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
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21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29output header {{
30 /**
31 * Static instruction class for unimplemented instructions that
32 * cause simulator termination. Note that these are recognized
33 * (legal) instructions that the simulator does not support; the
34 * 'Unknown' class is used for unrecognized/illegal instructions.
35 * This is a leaf class.
36 */
37 class FailUnimplemented : public AlphaStaticInst
38 {
39 public:
40 /// Constructor
41 FailUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
42 : AlphaStaticInst(_mnemonic, _machInst, No_OpClass)
43 {
44 // don't call execute() (which panics) if we're on a
45 // speculative path
46 flags[IsNonSpeculative] = true;
47 }
48
49 %(BasicExecDeclare)s
50
51 std::string
52 generateDisassembly(Addr pc, const SymbolTable *symtab) const;
53 };
54
55 /**
56 * Base class for unimplemented instructions that cause a warning
57 * to be printed (but do not terminate simulation). This
58 * implementation is a little screwy in that it will print a
59 * warning for each instance of a particular unimplemented machine
60 * instruction, not just for each unimplemented opcode. Should
61 * probably make the 'warned' flag a static member of the derived
62 * class.
63 */
64 class WarnUnimplemented : public AlphaStaticInst
65 {
66 private:
67 /// Have we warned on this instruction yet?
68 mutable bool warned;
69
70 public:
71 /// Constructor
72 WarnUnimplemented(const char *_mnemonic, ExtMachInst _machInst)
73 : AlphaStaticInst(_mnemonic, _machInst, No_OpClass), warned(false)
74 {
75 // don't call execute() (which panics) if we're on a
76 // speculative path
77 flags[IsNonSpeculative] = true;
78 }
79
80 %(BasicExecDeclare)s
81
82 std::string
83 generateDisassembly(Addr pc, const SymbolTable *symtab) const;
84 };
85}};
86
87output decoder {{
88 std::string
89 FailUnimplemented::generateDisassembly(Addr pc,
90 const SymbolTable *symtab) const
91 {
92 return csprintf("%-10s (unimplemented)", mnemonic);
93 }
94
95 std::string
96 WarnUnimplemented::generateDisassembly(Addr pc,
97 const SymbolTable *symtab) const
98 {
99#ifdef SS_COMPATIBLE_DISASSEMBLY
100 return csprintf("%-10s", mnemonic);
101#else
102 return csprintf("%-10s (unimplemented)", mnemonic);
103#endif
104 }
105}};
106
107output exec {{
108 Fault
109 FailUnimplemented::execute(%(CPU_exec_context)s *xc,
110 Trace::InstRecord *traceData) const
111 {
112 panic("attempt to execute unimplemented instruction '%s' "
113 "(inst 0x%08x, opcode 0x%x)", mnemonic, machInst, OPCODE);
114 return new UnimplementedOpcodeFault;
115 }
116
117 Fault
118 WarnUnimplemented::execute(%(CPU_exec_context)s *xc,
119 Trace::InstRecord *traceData) const
120 {
121 if (!warned) {
122 warn("instruction '%s' unimplemented\n", mnemonic);
123 warned = true;
124 }
125
126 return NoFault;
127 }
128}};
129
130
131def format FailUnimpl() {{
132 iop = InstObjParams(name, 'FailUnimplemented')
133 decode_block = BasicDecodeWithMnemonic.subst(iop)
134}};
135
136def format WarnUnimpl() {{
137 iop = InstObjParams(name, 'WarnUnimplemented')
138 decode_block = BasicDecodeWithMnemonic.subst(iop)
139}};
140
141output header {{
142 /**
143 * Static instruction class for unknown (illegal) instructions.
144 * These cause simulator termination if they are executed in a
145 * non-speculative mode. This is a leaf class.
146 */
147 class Unknown : public AlphaStaticInst
148 {
149 public:
150 /// Constructor
151 Unknown(ExtMachInst _machInst)
152 : AlphaStaticInst("unknown", _machInst, No_OpClass)
153 {
154 // don't call execute() (which panics) if we're on a
155 // speculative path
156 flags[IsNonSpeculative] = true;
157 }
158
159 %(BasicExecDeclare)s
160
161 std::string
162 generateDisassembly(Addr pc, const SymbolTable *symtab) const;
163 };
164}};
165