74c98bc961
Support for position independent executables (PIE) on the native linux backend, the gdbserver backend on linux and the core backend. Also implemented in the windows native backend, but it can't be tested because go doesn't support PIE on windows yet.
103 lines
2.0 KiB
Go
103 lines
2.0 KiB
Go
package op
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
)
|
|
|
|
type DwarfRegisters struct {
|
|
StaticBase uint64
|
|
|
|
CFA int64
|
|
FrameBase int64
|
|
ObjBase int64
|
|
Regs []*DwarfRegister
|
|
|
|
ByteOrder binary.ByteOrder
|
|
PCRegNum uint64
|
|
SPRegNum uint64
|
|
BPRegNum uint64
|
|
}
|
|
|
|
type DwarfRegister struct {
|
|
Uint64Val uint64
|
|
Bytes []byte
|
|
}
|
|
|
|
// Uint64Val returns the uint64 value of register idx.
|
|
func (regs *DwarfRegisters) Uint64Val(idx uint64) uint64 {
|
|
reg := regs.Reg(idx)
|
|
if reg == nil {
|
|
return 0
|
|
}
|
|
return regs.Regs[idx].Uint64Val
|
|
}
|
|
|
|
// Bytes returns the bytes value of register idx, nil if the register is not
|
|
// defined.
|
|
func (regs *DwarfRegisters) Bytes(idx uint64) []byte {
|
|
reg := regs.Reg(idx)
|
|
if reg == nil {
|
|
return nil
|
|
}
|
|
if reg.Bytes == nil {
|
|
var buf bytes.Buffer
|
|
binary.Write(&buf, regs.ByteOrder, reg.Uint64Val)
|
|
reg.Bytes = buf.Bytes()
|
|
}
|
|
return reg.Bytes
|
|
}
|
|
|
|
// Reg returns register idx or nil if the register is not defined.
|
|
func (regs *DwarfRegisters) Reg(idx uint64) *DwarfRegister {
|
|
if idx >= uint64(len(regs.Regs)) {
|
|
return nil
|
|
}
|
|
return regs.Regs[idx]
|
|
}
|
|
|
|
func (regs *DwarfRegisters) PC() uint64 {
|
|
return regs.Uint64Val(regs.PCRegNum)
|
|
}
|
|
|
|
func (regs *DwarfRegisters) SP() uint64 {
|
|
return regs.Uint64Val(regs.SPRegNum)
|
|
}
|
|
|
|
func (regs *DwarfRegisters) BP() uint64 {
|
|
return regs.Uint64Val(regs.BPRegNum)
|
|
}
|
|
|
|
// AddReg adds register idx to regs.
|
|
func (regs *DwarfRegisters) AddReg(idx uint64, reg *DwarfRegister) {
|
|
if idx >= uint64(len(regs.Regs)) {
|
|
newRegs := make([]*DwarfRegister, idx+1)
|
|
copy(newRegs, regs.Regs)
|
|
regs.Regs = newRegs
|
|
}
|
|
regs.Regs[idx] = reg
|
|
}
|
|
|
|
func DwarfRegisterFromUint64(v uint64) *DwarfRegister {
|
|
return &DwarfRegister{Uint64Val: v}
|
|
}
|
|
|
|
func DwarfRegisterFromBytes(bytes []byte) *DwarfRegister {
|
|
var v uint64
|
|
switch len(bytes) {
|
|
case 1:
|
|
v = uint64(bytes[0])
|
|
case 2:
|
|
x := binary.LittleEndian.Uint16(bytes)
|
|
v = uint64(x)
|
|
case 4:
|
|
x := binary.LittleEndian.Uint32(bytes)
|
|
v = uint64(x)
|
|
default:
|
|
if len(bytes) >= 8 {
|
|
v = binary.LittleEndian.Uint64(bytes[:8])
|
|
}
|
|
}
|
|
return &DwarfRegister{Uint64Val: v, Bytes: bytes}
|
|
}
|