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- // Copyright 2018 Google Inc. All Rights Reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- // Package arch contains architecture-specific definitions.
- package arch
-
- import (
- "encoding/binary"
- "math"
- )
-
- const MaxBreakpointSize = 4 // TODO
-
- // Architecture defines the architecture-specific details for a given machine.
- type Architecture struct {
- // BreakpointSize is the size of a breakpoint instruction, in bytes.
- BreakpointSize int
- // IntSize is the size of the int type, in bytes.
- IntSize int
- // PointerSize is the size of a pointer, in bytes.
- PointerSize int
- // ByteOrder is the byte order for ints and pointers.
- ByteOrder binary.ByteOrder
- // FloatByteOrder is the byte order for floats.
- FloatByteOrder binary.ByteOrder
- BreakpointInstr [MaxBreakpointSize]byte
- }
-
- func (a *Architecture) Int(buf []byte) int64 {
- return int64(a.Uint(buf))
- }
-
- func (a *Architecture) Uint(buf []byte) uint64 {
- if len(buf) != a.IntSize {
- panic("bad IntSize")
- }
- switch a.IntSize {
- case 4:
- return uint64(a.ByteOrder.Uint32(buf[:4]))
- case 8:
- return a.ByteOrder.Uint64(buf[:8])
- }
- panic("no IntSize")
- }
-
- func (a *Architecture) Int16(buf []byte) int16 {
- return int16(a.Uint16(buf))
- }
-
- func (a *Architecture) Int32(buf []byte) int32 {
- return int32(a.Uint32(buf))
- }
-
- func (a *Architecture) Int64(buf []byte) int64 {
- return int64(a.Uint64(buf))
- }
-
- func (a *Architecture) Uint16(buf []byte) uint16 {
- return a.ByteOrder.Uint16(buf)
- }
-
- func (a *Architecture) Uint32(buf []byte) uint32 {
- return a.ByteOrder.Uint32(buf)
- }
-
- func (a *Architecture) Uint64(buf []byte) uint64 {
- return a.ByteOrder.Uint64(buf)
- }
-
- func (a *Architecture) IntN(buf []byte) int64 {
- if len(buf) == 0 {
- return 0
- }
- x := int64(0)
- if a.ByteOrder == binary.LittleEndian {
- i := len(buf) - 1
- x = int64(int8(buf[i])) // sign-extended
- for i--; i >= 0; i-- {
- x <<= 8
- x |= int64(buf[i]) // not sign-extended
- }
- } else {
- x = int64(int8(buf[0])) // sign-extended
- for i := 1; i < len(buf); i++ {
- x <<= 8
- x |= int64(buf[i]) // not sign-extended
- }
- }
- return x
- }
-
- func (a *Architecture) UintN(buf []byte) uint64 {
- u := uint64(0)
- if a.ByteOrder == binary.LittleEndian {
- shift := uint(0)
- for _, c := range buf {
- u |= uint64(c) << shift
- shift += 8
- }
- } else {
- for _, c := range buf {
- u <<= 8
- u |= uint64(c)
- }
- }
- return u
- }
-
- func (a *Architecture) Uintptr(buf []byte) uint64 {
- if len(buf) != a.PointerSize {
- panic("bad PointerSize")
- }
- switch a.PointerSize {
- case 4:
- return uint64(a.ByteOrder.Uint32(buf[:4]))
- case 8:
- return a.ByteOrder.Uint64(buf[:8])
- }
- panic("no PointerSize")
- }
-
- func (a *Architecture) Float32(buf []byte) float32 {
- if len(buf) != 4 {
- panic("bad float32 size")
- }
- return math.Float32frombits(a.FloatByteOrder.Uint32(buf))
- }
-
- func (a *Architecture) Float64(buf []byte) float64 {
- if len(buf) != 8 {
- panic("bad float64 size")
- }
- return math.Float64frombits(a.FloatByteOrder.Uint64(buf))
- }
-
- func (a *Architecture) Complex64(buf []byte) complex64 {
- if len(buf) != 8 {
- panic("bad complex64 size")
- }
- return complex(a.Float32(buf[0:4]), a.Float32(buf[4:8]))
- }
-
- func (a *Architecture) Complex128(buf []byte) complex128 {
- if len(buf) != 16 {
- panic("bad complex128 size")
- }
- return complex(a.Float64(buf[0:8]), a.Float64(buf[8:16]))
- }
-
- var AMD64 = Architecture{
- BreakpointSize: 1,
- IntSize: 8,
- PointerSize: 8,
- ByteOrder: binary.LittleEndian,
- FloatByteOrder: binary.LittleEndian,
- BreakpointInstr: [MaxBreakpointSize]byte{0xCC}, // INT 3
- }
-
- var X86 = Architecture{
- BreakpointSize: 1,
- IntSize: 4,
- PointerSize: 4,
- ByteOrder: binary.LittleEndian,
- FloatByteOrder: binary.LittleEndian,
- BreakpointInstr: [MaxBreakpointSize]byte{0xCC}, // INT 3
- }
-
- var ARM = Architecture{
- BreakpointSize: 4, // TODO
- IntSize: 4,
- PointerSize: 4,
- ByteOrder: binary.LittleEndian,
- FloatByteOrder: binary.LittleEndian, // TODO
- BreakpointInstr: [MaxBreakpointSize]byte{0x00, 0x00, 0x00, 0x00}, // TODO
- }
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