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Masahiro Yamada 7f7f6f7ad6 Makefile: remove redundant tool coverage variables

Now Kbuild provides reasonable defaults for objtool, sanitizers, and
profilers.

Remove redundant variables.

Note:

This commit changes the coverage for some objects:

  - include arch/mips/vdso/vdso-image.o into UBSAN, GCOV, KCOV
  - include arch/sparc/vdso/vdso-image-*.o into UBSAN
  - include arch/sparc/vdso/vma.o into UBSAN
  - include arch/x86/entry/vdso/extable.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso-image-*.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vdso32-setup.o into KASAN, KCSAN, UBSAN, GCOV, KCOV
  - include arch/x86/entry/vdso/vma.o into GCOV, KCOV
  - include arch/x86/um/vdso/vma.o into KASAN, GCOV, KCOV

I believe these are positive effects because all of them are kernel
space objects.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Roberto Sassu <roberto.sassu@huawei.com>

2024-05-14 23:35:48 +09:00

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SPDX-License-Identifier: GPL-2.0

Objects to go into the VDSO.

Include the generic Makefile to check the built vdso.

include $(srctree)/lib/vdso/Makefile

obj-vdso-y := elf.o vgetcpu.o vgettimeofday.o sigreturn.o

Common compiler flags between ABIs.

ccflags-vdso :=
$(filter -I%,$(KBUILD_CFLAGS))
$(filter -E%,$(KBUILD_CFLAGS))
$(filter -march=%,$(KBUILD_CFLAGS))
$(filter -m%-float,$(KBUILD_CFLAGS))
$(CLANG_FLAGS)
-D__VDSO__

cflags-vdso := $(ccflags-vdso)
-isystem $(shell $(CC) -print-file-name=include)
$(filter -W%,$(filter-out -Wa$(comma)%,$(KBUILD_CFLAGS)))
-O2 -g -fno-strict-aliasing -fno-common -fno-builtin
-fno-stack-protector -fno-jump-tables -DDISABLE_BRANCH_PROFILING
$(call cc-option, -fno-asynchronous-unwind-tables)
$(call cc-option, -fno-stack-protector) aflags-vdso := $(ccflags-vdso)
-D__ASSEMBLY__ -Wa,-gdwarf-2

ifneq ($(c-gettimeofday-y),) CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) endif

VDSO linker flags.

ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1
$(filter -E%,$(KBUILD_CFLAGS)) -nostdlib -shared
--hash-style=sysv --build-id -T

Shared build commands.

quiet_cmd_vdsold_and_vdso_check = LD $@ cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)

quiet_cmd_vdsoas_o_S = AS $@ cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<

Generate VDSO offsets using helper script

gen-vdsosym := $(src)/gen_vdso_offsets.sh quiet_cmd_vdsosym = VDSOSYM $@ cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@

include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE $(call if_changed,vdsosym)

Build native VDSO.

native-abi := $(filter -mabi=%,$(KBUILD_CFLAGS))

targets += $(obj-vdso-y) targets += vdso.lds vdso.so.dbg vdso.so

obj-vdso := $(obj-vdso-y:%.o=$(obj)/%.o)

$(obj-vdso): KBUILD_CFLAGS := $(cflags-vdso) $(native-abi) $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)

$(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)

$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE $(call if_changed,vdsold_and_vdso_check)

$(obj)/vdso.so: OBJCOPYFLAGS := -S $(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE $(call if_changed,objcopy)

obj-y += vdso.o

$(obj)/vdso.o : $(obj)/vdso.so

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