branch.cc revision 6691:cd68b6ecd68d 
1/*
2 * Copyright (c) 2009 The University of Edinburgh
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Timothy M. Jones
29 */
30
31#include "arch/power/insts/branch.hh"
32#include "base/loader/symtab.hh"
33
34using namespace PowerISA;
35
36const std::string &
37PCDependentDisassembly::disassemble(Addr pc, const SymbolTable *symtab) const
38{
39    if (!cachedDisassembly ||
40        pc != cachedPC || symtab != cachedSymtab)
41    {
42        if (cachedDisassembly)
43            delete cachedDisassembly;
44
45        cachedDisassembly =
46            new std::string(generateDisassembly(pc, symtab));
47        cachedPC = pc;
48        cachedSymtab = symtab;
49    }
50
51    return *cachedDisassembly;
52}
53
54Addr
55BranchPCRel::branchTarget(Addr pc) const
56{
57    return (uint32_t)(pc + disp);
58}
59
60std::string
61BranchPCRel::generateDisassembly(Addr pc, const SymbolTable *symtab) const
62{
63    std::stringstream ss;
64
65    ccprintf(ss, "%-10s ", mnemonic);
66
67    Addr target = pc + disp;
68
69    std::string str;
70    if (symtab && symtab->findSymbol(target, str))
71        ss << str;
72    else
73        ccprintf(ss, "0x%x", target);
74
75    return ss.str();
76}
77
78Addr
79BranchNonPCRel::branchTarget(Addr pc) const
80{
81    return targetAddr;
82}
83
84std::string
85BranchNonPCRel::generateDisassembly(Addr pc, const SymbolTable *symtab) const
86{
87    std::stringstream ss;
88
89    ccprintf(ss, "%-10s ", mnemonic);
90
91    std::string str;
92    if (symtab && symtab->findSymbol(targetAddr, str))
93        ss << str;
94    else
95        ccprintf(ss, "0x%x", targetAddr);
96
97    return ss.str();
98}
99
100Addr
101BranchPCRelCond::branchTarget(Addr pc) const
102{
103    return (uint32_t)(pc + disp);
104}
105
106std::string
107BranchPCRelCond::generateDisassembly(Addr pc, const SymbolTable *symtab) const
108{
109    std::stringstream ss;
110
111    ccprintf(ss, "%-10s ", mnemonic);
112
113    ss << bo << ", " << bi << ", ";
114
115    Addr target = pc + disp;
116
117    std::string str;
118    if (symtab && symtab->findSymbol(target, str))
119        ss << str;
120    else
121        ccprintf(ss, "0x%x", target);
122
123    return ss.str();
124}
125
126Addr
127BranchNonPCRelCond::branchTarget(Addr pc) const
128{
129    return targetAddr;
130}
131
132std::string
133BranchNonPCRelCond::generateDisassembly(Addr pc,
134                                        const SymbolTable *symtab) const
135{
136    std::stringstream ss;
137
138    ccprintf(ss, "%-10s ", mnemonic);
139
140    ss << bo << ", " << bi << ", ";
141
142    std::string str;
143    if (symtab && symtab->findSymbol(targetAddr, str))
144        ss << str;
145    else
146        ccprintf(ss, "0x%x", targetAddr);
147
148    return ss.str();
149}
150
151Addr
152BranchRegCond::branchTarget(ThreadContext *tc) const
153{
154    uint32_t regVal = tc->readIntReg(_srcRegIdx[_numSrcRegs - 1]);
155    return (regVal & 0xfffffffc);
156}
157
158std::string
159BranchRegCond::generateDisassembly(Addr pc,
160                                   const SymbolTable *symtab) const
161{
162    std::stringstream ss;
163
164    ccprintf(ss, "%-10s ", mnemonic);
165
166    ss << bo << ", " << bi << ", ";
167
168    return ss.str();
169}
170