src/arch/alpha/isa/unimp.isa

   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 // Authors: Steve Reinhardt
  30
  31 ////////////////////////////////////////////////////////////////////
  32 //
  33 // Unimplemented instructions
  34 //
  35
  36 output header {{
  37     /**
  38      * Static instruction class for unimplemented instructions that
  39      * cause simulator termination.  Note that these are recognized
  40      * (legal) instructions that the simulator does not support; the
  41      * 'Unknown' class is used for unrecognized/illegal instructions.
  42      * This is a leaf class.
  43      */
  44     class FailUnimplemented : public AlphaStaticInst
  45     {
  46       public:
  47         /// Constructor
  48         FailUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
  49             : AlphaStaticInst(_mnemonic, _machInst, No_OpClass)
  50         {
  51             // don't call execute() (which panics) if we're on a
  52             // speculative path
  53             flags[IsNonSpeculative] = true;
  54         }
  55
  56         %(BasicExecDeclare)s
  57
  58         std::string
  59         generateDisassembly(Addr pc, const SymbolTable *symtab) const;
  60     };
  61
  62     /**
  63      * Base class for unimplemented instructions that cause a warning
  64      * to be printed (but do not terminate simulation).  This
  65      * implementation is a little screwy in that it will print a
  66      * warning for each instance of a particular unimplemented machine
  67      * instruction, not just for each unimplemented opcode.  Should
  68      * probably make the 'warned' flag a static member of the derived
  69      * class.
  70      */
  71     class WarnUnimplemented : public AlphaStaticInst
  72     {
  73       private:
  74         /// Have we warned on this instruction yet?
  75         mutable bool warned;
  76
  77       public:
  78         /// Constructor
  79         WarnUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
  80             : AlphaStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
  81         {
  82             // don't call execute() (which panics) if we're on a
  83             // speculative path
  84             flags[IsNonSpeculative] = true;
  85         }
  86
  87         %(BasicExecDeclare)s
  88
  89         std::string
  90         generateDisassembly(Addr pc, const SymbolTable *symtab) const;
  91     };
  92 }};
  93
  94 output decoder {{
  95     std::string
  96     FailUnimplemented::generateDisassembly(Addr pc,
  97                                            const SymbolTable *symtab) const
  98     {
  99         return csprintf("%-10s (unimplemented)", mnemonic);
 100     }
 101
 102     std::string
 103     WarnUnimplemented::generateDisassembly(Addr pc,
 104                                            const SymbolTable *symtab) const
 105     {
 106 #ifdef SS_COMPATIBLE_DISASSEMBLY
 107         return csprintf("%-10s", mnemonic);
 108 #else
 109         return csprintf("%-10s (unimplemented)", mnemonic);
 110 #endif
 111     }
 112 }};
 113
 114 output exec {{
 115     Fault
 116     FailUnimplemented::execute(%(CPU_exec_context)s *xc,
 117                                Trace::InstRecord *traceData) const
 118     {
 119         panic("attempt to execute unimplemented instruction '%s' "
 120               "(inst 0x%08x, opcode 0x%x)", mnemonic, machInst, OPCODE);
 121         return new UnimplementedOpcodeFault;
 122     }
 123
 124     Fault
 125     WarnUnimplemented::execute(%(CPU_exec_context)s *xc,
 126                                Trace::InstRecord *traceData) const
 127     {
 128         if (!warned) {
 129             warn("instruction '%s' unimplemented\n", mnemonic);
 130             warned = true;
 131         }
 132
 133         return NoFault;
 134     }
 135 }};
 136
 137
 138 def format FailUnimpl() {{
 139     iop = InstObjParams(name, 'FailUnimplemented')
 140     decode_block = BasicDecodeWithMnemonic.subst(iop)
 141 }};
 142
 143 def format WarnUnimpl() {{
 144     iop = InstObjParams(name, 'WarnUnimplemented')
 145     decode_block = BasicDecodeWithMnemonic.subst(iop)
 146 }};
 147
 148 output header {{
 149     /**
 150      * Static instruction class for unknown (illegal) instructions.
 151      * These cause simulator termination if they are executed in a
 152      * non-speculative mode.  This is a leaf class.
 153      */
 154     class Unknown : public AlphaStaticInst
 155     {
 156       public:
 157         /// Constructor
 158         Unknown(ExtMachInst _machInst)
 159             : AlphaStaticInst("unknown", _machInst, No_OpClass)
 160         {
 161             // don't call execute() (which panics) if we're on a
 162             // speculative path
 163             flags[IsNonSpeculative] = true;
 164         }
 165
 166         %(BasicExecDeclare)s
 167
 168         std::string
 169         generateDisassembly(Addr pc, const SymbolTable *symtab) const;
 170     };
 171 }};
 172