rework structure

bare-metal-bsp/env/common-gcc.mk

@@ -0,0 +1,74 @@
+ifndef _MK_COMMON
+_MK_COMMON := # defined
+
+.PHONY: all
+all: $(TARGET)
+
+include $(BSP_BASE)/libwrap/libwrap.mk
+
+BOARD?=iss
+ENV_DIR = $(BSP_BASE)/env
+PLATFORM_DIR = $(ENV_DIR)/$(BOARD)
+
+ASM_SRCS += $(ENV_DIR)/start.S
+ASM_SRCS += $(ENV_DIR)/entry.S
+C_SRCS += $(PLATFORM_DIR)/init.c
+
+LINKER_SCRIPT := $(PLATFORM_DIR)/$(LINK_TARGET).lds
+
+INCLUDES += -I$(BSP_BASE)/include
+INCLUDES += -I$(BSP_BASE)/drivers/
+INCLUDES += -I$(ENV_DIR)
+INCLUDES += -I$(PLATFORM_DIR)
+
+TOOL_DIR ?= $(BSP_BASE)/../toolchain/bin/
+
+LDFLAGS += -march=$(RISCV_ARCH) -mabi=$(RISCV_ABI)
+LDFLAGS += -T $(LINKER_SCRIPT) -Wl,-Map=$(TARGET).map  -nostartfiles
+LDFLAGS += -L$(ENV_DIR)
+# --specs=nano.specs
+
+ASM_OBJS := $(ASM_SRCS:.S=.o)
+C_OBJS   := $(C_SRCS:.c=.o)
+CXX_OBJS := $(CXX_SRCS:.cpp=.o)
+
+LINK_OBJS += $(ASM_OBJS) $(C_OBJS) $(CXX_OBJS)
+LINK_DEPS += $(LINKER_SCRIPT)
+
+CLEAN_OBJS += $(TARGET) $(LINK_OBJS)
+
+GCCVERSION = $(shell $(CC) --version | grep gcc | awk '{print($NF);}')
+ifeq ($(GCCVERSION),9.2)
+  CFLAGS += -march=$(RISCV_ARCH)
+else
+  CFLAGS += -march=$(RISCV_ARCH)_zicsr_zifencei
+endif
+CFLAGS += -mabi=$(RISCV_ABI)
+CFLAGS += -mcmodel=medany
+
+TRIPLET?=riscv64-unknown-elf
+CXX=$(TOOL_DIR)$(TRIPLET)-c++
+CC=$(TOOL_DIR)$(TRIPLET)-gcc
+LD=$(TOOL_DIR)$(TRIPLET)-gcc
+AR=$(TOOL_DIR)$(TRIPLET)-ar
+OBJDUMP := $(TOOL_DIR)$(TRIPLET)-objdump
+
+
+$(TARGET): $(LINK_OBJS) $(LINK_DEPS)
+	$(LD) $(LINK_OBJS) $(LDFLAGS) $(LIBWRAP) -o $@
+	$(OBJDUMP) -d -S $(TARGET) > $(TARGET).dis
+	
+$(ASM_OBJS): %.o: %.S $(HEADERS)
+	$(CC) $(CFLAGS) $(INCLUDES) -c -o $@ $<
+
+$(C_OBJS): %.o: %.c $(HEADERS)
+	$(CC) $(CFLAGS) $(INCLUDES) -include sys/cdefs.h -c -o $@ $<
+
+$(CXX_OBJS): %.o: %.cpp $(HEADERS)
+	$(CXX) $(CFLAGS) $(CXXFLAGS) $(INCLUDES) -include sys/cdefs.h -c -o $@ $<
+
+.PHONY: clean
+clean:
+	rm -f $(CLEAN_OBJS) $(LIBWRAP)
+
+endif