19020Sgblack@eecs.umich.edu/* 29020Sgblack@eecs.umich.edu * Copyright (c) 2012 Google 39020Sgblack@eecs.umich.edu * All rights reserved. 49020Sgblack@eecs.umich.edu * 59020Sgblack@eecs.umich.edu * Redistribution and use in source and binary forms, with or without 69020Sgblack@eecs.umich.edu * modification, are permitted provided that the following conditions are 79020Sgblack@eecs.umich.edu * met: redistributions of source code must retain the above copyright 89020Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer; 99020Sgblack@eecs.umich.edu * redistributions in binary form must reproduce the above copyright 109020Sgblack@eecs.umich.edu * notice, this list of conditions and the following disclaimer in the 119020Sgblack@eecs.umich.edu * documentation and/or other materials provided with the distribution; 129020Sgblack@eecs.umich.edu * neither the name of the copyright holders nor the names of its 139020Sgblack@eecs.umich.edu * contributors may be used to endorse or promote products derived from 149020Sgblack@eecs.umich.edu * this software without specific prior written permission. 159020Sgblack@eecs.umich.edu * 169020Sgblack@eecs.umich.edu * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 179020Sgblack@eecs.umich.edu * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 189020Sgblack@eecs.umich.edu * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 199020Sgblack@eecs.umich.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 209020Sgblack@eecs.umich.edu * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 219020Sgblack@eecs.umich.edu * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 229020Sgblack@eecs.umich.edu * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 239020Sgblack@eecs.umich.edu * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 249020Sgblack@eecs.umich.edu * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 259020Sgblack@eecs.umich.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 269020Sgblack@eecs.umich.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 279020Sgblack@eecs.umich.edu * 289020Sgblack@eecs.umich.edu * Authors: Gabe Black 299020Sgblack@eecs.umich.edu */ 309020Sgblack@eecs.umich.edu 319020Sgblack@eecs.umich.edu#ifndef __ARCH_ALPHA_DECODER_HH__ 329020Sgblack@eecs.umich.edu#define __ARCH_ALPHA_DECODER_HH__ 339020Sgblack@eecs.umich.edu 349024Sgblack@eecs.umich.edu#include "arch/generic/decode_cache.hh" 359022Sgblack@eecs.umich.edu#include "arch/types.hh" 369024Sgblack@eecs.umich.edu#include "cpu/static_inst.hh" 379023Sgblack@eecs.umich.edu#include "sim/full_system.hh" 389020Sgblack@eecs.umich.edu 399020Sgblack@eecs.umich.edunamespace AlphaISA 409020Sgblack@eecs.umich.edu{ 419020Sgblack@eecs.umich.edu 4211165SRekai.GonzalezAlberquilla@arm.comclass ISA; 439022Sgblack@eecs.umich.educlass Decoder 449022Sgblack@eecs.umich.edu{ 459022Sgblack@eecs.umich.edu protected: 469023Sgblack@eecs.umich.edu // The extended machine instruction being generated 479023Sgblack@eecs.umich.edu ExtMachInst ext_inst; 489023Sgblack@eecs.umich.edu bool instDone; 499023Sgblack@eecs.umich.edu 509023Sgblack@eecs.umich.edu public: 5111165SRekai.GonzalezAlberquilla@arm.com Decoder(ISA* isa = nullptr) : instDone(false) 529023Sgblack@eecs.umich.edu {} 539023Sgblack@eecs.umich.edu 549023Sgblack@eecs.umich.edu void 559023Sgblack@eecs.umich.edu process() 569023Sgblack@eecs.umich.edu { } 579023Sgblack@eecs.umich.edu 589023Sgblack@eecs.umich.edu void 599023Sgblack@eecs.umich.edu reset() 609023Sgblack@eecs.umich.edu { 619023Sgblack@eecs.umich.edu instDone = false; 629023Sgblack@eecs.umich.edu } 639023Sgblack@eecs.umich.edu 649023Sgblack@eecs.umich.edu // Use this to give data to the predecoder. This should be used 659023Sgblack@eecs.umich.edu // when there is control flow. 669023Sgblack@eecs.umich.edu void 679023Sgblack@eecs.umich.edu moreBytes(const PCState &pc, Addr fetchPC, MachInst inst) 689023Sgblack@eecs.umich.edu { 699023Sgblack@eecs.umich.edu ext_inst = inst; 709023Sgblack@eecs.umich.edu instDone = true; 719023Sgblack@eecs.umich.edu if (FullSystem) 729023Sgblack@eecs.umich.edu ext_inst |= (static_cast<ExtMachInst>(pc.pc() & 0x1) << 32); 739023Sgblack@eecs.umich.edu } 749023Sgblack@eecs.umich.edu 759023Sgblack@eecs.umich.edu bool 769023Sgblack@eecs.umich.edu needMoreBytes() 779023Sgblack@eecs.umich.edu { 789023Sgblack@eecs.umich.edu return true; 799023Sgblack@eecs.umich.edu } 809023Sgblack@eecs.umich.edu 819023Sgblack@eecs.umich.edu bool 829023Sgblack@eecs.umich.edu instReady() 839023Sgblack@eecs.umich.edu { 849023Sgblack@eecs.umich.edu return instDone; 859023Sgblack@eecs.umich.edu } 869023Sgblack@eecs.umich.edu 879478Snilay@cs.wisc.edu void takeOverFrom(Decoder * old) {} 889478Snilay@cs.wisc.edu 899023Sgblack@eecs.umich.edu protected: 909022Sgblack@eecs.umich.edu /// A cache of decoded instruction objects. 919024Sgblack@eecs.umich.edu static GenericISA::BasicDecodeCache defaultCache; 929022Sgblack@eecs.umich.edu 939022Sgblack@eecs.umich.edu public: 949022Sgblack@eecs.umich.edu StaticInstPtr decodeInst(ExtMachInst mach_inst); 959022Sgblack@eecs.umich.edu 969022Sgblack@eecs.umich.edu /// Decode a machine instruction. 979022Sgblack@eecs.umich.edu /// @param mach_inst The binary instruction to decode. 989022Sgblack@eecs.umich.edu /// @retval A pointer to the corresponding StaticInst object. 999022Sgblack@eecs.umich.edu StaticInstPtr 1009022Sgblack@eecs.umich.edu decode(ExtMachInst mach_inst, Addr addr) 1019022Sgblack@eecs.umich.edu { 1029022Sgblack@eecs.umich.edu return defaultCache.decode(this, mach_inst, addr); 1039022Sgblack@eecs.umich.edu } 1049023Sgblack@eecs.umich.edu 1059023Sgblack@eecs.umich.edu StaticInstPtr 1069023Sgblack@eecs.umich.edu decode(AlphaISA::PCState &nextPC) 1079023Sgblack@eecs.umich.edu { 1089023Sgblack@eecs.umich.edu if (!instDone) 1099023Sgblack@eecs.umich.edu return NULL; 1109023Sgblack@eecs.umich.edu instDone = false; 1119023Sgblack@eecs.umich.edu return decode(ext_inst, nextPC.instAddr()); 1129023Sgblack@eecs.umich.edu } 1139022Sgblack@eecs.umich.edu}; 1149020Sgblack@eecs.umich.edu 1159020Sgblack@eecs.umich.edu} // namespace AlphaISA 1169020Sgblack@eecs.umich.edu 1179020Sgblack@eecs.umich.edu#endif // __ARCH_ALPHA_DECODER_HH__ 118