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/*
* Copyright (c) 2009-2010 ARM Limited
* All rights reserved.
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
*/
#include "arch/arm/faults.hh"
#include "arch/arm/isa_traits.hh"
#include "arch/arm/utility.hh"
#include "cpu/thread_context.hh"
#if FULL_SYSTEM
#include "arch/arm/vtophys.hh"
#include "mem/vport.hh"
#endif
#include "arch/arm/tlb.hh"
namespace ArmISA {
void
initCPU(ThreadContext *tc, int cpuId)
{
// Reset CP15?? What does that mean -- ali
// FPEXC.EN = 0
static Fault reset = new Reset;
if (cpuId == 0)
reset->invoke(tc);
}
uint64_t
getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp)
{
#if FULL_SYSTEM
if (size == (uint16_t)(-1))
size = ArmISA::MachineBytes;
if (fp)
panic("getArgument(): Floating point arguments not implemented\n");
if (number < NumArgumentRegs) {
// If the argument is 64 bits, it must be in an even regiser number
// Increment the number here if it isn't even
if (size == sizeof(uint64_t)) {
if ((number % 2) != 0)
number++;
// Read the two halves of the data
// number is inc here to get the second half of the 64 bit reg
uint64_t tmp;
tmp = tc->readIntReg(number++);
tmp |= tc->readIntReg(number) << 32;
return tmp;
} else {
return tc->readIntReg(number);
}
} else {
Addr sp = tc->readIntReg(StackPointerReg);
VirtualPort *vp = tc->getVirtPort();
uint64_t arg;
if (size == sizeof(uint64_t)) {
// If the argument is even it must be aligned
if ((number % 2) != 0)
number++;
arg = vp->read<uint64_t>(sp +
(number-NumArgumentRegs) * sizeof(uint32_t));
// since two 32 bit args == 1 64 bit arg, increment number
number++;
} else {
arg = vp->read<uint32_t>(sp +
(number-NumArgumentRegs) * sizeof(uint32_t));
}
return arg;
}
#else
panic("getArgument() only implemented for FULL_SYSTEM\n");
M5_DUMMY_RETURN
#endif
}
void
skipFunction(ThreadContext *tc)
{
TheISA::PCState newPC = tc->pcState();
newPC.set(tc->readIntReg(ReturnAddressReg) & ~ULL(1));
tc->pcState(newPC);
}
void
copyRegs(ThreadContext *src, ThreadContext *dest)
{
int i;
int saved_mode = ((CPSR)src->readMiscReg(MISCREG_CPSR)).mode;
// Make sure we're in user mode, so we can easily see all the registers
// in the copy loop
src->setMiscReg(MISCREG_CPSR_MODE, MODE_USER);
dest->setMiscReg(MISCREG_CPSR_MODE, MODE_USER);
for(i = 0; i < TheISA::NumIntRegs; i++)
dest->setIntReg(i, src->readIntReg(i));
// Restore us back to the old mode
src->setMiscReg(MISCREG_CPSR_MODE, saved_mode);
dest->setMiscReg(MISCREG_CPSR_MODE, saved_mode);
for(i = 0; i < TheISA::NumFloatRegs; i++)
dest->setFloatReg(i, src->readFloatReg(i));
for(i = 0; i < TheISA::NumMiscRegs; i++)
dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i));
// setMiscReg "with effect" will set the misc register mapping correctly.
// e.g. updateRegMap(val)
dest->setMiscReg(MISCREG_CPSR, src->readMiscRegNoEffect(MISCREG_CPSR));
// Copy over the PC State
dest->pcState(src->pcState());
// Invalidate the tlb misc register cache
dest->getITBPtr()->invalidateMiscReg();
dest->getDTBPtr()->invalidateMiscReg();
}
Addr
truncPage(Addr addr)
{
return addr & ~(PageBytes - 1);
}
Addr
roundPage(Addr addr)
{
return (addr + PageBytes - 1) & ~(PageBytes - 1);
}
} // namespace ArmISA
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