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package core
import (
"bytes"
"encoding/binary"
"fmt"
"strconv"
"strings"
"github.com/go-delve/delve/pkg/dwarf/op"
"github.com/go-delve/delve/pkg/elfwriter"
"github.com/go-delve/delve/pkg/proc"
)
func platformFromNotes(notes []*note) (goos, goarch string, err error) {
for _, note := range notes {
if note.Type != elfwriter.DelveHeaderNoteType {
continue
}
lines := strings.Split(string(note.Desc.([]byte)), "\n")
v := strings.Split(lines[0], "/")
if len(v) != 2 {
return "", "", fmt.Errorf("malformed delve header note: %q", string(note.Desc.([]byte)))
}
return v[0], v[1], nil
}
panic("internal error")
}
func threadsFromDelveNotes(p *process, notes []*note) (proc.Thread, error) {
var currentThread proc.Thread
for _, note := range notes {
if note.Type == elfwriter.DelveHeaderNoteType {
buf := bytes.NewBuffer(note.Desc.([]byte))
for {
line, err := buf.ReadString('\n')
if err != nil {
break
}
if len(line) > 0 && line[len(line)-1] == '\n' {
line = line[:len(line)-1]
}
switch {
case strings.HasPrefix(line, elfwriter.DelveHeaderTargetPidPrefix):
pid, err := strconv.ParseUint(line[len(elfwriter.DelveHeaderTargetPidPrefix):], 10, 64)
if err != nil {
return nil, fmt.Errorf("malformed delve header note (bad pid): %v", err)
}
p.pid = int(pid)
case strings.HasPrefix(line, elfwriter.DelveHeaderEntryPointPrefix):
entry, err := strconv.ParseUint(line[len(elfwriter.DelveHeaderEntryPointPrefix):], 0, 64)
if err != nil {
return nil, fmt.Errorf("malformed delve header note (bad entry point): %v", err)
}
p.entryPoint = entry
}
}
}
if note.Type != elfwriter.DelveThreadNodeType {
continue
}
body := bytes.NewReader(note.Desc.([]byte))
th := new(delveThread)
th.regs = new(delveRegisters)
var readerr error
read := func(out interface{}) {
if readerr != nil {
return
}
readerr = binary.Read(body, binary.LittleEndian, out)
}
read(&th.id)
read(&th.regs.pc)
read(&th.regs.sp)
read(&th.regs.bp)
read(&th.regs.tls)
read(&th.regs.hasGAddr)
read(&th.regs.gaddr)
var n uint32
read(&n)
if readerr != nil {
return nil, fmt.Errorf("error reading thread note header for thread %d: %v", th.id, readerr)
}
th.regs.slice = make([]proc.Register, n)
readBytes := func(maxlen uint16, kind string) []byte {
if readerr != nil {
return nil
}
var len uint16
read(&len)
if maxlen > 0 && len > maxlen {
readerr = fmt.Errorf("maximum len exceeded (%d) reading %s", len, kind)
return nil
}
if readerr != nil {
return nil
}
buf := make([]byte, len)
_, readerr = body.Read(buf)
return buf
}
for i := 0; i < int(n); i++ {
name := string(readBytes(20, "register name"))
value := readBytes(2048, "register value")
th.regs.slice[i] = proc.Register{Name: name, Reg: op.DwarfRegisterFromBytes(value)}
if readerr != nil {
return nil, fmt.Errorf("error reading thread note registers for thread %d: %v", th.id, readerr)
}
}
p.Threads[int(th.id)] = &thread{th, p, proc.CommonThread{}}
if currentThread == nil {
currentThread = p.Threads[int(th.id)]
}
}
return currentThread, nil
}
type delveThread struct {
id uint64
regs *delveRegisters
}
func (th *delveThread) ThreadID() int {
return int(th.id)
}
func (th *delveThread) Registers() (proc.Registers, error) {
return th.regs, nil
}
type delveRegisters struct {
pc, sp, bp, tls uint64
hasGAddr bool
gaddr uint64
slice []proc.Register
}
func (regs *delveRegisters) PC() uint64 { return regs.pc }
func (regs *delveRegisters) BP() uint64 { return regs.bp }
func (regs *delveRegisters) SP() uint64 { return regs.sp }
func (regs *delveRegisters) TLS() uint64 { return regs.tls }
func (regs *delveRegisters) GAddr() (uint64, bool) { return regs.gaddr, regs.hasGAddr }
func (regs *delveRegisters) LR() uint64 { return 0 }
func (regs *delveRegisters) Copy() (proc.Registers, error) {
return regs, nil
}
func (regs *delveRegisters) Slice(bool) ([]proc.Register, error) {
return regs.slice, nil
}
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