int.isa revision 2649:2fb859a457a2 
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
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////////////////////////////////////////////////////////////////////
30//
31// Integer operate instructions
32//
33
34output header {{
35    /**
36     * Base class for integer immediate instructions.
37     */
38    class IntegerImm : public AlphaStaticInst
39    {
40      protected:
41        /// Immediate operand value (unsigned 8-bit int).
42        uint8_t imm;
43
44        /// Constructor
45        IntegerImm(const char *mnem, ExtMachInst _machInst, OpClass __opClass)
46            : AlphaStaticInst(mnem, _machInst, __opClass), imm(INTIMM)
47        {
48        }
49
50        std::string
51        generateDisassembly(Addr pc, const SymbolTable *symtab) const;
52    };
53}};
54
55output decoder {{
56    std::string
57    IntegerImm::generateDisassembly(Addr pc, const SymbolTable *symtab) const
58    {
59        std::stringstream ss;
60
61        ccprintf(ss, "%-10s ", mnemonic);
62
63        // just print the first source reg... if there's
64        // a second one, it's a read-modify-write dest (Rc),
65        // e.g. for CMOVxx
66        if (_numSrcRegs > 0) {
67            printReg(ss, _srcRegIdx[0]);
68            ss << ",";
69        }
70
71        ss << (int)imm;
72
73        if (_numDestRegs > 0) {
74            ss << ",";
75            printReg(ss, _destRegIdx[0]);
76        }
77
78        return ss.str();
79    }
80}};
81
82
83def template RegOrImmDecode {{
84 {
85     AlphaStaticInst *i =
86         (IMM) ? (AlphaStaticInst *)new %(class_name)sImm(machInst)
87               : (AlphaStaticInst *)new %(class_name)s(machInst);
88     if (RC == 31) {
89         i = makeNop(i);
90     }
91     return i;
92 }
93}};
94
95// Primary format for integer operate instructions:
96// - Generates both reg-reg and reg-imm versions if Rb_or_imm is used.
97// - Generates NOP if RC == 31.
98def format IntegerOperate(code, *opt_flags) {{
99    # If the code block contains 'Rb_or_imm', we define two instructions,
100    # one using 'Rb' and one using 'imm', and have the decoder select
101    # the right one.
102    uses_imm = (code.find('Rb_or_imm') != -1)
103    if uses_imm:
104        orig_code = code
105        # base code is reg version:
106        # rewrite by substituting 'Rb' for 'Rb_or_imm'
107        code = re.sub(r'Rb_or_imm', 'Rb', orig_code)
108        # generate immediate version by substituting 'imm'
109        # note that imm takes no extenstion, so we extend
110        # the regexp to replace any extension as well
111        imm_code = re.sub(r'Rb_or_imm(\.\w+)?', 'imm', orig_code)
112
113    # generate declaration for register version
114    cblk = CodeBlock(code)
115    iop = InstObjParams(name, Name, 'AlphaStaticInst', cblk, opt_flags)
116    header_output = BasicDeclare.subst(iop)
117    decoder_output = BasicConstructor.subst(iop)
118    exec_output = BasicExecute.subst(iop)
119
120    if uses_imm:
121        # append declaration for imm version
122        imm_cblk = CodeBlock(imm_code)
123        imm_iop = InstObjParams(name, Name + 'Imm', 'IntegerImm', imm_cblk,
124                                opt_flags)
125        header_output += BasicDeclare.subst(imm_iop)
126        decoder_output += BasicConstructor.subst(imm_iop)
127        exec_output += BasicExecute.subst(imm_iop)
128        # decode checks IMM bit to pick correct version
129        decode_block = RegOrImmDecode.subst(iop)
130    else:
131        # no imm version: just check for nop
132        decode_block = OperateNopCheckDecode.subst(iop)
133}};
134