mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-15 11:46:45 +00:00
510 lines
18 KiB
Go
510 lines
18 KiB
Go
package x86_64
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import (
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`errors`
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`fmt`
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`math`
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`reflect`
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`strconv`
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`strings`
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`sync/atomic`
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)
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// RelativeOffset represents an RIP-relative offset.
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type RelativeOffset int32
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// String implements the fmt.Stringer interface.
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func (self RelativeOffset) String() string {
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if self == 0 {
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return "(%rip)"
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} else {
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return fmt.Sprintf("%d(%%rip)", self)
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}
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}
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// RoundingControl represents a floating-point rounding option.
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type RoundingControl uint8
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const (
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// RN_SAE represents "Round Nearest", which is the default rounding option.
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RN_SAE RoundingControl = iota
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// RD_SAE represents "Round Down".
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RD_SAE
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// RU_SAE represents "Round Up".
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RU_SAE
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// RZ_SAE represents "Round towards Zero".
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RZ_SAE
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)
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var _RC_NAMES = map[RoundingControl]string {
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RN_SAE: "rn-sae",
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RD_SAE: "rd-sae",
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RU_SAE: "ru-sae",
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RZ_SAE: "rz-sae",
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}
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func (self RoundingControl) String() string {
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if v, ok := _RC_NAMES[self]; ok {
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return v
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} else {
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panic("invalid RoundingControl value")
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}
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}
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// ExceptionControl represents the "Suppress All Exceptions" flag.
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type ExceptionControl uint8
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const (
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// SAE represents the flag "Suppress All Exceptions" for floating point operations.
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SAE ExceptionControl = iota
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)
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func (ExceptionControl) String() string {
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return "sae"
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}
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// AddressType indicates which kind of value that an Addressable object contains.
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type AddressType uint
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const (
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// None indicates the Addressable does not contain any addressable value.
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None AddressType = iota
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// Memory indicates the Addressable contains a memory address.
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Memory
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// Offset indicates the Addressable contains an RIP-relative offset.
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Offset
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// Reference indicates the Addressable contains a label reference.
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Reference
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)
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// Disposable is a type of object that can be Free'd manually.
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type Disposable interface {
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Free()
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}
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// Label represents a location within the program.
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type Label struct {
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refs int64
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Name string
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Dest *Instruction
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}
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func (self *Label) offset(p uintptr, n int) RelativeOffset {
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if self.Dest == nil {
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panic("unresolved label: " + self.Name)
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} else {
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return RelativeOffset(self.Dest.pc - p - uintptr(n))
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}
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}
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// Free decreases the reference count of a Label, if the
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// refcount drops to 0, the Label will be recycled.
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func (self *Label) Free() {
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if atomic.AddInt64(&self.refs, -1) == 0 {
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freeLabel(self)
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}
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}
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// String implements the fmt.Stringer interface.
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func (self *Label) String() string {
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if self.Dest == nil {
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return fmt.Sprintf("%s(%%rip)", self.Name)
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} else {
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return fmt.Sprintf("%s(%%rip)@%#x", self.Name, self.Dest.pc)
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}
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}
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// Retain increases the reference count of a Label.
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func (self *Label) Retain() *Label {
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atomic.AddInt64(&self.refs, 1)
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return self
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}
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// Evaluate implements the interface expr.Term.
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func (self *Label) Evaluate() (int64, error) {
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if self.Dest != nil {
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return int64(self.Dest.pc), nil
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} else {
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return 0, errors.New("unresolved label: " + self.Name)
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}
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}
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// Addressable is a union to represent an addressable operand.
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type Addressable struct {
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Type AddressType
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Memory MemoryAddress
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Offset RelativeOffset
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Reference *Label
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}
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// String implements the fmt.Stringer interface.
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func (self *Addressable) String() string {
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switch self.Type {
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case None : return "(not addressable)"
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case Memory : return self.Memory.String()
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case Offset : return self.Offset.String()
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case Reference : return self.Reference.String()
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default : return "(invalid addressable)"
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}
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}
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// MemoryOperand represents a memory operand for an instruction.
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type MemoryOperand struct {
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refs int64
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Size int
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Addr Addressable
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Mask RegisterMask
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Masked bool
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Broadcast uint8
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}
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const (
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_Sizes = 0b10000000100010111 // bit-mask for valid sizes (0, 1, 2, 4, 8, 16)
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)
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func (self *MemoryOperand) isVMX(evex bool) bool {
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return self.Addr.Type == Memory && self.Addr.Memory.isVMX(evex)
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}
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func (self *MemoryOperand) isVMY(evex bool) bool {
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return self.Addr.Type == Memory && self.Addr.Memory.isVMY(evex)
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}
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func (self *MemoryOperand) isVMZ() bool {
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return self.Addr.Type == Memory && self.Addr.Memory.isVMZ()
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}
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func (self *MemoryOperand) isMem() bool {
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if (_Sizes & (1 << self.Broadcast)) == 0 {
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return false
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} else if self.Addr.Type == Memory {
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return self.Addr.Memory.isMem()
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} else if self.Addr.Type == Offset {
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return true
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} else if self.Addr.Type == Reference {
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return true
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} else {
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return false
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}
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}
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func (self *MemoryOperand) isSize(n int) bool {
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return self.Size == 0 || self.Size == n
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}
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func (self *MemoryOperand) isBroadcast(n int, b uint8) bool {
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return self.Size == n && self.Broadcast == b
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}
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func (self *MemoryOperand) formatMask() string {
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if !self.Masked {
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return ""
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} else {
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return self.Mask.String()
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}
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}
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func (self *MemoryOperand) formatBroadcast() string {
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if self.Broadcast == 0 {
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return ""
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} else {
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return fmt.Sprintf("{1to%d}", self.Broadcast)
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}
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}
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func (self *MemoryOperand) ensureAddrValid() {
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switch self.Addr.Type {
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case None : break
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case Memory : self.Addr.Memory.EnsureValid()
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case Offset : break
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case Reference : break
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default : panic("invalid address type")
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}
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}
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func (self *MemoryOperand) ensureSizeValid() {
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if (_Sizes & (1 << self.Size)) == 0 {
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panic("invalid memory operand size")
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}
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}
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func (self *MemoryOperand) ensureBroadcastValid() {
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if (_Sizes & (1 << self.Broadcast)) == 0 {
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panic("invalid memory operand broadcast")
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}
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}
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// Free decreases the reference count of a MemoryOperand, if the
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// refcount drops to 0, the Label will be recycled.
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func (self *MemoryOperand) Free() {
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if atomic.AddInt64(&self.refs, -1) == 0 {
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freeMemoryOperand(self)
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}
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}
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// String implements the fmt.Stringer interface.
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func (self *MemoryOperand) String() string {
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return self.Addr.String() + self.formatMask() + self.formatBroadcast()
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}
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// Retain increases the reference count of a MemoryOperand.
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func (self *MemoryOperand) Retain() *MemoryOperand {
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atomic.AddInt64(&self.refs, 1)
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return self
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}
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// EnsureValid checks if the memory operand is valid, if not, it panics.
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func (self *MemoryOperand) EnsureValid() {
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self.ensureAddrValid()
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self.ensureSizeValid()
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self.ensureBroadcastValid()
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}
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// MemoryAddress represents a memory address.
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type MemoryAddress struct {
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Base Register
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Index Register
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Scale uint8
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Displacement int32
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}
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const (
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_Scales = 0b100010111 // bit-mask for valid scales (0, 1, 2, 4, 8)
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)
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func (self *MemoryAddress) isVMX(evex bool) bool {
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return self.isMemBase() && (self.Index == nil || isXMM(self.Index) || (evex && isEVEXXMM(self.Index)))
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}
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func (self *MemoryAddress) isVMY(evex bool) bool {
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return self.isMemBase() && (self.Index == nil || isYMM(self.Index) || (evex && isEVEXYMM(self.Index)))
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}
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func (self *MemoryAddress) isVMZ() bool {
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return self.isMemBase() && (self.Index == nil || isZMM(self.Index))
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}
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func (self *MemoryAddress) isMem() bool {
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return self.isMemBase() && (self.Index == nil || isReg64(self.Index))
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}
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func (self *MemoryAddress) isMemBase() bool {
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return (self.Base == nil || isReg64(self.Base)) && // `Base` must be 64-bit if present
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(self.Scale == 0) == (self.Index == nil) && // `Scale` and `Index` depends on each other
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(_Scales & (1 << self.Scale)) != 0 // `Scale` can only be 0, 1, 2, 4 or 8
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}
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// String implements the fmt.Stringer interface.
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func (self *MemoryAddress) String() string {
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var dp int
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var sb strings.Builder
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/* the displacement part */
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if dp = int(self.Displacement); dp != 0 {
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sb.WriteString(strconv.Itoa(dp))
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}
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/* the base register */
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if sb.WriteByte('('); self.Base != nil {
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sb.WriteByte('%')
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sb.WriteString(self.Base.String())
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}
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/* index is optional */
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if self.Index != nil {
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sb.WriteString(",%")
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sb.WriteString(self.Index.String())
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/* scale is also optional */
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if self.Scale >= 2 {
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sb.WriteByte(',')
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sb.WriteString(strconv.Itoa(int(self.Scale)))
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}
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}
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/* close the bracket */
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sb.WriteByte(')')
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return sb.String()
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}
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// EnsureValid checks if the memory address is valid, if not, it panics.
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func (self *MemoryAddress) EnsureValid() {
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if !self.isMemBase() || (self.Index != nil && !isIndexable(self.Index)) {
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panic("not a valid memory address")
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}
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}
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// Ref constructs a memory reference to a label.
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func Ref(ref *Label) (v *MemoryOperand) {
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v = CreateMemoryOperand()
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v.Addr.Type = Reference
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v.Addr.Reference = ref
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return
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}
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// Abs construct a simple memory address that represents absolute addressing.
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func Abs(disp int32) *MemoryOperand {
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return Sib(nil, nil, 0, disp)
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}
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// Ptr constructs a simple memory operand with base and displacement.
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func Ptr(base Register, disp int32) *MemoryOperand {
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return Sib(base, nil, 0, disp)
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}
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// Sib constructs a simple memory operand that represents a complete memory address.
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func Sib(base Register, index Register, scale uint8, disp int32) (v *MemoryOperand) {
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v = CreateMemoryOperand()
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v.Addr.Type = Memory
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v.Addr.Memory.Base = base
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v.Addr.Memory.Index = index
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v.Addr.Memory.Scale = scale
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v.Addr.Memory.Displacement = disp
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v.EnsureValid()
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return
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}
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/** Operand Matching Helpers **/
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const _IntMask =
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(1 << reflect.Int ) |
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(1 << reflect.Int8 ) |
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(1 << reflect.Int16 ) |
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(1 << reflect.Int32 ) |
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(1 << reflect.Int64 ) |
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(1 << reflect.Uint ) |
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(1 << reflect.Uint8 ) |
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(1 << reflect.Uint16 ) |
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(1 << reflect.Uint32 ) |
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(1 << reflect.Uint64 ) |
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(1 << reflect.Uintptr)
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func isInt(k reflect.Kind) bool {
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return (_IntMask & (1 << k)) != 0
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}
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func asInt64(v interface{}) (int64, bool) {
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if isSpecial(v) {
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return 0, false
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} else if x := efaceOf(v); isInt(x.kind()) {
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return x.toInt64(), true
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} else {
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return 0, false
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}
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}
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func inRange(v interface{}, low int64, high int64) bool {
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x, ok := asInt64(v)
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return ok && x >= low && x <= high
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}
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func isSpecial(v interface{}) bool {
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switch v.(type) {
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case Register8 : return true
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case Register16 : return true
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case Register32 : return true
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case Register64 : return true
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case KRegister : return true
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case MMRegister : return true
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case XMMRegister : return true
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case YMMRegister : return true
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case ZMMRegister : return true
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case RelativeOffset : return true
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case RoundingControl : return true
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case ExceptionControl : return true
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default : return false
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}
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}
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func isIndexable(v interface{}) bool {
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return isZMM(v) || isReg64(v) || isEVEXXMM(v) || isEVEXYMM(v)
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}
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func isImm4 (v interface{}) bool { return inRange(v, 0, 15) }
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func isImm8 (v interface{}) bool { return inRange(v, math.MinInt8, math.MaxUint8) }
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func isImm16 (v interface{}) bool { return inRange(v, math.MinInt16, math.MaxUint16) }
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func isImm32 (v interface{}) bool { return inRange(v, math.MinInt32, math.MaxUint32) }
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func isImm64 (v interface{}) bool { _, r := asInt64(v) ; return r }
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func isConst1 (v interface{}) bool { x, r := asInt64(v) ; return r && x == 1 }
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func isConst3 (v interface{}) bool { x, r := asInt64(v) ; return r && x == 3 }
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func isRel8 (v interface{}) bool { x, r := v.(RelativeOffset) ; return r && x >= math.MinInt8 && x <= math.MaxInt8 }
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func isRel32 (v interface{}) bool { _, r := v.(RelativeOffset) ; return r }
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func isLabel (v interface{}) bool { _, r := v.(*Label) ; return r }
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func isReg8 (v interface{}) bool { _, r := v.(Register8) ; return r }
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func isReg8REX (v interface{}) bool { x, r := v.(Register8) ; return r && (x & 0x80) == 0 && x >= SPL }
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func isReg16 (v interface{}) bool { _, r := v.(Register16) ; return r }
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func isReg32 (v interface{}) bool { _, r := v.(Register32) ; return r }
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func isReg64 (v interface{}) bool { _, r := v.(Register64) ; return r }
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func isMM (v interface{}) bool { _, r := v.(MMRegister) ; return r }
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func isXMM (v interface{}) bool { x, r := v.(XMMRegister) ; return r && x <= XMM15 }
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func isEVEXXMM (v interface{}) bool { _, r := v.(XMMRegister) ; return r }
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func isXMMk (v interface{}) bool { x, r := v.(MaskedRegister) ; return isXMM(v) || (r && isXMM(x.Reg) && !x.Mask.Z) }
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func isXMMkz (v interface{}) bool { x, r := v.(MaskedRegister) ; return isXMM(v) || (r && isXMM(x.Reg)) }
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func isYMM (v interface{}) bool { x, r := v.(YMMRegister) ; return r && x <= YMM15 }
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func isEVEXYMM (v interface{}) bool { _, r := v.(YMMRegister) ; return r }
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func isYMMk (v interface{}) bool { x, r := v.(MaskedRegister) ; return isYMM(v) || (r && isYMM(x.Reg) && !x.Mask.Z) }
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func isYMMkz (v interface{}) bool { x, r := v.(MaskedRegister) ; return isYMM(v) || (r && isYMM(x.Reg)) }
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func isZMM (v interface{}) bool { _, r := v.(ZMMRegister) ; return r }
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func isZMMk (v interface{}) bool { x, r := v.(MaskedRegister) ; return isZMM(v) || (r && isZMM(x.Reg) && !x.Mask.Z) }
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func isZMMkz (v interface{}) bool { x, r := v.(MaskedRegister) ; return isZMM(v) || (r && isZMM(x.Reg)) }
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func isK (v interface{}) bool { _, r := v.(KRegister) ; return r }
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func isKk (v interface{}) bool { x, r := v.(MaskedRegister) ; return isK(v) || (r && isK(x.Reg) && !x.Mask.Z) }
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func isM (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isMem() && x.Broadcast == 0 && !x.Masked }
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func isMk (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isMem() && x.Broadcast == 0 && !(x.Masked && x.Mask.Z) }
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func isMkz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isMem() && x.Broadcast == 0 }
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func isM8 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(1) }
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func isM16 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(2) }
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func isM16kz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMkz(v) && x.isSize(2) }
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func isM32 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(4) }
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func isM32k (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMk(v) && x.isSize(4) }
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func isM32kz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMkz(v) && x.isSize(4) }
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func isM64 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(8) }
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func isM64k (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMk(v) && x.isSize(8) }
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func isM64kz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMkz(v) && x.isSize(8) }
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func isM128 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(16) }
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func isM128kz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMkz(v) && x.isSize(16) }
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func isM256 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(32) }
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func isM256kz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMkz(v) && x.isSize(32) }
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func isM512 (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isM(v) && x.isSize(64) }
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func isM512kz (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && isMkz(v) && x.isSize(64) }
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func isM64M32bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM64(v) || (r && x.isBroadcast(4, 2)) }
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func isM128M32bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM128(v) || (r && x.isBroadcast(4, 4)) }
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func isM256M32bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM256(v) || (r && x.isBroadcast(4, 8)) }
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func isM512M32bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM512(v) || (r && x.isBroadcast(4, 16)) }
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func isM128M64bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM128(v) || (r && x.isBroadcast(8, 2)) }
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func isM256M64bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM256(v) || (r && x.isBroadcast(8, 4)) }
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func isM512M64bcst (v interface{}) bool { x, r := v.(*MemoryOperand) ; return isM512(v) || (r && x.isBroadcast(8, 8)) }
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|
func isVMX (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMX(false) && !x.Masked }
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|
func isEVEXVMX (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMX(true) && !x.Masked }
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|
func isVMXk (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMX(true) }
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|
func isVMY (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMY(false) && !x.Masked }
|
|
func isEVEXVMY (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMY(true) && !x.Masked }
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|
func isVMYk (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMY(true) }
|
|
func isVMZ (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMZ() && !x.Masked }
|
|
func isVMZk (v interface{}) bool { x, r := v.(*MemoryOperand) ; return r && x.isVMZ() }
|
|
func isSAE (v interface{}) bool { _, r := v.(ExceptionControl) ; return r }
|
|
func isER (v interface{}) bool { _, r := v.(RoundingControl) ; return r }
|
|
|
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func isImmExt(v interface{}, ext int, min int64, max int64) bool {
|
|
if x, ok := asInt64(v); !ok {
|
|
return false
|
|
} else if m := int64(1) << (8 * ext); x < m && x >= m + min {
|
|
return true
|
|
} else {
|
|
return x <= max && x >= min
|
|
}
|
|
}
|
|
|
|
func isImm8Ext(v interface{}, ext int) bool {
|
|
return isImmExt(v, ext, math.MinInt8, math.MaxInt8)
|
|
}
|
|
|
|
func isImm32Ext(v interface{}, ext int) bool {
|
|
return isImmExt(v, ext, math.MinInt32, math.MaxInt32)
|
|
}
|