branch.isa (12234:78ece221f9f5) branch.isa (12288:f13eec2f5a17)
1// Copyright (c) 2006-2007 The Regents of The University of Michigan
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met: redistributions of source code must retain the above copyright
7// notice, this list of conditions and the following disclaimer;
8// redistributions in binary form must reproduce the above copyright

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27// Authors: Gabe Black
28// Steve Reinhardt
29
30////////////////////////////////////////////////////////////////////
31//
32// Branch instructions
33//
34
1// Copyright (c) 2006-2007 The Regents of The University of Michigan
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met: redistributions of source code must retain the above copyright
7// notice, this list of conditions and the following disclaimer;
8// redistributions in binary form must reproduce the above copyright

--- 18 unchanged lines hidden (view full) ---

27// Authors: Gabe Black
28// Steve Reinhardt
29
30////////////////////////////////////////////////////////////////////
31//
32// Branch instructions
33//
34
35output header {{
36 /**
37 * Base class for branch operations.
38 */
39 class Branch : public SparcStaticInst
40 {
41 protected:
42 // Constructor
43 Branch(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
44 SparcStaticInst(mnem, _machInst, __opClass)
45 {
46 }
47
48 std::string generateDisassembly(Addr pc,
49 const SymbolTable *symtab) const;
50 };
51
52 /**
53 * Base class for branch operations with an immediate displacement.
54 */
55 class BranchDisp : public Branch
56 {
57 protected:
58 // Constructor
59 BranchDisp(const char *mnem, ExtMachInst _machInst,
60 OpClass __opClass) :
61 Branch(mnem, _machInst, __opClass)
62 {
63 }
64
65 std::string generateDisassembly(Addr pc,
66 const SymbolTable *symtab) const;
67
68 int32_t disp;
69 };
70
71 /**
72 * Base class for branches with n bit displacements.
73 */
74 template<int bits>
75 class BranchNBits : public BranchDisp
76 {
77 protected:
78 // Constructor
79 BranchNBits(const char *mnem, ExtMachInst _machInst,
80 OpClass __opClass) :
81 BranchDisp(mnem, _machInst, __opClass)
82 {
83 disp = sext<bits + 2>((_machInst & mask(bits)) << 2);
84 }
85 };
86
87 /**
88 * Base class for 16bit split displacements.
89 */
90 class BranchSplit : public BranchDisp
91 {
92 protected:
93 // Constructor
94 BranchSplit(const char *mnem, ExtMachInst _machInst,
95 OpClass __opClass) :
96 BranchDisp(mnem, _machInst, __opClass)
97 {
98 disp = sext<18>((D16HI << 16) | (D16LO << 2));
99 }
100 };
101
102 /**
103 * Base class for branches that use an immediate and a register to
104 * compute their displacements.
105 */
106 class BranchImm13 : public Branch
107 {
108 protected:
109 // Constructor
110 BranchImm13(const char *mnem, ExtMachInst _machInst, OpClass __opClass) :
111 Branch(mnem, _machInst, __opClass), imm(sext<13>(SIMM13))
112 {
113 }
114
115 std::string generateDisassembly(Addr pc,
116 const SymbolTable *symtab) const;
117
118 int32_t imm;
119 };
120}};
121
122output decoder {{
123
124 template class BranchNBits<19>;
125
126 template class BranchNBits<22>;
127
128 template class BranchNBits<30>;
129
130 std::string
131 Branch::generateDisassembly(Addr pc, const SymbolTable *symtab) const
132 {
133 std::stringstream response;
134
135 printMnemonic(response, mnemonic);
136 printRegArray(response, _srcRegIdx, _numSrcRegs);
137 if (_numDestRegs && _numSrcRegs)
138 response << ", ";
139 printDestReg(response, 0);
140
141 return response.str();
142 }
143
144 std::string
145 BranchImm13::generateDisassembly(Addr pc,
146 const SymbolTable *symtab) const
147 {
148 std::stringstream response;
149
150 printMnemonic(response, mnemonic);
151 printRegArray(response, _srcRegIdx, _numSrcRegs);
152 if (_numSrcRegs > 0)
153 response << ", ";
154 ccprintf(response, "0x%x", imm);
155 if (_numDestRegs > 0)
156 response << ", ";
157 printDestReg(response, 0);
158
159 return response.str();
160 }
161
162 std::string
163 BranchDisp::generateDisassembly(Addr pc,
164 const SymbolTable *symtab) const
165 {
166 std::stringstream response;
167 std::string symbol;
168 Addr symbolAddr;
169
170 Addr target = disp + pc;
171
172 printMnemonic(response, mnemonic);
173 ccprintf(response, "0x%x", target);
174
175 if (symtab &&
176 symtab->findNearestSymbol(target, symbol, symbolAddr)) {
177 ccprintf(response, " <%s", symbol);
178 if (symbolAddr != target)
179 ccprintf(response, "+%d>", target - symbolAddr);
180 else
181 ccprintf(response, ">");
182 }
183
184 return response.str();
185 }
186}};
187
188def template JumpExecute {{
189 Fault %(class_name)s::execute(ExecContext *xc,
190 Trace::InstRecord *traceData) const
191 {
192 // Attempt to execute the instruction
193 Fault fault = NoFault;
194
195 %(op_decl)s;

--- 152 unchanged lines hidden --- 		35def template JumpExecute {{
36 Fault %(class_name)s::execute(ExecContext *xc,
37 Trace::InstRecord *traceData) const
38 {
39 // Attempt to execute the instruction
40 Fault fault = NoFault;
41
42 %(op_decl)s;

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