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/*
* Copyright (C) 2017-2021 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 "WasmThunks.h"
#if ENABLE(WEBASSEMBLY)
#include "AllowMacroScratchRegisterUsage.h"
#include "CCallHelpers.h"
#include "JSInterfaceJIT.h"
#include "LinkBuffer.h"
#include "ProbeContext.h"
#include "ScratchRegisterAllocator.h"
#include "WasmExceptionType.h"
#include "WasmInstance.h"
#include "WasmOperations.h"
namespace JSC { namespace Wasm {
MacroAssemblerCodeRef<JITThunkPtrTag> throwExceptionFromWasmThunkGenerator(const AbstractLocker&)
{
CCallHelpers jit;
JIT_COMMENT(jit, "throwExceptionFromWasmThunkGenerator");
// The thing that jumps here must move ExceptionType into the argumentGPR1 before jumping here.
// We're allowed to use temp registers here. We are not allowed to use callee saves.
jit.move(GPRInfo::wasmContextInstancePointer, GPRInfo::argumentGPR0);
jit.loadPtr(CCallHelpers::Address(GPRInfo::argumentGPR0, Instance::offsetOfVM()), GPRInfo::argumentGPR2);
jit.loadPtr(CCallHelpers::Address(GPRInfo::argumentGPR2, VM::topEntryFrameOffset()), GPRInfo::argumentGPR2);
jit.copyCalleeSavesToEntryFrameCalleeSavesBuffer(GPRInfo::argumentGPR2);
jit.prepareWasmCallOperation(GPRInfo::argumentGPR0);
CCallHelpers::Call call = jit.call(OperationPtrTag);
jit.farJump(GPRInfo::returnValueGPR, ExceptionHandlerPtrTag);
jit.breakpoint(); // We should not reach this.
LinkBuffer linkBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::WasmThunk);
linkBuffer.link<OperationPtrTag>(call, operationWasmToJSException);
return FINALIZE_WASM_CODE(linkBuffer, JITThunkPtrTag, "Throw exception from Wasm");
}
MacroAssemblerCodeRef<JITThunkPtrTag> throwStackOverflowFromWasmThunkGenerator(const AbstractLocker& locker)
{
CCallHelpers jit;
JIT_COMMENT(jit, "throwStackOverflowFromWasmThunkGenerator");
int32_t stackSpace = WTF::roundUpToMultipleOf(stackAlignmentBytes(), RegisterSetBuilder::calleeSaveRegisters().numberOfSetRegisters() * sizeof(Register));
ASSERT(static_cast<unsigned>(stackSpace) < Options::softReservedZoneSize());
jit.addPtr(CCallHelpers::TrustedImm32(-stackSpace), GPRInfo::callFrameRegister, MacroAssembler::stackPointerRegister);
jit.move(CCallHelpers::TrustedImm32(static_cast<uint32_t>(ExceptionType::StackOverflow)), GPRInfo::argumentGPR1);
auto jumpToExceptionHandler = jit.jump();
LinkBuffer linkBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::WasmThunk);
linkBuffer.link(jumpToExceptionHandler, CodeLocationLabel<JITThunkPtrTag>(Thunks::singleton().stub(locker, throwExceptionFromWasmThunkGenerator).code()));
return FINALIZE_WASM_CODE(linkBuffer, JITThunkPtrTag, "Throw stack overflow from Wasm");
}
#if USE(JSVALUE64)
MacroAssemblerCodeRef<JITThunkPtrTag> catchInWasmThunkGenerator(const AbstractLocker&)
{
CCallHelpers jit;
JIT_COMMENT(jit, "catch runway");
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::callee), GPRInfo::regT0);
jit.move(GPRInfo::regT0, GPRInfo::regT3);
jit.and64(CCallHelpers::TrustedImm64(JSValue::WasmMask), GPRInfo::regT3);
auto isWasmCallee = jit.branch64(CCallHelpers::Equal, GPRInfo::regT3, CCallHelpers::TrustedImm32(JSValue::WasmTag));
CCallHelpers::JumpList doneCases;
{
// FIXME: Handling precise allocations in WasmB3IRGenerator catch entrypoints might be unnecessary
// https://bugs.webkit.org/show_bug.cgi?id=231213
auto preciseAllocationCase = jit.branchTestPtr(CCallHelpers::NonZero, GPRInfo::regT0, CCallHelpers::TrustedImm32(PreciseAllocation::halfAlignment));
jit.andPtr(CCallHelpers::TrustedImmPtr(MarkedBlock::blockMask), GPRInfo::regT0);
jit.loadPtr(CCallHelpers::Address(GPRInfo::regT0, MarkedBlock::offsetOfHeader + MarkedBlock::Header::offsetOfVM()), GPRInfo::regT0);
doneCases.append(jit.jump());
preciseAllocationCase.link(&jit);
jit.loadPtr(CCallHelpers::Address(GPRInfo::regT0, PreciseAllocation::offsetOfWeakSet() + WeakSet::offsetOfVM() - PreciseAllocation::headerSize()), GPRInfo::regT0);
doneCases.append(jit.jump());
}
isWasmCallee.link(&jit);
jit.loadPtr(CCallHelpers::addressFor(CallFrameSlot::codeBlock), GPRInfo::regT0);
jit.loadPtr(CCallHelpers::Address(GPRInfo::regT0, Instance::offsetOfVM()), GPRInfo::regT0);
doneCases.link(&jit);
JIT_COMMENT(jit, "restore callee saves from vm entry buffer");
jit.restoreCalleeSavesFromVMEntryFrameCalleeSavesBuffer(GPRInfo::regT0, GPRInfo::regT3);
jit.loadPtr(CCallHelpers::Address(GPRInfo::regT0, VM::callFrameForCatchOffset()), GPRInfo::callFrameRegister);
JIT_COMMENT(jit, "Configure wasm context instance");
jit.loadPtr(CCallHelpers::Address(GPRInfo::callFrameRegister, CallFrameSlot::codeBlock * sizeof(Register)), GPRInfo::wasmContextInstancePointer);
// So, this is calling a function. This means that we clobber all caller-save registers!
// Is it safe? Yes. OMG / BBQ(Air) generates stackmap for values with the patchpoint which says "this is function call". Thus, stackmap must hold
// StackSlots / Registers which are not these caller-save registers. So, clobbering these registers here does not break the stackmap restoration.
jit.prepareWasmCallOperation(GPRInfo::wasmContextInstancePointer);
jit.setupArguments<decltype(operationWasmRetrieveAndClearExceptionIfCatchable)>(GPRInfo::wasmContextInstancePointer);
jit.callOperation(operationWasmRetrieveAndClearExceptionIfCatchable);
static_assert(noOverlap(GPRInfo::nonPreservedNonArgumentGPR0, GPRInfo::returnValueGPR, GPRInfo::returnValueGPR2));
jit.farJump(GPRInfo::returnValueGPR2, ExceptionHandlerPtrTag);
LinkBuffer linkBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::WasmThunk);
return FINALIZE_WASM_CODE(linkBuffer, JITThunkPtrTag, "Wasm catch runway");
}
#endif
#if ENABLE(WEBASSEMBLY_B3JIT)
MacroAssemblerCodeRef<JITThunkPtrTag> triggerOMGEntryTierUpThunkGeneratorImpl(const AbstractLocker&, bool isSIMDContext)
{
// We expect that the user has already put the function index into GPRInfo::nonPreservedNonArgumentGPR0
CCallHelpers jit;
JIT_COMMENT(jit, "triggerOMGEntryTierUpThunkGenerator");
jit.emitFunctionPrologue();
const unsigned extraPaddingBytes = 0;
auto registersToSpill = RegisterSetBuilder::registersToSaveForCCall(isSIMDContext ? RegisterSetBuilder::allRegisters() : RegisterSetBuilder::allScalarRegisters()).buildWithLowerBits();
unsigned numberOfStackBytesUsedForRegisterPreservation = ScratchRegisterAllocator::preserveRegistersToStackForCall(jit, registersToSpill, extraPaddingBytes);
// We can clobber these argument registers now since we saved them and later we restore them.
jit.move(GPRInfo::wasmContextInstancePointer, GPRInfo::argumentGPR0);
jit.move(GPRInfo::nonPreservedNonArgumentGPR0, GPRInfo::argumentGPR1);
jit.move(MacroAssembler::TrustedImmPtr(tagCFunction<OperationPtrTag>(operationWasmTriggerTierUpNow)), GPRInfo::argumentGPR2);
jit.call(GPRInfo::argumentGPR2, OperationPtrTag);
ScratchRegisterAllocator::restoreRegistersFromStackForCall(jit, registersToSpill, { }, numberOfStackBytesUsedForRegisterPreservation, extraPaddingBytes);
jit.emitFunctionEpilogue();
jit.ret();
LinkBuffer linkBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::WasmThunk);
return FINALIZE_WASM_CODE(linkBuffer, JITThunkPtrTag, "Trigger OMG entry tier up");
}
MacroAssemblerCodeRef<JITThunkPtrTag> triggerOMGEntryTierUpThunkGeneratorSIMD(const AbstractLocker& locker)
{
return triggerOMGEntryTierUpThunkGeneratorImpl(locker, true);
}
MacroAssemblerCodeRef<JITThunkPtrTag> triggerOMGEntryTierUpThunkGeneratorNoSIMD(const AbstractLocker& locker)
{
return triggerOMGEntryTierUpThunkGeneratorImpl(locker, false);
}
#endif
static Thunks* thunks;
void Thunks::initialize()
{
thunks = new Thunks;
}
Thunks& Thunks::singleton()
{
ASSERT(thunks);
return *thunks;
}
MacroAssemblerCodeRef<JITThunkPtrTag> Thunks::stub(ThunkGenerator generator)
{
Locker locker { m_lock };
return stub(locker, generator);
}
MacroAssemblerCodeRef<JITThunkPtrTag> Thunks::stub(const AbstractLocker& locker, ThunkGenerator generator)
{
ASSERT(!!generator);
{
auto addResult = m_stubs.add(generator, MacroAssemblerCodeRef<JITThunkPtrTag>());
if (!addResult.isNewEntry)
return addResult.iterator->value;
}
MacroAssemblerCodeRef<JITThunkPtrTag> code = generator(locker);
// We specifically don't use the iterator here to allow generator to recursively change m_stubs.
m_stubs.set(generator, code);
return code;
}
MacroAssemblerCodeRef<JITThunkPtrTag> Thunks::existingStub(ThunkGenerator generator)
{
Locker locker { m_lock };
auto iter = m_stubs.find(generator);
if (iter != m_stubs.end())
return iter->value;
return MacroAssemblerCodeRef<JITThunkPtrTag>();
}
} } // namespace JSC::Wasm
#endif // ENABLE(WEBASSEMBLY)
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