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