util.isa revision 3953 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2006 The Regents of The University of Michigan
4// All rights reserved.
5//
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7// modification, are permitted provided that the following conditions are
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10// redistributions in binary form must reproduce the above copyright
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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
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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
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27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28//
29// Authors: Steve Reinhardt
30//          Korey Sewell
31
32let {{
33def LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
34                  postacc_code = '', base_class = 'Memory',
35                  decode_template = BasicDecode, exec_template_base = ''):
36    # Make sure flags are in lists (convert to lists if not).
37    mem_flags = makeList(mem_flags)
38    inst_flags = makeList(inst_flags)
39
40    # add hook to get effective addresses into execution trace output.
41    ea_code += '\nif (traceData) { traceData->setAddr(EA); }\n'
42
43    # Some CPU models execute the memory operation as an atomic unit,
44    # while others want to separate them into an effective address
45    # computation and a memory access operation.  As a result, we need
46    # to generate three StaticInst objects.  Note that the latter two
47    # are nested inside the larger "atomic" one.
48
49    # Generate InstObjParams for each of the three objects.  Note that
50    # they differ only in the set of code objects contained (which in
51    # turn affects the object's overall operand list).
52    iop = InstObjParams(name, Name, base_class,
53                        { 'ea_code':ea_code, 'memacc_code':memacc_code, 'postacc_code':postacc_code },
54                        inst_flags)
55    ea_iop = InstObjParams(name, Name, base_class,
56                        { 'ea_code':ea_code },
57                        inst_flags)
58    memacc_iop = InstObjParams(name, Name, base_class,
59                        { 'memacc_code':memacc_code, 'postacc_code':postacc_code },
60                        inst_flags)
61
62    if mem_flags:
63        s = '\n\tmemAccessFlags = ' + string.join(mem_flags, '|') + ';'
64        iop.constructor += s
65        memacc_iop.constructor += s
66
67    # select templates
68
69    # define aliases... most StoreCond templates are the same as the
70    # corresponding Store templates (only CompleteAcc is different).
71    StoreCondMemAccExecute = StoreMemAccExecute
72    StoreCondExecute = StoreExecute
73    StoreCondInitiateAcc = StoreInitiateAcc
74
75    memAccExecTemplate = eval(exec_template_base + 'MemAccExecute')
76    fullExecTemplate = eval(exec_template_base + 'Execute')
77    initiateAccTemplate = eval(exec_template_base + 'InitiateAcc')
78    completeAccTemplate = eval(exec_template_base + 'CompleteAcc')
79
80    # (header_output, decoder_output, decode_block, exec_output)
81    return (LoadStoreDeclare.subst(iop),
82            EACompConstructor.subst(ea_iop)
83            + MemAccConstructor.subst(memacc_iop)
84            + LoadStoreConstructor.subst(iop),
85            decode_template.subst(iop),
86            EACompExecute.subst(ea_iop)
87            + memAccExecTemplate.subst(memacc_iop)
88            + fullExecTemplate.subst(iop)
89            + initiateAccTemplate.subst(iop)
90            + completeAccTemplate.subst(iop))
91}};
92
93
94output header {{
95        std::string inst2string(MachInst machInst);
96}};
97
98output decoder {{
99
100std::string inst2string(MachInst machInst)
101{
102    std::string str = "";
103    uint32_t mask = 0x80000000;
104
105    for(int i=0; i < 32; i++) {
106        if ((machInst & mask) == 0) {
107            str += "0";
108        } else {
109            str += "1";
110        }
111
112        mask = mask >> 1;
113    }
114
115    return str;
116}
117
118}};
119output exec {{
120
121    using namespace MipsISA;
122
123    /// CLEAR ALL CPU INST/EXE HAZARDS
124    inline void
125    clear_exe_inst_hazards()
126    {
127        //CODE HERE
128    }
129
130
131    /// Check "FP enabled" machine status bit.  Called when executing any FP
132    /// instruction in full-system mode.
133    /// @retval Full-system mode: NoFault if FP is enabled, FenFault
134    /// if not.  Non-full-system mode: always returns NoFault.
135#if FULL_SYSTEM
136    inline Fault checkFpEnableFault(%(CPU_exec_context)s *xc)
137    {
138        Fault fault = NoFault;	// dummy... this ipr access should not fault
139        if (!Mips34k::ICSR_FPE(xc->readIpr(MipsISA::IPR_ICSR, fault))) {
140            fault = FloatEnableFault;
141        }
142        return fault;
143    }
144#else
145    inline Fault checkFpEnableFault(%(CPU_exec_context)s *xc)
146    {
147        return NoFault;
148    }
149#endif
150
151
152
153}};
154
155
156