mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
/*
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* Copyright (C) 2017 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "ProbeContext.h"
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#if ENABLE(MASM_PROBE)
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namespace JSC {
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namespace Probe {
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static void flushDirtyStackPages(State*);
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void executeProbe(State* state)
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{
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Context context(state);
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#if CPU(ARM64)
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auto& cpu = context.cpu;
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void* originalLR = cpu.gpr<void*>(ARM64Registers::lr);
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void* originalPC = cpu.pc();
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#elif CPU(MIPS)
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auto& cpu = context.cpu;
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void* originalRA = cpu.gpr<void*>(MIPSRegisters::ra);
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void* originalPC = cpu.pc();
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#endif
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state->initializeStackFunction = nullptr;
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state->initializeStackArg = nullptr;
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state->probeFunction(context);
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#if CPU(ARM64)
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// The ARM64 probe trampoline does not support changing both lr and pc.
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RELEASE_ASSERT(originalPC == cpu.pc() || originalLR == cpu.gpr<void*>(ARM64Registers::lr));
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#elif CPU(MIPS)
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// The MIPS probe trampoline does not support changing both ra and pc.
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RELEASE_ASSERT(originalPC == cpu.pc() || originalRA == cpu.gpr<void*>(MIPSRegisters::ra));
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#endif
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if (context.hasWritesToFlush()) {
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context.stack().setSavedStackPointer(state->cpu.sp());
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void* lowWatermark = context.stack().lowWatermarkFromVisitingDirtyPages();
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state->cpu.sp() = std::min(lowWatermark, state->cpu.sp());
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state->initializeStackFunction = flushDirtyStackPages;
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state->initializeStackArg = context.releaseStack();
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}
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}
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static void flushDirtyStackPages(State* state)
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{
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std::unique_ptr<Stack> stack(reinterpret_cast<Probe::Stack*>(state->initializeStackArg));
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stack->flushWrites();
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state->cpu.sp() = stack->savedStackPointer();
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}
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// Not for general use. This should only be for writing tests.
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JS_EXPORT_PRIVATE void* probeStateForContext(Context&);
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void* probeStateForContext(Context& context)
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{
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return context.m_state;
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}
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} // namespace Probe
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} // namespace JSC
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#endif // ENABLE(MASM_PROBE)
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