pred.isa revision 6273:e46f6767b2c0 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2007-2008 The Florida State University
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
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28//
29// Authors: Stephen Hines
30
31////////////////////////////////////////////////////////////////////
32//
33// Predicated Instruction Execution
34//
35
36let {{
37    predicateTest = 'testPredicate(Cpsr, condCode)'
38}};
39
40def template PredOpExecute {{
41    Fault %(class_name)s::execute(%(CPU_exec_context)s *xc, Trace::InstRecord *traceData) const
42    {
43        Fault fault = NoFault;
44        uint64_t resTemp = 0;
45        resTemp = resTemp;
46        %(op_decl)s;
47        %(op_rd)s;
48
49        if (%(predicate_test)s)
50        {
51            %(code)s;
52            if (fault == NoFault)
53            {
54                %(op_wb)s;
55            }
56        }
57
58        return fault;
59    }
60}};
61
62def template DataDecode {{
63    if (machInst.opcode4 == 0) {
64        if (machInst.sField == 0)
65            return new %(class_name)sImm(machInst);
66        else
67            return new %(class_name)sImmCc(machInst);
68    } else {
69        if (machInst.sField == 0)
70            return new %(class_name)s(machInst);
71        else
72            return new %(class_name)sCc(machInst);
73    }
74}};
75
76def template DataImmDecode {{
77    if (machInst.sField == 0)
78        return new %(class_name)s(machInst);
79    else
80        return new %(class_name)sCc(machInst);
81}};
82
83let {{
84
85    calcCcCode = '''
86        uint16_t _ic, _iv, _iz, _in;
87
88        _in = (resTemp >> 31) & 1;
89        _iz = (resTemp == 0);
90        _iv = %(ivValue)s & 1;
91        _ic = %(icValue)s & 1;
92
93        Cpsr =  _in << 31 | _iz << 30 | _ic << 29 | _iv << 28 |
94            (Cpsr & 0x0FFFFFFF);
95
96        DPRINTF(Arm, "in = %%d\\n", _in);
97        DPRINTF(Arm, "iz = %%d\\n", _iz);
98        DPRINTF(Arm, "ic = %%d\\n", _ic);
99        DPRINTF(Arm, "iv = %%d\\n", _iv);
100        '''
101
102}};
103
104def format DataOp(code, icValue = {{ }},
105                        ivValue = {{ Cpsr<28:> }}) {{
106    regCode = '''uint32_t op2 = shift_rm_rs(Rm, Rs,
107                                            shift, Cpsr<29:0>);
108                 op2 = op2;''' + code
109    immCode = '''uint32_t op2 = shift_rm_imm(Rm, shift_size,
110                                             shift, Cpsr<29:0>);
111                 op2 = op2;''' + code
112    if icValue == " ":
113        icValueReg = 'shift_carry_rs(Rm, Rs, shift, Cpsr<29:>)'
114        icValueImm = 'shift_carry_imm(Rm, shift_size, shift, Cpsr<29:>)'
115    else:
116        icValueReg = icValue
117        icValueImm = icValue
118    regCcCode = calcCcCode % {"icValue" : icValueReg,
119                              "ivValue" : ivValue}
120    immCcCode = calcCcCode % {"icValue" : icValueImm,
121                              "ivValue" : ivValue}
122    regIop = InstObjParams(name, Name, 'PredIntOp',
123                           {"code": regCode,
124                            "predicate_test": predicateTest})
125    immIop = InstObjParams(name, Name + "Imm", 'PredIntOp',
126                           {"code": immCode,
127                            "predicate_test": predicateTest})
128    regCcIop = InstObjParams(name, Name + "Cc", 'PredIntOp',
129                             {"code": regCode + regCcCode,
130                              "predicate_test": predicateTest})
131    immCcIop = InstObjParams(name, Name + "ImmCc", 'PredIntOp',
132                             {"code": immCode + immCcCode,
133                              "predicate_test": predicateTest})
134    header_output = BasicDeclare.subst(regIop) + \
135                    BasicDeclare.subst(immIop) + \
136                    BasicDeclare.subst(regCcIop) + \
137                    BasicDeclare.subst(immCcIop)
138    decoder_output = BasicConstructor.subst(regIop) + \
139                     BasicConstructor.subst(immIop) + \
140                     BasicConstructor.subst(regCcIop) + \
141                     BasicConstructor.subst(immCcIop)
142    exec_output = PredOpExecute.subst(regIop) + \
143                  PredOpExecute.subst(immIop) + \
144                  PredOpExecute.subst(regCcIop) + \
145                  PredOpExecute.subst(immCcIop)
146    decode_block = DataDecode.subst(regIop)
147}};
148
149def format DataImmOp(code,
150                     icValue = {{ (rotate ? rotated_carry:Cpsr<29:>) }},
151                     ivValue = {{ Cpsr<28:> }}) {{
152    code += "resTemp = resTemp;"
153    iop = InstObjParams(name, Name, 'PredImmOp',
154                        {"code": code,
155                         "predicate_test": predicateTest})
156    ccIop = InstObjParams(name, Name + "Cc", 'PredImmOp',
157                          {"code": code + calcCcCode % vars(),
158                           "predicate_test": predicateTest})
159    header_output = BasicDeclare.subst(iop) + \
160                    BasicDeclare.subst(ccIop)
161    decoder_output = BasicConstructor.subst(iop) + \
162                     BasicConstructor.subst(ccIop)
163    exec_output = PredOpExecute.subst(iop) + \
164                  PredOpExecute.subst(ccIop)
165    decode_block = DataImmDecode.subst(iop)
166}};
167
168def format PredOp(code, *opt_flags) {{
169    iop = InstObjParams(name, Name, 'PredOp',
170                        {"code": code,
171                         "predicate_test": predicateTest},
172                        opt_flags)
173    header_output = BasicDeclare.subst(iop)
174    decoder_output = BasicConstructor.subst(iop)
175    decode_block = BasicDecode.subst(iop)
176    exec_output = PredOpExecute.subst(iop)
177}};
178
179def format PredImmOp(code, *opt_flags) {{
180    iop = InstObjParams(name, Name, 'PredImmOp',
181                        {"code": code,
182                         "predicate_test": predicateTest},
183                        opt_flags)
184    header_output = BasicDeclare.subst(iop)
185    decoder_output = BasicConstructor.subst(iop)
186    decode_block = BasicDecode.subst(iop)
187    exec_output = PredOpExecute.subst(iop)
188}};
189
190def format PredImmOpCc(code, icValue, ivValue, *opt_flags) {{
191    ccCode = calcCcCode % vars()
192    code += ccCode;
193    iop = InstObjParams(name, Name, 'PredImmOp',
194                        {"code": code,
195                         "cc_code": ccCode,
196                         "predicate_test": predicateTest},
197                        opt_flags)
198    header_output = BasicDeclare.subst(iop)
199    decoder_output = BasicConstructor.subst(iop)
200    decode_block = BasicDecode.subst(iop)
201    exec_output = PredOpExecute.subst(iop)
202}};
203
204def format PredIntOp(code, *opt_flags) {{
205    new_code = ArmGenericCodeSubs(code)
206    iop = InstObjParams(name, Name, 'PredIntOp',
207                        {"code": new_code,
208                         "predicate_test": predicateTest},
209                        opt_flags)
210    header_output = BasicDeclare.subst(iop)
211    decoder_output = BasicConstructor.subst(iop)
212    decode_block = BasicDecode.subst(iop)
213    exec_output = PredOpExecute.subst(iop)
214}};
215
216def format PredIntOpCc(code, icValue, ivValue, *opt_flags) {{
217    ccCode = calcCcCode % vars()
218    code += ccCode;
219    new_code = ArmGenericCodeSubs(code)
220    iop = InstObjParams(name, Name, 'PredIntOp',
221                        {"code": new_code,
222                         "cc_code": ccCode,
223                         "predicate_test": predicateTest},
224                        opt_flags)
225    header_output = BasicDeclare.subst(iop)
226    decoder_output = BasicConstructor.subst(iop)
227    decode_block = BasicDecode.subst(iop)
228    exec_output = PredOpExecute.subst(iop)
229}};
230
231