3 // Copyright (c) 2003-2005 The Regents of The University of Michigan
4 // All rights reserved.
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15 // this software without specific prior written permission.
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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29 // Authors: Steve Reinhardt
31 ////////////////////////////////////////////////////////////////////
33 // Unimplemented instructions
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.
44 class FailUnimplemented : public AlphaStaticInst
48 FailUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
49 : AlphaStaticInst(_mnemonic, _machInst, No_OpClass)
51 // don't call execute() (which panics) if we're on a
53 flags[IsNonSpeculative] = true;
56 Fault execute(ExecContext *, Trace::InstRecord *) const override;
58 std::string generateDisassembly(
59 Addr pc, const SymbolTable *symtab) const override;
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
71 class WarnUnimplemented : public AlphaStaticInst
74 /// Have we warned on this instruction yet?
79 WarnUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
80 : AlphaStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
82 // don't call execute() (which panics) if we're on a
84 flags[IsNonSpeculative] = true;
87 Fault execute(ExecContext *, Trace::InstRecord *) const override;
89 std::string generateDisassembly(
90 Addr pc, const SymbolTable *symtab) const override;
96 FailUnimplemented::generateDisassembly(Addr pc,
97 const SymbolTable *symtab) const
99 return csprintf("%-10s (unimplemented)", mnemonic);
103 WarnUnimplemented::generateDisassembly(Addr pc,
104 const SymbolTable *symtab) const
106 #ifdef SS_COMPATIBLE_DISASSEMBLY
107 return csprintf("%-10s", mnemonic);
109 return csprintf("%-10s (unimplemented)", mnemonic);
116 FailUnimplemented::execute(ExecContext *xc,
117 Trace::InstRecord *traceData) const
119 panic("attempt to execute unimplemented instruction '%s' "
120 "(inst 0x%08x, opcode 0x%x)", mnemonic, machInst, OPCODE);
121 return std::make_shared<UnimplementedOpcodeFault>();
125 WarnUnimplemented::execute(ExecContext *xc,
126 Trace::InstRecord *traceData) const
129 warn("instruction '%s' unimplemented\n", mnemonic);
138 def format FailUnimpl() {{
139 iop = InstObjParams(name, 'FailUnimplemented')
140 decode_block = BasicDecodeWithMnemonic.subst(iop)
143 def format WarnUnimpl() {{
144 iop = InstObjParams(name, 'WarnUnimplemented')
145 decode_block = BasicDecodeWithMnemonic.subst(iop)
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.
154 class Unknown : public AlphaStaticInst
158 Unknown(ExtMachInst _machInst)
159 : AlphaStaticInst("unknown", _machInst, No_OpClass)
161 // don't call execute() (which panics) if we're on a
163 flags[IsNonSpeculative] = true;
166 Fault execute(ExecContext *, Trace::InstRecord *) const override;
168 std::string generateDisassembly(
169 Addr pc, const SymbolTable *symtab) const override;