faults.cc revision 8575
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 187AddressErrorFault::invoke(ThreadContext *tc, StaticInstPtr inst) 188{ 189 DPRINTF(MipsPRA, "%s encountered.\n", name()); 190 setExceptionState(tc, store ? 0x5 : 0x4); 191 tc->setMiscRegNoEffect(MISCREG_BADVADDR, vaddr); 192 193 // Set new PC 194 Addr HandlerBase; 195 // Offset 0x180 - General Exception Vector 196 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 197 setHandlerPC(HandlerBase, tc); 198} 199 200void 201TlbInvalidFault::invoke(ThreadContext *tc, StaticInstPtr inst) 202{ 203 setTlbExceptionState(tc, store ? 0x3 : 0x2); 204 // Set new PC 205 Addr HandlerBase; 206 // Offset 0x180 - General Exception Vector 207 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 208 setHandlerPC(HandlerBase, tc); 209} 210 211void 212TlbRefillFault::invoke(ThreadContext *tc, StaticInstPtr inst) 213{ 214 // Since handler depends on EXL bit, must check EXL bit before setting it!! 215 StatusReg status = tc->readMiscReg(MISCREG_STATUS); 216 217 setTlbExceptionState(tc, store ? 0x3 : 0x2); 218 219 // See MIPS ARM Vol 3, Revision 2, Page 38 220 if (status.exl == 1) { 221 // Offset 0x180 - General Exception Vector 222 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 223 } else { 224 // Offset 0x000 225 HandlerBase = tc->readMiscReg(MISCREG_EBASE); 226 } 227 setHandlerPC(HandlerBase, tc); 228} 229 230void 231TlbModifiedFault::invoke(ThreadContext *tc, StaticInstPtr inst) 232{ 233 setTlbExceptionState(tc, 0x1); 234 235 // Set new PC 236 Addr HandlerBase; 237 // Offset 0x180 - General Exception Vector 238 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 239 setHandlerPC(HandlerBase, tc); 240} 241 242void 243SystemCallFault::invoke(ThreadContext *tc, StaticInstPtr inst) 244{ 245 DPRINTF(MipsPRA, "%s encountered.\n", name()); 246 setExceptionState(tc, 0x8); 247 248 // Set new PC 249 Addr HandlerBase; 250 // Offset 0x180 - General Exception Vector 251 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 252 setHandlerPC(HandlerBase, tc); 253} 254 255void 256InterruptFault::invoke(ThreadContext *tc, StaticInstPtr inst) 257{ 258#if FULL_SYSTEM 259 DPRINTF(MipsPRA, "%s encountered.\n", name()); 260 setExceptionState(tc, 0x0A); 261 Addr HandlerBase; 262 263 CauseReg cause = tc->readMiscRegNoEffect(MISCREG_CAUSE); 264 if (cause.iv) { 265 // Offset 200 for release 2 266 HandlerBase = 0x20 + vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 267 } else { 268 //Ofset at 180 for release 1 269 HandlerBase = vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 270 } 271 272 setHandlerPC(HandlerBase, tc); 273#endif 274} 275 276#endif // FULL_SYSTEM 277 278void 279ResetFault::invoke(ThreadContext *tc, StaticInstPtr inst) 280{ 281#if FULL_SYSTEM 282 DPRINTF(MipsPRA, "%s encountered.\n", name()); 283 /* All reset activity must be invoked from here */ 284 tc->setPC(vect()); 285 tc->setNextPC(vect() + sizeof(MachInst)); 286 tc->setNextNPC(vect() + sizeof(MachInst) + sizeof(MachInst)); 287 DPRINTF(MipsPRA, "ResetFault::invoke : PC set to %x", tc->readPC()); 288#endif 289 290 // Set Coprocessor 1 (Floating Point) To Usable 291 StatusReg status = tc->readMiscRegNoEffect(MISCREG_STATUS); 292 status.cu.cu1 = 1; 293 tc->setMiscReg(MISCREG_STATUS, status); 294} 295 296void 297ReservedInstructionFault::invoke(ThreadContext *tc, StaticInstPtr inst) 298{ 299#if FULL_SYSTEM 300 DPRINTF(MipsPRA, "%s encountered.\n", name()); 301 setExceptionState(tc, 0x0A); 302 Addr HandlerBase; 303 // Offset 0x180 - General Exception Vector 304 HandlerBase = vect() + tc->readMiscRegNoEffect(MISCREG_EBASE); 305 setHandlerPC(HandlerBase, tc); 306#else 307 panic("%s encountered.\n", name()); 308#endif 309} 310 311void 312ThreadFault::invoke(ThreadContext *tc, StaticInstPtr inst) 313{ 314 DPRINTF(MipsPRA, "%s encountered.\n", name()); 315 panic("%s encountered.\n", name()); 316} 317 318void 319DspStateDisabledFault::invoke(ThreadContext *tc, StaticInstPtr inst) 320{ 321 DPRINTF(MipsPRA, "%s encountered.\n", name()); 322 panic("%s encountered.\n", name()); 323} 324 325void 326CoprocessorUnusableFault::invoke(ThreadContext *tc, StaticInstPtr inst) 327{ 328#if FULL_SYSTEM 329 DPRINTF(MipsPRA, "%s encountered.\n", name()); 330 setExceptionState(tc, 0xb); 331 // The ID of the coprocessor causing the exception is stored in 332 // CoprocessorUnusableFault::coProcID 333 CauseReg cause = tc->readMiscReg(MISCREG_CAUSE); 334 cause.ce = coProcID; 335 tc->setMiscRegNoEffect(MISCREG_CAUSE, cause); 336 337 Addr HandlerBase; 338 // Offset 0x180 - General Exception Vector 339 HandlerBase = vect() + tc->readMiscReg(MISCREG_EBASE); 340 setHandlerPC(HandlerBase, tc); 341 342#else 343 warn("%s (CP%d) encountered.\n", name(), coProcID); 344#endif 345} 346 347} // namespace MipsISA 348 349