dyn_inst.hh revision 8229:78bf55f23338
1/* 2 * Copyright (c) 2010 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) 2004-2006 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: Kevin Lim 41 */ 42 43#ifndef __CPU_O3_DYN_INST_HH__ 44#define __CPU_O3_DYN_INST_HH__ 45 46#include "arch/isa_traits.hh" 47#include "config/the_isa.hh" 48#include "cpu/o3/cpu.hh" 49#include "cpu/o3/isa_specific.hh" 50#include "cpu/base_dyn_inst.hh" 51#include "cpu/inst_seq.hh" 52 53class Packet; 54 55/** 56 * Mostly implementation & ISA specific AlphaDynInst. As with most 57 * other classes in the new CPU model, it is templated on the Impl to 58 * allow for passing in of all types, such as the CPU type and the ISA 59 * type. The AlphaDynInst serves as the primary interface to the CPU 60 * for instructions that are executing. 61 */ 62template <class Impl> 63class BaseO3DynInst : public BaseDynInst<Impl> 64{ 65 public: 66 /** Typedef for the CPU. */ 67 typedef typename Impl::O3CPU O3CPU; 68 69 /** Binary machine instruction type. */ 70 typedef TheISA::MachInst MachInst; 71 /** Extended machine instruction type. */ 72 typedef TheISA::ExtMachInst ExtMachInst; 73 /** Logical register index type. */ 74 typedef TheISA::RegIndex RegIndex; 75 /** Integer register index type. */ 76 typedef TheISA::IntReg IntReg; 77 typedef TheISA::FloatReg FloatReg; 78 typedef TheISA::FloatRegBits FloatRegBits; 79 /** Misc register index type. */ 80 typedef TheISA::MiscReg MiscReg; 81 82 enum { 83 MaxInstSrcRegs = TheISA::MaxInstSrcRegs, //< Max source regs 84 MaxInstDestRegs = TheISA::MaxInstDestRegs, //< Max dest regs 85 }; 86 87 public: 88 /** BaseDynInst constructor given a binary instruction. */ 89 BaseO3DynInst(StaticInstPtr staticInst, 90 TheISA::PCState pc, TheISA::PCState predPC, 91 InstSeqNum seq_num, O3CPU *cpu); 92 93 /** BaseDynInst constructor given a binary instruction. */ 94 BaseO3DynInst(ExtMachInst inst, 95 TheISA::PCState pc, TheISA::PCState predPC, 96 InstSeqNum seq_num, O3CPU *cpu); 97 98 /** BaseDynInst constructor given a static inst pointer. */ 99 BaseO3DynInst(StaticInstPtr &_staticInst); 100 101 /** Executes the instruction.*/ 102 Fault execute(); 103 104 /** Initiates the access. Only valid for memory operations. */ 105 Fault initiateAcc(); 106 107 /** Completes the access. Only valid for memory operations. */ 108 Fault completeAcc(PacketPtr pkt); 109 110 private: 111 /** Initializes variables. */ 112 void initVars(); 113 114 protected: 115 /** Indexes of the destination misc. registers. They are needed to defer 116 * the write accesses to the misc. registers until the commit stage, when 117 * the instruction is out of its speculative state. 118 */ 119 int _destMiscRegIdx[MaxInstDestRegs]; 120 /** Values to be written to the destination misc. registers. */ 121 MiscReg _destMiscRegVal[MaxInstDestRegs]; 122 /** Number of destination misc. registers. */ 123 int _numDestMiscRegs; 124 125 public: 126 /** Reads a misc. register, including any side-effects the read 127 * might have as defined by the architecture. 128 */ 129 MiscReg readMiscReg(int misc_reg) 130 { 131 return this->cpu->readMiscReg(misc_reg, this->threadNumber); 132 } 133 134 /** Sets a misc. register, including any side-effects the write 135 * might have as defined by the architecture. 136 */ 137 void setMiscReg(int misc_reg, const MiscReg &val) 138 { 139 /** Writes to misc. registers are recorded and deferred until the 140 * commit stage, when updateMiscRegs() is called. 141 */ 142 _destMiscRegIdx[_numDestMiscRegs] = misc_reg; 143 _destMiscRegVal[_numDestMiscRegs] = val; 144 _numDestMiscRegs++; 145 } 146 147 /** Reads a misc. register, including any side-effects the read 148 * might have as defined by the architecture. 149 */ 150 TheISA::MiscReg readMiscRegOperand(const StaticInst *si, int idx) 151 { 152 return this->cpu->readMiscReg( 153 si->srcRegIdx(idx) - TheISA::Ctrl_Base_DepTag, 154 this->threadNumber); 155 } 156 157 /** Sets a misc. register, including any side-effects the write 158 * might have as defined by the architecture. 159 */ 160 void setMiscRegOperand(const StaticInst *si, int idx, 161 const MiscReg &val) 162 { 163 int misc_reg = si->destRegIdx(idx) - TheISA::Ctrl_Base_DepTag; 164 setMiscReg(misc_reg, val); 165 } 166 167 /** Called at the commit stage to update the misc. registers. */ 168 void updateMiscRegs() 169 { 170 // @todo: Pretty convoluted way to avoid squashing from happening when 171 // using the TC during an instruction's execution (specifically for 172 // instructions that have side-effects that use the TC). Fix this. 173 // See cpu/o3/dyn_inst_impl.hh. 174 bool in_syscall = this->thread->inSyscall; 175 this->thread->inSyscall = true; 176 177 for (int i = 0; i < _numDestMiscRegs; i++) 178 this->cpu->setMiscReg( 179 _destMiscRegIdx[i], _destMiscRegVal[i], this->threadNumber); 180 181 this->thread->inSyscall = in_syscall; 182 } 183 184 void forwardOldRegs() 185 { 186 187 for (int idx = 0; idx < this->numDestRegs(); idx++) { 188 PhysRegIndex prev_phys_reg = this->prevDestRegIdx(idx); 189 TheISA::RegIndex original_dest_reg = this->staticInst->destRegIdx(idx); 190 if (original_dest_reg < TheISA::FP_Base_DepTag) 191 this->setIntRegOperand(this->staticInst.get(), idx, this->cpu->readIntReg(prev_phys_reg)); 192 else if (original_dest_reg < TheISA::Ctrl_Base_DepTag) 193 this->setFloatRegOperandBits(this->staticInst.get(), idx, this->cpu->readFloatRegBits(prev_phys_reg)); 194 } 195 } 196#if FULL_SYSTEM 197 /** Calls hardware return from error interrupt. */ 198 Fault hwrei(); 199 /** Traps to handle specified fault. */ 200 void trap(Fault fault); 201 bool simPalCheck(int palFunc); 202#else 203 /** Calls a syscall. */ 204 void syscall(int64_t callnum); 205#endif 206 207 public: 208 209 // The register accessor methods provide the index of the 210 // instruction's operand (e.g., 0 or 1), not the architectural 211 // register index, to simplify the implementation of register 212 // renaming. We find the architectural register index by indexing 213 // into the instruction's own operand index table. Note that a 214 // raw pointer to the StaticInst is provided instead of a 215 // ref-counted StaticInstPtr to redice overhead. This is fine as 216 // long as these methods don't copy the pointer into any long-term 217 // storage (which is pretty hard to imagine they would have reason 218 // to do). 219 220 uint64_t readIntRegOperand(const StaticInst *si, int idx) 221 { 222 return this->cpu->readIntReg(this->_srcRegIdx[idx]); 223 } 224 225 FloatReg readFloatRegOperand(const StaticInst *si, int idx) 226 { 227 return this->cpu->readFloatReg(this->_srcRegIdx[idx]); 228 } 229 230 FloatRegBits readFloatRegOperandBits(const StaticInst *si, int idx) 231 { 232 return this->cpu->readFloatRegBits(this->_srcRegIdx[idx]); 233 } 234 235 /** @todo: Make results into arrays so they can handle multiple dest 236 * registers. 237 */ 238 void setIntRegOperand(const StaticInst *si, int idx, uint64_t val) 239 { 240 this->cpu->setIntReg(this->_destRegIdx[idx], val); 241 BaseDynInst<Impl>::setIntRegOperand(si, idx, val); 242 } 243 244 void setFloatRegOperand(const StaticInst *si, int idx, FloatReg val) 245 { 246 this->cpu->setFloatReg(this->_destRegIdx[idx], val); 247 BaseDynInst<Impl>::setFloatRegOperand(si, idx, val); 248 } 249 250 void setFloatRegOperandBits(const StaticInst *si, int idx, 251 FloatRegBits val) 252 { 253 this->cpu->setFloatRegBits(this->_destRegIdx[idx], val); 254 BaseDynInst<Impl>::setFloatRegOperandBits(si, idx, val); 255 } 256 257#if THE_ISA == MIPS_ISA 258 uint64_t readRegOtherThread(int misc_reg) 259 { 260 panic("MIPS MT not defined for O3 CPU.\n"); 261 return 0; 262 } 263 264 void setRegOtherThread(int misc_reg, const TheISA::MiscReg &val) 265 { 266 panic("MIPS MT not defined for O3 CPU.\n"); 267 } 268#endif 269 270 public: 271 /** Calculates EA part of a memory instruction. Currently unused, 272 * though it may be useful in the future if we want to split 273 * memory operations into EA calculation and memory access parts. 274 */ 275 Fault calcEA() 276 { 277 return this->staticInst->eaCompInst()->execute(this, this->traceData); 278 } 279 280 /** Does the memory access part of a memory instruction. Currently unused, 281 * though it may be useful in the future if we want to split 282 * memory operations into EA calculation and memory access parts. 283 */ 284 Fault memAccess() 285 { 286 return this->staticInst->memAccInst()->execute(this, this->traceData); 287 } 288}; 289 290#endif // __CPU_O3_ALPHA_DYN_INST_HH__ 291 292