1// -*- mode:c++ -*-
2
3// Copyright (c) 2003-2005 The Regents of The University of Michigan
4// All rights reserved.
5//
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7// modification, are permitted provided that the following conditions are
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10// redistributions in binary form must reproduce the above copyright
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15// this software without specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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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 MipsStaticInst
38 {
39 public:
40 /// Constructor
41 FailUnimplemented(const char *_mnemonic, MachInst _machInst)
42 : MipsStaticInst(_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 MipsStaticInst
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, MachInst _machInst)
73 : MipsStaticInst(_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 return csprintf("%-10s (unimplemented)", mnemonic);
100 }
101}};
102
103output exec {{
104 Fault
105 FailUnimplemented::execute(%(CPU_exec_context)s *xc,
106 Trace::InstRecord *traceData) const
107 {
108 panic("attempt to execute unimplemented instruction '%s' "
109 "(inst 0x%08x, opcode 0x%x, binary:%s)", mnemonic, machInst, OPCODE,
110 inst2string(machInst));
111 return new UnimplementedOpcodeFault;
112 }
113
114 Fault
115 WarnUnimplemented::execute(%(CPU_exec_context)s *xc,
116 Trace::InstRecord *traceData) const
117 {
118 if (!warned) {
119 warn("\tinstruction '%s' unimplemented\n", mnemonic);
120 warned = true;
121 }
122
123 return NoFault;
124 }
125}};
126
127
128def format FailUnimpl() {{
129 iop = InstObjParams(name, 'FailUnimplemented')
130 decode_block = BasicDecodeWithMnemonic.subst(iop)
131}};
132
133def format WarnUnimpl() {{
134 iop = InstObjParams(name, 'WarnUnimplemented')
135 decode_block = BasicDecodeWithMnemonic.subst(iop)
136}};
137