Kernel Debugging

debug.sh

#!/bin/bash

KERNEL_SRC=~/src/linux
MODULE=ahwfs
SSH_HOST=dm
TMP=/tmp/gdb-init



case "$1" in
socat)
	COM_FIFO="$2"
	if [ -z "$COM_FIFO" ]; then
		echo "$0 socat FIFO"
		exit 1
	fi
	sudo socat -d -d "$COM_FIFO" pty
	;;
remote-init)
	ssh "$SSH_HOST" "echo ttyS0,115200 | sudo tee /sys/module/kgdboc/parameters/kgdboc"
	;;
freeze)
	ssh "$SSH_HOST" "echo g | sudo tee /proc/sysrq-trigger"
	;;
gdb-prepare)
	SECTION=`ssh "$SSH_HOST" "cat /sys/module/$MODULE/sections/.text"`
	MODULE_SYMBOLS="`pwd`/$2"
	PTY="$3"
	if [ -z "$PTY" ]; then
		echo "$0 gdb-prepare MODULE_SYMBOLS PTY_ID"
		exit 1
	fi

	cat << EOF > $TMP 
	add-symbol-file "$MODULE_SYMBOLS" "$SECTION"
	set remotebaud 115200
	target remote /dev/pts/$PTY
EOF
	;;
gdb)
	VMLINUX="`pwd`/$2"
	if [ -z "$2" ]; then
		echo "$0 gdb VMLINUX"
		exit 1
	fi
	
	ssh "$SSH_HOST" "echo g | sudo tee /proc/sysrq-trigger" &

	sleep 2

	cd "$KERNEL_SRC"
	sudo gdb -x "$TMP" "$VMLINUX"
	;;

*)
	echo "$0 [socat|remote-init|freeze|gdb|gdb-prepare]"
esac