); 387 break; 388 } 389 390 return addr; // Nothing to do if this is not a tagged address 391} 392 393Addr 394truncPage(Addr addr) 395{ 396 return addr & ~(PageBytes - 1); 397} 398 399Addr 400roundPage(Addr addr) 401{ 402 return (addr + PageBytes - 1) & ~(PageBytes - 1); 403} 404 405bool 406mcrMrc15TrapToHyp(const MiscRegIndex miscReg, HCR hcr, CPSR cpsr, SCR scr, 407 HDCR hdcr, HSTR hstr, HCPTR hcptr, uint32_t iss) 408{ 409 bool isRead; 410 uint32_t crm; 411 IntRegIndex rt; 412 uint32_t crn; 413 uint32_t opc1; 414 uint32_t opc2; 415 bool trapToHype = false; 416 417 418 if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { 419 mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2); 420 trapToHype = ((uint32_t) hstr) & (1 << crn); 421 trapToHype |= hdcr.tpm && (crn == 9) && (crm >= 12); 422 trapToHype |= hcr.tidcp && ( 423 ((crn == 9) && ((crm <= 2) || ((crm >= 5) && (crm <= 8)))) || 424 ((crn == 10) && ((crm <= 1) || (crm == 4) || (crm == 8))) || 425 ((crn == 11) && ((crm <= 8) || (crm == 15))) ); 426 427 if (!trapToHype) { 428 switch (unflattenMiscReg(miscReg)) { 429 case MISCREG_CPACR: 430 trapToHype = hcptr.tcpac; 431 break; 432 case MISCREG_REVIDR: 433 case MISCREG_TCMTR: 434 case MISCREG_TLBTR: 435 case MISCREG_AIDR: 436 trapToHype = hcr.tid1; 437 break; 438 case MISCREG_CTR: 439 case MISCREG_CCSIDR: 440 case MISCREG_CLIDR: 441 case MISCREG_CSSELR: 442 trapToHype = hcr.tid2; 443 break; 444 case MISCREG_ID_PFR0: 445 case MISCREG_ID_PFR1: 446 case MISCREG_ID_DFR0: 447 case MISCREG_ID_AFR0: 448 case MISCREG_ID_MMFR0: 449 case MISCREG_ID_MMFR1: 450 case MISCREG_ID_MMFR2: 451 case MISCREG_ID_MMFR3: 452 case MISCREG_ID_ISAR0: 453 case MISCREG_ID_ISAR1: 454 case MISCREG_ID_ISAR2: 455 case MISCREG_ID_ISAR3: 456 case MISCREG_ID_ISAR4: 457 case MISCREG_ID_ISAR5: 458 trapToHype = hcr.tid3; 459 break; 460 case MISCREG_DCISW: 461 case MISCREG_DCCSW: 462 case MISCREG_DCCISW: 463 trapToHype = hcr.tsw; 464 break; 465 case MISCREG_DCIMVAC: 466 case MISCREG_DCCIMVAC: 467 case MISCREG_DCCMVAC: 468 trapToHype = hcr.tpc; 469 break; 470 case MISCREG_ICIMVAU: 471 case MISCREG_ICIALLU: 472 case MISCREG_ICIALLUIS: 473 case MISCREG_DCCMVAU: 474 trapToHype = hcr.tpu; 475 break; 476 case MISCREG_TLBIALLIS: 477 case MISCREG_TLBIMVAIS: 478 case MISCREG_TLBIASIDIS: 479 case MISCREG_TLBIMVAAIS: 480 case MISCREG_TLBIMVALIS: 481 case MISCREG_TLBIMVAALIS: 482 case MISCREG_DTLBIALL: 483 case MISCREG_ITLBIALL: 484 case MISCREG_DTLBIMVA: 485 case MISCREG_ITLBIMVA: 486 case MISCREG_DTLBIASID: 487 case MISCREG_ITLBIASID: 488 case MISCREG_TLBIMVAA: 489 case MISCREG_TLBIALL: 490 case MISCREG_TLBIMVA: 491 case MISCREG_TLBIMVAL: 492 case MISCREG_TLBIMVAAL: 493 case MISCREG_TLBIASID: 494 trapToHype = hcr.ttlb; 495 break; 496 case MISCREG_ACTLR: 497 trapToHype = hcr.tac; 498 break; 499 case MISCREG_SCTLR: 500 case MISCREG_TTBR0: 501 case MISCREG_TTBR1: 502 case MISCREG_TTBCR: 503 case MISCREG_DACR: 504 case MISCREG_DFSR: 505 case MISCREG_IFSR: 506 case MISCREG_DFAR: 507 case MISCREG_IFAR: 508 case MISCREG_ADFSR: 509 case MISCREG_AIFSR: 510 case MISCREG_PRRR: 511 case MISCREG_NMRR: 512 case MISCREG_MAIR0: 513 case MISCREG_MAIR1: 514 case MISCREG_CONTEXTIDR: 515 trapToHype = hcr.tvm & !isRead; 516 break; 517 case MISCREG_PMCR: 518 trapToHype = hdcr.tpmcr; 519 break; 520 // No default action needed 521 default: 522 break; 523 } 524 } 525 } 526 return trapToHype; 527} 528 529 530bool 531mcrMrc14TrapToHyp(const MiscRegIndex miscReg, HCR hcr, CPSR cpsr, SCR scr, 532 HDCR hdcr, HSTR hstr, HCPTR hcptr, uint32_t iss) 533{ 534 bool isRead; 535 uint32_t crm; 536 IntRegIndex rt; 537 uint32_t crn; 538 uint32_t opc1; 539 uint32_t opc2; 540 bool trapToHype = false; 541 542 if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { 543 mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2); 544 inform("trap check M:%x N:%x 1:%x 2:%x hdcr %x, hcptr %x, hstr %x\n", 545 crm, crn, opc1, opc2, hdcr, hcptr, hstr); 546 trapToHype = hdcr.tda && (opc1 == 0); 547 trapToHype |= hcptr.tta && (opc1 == 1); 548 if (!trapToHype) { 549 switch (unflattenMiscReg(miscReg)) { 550 case MISCREG_DBGOSLSR: 551 case MISCREG_DBGOSLAR: 552 case MISCREG_DBGOSDLR: 553 case MISCREG_DBGPRCR: 554 trapToHype = hdcr.tdosa; 555 break; 556 case MISCREG_DBGDRAR: 557 case MISCREG_DBGDSAR: 558 trapToHype = hdcr.tdra; 559 break; 560 case MISCREG_JIDR: 561 trapToHype = hcr.tid0; 562 break; 563 case MISCREG_JOSCR: 564 case MISCREG_JMCR: 565 trapToHype = hstr.tjdbx; 566 break; 567 case MISCREG_TEECR: 568 case MISCREG_TEEHBR: 569 trapToHype = hstr.ttee; 570 break; 571 // No default action needed 572 default: 573 break; 574 } 575 } 576 } 577 return trapToHype; 578} 579 580bool 581mcrrMrrc15TrapToHyp(const MiscRegIndex miscReg, CPSR cpsr, SCR scr, HSTR hstr, 582 HCR hcr, uint32_t iss) 583{ 584 uint32_t crm; 585 IntRegIndex rt; 586 uint32_t crn; 587 uint32_t opc1; 588 uint32_t opc2; 589 bool isRead; 590 bool trapToHype = false; 591 592 if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) { 593 // This is technically the wrong function, but we can re-use it for 594 // the moment because we only need one field, which overlaps with the 595 // mcrmrc layout 596 mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2); 597 trapToHype = ((uint32_t) hstr) & (1 << crm); 598 599 if (!trapToHype) { 600 switch (unflattenMiscReg(miscReg)) { 601 case MISCREG_SCTLR: 602 case MISCREG_TTBR0: 603 case MISCREG_TTBR1: 604 case MISCREG_TTBCR: 605 case MISCREG_DACR: 606 case MISCREG_DFSR: 607 case MISCREG_IFSR: 608 case MISCREG_DFAR: 609 case MISCREG_IFAR: 610 case MISCREG_ADFSR: 611 case MISCREG_AIFSR: 612 case MISCREG_PRRR: 613 case MISCREG_NMRR: 614 case MISCREG_MAIR0: 615 case MISCREG_MAIR1: 616 case MISCREG_CONTEXTIDR: 617 trapToHype = hcr.tvm & !isRead; 618 break; 619 // No default action needed 620 default: 621 break; 622 } 623 } 624 } 625 return trapToHype; 626} 627 628bool 629decodeMrsMsrBankedReg(uint8_t sysM, bool r, bool &isIntReg, int ®Idx, 630 CPSR cpsr, SCR scr, NSACR nsacr, bool checkSecurity) 631{ 632 OperatingMode mode = MODE_UNDEFINED; 633 bool ok = true; 634 635 // R mostly indicates if its a int register or a misc reg, we override 636 // below if the few corner cases 637 isIntReg = !r; 638 // Loosely based on ARM ARM issue C section B9.3.10 639 if (r) { 640 switch (sysM) 641 { 642 case 0xE: 643 regIdx = MISCREG_SPSR_FIQ; 644 mode = MODE_FIQ; 645 break; 646 case 0x10: 647 regIdx = MISCREG_SPSR_IRQ; 648 mode = MODE_IRQ; 649 break; 650 case 0x12: 651 regIdx = MISCREG_SPSR_SVC; 652 mode = MODE_SVC; 653 break; 654 case 0x14: 655 regIdx = MISCREG_SPSR_ABT; 656 mode = MODE_ABORT; 657 break; 658 case 0x16: 659 regIdx = MISCREG_SPSR_UND; 660 mode = MODE_UNDEFINED; 661 break; 662 case 0x1C: 663 regIdx = MISCREG_SPSR_MON; 664 mode = MODE_MON; 665 break; 666 case 0x1E: 667 regIdx = MISCREG_SPSR_HYP; 668 mode = MODE_HYP; 669 break; 670 default: 671 ok = false; 672 break; 673 } 674 } else { 675 int sysM4To3 = bits(sysM, 4, 3); 676 677 if (sysM4To3 == 0) { 678 mode = MODE_USER; 679 regIdx = intRegInMode(mode, bits(sysM, 2, 0) + 8); 680 } else if (sysM4To3 == 1) { 681 mode = MODE_FIQ; 682 regIdx = intRegInMode(mode, bits(sysM, 2, 0) + 8); 683 } else if (sysM4To3 == 3) { 684 if (bits(sysM, 1) == 0) { 685 mode = MODE_MON; 686 regIdx = intRegInMode(mode, 14 - bits(sysM, 0)); 687 } else { 688 mode = MODE_HYP; 689 if (bits(sysM, 0) == 1) { 690 regIdx = intRegInMode(mode, 13); // R13 in HYP 691 } else { 692 isIntReg = false; 693 regIdx = MISCREG_ELR_HYP; 694 } 695 } 696 } else { // Other Banked registers 697 int sysM2 = bits(sysM, 2); 698 int sysM1 = bits(sysM, 1); 699 700 mode = (OperatingMode) ( ((sysM2 || sysM1) << 0) | 701 (1 << 1) | 702 ((sysM2 && !sysM1) << 2) | 703 ((sysM2 && sysM1) << 3) | 704 (1 << 4) ); 705 regIdx = intRegInMode(mode, 14 - bits(sysM, 0)); 706 // Don't flatten the register here. This is going to go through 707 // setIntReg() which will do the flattening 708 ok &= mode != cpsr.mode; 709 } 710 } 711 712 // Check that the requested register is accessable from the current mode 713 if (ok && checkSecurity && mode != cpsr.mode) { 714 switch (cpsr.mode) 715 { 716 case MODE_USER: 717 ok = false; 718 break; 719 case MODE_FIQ: 720 ok &= mode != MODE_HYP; 721 ok &= (mode != MODE_MON) || !scr.ns; 722 break; 723 case MODE_HYP: 724 ok &= mode != MODE_MON; 725 ok &= (mode != MODE_FIQ) || !nsacr.rfr; 726 break; 727 case MODE_IRQ: 728 case MODE_SVC: 729 case MODE_ABORT: 730 case MODE_UNDEFINED: 731 case MODE_SYSTEM: 732 ok &= mode != MODE_HYP; 733 ok &= (mode != MODE_MON) || !scr.ns; 734 ok &= (mode != MODE_FIQ) || !nsacr.rfr; 735 break; 736 // can access everything, no further checks required 737 case MODE_MON: 738 break; 739 default: 740 panic("unknown Mode 0x%x\n", cpsr.mode); 741 break; 742 } 743 } 744 return (ok); 745} 746 747bool 748SPAlignmentCheckEnabled(ThreadContext* tc) 749{ 750 switch (opModeToEL(currOpMode(tc))) { 751 case EL3: 752 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL3)).sa; 753 case EL2: 754 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL2)).sa; 755 case EL1: 756 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).sa; 757 case EL0: 758 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).sa0; 759 default: 760 panic("Invalid exception level"); 761 break; 762 } 763} 764 765int 766decodePhysAddrRange64(uint8_t pa_enc) 767{ 768 switch (pa_enc) { 769 case 0x0: 770 return 32; 771 case 0x1: 772 return 36; 773 case 0x2: 774 return 40; 775 case 0x3: 776 return 42; 777 case 0x4: 778 return 44; 779 case 0x5: 780 case 0x6: 781 case 0x7: 782 return 48; 783 default: 784 panic("Invalid phys. address range encoding"); 785 } 786} 787 788uint8_t 789encodePhysAddrRange64(int pa_size) 790{ 791 switch (pa_size) { 792 case 32: 793 return 0x0; 794 case 36: 795 return 0x1; 796 case 40: 797 return 0x2; 798 case 42: 799 return 0x3; 800 case 44: 801 return 0x4; 802 case 48: 803 return 0x5; 804 default: 805 panic("Invalid phys. address range"); 806 } 807} 808 809} // namespace ArmISA 810