cli/q
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Improved x64 encoder

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This commit is contained in:
Eduard Urbach 2024-07-20 00:58:39 +02:00
parent 7490a32666
commit 6b5dd4c687
Signed by: akyoto
GPG Key ID: C874F672B1AF20C0
15 changed files with 317 additions and 53 deletions
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4
src/build/arch/x64/Add.go
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@ -6,10 +6,10 @@ import (
// AddRegisterNumber adds a number to the given register. // AddRegisterNumber adds a number to the given register.
func AddRegisterNumber(code []byte, destination cpu.Register, number int) []byte { func AddRegisterNumber(code []byte, destination cpu.Register, number int) []byte {
return regRegNum(code, 0, byte(destination), number, 0x83, 0x81) return encodeNum(code, 1, AddressDirect, 0, byte(destination), number, 0x83, 0x81)
} }
// AddRegisterRegister adds a register value into another register. // AddRegisterRegister adds a register value into another register.
func AddRegisterRegister(code []byte, destination cpu.Register, operand cpu.Register) []byte { func AddRegisterRegister(code []byte, destination cpu.Register, operand cpu.Register) []byte {
return regReg(code, byte(operand), byte(destination), 0x01) return encode(code, 1, AddressDirect, byte(operand), byte(destination), 0x01)
} }

4
src/build/arch/x64/Compare.go
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@ -4,10 +4,10 @@ import "git.akyoto.dev/cli/q/src/build/cpu"
// Compares the register with the number and sets the status flags in the EFLAGS register. // Compares the register with the number and sets the status flags in the EFLAGS register.
func CompareRegisterNumber(code []byte, register cpu.Register, number int) []byte { func CompareRegisterNumber(code []byte, register cpu.Register, number int) []byte {
return regRegNum(code, 0b111, byte(register), number, 0x83, 0x81) return encodeNum(code, 1, AddressDirect, 0b111, byte(register), number, 0x83, 0x81)
} }
// CompareRegisterRegister compares a register with a register and sets the status flags in the EFLAGS register. // CompareRegisterRegister compares a register with a register and sets the status flags in the EFLAGS register.
func CompareRegisterRegister(code []byte, registerA cpu.Register, registerB cpu.Register) []byte { func CompareRegisterRegister(code []byte, registerA cpu.Register, registerB cpu.Register) []byte {
return regReg(code, byte(registerB), byte(registerA), 0x39) return encode(code, 1, AddressDirect, byte(registerB), byte(registerA), 0x39)
} }

7
src/build/arch/x64/ModRM.go
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@ -1,5 +1,12 @@
package x64 package x64
const (
AddressMemory = byte(0b00)
AddressMemoryOffset8 = byte(0b01)
AddressMemoryOffset32 = byte(0b10)
AddressDirect = byte(0b11)
)
// ModRM is used to generate a ModRM suffix. // ModRM is used to generate a ModRM suffix.
// - mod: 2 bits // - mod: 2 bits
// - reg: 3 bits // - reg: 3 bits

2
src/build/arch/x64/Move.go
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@ -19,5 +19,5 @@ func MoveRegisterNumber32(code []byte, destination cpu.Register, number uint32)
// MoveRegisterRegister64 moves a register value into another register. // MoveRegisterRegister64 moves a register value into another register.
func MoveRegisterRegister64(code []byte, destination cpu.Register, source cpu.Register) []byte { func MoveRegisterRegister64(code []byte, destination cpu.Register, source cpu.Register) []byte {
return regReg(code, byte(source), byte(destination), 0x89) return encode(code, 1, AddressDirect, byte(source), byte(destination), 0x89)
} }

4
src/build/arch/x64/Mul.go
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@ -4,10 +4,10 @@ import "git.akyoto.dev/cli/q/src/build/cpu"
// MulRegisterNumber multiplies a register with a number. // MulRegisterNumber multiplies a register with a number.
func MulRegisterNumber(code []byte, destination cpu.Register, number int) []byte { func MulRegisterNumber(code []byte, destination cpu.Register, number int) []byte {
return regRegNum(code, byte(destination), byte(destination), number, 0x6B, 0x69) return encodeNum(code, 1, AddressDirect, byte(destination), byte(destination), number, 0x6B, 0x69)
} }
// MulRegisterRegister multiplies a register with another register. // MulRegisterRegister multiplies a register with another register.
func MulRegisterRegister(code []byte, destination cpu.Register, operand cpu.Register) []byte { func MulRegisterRegister(code []byte, destination cpu.Register, operand cpu.Register) []byte {
return regReg(code, byte(destination), byte(operand), 0x0F, 0xAF) return encode(code, 1, AddressDirect, byte(destination), byte(operand), 0x0F, 0xAF)
} }

2
src/build/arch/x64/REX.go
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@ -3,5 +3,5 @@ package x64
// REX is used to generate a REX prefix. // REX is used to generate a REX prefix.
// w, r, x and b can only be set to either 0 or 1. // w, r, x and b can only be set to either 0 or 1.
func REX(w, r, x, b byte) byte { func REX(w, r, x, b byte) byte {
return 0b_0100_0000 | (w << 3) | (r << 2) | (x << 1) | b return 0b0100_0000 | (w << 3) | (r << 2) | (x << 1) | b
} }

16
src/build/arch/x64/SIB.go Normal file
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@ -0,0 +1,16 @@
package x64
const (
Scale1 = byte(0b00)
Scale2 = byte(0b01)
Scale4 = byte(0b10)
Scale8 = byte(0b11)
)
// SIB is used to generate an SIB byte.
// - scale: 2 bits
// - index: 3 bits
// - base: 3 bits
func SIB(scale byte, index byte, base byte) byte {
return (scale << 6) | (index << 3) | base
}

34
src/build/arch/x64/SIB_test.go Normal file
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@ -0,0 +1,34 @@
package x64_test
import (
"testing"
"git.akyoto.dev/cli/q/src/build/arch/x64"
"git.akyoto.dev/go/assert"
)
func TestSIB(t *testing.T) {
testData := []struct{ scale, index, base, expected byte }{
{0b_00, 0b_111, 0b_000, 0b_00_111_000},
{0b_00, 0b_110, 0b_001, 0b_00_110_001},
{0b_00, 0b_101, 0b_010, 0b_00_101_010},
{0b_00, 0b_100, 0b_011, 0b_00_100_011},
{0b_00, 0b_011, 0b_100, 0b_00_011_100},
{0b_00, 0b_010, 0b_101, 0b_00_010_101},
{0b_00, 0b_001, 0b_110, 0b_00_001_110},
{0b_00, 0b_000, 0b_111, 0b_00_000_111},
{0b_11, 0b_111, 0b_000, 0b_11_111_000},
{0b_11, 0b_110, 0b_001, 0b_11_110_001},
{0b_11, 0b_101, 0b_010, 0b_11_101_010},
{0b_11, 0b_100, 0b_011, 0b_11_100_011},
{0b_11, 0b_011, 0b_100, 0b_11_011_100},
{0b_11, 0b_010, 0b_101, 0b_11_010_101},
{0b_11, 0b_001, 0b_110, 0b_11_001_110},
{0b_11, 0b_000, 0b_111, 0b_11_000_111},
}
for _, test := range testData {
sib := x64.SIB(test.scale, test.index, test.base)
assert.Equal(t, sib, test.expected)
}
}

52
src/build/arch/x64/Store.go Normal file
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@ -0,0 +1,52 @@
package x64
import (
"encoding/binary"
"git.akyoto.dev/cli/q/src/build/cpu"
)
// StoreNumber stores a number into the memory address included in the given register.
func StoreNumber(code []byte, register cpu.Register, offset byte, byteCount byte, number int) []byte {
if byteCount == 2 {
code = append(code, 0x66)
}
opCode := byte(0xC7)
if byteCount == 1 {
opCode = 0xC6
}
mod := AddressMemory
if offset != 0 || register == RBP || register == R13 {
mod = AddressMemoryOffset8
}
is64Bit := byte(0)
if byteCount == 8 {
is64Bit = 1
}
code = encode(code, is64Bit, mod, 0b000, byte(register), opCode)
if register == RSP || register == R12 {
code = append(code, SIB(0b00, 0b100, 0b100))
}
if mod == AddressMemoryOffset8 {
code = append(code, offset)
}
switch byteCount {
case 8, 4:
return binary.LittleEndian.AppendUint32(code, uint32(number))
case 2:
return binary.LittleEndian.AppendUint16(code, uint16(number))
}
return append(code, byte(number))
}

157
src/build/arch/x64/Store_test.go Normal file
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@ -0,0 +1,157 @@
package x64_test
import (
"testing"
"git.akyoto.dev/cli/q/src/build/arch/x64"
"git.akyoto.dev/cli/q/src/build/cpu"
"git.akyoto.dev/go/assert"
)
func TestStoreNumber(t *testing.T) {
usagePatterns := []struct {
Register cpu.Register
Offset byte
ByteCount byte
Number int
Code []byte
}{
// No offset
{x64.RAX, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.RAX, 0, 4, 0x7F, []byte{0xC7, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.RAX, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x00, 0x7F, 0x00}},
{x64.RAX, 0, 1, 0x7F, []byte{0xC6, 0x00, 0x7F}},
{x64.RCX, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RCX, 0, 4, 0x7F, []byte{0xC7, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RCX, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x01, 0x7F, 0x00}},
{x64.RCX, 0, 1, 0x7F, []byte{0xC6, 0x01, 0x7F}},
{x64.RDX, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x02, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDX, 0, 4, 0x7F, []byte{0xC7, 0x02, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDX, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x02, 0x7F, 0x00}},
{x64.RDX, 0, 1, 0x7F, []byte{0xC6, 0x02, 0x7F}},
{x64.RBX, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x03, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBX, 0, 4, 0x7F, []byte{0xC7, 0x03, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBX, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x03, 0x7F, 0x00}},
{x64.RBX, 0, 1, 0x7F, []byte{0xC6, 0x03, 0x7F}},
{x64.RSP, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x04, 0x24, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSP, 0, 4, 0x7F, []byte{0xC7, 0x04, 0x24, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSP, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x04, 0x24, 0x7F, 0x00}},
{x64.RSP, 0, 1, 0x7F, []byte{0xC6, 0x04, 0x24, 0x7F}},
{x64.RBP, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x45, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBP, 0, 4, 0x7F, []byte{0xC7, 0x45, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBP, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x45, 0x00, 0x7F, 0x00}},
{x64.RBP, 0, 1, 0x7F, []byte{0xC6, 0x45, 0x00, 0x7F}},
{x64.RSI, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x06, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSI, 0, 4, 0x7F, []byte{0xC7, 0x06, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSI, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x06, 0x7F, 0x00}},
{x64.RSI, 0, 1, 0x7F, []byte{0xC6, 0x06, 0x7F}},
{x64.RDI, 0, 8, 0x7F, []byte{0x48, 0xC7, 0x07, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDI, 0, 4, 0x7F, []byte{0xC7, 0x07, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDI, 0, 2, 0x7F, []byte{0x66, 0xC7, 0x07, 0x7F, 0x00}},
{x64.RDI, 0, 1, 0x7F, []byte{0xC6, 0x07, 0x7F}},
{x64.R8, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.R8, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.R8, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x00, 0x7F, 0x00}},
{x64.R8, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x00, 0x7F}},
{x64.R9, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R9, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R9, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x01, 0x7F, 0x00}},
{x64.R9, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x01, 0x7F}},
{x64.R10, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x02, 0x7F, 0x00, 0x00, 0x00}},
{x64.R10, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x02, 0x7F, 0x00, 0x00, 0x00}},
{x64.R10, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x02, 0x7F, 0x00}},
{x64.R10, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x02, 0x7F}},
{x64.R11, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x03, 0x7F, 0x00, 0x00, 0x00}},
{x64.R11, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x03, 0x7F, 0x00, 0x00, 0x00}},
{x64.R11, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x03, 0x7F, 0x00}},
{x64.R11, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x03, 0x7F}},
{x64.R12, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x04, 0x24, 0x7F, 0x00, 0x00, 0x00}},
{x64.R12, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x04, 0x24, 0x7F, 0x00, 0x00, 0x00}},
{x64.R12, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x04, 0x24, 0x7F, 0x00}},
{x64.R12, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x04, 0x24, 0x7F}},
{x64.R13, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x45, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.R13, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x45, 0x00, 0x7F, 0x00, 0x00, 0x00}},
{x64.R13, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x45, 0x00, 0x7F, 0x00}},
{x64.R13, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x45, 0x00, 0x7F}},
{x64.R14, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x06, 0x7F, 0x00, 0x00, 0x00}},
{x64.R14, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x06, 0x7F, 0x00, 0x00, 0x00}},
{x64.R14, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x06, 0x7F, 0x00}},
{x64.R14, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x06, 0x7F}},
{x64.R15, 0, 8, 0x7F, []byte{0x49, 0xC7, 0x07, 0x7F, 0x00, 0x00, 0x00}},
{x64.R15, 0, 4, 0x7F, []byte{0x41, 0xC7, 0x07, 0x7F, 0x00, 0x00, 0x00}},
{x64.R15, 0, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x07, 0x7F, 0x00}},
{x64.R15, 0, 1, 0x7F, []byte{0x41, 0xC6, 0x07, 0x7F}},
// Offset of 1
{x64.RAX, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x40, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RAX, 1, 4, 0x7F, []byte{0xC7, 0x40, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RAX, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x40, 0x01, 0x7F, 0x00}},
{x64.RAX, 1, 1, 0x7F, []byte{0xC6, 0x40, 0x01, 0x7F}},
{x64.RCX, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x41, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RCX, 1, 4, 0x7F, []byte{0xC7, 0x41, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RCX, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x41, 0x01, 0x7F, 0x00}},
{x64.RCX, 1, 1, 0x7F, []byte{0xC6, 0x41, 0x01, 0x7F}},
{x64.RDX, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x42, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDX, 1, 4, 0x7F, []byte{0xC7, 0x42, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDX, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x42, 0x01, 0x7F, 0x00}},
{x64.RDX, 1, 1, 0x7F, []byte{0xC6, 0x42, 0x01, 0x7F}},
{x64.RBX, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x43, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBX, 1, 4, 0x7F, []byte{0xC7, 0x43, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBX, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x43, 0x01, 0x7F, 0x00}},
{x64.RBX, 1, 1, 0x7F, []byte{0xC6, 0x43, 0x01, 0x7F}},
{x64.RDI, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x47, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDI, 1, 4, 0x7F, []byte{0xC7, 0x47, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RDI, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x47, 0x01, 0x7F, 0x00}},
{x64.RDI, 1, 1, 0x7F, []byte{0xC6, 0x47, 0x01, 0x7F}},
{x64.RSI, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x46, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSI, 1, 4, 0x7F, []byte{0xC7, 0x46, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSI, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x46, 0x01, 0x7F, 0x00}},
{x64.RSI, 1, 1, 0x7F, []byte{0xC6, 0x46, 0x01, 0x7F}},
{x64.RBP, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x45, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBP, 1, 4, 0x7F, []byte{0xC7, 0x45, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RBP, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x45, 0x01, 0x7F, 0x00}},
{x64.RBP, 1, 1, 0x7F, []byte{0xC6, 0x45, 0x01, 0x7F}},
{x64.RSP, 1, 8, 0x7F, []byte{0x48, 0xC7, 0x44, 0x24, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSP, 1, 4, 0x7F, []byte{0xC7, 0x44, 0x24, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.RSP, 1, 2, 0x7F, []byte{0x66, 0xC7, 0x44, 0x24, 0x01, 0x7F, 0x00}},
{x64.RSP, 1, 1, 0x7F, []byte{0xC6, 0x44, 0x24, 0x01, 0x7F}},
{x64.R8, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x40, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R8, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x40, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R8, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x40, 0x01, 0x7F, 0x00}},
{x64.R8, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x40, 0x01, 0x7F}},
{x64.R9, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x41, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R9, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x41, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R9, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x41, 0x01, 0x7F, 0x00}},
{x64.R9, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x41, 0x01, 0x7F}},
{x64.R10, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x42, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R10, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x42, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R10, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x42, 0x01, 0x7F, 0x00}},
{x64.R10, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x42, 0x01, 0x7F}},
{x64.R11, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x43, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R11, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x43, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R11, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x43, 0x01, 0x7F, 0x00}},
{x64.R11, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x43, 0x01, 0x7F}},
{x64.R12, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x44, 0x24, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R12, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x44, 0x24, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R12, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x44, 0x24, 0x01, 0x7F, 0x00}},
{x64.R12, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x44, 0x24, 0x01, 0x7F}},
{x64.R13, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x45, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R13, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x45, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R13, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x45, 0x01, 0x7F, 0x00}},
{x64.R13, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x45, 0x01, 0x7F}},
{x64.R14, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x46, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R14, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x46, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R14, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x46, 0x01, 0x7F, 0x00}},
{x64.R14, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x46, 0x01, 0x7F}},
{x64.R15, 1, 8, 0x7F, []byte{0x49, 0xC7, 0x47, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R15, 1, 4, 0x7F, []byte{0x41, 0xC7, 0x47, 0x01, 0x7F, 0x00, 0x00, 0x00}},
{x64.R15, 1, 2, 0x7F, []byte{0x66, 0x41, 0xC7, 0x47, 0x01, 0x7F, 0x00}},
{x64.R15, 1, 1, 0x7F, []byte{0x41, 0xC6, 0x47, 0x01, 0x7F}},
}
for _, pattern := range usagePatterns {
t.Logf("store %dB [%s+%d], %d", pattern.ByteCount, pattern.Register, pattern.Offset, pattern.Number)
code := x64.StoreNumber(nil, pattern.Register, pattern.Offset, pattern.ByteCount, pattern.Number)
assert.DeepEqual(t, code, pattern.Code)
}
}

4
src/build/arch/x64/Sub.go
View File

@ -6,10 +6,10 @@ import (
// SubRegisterNumber subtracts a number from the given register. // SubRegisterNumber subtracts a number from the given register.
func SubRegisterNumber(code []byte, destination cpu.Register, number int) []byte { func SubRegisterNumber(code []byte, destination cpu.Register, number int) []byte {
return regRegNum(code, 0b101, byte(destination), number, 0x83, 0x81) return encodeNum(code, 1, AddressDirect, 0b101, byte(destination), number, 0x83, 0x81)
} }
// SubRegisterRegister subtracts a register value from another register. // SubRegisterRegister subtracts a register value from another register.
func SubRegisterRegister(code []byte, destination cpu.Register, operand cpu.Register) []byte { func SubRegisterRegister(code []byte, destination cpu.Register, operand cpu.Register) []byte {
return regReg(code, byte(operand), byte(destination), 0x29) return encode(code, 1, AddressDirect, byte(operand), byte(destination), 0x29)
} }

27
src/build/arch/x64/encode.go Normal file
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@ -0,0 +1,27 @@
package x64
// encode is the core function that encodes an instruction.
func encode(code []byte, w byte, mod byte, reg byte, rm byte, opCodes ...byte) []byte {
r := byte(0) // Extension to the "reg" field in ModRM.
x := byte(0) // Extension to the SIB index field.
b := byte(0) // Extension to the "rm" field in ModRM or the SIB base (r8 up to r15 use this).
if reg > 0b111 {
r = 1
reg &= 0b111
}
if rm > 0b111 {
b = 1
rm &= 0b111
}
if w != 0 || r != 0 || x != 0 || b != 0 {
code = append(code, REX(w, r, x, b))
}
code = append(code, opCodes...)
code = append(code, ModRM(mod, reg, rm))
return code
}

14
src/build/arch/x64/encodeNum.go Normal file
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@ -0,0 +1,14 @@
package x64
import "encoding/binary"
// encodeNum encodes an instruction with up to two registers and a number parameter.
func encodeNum(code []byte, w byte, mod byte, reg byte, rm byte, number int, opCode8 byte, opCode32 byte) []byte {
if SizeOf(int64(number)) == 1 {
code = encode(code, w, mod, reg, rm, opCode8)
return append(code, byte(number))
}
code = encode(code, w, mod, reg, rm, opCode32)
return binary.LittleEndian.AppendUint32(code, uint32(number))
}

29
src/build/arch/x64/regReg.go
View File

@ -1,29 +0,0 @@
package x64
// regReg encodes an operation using 2 registers.
func regReg(code []byte, reg byte, rm byte, opCodes ...byte) []byte {
w := byte(1) // Indicates a 64-bit register.
r := byte(0) // Extension to the "reg" field in ModRM.
x := byte(0) // Extension to the SIB index field.
b := byte(0) // Extension to the "rm" field in ModRM or the SIB base (r8 up to r15 use this).
mod := byte(0b11) // Direct addressing mode, no register offsets.
if reg > 0b111 {
r = 1
reg &= 0b111
}
if rm > 0b111 {
b = 1
rm &= 0b111
}
rex := REX(w, r, x, b)
modRM := ModRM(mod, reg, rm)
code = append(code, rex)
code = append(code, opCodes...)
code = append(code, modRM)
return code
}

14
src/build/arch/x64/regRegNum.go
View File

@ -1,14 +0,0 @@
package x64
import "encoding/binary"
// regRegNum encodes an instruction with up to two registers and a number parameter.
func regRegNum(code []byte, reg byte, rm byte, number int, opCode8 byte, opCode32 byte) []byte {
if SizeOf(int64(number)) == 1 {
code = regReg(code, reg, rm, opCode8)
return append(code, byte(number))
}
code = regReg(code, reg, rm, opCode32)
return binary.LittleEndian.AppendUint32(code, uint32(number))
}