| /* |
| * Copyright (C) 2017 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. |
| */ |
| |
| #pragma once |
| |
| #include "BExport.h" |
| #include "BPlatform.h" |
| #include <inttypes.h> |
| |
| // The Gigacage is 64GB. |
| #define GIGACAGE_MASK 0xfffffffffllu |
| #define GIGACAGE_SIZE (GIGACAGE_MASK + 1) |
| |
| // FIXME: Consider making this 32GB, in case unsigned 32-bit indices find their way into indexed accesses. |
| // https://bugs.webkit.org/show_bug.cgi?id=175062 |
| #define GIGACAGE_RUNWAY (16llu * 1024 * 1024 * 1024) |
| |
| #if BOS(DARWIN) && BCPU(X86_64) |
| #define GIGACAGE_ENABLED 1 |
| #else |
| #define GIGACAGE_ENABLED 0 |
| #endif |
| |
| extern "C" BEXPORT void* g_gigacageBasePtr; |
| |
| namespace Gigacage { |
| |
| BEXPORT void ensureGigacage(); |
| |
| BEXPORT void disableGigacage(); |
| |
| // This will call the disable callback immediately if the Gigacage is currently disabled. |
| BEXPORT void addDisableCallback(void (*)(void*), void*); |
| BEXPORT void removeDisableCallback(void (*)(void*), void*); |
| |
| template<typename T> |
| T* caged(T* ptr) |
| { |
| void* gigacageBasePtr = g_gigacageBasePtr; |
| if (!gigacageBasePtr) |
| return ptr; |
| return reinterpret_cast<T*>( |
| reinterpret_cast<uintptr_t>(gigacageBasePtr) + ( |
| reinterpret_cast<uintptr_t>(ptr) & static_cast<uintptr_t>(GIGACAGE_MASK))); |
| } |
| |
| inline bool isCaged(const void* ptr) |
| { |
| return caged(ptr) == ptr; |
| } |
| |
| BEXPORT bool shouldBeEnabled(); |
| |
| } // namespace Gigacage |
| |
| |
