branch.cc revision 6262:43950710afdc 
1/* Copyright (c) 2007-2008 The Florida State University
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
9 * notice, this list of conditions and the following disclaimer in the
10 * documentation and/or other materials provided with the distribution;
11 * neither the name of the copyright holders nor the names of its
12 * contributors may be used to endorse or promote products derived from
13 * this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
18 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
19 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
21 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Authors: Stephen Hines
28 */
29
30#include "arch/arm/insts/branch.hh"
31#include "base/loader/symtab.hh"
32
33namespace ArmISA
34{
35Addr
36Branch::branchTarget(Addr branchPC) const
37{
38    return branchPC + 8 + disp;
39}
40
41Addr
42Jump::branchTarget(ThreadContext *tc) const
43{
44    Addr NPC = tc->readPC() + 8;
45    uint64_t Rb = tc->readIntReg(_srcRegIdx[0]);
46    return (Rb & ~3) | (NPC & 1);
47}
48
49const std::string &
50PCDependentDisassembly::disassemble(Addr pc,
51                                    const SymbolTable *symtab) const
52{
53    if (!cachedDisassembly ||
54        pc != cachedPC || symtab != cachedSymtab)
55    {
56        if (cachedDisassembly)
57            delete cachedDisassembly;
58
59        cachedDisassembly =
60            new std::string(generateDisassembly(pc, symtab));
61        cachedPC = pc;
62        cachedSymtab = symtab;
63    }
64
65    return *cachedDisassembly;
66}
67
68std::string
69Branch::generateDisassembly(Addr pc, const SymbolTable *symtab) const
70{
71    std::stringstream ss;
72
73    printMnemonic(ss);
74
75    Addr target = pc + 8 + disp;
76
77    std::string str;
78    if (symtab && symtab->findSymbol(target, str))
79        ss << str;
80    else
81        ccprintf(ss, "0x%x", target);
82
83    return ss.str();
84}
85
86std::string
87BranchExchange::generateDisassembly(Addr pc, const SymbolTable *symtab) const
88{
89    std::stringstream ss;
90    printMnemonic(ss);
91    if (_numSrcRegs > 0) {
92        printReg(ss, _srcRegIdx[0]);
93    }
94    return ss.str();
95}
96
97std::string
98Jump::generateDisassembly(Addr pc, const SymbolTable *symtab) const
99{
100    std::stringstream ss;
101    printMnemonic(ss);
102    return ss.str();
103}
104}
105