utility.cc revision 8208:45331a355c38 
1/*
2 * Copyright (c) 2009-2010 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 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Ali Saidi
38 */
39
40
41#include "arch/arm/faults.hh"
42#include "arch/arm/isa_traits.hh"
43#include "arch/arm/utility.hh"
44#include "cpu/thread_context.hh"
45
46#if FULL_SYSTEM
47#include "arch/arm/vtophys.hh"
48#include "mem/vport.hh"
49#endif
50
51#include "arch/arm/tlb.hh"
52
53namespace ArmISA {
54
55void
56initCPU(ThreadContext *tc, int cpuId)
57{
58    // Reset CP15?? What does that mean -- ali
59
60    // FPEXC.EN = 0
61
62    static Fault reset = new Reset;
63    if (cpuId == 0)
64        reset->invoke(tc);
65}
66
67uint64_t
68getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp)
69{
70#if FULL_SYSTEM
71    if (size == (uint16_t)(-1))
72        size = ArmISA::MachineBytes;
73    if (fp)
74        panic("getArgument(): Floating point arguments not implemented\n");
75
76    if (number < NumArgumentRegs) {
77        // If the argument is 64 bits, it must be in an even regiser number
78        // Increment the number here if it isn't even
79        if (size == sizeof(uint64_t)) {
80            if ((number % 2) != 0)
81                number++;
82            // Read the two halves of the data
83            // number is inc here to get the second half of the 64 bit reg
84            uint64_t tmp;
85            tmp = tc->readIntReg(number++);
86            tmp |= tc->readIntReg(number) << 32;
87            return tmp;
88        } else {
89           return tc->readIntReg(number);
90        }
91    } else {
92        Addr sp = tc->readIntReg(StackPointerReg);
93        VirtualPort *vp = tc->getVirtPort();
94        uint64_t arg;
95        if (size == sizeof(uint64_t)) {
96            // If the argument is even it must be aligned
97            if ((number % 2) != 0)
98                number++;
99            arg = vp->read<uint64_t>(sp +
100                    (number-NumArgumentRegs) * sizeof(uint32_t));
101            // since two 32 bit args == 1 64 bit arg, increment number
102            number++;
103        } else {
104            arg = vp->read<uint32_t>(sp +
105                           (number-NumArgumentRegs) * sizeof(uint32_t));
106        }
107        return arg;
108    }
109#else
110    panic("getArgument() only implemented for FULL_SYSTEM\n");
111    M5_DUMMY_RETURN
112#endif
113}
114
115void
116skipFunction(ThreadContext *tc)
117{
118    TheISA::PCState newPC = tc->pcState();
119    newPC.set(tc->readIntReg(ReturnAddressReg) & ~ULL(1));
120    tc->pcState(newPC);
121}
122
123void
124copyRegs(ThreadContext *src, ThreadContext *dest)
125{
126    int i;
127
128    int saved_mode = ((CPSR)src->readMiscReg(MISCREG_CPSR)).mode;
129
130    // Make sure we're in user mode, so we can easily see all the registers
131    // in the copy loop
132    src->setMiscReg(MISCREG_CPSR_MODE, MODE_USER);
133    dest->setMiscReg(MISCREG_CPSR_MODE, MODE_USER);
134
135    for(i = 0; i < TheISA::NumIntRegs; i++)
136        dest->setIntReg(i, src->readIntReg(i));
137
138    // Restore us back to the old mode
139    src->setMiscReg(MISCREG_CPSR_MODE, saved_mode);
140    dest->setMiscReg(MISCREG_CPSR_MODE, saved_mode);
141
142    for(i = 0; i < TheISA::NumFloatRegs; i++)
143        dest->setFloatReg(i, src->readFloatReg(i));
144    for(i = 0; i < TheISA::NumMiscRegs; i++)
145        dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i));
146
147    // setMiscReg "with effect" will set the misc register mapping correctly.
148    // e.g. updateRegMap(val)
149    dest->setMiscReg(MISCREG_CPSR, src->readMiscRegNoEffect(MISCREG_CPSR));
150
151    // Copy over the PC State
152    dest->pcState(src->pcState());
153
154    // Invalidate the tlb misc register cache
155    dest->getITBPtr()->invalidateMiscReg();
156    dest->getDTBPtr()->invalidateMiscReg();
157}
158
159Addr
160truncPage(Addr addr)
161{
162    return addr & ~(PageBytes - 1);
163}
164
165Addr
166roundPage(Addr addr)
167{
168    return (addr + PageBytes - 1) & ~(PageBytes - 1);
169}
170
171} // namespace ArmISA
172