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b1992c3772
Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:
src := $(obj)
When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.
This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.
To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.
Going forward, the variables used in Makefiles will have the following
meanings:
$(obj) - directory in the object tree
$(src) - directory in the source tree (changed by this commit)
$(objtree) - the top of the kernel object tree
$(srctree) - the top of the kernel source tree
Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
71 lines
2.1 KiB
Makefile
71 lines
2.1 KiB
Makefile
# 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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# Include the generic Makefile to check the built vdso.
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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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KBUILD_CFLAGS_32 := $(filter-out -mno-pic-data-is-text-relative,$(KBUILD_CFLAGS_32))
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KBUILD_CFLAGS_32 += -m31 -fPIC -shared -fno-common -fno-builtin
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LDFLAGS_vdso32.so.dbg += -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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quiet_cmd_vdso_and_check = VDSO $@
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cmd_vdso_and_check = $(cmd_ld); $(cmd_vdso_check)
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$(obj)/vdso32.so.dbg: $(obj)/vdso32.lds $(obj-vdso32) FORCE
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$(call if_changed,vdso_and_check)
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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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# Generate VDSO offsets using helper script
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gen-vdsosym := $(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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