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

Dockerfile

@@ -36,20 +36,30 @@ RUN git clone https://github.com/fail0verflow/bootmii-utils.git /build/bootmii-u
     git checkout a32b8f6520d136677213fcbb730035a7e89567e2 && \
     make
 
+RUN git clone https://github.com/nullgemm/doltool.git /build/doltool && \
+    cd /build/doltool && \
+    git checkout 716ca5390bb6467689165db595079e84c80b9b46 && \
+    make
+
 ## final build image
-FROM  ubuntu:${VARIANT}
+FROM ubuntu:${VARIANT}
 ENV DEBIAN_FRONTEND="noninteractive"
 
 RUN apt-get update && \
     apt-get -y install \
         patch ninja-build make bc ccache gcc libncurses-dev \
-        kmod bison flex libssl-dev openssl
+        kmod bison flex libssl-dev openssl binutils-powerpc-linux-gnu
+
+RUN mkdir -p /usr/local/doltool/bin
+ADD makedol.sh /usr/local/doltool/bin/makedol.sh
 
 COPY --from=build /root/x-tools/powerpc-unknown-linux-gnu/ /usr/local/crosstool
 COPY --from=build /build/hbc/channel/wiiload/wiiload /usr/local/crosstool/bin/wiiload
 COPY --from=build /build/bootmii-utils/client/bootmii /usr/local/crosstool/bin/bootmii
+COPY --from=build /build/doltool/doltool /usr/local/doltool/bin/doltool
 
 ENV PATH=/usr/local/crosstool/bin:$PATH
+ENV PATH=/usr/local/doltool/bin:$PATH
 ENV CROSS_COMPILE=powerpc-unknown-linux-gnu-
 ENV CC=powerpc-unknown-linux-gnu-gcc
 ENV ARCH=powerpc

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 ""