7f7f6f7ad6
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>
2.3 KiB
SPDX-License-Identifier: GPL-2.0
Building a vDSO image for AArch64.
Author: Will Deacon will.deacon@arm.com
Heavily based on the vDSO Makefiles for other archs.
Include the generic Makefile to check the built vdso.
include $(srctree)/lib/vdso/Makefile
obj-vdso := vgettimeofday.o note.o sigreturn.o
Build rules
targets := $(obj-vdso) vdso.so vdso.so.dbg obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti
-Bsymbolic has been added for consistency with arm, the compat vDSO and
potential future proofing if we end up with internal calls to the exported
routines, as x86 does (see 6f121e548f ("x86, vdso: Reimplement vdso.so
preparation in build-time C")).
ldflags-y := -shared -soname=linux-vdso.so.1 --hash-style=sysv
-Bsymbolic --build-id=sha1 -n $(btildflags-y)
ifdef CONFIG_LD_ORPHAN_WARN ldflags-y += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) endif
ldflags-y += -T
ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
-Wmissing-prototypes and -Wmissing-declarations are removed from
the CFLAGS of vgettimeofday.c to make possible to build the
kernel with CONFIG_WERROR enabled.
CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS)
$(RANDSTRUCT_CFLAGS) $(GCC_PLUGINS_CFLAGS)
$(CC_FLAGS_LTO) $(CC_FLAGS_CFI)
-Wmissing-prototypes -Wmissing-declarations
CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables
ifneq ($(c-gettimeofday-y),) CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) endif
targets += vdso.lds CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
Link rule for the .so file, .lds has to be first
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE $(call if_changed,vdsold_and_vdso_check)
Strip rule for the .so file
$(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy)
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)
Actual build commands
quiet_cmd_vdsold_and_vdso_check = LD $@ cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)