b020632e40
Add a vdso to speed up gettimeofday and clock_getres/clock_gettime for CLOCK_REALTIME/CLOCK_MONOTONIC. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
56 lines
1.6 KiB
Makefile
56 lines
1.6 KiB
Makefile
# List of files in the vdso, has to be asm only for now
|
|
|
|
obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o
|
|
|
|
# Build rules
|
|
|
|
targets := $(obj-vdso64) vdso64.so vdso64.so.dbg
|
|
obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
|
|
|
|
KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
|
|
KBUILD_AFLAGS_64 += -m64 -s
|
|
|
|
KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
|
|
KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
|
|
KBUILD_CFLAGS_64 += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
|
|
$(call ld-option, -Wl$(comma)--hash-style=sysv)
|
|
|
|
$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
|
|
$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
|
|
|
|
obj-y += vdso64_wrapper.o
|
|
extra-y += vdso64.lds
|
|
CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
|
|
|
|
# Force dependency (incbin is bad)
|
|
$(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
|
|
|
|
# link rule for the .so file, .lds has to be first
|
|
$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64)
|
|
$(call if_changed,vdso64ld)
|
|
|
|
# strip rule for the .so file
|
|
$(obj)/%.so: OBJCOPYFLAGS := -S
|
|
$(obj)/%.so: $(obj)/%.so.dbg FORCE
|
|
$(call if_changed,objcopy)
|
|
|
|
# assembly rules for the .S files
|
|
$(obj-vdso64): %.o: %.S
|
|
$(call if_changed_dep,vdso64as)
|
|
|
|
# actual build commands
|
|
quiet_cmd_vdso64ld = VDSO64L $@
|
|
cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $^ -o $@
|
|
quiet_cmd_vdso64as = VDSO64A $@
|
|
cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
|
|
|
|
# install commands for the unstripped file
|
|
quiet_cmd_vdso_install = INSTALL $@
|
|
cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
|
|
|
|
vdso64.so: $(obj)/vdso64.so.dbg
|
|
@mkdir -p $(MODLIB)/vdso
|
|
$(call cmd,vdso_install)
|
|
|
|
vdso_install: vdso64.so
|