arch/arm/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 hostprogs-y := vdsomunge
   3
   4 obj-vdso := vgettimeofday.o datapage.o
   5
   6 # Build rules
   7 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
   8 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
   9
  10 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
  11 ccflags-y += -DDISABLE_BRANCH_PROFILING
  12
  13 VDSO_LDFLAGS := -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1
  14 VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096
  15 VDSO_LDFLAGS += -nostdlib -shared
  16 VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
  17 VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id)
  18 VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd)
  19
  20 obj-$(CONFIG_VDSO) += vdso.o
  21 extra-$(CONFIG_VDSO) += vdso.lds
  22 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  23
  24 CFLAGS_REMOVE_vdso.o = -pg
  25
  26 # Force -O2 to avoid libgcc dependencies
  27 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
  28 CFLAGS_vgettimeofday.o = -O2
  29
  30 # Disable gcov profiling for VDSO code
  31 GCOV_PROFILE := n
  32
  33 # Force dependency
  34 $(obj)/vdso.o : $(obj)/vdso.so
  35
  36 # Link rule for the .so file
  37 $(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE
  38         $(call if_changed,vdsold)
  39
  40 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
  41         $(call if_changed,vdsomunge)
  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 # Actual build commands
  49 quiet_cmd_vdsold = VDSO    $@
  50       cmd_vdsold = $(CC) $(c_flags) $(VDSO_LDFLAGS) \
  51                    -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@
  52
  53 quiet_cmd_vdsomunge = MUNGE   $@
  54       cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
  55
  56 #
  57 # Install the unstripped copy of vdso.so.dbg.  If our toolchain
  58 # supports build-id, install .build-id links as well.
  59 #
  60 # Cribbed from arch/x86/vdso/Makefile.
  61 #
  62 quiet_cmd_vdso_install = INSTALL $<
  63 define cmd_vdso_install
  64         cp $< "$(MODLIB)/vdso/vdso.so"; \
  65         if readelf -n $< | grep -q 'Build ID'; then \
  66           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
  67           first=`echo $$buildid | cut -b-2`; \
  68           last=`echo $$buildid | cut -b3-`; \
  69           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
  70           ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
  71         fi
  72 endef
  73
  74 $(MODLIB)/vdso: FORCE
  75         @mkdir -p $(MODLIB)/vdso
  76
  77 PHONY += vdso_install
  78 vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
  79         $(call cmd,vdso_install)