unimp.isa revision 2706:d88c27f75121
1// -*- mode:c++ -*- 2 3 4// Copyright (c) 2003-2005 The Regents of The University of Michigan 5// All rights reserved. 6// 7// Redistribution and use in source and binary forms, with or without 8// modification, are permitted provided that the following conditions are 9// met: redistributions of source code must retain the above copyright 10// notice, this list of conditions and the following disclaimer; 11// redistributions in binary form must reproduce the above copyright 12// notice, this list of conditions and the following disclaimer in the 13// documentation and/or other materials provided with the distribution; 14// neither the name of the copyright holders nor the names of its 15// contributors may be used to endorse or promote products derived from 16// this software without specific prior written permission. 17// 18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29// 30// Authors: Korey Sewell 31 32//////////////////////////////////////////////////////////////////// 33// 34// Unimplemented instructions 35// 36 37output header {{ 38 /** 39 * Static instruction class for unimplemented instructions that 40 * cause simulator termination. Note that these are recognized 41 * (legal) instructions that the simulator does not support; the 42 * 'Unknown' class is used for unrecognized/illegal instructions. 43 * This is a leaf class. 44 */ 45 class FailUnimplemented : public MipsStaticInst 46 { 47 public: 48 /// Constructor 49 FailUnimplemented(const char *_mnemonic, MachInst _machInst) 50 : MipsStaticInst(_mnemonic, _machInst, No_OpClass) 51 { 52 // don't call execute() (which panics) if we're on a 53 // speculative path 54 flags[IsNonSpeculative] = true; 55 } 56 57 %(BasicExecDeclare)s 58 59 std::string 60 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 61 }; 62 63 /** 64 * Base class for unimplemented instructions that cause a warning 65 * to be printed (but do not terminate simulation). This 66 * implementation is a little screwy in that it will print a 67 * warning for each instance of a particular unimplemented machine 68 * instruction, not just for each unimplemented opcode. Should 69 * probably make the 'warned' flag a static member of the derived 70 * class. 71 */ 72 class WarnUnimplemented : public MipsStaticInst 73 { 74 private: 75 /// Have we warned on this instruction yet? 76 mutable bool warned; 77 78 public: 79 /// Constructor 80 WarnUnimplemented(const char *_mnemonic, MachInst _machInst) 81 : MipsStaticInst(_mnemonic, _machInst, No_OpClass), warned(false) 82 { 83 // don't call execute() (which panics) if we're on a 84 // speculative path 85 flags[IsNonSpeculative] = true; 86 } 87 88 %(BasicExecDeclare)s 89 90 std::string 91 generateDisassembly(Addr pc, const SymbolTable *symtab) const; 92 }; 93}}; 94 95output decoder {{ 96 std::string 97 FailUnimplemented::generateDisassembly(Addr pc, 98 const SymbolTable *symtab) const 99 { 100 return csprintf("%-10s (unimplemented)", mnemonic); 101 } 102 103 std::string 104 WarnUnimplemented::generateDisassembly(Addr pc, 105 const SymbolTable *symtab) const 106 { 107 return csprintf("%-10s (unimplemented)", mnemonic); 108 } 109}}; 110 111output exec {{ 112 Fault 113 FailUnimplemented::execute(%(CPU_exec_context)s *xc, 114 Trace::InstRecord *traceData) const 115 { 116 panic("attempt to execute unimplemented instruction '%s' " 117 "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE, 118 inst2string(machInst)); 119 return new UnimplementedOpcodeFault; 120 } 121 122 Fault 123 WarnUnimplemented::execute(%(CPU_exec_context)s *xc, 124 Trace::InstRecord *traceData) const 125 { 126 if (!warned) { 127 warn("\tinstruction '%s' unimplemented\n", mnemonic); 128 warned = true; 129 } 130 131 return NoFault; 132 } 133}}; 134 135 136def format FailUnimpl() {{ 137 iop = InstObjParams(name, 'FailUnimplemented') 138 decode_block = BasicDecodeWithMnemonic.subst(iop) 139}}; 140 141def format WarnUnimpl() {{ 142 iop = InstObjParams(name, 'WarnUnimplemented') 143 decode_block = BasicDecodeWithMnemonic.subst(iop) 144}}; 145 146