# -*-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

try = $(shell set -e; if ($(1)) >/dev/null 2>&1; \
	then echo "$(2)"; \
	else echo "$(3)"; fi )

try-cflag = $(call try,$(1) $(2) -x c -c /dev/null -o /dev/null,$(2))

# 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 \
	  -Winit-self \
	  -Wframe-larger-than=1024 \
	  -Werror

# Host tools and options
HOSTCC=gcc
HOSTEND=$(shell uname -m | sed -e 's/^i.*86$$/LITTLE/' -e 's/^x86.*/LITTLE/' -e 's/^ppc64le/LITTLE/' -e 's/^ppc.*/BIG/')
HOSTCFLAGS=-O1 $(CWARNS) -DHAVE_$(HOSTEND)_ENDIAN -MMD
HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-std=gnu11)
HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-m64)
HOSTCFLAGS += $(call try-cflag,$(HOSTCC),-Wjump-misses-init) \
	  $(call try-cflag,$(HOSTCC),-Wsuggest-attribute=const) \
	  $(call try-cflag,$(HOSTCC),-Wsuggest-attribute=noreturn) \
	  $(call try-cflag,$(HOSTCC),-Wstack-usage=1024)
HOSTCFLAGS += -DDEBUG -DCCAN_LIST_DEBUG

HOSTGCOVCFLAGS = -fprofile-arcs -ftest-coverage -lgcov -O0 -g -pg

VALGRIND=valgrind -q --show-reachable=yes --error-exitcode=99

# Target options

OPTS=-Os
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 -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

ifeq ($(DEBUG),1)
CPPFLAGS += -DDEBUG -DCCAN_LIST_DEBUG
endif

CFLAGS := -fno-strict-aliasing -pie -mbig-endian -m64
CFLAGS += -Wl,--oformat,elf64-powerpc
CFLAGS += -ffixed-r13
CFLAGS += $(call try-cflag,$(CC),-std=gnu11)
ifeq ($(ELF_ABI_v2),1)
CFLAGS += $(call try-cflag,$(CC),-mabi=elfv2)
else
CFLAGS += $(call try-cflag,$(CC),-mabi=elfv1)
endif

ifeq ($(DEAD_CODE_ELIMINATION),1)
CFLAGS += -ffunction-sections -fdata-sections
endif

ifeq ($(SKIBOOT_GCOV),1)
CFLAGS += -fprofile-arcs -ftest-coverage -DSKIBOOT_GCOV=1
endif

# Stack protector disabled for now. gcc tends to use the TLS to
# access the canary (depending on how gcc was built), and this won't
# work for us.
#
ifeq ($(STACK_CHECK),1)
#CFLAGS += -fstack-protector-all -pg
CFLAGS += -fno-stack-protector -pg
CPPFLAGS += -DSTACK_CHECK_ENABLED
else
CFLAGS += -fno-stack-protector
#CFLAGS += -fstack-protector
#CFLAGS += $(call try-cflag,$(CC),-fstack-protector-strong)
endif

CFLAGS += $(call try-cflag,$(CC),-Wjump-misses-init) \
	  $(call try-cflag,$(CC),-Wsuggest-attribute=const) \
	  $(call try-cflag,$(CC),-Wsuggest-attribute=noreturn) \
	  $(call try-cflag,$(CC),-Wstack-usage=1024)

CFLAGS += $(CWARNS) $(OPTS) $(DBG)

LDFLAGS := -m64 -static -nostdlib -pie 
LDFLAGS += -Wl,-Ttext-segment,$(LD_TEXT) -Wl,-N -Wl,--build-id=none
LDFLAGS += -Wl,--no-multi-toc
LDFLAGS += -mbig-endian -Wl,--oformat,elf64-powerpc

LDRFLAGS=-melf64ppc
# Debug stuff
#LDFLAGS += -Wl,-v -Wl,-Map,foomap 

ifeq ($(DEAD_CODE_ELIMINATION),1)
LDFLAGS += -Wl,--gc-sections
endif

AFLAGS := -D__ASSEMBLY__ -mbig-endian -m64
ifeq ($(ELF_ABI_v2),1)
AFLAGS += $(call try-cflag,$(CC),-mabi=elfv2)
else
AFLAGS += $(call try-cflag,$(CC),-mabi=elfv1)
endif

# 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 any automatic vector foo
# While it would be safe during boot, we don't save/restore across OPAL calls
CFLAGS += $(call try-cflag,$(CC),-mno-vsx) \
	$(call try-cflag,$(CC),-mno-direct-move) \
	$(call try-cflag,$(CC),-mno-altivec)

# 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

CHECK		= sparse
CHECKFLAGS     := $(CF)
CHECK_CFLAGS_SKIP = -std=gnu11

.SECONDARY:

vpath %.c $(SRC)
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
include $(SRC)/libstb/Makefile.inc

# hack for travis-ci and coverity
gard:
	(cd external/gard; make)

pflash:
	(cd external/pflash; make)

pflash-coverity:
	(cd external/pflash; ./build-all-arch.sh)

all: $(SUBDIRS) $(TARGET).lid $(TARGET).lid.xz $(TARGET).map extract-gcov
all: $(TARGET).lid.stb $(TARGET).lid.xz.stb

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

ALL_OBJS_1 = $(ALL_OBJS) asm/dummy_map.o
ALL_OBJS_2 = $(ALL_OBJS) asm/real_map.o

$(TARGET).lid.xz: $(TARGET).lid
	$(call Q,XZ, cat $^ | xz -9 -C crc32 > $@, $@)

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

$(TARGET).lid.stb: $(TARGET).lid libstb/create-container
	$(call Q,STB-UNSIGNED-CONTAINER,./libstb/create-container $< $@,$@)

$(TARGET).lid.xz.stb: $(TARGET).lid.xz libstb/create-container
	$(call Q,STB-UNSIGNED-CONTAINER,./libstb/create-container $< $@,$@)

$(TARGET).tmp.elf: $(ALL_OBJS_1) $(TARGET).lds $(KERNEL)
	$(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(ALL_OBJS_1) -o $@, $@)

asm/real_map.o : $(TARGET).tmp.map

$(TARGET).elf: $(ALL_OBJS_2) $(TARGET).lds $(KERNEL)
	$(call Q,LD, $(CC) $(LDFLAGS) -T $(TARGET).lds $(ALL_OBJS_2) -o $@, $@)

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

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

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

VERSION ?= $(shell cd $(SRC); GIT_DIR=$(SRC)/.git $(SRC)/make_version.sh)

.PHONY: VERSION-always
.version: VERSION-always
	@echo $(VERSION) > $@.tmp
	@cmp -s $@ $@.tmp || cp $@.tmp $@
	@rm -f $@.tmp

version.c: $(SRC)/make_version.sh $(OBJS_NO_VER) .version
	@(if [ "a$(VERSION)" = "a" ]; then \
		echo "#error You need to set SKIBOOT_VERSION environment variable" > $@ ;\
        else \
                echo "const char version[] = \"$(VERSION)\";" ;\
        fi) > $@

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

extract-gcov: extract-gcov.c
	$(call Q, HOSTCC ,$(HOSTCC) $(HOSTCFLAGS) \
	-DTARGET__GNUC__=`echo '__GNUC__'|$(CC) -E -|grep -v '^#'` \
	-DTARGET__GNUC_MINOR__=`echo '__GNUC_MINOR__'|$(CC) -E -|grep -v '^#'` \
	-Wpadded -O0 -g -I$(SRC) -o $@ $<,$<)

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

skiboot.info: coverage
	lcov -q -c -d . $(LCOV_DIRS) -o $@ --rc lcov_branch_coverage=1
	lcov -q -r $@ $(LCOV_EXCLUDE) -o $@ --rc lcov_branch_coverage=1

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

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

.PHONY: tags TAGS check coverage

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

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

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