19 lines
No EOL
550 B
Go
19 lines
No EOL
550 B
Go
package x86
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// AddressMode encodes the addressing mode.
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type AddressMode = byte
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const (
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AddressMemory = AddressMode(0b00)
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AddressMemoryOffset8 = AddressMode(0b01)
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AddressMemoryOffset32 = AddressMode(0b10)
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AddressDirect = AddressMode(0b11)
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)
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// ModRM is used to generate a mode-register-memory suffix.
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// - mod: 2 bits. The addressing mode.
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// - reg: 3 bits. Register reference or opcode extension.
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// - rm: 3 bits. Register operand.
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func ModRM(mod AddressMode, reg byte, rm byte) byte {
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return (mod << 6) | (reg << 3) | rm
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} |