trap.isa revision 3995 
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
10// documentation and/or other materials provided with the distribution;
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
19// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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
23// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 format Trap(code, *opt_flags) {{
86        iop = InstObjParams(name, Name, 'Trap', code, opt_flags)
87        header_output = BasicDeclare.subst(iop)
88        decoder_output = BasicConstructor.subst(iop)
89        decode_block = BasicDecode.subst(iop)
90        exec_output = TrapExecute.subst(iop)
91}};
92
93output header {{
94        class FpUnimpl : public SparcStaticInst
95        {
96          protected:
97            FpUnimpl(const char *mnem,
98                    ExtMachInst _machInst, OpClass __opClass)
99                : SparcStaticInst(mnem, _machInst, __opClass)
100            {
101            }
102
103            std::string generateDisassembly(Addr pc,
104                    const SymbolTable *symtab) const
105            {
106                return mnemonic;
107            }
108        };
109}};
110
111def format FpUnimpl(*flags) {{
112        fpunimpl_code = '''
113            Fsr = insertBits(Fsr, 16, 14, 3);
114            fault = new FpExceptionOther;
115            '''
116        iop = InstObjParams(name, Name, 'FpUnimpl', fpunimpl_code, flags)
117        header_output = BasicDeclare.subst(iop)
118        decoder_output = BasicConstructor.subst(iop)
119        decode_block = BasicDecode.subst(iop)
120        exec_output = TrapExecute.subst(iop)
121}};
122