| # Copyright lowRISC contributors. |
| # Licensed under the Apache License, Version 2.0, see LICENSE for details. |
| # SPDX-License-Identifier: Apache-2.0 |
| # |
| # Generate a baremetal application |
| |
| PROGRAM ?= led |
| PROGRAM_CFLAGS = -Wall -g -Os |
| ARCH = rv32imc |
| # ARCH = rv32im # to disable compressed instructions |
| SRCS = $(PROGRAM).c |
| |
| CC = /tools/riscv/bin/riscv32-unknown-elf-gcc |
| |
| OBJCOPY ?= $(subst gcc,objcopy,$(wordlist 1,1,$(CC))) |
| OBJDUMP ?= $(subst gcc,objdump,$(wordlist 1,1,$(CC))) |
| |
| LINKER_SCRIPT ?= link.ld |
| CRT ?= crt0.S |
| CFLAGS ?= -march=$(ARCH) -mabi=ilp32 -static -mcmodel=medany \ |
| -fvisibility=hidden -nostdlib -nostartfiles $(PROGRAM_CFLAGS) |
| |
| OBJS := ${SRCS:.c=.o} ${CRT:.S=.o} |
| DEPS = $(OBJS:%.o=%.d) |
| |
| OUTFILES = $(PROGRAM).elf $(PROGRAM).vmem $(PROGRAM).bin $(PROGRAM).dis |
| |
| all: $(OUTFILES) |
| |
| $(PROGRAM).elf: $(OBJS) $(LINKER_SCRIPT) |
| $(CC) $(CFLAGS) -T $(LINKER_SCRIPT) $(OBJS) -o $@ $(LIBS) |
| |
| %.dis: %.elf |
| $(OBJDUMP) -SD $^ > $@ |
| |
| # Note: this target requires the srecord package to be installed. |
| # XXX: This could be replaced by objcopy once |
| # https://sourceware.org/bugzilla/show_bug.cgi?id=19921 |
| # is widely available. |
| # XXX: Currently the start address 0x00000000 is hardcoded. It could/should be |
| # read from the elf file, but is lost in the bin file. |
| # Switching to objcopy will resolve that as well. |
| %.vmem: %.bin |
| srec_cat $^ -binary -offset 0x0000 -byte-swap 4 -o $@ -vmem |
| |
| %.bin: %.elf |
| $(OBJCOPY) -O binary $^ $@ |
| |
| %.o: %.c |
| $(CC) $(CFLAGS) -MMD -c $(INCS) -o $@ $< |
| |
| %.o: %.S |
| $(CC) $(CFLAGS) -MMD -c $(INCS) -o $@ $< |
| |
| clean: |
| $(RM) -f *.o *.d |
| |
| distclean: clean |
| $(RM) -f $(OUTFILES) |
