branch.cc revision 11793 
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
33#include "base/loader/symtab.hh"
34#include "cpu/thread_context.hh"
35
36using namespace PowerISA;
37
38const std::string &
39PCDependentDisassembly::disassemble(Addr pc, const SymbolTable *symtab) const
40{
41    if (!cachedDisassembly ||
42        pc != cachedPC || symtab != cachedSymtab)
43    {
44        if (cachedDisassembly)
45            delete cachedDisassembly;
46
47        cachedDisassembly =
48            new std::string(generateDisassembly(pc, symtab));
49        cachedPC = pc;
50        cachedSymtab = symtab;
51    }
52
53    return *cachedDisassembly;
54}
55
56PowerISA::PCState
57BranchPCRel::branchTarget(const PowerISA::PCState &pc) const
58{
59    return (uint32_t)(pc.pc() + disp);
60}
61
62std::string
63BranchPCRel::generateDisassembly(Addr pc, const SymbolTable *symtab) const
64{
65    std::stringstream ss;
66
67    ccprintf(ss, "%-10s ", mnemonic);
68
69    Addr target = pc + disp;
70
71    std::string str;
72    if (symtab && symtab->findSymbol(target, str))
73        ss << str;
74    else
75        ccprintf(ss, "0x%x", target);
76
77    return ss.str();
78}
79
80PowerISA::PCState
81BranchNonPCRel::branchTarget(const PowerISA::PCState &pc) const
82{
83    return targetAddr;
84}
85
86std::string
87BranchNonPCRel::generateDisassembly(Addr pc, const SymbolTable *symtab) const
88{
89    std::stringstream ss;
90
91    ccprintf(ss, "%-10s ", mnemonic);
92
93    std::string str;
94    if (symtab && symtab->findSymbol(targetAddr, str))
95        ss << str;
96    else
97        ccprintf(ss, "0x%x", targetAddr);
98
99    return ss.str();
100}
101
102PowerISA::PCState
103BranchPCRelCond::branchTarget(const PowerISA::PCState &pc) const
104{
105    return (uint32_t)(pc.pc() + disp);
106}
107
108std::string
109BranchPCRelCond::generateDisassembly(Addr pc, const SymbolTable *symtab) const
110{
111    std::stringstream ss;
112
113    ccprintf(ss, "%-10s ", mnemonic);
114
115    ss << bo << ", " << bi << ", ";
116
117    Addr target = pc + disp;
118
119    std::string str;
120    if (symtab && symtab->findSymbol(target, str))
121        ss << str;
122    else
123        ccprintf(ss, "0x%x", target);
124
125    return ss.str();
126}
127
128PowerISA::PCState
129BranchNonPCRelCond::branchTarget(const PowerISA::PCState &pc) const
130{
131    return targetAddr;
132}
133
134std::string
135BranchNonPCRelCond::generateDisassembly(Addr pc,
136                                        const SymbolTable *symtab) const
137{
138    std::stringstream ss;
139
140    ccprintf(ss, "%-10s ", mnemonic);
141
142    ss << bo << ", " << bi << ", ";
143
144    std::string str;
145    if (symtab && symtab->findSymbol(targetAddr, str))
146        ss << str;
147    else
148        ccprintf(ss, "0x%x", targetAddr);
149
150    return ss.str();
151}
152
153PowerISA::PCState
154BranchRegCond::branchTarget(ThreadContext *tc) const
155{
156    uint32_t regVal = tc->readIntReg(_srcRegIdx[_numSrcRegs - 1]);
157    return regVal & 0xfffffffc;
158}
159
160std::string
161BranchRegCond::generateDisassembly(Addr pc,
162                                   const SymbolTable *symtab) const
163{
164    std::stringstream ss;
165
166    ccprintf(ss, "%-10s ", mnemonic);
167
168    ss << bo << ", " << bi << ", ";
169
170    return ss.str();
171}
172