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
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}};