# gdb

* `finish`  print return value of current function
* `step` next source line
* `stepi` one machine instruction
* `next` same as `step` but skip function
* `nexti` same as `stepi` but skip function

`info registers`

## attach to running process

`echo 0 > /proc/sys/kernel/yama/ptrace_scope` 

`thread apply all bt`

## remote debugging

* on remote site:

```
gdbserver --attach :10000 <pid>
```

* on local site:

```
arm-linux-gnueabihf-gdb -x sysroot-file.gdbinit -ex 'target extended-remote <remoteip>:10000' -ex 'set remote exec-file <remote binary>' --args <local binary with debug>
```