#!/usr/bin/env bash

set -e

arch='x86_64'
bdfore=''
kgdb=false
while getopts A:a:b:k OPT; do
  case "$OPT" in
    a)
      arch="$OPTARG"
      ;;
    A)
      after="$OPTARG"
      ;;
    b)
      before="$OPTARG"
      ;;
    k)
      kgdb=true
      ;;
  esac
done
shift "$(($OPTIND - 1))"
if [ "$#" -gt 0 ]; then
  brk="-ex 'break $1'"
  shift
else
  brk=''
fi

buildroot_out_dir="$(pwd)/buildroot/output.${arch}~"
gdb="${buildroot_out_dir}/host/usr/bin/${arch}-linux-gdb $before"
cd "${buildroot_out_dir}/build/linux-custom/"
if "$kgdb"; then
    cmd="$gdb \
      -q \
      -ex 'add-auto-load-safe-path $(pwd)' \
      -ex 'file vmlinux' \
      -ex 'target remote localhost:1234'
    "
else
  case "$arch" in
    'x86_64')
      cmd="$gdb \
-q \
-ex 'add-auto-load-safe-path $(pwd)' \
-ex 'file vmlinux' \
-ex 'set arch i386:x86-64:intel' \
-ex 'target remote localhost:1234' \
$brk \
-ex 'continue' \
-ex 'disconnect' \
-ex 'set arch i386:x86-64' \
-ex 'target remote localhost:1234' \
-ex 'lx-symbols ../kernel_module-1.0/' \
"
    ;;
    'arm'|'aarch64'|'mips64')
      cmd="$gdb \
-q \
-ex 'add-auto-load-safe-path $(pwd)' \
-ex 'file vmlinux' \
-ex 'target remote localhost:1234' \
-ex 'lx-symbols ../kernel_module-1.0/' \
$brk \
"
    ;;
  esac
fi
cmd="$cmd $after"
echo "$cmd"
eval "$cmd"