priv.isa revision 2632 
1// Copyright (c) 2006 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: Ali Saidi
28//          Gabe Black
29//          Steve Reinhardt
30
31////////////////////////////////////////////////////////////////////
32//
33// Privilege mode instructions
34//
35
36output header {{
37        /**
38         * Base class for privelege mode operations.
39         */
40        class Priv : public SparcStaticInst
41        {
42          protected:
43            // Constructor
44            Priv(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
45                SparcStaticInst(mnem, _machInst, __opClass)
46            {
47            }
48
49            std::string generateDisassembly(Addr pc,
50                    const SymbolTable *symtab) const;
51        };
52
53        /**
54         * Base class for user mode "tick" access.
55         */
56        class PrivTick : public SparcStaticInst
57        {
58          protected:
59            // Constructor
60            PrivTick(const char *mnem, ExtMachInst _machInst,
61                    OpClass __opClass) :
62                SparcStaticInst(mnem, _machInst, __opClass)
63            {
64            }
65
66            std::string generateDisassembly(Addr pc,
67                    const SymbolTable *symtab) const;
68        };
69
70        /**
71         * Base class for privelege mode operations with immediates.
72         */
73        class PrivImm : public Priv
74        {
75          protected:
76            // Constructor
77            PrivImm(const char *mnem, ExtMachInst _machInst,
78                    OpClass __opClass) :
79                Priv(mnem, _machInst, __opClass), imm(SIMM13)
80            {
81            }
82
83            int32_t imm;
84        };
85
86        /**
87         * Base class for user mode "tick" access with immediates.
88         */
89        class PrivTickImm : public PrivTick
90        {
91          protected:
92            // Constructor
93            PrivTickImm(const char *mnem, ExtMachInst _machInst,
94                    OpClass __opClass) :
95                PrivTick(mnem, _machInst, __opClass), imm(SIMM13)
96            {
97            }
98
99            int32_t imm;
100        };
101}};
102
103output decoder {{
104        std::string Priv::generateDisassembly(Addr pc,
105                const SymbolTable *symtab) const
106        {
107                return "Privileged Instruction";
108        }
109
110        std::string PrivTick::generateDisassembly(Addr pc,
111                const SymbolTable *symtab) const
112        {
113                return "Regular access to Tick";
114        }
115}};
116
117def template PrivExecute {{
118    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
119            Trace::InstRecord *traceData) const
120    {
121        %(op_decl)s;
122        %(op_rd)s;
123
124        //If the processor isn't in privileged mode, fault out right away
125        if(%(check)s)
126            return new PrivilegedAction;
127
128        %(code)s;
129        %(op_wb)s;
130        return NoFault;
131    }
132}};
133
134let {{
135    def doPrivFormat(code, checkCode, name, Name, opt_flags):
136        (usesImm, code, immCode,
137         rString, iString) = splitOutImm(code)
138        iop = InstObjParams(name, Name, 'Priv', code,
139                opt_flags, ("check", checkCode))
140        header_output = BasicDeclare.subst(iop)
141        decoder_output = BasicConstructor.subst(iop)
142        exec_output = PrivExecute.subst(iop)
143        if usesImm:
144            imm_iop = InstObjParams(name, Name + 'Imm', 'PrivImm',
145                    immCode, opt_flags, ("check", checkCode))
146            header_output += BasicDeclare.subst(imm_iop)
147            decoder_output += BasicConstructor.subst(imm_iop)
148            exec_output += PrivExecute.subst(imm_iop)
149            decode_block = ROrImmDecode.subst(iop)
150        else:
151            decode_block = BasicDecode.subst(iop)
152        return (header_output, decoder_output, exec_output, decode_block)
153}};
154
155// Primary format for integer operate instructions:
156def format Priv(code, *opt_flags) {{
157        checkCode = "(!PstatePriv)"
158        (header_output, decoder_output,
159         exec_output, decode_block) = doPrivFormat(code,
160             checkCode, name, Name, opt_flags)
161}};
162
163// Primary format for integer operate instructions:
164def format PrivTick(code, *opt_flags) {{
165        checkCode = "(!PstatePriv && TickNpt)"
166        (header_output, decoder_output,
167         exec_output, decode_block) = doPrivFormat(code,
168             checkCode, name, Name, opt_flags)
169}};
170