util.isa revision 2632:1bb2f91485ea 
1// -*- mode:c++ -*-
2
3let {{
4def LoadStoreBase(name, Name, ea_code, memacc_code, mem_flags, inst_flags,
5                  postacc_code = '', base_class = 'Memory',
6                  decode_template = BasicDecode, exec_template_base = ''):
7    # Make sure flags are in lists (convert to lists if not).
8    mem_flags = makeList(mem_flags)
9    inst_flags = makeList(inst_flags)
10
11    # add hook to get effective addresses into execution trace output.
12    ea_code += '\nif (traceData) { traceData->setAddr(EA); }\n'
13
14    # generate code block objects
15    ea_cblk = CodeBlock(ea_code)
16    memacc_cblk = CodeBlock(memacc_code)
17    postacc_cblk = CodeBlock(postacc_code)
18
19    # Some CPU models execute the memory operation as an atomic unit,
20    # while others want to separate them into an effective address
21    # computation and a memory access operation.  As a result, we need
22    # to generate three StaticInst objects.  Note that the latter two
23    # are nested inside the larger "atomic" one.
24
25    # generate InstObjParams for EAComp object
26    ea_iop = InstObjParams(name, Name, base_class, ea_cblk, inst_flags)
27
28    # generate InstObjParams for MemAcc object
29    memacc_iop = InstObjParams(name, Name, base_class, memacc_cblk, inst_flags)
30    # in the split execution model, the MemAcc portion is responsible
31    # for the post-access code.
32    memacc_iop.postacc_code = postacc_cblk.code
33
34    # generate InstObjParams for InitiateAcc, CompleteAcc object
35    # The code used depends on the template being used
36    if (exec_template_base == 'Load'):
37        initiateacc_cblk = CodeBlock(ea_code + memacc_code)
38        completeacc_cblk = CodeBlock(memacc_code + postacc_code)
39    elif (exec_template_base == 'Store'):
40        initiateacc_cblk = CodeBlock(ea_code + memacc_code)
41        completeacc_cblk = CodeBlock(postacc_code)
42    else:
43        initiateacc_cblk = ''
44        completeacc_cblk = ''
45
46    initiateacc_iop = InstObjParams(name, Name, base_class, initiateacc_cblk,
47                                    inst_flags)
48
49    completeacc_iop = InstObjParams(name, Name, base_class, completeacc_cblk,
50                                    inst_flags)
51
52    if (exec_template_base == 'Load'):
53        initiateacc_iop.ea_code = ea_cblk.code
54        initiateacc_iop.memacc_code = memacc_cblk.code
55        completeacc_iop.memacc_code = memacc_cblk.code
56        completeacc_iop.postacc_code = postacc_cblk.code
57    elif (exec_template_base == 'Store'):
58        initiateacc_iop.ea_code = ea_cblk.code
59        initiateacc_iop.memacc_code = memacc_cblk.code
60        completeacc_iop.postacc_code = postacc_cblk.code
61
62    # generate InstObjParams for unified execution
63    cblk = CodeBlock(ea_code + memacc_code + postacc_code)
64    iop = InstObjParams(name, Name, base_class, cblk, inst_flags)
65
66    iop.ea_constructor = ea_cblk.constructor
67    iop.ea_code = ea_cblk.code
68    iop.memacc_constructor = memacc_cblk.constructor
69    iop.memacc_code = memacc_cblk.code
70    iop.postacc_code = postacc_cblk.code
71
72    if mem_flags:
73        s = '\n\tmemAccessFlags = ' + string.join(mem_flags, '|') + ';'
74        iop.constructor += s
75        memacc_iop.constructor += s
76
77    # select templates
78    memAccExecTemplate = eval(exec_template_base + 'MemAccExecute')
79    fullExecTemplate = eval(exec_template_base + 'Execute')
80    initiateAccTemplate = eval(exec_template_base + 'InitiateAcc')
81    completeAccTemplate = eval(exec_template_base + 'CompleteAcc')
82
83    # (header_output, decoder_output, decode_block, exec_output)
84    return (LoadStoreDeclare.subst(iop), 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(initiateacc_iop)
90            + completeAccTemplate.subst(completeacc_iop))
91}};
92
93
94output exec {{
95
96    using namespace MipsISA;
97
98    /// CLEAR ALL CPU INST/EXE HAZARDS
99    inline void
100    clear_exe_inst_hazards()
101    {
102        //CODE HERE
103    }
104
105
106    /// Check "FP enabled" machine status bit.  Called when executing any FP
107    /// instruction in full-system mode.
108    /// @retval Full-system mode: NoFault if FP is enabled, FenFault
109    /// if not.  Non-full-system mode: always returns NoFault.
110#if FULL_SYSTEM
111    inline Fault checkFpEnableFault(%(CPU_exec_context)s *xc)
112    {
113        Fault fault = NoFault;	// dummy... this ipr access should not fault
114        if (!Mips34k::ICSR_FPE(xc->readIpr(MipsISA::IPR_ICSR, fault))) {
115            fault = FloatEnableFault;
116        }
117        return fault;
118    }
119#else
120    inline Fault checkFpEnableFault(%(CPU_exec_context)s *xc)
121    {
122        return NoFault;
123    }
124#endif
125
126
127}};
128
129
130