int.isa revision 2649:2fb859a457a2
1// -*- mode:c++ -*- 2 3// Copyright (c) 2003-2005 The Regents of The University of Michigan 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 12// documentation and/or other materials provided with the distribution; 13// neither the name of the copyright holders nor the names of its 14// contributors may be used to endorse or promote products derived from 15// this software without specific prior written permission. 16// 17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 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//////////////////////////////////////////////////////////////////// 30// 31// Integer operate instructions 32// 33 34output header {{ 35 /** 36 * Base class for integer immediate instructions. 37 */ 38 class IntegerImm : public AlphaStaticInst 39 { 40 protected: 41 /// Immediate operand value (unsigned 8-bit int). 42 uint8_t imm; 43 44 /// Constructor 45 IntegerImm(const char *mnem, ExtMachInst _machInst, OpClass __opClass) 46 : AlphaStaticInst(mnem, _machInst, __opClass), imm(INTIMM) 47 { 48 } 49 50 std::string 51 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 52 }; 53}}; 54 55output decoder {{ 56 std::string 57 IntegerImm::generateDisassembly(Addr pc, const SymbolTable *symtab) const 58 { 59 std::stringstream ss; 60 61 ccprintf(ss, "%-10s ", mnemonic); 62 63 // just print the first source reg... if there's 64 // a second one, it's a read-modify-write dest (Rc), 65 // e.g. for CMOVxx 66 if (_numSrcRegs > 0) { 67 printReg(ss, _srcRegIdx[0]); 68 ss << ","; 69 } 70 71 ss << (int)imm; 72 73 if (_numDestRegs > 0) { 74 ss << ","; 75 printReg(ss, _destRegIdx[0]); 76 } 77 78 return ss.str(); 79 } 80}}; 81 82 83def template RegOrImmDecode {{ 84 { 85 AlphaStaticInst *i = 86 (IMM) ? (AlphaStaticInst *)new %(class_name)sImm(machInst) 87 : (AlphaStaticInst *)new %(class_name)s(machInst); 88 if (RC == 31) { 89 i = makeNop(i); 90 } 91 return i; 92 } 93}}; 94 95// Primary format for integer operate instructions: 96// - Generates both reg-reg and reg-imm versions if Rb_or_imm is used. 97// - Generates NOP if RC == 31. 98def format IntegerOperate(code, *opt_flags) {{ 99 # If the code block contains 'Rb_or_imm', we define two instructions, 100 # one using 'Rb' and one using 'imm', and have the decoder select 101 # the right one. 102 uses_imm = (code.find('Rb_or_imm') != -1) 103 if uses_imm: 104 orig_code = code 105 # base code is reg version: 106 # rewrite by substituting 'Rb' for 'Rb_or_imm' 107 code = re.sub(r'Rb_or_imm', 'Rb', orig_code) 108 # generate immediate version by substituting 'imm' 109 # note that imm takes no extenstion, so we extend 110 # the regexp to replace any extension as well 111 imm_code = re.sub(r'Rb_or_imm(\.\w+)?', 'imm', orig_code) 112 113 # generate declaration for register version 114 cblk = CodeBlock(code) 115 iop = InstObjParams(name, Name, 'AlphaStaticInst', cblk, opt_flags) 116 header_output = BasicDeclare.subst(iop) 117 decoder_output = BasicConstructor.subst(iop) 118 exec_output = BasicExecute.subst(iop) 119 120 if uses_imm: 121 # append declaration for imm version 122 imm_cblk = CodeBlock(imm_code) 123 imm_iop = InstObjParams(name, Name + 'Imm', 'IntegerImm', imm_cblk, 124 opt_flags) 125 header_output += BasicDeclare.subst(imm_iop) 126 decoder_output += BasicConstructor.subst(imm_iop) 127 exec_output += BasicExecute.subst(imm_iop) 128 # decode checks IMM bit to pick correct version 129 decode_block = RegOrImmDecode.subst(iop) 130 else: 131 # no imm version: just check for nop 132 decode_block = OperateNopCheckDecode.subst(iop) 133}}; 134