priv.isa revision 2646
1// Copyright (c) 2006 The Regents of The University of Michigan 2// All rights reserved. 3// 4// Redistribution and use in source and binary forms, with or without 5// modification, are permitted provided that the following conditions are 6// met: redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer; 8// redistributions in binary form must reproduce the above copyright 9// notice, this list of conditions and the following disclaimer in the 10// documentation and/or other materials provided with the distribution; 11// neither the name of the copyright holders nor the names of its 12// contributors may be used to endorse or promote products derived from 13// this software without specific prior written permission. 14// 15// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26// 27// Authors: Ali Saidi 28// Gabe Black 29// Steve Reinhardt 30 31//////////////////////////////////////////////////////////////////// 32// 33// Privilege mode instructions 34// 35 36output header {{ 37 /** 38 * Base class for privelege mode operations. 39 */ 40 class Priv : public SparcStaticInst 41 { 42 protected: 43 // Constructor 44 Priv(const char *mnem, ExtMachInst _machInst, OpClass __opClass) : 45 SparcStaticInst(mnem, _machInst, __opClass) 46 { 47 } 48 49 std::string generateDisassembly(Addr pc, 50 const SymbolTable *symtab) const; 51 }; 52 53 /** 54 * Base class for privelege mode operations with immediates. 55 */ 56 class PrivImm : public Priv 57 { 58 protected: 59 // Constructor 60 PrivImm(const char *mnem, ExtMachInst _machInst, 61 OpClass __opClass) : 62 Priv(mnem, _machInst, __opClass), imm(SIMM13) 63 { 64 } 65 66 int32_t imm; 67 }; 68 69}}; 70 71output decoder {{ 72 std::string Priv::generateDisassembly(Addr pc, 73 const SymbolTable *symtab) const 74 { 75 return "Privileged Instruction"; 76 } 77}}; 78 79def template PrivExecute {{ 80 Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, 81 Trace::InstRecord *traceData) const 82 { 83 %(op_decl)s; 84 %(op_rd)s; 85 86 //If the processor isn't in privileged mode, fault out right away 87 if(%(check)s) 88 return new PrivilegedAction; 89 90 %(code)s; 91 %(op_wb)s; 92 return NoFault; 93 } 94}}; 95 96let {{ 97 def doPrivFormat(code, checkCode, name, Name, opt_flags): 98 (usesImm, code, immCode, 99 rString, iString) = splitOutImm(code) 100 iop = InstObjParams(name, Name, 'Priv', code, 101 opt_flags, ("check", checkCode)) 102 header_output = BasicDeclare.subst(iop) 103 decoder_output = BasicConstructor.subst(iop) 104 exec_output = PrivExecute.subst(iop) 105 if usesImm: 106 imm_iop = InstObjParams(name, Name + 'Imm', 'PrivImm', 107 immCode, opt_flags, ("check", checkCode)) 108 header_output += BasicDeclare.subst(imm_iop) 109 decoder_output += BasicConstructor.subst(imm_iop) 110 exec_output += PrivExecute.subst(imm_iop) 111 decode_block = ROrImmDecode.subst(iop) 112 else: 113 decode_block = BasicDecode.subst(iop) 114 return (header_output, decoder_output, exec_output, decode_block) 115}}; 116 117// Primary format for integer operate instructions: 118def format Priv(code, *opt_flags) {{ 119 checkCode = "((xc->readMiscReg(PrStart + MISCREG_PSTATE))<2:2>)" 120 (header_output, decoder_output, 121 exec_output, decode_block) = doPrivFormat(code, 122 checkCode, name, Name, opt_flags) 123}}; 124 125 126