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/*
* Copyright (C) 2013-2018 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 "Disassembler.h"
#if ENABLE(ZYDIS)
#include "AssemblyComments.h"
#include "MacroAssemblerCodeRef.h"
#include "Zydis.h"
#include <wtf/Compiler.h>
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
namespace JSC {
bool tryToDisassemble(const CodePtr<DisassemblyPtrTag>& codePtr, size_t size, void*, void*, const char* prefix, PrintStream& out)
{
ZydisDecoder decoder;
ZydisDecoderInit(&decoder, ZYDIS_MACHINE_MODE_LONG_64, ZYDIS_ADDRESS_WIDTH_64);
ZydisFormatter formatter;
ZydisFormatterInit(&formatter, ZYDIS_FORMATTER_STYLE_ATT);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_FORCE_SIZE, ZYAN_TRUE);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_HEX_UPPERCASE, ZYAN_FALSE);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_ADDR_PADDING_ABSOLUTE, ZYDIS_PADDING_DISABLED);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_ADDR_PADDING_RELATIVE, ZYDIS_PADDING_DISABLED);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_DISP_PADDING, ZYDIS_PADDING_DISABLED);
ZydisFormatterSetProperty(&formatter, ZYDIS_FORMATTER_PROP_IMM_PADDING, ZYDIS_PADDING_DISABLED);
const auto* data = codePtr.dataLocation<unsigned char*>();
ZyanUSize offset = 0;
ZydisDecodedInstruction instruction;
char formatted[1024];
while (ZYAN_SUCCESS(ZydisDecoderDecodeBuffer(&decoder, data + offset, size - offset, &instruction))) {
if (ZYAN_SUCCESS(ZydisFormatterFormatInstruction(&formatter, &instruction, formatted, sizeof(formatted), std::bit_cast<unsigned long long>(data + offset))))
out.printf("%s%#16llx: %s", prefix, static_cast<unsigned long long>(std::bit_cast<uintptr_t>(data + offset)), formatted);
else
out.printf("%s%#16llx: failed-to-format", prefix, static_cast<unsigned long long>(std::bit_cast<uintptr_t>(data + offset)));
if (auto str = AssemblyCommentRegistry::singleton().comment(reinterpret_cast<void*>(std::bit_cast<uintptr_t>(data + offset))))
out.printf("; %s\n", str->ascii().data());
else
out.printf("\n");
offset += instruction.length;
}
return true;
}
} // namespace JSC
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
#endif // ENABLE(ZYDIS)
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