1 files changed, 128 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/jit/ExecutableAllocator.cpp b/Source/JavaScriptCore/jit/ExecutableAllocator.cpp
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+++ b/Source/JavaScriptCore/jit/ExecutableAllocator.cpp
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+/*
+ * Copyright (C) 2008 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 "ExecutableAllocator.h"
+
+#if ENABLE(ASSEMBLER)
+
+namespace JSC {
+
+size_t ExecutableAllocator::pageSize = 0;
+
+#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND)
+
+void ExecutableAllocator::intializePageSize()
+{
+#if CPU(ARMV5_OR_LOWER)
+    // The moving memory model (as used in ARMv5 and earlier platforms)
+    // on Symbian OS limits the number of chunks for each process to 16. 
+    // To mitigate this limitation increase the pagesize to allocate
+    // fewer, larger chunks. Set the page size to 256 Kb to compensate
+    // for moving memory model limitation
+    ExecutableAllocator::pageSize = 256 * 1024;
+#else
+    ExecutableAllocator::pageSize = WTF::pageSize();
+#endif
+}
+
+ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t size)
+{
+    PageAllocation allocation = PageAllocation::allocate(size, OSAllocator::JSJITCodePages, EXECUTABLE_POOL_WRITABLE, true);
+    if (!allocation)
+        CRASH();
+    return allocation;
+}
+
+void ExecutablePool::systemRelease(ExecutablePool::Allocation& allocation)
+{
+    allocation.deallocate();
+}
+
+bool ExecutableAllocator::isValid() const
+{
+    return true;
+}
+    
+bool ExecutableAllocator::underMemoryPressure()
+{
+    return false;
+}
+    
+size_t ExecutableAllocator::committedByteCount()
+{
+    return 0;
+} 
+
+#endif
+
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+
+#if OS(WINDOWS) || OS(SYMBIAN)
+#error "ASSEMBLER_WX_EXCLUSIVE not yet suported on this platform."
+#endif
+
+void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting)
+{
+    if (!pageSize)
+        intializePageSize();
+
+    // Calculate the start of the page containing this region,
+    // and account for this extra memory within size.
+    intptr_t startPtr = reinterpret_cast<intptr_t>(start);
+    intptr_t pageStartPtr = startPtr & ~(pageSize - 1);
+    void* pageStart = reinterpret_cast<void*>(pageStartPtr);
+    size += (startPtr - pageStartPtr);
+
+    // Round size up
+    size += (pageSize - 1);
+    size &= ~(pageSize - 1);
+
+    mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX);
+}
+
+#endif
+
+#if CPU(ARM_TRADITIONAL) && OS(LINUX) && COMPILER(RVCT)
+
+__asm void ExecutableAllocator::cacheFlush(void* code, size_t size)
+{
+    ARM
+    push {r7}
+    add r1, r1, r0
+    mov r7, #0xf0000
+    add r7, r7, #0x2
+    mov r2, #0x0
+    svc #0x0
+    pop {r7}
+    bx lr
+}
+
+#endif
+
+}
+
+#endif // HAVE(ASSEMBLER)