build static qemu for riscv

Dockerfile

@@ -52,6 +52,18 @@ RUN ./configure --target-list=riscv32-softmmu,riscv64-softmmu \
     && make install \
     && make clean
 
-# TODO: Build qemu with user mode and we would like it to be statically linked
+# DONE: Build qemu with user mode and we would like it to be statically linked
+RUN mkdir -p /opt/qemu-riscv-static \
+    && ./configure --target-list=riscv32-linux-user,riscv64-linux-user \
+    --static \
+    --disable-system \
+    --enable-linux-user \
+    --prefix=/opt/qemu-riscv-static \
+    && make -j $(nproc) \
+    && make install \
+    && make clean
+
+# DONE: Clean all pulled and generated files
+RUN rm -rf /tmp/riscv-qemu-linux && rm -rf /tmp/riscv-gnu-toolchain
 
-# TODO: Clean all pulled and generated files
+WORKDIR /root

README.md

@@ -8,7 +8,7 @@ I was working on a RISC-V ELF CTF challenge. The provided ELF itself was compile
 for SiFive and can be emulated by QEMU, e.g., `qemu-system-riscv32 -nographic -machine sifive_e -kernel xxx.elf`. 
 Of course QEMU can be used as GDB server so I can remote into emulated environment 
 and trace the execution but my GDB just does not support such architecture. I tried 
-to tap into RISC-V brew repository, compile their toolchian and perform and quick 
+to tap into RISC-V brew repository, compile their toolchian and perform a quick 
 remote debug but it just failed. So I looked into rene-fonseca's [docker version RISC-V 
 toolchain](https://github.com/rene-fonseca/docker-riscv) and rewrote into my version.