Use upstream SoftFloat and unify build system

Replace custom Berkeley SoftFloat 3 package in 'src/softfloat' with the
upstream one. It streamlines build system onfiguration for consistency.

Author: jserv

.github/workflows/main.yml

@@ -232,7 +232,7 @@ jobs:
       if: ${{ always() }}
     - name: undefined behavior test
       run: |
-            make clean && make ENABLE_UBSAN=1 check -j$(nproc)
+            make distclean && make ENABLE_UBSAN=1 check -j$(nproc)
             make ENABLE_JIT=1 clean && make ENABLE_JIT=1 ENABLE_UBSAN=1 check -j$(nproc)
       if: ${{ always() }}
     - name: boot Linux kernel test
@@ -260,22 +260,23 @@ jobs:
     - name: build artifact
       # The GitHub Action for non-x86 CPU
       uses: allinurl/run-on-arch-action@master
-      # FIXME: gcc build fails on Aarch64/Linux hosts
-      env:
-        CC: clang
       with:
         arch: aarch64
         distro: ubuntu24.04
+        githubToken: ${{ github.token }}
         # No 'sudo' is available
         install: |
           apt-get update -q=2
-          apt-get install -q=2 make git clang python3 python3-pip build-essential libsdl2-dev libsdl2-mixer-dev lsb-release wget software-properties-common gnupg bc
+          apt-get install -q=2 make git clang python3 python3-pip python3-venv libsdl2-dev libsdl2-mixer-dev lsb-release wget software-properties-common gnupg bc
           git config --global --add safe.directory ${{ github.workspace }}
           git config --global --add safe.directory ${{ github.workspace }}/src/softfloat
           git config --global --add safe.directory ${{ github.workspace }}/src/mini-gdbstub
           wget https://apt.llvm.org/llvm.sh
           chmod +x ./llvm.sh
           ./llvm.sh 18
+        # FIXME: gcc build fails on Aarch64/Linux hosts  
+        env: |
+          CC: clang-18
         # Append custom commands here
         run: |
           make artifact

.gitmodules

@@ -8,8 +8,7 @@
 	shallow = true
 [submodule "softfloat"]
 	path = src/softfloat
-	url = https://github.com/sysprog21/berkeley-softfloat-3
-	branch = rv32emu
+	url = https://github.com/ucb-bar/berkeley-softfloat-3
 	shallow = true
 [submodule "tests/ansibench"]
 	path = tests/ansibench

Makefile

@@ -114,12 +114,10 @@ AR := ar
 ifeq ("$(CC_IS_EMCC)", "1")
 AR = emar
 endif
-SOFTFLOAT_OUT = $(abspath $(OUT)/softfloat)
-src/softfloat/build/Linux-RISCV-GCC/Makefile:
-	git submodule update --init src/softfloat/
-SOFTFLOAT_LIB := $(SOFTFLOAT_OUT)/softfloat.a
-$(SOFTFLOAT_LIB): src/softfloat/build/Linux-RISCV-GCC/Makefile
-	$(MAKE) -C $(dir $<) BUILD_DIR=$(SOFTFLOAT_OUT) CC=$(CC) AR=$(AR)
+
+# Berkeley SoftFloat
+include mk/softfloat.mk
+
 ifeq ($(call has, SYSTEM), 1)
 DEV_OUT := $(OUT)/devices
 endif
@@ -411,12 +409,13 @@ endif
 
 clean:
 	$(RM) $(BIN) $(OBJS) $(DEV_OBJS) $(BUILD_DTB) $(BUILD_DTB2C) $(HIST_BIN) $(HIST_OBJS) $(deps) $(WEB_FILES) $(CACHE_OUT) src/rv32_jit.c
+	-$(RM) $(SOFTFLOAT_LIB)
 distclean: clean
 	$(RM) -r $(OUT)/id1
 	$(RM) -r $(DEMO_DIR)
 	$(RM) *.zip
 	$(RM) -r $(OUT)/mini-gdbstub
 	-$(RM) $(OUT)/.config
-	-$(RM) -r $(OUT)/softfloat
+	-$(RM) -r $(SOFTFLOAT_DUMMY_PLAT) $(OUT)/softfloat
 
 -include $(deps)