faults.cc revision 8574:16a168a366d8
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 49typedef MipsFaultBase::FaultVals FaultVals; 50 51template <> FaultVals MipsFault<MachineCheckFault>::vals = 52 { "Machine Check", 0x0401 }; 53 54template <> FaultVals MipsFault<ResetFault>::vals = 55#if FULL_SYSTEM 56 { "Reset Fault", 0xBFC00000}; 57#else 58 { "Reset Fault", 0x001}; 59#endif 60 61template <> FaultVals MipsFault<AddressErrorFault>::vals = 62 { "Address Error", 0x0180 }; 63 64template <> FaultVals MipsFault<SystemCallFault>::vals = 65 { "Syscall", 0x0180 }; 66 67template <> FaultVals MipsFault<CoprocessorUnusableFault>::vals = 68 { "Coprocessor Unusable Fault", 0x180 }; 69 70template <> FaultVals MipsFault<ReservedInstructionFault>::vals = 71 { "Reserved Instruction Fault", 0x0180 }; 72 73template <> FaultVals MipsFault<ThreadFault>::vals = 74 { "Thread Fault", 0x00F1 }; 75 76template <> FaultVals MipsFault<IntegerOverflowFault>::vals = 77 { "Integer Overflow Exception", 0x180 }; 78 79template <> FaultVals MipsFault<InterruptFault>::vals = 80 { "interrupt", 0x0180 }; 81 82template <> FaultVals MipsFault<TrapFault>::vals = 83 { "Trap", 0x0180 }; 84 85template <> FaultVals MipsFault<BreakpointFault>::vals = 86 { "Breakpoint", 0x0180 }; 87 88template <> FaultVals MipsFault<TlbInvalidFault>::vals = 89 { "Invalid TLB Entry Exception", 0x0180 }; 90 91template <> FaultVals MipsFault<TlbRefillFault>::vals = 92 { "TLB Refill Exception", 0x0180 }; 93 94template <> FaultVals MipsFault<TLBModifiedFault>::vals = 95 { "TLB Modified Exception", 0x0180 }; 96 97template <> FaultVals MipsFault<DspStateDisabledFault>::vals = 98 { "DSP Disabled Fault", 0x001a }; 99 100void 101MipsFaultBase::setExceptionState(ThreadContext *tc, uint8_t excCode) 102{ 103 // modify SRS Ctl - Save CSS, put ESS into CSS 104 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 105 if (status.exl != 1 && status.bev != 1) { 106 // SRS Ctl is modified only if Status_EXL and Status_BEV are not set 107 SRSCtlReg srsCtl = tc->readMiscReg(MISCREG_SRSCTL); 108 srsCtl.pss = srsCtl.css; 109 srsCtl.css = srsCtl.ess; 110 tc->setMiscRegNoEffect(MISCREG_SRSCTL, srsCtl); 111 } 112 113 // set EXL bit (don't care if it is already set!) 114 status.exl = 1; 115 tc->setMiscRegNoEffect(MISCREG_STATUS, status); 116 117 // write EPC 118 PCState pc = tc->pcState(); 119 DPRINTF(MipsPRA, "PC: %s\n", pc); 120 bool delay_slot = pc.pc() + sizeof(MachInst) != pc.npc(); 121 tc->setMiscRegNoEffect(MISCREG_EPC, 122 pc.pc() - delay_slot ? sizeof(MachInst) : 0); 123 124 // Set Cause_EXCCODE field 125 CauseReg cause = tc->readMiscReg(MISCREG_CAUSE); 126 cause.excCode = excCode; 127 cause.bd = delay_slot ? 1 : 0; 128 cause.ce = 0; 129 tc->setMiscRegNoEffect(MISCREG_CAUSE, cause); 130} 131 132#if FULL_SYSTEM 133void 134MipsFaultBase::setHandlerPC(Addr HandlerBase, ThreadContext *tc) 135{ 136 tc->setPC(HandlerBase); 137 tc->setNextPC(HandlerBase + sizeof(MachInst)); 138 tc->setNextNPC(HandlerBase + 2 * sizeof(MachInst)); 139} 140 141void 142IntegerOverflowFault::invoke(ThreadContext *tc, StaticInstPtr inst) 143{ 144 DPRINTF(MipsPRA, "%s encountered.\n", name()); 145 setExceptionState(tc, 0xC); 146 147 // Set new PC 148 Addr HandlerBase; 149 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 150 // Here, the handler is dependent on BEV, which is not modified by 151 // setExceptionState() 152 if (!status.bev) { 153 // See MIPS ARM Vol 3, Revision 2, Page 38 154 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 155 } else { 156 HandlerBase = 0xBFC00200; 157 } 158 setHandlerPC(HandlerBase, tc); 159} 160 161void 162TrapFault::invoke(ThreadContext *tc, StaticInstPtr inst) 163{ 164 DPRINTF(MipsPRA, "%s encountered.\n", name()); 165 setExceptionState(tc, 0xD); 166 167 // Set new PC 168 Addr HandlerBase; 169 // Offset 0x180 - General Exception Vector 170 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 171 setHandlerPC(HandlerBase, tc); 172} 173 174void 175BreakpointFault::invoke(ThreadContext *tc, StaticInstPtr inst) 176{ 177 setExceptionState(tc, 0x9); 178 179 // Set new PC 180 Addr HandlerBase; 181 // Offset 0x180 - General Exception Vector 182 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 183 setHandlerPC(HandlerBase, tc); 184} 185 186void 187TlbInvalidFault::invoke(ThreadContext *tc, StaticInstPtr inst) 188{ 189 DPRINTF(MipsPRA, "%s encountered.\n", name()); 190 setExceptionState(tc, store ? 0x3 : 0x2); 191 192 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 193 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 194 entryHi.asid = entryHiAsid; 195 entryHi.vpn2 = entryHiVPN2; 196 entryHi.vpn2x = entryHiVPN2X; 197 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 198 199 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 200 context.badVPN2 = contextBadVPN2; 201 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 202 203 // Set new PC 204 Addr HandlerBase; 205 // Offset 0x180 - General Exception Vector 206 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 207 setHandlerPC(HandlerBase, tc); 208} 209 210void 211AddressErrorFault::invoke(ThreadContext *tc, StaticInstPtr inst) 212{ 213 DPRINTF(MipsPRA, "%s encountered.\n", name()); 214 setExceptionState(tc, store ? 0x5 : 0x4); 215 tc->setMiscRegNoEffect(MISCREG_BADVADDR, vaddr); 216 217 // Set new PC 218 Addr HandlerBase; 219 // Offset 0x180 - General Exception Vector 220 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 221 setHandlerPC(HandlerBase, tc); 222} 223 224void 225TlbRefillFault::invoke(ThreadContext *tc, StaticInstPtr inst) 226{ 227 DPRINTF(MipsPRA, "%s encountered (%x).\n", name(), MISCREG_BADVADDR); 228 setExceptionState(tc, store ? 0x3 : 0x2); 229 230 Addr HandlerBase; 231 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 232 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 233 entryHi.asid = entryHiAsid; 234 entryHi.vpn2 = entryHiVPN2; 235 entryHi.vpn2x = entryHiVPN2X; 236 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 237 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 238 context.badVPN2 = contextBadVPN2; 239 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 240 241 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 242 // Since handler depends on EXL bit, must check EXL bit before setting it!! 243 // See MIPS ARM Vol 3, Revision 2, Page 38 244 if (status.exl == 1) { 245 // Offset 0x180 - General Exception Vector 246 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 247 } else { 248 // Offset 0x000 249 HandlerBase = tc->readMiscReg(MISCREG_EBASE); 250 } 251 setHandlerPC(HandlerBase, tc); 252} 253 254void 255TLBModifiedFault::invoke(ThreadContext *tc, StaticInstPtr inst) 256{ 257 DPRINTF(MipsPRA, "%s encountered.\n", name()); 258 tc->setMiscRegNoEffect(MISCREG_BADVADDR, badVAddr); 259 EntryHiReg entryHi = tc->readMiscReg(MISCREG_ENTRYHI); 260 entryHi.asid = entryHiAsid; 261 entryHi.vpn2 = entryHiVPN2; 262 entryHi.vpn2x = entryHiVPN2X; 263 tc->setMiscRegNoEffect(MISCREG_ENTRYHI, entryHi); 264 265 ContextReg context = tc->readMiscReg(MISCREG_CONTEXT); 266 context.badVPN2 = contextBadVPN2; 267 tc->setMiscRegNoEffect(MISCREG_CONTEXT, context); 268 269 // Set new PC 270 Addr HandlerBase; 271 // Offset 0x180 - General Exception Vector 272 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 273 setExceptionState(tc, 0x1); 274 setHandlerPC(HandlerBase, tc); 275 276} 277 278void 279SystemCallFault::invoke(ThreadContext *tc, StaticInstPtr inst) 280{ 281 DPRINTF(MipsPRA, "%s encountered.\n", name()); 282 setExceptionState(tc, 0x8); 283 284 // Set new PC 285 Addr HandlerBase; 286 // Offset 0x180 - General Exception Vector 287 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 288 setHandlerPC(HandlerBase, tc); 289} 290 291void 292InterruptFault::invoke(ThreadContext *tc, StaticInstPtr inst) 293{ 294#if FULL_SYSTEM 295 DPRINTF(MipsPRA, "%s encountered.\n", name()); 296 setExceptionState(tc, 0x0A); 297 Addr HandlerBase; 298 299 CauseReg cause = tc->readMiscRegNoEffect(MISCREG_CAUSE); 300 if (cause.iv) { 301 // Offset 200 for release 2 302 HandlerBase = 0x20 + vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 303 } else { 304 //Ofset at 180 for release 1 305 HandlerBase = vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 306 } 307 308 setHandlerPC(HandlerBase, tc); 309#endif 310} 311 312#endif // FULL_SYSTEM 313 314void 315ResetFault::invoke(ThreadContext *tc, StaticInstPtr inst) 316{ 317#if FULL_SYSTEM 318 DPRINTF(MipsPRA, "%s encountered.\n", name()); 319 /* All reset activity must be invoked from here */ 320 tc->setPC(vect()); 321 tc->setNextPC(vect() + sizeof(MachInst)); 322 tc->setNextNPC(vect() + sizeof(MachInst) + sizeof(MachInst)); 323 DPRINTF(MipsPRA, "ResetFault::invoke : PC set to %x", tc->readPC()); 324#endif 325 326 // Set Coprocessor 1 (Floating Point) To Usable 327 StatusReg status = tc->readMiscRegNoEffect(MISCREG_STATUS); 328 status.cu.cu1 = 1; 329 tc->setMiscReg(MISCREG_STATUS, status); 330} 331 332void 333ReservedInstructionFault::invoke(ThreadContext *tc, StaticInstPtr inst) 334{ 335#if FULL_SYSTEM 336 DPRINTF(MipsPRA, "%s encountered.\n", name()); 337 setExceptionState(tc, 0x0A); 338 Addr HandlerBase; 339 // Offset 0x180 - General Exception Vector 340 HandlerBase = vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 341 setHandlerPC(HandlerBase, tc); 342#else 343 panic("%s encountered.\n", name()); 344#endif 345} 346 347void 348ThreadFault::invoke(ThreadContext *tc, StaticInstPtr inst) 349{ 350 DPRINTF(MipsPRA, "%s encountered.\n", name()); 351 panic("%s encountered.\n", name()); 352} 353 354void 355DspStateDisabledFault::invoke(ThreadContext *tc, StaticInstPtr inst) 356{ 357 DPRINTF(MipsPRA, "%s encountered.\n", name()); 358 panic("%s encountered.\n", name()); 359} 360 361void 362CoprocessorUnusableFault::invoke(ThreadContext *tc, StaticInstPtr inst) 363{ 364#if FULL_SYSTEM 365 DPRINTF(MipsPRA, "%s encountered.\n", name()); 366 setExceptionState(tc, 0xb); 367 // The ID of the coprocessor causing the exception is stored in 368 // CoprocessorUnusableFault::coProcID 369 CauseReg cause = tc->readMiscReg(MISCREG_CAUSE); 370 cause.ce = coProcID; 371 tc->setMiscRegNoEffect(MISCREG_CAUSE, cause); 372 373 Addr HandlerBase; 374 // Offset 0x180 - General Exception Vector 375 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 376 setHandlerPC(HandlerBase, tc); 377 378#else 379 warn("%s (CP%d) encountered.\n", name(), coProcID); 380#endif 381} 382 383} // namespace MipsISA 384 385