# Makefile.in COPYRIGHT FUJITSU LIMITED 2016
# @ref.impl arch/arm64/kernel/vdso/Makefile
# Building a vDSO image for AArch64.

HOST_DIR=@KDIR@
HOST_CONFIG=$(HOST_DIR)/.config
HOST_KERNEL_CONFIG_ARM64_4K_PAGES=$(shell grep -E "^CONFIG_ARM64_4K_PAGES=y" $(HOST_CONFIG) | sed 's|CONFIG_ARM64_4K_PAGES=||g')
HOST_KERNEL_CONFIG_ARM64_16K_PAGES=$(shell grep -E "^CONFIG_ARM64_16K_PAGES=y" $(HOST_CONFIG) | sed 's|CONFIG_ARM64_16K_PAGES=||g')
HOST_KERNEL_CONFIG_ARM64_64K_PAGES=$(shell grep -E "^CONFIG_ARM64_64K_PAGES=y" $(HOST_CONFIG) | sed 's|CONFIG_ARM64_64K_PAGES=||g')

VDSOBASE = $(CURDIR)
INCDIR = $(VDSOBASE)/../include
ECHO_SUFFIX = [VDSO]

VDSO_OBJS := gettimeofday.o note.o sigreturn.o
DESTOBJS = $(addprefix $(VDSOBASE)/, $(VDSO_OBJS))

$(if $(VDSOBASE),,$(error IHK output directory is not specified))
$(if $(TARGET),,$(error Target is not specified))

#CFLAGS := -nostdinc -mlittle-endian -Wall -mabi=lp64 -Wa,-gdwarf-2
CFLAGS := -nostdinc -mlittle-endian -Wall -Wa,-gdwarf-2
CFLAGS += -D__KERNEL__ -I$(SRC)/include
CFLAGS += -I$(SRC)/../lib/include -I$(INCDIR) -I$(IHKBASE)/smp/arm64/include
CFLAGS += $(foreach i, $(shell seq 1 100), $(addprefix -DPOSTK_DEBUG_ARCH_DEP_, $(i)))
CFLAGS += $(foreach i, $(shell seq 1 100), $(addprefix -DPOSTK_DEBUG_TEMP_FIX_, $(i)))

LDFLAGS := -nostdinc -mlittle-endian -Wall -Wundef -Wstrict-prototypes
LDFLAGS += -Wno-trigraphs -fno-strict-aliasing -fno-common
LDFLAGS += -Werror-implicit-function-declaration -Wno-format-security
#LDFLAGS += -std=gnu89 -mgeneral-regs-only -mabi=lp64 -O2
LDFLAGS += -std=gnu89 -mgeneral-regs-only -O2
LDFLAGS += -Wframe-larger-than=2048 -fno-stack-protector
LDFLAGS += -fno-delete-null-pointer-checks -Wno-unused-but-set-variable
LDFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
LDFLAGS += -fno-var-tracking-assignments -g -Wdeclaration-after-statement
LDFLAGS += -Wno-pointer-sign -fno-strict-overflow -fconserve-stack
LDFLAGS += -Werror=implicit-int -Werror=strict-prototypes -Werror=date-time
LDFLAGS += -shared -fno-common -fno-builtin -nostdlib
LDFLAGS += -Wl,-soname=linux-vdso.so.1 -Wl,--hash-style=sysv -Wl,-n -Wl,-T
LDFLAGS += --param=allow-store-data-races=0 -DCC_HAVE_ASM_GOTO
LDFLAGS += -D"KBUILD_STR(s)=\#s" -D"KBUILD_BASENAME=KBUILD_STR(vdso.so)"
LDFLAGS += -D"KBUILD_MODNAME=KBUILD_STR(vdso.so)" -D__KERNEL__

DEPSRCS = $(wildcard $(VDSOBASE)/*.c $(VDSOBASE)/*.S)

CFLAGS_lds := -E -P -C -U$(ARCH)
CFLAGS_lds += -nostdinc
CFLAGS_lds += -mlittle-endian
CFLAGS_lds += -D__KERNEL__
CFLAGS_lds += -D__ASSEMBLY__
CFLAGS_lds += -DLINKER_SCRIPT
CFLAGS_lds += -DVDSO_LBASE=0
ifeq ($(HOST_KERNEL_CONFIG_ARM64_4K_PAGES), y)
CFLAGS_lds += -DPAGE_SIZE=0x1000
endif
ifeq ($(HOST_KERNEL_CONFIG_ARM64_16K_PAGES), y)
CFLAGS_lds += -DPAGE_SIZE=0x4000
endif
ifeq ($(HOST_KERNEL_CONFIG_ARM64_64K_PAGES), y)
CFLAGS_lds += -DPAGE_SIZE=0x10000
endif

#load mckernel config (append CPPFLAGS)
include $(IHKBASE)/$(TARGETDIR)/Makefile.predefines

default: all

.PHONY: all clean depend prepare

all: depend $(VDSOBASE)/vdso.so $(INCDIR)/vdso-offsets.h

# Strip rule for the .so file
$(VDSOBASE)/vdso.so: OBJCOPYFLAGS := -S
$(VDSOBASE)/vdso.so: $(VDSOBASE)/vdso.so.dbg
	$(objcopy_cmd)

# Generate VDSO offsets using helper script
$(INCDIR)/vdso-offsets.h: $(VDSOBASE)/vdso.so.dbg
	$(call echo_cmd,VDSOSYM,$<)
	@nm $< | sh gen_vdso_offsets.sh | LC_ALL=C sort > $@

# Link rule for the .so file, .lds has to be first
$(VDSOBASE)/vdso.so.dbg: $(VDSOBASE)/vdso.lds $(DESTOBJS)
	$(ld_cmd)

$(VDSOBASE)/vdso.lds: vdso.lds.S
	$(lds_cmd)

clean:
	$(rm_cmd) $(DESTOBJS) $(VDSOBASE)/Makefile.dep

depend: $(VDSOBASE)/Makefile.dep

$(VDSOBASE)/Makefile.dep:
	$(call dep_cmd,$(DEPSRCS))

prepare:
	@$(RM) $(VDSOBASE)/Makefile.dep

-include $(VDSOBASE)/Makefile.dep

# Actual build commands
ifeq ($(V),1)
echo_cmd =
submake = make
else
echo_cmd = @echo ' ($(TARGET))' $1 $(ECHO_SUFFIX) $2;
submake = make --no-print-directory
endif

cc_cmd = $(call echo_cmd,CC,$<)$(CC) $(CFLAGS) -c -o $@ $<
ld_cmd = $(call echo_cmd,LD,$@)$(CC) $(LDFLAGS) $^ -o $@
dep_cmd = $(call echo_cmd,DEPEND,)$(CC) $(CFLAGS) -MM $1 > $@
rm_cmd = $(call echo_cmd,CLEAN,)$(RM)
objcopy_cmd = $(call echo_cmd,OBJCOPY,$<)$(OBJCOPY) $(OBJCOPYFLAGS) $< $@
lds_cmd = $(call echo_cmd,LDS,$<)$(CC) $(CFLAGS_lds) -c -o $@ $<

.c.o:
	$(cc_cmd)
.S.o:
	$(cc_cmd) -D__ASSEMBLY__