faults.cc revision 8232
1/* 2 * Copyright (c) 2003-2005 The Regents of The University of Michigan 3 * Copyright (c) 2007 MIPS Technologies, Inc. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer; 10 * redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution; 13 * neither the name of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * Authors: Gabe Black 30 * Korey Sewell 31 * Jaidev Patwardhan 32 */ 33 34#include "arch/mips/faults.hh" 35#include "arch/mips/pra_constants.hh" 36#include "base/trace.hh" 37#include "cpu/base.hh" 38#include "cpu/thread_context.hh" 39#include "debug/MipsPRA.hh" 40 41#if !FULL_SYSTEM 42#include "mem/page_table.hh" 43#include "sim/process.hh" 44#endif 45 46namespace MipsISA 47{ 48 49FaultName MachineCheckFault::_name = "Machine Check"; 50FaultVect MachineCheckFault::_vect = 0x0401; 51FaultStat MachineCheckFault::_count; 52 53FaultName AlignmentFault::_name = "Alignment"; 54FaultVect AlignmentFault::_vect = 0x0301; 55FaultStat AlignmentFault::_count; 56 57FaultName ResetFault::_name = "Reset Fault"; 58#if FULL_SYSTEM 59FaultVect ResetFault::_vect = 0xBFC00000; 60#else 61FaultVect ResetFault::_vect = 0x001; 62#endif 63FaultStat ResetFault::_count; 64 65FaultName AddressErrorFault::_name = "Address Error"; 66FaultVect AddressErrorFault::_vect = 0x0180; 67FaultStat AddressErrorFault::_count; 68 69FaultName StoreAddressErrorFault::_name = "Store Address Error"; 70FaultVect StoreAddressErrorFault::_vect = 0x0180; 71FaultStat StoreAddressErrorFault::_count; 72 73 74FaultName SystemCallFault::_name = "Syscall"; 75FaultVect SystemCallFault::_vect = 0x0180; 76FaultStat SystemCallFault::_count; 77 78FaultName CoprocessorUnusableFault::_name = "Coprocessor Unusable Fault"; 79FaultVect CoprocessorUnusableFault::_vect = 0x180; 80FaultStat CoprocessorUnusableFault::_count; 81 82FaultName ReservedInstructionFault::_name = "Reserved Instruction Fault"; 83FaultVect ReservedInstructionFault::_vect = 0x0180; 84FaultStat ReservedInstructionFault::_count; 85 86FaultName ThreadFault::_name = "Thread Fault"; 87FaultVect ThreadFault::_vect = 0x00F1; 88FaultStat ThreadFault::_count; 89 90FaultName ArithmeticFault::_name = "Arithmetic Overflow Exception"; 91FaultVect ArithmeticFault::_vect = 0x180; 92FaultStat ArithmeticFault::_count; 93 94FaultName UnimplementedOpcodeFault::_name = "opdec"; 95FaultVect UnimplementedOpcodeFault::_vect = 0x0481; 96FaultStat UnimplementedOpcodeFault::_count; 97 98FaultName InterruptFault::_name = "interrupt"; 99FaultVect InterruptFault::_vect = 0x0180; 100FaultStat InterruptFault::_count; 101 102FaultName TrapFault::_name = "Trap"; 103FaultVect TrapFault::_vect = 0x0180; 104FaultStat TrapFault::_count; 105 106FaultName BreakpointFault::_name = "Breakpoint"; 107FaultVect BreakpointFault::_vect = 0x0180; 108FaultStat BreakpointFault::_count; 109 110FaultName ItbInvalidFault::_name = "Invalid TLB Entry Exception (I-Fetch/LW)"; 111FaultVect ItbInvalidFault::_vect = 0x0180; 112FaultStat ItbInvalidFault::_count; 113 114FaultName ItbPageFault::_name = "itbmiss"; 115FaultVect ItbPageFault::_vect = 0x0181; 116FaultStat ItbPageFault::_count; 117 118FaultName ItbMissFault::_name = "itbmiss"; 119FaultVect ItbMissFault::_vect = 0x0181; 120FaultStat ItbMissFault::_count; 121 122FaultName ItbAcvFault::_name = "iaccvio"; 123FaultVect ItbAcvFault::_vect = 0x0081; 124FaultStat ItbAcvFault::_count; 125 126FaultName ItbRefillFault::_name = "TLB Refill Exception (I-Fetch/LW)"; 127FaultVect ItbRefillFault::_vect = 0x0180; 128FaultStat ItbRefillFault::_count; 129 130FaultName NDtbMissFault::_name = "dtb_miss_single"; 131FaultVect NDtbMissFault::_vect = 0x0201; 132FaultStat NDtbMissFault::_count; 133 134FaultName PDtbMissFault::_name = "dtb_miss_double"; 135FaultVect PDtbMissFault::_vect = 0x0281; 136FaultStat PDtbMissFault::_count; 137 138FaultName DtbPageFault::_name = "dfault"; 139FaultVect DtbPageFault::_vect = 0x0381; 140FaultStat DtbPageFault::_count; 141 142FaultName DtbAcvFault::_name = "dfault"; 143FaultVect DtbAcvFault::_vect = 0x0381; 144FaultStat DtbAcvFault::_count; 145 146FaultName DtbInvalidFault::_name = "Invalid TLB Entry Exception (Store)"; 147FaultVect DtbInvalidFault::_vect = 0x0180; 148FaultStat DtbInvalidFault::_count; 149 150FaultName DtbRefillFault::_name = "TLB Refill Exception (Store)"; 151FaultVect DtbRefillFault::_vect = 0x0180; 152FaultStat DtbRefillFault::_count; 153 154FaultName TLBModifiedFault::_name = "TLB Modified Exception"; 155FaultVect TLBModifiedFault::_vect = 0x0180; 156FaultStat TLBModifiedFault::_count; 157 158FaultName FloatEnableFault::_name = "float_enable_fault"; 159FaultVect FloatEnableFault::_vect = 0x0581; 160FaultStat FloatEnableFault::_count; 161 162FaultName IntegerOverflowFault::_name = "Integer Overflow Fault"; 163FaultVect IntegerOverflowFault::_vect = 0x0501; 164FaultStat IntegerOverflowFault::_count; 165 166FaultName DspStateDisabledFault::_name = "DSP Disabled Fault"; 167FaultVect DspStateDisabledFault::_vect = 0x001a; 168FaultStat DspStateDisabledFault::_count; 169 170#if FULL_SYSTEM 171void 172MipsFault::setHandlerPC(Addr HandlerBase, ThreadContext *tc) 173{ 174 tc->setPC(HandlerBase); 175 tc->setNextPC(HandlerBase + sizeof(MachInst)); 176 tc->setNextNPC(HandlerBase + 2 * sizeof(MachInst)); 177} 178 179void 180MipsFault::setExceptionState(ThreadContext *tc, uint8_t excCode) 181{ 182 // modify SRS Ctl - Save CSS, put ESS into CSS 183 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 184 if (status.exl != 1 && status.bev != 1) { 185 // SRS Ctl is modified only if Status_EXL and Status_BEV are not set 186 SRSCtlReg srsCtl = tc->readMiscReg(MISCREG_SRSCTL); 187 srsCtl.pss = srsCtl.css; 188 srsCtl.css = srsCtl.ess; 189 tc->setMiscRegNoEffect(MISCREG_SRSCTL, srsCtl); 190 } 191 192 // set EXL bit (don't care if it is already set!) 193 status.exl = 1; 194 tc->setMiscRegNoEffect(MISCREG_STATUS, status); 195 196 // write EPC 197 // CHECK ME or FIXME or FIX ME or POSSIBLE HACK 198 // Check to see if the exception occurred in the branch delay slot 199 DPRINTF(MipsPRA, "PC: %x, NextPC: %x, NNPC: %x\n", 200 tc->readPC(), tc->readNextPC(), tc->readNextNPC()); 201 int bd = 0; 202 if (tc->readPC() + sizeof(MachInst) != tc->readNextPC()) { 203 tc->setMiscRegNoEffect(MISCREG_EPC, tc->readPC() - sizeof(MachInst)); 204 // In the branch delay slot? set CAUSE_31 205 bd = 1; 206 } else { 207 tc->setMiscRegNoEffect(MISCREG_EPC, tc->readPC()); 208 // In the branch delay slot? reset CAUSE_31 209 bd = 0; 210 } 211 212 // Set Cause_EXCCODE field 213 CauseReg cause = tc->readMiscReg(MISCREG_CAUSE); 214 cause.excCode = excCode; 215 cause.bd = bd; 216 cause.ce = 0; 217 tc->setMiscRegNoEffect(MISCREG_CAUSE, cause); 218} 219 220void 221ArithmeticFault::invoke(ThreadContext *tc, StaticInstPtr inst) 222{ 223 DPRINTF(MipsPRA, "%s encountered.\n", name()); 224 setExceptionState(tc, 0xC); 225 226 // Set new PC 227 Addr HandlerBase; 228 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 229 // Here, the handler is dependent on BEV, which is not modified by 230 // setExceptionState() 231 if (!status.bev) { 232 // See MIPS ARM Vol 3, Revision 2, Page 38 233 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 234 } else { 235 HandlerBase = 0xBFC00200; 236 } 237 setHandlerPC(HandlerBase, tc); 238} 239 240void 241StoreAddressErrorFault::invoke(ThreadContext *tc, StaticInstPtr inst) 242{ 243 DPRINTF(MipsPRA, "%s encountered.\n", name()); 244 setExceptionState(tc, 0x5); 245 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 246 247 // Set new PC 248 Addr HandlerBase; 249 // Offset 0x180 - General Exception Vector 250 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 251 setHandlerPC(HandlerBase, tc); 252} 253 254void 255TrapFault::invoke(ThreadContext *tc, StaticInstPtr inst) 256{ 257 DPRINTF(MipsPRA, "%s encountered.\n", name()); 258 setExceptionState(tc, 0xD); 259 260 // Set new PC 261 Addr HandlerBase; 262 // Offset 0x180 - General Exception Vector 263 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 264 setHandlerPC(HandlerBase, tc); 265} 266 267void 268BreakpointFault::invoke(ThreadContext *tc, StaticInstPtr inst) 269{ 270 setExceptionState(tc, 0x9); 271 272 // Set new PC 273 Addr HandlerBase; 274 // Offset 0x180 - General Exception Vector 275 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 276 setHandlerPC(HandlerBase, tc); 277} 278 279void 280DtbInvalidFault::invoke(ThreadContext *tc, StaticInstPtr inst) 281{ 282 DPRINTF(MipsPRA, "%s encountered.\n", name()); 283 284 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 285 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 286 entryHi.asid = entryHiAsid; 287 entryHi.vpn2 = entryHiVPN2; 288 entryHi.vpn2x = entryHiVPN2X; 289 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 290 291 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 292 context.badVPN2 = contextBadVPN2; 293 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 294 setExceptionState(tc, 0x3); 295 296 297 // Set new PC 298 Addr HandlerBase; 299 // Offset 0x180 - General Exception Vector 300 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 301 setHandlerPC(HandlerBase, tc); 302} 303 304void 305AddressErrorFault::invoke(ThreadContext *tc, StaticInstPtr inst) 306{ 307 DPRINTF(MipsPRA, "%s encountered.\n", name()); 308 setExceptionState(tc, 0x4); 309 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 310 311 // Set new PC 312 Addr HandlerBase; 313 // Offset 0x180 - General Exception Vector 314 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 315 setHandlerPC(HandlerBase, tc); 316} 317 318void 319ItbInvalidFault::invoke(ThreadContext *tc, StaticInstPtr inst) 320{ 321 DPRINTF(MipsPRA, "%s encountered.\n", name()); 322 setExceptionState(tc, 0x2); 323 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 324 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 325 entryHi.asid = entryHiAsid; 326 entryHi.vpn2 = entryHiVPN2; 327 entryHi.vpn2x = entryHiVPN2X; 328 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 329 330 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 331 context.badVPN2 = contextBadVPN2; 332 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 333 334 335 // Set new PC 336 Addr HandlerBase; 337 // Offset 0x180 - General Exception Vector 338 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 339 setHandlerPC(HandlerBase,tc); 340 DPRINTF(MipsPRA, "Exception Handler At: %x , EPC set to %x\n", 341 HandlerBase, tc->readMiscReg(MISCREG_EPC)); 342} 343 344void 345ItbRefillFault::invoke(ThreadContext *tc, StaticInstPtr inst) 346{ 347 DPRINTF(MipsPRA, "%s encountered (%x).\n", name(), MISCREG_BADVADDR); 348 Addr HandlerBase; 349 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 350 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 351 entryHi.asid = entryHiAsid; 352 entryHi.vpn2 = entryHiVPN2; 353 entryHi.vpn2x = entryHiVPN2X; 354 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 355 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 356 context.badVPN2 = contextBadVPN2; 357 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 358 359 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 360 // Since handler depends on EXL bit, must check EXL bit before setting it!! 361 // See MIPS ARM Vol 3, Revision 2, Page 38 362 if (status.exl == 1) { 363 // Offset 0x180 - General Exception Vector 364 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 365 } else { 366 // Offset 0x000 367 HandlerBase = tc->readMiscReg(MISCREG_EBASE); 368 } 369 370 setExceptionState(tc, 0x2); 371 setHandlerPC(HandlerBase, tc); 372} 373 374void 375DtbRefillFault::invoke(ThreadContext *tc, StaticInstPtr inst) 376{ 377 // Set new PC 378 DPRINTF(MipsPRA, "%s encountered.\n", name()); 379 Addr HandlerBase; 380 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 381 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 382 entryHi.asid = entryHiAsid; 383 entryHi.vpn2 = entryHiVPN2; 384 entryHi.vpn2x = entryHiVPN2X; 385 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 386 387 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 388 context.badVPN2 = contextBadVPN2; 389 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 390 391 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 392 // Since handler depends on EXL bit, must check EXL bit before setting it!! 393 // See MIPS ARM Vol 3, Revision 2, Page 38 394 if (status.exl) { 395 // Offset 0x180 - General Exception Vector 396 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 397 } else { 398 // Offset 0x000 399 HandlerBase = tc->readMiscReg(MISCREG_EBASE); 400 } 401 402 setExceptionState(tc, 0x3); 403 404 setHandlerPC(HandlerBase, tc); 405} 406 407void 408TLBModifiedFault::invoke(ThreadContext *tc, StaticInstPtr inst) 409{ 410 DPRINTF(MipsPRA, "%s encountered.\n", name()); 411 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 412 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 413 entryHi.asid = entryHiAsid; 414 entryHi.vpn2 = entryHiVPN2; 415 entryHi.vpn2x = entryHiVPN2X; 416 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 417 418 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 419 context.badVPN2 = contextBadVPN2; 420 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 421 422 // Set new PC 423 Addr HandlerBase; 424 // Offset 0x180 - General Exception Vector 425 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 426 setExceptionState(tc, 0x1); 427 setHandlerPC(HandlerBase, tc); 428 429} 430 431void 432SystemCallFault::invoke(ThreadContext *tc, StaticInstPtr inst) 433{ 434 DPRINTF(MipsPRA, "%s encountered.\n", name()); 435 setExceptionState(tc, 0x8); 436 437 // Set new PC 438 Addr HandlerBase; 439 // Offset 0x180 - General Exception Vector 440 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 441 setHandlerPC(HandlerBase, tc); 442} 443 444void 445InterruptFault::invoke(ThreadContext *tc, StaticInstPtr inst) 446{ 447#if FULL_SYSTEM 448 DPRINTF(MipsPRA, "%s encountered.\n", name()); 449 setExceptionState(tc, 0x0A); 450 Addr HandlerBase; 451 452 CauseReg cause = tc->readMiscRegNoEffect(MISCREG_CAUSE); 453 if (cause.iv) { 454 // Offset 200 for release 2 455 HandlerBase = 0x20 + vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 456 } else { 457 //Ofset at 180 for release 1 458 HandlerBase = vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 459 } 460 461 setHandlerPC(HandlerBase, tc); 462#endif 463} 464 465#endif // FULL_SYSTEM 466 467void 468ResetFault::invoke(ThreadContext *tc, StaticInstPtr inst) 469{ 470#if FULL_SYSTEM 471 DPRINTF(MipsPRA, "%s encountered.\n", name()); 472 /* All reset activity must be invoked from here */ 473 tc->setPC(vect()); 474 tc->setNextPC(vect() + sizeof(MachInst)); 475 tc->setNextNPC(vect() + sizeof(MachInst) + sizeof(MachInst)); 476 DPRINTF(MipsPRA, "ResetFault::invoke : PC set to %x", tc->readPC()); 477#endif 478 479 // Set Coprocessor 1 (Floating Point) To Usable 480 StatusReg status = tc->readMiscRegNoEffect(MISCREG_STATUS); 481 status.cu.cu1 = 1; 482 tc->setMiscReg(MISCREG_STATUS, status); 483} 484 485void 486ReservedInstructionFault::invoke(ThreadContext *tc, StaticInstPtr inst) 487{ 488#if FULL_SYSTEM 489 DPRINTF(MipsPRA, "%s encountered.\n", name()); 490 setExceptionState(tc, 0x0A); 491 Addr HandlerBase; 492 // Offset 0x180 - General Exception Vector 493 HandlerBase = vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 494 setHandlerPC(HandlerBase, tc); 495#else 496 panic("%s encountered.\n", name()); 497#endif 498} 499 500void 501ThreadFault::invoke(ThreadContext *tc, StaticInstPtr inst) 502{ 503 DPRINTF(MipsPRA, "%s encountered.\n", name()); 504 panic("%s encountered.\n", name()); 505} 506 507void 508DspStateDisabledFault::invoke(ThreadContext *tc, StaticInstPtr inst) 509{ 510 DPRINTF(MipsPRA, "%s encountered.\n", name()); 511 panic("%s encountered.\n", name()); 512} 513 514void 515CoprocessorUnusableFault::invoke(ThreadContext *tc, StaticInstPtr inst) 516{ 517#if FULL_SYSTEM 518 DPRINTF(MipsPRA, "%s encountered.\n", name()); 519 setExceptionState(tc, 0xb); 520 // The ID of the coprocessor causing the exception is stored in 521 // CoprocessorUnusableFault::coProcID 522 CauseReg cause = tc->readMiscReg(MISCREG_CAUSE); 523 cause.ce = coProcID; 524 tc->setMiscRegNoEffect(MISCREG_CAUSE, cause); 525 526 Addr HandlerBase; 527 // Offset 0x180 - General Exception Vector 528 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 529 setHandlerPC(HandlerBase, tc); 530 531#else 532 warn("%s (CP%d) encountered.\n", name(), coProcID); 533#endif 534} 535 536} // namespace MipsISA 537 538