3.6.2. GDB step debug userland BusyBox init
BusyBox custom init process:
-
Shell 1:
./run --gdb-wait --kernel-cli 'init=/bin/ls'
-
Shell 2:
./run-gdb --userland "$(./getvar buildroot_build_build_dir)"/busybox-*/busybox ls_main
This follows BusyBox' convention of calling the main for each executable as <exec>_main since the busybox executable has many "mains".
BusyBox default init process:
-
Shell 1:
./run --gdb-wait
-
Shell 2:
./run-gdb --userland "$(./getvar buildroot_build_build_dir)"/busybox-*/busybox init_main
init cannot be debugged with gdbserver without modifying the source, or else /sbin/init exits early with:
"must be run as PID 1"