int.isa revision 2632:1bb2f91485ea 
1// -*- mode:c++ -*-
2
3// Copyright (c) 2003-2005 The Regents of The University of Michigan
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
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27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29output header {{
30    /**
31     * Base class for integer immediate instructions.
32     */
33    class IntegerImm : public AlphaStaticInst
34    {
35      protected:
36        /// Immediate operand value (unsigned 8-bit int).
37        uint8_t imm;
38
39        /// Constructor
40        IntegerImm(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
41            : AlphaStaticInst(mnem, _machInst, __opClass), imm(INTIMM)
42        {
43        }
44
45        std::string
46        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
47    };
48}};
49
50output decoder {{
51    std::string
52    IntegerImm::generateDisassembly(Addr pc, const SymbolTable *symtab) const
53    {
54        std::stringstream ss;
55
56        ccprintf(ss, "%-10s ", mnemonic);
57
58        // just print the first source reg... if there's
59        // a second one, it's a read-modify-write dest (Rc),
60        // e.g. for CMOVxx
61        if (_numSrcRegs > 0) {
62            printReg(ss, _srcRegIdx[0]);
63            ss << ",";
64        }
65
66        ss << (int)imm;
67
68        if (_numDestRegs > 0) {
69            ss << ",";
70            printReg(ss, _destRegIdx[0]);
71        }
72
73        return ss.str();
74    }
75}};
76
77
78def template RegOrImmDecode {{
79 {
80     AlphaStaticInst *i =
81         (IMM) ? (AlphaStaticInst *)new %(class_name)sImm(machInst)
82               : (AlphaStaticInst *)new %(class_name)s(machInst);
83     if (RC == 31) {
84         i = makeNop(i);
85     }
86     return i;
87 }
88}};
89
90// Primary format for integer operate instructions:
91// - Generates both reg-reg and reg-imm versions if Rb_or_imm is used.
92// - Generates NOP if RC == 31.
93def format IntegerOperate(code, *opt_flags) {{
94    # If the code block contains 'Rb_or_imm', we define two instructions,
95    # one using 'Rb' and one using 'imm', and have the decoder select
96    # the right one.
97    uses_imm = (code.find('Rb_or_imm') != -1)
98    if uses_imm:
99        orig_code = code
100        # base code is reg version:
101        # rewrite by substituting 'Rb' for 'Rb_or_imm'
102        code = re.sub(r'Rb_or_imm', 'Rb', orig_code)
103        # generate immediate version by substituting 'imm'
104        # note that imm takes no extenstion, so we extend
105        # the regexp to replace any extension as well
106        imm_code = re.sub(r'Rb_or_imm(\.\w+)?', 'imm', orig_code)
107
108    # generate declaration for register version
109    cblk = CodeBlock(code)
110    iop = InstObjParams(name, Name, 'AlphaStaticInst', cblk, opt_flags)
111    header_output = BasicDeclare.subst(iop)
112    decoder_output = BasicConstructor.subst(iop)
113    exec_output = BasicExecute.subst(iop)
114
115    if uses_imm:
116        # append declaration for imm version
117        imm_cblk = CodeBlock(imm_code)
118        imm_iop = InstObjParams(name, Name + 'Imm', 'IntegerImm', imm_cblk,
119                                opt_flags)
120        header_output += BasicDeclare.subst(imm_iop)
121        decoder_output += BasicConstructor.subst(imm_iop)
122        exec_output += BasicExecute.subst(imm_iop)
123        # decode checks IMM bit to pick correct version
124        decode_block = RegOrImmDecode.subst(iop)
125    else:
126        # no imm version: just check for nop
127        decode_block = OperateNopCheckDecode.subst(iop)
128}};
129