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