2023-08-30 17:31:07 +02:00
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# SPDX-License-Identifier: GPL-2.0
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# List of files in the vdso
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KCOV_INSTRUMENT := n
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2023-10-24 12:59:35 +02:00
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# Include the generic Makefile to check the built vdso.
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2023-08-30 17:31:07 +02:00
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include $(srctree)/lib/vdso/Makefile
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obj-vdso32 = vdso_user_wrapper-32.o note-32.o
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# Build rules
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targets := $(obj-vdso32) vdso32.so vdso32.so.dbg
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obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
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KBUILD_AFLAGS += -DBUILD_VDSO
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KBUILD_CFLAGS += -DBUILD_VDSO -DDISABLE_BRANCH_PROFILING
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KBUILD_AFLAGS_32 := $(filter-out -m64,$(KBUILD_AFLAGS))
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KBUILD_AFLAGS_32 += -m31 -s
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KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
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2023-10-24 12:59:35 +02:00
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KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32))
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2023-08-30 17:31:07 +02:00
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KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin
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LDFLAGS_vdso32.so.dbg += -fPIC -shared -soname=linux-vdso32.so.1 \
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--hash-style=both --build-id=sha1 -melf_s390 -T
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$(targets:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
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$(targets:%=$(obj)/%.dbg): KBUILD_AFLAGS = $(KBUILD_AFLAGS_32)
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obj-y += vdso32_wrapper.o
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targets += vdso32.lds
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CPPFLAGS_vdso32.lds += -P -C -U$(ARCH)
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# Disable gcov profiling, ubsan and kasan for VDSO code
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GCOV_PROFILE := n
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UBSAN_SANITIZE := n
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KASAN_SANITIZE := n
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KCSAN_SANITIZE := n
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# Force dependency (incbin is bad)
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$(obj)/vdso32_wrapper.o : $(obj)/vdso32.so
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2023-10-24 12:59:35 +02:00
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quiet_cmd_vdso_and_check = VDSO $@
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cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)
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2023-08-30 17:31:07 +02:00
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$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) FORCE
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2023-10-24 12:59:35 +02:00
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$(call if_changed,vdso_and_check)
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2023-08-30 17:31:07 +02:00
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# strip rule for the .so file
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$(obj)/%.so: OBJCOPYFLAGS := -S
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$(obj)/%.so: $(obj)/%.so.dbg FORCE
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$(call if_changed,objcopy)
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$(obj-vdso32): %-32.o: %.S FORCE
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$(call if_changed_dep,vdso32as)
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# actual build commands
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quiet_cmd_vdso32as = VDSO32A $@
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cmd_vdso32as = $(CC) $(a_flags) -c -o $@ $<
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quiet_cmd_vdso32cc = VDSO32C $@
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cmd_vdso32cc = $(CC) $(c_flags) -c -o $@ $<
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# install commands for the unstripped file
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quiet_cmd_vdso_install = INSTALL $@
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
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vdso32.so: $(obj)/vdso32.so.dbg
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@mkdir -p $(MODLIB)/vdso
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$(call cmd,vdso_install)
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vdso_install: vdso32.so
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# Generate VDSO offsets using helper script
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gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
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quiet_cmd_vdsosym = VDSOSYM $@
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
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$(call if_changed,vdsosym)
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