# -*-Makefile-*-
#
# This is the main Makefile

# Target tools
CC=$(CROSS)gcc$(POSTFIX)
LD=$(CROSS)ld$(POSTFIX)
AS=$(CROSS)as
AR=$(CROSS)ar
NM=$(CROSS)nm
OBJCOPY=$(CROSS)objcopy
OBJDUMP=$(CROSS)objdump
SIZE=$(CROSS)size
LD_TEXT=0x0
NM += --synthetic

# Base warnings
CWARNS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
	  -Werror-implicit-function-declaration -Wdeclaration-after-statement \
	  -Wno-pointer-sign -Wextra -Wno-sign-compare \
	  -Wmissing-prototypes -Wmissing-declarations \
	  -Wwrite-strings -Wcast-align -Wjump-misses-init \
	  -Winit-self \
	  -Wsuggest-attribute=const \
	  -Wsuggest-attribute=noreturn \
	  -Wframe-larger-than=2048 \
	  -Wstack-usage=4096

# Host tools and options
HOSTCC=gcc
HOSTEND=$(shell uname -m | sed -e 's/^i.*86$$/LITTLE/' -e 's/^x86.*/LITTLE/' -e 's/^ppc.*/BIG/')
HOSTCFLAGS=-O1 $(CWARNS) -DHAVE_$(HOSTEND)_ENDIAN
VALGRIND=valgrind -q --show-reachable=yes --error-exitcode=99

# Target options

OPTS=-Os -ffunction-sections
DBG=-g

CPPFLAGS := -I$(SRC)/include -Iinclude -MMD -include $(SRC)/include/config.h
CPPFLAGS += -I$(SRC)/libfdt -I$(SRC)/libflash -I$(SRC)/libc/include -I$(SRC)
ifeq ($(PORE),1)
CPPFLAGS += -I$(SRC)/libpore -D__HAVE_LIBPORE__
endif
CPPFLAGS += -D__SKIBOOT__ -nostdinc
CPPFLAGS += -isystem $(shell $(CC) -print-file-name=include)
CPPFLAGS += -DBITS_PER_LONG=64 -m64 -DHAVE_BIG_ENDIAN
# We might want to remove our copy of stdint.h
# but that means uint64_t becomes an ulong instead of an ullong
# causing all our printf's to warn
CPPFLAGS += -ffreestanding

CFLAGS := -fno-strict-aliasing -fno-stack-protector -pie
CFLAGS += $(CWARNS) $(OPTS) $(DBG)

LDFLAGS := -m64 -static -nostdlib -Wl,--gc-sections -pie
LDFLAGS += -Wl,-Ttext-segment,$(LD_TEXT) -Wl,-N -Wl,--build-id=none
LDFLAGS += -Wl,--no-multi-toc
LDRFLAGS=-melf64ppc
# Debug stuff
#LDFLAGS += -Wl,-v -Wl,-Map,foomap 

AFLAGS := -D__ASSEMBLY__ 

# Special tool flags:
# Do not use the floating point unit
CFLAGS += -msoft-float
# Do not use string instructions
CFLAGS += -mno-string
# do not use load/store multiple word instrcutions
CFLAGS += -mno-multiple
# Do not use load/store update. You REALLY do not want to use this!
# The async safety of the ABI stack depends on the atomicity
# of update on store.
#CFLAGS += -mno-update

ifneq ($(KERNEL),)
CPPFLAGS += -DBUILTIN_KERNEL="$(KERNEL)"
endif

.SECONDARY:

vpath %.c $(SRC)
vpath %.S $(SRC)

default: all

include/asm-offsets.h: asm/asm-offsets.s
	@mkdir -p include
	$(call Q,GN, $(SRC)/make_offsets.sh $< >$@, $@)

TARGET = skiboot

include $(SRC)/asm/Makefile.inc
include $(SRC)/core/Makefile.inc
include $(SRC)/hw/Makefile.inc
include $(SRC)/platforms/Makefile.inc
include $(SRC)/libfdt/Makefile.inc
include $(SRC)/libflash/Makefile.inc
include $(SRC)/libpore/Makefile.inc
include $(SRC)/libc/Makefile.inc
include $(SRC)/ccan/Makefile.inc
include $(SRC)/$(DEVSRC)/Makefile.inc

all: $(SUBDIRS) $(TARGET).lid $(TARGET).map

OBJS := $(ASM) $(CORE) $(HW) $(PLATFORMS) $(LIBFDT) $(LIBFLASH)
ifeq ($(PORE),1)
OBJS += $(LIBPORE)
endif
OBJS += $(LIBC) $(CCAN) $(DEVSRC_OBJ) gitid.o

$(TARGET).lid: $(TARGET).elf
	$(call Q,OBJCOPY, $(OBJCOPY) -O binary -S $^ $@, $@)

$(TARGET).elf: $(OBJS) $(TARGET).lds $(KERNEL)
	$(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(OBJS) -o $@, $@)

$(TARGET).map: $(TARGET).elf
	$(call Q,NM, $(NM) -n $< | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > $@, $@)

$(SUBDIRS):
	$(call Q,MKDIR,mkdir $@, $@)

-include $(wildcard *.d)
-include $(wildcard $(SUBDIRS:%=%/*.d))

# Set V=1 if you want to see everything.
include $(SRC)/Makefile.rules

GIT_SHA ?= $(shell cd $(SRC); GIT_DIR=$(SRC)/.git git describe --always --dirty 2> /dev/null)

gitid.c:
	@echo "const char gitid[] = \"$(GIT_SHA)\";" > $@

.PHONY: coverage
include $(shell find $(SRC)/* -name Makefile.check)

coverage-report: skiboot.info
	genhtml -q -o $@ $<

skiboot.info: coverage
	lcov -q -c -d . -o $@


tags:
	find . -name '*.[chS]' | xargs ctags

TAGS:
	find . -name '*.[chS]' | xargs etags

.PHONY: tags TAGS check gitid.c

cscope:
	find . -name '*.[chS]' | xargs cscope

clean:
	$(RM) *.[odsa] $(SUBDIRS:%=%/*.[odsa])
	$(RM) $(TARGET).elf $(TARGET).lid $(TARGET).map $(TARGET).lds
	$(RM) include/asm-offsets.h gitid.c

distclean: clean
	$(RM) *~ $(SUBDIRS:%=%/*~) include/*~