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# SPDX-License-Identifier: GPL-2.0
# Include the generic Makefile to check the built vdso.
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
UBSAN_SANITIZE := 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 $< $@