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feat(code): add instruction rewriter implementation

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boykopovar committed 2026-08-04 22:16:55 +03:00
1 parent 88fca26a28
commit 2ac8a96d70
3 files changed
+286
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core/codegen/include/codegen/x86/X64InstructionRewriter.hpp
+66
View File
@@ -2,6 +2,7 @@
#define CODEGEN_X86_X64INSTRUCTIONREWRITER_HPP
#include <codegen/IInstructionRewriter.hpp>
#include <cstdint>
namespace Codegen {
@@ -11,6 +12,71 @@ public:
const std::vector<std::uint8_t>& codeSection,
const RewriteRequest& request
) const override;
private:
enum class ReferenceKind {
None,
Rel8Branch,
Rel32Branch,
RipRelativeDisp32
};
struct ReferenceSite {
ReferenceKind Kind;
std::size_t FieldOffset;
};
static constexpr std::uint8_t OpcodePrefixLock = 0xF0;
static constexpr std::uint8_t OpcodePrefixRepne = 0xF2;
static constexpr std::uint8_t OpcodePrefixRep = 0xF3;
static constexpr std::uint8_t OpcodePrefixSegCs = 0x2E;
static constexpr std::uint8_t OpcodePrefixSegSs = 0x36;
static constexpr std::uint8_t OpcodePrefixSegDs = 0x3E;
static constexpr std::uint8_t OpcodePrefixSegEs = 0x26;
static constexpr std::uint8_t OpcodePrefixSegFs = 0x64;
static constexpr std::uint8_t OpcodePrefixSegGs = 0x65;
static constexpr std::uint8_t OpcodePrefixOperandSize = 0x66;
static constexpr std::uint8_t OpcodePrefixAddressSize = 0x67;
static constexpr std::uint8_t RexMin = 0x40;
static constexpr std::uint8_t RexMax = 0x4F;
static constexpr std::uint8_t TwoByteOpcodeEscape = 0x0F;
static constexpr std::uint8_t OpcodeCallRel32 = 0xE8;
static constexpr std::uint8_t OpcodeJmpRel32 = 0xE9;
static constexpr std::uint8_t OpcodeJmpRel8 = 0xEB;
static constexpr std::uint8_t OpcodeJccRel8Min = 0x70;
static constexpr std::uint8_t OpcodeJccRel8Max = 0x7F;
static constexpr std::uint8_t OpcodeJccRel32Min = 0x80;
static constexpr std::uint8_t OpcodeJccRel32Max = 0x8F;
static constexpr std::size_t Rel32InstructionLength = 5;
static constexpr std::size_t Rel8FieldSize = 1;
static constexpr std::size_t Rel32FieldSize = 4;
static constexpr std::size_t Disp32FieldSize = 4;
static constexpr std::uint8_t ModRmModShift = 6;
static constexpr std::uint8_t ModRmModMask = 0x03;
static constexpr std::uint8_t ModRmRmMask = 0x07;
static constexpr std::uint8_t ModRmModIndirect = 0x00;
static constexpr std::uint8_t ModRmRmRipRelative = 0x05;
[[nodiscard]] static ReferenceSite ClassifyInstruction(
const std::uint8_t* data,
std::size_t length
);
[[nodiscard]] static std::int32_t ReadInt32(const std::uint8_t* data);
static void WriteInt32(std::uint8_t* data, std::int32_t value);
[[nodiscard]] static std::int64_t AdjustedDelta(
std::int64_t instrPosition,
std::int64_t targetPosition,
std::int64_t cutStart,
std::int64_t delta
);
};
}