// readMemoryAligned is a wrapper for ptrace(PTRACE_PEEKTEXT) that attempts to
// make all calls wordsize-aligned. (See comment from writeMemoryAligned)
func (p *Process) readMemoryAligned(where uint64, bytes []byte) (count int, err error) {
p.ensureNotRunning()
wordSize := int(unsafe.Sizeof(uintptr(0)))
whereAligned := where & uint64(^(wordSize - 1))
firstWordOffset := int(where - whereAligned)
lenBytes := len(bytes)
total := 0
wordRead := make([]byte, wordSize)
for i := 0; i < lenBytes; {
cnt, err := syscall.PtracePeekText(p.Pid, uintptr(whereAligned), wordRead)
if err != nil || cnt != wordSize {
panic(err.Error())
return total, err
}
i += copy(bytes[i:lenBytes], wordRead[firstWordOffset:])
firstWordOffset = 0
total = i
}
return total, nil
}
func (t *thread) ptracePeekText(addr uintptr, out []byte) (int, os.Error) {
c, err := syscall.PtracePeekText(t.tid, addr, out)
if traceMem {
fmt.Printf("peek(%#x) => %v, %v\n", addr, out, err)
}
return c, os.NewSyscallError("ptrace(PEEKTEXT)", err)
}
func readStringArg(pid int, addr uintptr) (s string, err error) {
buf := make([]byte, unsafe.Sizeof(addr))
done := false
err = nil
for done == false {
_, err := syscall.PtracePeekText(pid, addr, buf)
if err != nil {
fmt.Printf("Error (ptrace): %v\n", err)
} else {
for b := range buf {
if buf[b] == 0 {
done = true
break
} else {
s += string(buf[b])
if len(s) > 90 {
s += "..."
break
}
}
}
}
addr += unsafe.Sizeof(addr)
}
return s, nil
}
func (pt *Ptrace) Read(b []byte) (n int, err error) {
n, err = syscall.PtracePeekText(pt.Proc.Pid, uintptr(pt.Addr), b)
if err != nil {
return 0, err
}
pt.Addr += uint64(n)
return n, nil
}
func peek(pid int, addr uint64, data []byte) error {
n, err := syscall.PtracePeekText(pid, uintptr(addr), data)
if err != nil {
return err
}
if n != len(data) {
return fmt.Errorf("peek: got %d bytes, want %d", len(data))
}
return nil
}
func readUIntArg(pid int, addr uintptr) (uint64, error) {
buf := make([]byte, unsafe.Sizeof(addr))
_, err := syscall.PtracePeekText(pid, addr, buf)
if err != nil {
fmt.Printf("Error (ptrace): %v\n", err)
return 0, err
} else {
i := binary.LittleEndian.Uint64(buf)
return i, nil
}
return 0, errors.New("Error.")
}
func (s *Server) ptracePeek(pid int, addr uintptr, out []byte) (err error) {
s.fc <- func() error {
n, err := syscall.PtracePeekText(pid, addr, out)
if err != nil {
return err
}
if n != len(out) {
return fmt.Errorf("ptracePeek: peeked %d bytes, want %d", n, len(out))
}
return nil
}
return <-s.ec
}
func readBytesArg(pid int, size int, addr uintptr) (blob []byte, err error) {
buf := make([]byte, unsafe.Sizeof(addr))
err = nil
i := 0
var x uint
x = 0
a := uint(addr)
for i < size {
_, err := syscall.PtracePeekText(pid, uintptr(a+(x*uint(unsafe.Sizeof(addr)))), buf)
if err != nil {
fmt.Printf("Error (ptrace): %v\n", err)
} else {
if (size - i) >= int(unsafe.Sizeof(addr)) {
blob = append(blob, buf...)
} else {
blob = append(blob, buf[:(size-i)]...)
}
i += len(buf)
x++
}
}
return blob, err
}
func (t *Tracer) PeekText(addr uintptr, out []byte) (int, error) {
return syscall.PtracePeekText(t.Process.Pid, addr, out)
}