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/*
* Copyright (C) 2013-2021 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 "AssemblyHelpersSpoolers.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "Reg.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 = RegisterSetBuilder::stackRegisters();
special.merge(RegisterSetBuilder::reservedHardwareRegisters());
first = MacroAssembler::firstRegister();
while (special.contains(first, IgnoreVectors))
first = MacroAssembler::nextRegister(first);
}
GPRReg nextRegister(GPRReg current)
{
auto next = MacroAssembler::nextRegister(current);
for (; next <= MacroAssembler::lastRegister(); next = MacroAssembler::nextRegister(next)) {
if (!special.contains(next, IgnoreVectors))
break;
}
return next;
}
RegisterSet special;
GPRReg first;
};
} // anonymous namespace
void saveAllRegisters(AssemblyHelpers& jit, char* scratchMemory)
{
Regs regs;
// Get the first register out of the way, so that we can use it as a pointer.
GPRReg baseGPR = regs.first;
#if CPU(ARM64)
GPRReg nextGPR = regs.nextRegister(baseGPR);
GPRReg firstToSaveGPR = regs.nextRegister(nextGPR);
ASSERT(baseGPR == ARM64Registers::x0);
ASSERT(nextGPR == ARM64Registers::x1);
#else
GPRReg firstToSaveGPR = regs.nextRegister(baseGPR);
#endif
jit.poke64(baseGPR, 0);
jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), baseGPR);
AssemblyHelpers::StoreRegSpooler spooler(jit, baseGPR);
// Get all of the other GPRs out of the way.
for (MacroAssembler::RegisterID reg = firstToSaveGPR; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) {
if (regs.special.contains(reg, IgnoreVectors))
continue;
spooler.storeGPR({ reg, static_cast<ptrdiff_t>(offsetOfGPR(reg)), conservativeWidthWithoutVectors(reg) });
}
spooler.finalizeGPR();
// Restore the first register into the second one and save it.
jit.peek64(firstToSaveGPR, 0);
#if CPU(ARM64)
jit.storePair64(firstToSaveGPR, nextGPR, baseGPR, AssemblyHelpers::TrustedImm32(offsetOfGPR(baseGPR)));
#else
jit.store64(firstToSaveGPR, MacroAssembler::Address(baseGPR, offsetOfGPR(baseGPR)));
#endif
// Finally save all FPR's.
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) {
if (regs.special.contains(reg, IgnoreVectors))
continue;
spooler.storeFPR({ reg, static_cast<ptrdiff_t>(offsetOfFPR(reg)), conservativeWidthWithoutVectors(reg) });
}
spooler.finalizeFPR();
}
void restoreAllRegisters(AssemblyHelpers& jit, char* scratchMemory)
{
Regs regs;
// Give ourselves a pointer to the scratch memory.
GPRReg baseGPR = regs.first;
jit.move(MacroAssembler::TrustedImmPtr(scratchMemory), baseGPR);
AssemblyHelpers::LoadRegSpooler spooler(jit, baseGPR);
// Restore all FPR's.
for (MacroAssembler::FPRegisterID reg = MacroAssembler::firstFPRegister(); reg <= MacroAssembler::lastFPRegister(); reg = MacroAssembler::nextFPRegister(reg)) {
if (regs.special.contains(reg, IgnoreVectors))
continue;
spooler.loadFPR({ reg, static_cast<ptrdiff_t>(offsetOfFPR(reg)), conservativeWidthWithoutVectors(reg) });
}
spooler.finalizeFPR();
#if CPU(ARM64)
GPRReg nextGPR = regs.nextRegister(baseGPR);
GPRReg firstToRestoreGPR = regs.nextRegister(nextGPR);
ASSERT(baseGPR == ARM64Registers::x0);
ASSERT(nextGPR == ARM64Registers::x1);
#else
GPRReg firstToRestoreGPR = regs.nextRegister(baseGPR);
#endif
for (MacroAssembler::RegisterID reg = firstToRestoreGPR; reg <= MacroAssembler::lastRegister(); reg = MacroAssembler::nextRegister(reg)) {
if (regs.special.contains(reg, IgnoreVectors))
continue;
spooler.loadGPR({ reg, static_cast<ptrdiff_t>(offsetOfGPR(reg)), conservativeWidthWithoutVectors(reg) });
}
spooler.finalizeGPR();
#if CPU(ARM64)
jit.loadPair64(baseGPR, AssemblyHelpers::TrustedImm32(offsetOfGPR(baseGPR)), baseGPR, nextGPR);
#else
jit.load64(MacroAssembler::Address(baseGPR, offsetOfGPR(baseGPR)), baseGPR);
#endif
}
} } // namespace JSC::FTL
#endif // ENABLE(FTL_JIT)
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