utility.hh revision 8229 
1/*
2 * Copyright (c) 2010 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2003-2005 The Regents of The University of Michigan
15 * Copyright (c) 2007-2008 The Florida State University
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions are
20 * met: redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer;
22 * redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution;
25 * neither the name of the copyright holders nor the names of its
26 * contributors may be used to endorse or promote products derived from
27 * this software without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 *
41 * Authors: Korey Sewell
42 *          Stephen Hines
43 */
44
45#ifndef __ARCH_ARM_UTILITY_HH__
46#define __ARCH_ARM_UTILITY_HH__
47
48#include "arch/arm/isa_traits.hh"
49#include "arch/arm/miscregs.hh"
50#include "arch/arm/types.hh"
51#include "base/misc.hh"
52#include "base/trace.hh"
53#include "base/types.hh"
54#include "cpu/static_inst.hh"
55#include "cpu/thread_context.hh"
56
57namespace ArmISA {
58
59inline PCState
60buildRetPC(const PCState &curPC, const PCState &callPC)
61{
62    PCState retPC = callPC;
63    retPC.uEnd();
64    return retPC;
65}
66
67inline bool
68testPredicate(CPSR cpsr, ConditionCode code)
69{
70    switch (code)
71    {
72        case COND_EQ: return  cpsr.z;
73        case COND_NE: return !cpsr.z;
74        case COND_CS: return  cpsr.c;
75        case COND_CC: return !cpsr.c;
76        case COND_MI: return  cpsr.n;
77        case COND_PL: return !cpsr.n;
78        case COND_VS: return  cpsr.v;
79        case COND_VC: return !cpsr.v;
80        case COND_HI: return  (cpsr.c && !cpsr.z);
81        case COND_LS: return !(cpsr.c && !cpsr.z);
82        case COND_GE: return !(cpsr.n ^ cpsr.v);
83        case COND_LT: return  (cpsr.n ^ cpsr.v);
84        case COND_GT: return !(cpsr.n ^ cpsr.v || cpsr.z);
85        case COND_LE: return  (cpsr.n ^ cpsr.v || cpsr.z);
86        case COND_AL: return true;
87        case COND_UC: return true;
88        default:
89            panic("Unhandled predicate condition: %d\n", code);
90    }
91}
92
93/**
94 * Function to insure ISA semantics about 0 registers.
95 * @param tc The thread context.
96 */
97template <class TC>
98void zeroRegisters(TC *tc);
99
100inline void startupCPU(ThreadContext *tc, int cpuId)
101{
102    tc->activate(0);
103}
104
105void copyRegs(ThreadContext *src, ThreadContext *dest);
106
107static inline void
108copyMiscRegs(ThreadContext *src, ThreadContext *dest)
109{
110    panic("Copy Misc. Regs Not Implemented Yet\n");
111}
112
113void initCPU(ThreadContext *tc, int cpuId);
114
115static inline bool
116inUserMode(CPSR cpsr)
117{
118    return cpsr.mode == MODE_USER;
119}
120
121static inline bool
122inUserMode(ThreadContext *tc)
123{
124    return inUserMode(tc->readMiscRegNoEffect(MISCREG_CPSR));
125}
126
127static inline bool
128inPrivilegedMode(CPSR cpsr)
129{
130    return !inUserMode(cpsr);
131}
132
133static inline bool
134inPrivilegedMode(ThreadContext *tc)
135{
136    return !inUserMode(tc);
137}
138
139static inline bool
140vfpEnabled(CPACR cpacr, CPSR cpsr)
141{
142    return cpacr.cp10 == 0x3 ||
143        (cpacr.cp10 == 0x1 && inPrivilegedMode(cpsr));
144}
145
146static inline bool
147vfpEnabled(CPACR cpacr, CPSR cpsr, FPEXC fpexc)
148{
149    if ((cpacr.cp11 == 0x3) ||
150        ((cpacr.cp11 == 0x1) && inPrivilegedMode(cpsr)))
151        return fpexc.en && vfpEnabled(cpacr, cpsr);
152    else
153        return fpexc.en && vfpEnabled(cpacr, cpsr) &&
154            (cpacr.cp11 == cpacr.cp10);
155}
156
157static inline bool
158neonEnabled(CPACR cpacr, CPSR cpsr, FPEXC fpexc)
159{
160    return !cpacr.asedis && vfpEnabled(cpacr, cpsr, fpexc);
161}
162
163uint64_t getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp);
164
165void skipFunction(ThreadContext *tc);
166
167inline void
168advancePC(PCState &pc, const StaticInstPtr inst)
169{
170    inst->advancePC(pc);
171}
172
173Addr truncPage(Addr addr);
174Addr roundPage(Addr addr);
175
176};
177
178
179#endif
180