61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
package x64
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import (
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"encoding/binary"
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"git.akyoto.dev/cli/q/src/cpu"
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"git.akyoto.dev/cli/q/src/sizeof"
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)
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// MoveRegisterNumber moves an integer into the given register.
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func MoveRegisterNumber(code []byte, destination cpu.Register, number int) []byte {
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w := byte(0)
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if sizeof.Signed(int64(number)) == 8 {
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w = 1
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}
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if w == 0 && number < 0 {
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return MoveRegisterNumber32(code, destination, number)
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}
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b := byte(0)
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if destination > 0b111 {
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b = 1
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destination &= 0b111
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}
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if w != 0 || b != 0 {
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code = append(code, REX(w, 0, 0, b))
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}
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code = append(code, 0xB8+byte(destination))
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if w == 1 {
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return binary.LittleEndian.AppendUint64(code, uint64(number))
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} else {
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return binary.LittleEndian.AppendUint32(code, uint32(number))
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}
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}
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// MoveRegisterNumber32 moves an integer into the given register and sign-extends the register.
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func MoveRegisterNumber32(code []byte, destination cpu.Register, number int) []byte {
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b := byte(0)
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if destination > 0b111 {
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b = 1
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destination &= 0b111
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}
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code = append(code, REX(1, 0, 0, b))
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code = append(code, 0xC7)
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code = append(code, ModRM(AddressDirect, 0, byte(destination)))
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return binary.LittleEndian.AppendUint32(code, uint32(number))
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}
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// MoveRegisterRegister moves a register value into another register.
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func MoveRegisterRegister(code []byte, destination cpu.Register, source cpu.Register) []byte {
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return encode(code, AddressDirect, source, destination, 8, 0x89)
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}
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