35d4f05c4e
Moves the implementation of Registers.Get out of the backends and into proc where it can be implemented only once per architecture.
127 lines
3.0 KiB
Go
127 lines
3.0 KiB
Go
package proc
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import (
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"errors"
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"fmt"
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"math"
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"strings"
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"github.com/go-delve/delve/pkg/dwarf/op"
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)
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// Registers is an interface for a generic register type. The
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// interface encapsulates the generic values / actions
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// we need independent of arch. The concrete register types
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// will be different depending on OS/Arch.
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type Registers interface {
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PC() uint64
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SP() uint64
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BP() uint64
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TLS() uint64
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// GAddr returns the address of the G variable if it is known, 0 and false otherwise
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GAddr() (uint64, bool)
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Slice(floatingPoint bool) ([]Register, error)
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// Copy returns a copy of the registers that is guaranteed not to change
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// when the registers of the associated thread change.
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Copy() (Registers, error)
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}
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// Register represents a CPU register.
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type Register struct {
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Name string
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Reg *op.DwarfRegister
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}
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// AppendUint64Register will create a new Register struct with the name and value
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// specified and append it to the `regs` slice.
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func AppendUint64Register(regs []Register, name string, value uint64) []Register {
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return append(regs, Register{name, op.DwarfRegisterFromUint64(value)})
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}
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// AppendBytesRegister will create a new Register struct with the name and value
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// specified and append it to the `regs` slice.
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func AppendBytesRegister(regs []Register, name string, value []byte) []Register {
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return append(regs, Register{name, op.DwarfRegisterFromBytes(value)})
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}
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// ErrUnknownRegister is returned when the value of an unknown
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// register is requested.
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var ErrUnknownRegister = errors.New("unknown register")
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type flagRegisterDescr []flagDescr
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type flagDescr struct {
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name string
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mask uint64
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}
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var mxcsrDescription flagRegisterDescr = []flagDescr{
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{"FZ", 1 << 15},
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{"RZ/RN", 1<<14 | 1<<13},
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{"PM", 1 << 12},
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{"UM", 1 << 11},
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{"OM", 1 << 10},
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{"ZM", 1 << 9},
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{"DM", 1 << 8},
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{"IM", 1 << 7},
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{"DAZ", 1 << 6},
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{"PE", 1 << 5},
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{"UE", 1 << 4},
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{"OE", 1 << 3},
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{"ZE", 1 << 2},
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{"DE", 1 << 1},
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{"IE", 1 << 0},
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}
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var eflagsDescription flagRegisterDescr = []flagDescr{
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{"CF", 1 << 0},
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{"", 1 << 1},
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{"PF", 1 << 2},
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{"AF", 1 << 4},
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{"ZF", 1 << 6},
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{"SF", 1 << 7},
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{"TF", 1 << 8},
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{"IF", 1 << 9},
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{"DF", 1 << 10},
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{"OF", 1 << 11},
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{"IOPL", 1<<12 | 1<<13},
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{"NT", 1 << 14},
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{"RF", 1 << 16},
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{"VM", 1 << 17},
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{"AC", 1 << 18},
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{"VIF", 1 << 19},
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{"VIP", 1 << 20},
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{"ID", 1 << 21},
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}
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func (descr flagRegisterDescr) Mask() uint64 {
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var r uint64
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for _, f := range descr {
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r = r | f.mask
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}
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return r
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}
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func (descr flagRegisterDescr) Describe(reg uint64, bitsize int) string {
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var r []string
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for _, f := range descr {
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if f.name == "" {
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continue
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}
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// rbm is f.mask with only the right-most bit set:
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// 0001 1100 -> 0000 0100
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rbm := f.mask & -f.mask
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if rbm == f.mask {
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if reg&f.mask != 0 {
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r = append(r, f.name)
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}
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} else {
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x := (reg & f.mask) >> uint64(math.Log2(float64(rbm)))
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r = append(r, fmt.Sprintf("%s=%x", f.name, x))
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}
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}
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if reg & ^descr.Mask() != 0 {
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r = append(r, fmt.Sprintf("unknown_flags=%x", reg&^descr.Mask()))
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}
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return fmt.Sprintf("%#0*x\t[%s]", bitsize/4, reg, strings.Join(r, " "))
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}
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