utility.hh revision 8829 
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(uint32_t nz, uint32_t c, uint32_t v, ConditionCode code)
69{
70    bool n = (nz & 0x2);
71    bool z = (nz & 0x1);
72
73    switch (code)
74    {
75        case COND_EQ: return  z;
76        case COND_NE: return !z;
77        case COND_CS: return  c;
78        case COND_CC: return !c;
79        case COND_MI: return  n;
80        case COND_PL: return !n;
81        case COND_VS: return  v;
82        case COND_VC: return !v;
83        case COND_HI: return  (c && !z);
84        case COND_LS: return !(c && !z);
85        case COND_GE: return !(n ^ v);
86        case COND_LT: return  (n ^ v);
87        case COND_GT: return !(n ^ v || z);
88        case COND_LE: return  (n ^ v || z);
89        case COND_AL: return true;
90        case COND_UC: return true;
91        default:
92            panic("Unhandled predicate condition: %d\n", code);
93    }
94}
95
96/**
97 * Function to insure ISA semantics about 0 registers.
98 * @param tc The thread context.
99 */
100template <class TC>
101void zeroRegisters(TC *tc);
102
103inline void startupCPU(ThreadContext *tc, int cpuId)
104{
105    tc->activate(0);
106}
107
108void copyRegs(ThreadContext *src, ThreadContext *dest);
109
110static inline void
111copyMiscRegs(ThreadContext *src, ThreadContext *dest)
112{
113    panic("Copy Misc. Regs Not Implemented Yet\n");
114}
115
116void initCPU(ThreadContext *tc, int cpuId);
117
118static inline bool
119inUserMode(CPSR cpsr)
120{
121    return cpsr.mode == MODE_USER;
122}
123
124static inline bool
125inUserMode(ThreadContext *tc)
126{
127    return inUserMode(tc->readMiscRegNoEffect(MISCREG_CPSR));
128}
129
130static inline bool
131inPrivilegedMode(CPSR cpsr)
132{
133    return !inUserMode(cpsr);
134}
135
136static inline bool
137inPrivilegedMode(ThreadContext *tc)
138{
139    return !inUserMode(tc);
140}
141
142static inline bool
143vfpEnabled(CPACR cpacr, CPSR cpsr)
144{
145    return cpacr.cp10 == 0x3 ||
146        (cpacr.cp10 == 0x1 && inPrivilegedMode(cpsr));
147}
148
149static inline bool
150vfpEnabled(CPACR cpacr, CPSR cpsr, FPEXC fpexc)
151{
152    if ((cpacr.cp11 == 0x3) ||
153        ((cpacr.cp11 == 0x1) && inPrivilegedMode(cpsr)))
154        return fpexc.en && vfpEnabled(cpacr, cpsr);
155    else
156        return fpexc.en && vfpEnabled(cpacr, cpsr) &&
157            (cpacr.cp11 == cpacr.cp10);
158}
159
160static inline bool
161neonEnabled(CPACR cpacr, CPSR cpsr, FPEXC fpexc)
162{
163    return !cpacr.asedis && vfpEnabled(cpacr, cpsr, fpexc);
164}
165
166uint64_t getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp);
167
168void skipFunction(ThreadContext *tc);
169
170inline void
171advancePC(PCState &pc, const StaticInstPtr inst)
172{
173    inst->advancePC(pc);
174}
175
176Addr truncPage(Addr addr);
177Addr roundPage(Addr addr);
178
179inline uint64_t
180getExecutingAsid(ThreadContext *tc)
181{
182    return tc->readMiscReg(MISCREG_CONTEXTIDR);
183}
184
185};
186
187#endif
188