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/*
* Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#include "config.h"
#include "FTLSaveRestore.h"
#if ENABLE(FTL_JIT)
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "MacroAssembler.h"
#include "RegisterSet.h"
namespace JSC { namespace FTL {
static size_t bytesForGPRs()
{
return MacroAssembler::numberOfRegisters() * sizeof(int64_t);
}
static size_t bytesForFPRs()
{
// FIXME: It might be worthwhile saving the full state of the FP registers, at some point.
// Right now we don't need this since we only do the save/restore just prior to OSR exit, and
// OSR exit will be guaranteed to only need the double portion of the FP registers.
return MacroAssembler::numberOfFPRegisters() * sizeof(double);
}
size_t requiredScratchMemorySizeInBytes()
{
return bytesForGPRs() + bytesForFPRs();
}
size_t offsetOfGPR(GPRReg reg)
{
return MacroAssembler::registerIndex(reg) * sizeof(int64_t);
}
size_t offsetOfFPR(FPRReg reg)
{
return bytesForGPRs() + MacroAssembler::fpRegisterIndex(reg) * sizeof(double);
}
size_t offsetOfReg(Reg reg)
{
if (reg.isGPR())
return offsetOfGPR(reg.gpr());
return offsetOfFPR(reg.fpr());
}
namespace {
struct Regs {
Regs()
{
special = RegisterSet::stackRegisters();
special.merge(RegisterSet::reservedHardwareRegisters());
first = MacroAssembler::firstRegister();
while (special.get(first))
first = MacroAssembler::nextRegister(first);
second = MacroAssembler::nextRegister(first);
while (special.get(second))
second = MacroAssembler::nextRegister(second);
}
RegisterSet special;
GPRReg first;
GPRReg second;
};
} // anonymous namespace
void saveAllRegisters(MacroAssembler& jit, char* scratchMemory)
{
Regs regs;
// Get the first register out of the way, so that we can use it as a pointer.
jit.poke64(regs.first, 0);
jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), regs.first);
// Get all of the other GPRs out of the way.
for (MacroAssembler::RegisterID reg = regs.second; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.store64(reg, MacroAssembler::Address(regs.first, offsetOfGPR(reg)));
}
// Restore the first register into the second one and save it.
jit.peek64(regs.second, 0);
jit.store64(regs.second, MacroAssembler::Address(regs.first, offsetOfGPR(regs.first)));
// Finally save all FPR's.
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.storeDouble(reg, MacroAssembler::Address(regs.first, offsetOfFPR(reg)));
}
}
void restoreAllRegisters(MacroAssembler& jit, char* scratchMemory)
{
Regs regs;
// Give ourselves a pointer to the scratch memory.
jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), regs.first);
// Restore all FPR's.
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.loadDouble(MacroAssembler::Address(regs.first, offsetOfFPR(reg)), reg);
}
for (MacroAssembler::RegisterID reg = regs.second; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) {
if (regs.special.get(reg))
continue;
jit.load64(MacroAssembler::Address(regs.first, offsetOfGPR(reg)), reg);
}
jit.load64(MacroAssembler::Address(regs.first, offsetOfGPR(regs.first)), regs.first);
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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