trap.isa revision 3996 
1// Copyright (c) 2006-2007 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
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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
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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
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25// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26//
27// Authors: Gabe Black
28//          Steve Reinhardt
29
30////////////////////////////////////////////////////////////////////
31//
32// Trap instructions
33//
34
35output header {{
36        /**
37         * Base class for trap instructions,
38         * or instructions that always fault.
39         */
40        class Trap : public SparcStaticInst
41        {
42          protected:
43
44            // Constructor
45            Trap(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
46                SparcStaticInst(mnem, _machInst, __opClass), trapNum(SW_TRAP)
47            {
48            }
49
50            std::string generateDisassembly(Addr pc,
51                    const SymbolTable *symtab) const;
52
53            int trapNum;
54        };
55}};
56
57output decoder {{
58        std::string Trap::generateDisassembly(Addr pc,
59                const SymbolTable *symtab) const
60        {
61            std::stringstream response;
62
63            printMnemonic(response, mnemonic);
64            ccprintf(response, " ");
65            printReg(response, _srcRegIdx[0]);
66            ccprintf(response, ", 0x%x", trapNum);
67            ccprintf(response, ", or ");
68            printReg(response, _srcRegIdx[1]);
69            return response.str();
70        }
71}};
72
73def template TrapExecute {{
74        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
75                Trace::InstRecord *traceData) const
76        {
77            Fault fault = NoFault;
78            %(op_decl)s;
79            %(op_rd)s;
80            %(code)s
81            return fault;
82        }
83}};
84
85def template FpUnimplExecute {{
86        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
87                Trace::InstRecord *traceData) const
88        {
89            Fault fault = NoFault;
90            %(op_decl)s;
91            %(op_rd)s;
92            %(code)s
93            %(op_wb)s;
94            return fault;
95        }
96}};
97
98def format Trap(code, *opt_flags) {{
99        iop = InstObjParams(name, Name, 'Trap', code, opt_flags)
100        header_output = BasicDeclare.subst(iop)
101        decoder_output = BasicConstructor.subst(iop)
102        decode_block = BasicDecode.subst(iop)
103        exec_output = TrapExecute.subst(iop)
104}};
105
106output header {{
107        class FpUnimpl : public SparcStaticInst
108        {
109          protected:
110            FpUnimpl(const char *mnem,
111                    ExtMachInst _machInst, OpClass __opClass)
112                : SparcStaticInst(mnem, _machInst, __opClass)
113            {
114            }
115
116            std::string generateDisassembly(Addr pc,
117                    const SymbolTable *symtab) const
118            {
119                return mnemonic;
120            }
121        };
122}};
123
124def format FpUnimpl(*flags) {{
125        fpunimpl_code = '''
126            Fsr = insertBits(Fsr, 16, 14, 3);
127            fault = new FpExceptionOther;
128            '''
129        iop = InstObjParams(name, Name, 'FpUnimpl', fpunimpl_code, flags)
130        header_output = BasicDeclare.subst(iop)
131        decoder_output = BasicConstructor.subst(iop)
132        decode_block = BasicDecode.subst(iop)
133        exec_output = FpUnimplExecute.subst(iop)
134}};
135