simple_thread.hh revision 9180:ee8d7a51651d
1/* 2 * Copyright (c) 2011 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 * Copyright (c) 2001-2006 The Regents of The University of Michigan 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions are 19 * met: redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer; 21 * redistributions in binary form must reproduce the above copyright 22 * notice, this list of conditions and the following disclaimer in the 23 * documentation and/or other materials provided with the distribution; 24 * neither the name of the copyright holders nor the names of its 25 * contributors may be used to endorse or promote products derived from 26 * this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 39 * 40 * Authors: Steve Reinhardt 41 * Nathan Binkert 42 */ 43 44#ifndef __CPU_SIMPLE_THREAD_HH__ 45#define __CPU_SIMPLE_THREAD_HH__ 46 47#include "arch/decoder.hh" 48#include "arch/isa.hh" 49#include "arch/isa_traits.hh" 50#include "arch/registers.hh" 51#include "arch/tlb.hh" 52#include "arch/types.hh" 53#include "base/types.hh" 54#include "config/the_isa.hh" 55#include "cpu/thread_context.hh" 56#include "cpu/thread_state.hh" 57#include "debug/FloatRegs.hh" 58#include "debug/IntRegs.hh" 59#include "mem/page_table.hh" 60#include "mem/request.hh" 61#include "sim/byteswap.hh" 62#include "sim/eventq.hh" 63#include "sim/process.hh" 64#include "sim/serialize.hh" 65#include "sim/system.hh" 66 67class BaseCPU; 68class CheckerCPU; 69 70class FunctionProfile; 71class ProfileNode; 72 73namespace TheISA { 74 namespace Kernel { 75 class Statistics; 76 } 77} 78 79/** 80 * The SimpleThread object provides a combination of the ThreadState 81 * object and the ThreadContext interface. It implements the 82 * ThreadContext interface so that a ProxyThreadContext class can be 83 * made using SimpleThread as the template parameter (see 84 * thread_context.hh). It adds to the ThreadState object by adding all 85 * the objects needed for simple functional execution, including a 86 * simple architectural register file, and pointers to the ITB and DTB 87 * in full system mode. For CPU models that do not need more advanced 88 * ways to hold state (i.e. a separate physical register file, or 89 * separate fetch and commit PC's), this SimpleThread class provides 90 * all the necessary state for full architecture-level functional 91 * simulation. See the AtomicSimpleCPU or TimingSimpleCPU for 92 * examples. 93 */ 94 95class SimpleThread : public ThreadState 96{ 97 protected: 98 typedef TheISA::MachInst MachInst; 99 typedef TheISA::MiscReg MiscReg; 100 typedef TheISA::FloatReg FloatReg; 101 typedef TheISA::FloatRegBits FloatRegBits; 102 public: 103 typedef ThreadContext::Status Status; 104 105 protected: 106 union { 107 FloatReg f[TheISA::NumFloatRegs]; 108 FloatRegBits i[TheISA::NumFloatRegs]; 109 } floatRegs; 110 TheISA::IntReg intRegs[TheISA::NumIntRegs]; 111 TheISA::ISA isa; // one "instance" of the current ISA. 112 113 TheISA::PCState _pcState; 114 115 /** Did this instruction execute or is it predicated false */ 116 bool predicate; 117 118 public: 119 std::string name() const 120 { 121 return csprintf("%s.[tid:%i]", baseCpu->name(), tc->threadId()); 122 } 123 124 ProxyThreadContext<SimpleThread> *tc; 125 126 System *system; 127 128 TheISA::TLB *itb; 129 TheISA::TLB *dtb; 130 131 TheISA::Decoder decoder; 132 133 // constructor: initialize SimpleThread from given process structure 134 // FS 135 SimpleThread(BaseCPU *_cpu, int _thread_num, System *_system, 136 TheISA::TLB *_itb, TheISA::TLB *_dtb, 137 bool use_kernel_stats = true); 138 // SE 139 SimpleThread(BaseCPU *_cpu, int _thread_num, System *_system, 140 Process *_process, TheISA::TLB *_itb, TheISA::TLB *_dtb); 141 142 SimpleThread(); 143 144 virtual ~SimpleThread(); 145 146 virtual void takeOverFrom(ThreadContext *oldContext); 147 148 void regStats(const std::string &name); 149 150 void copyTC(ThreadContext *context); 151 152 void copyState(ThreadContext *oldContext); 153 154 void serialize(std::ostream &os); 155 void unserialize(Checkpoint *cp, const std::string §ion); 156 157 /*************************************************************** 158 * SimpleThread functions to provide CPU with access to various 159 * state. 160 **************************************************************/ 161 162 /** Returns the pointer to this SimpleThread's ThreadContext. Used 163 * when a ThreadContext must be passed to objects outside of the 164 * CPU. 165 */ 166 ThreadContext *getTC() { return tc; } 167 168 void demapPage(Addr vaddr, uint64_t asn) 169 { 170 itb->demapPage(vaddr, asn); 171 dtb->demapPage(vaddr, asn); 172 } 173 174 void demapInstPage(Addr vaddr, uint64_t asn) 175 { 176 itb->demapPage(vaddr, asn); 177 } 178 179 void demapDataPage(Addr vaddr, uint64_t asn) 180 { 181 dtb->demapPage(vaddr, asn); 182 } 183 184 void dumpFuncProfile(); 185 186 Fault hwrei(); 187 188 bool simPalCheck(int palFunc); 189 190 /******************************************* 191 * ThreadContext interface functions. 192 ******************************************/ 193 194 BaseCPU *getCpuPtr() { return baseCpu; } 195 196 TheISA::TLB *getITBPtr() { return itb; } 197 198 TheISA::TLB *getDTBPtr() { return dtb; } 199 200 CheckerCPU *getCheckerCpuPtr() { return NULL; } 201 202 TheISA::Decoder *getDecoderPtr() { return &decoder; } 203 204 System *getSystemPtr() { return system; } 205 206 Status status() const { return _status; } 207 208 void setStatus(Status newStatus) { _status = newStatus; } 209 210 /// Set the status to Active. Optional delay indicates number of 211 /// cycles to wait before beginning execution. 212 void activate(Cycles delay = Cycles(1)); 213 214 /// Set the status to Suspended. 215 void suspend(); 216 217 /// Set the status to Halted. 218 void halt(); 219 220 virtual bool misspeculating(); 221 222 void copyArchRegs(ThreadContext *tc); 223 224 void clearArchRegs() 225 { 226 _pcState = 0; 227 memset(intRegs, 0, sizeof(intRegs)); 228 memset(floatRegs.i, 0, sizeof(floatRegs.i)); 229 isa.clear(); 230 } 231 232 // 233 // New accessors for new decoder. 234 // 235 uint64_t readIntReg(int reg_idx) 236 { 237 int flatIndex = isa.flattenIntIndex(reg_idx); 238 assert(flatIndex < TheISA::NumIntRegs); 239 uint64_t regVal = intRegs[flatIndex]; 240 DPRINTF(IntRegs, "Reading int reg %d (%d) as %#x.\n", 241 reg_idx, flatIndex, regVal); 242 return regVal; 243 } 244 245 FloatReg readFloatReg(int reg_idx) 246 { 247 int flatIndex = isa.flattenFloatIndex(reg_idx); 248 assert(flatIndex < TheISA::NumFloatRegs); 249 FloatReg regVal = floatRegs.f[flatIndex]; 250 DPRINTF(FloatRegs, "Reading float reg %d (%d) as %f, %#x.\n", 251 reg_idx, flatIndex, regVal, floatRegs.i[flatIndex]); 252 return regVal; 253 } 254 255 FloatRegBits readFloatRegBits(int reg_idx) 256 { 257 int flatIndex = isa.flattenFloatIndex(reg_idx); 258 assert(flatIndex < TheISA::NumFloatRegs); 259 FloatRegBits regVal = floatRegs.i[flatIndex]; 260 DPRINTF(FloatRegs, "Reading float reg %d (%d) bits as %#x, %f.\n", 261 reg_idx, flatIndex, regVal, floatRegs.f[flatIndex]); 262 return regVal; 263 } 264 265 void setIntReg(int reg_idx, uint64_t val) 266 { 267 int flatIndex = isa.flattenIntIndex(reg_idx); 268 assert(flatIndex < TheISA::NumIntRegs); 269 DPRINTF(IntRegs, "Setting int reg %d (%d) to %#x.\n", 270 reg_idx, flatIndex, val); 271 intRegs[flatIndex] = val; 272 } 273 274 void setFloatReg(int reg_idx, FloatReg val) 275 { 276 int flatIndex = isa.flattenFloatIndex(reg_idx); 277 assert(flatIndex < TheISA::NumFloatRegs); 278 floatRegs.f[flatIndex] = val; 279 DPRINTF(FloatRegs, "Setting float reg %d (%d) to %f, %#x.\n", 280 reg_idx, flatIndex, val, floatRegs.i[flatIndex]); 281 } 282 283 void setFloatRegBits(int reg_idx, FloatRegBits val) 284 { 285 int flatIndex = isa.flattenFloatIndex(reg_idx); 286 assert(flatIndex < TheISA::NumFloatRegs); 287 // XXX: Fix array out of bounds compiler error for gem5.fast 288 // when checkercpu enabled 289 if (flatIndex < TheISA::NumFloatRegs) 290 floatRegs.i[flatIndex] = val; 291 DPRINTF(FloatRegs, "Setting float reg %d (%d) bits to %#x, %#f.\n", 292 reg_idx, flatIndex, val, floatRegs.f[flatIndex]); 293 } 294 295 TheISA::PCState 296 pcState() 297 { 298 return _pcState; 299 } 300 301 void 302 pcState(const TheISA::PCState &val) 303 { 304 _pcState = val; 305 } 306 307 void 308 pcStateNoRecord(const TheISA::PCState &val) 309 { 310 _pcState = val; 311 } 312 313 Addr 314 instAddr() 315 { 316 return _pcState.instAddr(); 317 } 318 319 Addr 320 nextInstAddr() 321 { 322 return _pcState.nextInstAddr(); 323 } 324 325 MicroPC 326 microPC() 327 { 328 return _pcState.microPC(); 329 } 330 331 bool readPredicate() 332 { 333 return predicate; 334 } 335 336 void setPredicate(bool val) 337 { 338 predicate = val; 339 } 340 341 MiscReg 342 readMiscRegNoEffect(int misc_reg, ThreadID tid = 0) 343 { 344 return isa.readMiscRegNoEffect(misc_reg); 345 } 346 347 MiscReg 348 readMiscReg(int misc_reg, ThreadID tid = 0) 349 { 350 return isa.readMiscReg(misc_reg, tc); 351 } 352 353 void 354 setMiscRegNoEffect(int misc_reg, const MiscReg &val, ThreadID tid = 0) 355 { 356 return isa.setMiscRegNoEffect(misc_reg, val); 357 } 358 359 void 360 setMiscReg(int misc_reg, const MiscReg &val, ThreadID tid = 0) 361 { 362 return isa.setMiscReg(misc_reg, val, tc); 363 } 364 365 int 366 flattenIntIndex(int reg) 367 { 368 return isa.flattenIntIndex(reg); 369 } 370 371 int 372 flattenFloatIndex(int reg) 373 { 374 return isa.flattenFloatIndex(reg); 375 } 376 377 unsigned readStCondFailures() { return storeCondFailures; } 378 379 void setStCondFailures(unsigned sc_failures) 380 { storeCondFailures = sc_failures; } 381 382 void syscall(int64_t callnum) 383 { 384 process->syscall(callnum, tc); 385 } 386}; 387 388 389// for non-speculative execution context, spec_mode is always false 390inline bool 391SimpleThread::misspeculating() 392{ 393 return false; 394} 395 396#endif // __CPU_CPU_EXEC_CONTEXT_HH__ 397