linux/arch/arm/vdso/Makefile
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   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.
   5ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
   6include $(srctree)/lib/vdso/Makefile
   7
   8hostprogs := vdsomunge
   9
  10obj-vdso := vgettimeofday.o datapage.o note.o
  11
  12# Build rules
  13targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
  14obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
  15
  16ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
  17ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
  18
  19ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
  20ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
  21            -z max-page-size=4096 -nostdlib -shared $(ldflags-y) \
  22            --hash-style=sysv --build-id=sha1 \
  23            -T
  24
  25obj-$(CONFIG_VDSO) += vdso.o
  26CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
  27
  28CFLAGS_REMOVE_vdso.o = -pg
  29
  30# Force -O2 to avoid libgcc dependencies
  31CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(GCC_PLUGINS_CFLAGS)
  32ifeq ($(c-gettimeofday-y),)
  33CFLAGS_vgettimeofday.o = -O2
  34else
  35CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
  36endif
  37
  38# Disable gcov profiling for VDSO code
  39GCOV_PROFILE := n
  40
  41# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
  42KCOV_INSTRUMENT := n
  43
  44KASAN_SANITIZE := n
  45
  46# Force dependency
  47$(obj)/vdso.o : $(obj)/vdso.so
  48
  49# Link rule for the .so file
  50$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
  51        $(call if_changed,vdsold_and_vdso_check)
  52
  53$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
  54        $(call if_changed,vdsomunge)
  55
  56# Strip rule for the .so file
  57$(obj)/%.so: OBJCOPYFLAGS := -S
  58$(obj)/%.so: $(obj)/%.so.dbg FORCE
  59        $(call if_changed,objcopy)
  60
  61# Actual build commands
  62quiet_cmd_vdsold_and_vdso_check = LD      $@
  63      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
  64
  65quiet_cmd_vdsomunge = MUNGE   $@
  66      cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
  67
  68#
  69# Install the unstripped copy of vdso.so.dbg.  If our toolchain
  70# supports build-id, install .build-id links as well.
  71#
  72# Cribbed from arch/x86/vdso/Makefile.
  73#
  74quiet_cmd_vdso_install = INSTALL $<
  75define cmd_vdso_install
  76        cp $< "$(MODLIB)/vdso/vdso.so"; \
  77        if readelf -n $< | grep -q 'Build ID'; then \
  78          buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
  79          first=`echo $$buildid | cut -b-2`; \
  80          last=`echo $$buildid | cut -b3-`; \
  81          mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
  82          ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
  83        fi
  84endef
  85
  86$(MODLIB)/vdso: FORCE
  87        @mkdir -p $(MODLIB)/vdso
  88
  89PHONY += vdso_install
  90vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
  91        $(call cmd,vdso_install)
  92