gb-emu: initial commit

Add a mostly non-functional Gameboy CPU and the skeleton
of a Gameboy assembler intended for unit tests.

Makefile

@@ -0,0 +1,81 @@
+OUT=build
+SRC_DIR=src
+APP_DIR=src/apps/
+
+CC=gcc
+
+CCFLAGS = -Wall -Werror
+CCFLAGS += -std=c99 -D_POSIX_C_SOURCE=200809L
+CCFLAGS += -I$(SRC_DIR)
+
+.PHONY: release debug
+
+CONFIG = $(OUT)/.config.mk
+
+-include $(CONFIG)
+
+ifeq ($(DEBUG), 1)
+CCFLAGS += -DLOG_LEVEL=5 -DDEBUG
+CCFLAGS += -fprofile-arcs -ftest-coverage
+CCFLAGS += -O0 -ggdb
+LDFLAGS += -lgcov --coverage
+endif
+
+ifeq ($(RELEASE), 1)
+CCFLAGS += -O3
+endif
+
+CCFLAGS += -I/usr/include/glib-2.0/ -I/usr/lib/x86_64-linux-gnu/glib-2.0/include
+LDFLAGS += -lglib-2.0
+
+C_SOURCES = $(shell find $(SRC_DIR) -name "*.c")
+ALL_OBJS = $(patsubst $(SRC_DIR)/%.c, $(OUT)/%.o, $(C_SOURCES))
+APP_OBJS = $(filter $(OUT)/apps/%, $(ALL_OBJS))
+OBJS = $(filter-out $(APP_OBJS), $(ALL_OBJS))
+APPS = $(patsubst %.o, %, $(APP_OBJS))
+
+.PHONY: all
+all: gbdb gbasm tests
+
+.PHONY: config-debug config-release config-default
+$(CONFIG):
+	@mkdir -p $(OUT)
+config-debug: $(CONFIG)
+	@echo "DEBUG=1" > $(CONFIG)
+config-release: $(CONFIG)
+	@echo "RELEASE=1" > $(CONFIG)
+config-default: $(CONFIG)
+	@echo "" > $(CONFIG)
+
+
+.PHONY: gbdb gbasm
+
+gbdb: $(OUT)/apps/gbdb
+gbasm: $(OUT)/apps/gbasm
+
+.PHONY: gbasm-test sample-test tests
+
+gbasm-test: $(OUT)/apps/gbasm-test
+sample-test: $(OUT)/apps/sample-test
+tri-test: $(OUT)/apps/tri-test
+tests: gbasm-test sample-test tri-test
+
+$(ALL_APPS) $(ALL_OBJS): $(CONFIG)
+
+$(OUT)/%.o: $(SRC_DIR)/%.c
+	@echo "     CC $@"
+	@$(shell mkdir -p $(@D))
+	@$(CC) -c $(CCFLAGS) -o $@ $<
+
+.SECONDEXPANSION:
+$(APPS): $(OBJS) $$@.o
+	@echo "     LD $@"
+	@$(shell mkdir -p $(@D))
+	@$(CC) $^ $(LDFLAGS) -o $@
+
+.PHONY: clean realclean
+clean:
+	@rm -f $(ALL_OBJS) $(APPS)
+
+realclean: clean
+	@rm -f $(CONFIG)