JavaScriptCore-721.26.tar.gz

[apple/javascriptcore.git] / jit / ExecutableAllocator.cpp

diff --git a/jit/ExecutableAllocator.cpp b/jit/ExecutableAllocator.cpp
index f6b27ec2ab4ef2e3466b90ede62babde16b73116..5e10e863d49f6ddd899a33709c0540dfa94aa125 100644 (file)
--- a/jit/ExecutableAllocator.cpp
+++ b/jit/ExecutableAllocator.cpp
@@ -33,6 +33,42 @@ namespace JSC {
 
 size_t ExecutableAllocator::pageSize = 0;
 
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+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)