RUNTIME_DIR = $(CURDIR)/../../../Runtime

include ../../../Scripts/Makefile.configs

OMIT_FRAME_POINTER = no

CFLAGS = -Wall -fPIC -std=c11 -Winline -Wwrite-strings \
	  -fmerge-all-constants -Wstrict-prototypes -Wtrampolines \
	  -Werror=implicit-function-declaration \
	  $(cc-option, -Wnull-dereference) \
	  -fno-stack-protector -fno-builtin -Wno-inline \
	  -I../include -I../../../Pal/lib -I../../../Pal/include/pal \
	  -I../../../Pal/include/elf

EXTRAFLAGS = -Wextra

CFLAGS += $(EXTRAFLAGS)

ifeq ($(OMIT_FRAME_POINTER),yes)
CFLAGS += -DOMIT_FRAME_POINTER=1
else
CFLAGS += -fno-omit-frame-pointer -DOMIT_FRAME_POINTER=0
endif
ASFLAGS	= -Wa,--noexecstack -x assembler-with-cpp -I../include

LDFLAGS	= -shared -nostdlib -z combreloc -z relro -z now -z defs \
	  -dynamic-link=libpal.so \
	  -rpath-link=$(abspath $(RUNTIME_DIR))

ifeq ($(WERROR),1)
CFLAGS += -Werror
endif

files_to_build = libsysdb.a libsysdb.so libsysdb_debug.so
files_to_install = $(addprefix $(RUNTIME_DIR)/,$(files_to_build))

defs	= -DIN_SHIM
CFLAGS += $(defs)
ASFLAGS += $(defs)
fs	= chroot str pipe socket proc dev eventfd
ipcns	= pid sysv
objs	= $(addprefix bookkeep/shim_,handle vma thread signal) \
	  $(addprefix utils/,md5 printf strobjs) \
	  $(addprefix fs/shim_,dcache namei fs_hash fs) \
	  $(foreach f,$(fs),fs/$(f)/fs) \
	  $(addprefix fs/proc/,info ipc-thread thread) \
	  $(addprefix ipc/shim_,ipc ipc_helper ipc_child) \
	  $(addprefix ipc/shim_ipc_,$(ipcns)) \
	  elf/shim_rtld \
	  $(addprefix shim_,init table syscalls checkpoint malloc \
	  async parser debug object) syscallas start \
	  $(addprefix sys/shim_,access alarm benchmark brk clone dup epoll eventfd exec exit fcntl fork fs futex getcwd getpid getrlimit ioctl migrate mmap msgget open pipe poll sched semget sigaction sleep socket stat time uname vfork wait wrappers) \
	  vdso/vdso-data
all_objs = $(objs) vdso/vdso-note vdso/vdso

graphene_lib = .lib/graphene-lib.a
pal_lib = $(RUNTIME_DIR)/libpal-$(PAL_HOST).so

all: $(files_to_build) $(files_to_install)

ifeq ($(DEBUG),1)
CC += -gdwarf-2 -g3
CFLAGS += -DDEBUG
ASFLAGS += -DDEBUG
else
CFLAGS += -O2
endif

ifeq ($(PROFILING), 1)
CFLAGS += -DPROFILE
endif

$(files_to_install): $(RUNTIME_DIR)/%: %
	$(call cmd,ln_sf)

ifeq ($(findstring x86_64,$(SYS))$(findstring linux,$(SYS)),x86_64linux)
LDFLAGS-libsysdb.so += --version-script shim.map -T shim.lds
libsysdb.so: $(addsuffix .o,$(objs)) $(filter %.map %.lds,$(LDFLAGS-$@)) \
	     $(graphene_lib) $(pal_lib)
	$(call cmd,ld_so_o)

LDFLAGS-libsysdb_debug.so += --version-script shim-debug.map -T shim.lds
libsysdb_debug.so: $(addsuffix .o,$(filter-out syscallas,$(objs))) \
		   $(filter %.map %.lds,$(LDFLAGS-$@)) \
		   $(graphene_lib) $(pal_lib)
	$(call cmd,ld_so_o)

.lib/host_endian.h: ../../../Pal/src/host/$(PAL_HOST)/host_endian.h
	@mkdir -p .lib
	$(call cmd,ln_sf)

.PHONY: graphene_lib_recurse
graphene_lib_recurse: .lib/host_endian.h
	$(MAKE) -C ../../../Pal/lib target=$(abspath .lib)/

$(graphene_lib): graphene_lib_recurse
	@true

libsysdb.a: $(addsuffix .o,$(objs))
	$(call cmd,ar_a_o)
else
.IGNORE: $(shim_target)
$(shim_target):
endif

%.o: %.c
	$(call cmd,cc_o_c)

%.i: %.c
	$(call cmd,cpp_i_c)

%.s: %.c
	$(call cmd,cc_s_c)

%.o: %.S
	$(call cmd,as_o_S)

%.s: %.S
	$(call cmd,cpp_s_S)

syscallas.S shim_checkpoint.c: asm-offsets.h

include ../../../Scripts/Makefile.rules

LDFLAGS-vdso/vdso.so.dbg = -nostdlib -shared \
	--hash-style=both --build-id -Bsymbolic \
	-m elf_x86_64 --no-undefined \
	-z max-page-size=4096 -z common-page-size=4096 \
	-T vdso/vdso.lds -soname linux-vdso.so.1
vdso/vdso.so.dbg: LDFLAGS =
vdso/vdso.so.dbg: vdso/vdso.lds vdso/vdso.o vdso/vdso-note.o | vdso/.vdso-no-reloc-checked
	$(call cmd,ld)

# vdso.so is required to have no relocations. This rule checks it.
# Use default linker script to retain relocations if exist.
LDFLAGS-vdso/.vdso-linked-for-reloc-check.so = -nostdlib -shared -Bsymbolic
vdso/.vdso-linked-for-reloc-check.so: LDFLAGS =
vdso/.vdso-linked-for-reloc-check.so: vdso/vdso.o
	$(call cmd,ld)

vdso/.vdso-no-reloc-checked: vdso/.vdso-linked-for-reloc-check.so
	$(call cmd,check_no_reloc)
	$Q touch $@

OBJCOPYFLAGS-vdso/vdso.so = -S
vdso/vdso.so: vdso/vdso.so.dbg
	$(call cmd,objcopy)

vdso/vdso-data.o: vdso/vdso.so
CLEAN_FILES += vdso/vdso.so.dbg vdso/vdso.so vdso/.vdso-linked-for-reloc-check.so vdso/.vdso-no-reloc-checked

.PHONY: clean
clean:
	rm -rf $(addsuffix .o,$(all_objs)) $(addsuffix .d,$(all_objs)) \
	       $(addsuffix .i.d,$(all_objs)) $(addsuffix .s.d,$(all_objs)) \
	       $(shim_target) $(files_to_build) .lib $(CLEAN_FILES)

ifeq ($(filter %clean,$(MAKECMDGOALS)),)
-include $(addsuffix .d,$(all_objs)) $(addsuffix .i.d,$(all_objs)) $(addsuffix .s.d,$(all_objs))
endif

.PHONY: distclean
distclean: clean