Makefile.common

# Following must be defined in including
# makefile!

ifndef ARCH
  $(error ARCH is not defined, please define prior inclusion)
endif
ifndef GEM5_ARCH
  $(error GEM5_ARCH is not defined, please define prior inclusion)
endif

# Following should be set too, but defaulting to
# $(ARCH) seems to be good too.
QEMU_ARCH		?= $(ARCH)


# From now on, nothing should not need to be modified, defaults
# should do. Local modifications/overides should go to
# Makefile.local (most importantly, definition of GEM5_DIR)
# See ../../Makefile.local rule below.


# Name of the produced binary, defaults to directory name
BINARY ?= $(shell basename $(shell dirname $(shell pwd))).elf

# Cross-compiler toolchain prefix
CROSS?=$(ARCH)-linux-gnu-

# Tools
AS=$(CROSS)as
LD=$(CROSS)ld
GDB?=gdb
QEMU ?= qemu-$(QEMU_ARCH)-static

ASFLAGS ?=
LDFLAGS ?=

# Automagically add -T Link if linker script named `Link`
# is found
ifneq (,$(wildcard Link))
	LDFLAGS+=-T Link
endif

# Commands
GDB_CMD=$(GDB) \
        -ex "target remote :7000" \
        --args $(shell realpath $(BINARY))
GEM5_SEPY		?= $(GEM5_DIR)/configs/deprecated/example/se.py
GEM5_DEBUG_FLAGS?=--debug-flags=Exec
GEM5_CMD = $(GEM5_DIR)/build/$(GEM5_ARCH)/gem5.debug \
		   $(GEM5_DEBUG_FLAGS) \
		   $(GEM5_SEPY) \
		   -c $(BINARY) --wait-gdb \
		   --param 'system.shared_backstore = "/gem5"'
QEMU_CMD = $(QEMU) -g 7000 $(BINARY)

default: $(BINARY)

$(dir $(lastword $(MAKEFILE_LIST)))Makefile.local:
	@echo "GEM5_DIR ?= \$$(error GEM5_DIR not defined, please define in \$$(shell realpath ../../Makefile.local) )" >> $@
	@echo "" >> $@
	@echo "# Other tunables" >> $@
	@echo "" >> $@
	@echo "# GEM5_DEBUG_FLAGS ?=\"--debug-flags=Fetch,Decode\"" >> $@
	@echo "# GEM5_SEPY		    ?= $(GEM5_DIR)/configs/example/se.py" >> $@
	@echo "# GDB              ?= gdb" >> $@
	@echo "# QEMU             ?= qemu-$(QEMU_ARCH)-static" >> $@

-include $(dir $(lastword $(MAKEFILE_LIST)))Makefile.local

%.elf: %.o
	$(LD) $(LDFLAGS) -static -o $@ $<

%.o: %.s
	$(AS) $(ASFLAGS) -g -o $@ $<

.PHONY:: show-g5 run-g5, g5

show-g5: $(BINARY)
	echo $(GEM5_CMD)

run-g5, g5: $(BINARY)
	$(GEM5_CMD)

.PHONY:: show-gdb run-gdb, gdb

show-gdb: $(BINARY)
	echo $(GDB_CMD)

run-gdb, gdb: $(BINARY)
	$(GDB_CMD)

.PHONY:: show-qemu run-qemu, qemu

show-qemu:
	echo $(QEMU_CMD)

run-qemu, qemu: $(BINARY)
	$(QEMU_CMD)

clean:
	rm -f $(BINARY) *.o
	rm -rf m5out