makefile -> Makefile

Makefile

@@ -0,0 +1,92 @@
+# Compiler and assembler
+CROSS=riscv64-linux-gnu
+CC = 		${CROSS}-gcc
+AS = 		${CROSS}-as
+LD = 		${CROSS}-ld
+OBJDUMP = 	${CROSS}-objdump
+SIZE = 		${CROSS}-size
+
+# Specify the target binary (call it whatever)
+TARGET = bin.elf
+
+# QEMU command and flags
+# QEMU = qemu-riscv64-static
+QEMU = qemu-system-riscv64
+QEMU_FLAGS += --machine virt#	# Use the virt machine
+QEMU_FLAGS += --nographic#		# No graphical output
+
+# Flags for compiler and assembler
+CFLAGS += -static#				# Use static linking
+CFLAGS += -nostartfiles# 		# Do not use standard startup files
+CFLAGS += -nostdlib#			# Do not use standard libraries
+CFLAGS += -fno-builtin#			# Do not use built-in functions
+CFLAGS += -fno-common#			# Do not use common sections
+CFLAGS += -march=rv64i#			# Use RV64I ISA, i.e., integer only
+CFLAGS += -mabi=lp64#			# Use LP64 ABI, i.e., 64-bit longs and pointers, 32-bit ints
+CFLAGS += -Os#					# Optimize for size
+
+LDFLAGS += -T link.ld			# Use the linker script
+LDFLAGS += --no-dynamic-linker
+LDFLAGS += -m elf64lriscv
+LDFLAGS += -static
+LDFLAGS += -nostdlib
+LDFLAGS += -s
+
+# Use GC=0 to disable garbage collection
+ifneq ($(GC), 0)
+	CFLAGS += -ffreestanding
+	CFLAGS += -ffunction-sections -fdata-sections
+	CFLAGS += -Wl,--gc-sections
+endif
+
+# Debugging flags, passed as 'make DEBUG=1 <target>'
+ifeq ($(DEBUG), 1)
+	CFLAGS += -g -O0
+endif
+
+# Assembly source files
+AS_SRCS := $(wildcard *.s)
+
+# Object files
+OBJS := $(AS_SRCS:.s=.o)
+
+# Default target
+all: $(OBJS)
+	@$(LD) $(LDFLAGS) -o $(TARGET) $(OBJS)
+	@echo "LD $(OBJS)"
+
+# Compile assembly sources
+%.o: %.s
+	@$(CC) $(CFLAGS) -c -o $@ $<
+	@echo "CC $<"
+
+# Run the binary in QEMU
+run: all	
+	@echo "To exit: Ctrl+A, X"
+	@$(QEMU) $(QEMU_FLAGS) -bios $(TARGET)
+
+# View the text section of the binary
+inspect: all
+	$(OBJDUMP) -dC $(TARGET)
+
+sections: all
+	$(OBJDUMP) -h $(TARGET)
+
+# View the disassembly
+raw: all
+	$(OBJDUMP) -D $(TARGET)
+
+# View the data section
+data: all
+	$(OBJDUMP) -s $(TARGET) --section=.data
+
+# Check the size of the compiled binary
+size: all
+	$(SIZE) $(TARGET)
+
+format:
+	clang-format -i *.s
+
+# Clean up
+clean:
+	rm -f $(TARGET) $(OBJS)