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Diffstat (limited to '')
-rw-r--r-- | arch/arm/vdso/Makefile | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile new file mode 100644 index 000000000..8ca1c9f26 --- /dev/null +++ b/arch/arm/vdso/Makefile @@ -0,0 +1,91 @@ +# SPDX-License-Identifier: GPL-2.0 + +# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before +# the inclusion of generic Makefile. +ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32 +include $(srctree)/lib/vdso/Makefile + +hostprogs := vdsomunge + +obj-vdso := vgettimeofday.o datapage.o note.o + +# Build rules +targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds +obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) + +ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector +ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32 + +ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8 +ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \ + -z max-page-size=4096 -shared $(ldflags-y) \ + --hash-style=sysv --build-id=sha1 \ + -T + +obj-$(CONFIG_VDSO) += vdso.o +CPPFLAGS_vdso.lds += -P -C -U$(ARCH) + +CFLAGS_REMOVE_vdso.o = -pg + +# Force -O2 to avoid libgcc dependencies +CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS) +ifeq ($(c-gettimeofday-y),) +CFLAGS_vgettimeofday.o = -O2 +else +CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y) +endif + +# Disable gcov profiling for VDSO code +GCOV_PROFILE := n + +# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. +KCOV_INSTRUMENT := n + +KASAN_SANITIZE := n + +# Force dependency +$(obj)/vdso.o : $(obj)/vdso.so + +# Link rule for the .so file +$(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE + $(call if_changed,vdsold_and_vdso_check) + +$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE + $(call if_changed,vdsomunge) + +# Strip rule for the .so file +$(obj)/%.so: OBJCOPYFLAGS := -S +$(obj)/%.so: $(obj)/%.so.dbg FORCE + $(call if_changed,objcopy) + +# Actual build commands +quiet_cmd_vdsold_and_vdso_check = LD $@ + cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) + +quiet_cmd_vdsomunge = MUNGE $@ + cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@ + +# +# Install the unstripped copy of vdso.so.dbg. If our toolchain +# supports build-id, install .build-id links as well. +# +# Cribbed from arch/x86/vdso/Makefile. +# +quiet_cmd_vdso_install = INSTALL $< +define cmd_vdso_install + cp $< "$(MODLIB)/vdso/vdso.so"; \ + if readelf -n $< | grep -q 'Build ID'; then \ + buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \ + first=`echo $$buildid | cut -b-2`; \ + last=`echo $$buildid | cut -b3-`; \ + mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \ + ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \ + fi +endef + +$(MODLIB)/vdso: FORCE + @mkdir -p $(MODLIB)/vdso + +PHONY += vdso_install +vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso + $(call cmd,vdso_install) |