Debugging

May add some of bellow to $HOME/.gdbinit.

set pagination off
set history save on
set history expansion on

GDB With Yocto Project SDK

$ gdbserver --multi 127.0.0.1:5555

set remote exec-file <path to program>
target extended-remote 127.0.0.1:5555

Useful when debugging with the yocto project SDK. May add bellow to $HOME/.gdbinit.

python
import gdb
import os

sysroot = os.environ['SDKTARGETSYSROOT']

solib_search_path = os.environ['SDKTARGETSYSROOT'] + '/usr/' + os.environ['OECORE_BASELIB']
solib_search_path += ':' + os.getcwd() + '/build'

solib_abs_prefix = os.environ['SDKTARGETSYSROOT'] + '/usr/' + os.environ['OECORE_BASELIB']
solib_abs_prefix += ':' + os.getcwd() + '/build'

gdb.execute('set sysroot ' + sysroot)
gdb.execute('set solib-absolute-prefix ' + solib_abs_prefix)
gdb.execute('set solib-search-path ' + solib_search_path)
gdb.execute('set environment LD_LIBRARY_PATH ' + solib_search_path)
end

GDB TUI

Enable terminal user interface (tui). May add bellow to $HOME/.gdbinit.

tui enable
tui new-layout important {-horizontal src 1 asm 1} 2 status 0 {-horizontal cmd 1 regs 1} 2
layout important
tui window width regs -25
focus cmd

For switching gdb terminal user interface windows.

focus asm  # gdb tui assembly window
focus regs # gdb tui register tui window
focus cmd  # gdb tui command window
focus src  # gdb tui source window

GDB Multi-Threading

info threads

thread <number> # Switch to thread
set schedular-locking on
break 120 thread 2

GDB Debug Child Processes (inferior’s)

More information may be found at gdb fork docs.

set follow-fork-mode child
set detach-on-fork off
set schedule-multiple on

detach inferiors
kill inferiors

GDB x Command

Based on gdb x command.

Displays the memory contents at a given address using the specified format.

x [Address expression]
x /[Format] [Address expression]
x /[Length][Format] [Address expression]
x