Improve Nim remote GDB debugging

binaries/nim/README.md

@@ -1,10 +1,14 @@
-### Nim RISC-V program example
+## Nim RISC-V program example
 
 The program is designed to print a JSON structure and then crash.
 The signal handlers will show the backtrace as long as debug info is added.
 
-## Requirements
+### Requirements
 
 You will need to have Nim in your PATH.
 
 Install gcc-10-riscv64-linux-gnu to be able build the Nim program for RISC-V.
+
+### Debugging
+
+Run `bash debug.sh` to start remotely debugging with GDB. You will need to build the RISC-V GDB from the RISC-V GNU toolchain, as it is not provided by any distro that I know of.

binaries/nim/build.sh

@@ -16,10 +16,17 @@ NIM_LIBS=`whereis nim`
 NIM_LIBS="${NIM_LIBS##*: }"
 NIM_LIBS="${NIM_LIBS/bin*/lib}"
 
-nim c --nimcache:$NIMCACHE $NIMCPU --colors:on --os:linux --gc:arc -d:useMalloc=true -d:debug -c ${NIMFILE}
-jq '.compile[] [0]' $NIMCACHE/*.json > buildfiles.txt
+if [[ -z "${DEBUG}" ]]; then
+	nim c --nimcache:$NIMCACHE $NIMCPU --colors:on --os:linux --gc:arc -d:useMalloc=true -d:release -c ${NIMFILE}
+	jq '.compile[] [0]' $NIMCACHE/*.json > buildfiles.txt
 
-cmake .. -DGCC_TRIPLE=$GCC_TRIPLE -DNIM_LIBS=$NIM_LIBS -DCMAKE_BUILD_TYPE=Release
+	cmake .. -DGCC_TRIPLE=$GCC_TRIPLE -DNIM_LIBS=$NIM_LIBS -DCMAKE_BUILD_TYPE=Release -DDEBUGGING=OFF
+else
+	nim c --nimcache:$NIMCACHE $NIMCPU --colors:on --os:linux --gc:arc -d:useMalloc=true --debugger=native -c ${NIMFILE}
+	jq '.compile[] [0]' $NIMCACHE/*.json > buildfiles.txt
+
+	cmake .. -DGCC_TRIPLE=$GCC_TRIPLE -DNIM_LIBS=$NIM_LIBS -DCMAKE_BUILD_TYPE=Debug -DDEBUGGING=ON
+fi
 make -j4
 popd
 

binaries/nim/debug.gdb

@@ -0,0 +1,2 @@
+file riscv64-linux-gnu/hello
+target remote localhost:2159

binaries/nim/debug.sh

@@ -0,0 +1,6 @@
+export DEBUG=1
+source build.sh
+echo "=================================="
+echo " Start emulator with DEBUG=1 now. "
+echo "=================================="
+riscv64-unknown-linux-gnu-gdb -x debug.gdb