arch/arm/vdso/Makefile

   1 hostprogs-y := vdsomunge
   2
   3 obj-vdso := vgettimeofday.o datapage.o
   4
   5 # Build rules
   6 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
   7 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
   8
   9 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
  10 ccflags-y += -DDISABLE_BRANCH_PROFILING
  11
  12 VDSO_LDFLAGS := -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1
  13 VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
  14 VDSO_LDFLAGS += -nostdlib -shared
  15 VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
  16 VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id)
  17 VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd)
  18
  19 obj-$(CONFIG_VDSO) += vdso.o
  20 extra-$(CONFIG_VDSO) += vdso.lds
  21 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  22
  23 CFLAGS_REMOVE_vdso.o = -pg
  24
  25 # Force -O2 to avoid libgcc dependencies
  26 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
  27 CFLAGS_vgettimeofday.o = -O2
  28
  29 # Disable gcov profiling for VDSO code
  30 GCOV_PROFILE := n
  31
  32 # Force dependency
  33 $(obj)/vdso.o : $(obj)/vdso.so
  34
  35 # Link rule for the .so file
  36 $(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE
  37         $(call if_changed,vdsold)
  38
  39 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
  40         $(call if_changed,vdsomunge)
  41
  42 # Strip rule for the .so file
  43 $(obj)/%.so: OBJCOPYFLAGS := -S
  44 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  45         $(call if_changed,objcopy)
  46
  47 # Actual build commands
  48 quiet_cmd_vdsold = VDSO    $@
  49       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  50                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  51
  52 quiet_cmd_vdsomunge = MUNGE   $@
  53       cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
  54
  55 #
  56 # Install the unstripped copy of vdso.so.dbg.  If our toolchain
  57 # supports build-id, install .build-id links as well.
  58 #
  59 # Cribbed from arch/x86/vdso/Makefile.
  60 #
  61 quiet_cmd_vdso_install = INSTALL $<
  62 define cmd_vdso_install
  63         cp $< "$(MODLIB)/vdso/vdso.so"; \
  64         if readelf -n $< | grep -q 'Build ID'; then \
  65           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
  66           first=`echo $$buildid | cut -b-2`; \
  67           last=`echo $$buildid | cut -b3-`; \
  68           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
  69           ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
  70         fi
  71 endef
  72
  73 $(MODLIB)/vdso: FORCE
  74         @mkdir -p $(MODLIB)/vdso
  75
  76 PHONY += vdso_install
  77 vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso FORCE
  78         $(call cmd,vdso_install)