#!/bin/bash

# copied from https://themkat.net/2022/12/19/gamecube_linux_sd_boot.html, which itself copied it from the now offline gc-linux wiki
# edited slightly to make it more readable and convenient to use

KSRC=${KSRC:-.}
target=${1:-zImage}
ofile=zImage

[ -r ${KSRC}/arch/powerpc/boot/${target} ] || {
  echo "Can't find target image ${KSRC}/arch/powerpc/boot/${target}"
  exit 1
}

cp ${KSRC}/arch/powerpc/boot/${target} ${ofile}

CROSS=powerpc-linux-gnu-

echo "+ building DOL"
load=$(${CROSS}readelf -l "$ofile" | perl -lane'printf"%08x\n",hex($F[3])+0x80000000 if /LOAD/;')
echo "  LOAD: $load"
entry=$(${CROSS}readelf -l "$ofile" | perl -lane'printf"%08x\n",hex($F[2])+0x80000000 if /Entry point/;')
echo "  EP  : $entry"

${CROSS}objcopy -O binary -R .comment -R .shstrtab -R .symtab -R .strtab -R .gnu.attributes ${ofile} ${ofile}.bin
doltool -c ${ofile}.bin $load $entry
doltool -i ${ofile}.dol
echo ""