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package proc
import (
"errors"
"fmt"
"math"
"strings"
"github.com/go-delve/delve/pkg/dwarf/op"
)
// Registers is an interface for a generic register type. The
// interface encapsulates the generic values / actions
// we need independent of arch. The concrete register types
// will be different depending on OS/Arch.
type Registers interface {
PC() uint64
SP() uint64
BP() uint64
LR() uint64
TLS() uint64
// GAddr returns the address of the G variable if it is known, 0 and false otherwise
GAddr() (uint64, bool)
Slice(floatingPoint bool) ([]Register, error)
// Copy returns a copy of the registers that is guaranteed not to change
// when the registers of the associated thread change.
Copy() (Registers, error)
}
// Register represents a CPU register.
type Register struct {
Name string
Reg *op.DwarfRegister
}
// AppendUint64Register will create a new Register struct with the name and value
// specified and append it to the `regs` slice.
func AppendUint64Register(regs []Register, name string, value uint64) []Register {
return append(regs, Register{name, op.DwarfRegisterFromUint64(value)})
}
// AppendBytesRegister will create a new Register struct with the name and value
// specified and append it to the `regs` slice.
func AppendBytesRegister(regs []Register, name string, value []byte) []Register {
return append(regs, Register{name, op.DwarfRegisterFromBytes(value)})
}
// ErrUnknownRegister is returned when the value of an unknown
// register is requested.
var ErrUnknownRegister = errors.New("unknown register")
type flagRegisterDescr []flagDescr
type flagDescr struct {
name string
mask uint64
}
var mxcsrDescription flagRegisterDescr = []flagDescr{
{"FZ", 1 << 15},
{"RZ/RN", 1<<14 | 1<<13},
{"PM", 1 << 12},
{"UM", 1 << 11},
{"OM", 1 << 10},
{"ZM", 1 << 9},
{"DM", 1 << 8},
{"IM", 1 << 7},
{"DAZ", 1 << 6},
{"PE", 1 << 5},
{"UE", 1 << 4},
{"OE", 1 << 3},
{"ZE", 1 << 2},
{"DE", 1 << 1},
{"IE", 1 << 0},
}
var eflagsDescription flagRegisterDescr = []flagDescr{
{"CF", 1 << 0},
{"", 1 << 1},
{"PF", 1 << 2},
{"AF", 1 << 4},
{"ZF", 1 << 6},
{"SF", 1 << 7},
{"TF", 1 << 8},
{"IF", 1 << 9},
{"DF", 1 << 10},
{"OF", 1 << 11},
{"IOPL", 1<<12 | 1<<13},
{"NT", 1 << 14},
{"RF", 1 << 16},
{"VM", 1 << 17},
{"AC", 1 << 18},
{"VIF", 1 << 19},
{"VIP", 1 << 20},
{"ID", 1 << 21},
}
func (descr flagRegisterDescr) Mask() uint64 {
var r uint64
for _, f := range descr {
r = r | f.mask
}
return r
}
func (descr flagRegisterDescr) Describe(reg uint64, bitsize int) string {
var r []string
for _, f := range descr {
if f.name == "" {
continue
}
// rbm is f.mask with only the right-most bit set:
// 0001 1100 -> 0000 0100
rbm := f.mask & -f.mask
if rbm == f.mask {
if reg&f.mask != 0 {
r = append(r, f.name)
}
} else {
x := (reg & f.mask) >> uint64(math.Log2(float64(rbm)))
r = append(r, fmt.Sprintf("%s=%x", f.name, x))
}
}
if reg & ^descr.Mask() != 0 {
r = append(r, fmt.Sprintf("unknown_flags=%x", reg&^descr.Mask()))
}
return fmt.Sprintf("%#0*x\t[%s]", bitsize/4, reg, strings.Join(r, " "))
}
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