arch/s390/kernel/vdso64/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 # List of files in the vdso, has to be asm only for now
   3
   4 KCOV_INSTRUMENT := n
   5
   6 obj-vdso64 = gettimeofday.o clock_getres.o clock_gettime.o note.o getcpu.o
   7
   8 # Build rules
   9
  10 targets := $(obj-vdso64) vdso64.so vdso64.so.dbg
  11 obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
  12
  13 KBUILD_AFLAGS += -DBUILD_VDSO
  14 KBUILD_CFLAGS += -DBUILD_VDSO
  15
  16 KBUILD_AFLAGS_64 := $(filter-out -m64,$(KBUILD_AFLAGS))
  17 KBUILD_AFLAGS_64 += -m64 -s
  18
  19 KBUILD_CFLAGS_64 := $(filter-out -m64,$(KBUILD_CFLAGS))
  20 KBUILD_CFLAGS_64 += -m64 -fPIC -shared -fno-common -fno-builtin
  21 KBUILD_CFLAGS_64 += -nostdlib -Wl,-soname=linux-vdso64.so.1 \
  22                         $(call cc-ldoption, -Wl$(comma)--hash-style=both)
  23
  24 $(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_64)
  25 $(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_64)
  26
  27 obj-y += vdso64_wrapper.o
  28 extra-y += vdso64.lds
  29 CPPFLAGS_vdso64.lds += -P -C -U$(ARCH)
  30
  31 # Disable gcov profiling, ubsan and kasan for VDSO code
  32 GCOV_PROFILE := n
  33 UBSAN_SANITIZE := n
  34 KASAN_SANITIZE := n
  35
  36 # Force dependency (incbin is bad)
  37 $(obj)/vdso64_wrapper.o : $(obj)/vdso64.so
  38
  39 # link rule for the .so file, .lds has to be first
  40 $(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) FORCE
  41         $(call if_changed,vdso64ld)
  42
  43 # strip rule for the .so file
  44 $(obj)/%.so: OBJCOPYFLAGS := -S
  45 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  46         $(call if_changed,objcopy)
  47
  48 # assembly rules for the .S files
  49 $(obj-vdso64): %.o: %.S FORCE
  50         $(call if_changed_dep,vdso64as)
  51
  52 # actual build commands
  53 quiet_cmd_vdso64ld = VDSO64L $@
  54       cmd_vdso64ld = $(CC) $(c_flags) -Wl,-T $(filter %.lds %.o,$^) -o $@
  55 quiet_cmd_vdso64as = VDSO64A $@
  56       cmd_vdso64as = $(CC) $(a_flags) -c -o $@ $<
  57
  58 # install commands for the unstripped file
  59 quiet_cmd_vdso_install = INSTALL $@
  60       cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
  61
  62 vdso64.so: $(obj)/vdso64.so.dbg
  63         @mkdir -p $(MODLIB)/vdso
  64         $(call cmd,vdso_install)
  65
  66 vdso_install: vdso64.so