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diff --git a/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.cpp b/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.cpp
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+/*
+ * Copyright (C) 2013, 2014 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"
+
+#if ENABLE(ASSEMBLER) && (CPU(X86) || CPU(X86_64))
+#include "MacroAssemblerX86Common.h"
+
+namespace JSC {
+
+#if ENABLE(MASM_PROBE)
+
+#define INDENT printIndent(indentation)
+
+void MacroAssemblerX86Common::printCPURegisters(MacroAssemblerX86Common::CPUState& cpu, int indentation)
+{
+#if CPU(X86)
+    #define PRINT_GPREGISTER(_type, _regName) { \
+        int32_t value = reinterpret_cast<int32_t>(cpu._regName); \
+        INDENT, dataLogF("%6s: 0x%08x  %d\n", #_regName, value, value) ; \
+    }
+#elif CPU(X86_64)
+    #define PRINT_GPREGISTER(_type, _regName) { \
+        int64_t value = reinterpret_cast<int64_t>(cpu._regName); \
+        INDENT, dataLogF("%6s: 0x%016llx  %lld\n", #_regName, value, value) ; \
+    }
+#endif
+    FOR_EACH_CPU_GPREGISTER(PRINT_GPREGISTER)
+    FOR_EACH_CPU_SPECIAL_REGISTER(PRINT_GPREGISTER)
+    #undef PRINT_GPREGISTER
+
+    #define PRINT_FPREGISTER(_type, _regName) { \
+        uint64_t* u = reinterpret_cast<uint64_t*>(&cpu._regName); \
+        double* d = reinterpret_cast<double*>(&cpu._regName); \
+        INDENT, dataLogF("%6s: 0x%016llx  %.13g\n", #_regName, *u, *d); \
+    }
+    FOR_EACH_CPU_FPREGISTER(PRINT_FPREGISTER)
+    #undef PRINT_FPREGISTER
+}
+
+#undef INDENT
+
+void MacroAssemblerX86Common::printRegister(MacroAssemblerX86Common::CPUState& cpu, RegisterID regID)
+{
+    const char* name = CPUState::registerName(regID);
+    union {
+        void* voidPtr;
+        intptr_t intptrValue;
+    } u;
+    u.voidPtr = cpu.registerValue(regID);
+    dataLogF("%s:<%p %ld>", name, u.voidPtr, u.intptrValue);
+}
+
+void MacroAssemblerX86Common::printRegister(MacroAssemblerX86Common::CPUState& cpu, FPRegisterID regID)
+{
+    const char* name = CPUState::registerName(regID);
+    union {
+        double doubleValue;
+        uint64_t uint64Value;
+    } u;
+    u.doubleValue = cpu.registerValue(regID);
+    dataLogF("%s:<0x%016llx %.13g>", name, u.uint64Value, u.doubleValue);
+}
+
+extern "C" void ctiMasmProbeTrampoline();
+
+// What code is emitted for the probe?
+// ==================================
+// We want to keep the size of the emitted probe invocation code as compact as
+// possible to minimize the perturbation to the JIT generated code. However,
+// we also need to preserve the CPU registers and set up the ProbeContext to be
+// passed to the user probe function.
+//
+// Hence, we do only the minimum here to preserve a scratch register (i.e. rax
+// in this case) and the stack pointer (i.e. rsp), and pass the probe arguments.
+// We'll let the ctiMasmProbeTrampoline handle the rest of the probe invocation
+// work i.e. saving the CPUState (and setting up the ProbeContext), calling the
+// user probe function, and restoring the CPUState before returning to JIT
+// generated code.
+//
+// What registers need to be saved?
+// ===============================
+// The registers are saved for 2 reasons:
+// 1. To preserve their state in the JITted code. This means that all registers
+//    that are not callee saved needs to be saved. We also need to save the
+//    condition code registers because the probe can be inserted between a test
+//    and a branch.
+// 2. To allow the probe to inspect the values of the registers for debugging
+//    purposes. This means all registers need to be saved.
+//
+// In summary, save everything. But for reasons stated above, we should do the
+// minimum here and let ctiMasmProbeTrampoline do the heavy lifting to save the
+// full set.
+//
+// What values are in the saved registers?
+// ======================================
+// Conceptually, the saved registers should contain values as if the probe
+// is not present in the JIT generated code. Hence, they should contain values
+// that are expected at the start of the instruction immediately following the
+// probe.
+//
+// Specifically, the saved stack pointer register will point to the stack
+// position before we push the ProbeContext frame. The saved rip will point to
+// the address of the instruction immediately following the probe. 
+
+void MacroAssemblerX86Common::probe(MacroAssemblerX86Common::ProbeFunction function, void* arg1, void* arg2)
+{
+    push(RegisterID::esp);
+    push(RegisterID::eax);
+    move(TrustedImmPtr(arg2), RegisterID::eax);
+    push(RegisterID::eax);
+    move(TrustedImmPtr(arg1), RegisterID::eax);
+    push(RegisterID::eax);
+    move(TrustedImmPtr(reinterpret_cast<void*>(function)), RegisterID::eax);
+    push(RegisterID::eax);
+    move(TrustedImmPtr(reinterpret_cast<void*>(ctiMasmProbeTrampoline)), RegisterID::eax);
+    call(RegisterID::eax);
+}
+
+#endif // ENABLE(MASM_PROBE)
+
+#if CPU(X86) && !OS(MAC_OS_X)
+MacroAssemblerX86Common::SSE2CheckState MacroAssemblerX86Common::s_sse2CheckState = NotCheckedSSE2;
+#endif
+
+} // namespace JSC
+
+#endif // ENABLE(ASSEMBLER) && (CPU(X86) || CPU(X86_64))