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2ae228dac7
Most of the 64-bit instructions default to 32-bit operands and select 64-bit using REX.W prefixes. Because of that instead of defining new instruction formats, this reuses the 32-bit formats and changes them to take the REX prefixes into account when necessary. Additionally this removes, adds or modifies the instruction descriptors in the 64-bit table, where they are different from 32-bit. Using 'disasm' these changes seem to cover pretty much all of our 64-bit binaries (except for AVX) :^) Note that UserspaceEmulator will need to account for these prefixed versions in its 32-bit instruction handlers before being usable on x86-64.
41 lines
793 B
C++
41 lines
793 B
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Optional.h>
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#include <LibX86/Instruction.h>
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namespace X86 {
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class Disassembler {
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public:
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explicit Disassembler(InstructionStream& stream)
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: m_stream(stream)
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{
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}
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Optional<Instruction> next()
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{
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if (!m_stream.can_read())
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return {};
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#if ARCH(I386)
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return Instruction::from_stream(m_stream, OperandSize::Size32, AddressSize::Size32);
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#else
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# if ARCH(X86_64)
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return Instruction::from_stream(m_stream, OperandSize::Size32, AddressSize::Size64);
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# else
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dbgln("Unsupported platform");
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return {};
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# endif
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#endif
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}
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private:
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InstructionStream& m_stream;
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};
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}
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