Remove riscv toolchain (#290)

The Dockerfile contains the executable files and reference emulator, 
instead of a full-fledged container for development.

Author: henrybear327

Dockerfile

@@ -1,34 +1,38 @@
-FROM sysprog21/rv32emu-gcc as base_gcc
 FROM sysprog21/rv32emu-sail as base_sail
 
-FROM ubuntu:22.04 as final
+FROM ubuntu:22.04 as base_gcc
 
-# Install extra packages for the emulator to compile and execute with full capabilities correctly
+# install extra packages for the emulator to compile with full capabilities correctly
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    libsdl2-dev libsdl2-mixer-dev python3-pip git && \
+    build-essential curl git && \
     rm -rf /var/lib/apt/lists/*
 
-RUN python3 -m pip install git+https://github.com/riscv/riscof 
+# copy in the source code
+WORKDIR /home/root/rv32emu
+COPY . .
+
+# generate execution file for rv32emu and rv_histogram
+RUN make
+RUN make tool
+
+FROM ubuntu:22.04 as final
 
 # set up the timezone
 ENV TZ=Asia/Taipei
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
-# copy in the source code
+# copy in elf files and reference emulator
 WORKDIR /home/root/rv32emu
-COPY . .
-
-# Copy the GNU Toolchain files
-ENV RISCV=/opt/riscv
-ENV PATH=$RISCV/bin:$PATH
-COPY --from=base_gcc /opt/riscv/ /opt/riscv/
+COPY ./build/*.elf /home/root/rv32emu/build/
+COPY ./tests/arch-test-target/sail_cSim/riscv_sim_RV32 /home/root/rv32emu/tests/arch-test-target/sail_cSim/
 
 # replace the emulator (riscv_sim_RV32) with the arch that the container can execute 
 RUN rm /home/root/rv32emu/tests/arch-test-target/sail_cSim/riscv_sim_RV32
-COPY --from=base_sail /home/root/riscv_sim_RV32 /home/root/rv32emu/tests/arch-test-target/sail_cSim/riscv_sim_RV32
+COPY --from=base_sail /home/root/riscv_sim_RV32 /home/root/rv32emu/tests/arch-test-target/sail_cSim/
 
-# generate execution file for rv32emu and rv_histogram
-RUN make
-RUN make tool
-ENV PATH=/home/root/rv32emu/build:$PATH
+# get rv32emu and rv_histogram binaries
+COPY --from=base_gcc /home/root/rv32emu/build/rv32emu /home/root/rv32emu/build/rv32emu
+COPY --from=base_gcc /home/root/rv32emu/build/rv_histogram /home/root/rv32emu/build/rv_histogram
+
+ENV PATH=/home/root/rv32emu/build:/home/root/rv32emu/tests/arch-test-target/sail_cSim:$PATH