basic.isa revision 4394 
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: Ali Saidi
28//          Gabe Black
29//          Steve Reinhardt
30
31// Declarations for execute() methods.
32def template BasicExecDeclare {{
33        Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const;
34}};
35
36// Definitions of execute methods that panic.
37def template BasicExecPanic {{
38        Fault execute(%(CPU_exec_context)s *, Trace::InstRecord *) const
39        {
40            panic("Execute method called when it shouldn't!");
41            M5_DUMMY_RETURN
42        }
43}};
44
45// Basic instruction class declaration template.
46def template BasicDeclare {{
47        /**
48         * Static instruction class for "%(mnemonic)s".
49         */
50        class %(class_name)s : public %(base_class)s
51        {
52          public:
53            // Constructor.
54            %(class_name)s(ExtMachInst machInst);
55            %(BasicExecDeclare)s
56        };
57}};
58
59// Basic instruction class constructor template.
60def template BasicConstructor {{
61        inline %(class_name)s::%(class_name)s(ExtMachInst machInst)
62            : %(base_class)s("%(mnemonic)s", machInst, %(op_class)s)
63        {
64                %(constructor)s;
65        }
66}};
67
68// Basic instruction class execute method template.
69def template BasicExecute {{
70        Fault %(class_name)s::execute(%(CPU_exec_context)s *xc,
71                Trace::InstRecord *traceData) const
72        {
73            Fault fault = NoFault;
74
75            %(fp_enable_check)s;
76            %(op_decl)s;
77            %(op_rd)s;
78            %(code)s;
79
80            if(fault == NoFault)
81            {
82                %(op_wb)s;
83            }
84            return fault;
85        }
86}};
87
88// Basic decode template.
89def template BasicDecode {{
90        return new %(class_name)s(machInst);
91}};
92
93// Basic decode template, passing mnemonic in as string arg to constructor.
94def template BasicDecodeWithMnemonic {{
95    return new %(class_name)s("%(mnemonic)s", machInst);
96}};
97
98// The most basic instruction format... used only for a few misc. insts
99def format BasicOperate(code, *flags) {{
100        code = filterDoubles(code)
101        iop = InstObjParams(name, Name, 'SparcStaticInst', code, flags)
102        header_output = BasicDeclare.subst(iop)
103        decoder_output = BasicConstructor.subst(iop)
104        decode_block = BasicDecode.subst(iop)
105        exec_output = BasicExecute.subst(iop)
106}};
107
108def format FpBasic(code, *flags) {{
109        fp_code = """
110    Fsr |= bits(Fsr,4,0) << 5;
111    Fsr = insertBits(Fsr,4,0,0);
112    int newrnd = M5_FE_TONEAREST;
113    switch (Fsr<31:30>) {
114      case 0: newrnd = M5_FE_TONEAREST; break;
115      case 1: newrnd = M5_FE_TOWARDZERO; break;
116      case 2: newrnd = M5_FE_UPWARD; break;
117      case 3: newrnd = M5_FE_DOWNWARD; break;
118    }
119    int oldrnd = m5_fegetround();
120    m5_fesetround(newrnd);
121"""
122
123        fp_code += code
124
125
126        fp_code += """
127   m5_fesetround(oldrnd);
128"""
129        fp_code = filterDoubles(fp_code)
130        iop = InstObjParams(name, Name, 'SparcStaticInst', fp_code, flags)
131        header_output = BasicDeclare.subst(iop)
132        decoder_output = BasicConstructor.subst(iop)
133        decode_block = BasicDecode.subst(iop)
134        exec_output = BasicExecute.subst(iop)
135}};
136