arch/arm/vdso/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
   4 # the inclusion of generic Makefile.
   5 ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
   6 include $(srctree)/lib/vdso/Makefile
   7
   8 hostprogs := vdsomunge
   9
  10 obj-vdso := vgettimeofday.o datapage.o note.o
  11
  12 # Build rules
  13 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
  14 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  15
  16 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
  17 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
  18
  19 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
  20 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  21             -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \
  22             --hash-style=sysv --build-id \
  23             -T
  24
  25 obj-$(CONFIG_VDSO) += vdso.o
  26 extra-$(CONFIG_VDSO) += vdso.lds
  27 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  28
  29 CFLAGS_REMOVE_vdso.o = -pg
  30
  31 # Force -O2 to avoid libgcc dependencies
  32 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os
  33 ifeq ($(c-gettimeofday-y),)
  34 CFLAGS_vgettimeofday.o = -O2
  35 else
  36 CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
  37 endif
  38
  39 # Disable gcov profiling for VDSO code
  40 GCOV_PROFILE := n
  41
  42 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  43 KCOV_INSTRUMENT := n
  44
  45 # Force dependency
  46 $(obj)/vdso.o : $(obj)/vdso.so
  47
  48 # Link rule for the .so file
  49 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  50         $(call if_changed,vdsold_and_vdso_check)
  51
  52 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
  53         $(call if_changed,vdsomunge)
  54
  55 # Strip rule for the .so file
  56 $(obj)/%.so: OBJCOPYFLAGS := -S
  57 $(obj)/%.so: $(obj)/%.so.dbg FORCE
  58         $(call if_changed,objcopy)
  59
  60 # Actual build commands
  61 quiet_cmd_vdsold_and_vdso_check = LD      $@
  62       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
  63
  64 quiet_cmd_vdsomunge = MUNGE   $@
  65       cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
  66
  67 #
  68 # Install the unstripped copy of vdso.so.dbg.  If our toolchain
  69 # supports build-id, install .build-id links as well.
  70 #
  71 # Cribbed from arch/x86/vdso/Makefile.
  72 #
  73 quiet_cmd_vdso_install = INSTALL $<
  74 define cmd_vdso_install
  75         cp $< "$(MODLIB)/vdso/vdso.so"; \
  76         if readelf -n $< | grep -q 'Build ID'; then \
  77           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
  78           first=`echo $$buildid | cut -b-2`; \
  79           last=`echo $$buildid | cut -b3-`; \
  80           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
  81           ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
  82         fi
  83 endef
  84
  85 $(MODLIB)/vdso: FORCE
  86         @mkdir -p $(MODLIB)/vdso
  87
  88 PHONY += vdso_install
  89 vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
  90         $(call cmd,vdso_install)