OSCL-LXR

0001 # SPDX-License-Identifier: GPL-2.0
0002
0003 # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
0004 # the inclusion of generic Makefile.
0005 ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32
0006 include $(srctree)/lib/vdso/Makefile
0007
0008 hostprogs := vdsomunge
0009
0010 obj-vdso := vgettimeofday.o datapage.o note.o
0011
0012 # Build rules
0013 targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.so.raw vdso.lds
0014 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
0015
0016 ccflags-y := -fPIC -fno-common -fno-builtin -fno-stack-protector
0017 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO32
0018
0019 ldflags-$(CONFIG_CPU_ENDIAN_BE8) := --be8
0020 ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
0021             -z max-page-size=4096 -shared $(ldflags-y) \
0022             --hash-style=sysv --build-id=sha1 \
0023             -T
0024
0025 obj-$(CONFIG_VDSO) += vdso.o
0026 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
0027
0028 CFLAGS_REMOVE_vdso.o = -pg
0029
0030 # Force -O2 to avoid libgcc dependencies
0031 CFLAGS_REMOVE_vgettimeofday.o = -pg -Os $(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS)
0032 ifeq ($(c-gettimeofday-y),)
0033 CFLAGS_vgettimeofday.o = -O2
0034 else
0035 CFLAGS_vgettimeofday.o = -O2 -include $(c-gettimeofday-y)
0036 endif
0037
0038 # Disable gcov profiling for VDSO code
0039 GCOV_PROFILE := n
0040
0041 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
0042 KCOV_INSTRUMENT := n
0043
0044 KASAN_SANITIZE := n
0045
0046 # Force dependency
0047 $(obj)/vdso.o : $(obj)/vdso.so
0048
0049 # Link rule for the .so file
0050 $(obj)/vdso.so.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
0051         $(call if_changed,vdsold_and_vdso_check)
0052
0053 $(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/vdsomunge FORCE
0054         $(call if_changed,vdsomunge)
0055
0056 # Strip rule for the .so file
0057 $(obj)/%.so: OBJCOPYFLAGS := -S
0058 $(obj)/%.so: $(obj)/%.so.dbg FORCE
0059         $(call if_changed,objcopy)
0060
0061 # Actual build commands
0062 quiet_cmd_vdsold_and_vdso_check = LD      $@
0063       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
0064
0065 quiet_cmd_vdsomunge = MUNGE   $@
0066       cmd_vdsomunge = $(objtree)/$(obj)/vdsomunge $< $@
0067
0068 #
0069 # Install the unstripped copy of vdso.so.dbg.  If our toolchain
0070 # supports build-id, install .build-id links as well.
0071 #
0072 # Cribbed from arch/x86/vdso/Makefile.
0073 #
0074 quiet_cmd_vdso_install = INSTALL $<
0075 define cmd_vdso_install
0076         cp $< "$(MODLIB)/vdso/vdso.so"; \
0077         if readelf -n $< | grep -q 'Build ID'; then \
0078           buildid=`readelf -n $< |grep 'Build ID' |sed -e 's/^.*Build ID: \(.*\)$$/\1/'`; \
0079           first=`echo $$buildid | cut -b-2`; \
0080           last=`echo $$buildid | cut -b3-`; \
0081           mkdir -p "$(MODLIB)/vdso/.build-id/$$first"; \
0082           ln -sf "../../vdso.so" "$(MODLIB)/vdso/.build-id/$$first/$$last.debug"; \
0083         fi
0084 endef
0085
0086 $(MODLIB)/vdso: FORCE
0087         @mkdir -p $(MODLIB)/vdso
0088
0089 PHONY += vdso_install
0090 vdso_install: $(obj)/vdso.so.dbg $(MODLIB)/vdso
0091         $(call cmd,vdso_install)