diff --git a/src/arm/Registers.go b/src/arm/Registers.go
index 9204b69..6277134 100644
--- a/src/arm/Registers.go
+++ b/src/arm/Registers.go
@@ -3,7 +3,7 @@ package arm
import "git.urbach.dev/cli/q/src/cpu"
const (
- X0 cpu.Register = iota
+ X0 cpu.Register = iota // Function arguments and return values [0-7]
X1
X2
X3
@@ -11,18 +11,18 @@ const (
X5
X6
X7
- X8
- X9
+ X8 // Indirect result location register (used to pass a pointer to a structure return value)
+ X9 // Temporary registers (caller-saved, used for general computation) [9-15]
X10
X11
X12
X13
X14
X15
- X16
+ X16 // Intra-procedure call scratch registers [16-17]
X17
- X18
- X19
+ X18 // Platform register (reserved by the platform ABI for thread-local storage)
+ X19 // Callee-saved registers (must be preserved across function calls) [19-28]
X20
X21
X22
@@ -32,14 +32,18 @@ const (
X26
X27
X28
- FP // Frame pointer
- LR // Link register
- SP // Stack pointer
- ZR = SP // Zero register uses the same numerical value as SP
+ FP // Frame pointer
+ LR // Link register
+ SP // Stack pointer
+)
+
+const (
+ ZR = SP // Zero register uses the same numerical value as SP
+ TMP = X28 // Temporary register for the assembler
)
var (
- GeneralRegisters = []cpu.Register{X9, X10, X11, X12, X13, X14, X15, X16, X17, X18, X19, X20, X21, X22, X23, X24, X25, X26, X27, X28}
+ GeneralRegisters = []cpu.Register{X9, X10, X11, X12, X13, X14, X15, X16, X17, X19, X20, X21, X22, X23, X24, X25, X26, X27, X28}
InputRegisters = []cpu.Register{X0, X1, X2, X3, X4, X5}
OutputRegisters = InputRegisters
SyscallInputRegisters = []cpu.Register{X8, X0, X1, X2, X3, X4, X5}
diff --git a/src/asmc/ARM.go b/src/asmc/ARM.go
index 1d98cb1..a4d2347 100644
--- a/src/asmc/ARM.go
+++ b/src/asmc/ARM.go
@@ -113,9 +113,8 @@ func (c *compiler) ARM(x asm.Instruction) {
operands := c.assembler.Param.MemoryNumber[x.Index]
if operands.Address.OffsetRegister < 0 {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumber(c.code, tmp, operands.Number)
- c.append(arm.StoreRegister(tmp, operands.Address.Base, int(operands.Address.Offset), operands.Address.Length))
+ c.code = arm.MoveRegisterNumber(c.code, arm.TMP, operands.Number)
+ c.append(arm.StoreRegister(arm.TMP, operands.Address.Base, int(operands.Address.Offset), operands.Address.Length))
} else {
panic("not implemented")
}
@@ -155,9 +154,8 @@ func (c *compiler) ARM(x asm.Instruction) {
if encodable {
c.append(code)
} else {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumberMI(c.code, tmp, operand.Number)
- c.append(arm.AndRegisterRegister(operand.Register, operand.Register, tmp))
+ c.code = arm.MoveRegisterNumberMI(c.code, arm.TMP, operand.Number)
+ c.append(arm.AndRegisterRegister(operand.Register, operand.Register, arm.TMP))
}
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
@@ -173,9 +171,8 @@ func (c *compiler) ARM(x asm.Instruction) {
if encodable {
c.append(code)
} else {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumberMI(c.code, tmp, operand.Number)
- c.append(arm.OrRegisterRegister(operand.Register, operand.Register, tmp))
+ c.code = arm.MoveRegisterNumberMI(c.code, arm.TMP, operand.Number)
+ c.append(arm.OrRegisterRegister(operand.Register, operand.Register, arm.TMP))
}
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
@@ -191,9 +188,8 @@ func (c *compiler) ARM(x asm.Instruction) {
if encodable {
c.append(code)
} else {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumberMI(c.code, tmp, operand.Number)
- c.append(arm.XorRegisterRegister(operand.Register, operand.Register, tmp))
+ c.code = arm.MoveRegisterNumberMI(c.code, arm.TMP, operand.Number)
+ c.append(arm.XorRegisterRegister(operand.Register, operand.Register, arm.TMP))
}
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
@@ -209,9 +205,8 @@ func (c *compiler) ARM(x asm.Instruction) {
if encodable {
c.append(code)
} else {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumber(c.code, tmp, operand.Number)
- c.append(arm.AddRegisterRegister(operand.Register, operand.Register, tmp))
+ c.code = arm.MoveRegisterNumber(c.code, arm.TMP, operand.Number)
+ c.append(arm.AddRegisterRegister(operand.Register, operand.Register, arm.TMP))
}
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
@@ -227,9 +222,8 @@ func (c *compiler) ARM(x asm.Instruction) {
if encodable {
c.append(code)
} else {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumber(c.code, tmp, operand.Number)
- c.append(arm.SubRegisterRegister(operand.Register, operand.Register, tmp))
+ c.code = arm.MoveRegisterNumber(c.code, arm.TMP, operand.Number)
+ c.append(arm.SubRegisterRegister(operand.Register, operand.Register, arm.TMP))
}
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
@@ -245,9 +239,8 @@ func (c *compiler) ARM(x asm.Instruction) {
if encodable {
c.append(code)
} else {
- tmp := arm.X28
- c.code = arm.MoveRegisterNumber(c.code, tmp, operand.Number)
- c.append(arm.CompareRegisterRegister(operand.Register, tmp))
+ c.code = arm.MoveRegisterNumber(c.code, arm.TMP, operand.Number)
+ c.append(arm.CompareRegisterRegister(operand.Register, arm.TMP))
}
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
@@ -270,18 +263,16 @@ func (c *compiler) ARM(x asm.Instruction) {
c.append(arm.MulRegisterRegister(operand.Destination, operand.Destination, operand.Source))
case asm.TypeRegisterNumber:
operand := c.assembler.Param.RegisterNumber[x.Index]
- tmp := arm.X28
- c.code = arm.MoveRegisterNumber(c.code, tmp, operand.Number)
- c.append(arm.MulRegisterRegister(operand.Register, operand.Register, tmp))
+ c.code = arm.MoveRegisterNumber(c.code, arm.TMP, operand.Number)
+ c.append(arm.MulRegisterRegister(operand.Register, operand.Register, arm.TMP))
}
case asm.MODULO:
switch x.Type {
case asm.TypeRegisterRegister:
operand := c.assembler.Param.RegisterRegister[x.Index]
- tmp := arm.X28
- c.append(arm.DivSigned(tmp, operand.Destination, operand.Source))
- c.append(arm.MultiplySubtract(operand.Destination, tmp, operand.Source, operand.Destination))
+ c.append(arm.DivSigned(arm.TMP, operand.Destination, operand.Source))
+ c.append(arm.MultiplySubtract(operand.Destination, arm.TMP, operand.Source, operand.Destination))
case asm.TypeRegisterNumber:
panic("not implemented")
}