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- # SPDX-License-Identifier: GPL-2.0-only
- # Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
- # the inclusion of generic Makefile.
- ARCH_REL_TYPE_ABS := R_CKCORE_ADDR32|R_CKCORE_JUMP_SLOT
- include $(srctree)/lib/vdso/Makefile
- # Symbols present in the vdso
- vdso-syms += rt_sigreturn
- vdso-syms += vgettimeofday
- # Files to link into the vdso
- obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o
- ifneq ($(c-gettimeofday-y),)
- CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
- endif
- ccflags-y := -fno-stack-protector -DBUILD_VDSO32
- # Build rules
- targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o
- obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
- obj-y += vdso.o vdso-syms.o
- CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
- # Disable gcov profiling for VDSO code
- GCOV_PROFILE := n
- KCOV_INSTRUMENT := n
- # Force dependency
- $(obj)/vdso.o: $(obj)/vdso.so
- SYSCFLAGS_vdso.so.dbg = $(c_flags)
- $(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso) FORCE
- $(call if_changed,vdsold)
- SYSCFLAGS_vdso.so.dbg = -shared -s -Wl,-soname=linux-vdso.so.1 \
- -Wl,--build-id=sha1 -Wl,--hash-style=both
- $(obj)/vdso-syms.S: $(obj)/vdso.so FORCE
- $(call if_changed,so2s)
- # strip rule for the .so file
- $(obj)/%.so: OBJCOPYFLAGS := -S
- $(obj)/%.so: $(obj)/%.so.dbg FORCE
- $(call if_changed,objcopy)
- # actual build commands
- # The DSO images are built using a special linker script
- # Make sure only to export the intended __vdso_xxx symbol offsets.
- quiet_cmd_vdsold = VDSOLD $@
- cmd_vdsold = $(CC) $(KBUILD_CFLAGS) $(call cc-option, -no-pie) -nostdlib -nostartfiles $(SYSCFLAGS_$(@F)) \
- -Wl,-T,$(filter-out FORCE,$^) -o [email protected] && \
- $(CROSS_COMPILE)objcopy \
- $(patsubst %, -G __vdso_%, $(vdso-syms)) [email protected] $@ && \
- rm [email protected]
- # Extracts symbol offsets from the VDSO, converting them into an assembly file
- # that contains the same symbols at the same offsets.
- quiet_cmd_so2s = SO2S $@
- cmd_so2s = $(NM) -D $< | $(srctree)/$(src)/so2s.sh > $@
- # install commands for the unstripped file
- quiet_cmd_vdso_install = INSTALL $@
- cmd_vdso_install = cp $(obj)/[email protected] $(MODLIB)/vdso/$@
- vdso.so: $(obj)/vdso.so.dbg
- @mkdir -p $(MODLIB)/vdso
- $(call cmd,vdso_install)
- vdso_install: vdso.so
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