Source/JavaScriptCore/assembler/MacroAssemblerARMv7.cpp

/*
 * Copyright (C) 2013-2015 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"

#if ENABLE(ASSEMBLER) && CPU(ARM_THUMB2)
#include "MacroAssemblerARMv7.h"

namespace JSC {

#if ENABLE(MASM_PROBE)

extern "C" void ctiMasmProbeTrampoline();

// For details on "What code is emitted for the probe?" and "What values are in
// the saved registers?", see comment for MacroAssemblerX86Common::probe() in
// MacroAssemblerX86Common.cpp.

void MacroAssemblerARMv7::probe(MacroAssemblerARMv7::ProbeFunction function, void* arg1, void* arg2)
{
    push(RegisterID::lr);
    push(RegisterID::lr);
    add32(TrustedImm32(8), RegisterID::sp, RegisterID::lr);
    store32(RegisterID::lr, ArmAddress(RegisterID::sp, 4));
    push(RegisterID::ip);
    push(RegisterID::r0);
    // The following uses RegisterID::ip. So, they must come after we push ip above.
    push(trustedImm32FromPtr(arg2));
    push(trustedImm32FromPtr(arg1));
    push(trustedImm32FromPtr(function));

    move(trustedImm32FromPtr(ctiMasmProbeTrampoline), RegisterID::ip);
    m_assembler.blx(RegisterID::ip);
}
#endif // ENABLE(MASM_PROBE)

} // namespace JSC

#endif // ENABLE(ASSEMBLER)