1/* 2 * Copyright (c) 2012 Google 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 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 29 */ 30 31#ifndef __ARCH_MIPS_DECODER_HH__ 32#define __ARCH_MIPS_DECODER_HH__ 33 34#include "arch/generic/decode_cache.hh" 35#include "arch/mips/types.hh" 36#include "base/misc.hh" 37#include "base/types.hh" 38#include "cpu/static_inst.hh" 39 40namespace MipsISA 41{ 42
| 1/* 2 * Copyright (c) 2012 Google 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 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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 29 */ 30 31#ifndef __ARCH_MIPS_DECODER_HH__ 32#define __ARCH_MIPS_DECODER_HH__ 33 34#include "arch/generic/decode_cache.hh" 35#include "arch/mips/types.hh" 36#include "base/misc.hh" 37#include "base/types.hh" 38#include "cpu/static_inst.hh" 39 40namespace MipsISA 41{ 42
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52 {} 53 54 void 55 process() 56 { 57 } 58 59 void 60 reset() 61 { 62 instDone = false; 63 } 64 65 //Use this to give data to the decoder. This should be used 66 //when there is control flow. 67 void 68 moreBytes(const PCState &pc, Addr fetchPC, MachInst inst) 69 { 70 emi = inst; 71 instDone = true; 72 } 73 74 bool 75 needMoreBytes() 76 { 77 return true; 78 } 79 80 bool 81 instReady() 82 { 83 return instDone; 84 } 85 86 void takeOverFrom(Decoder *old) {} 87 88 protected: 89 /// A cache of decoded instruction objects. 90 static GenericISA::BasicDecodeCache defaultCache; 91 92 public: 93 StaticInstPtr decodeInst(ExtMachInst mach_inst); 94 95 /// Decode a machine instruction. 96 /// @param mach_inst The binary instruction to decode. 97 /// @retval A pointer to the corresponding StaticInst object. 98 StaticInstPtr 99 decode(ExtMachInst mach_inst, Addr addr) 100 { 101 return defaultCache.decode(this, mach_inst, addr); 102 } 103 104 StaticInstPtr 105 decode(MipsISA::PCState &nextPC) 106 { 107 if (!instDone) 108 return NULL; 109 instDone = false; 110 return decode(emi, nextPC.instAddr()); 111 } 112}; 113 114} // namespace MipsISA 115 116#endif // __ARCH_MIPS_DECODER_HH__
| 53 {} 54 55 void 56 process() 57 { 58 } 59 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. 68 void 69 moreBytes(const PCState &pc, Addr fetchPC, MachInst inst) 70 { 71 emi = inst; 72 instDone = true; 73 } 74 75 bool 76 needMoreBytes() 77 { 78 return true; 79 } 80 81 bool 82 instReady() 83 { 84 return instDone; 85 } 86 87 void takeOverFrom(Decoder *old) {} 88 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. 99 StaticInstPtr 100 decode(ExtMachInst mach_inst, Addr addr) 101 { 102 return defaultCache.decode(this, mach_inst, addr); 103 } 104 105 StaticInstPtr 106 decode(MipsISA::PCState &nextPC) 107 { 108 if (!instDone) 109 return NULL; 110 instDone = false; 111 return decode(emi, nextPC.instAddr()); 112 } 113}; 114 115} // namespace MipsISA 116 117#endif // __ARCH_MIPS_DECODER_HH__
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