Add doltool and script to convert linux kernel to .dol executable

makedol.sh

@@ -0,0 +1,28 @@
+#!/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 ""