44 lines
1.5 KiB
Go
44 lines
1.5 KiB
Go
package arm
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import (
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"git.urbach.dev/cli/q/src/cpu"
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)
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// MoveRegisterRegister copies a register to another register.
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func MoveRegisterRegister(destination cpu.Register, source cpu.Register) uint32 {
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if source == SP || destination == SP {
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return AddRegisterNumber(destination, source, 0)
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}
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return 0b10101010<<24 | reg3(destination, ZR, source)
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}
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// MoveRegisterNumber moves an integer into the given register.
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func MoveRegisterNumber(destination cpu.Register, number int) uint32 {
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if number < 0 {
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return MoveInvertedWideImmediate(destination, ^number)
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}
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return MoveZero(destination, 0, uint16(number))
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}
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// MoveInvertedWideImmediate moves an inverted 16-bit immediate value to a register.
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func MoveInvertedWideImmediate(destination cpu.Register, number int) uint32 {
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return 0b100100101<<23 | regImm(destination, number)
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}
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// MoveKeep moves a 16-bit integer into the given register and keeps all other bits.
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func MoveKeep(destination cpu.Register, halfword int, number uint16) uint32 {
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return mov(0b11, halfword, number, destination)
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}
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// MoveZero moves a 16-bit integer into the given register and clears all other bits to zero.
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func MoveZero(destination cpu.Register, halfword int, number uint16) uint32 {
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return mov(0b10, halfword, number, destination)
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}
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// mov encodes a generic move instruction.
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func mov(opCode uint32, halfword int, number uint16, destination cpu.Register) uint32 {
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return 1<<31 | opCode<<29 | 0b100101<<23 | uint32(halfword<<21) | uint32(number<<5) | uint32(destination)
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}
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