decoder.hh (11723:0596db108c53) | decoder.hh (12120:133620bfc43b) |
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1/* 2 * Copyright (c) 2012 Google | 1/* 2 * Copyright (c) 2012 Google |
3 * Copyright (c) 2017 The University of Virginia |
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3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the --- 10 unchanged lines hidden (view full) --- 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Gabe Black | 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 --- 10 unchanged lines hidden (view full) --- 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 * Alec Roelke |
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29 */ 30 31#ifndef __ARCH_RISCV_DECODER_HH__ 32#define __ARCH_RISCV_DECODER_HH__ 33 34#include "arch/generic/decode_cache.hh" | 31 */ 32 33#ifndef __ARCH_RISCV_DECODER_HH__ 34#define __ARCH_RISCV_DECODER_HH__ 35 36#include "arch/generic/decode_cache.hh" |
37#include "arch/riscv/isa_traits.hh" |
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35#include "arch/riscv/types.hh" 36#include "base/misc.hh" 37#include "base/types.hh" 38#include "cpu/static_inst.hh" | 38#include "arch/riscv/types.hh" 39#include "base/misc.hh" 40#include "base/types.hh" 41#include "cpu/static_inst.hh" |
42#include "debug/Decode.hh" |
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39 40namespace RiscvISA 41{ 42 43class ISA; 44class Decoder 45{ | 43 44namespace RiscvISA 45{ 46 47class ISA; 48class Decoder 49{ |
50 private: 51 DecodeCache::InstMap instMap; 52 bool mid; 53 |
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46 protected: 47 //The extended machine instruction being generated 48 ExtMachInst emi; 49 bool instDone; 50 51 public: | 54 protected: 55 //The extended machine instruction being generated 56 ExtMachInst emi; 57 bool instDone; 58 59 public: |
52 Decoder(ISA* isa = nullptr) : instDone(false) | 60 Decoder(ISA* isa=nullptr) 61 : mid(false), emi(NoopMachInst), instDone(false) |
53 {} 54 | 62 {} 63 |
55 void 56 process() 57 { 58 } | 64 void process() {} 65 void reset() { instDone = false; } |
59 | 66 |
60 void 61 reset() 62 { 63 instDone = false; 64 } 65 | |
66 //Use this to give data to the decoder. This should be used 67 //when there is control flow. | 67 //Use this to give data to the decoder. This should be used 68 //when there is control flow. |
68 void 69 moreBytes(const PCState &pc, Addr fetchPC, MachInst inst) 70 { 71 emi = inst; 72 instDone = true; 73 } | 69 void moreBytes(const PCState &pc, Addr fetchPC, MachInst inst); |
74 | 70 |
75 bool 76 needMoreBytes() 77 { 78 return true; 79 } 80 81 bool 82 instReady() 83 { 84 return instDone; 85 } 86 | 71 bool needMoreBytes() { return true; } 72 bool instReady() { return instDone; } |
87 void takeOverFrom(Decoder *old) {} 88 | 73 void takeOverFrom(Decoder *old) {} 74 |
89 protected: 90 /// A cache of decoded instruction objects. 91 static GenericISA::BasicDecodeCache defaultCache; 92 93 public: | |
94 StaticInstPtr decodeInst(ExtMachInst mach_inst); 95 96 /// Decode a machine instruction. 97 /// @param mach_inst The binary instruction to decode. 98 /// @retval A pointer to the corresponding StaticInst object. | 75 StaticInstPtr decodeInst(ExtMachInst mach_inst); 76 77 /// Decode a machine instruction. 78 /// @param mach_inst The binary instruction to decode. 79 /// @retval A pointer to the corresponding StaticInst object. |
99 StaticInstPtr 100 decode(ExtMachInst mach_inst, Addr addr) 101 { 102 return defaultCache.decode(this, mach_inst, addr); 103 } | 80 StaticInstPtr decode(ExtMachInst mach_inst, Addr addr); |
104 | 81 |
105 StaticInstPtr 106 decode(RiscvISA::PCState &nextPC) 107 { 108 if (!instDone) 109 return nullptr; 110 instDone = false; 111 return decode(emi, nextPC.instAddr()); 112 } | 82 StaticInstPtr decode(RiscvISA::PCState &nextPC); |
113}; 114 115} // namespace RiscvISA 116 117#endif // __ARCH_RISCV_DECODER_HH__ | 83}; 84 85} // namespace RiscvISA 86 87#endif // __ARCH_RISCV_DECODER_HH__ |