mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-08 17:49:45 +00:00
28b1a824a4
To take advantage of the commonly defined vdso interface for gettimeofday() the architectural code requires an adaptation. Re-implement the gettimeofday VDSO in C in order to use lib/vdso. With the new implementation arm64 gains support for CLOCK_BOOTTIME and CLOCK_TAI. [ tglx: Reformatted the function line breaks ] Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Shijith Thotton <sthotton@marvell.com> Tested-by: Andre Przywara <andre.przywara@arm.com> Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mips@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mark Salyzyn <salyzyn@android.com> Cc: Peter Collingbourne <pcc@google.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Huw Davies <huw@codeweavers.com> Link: https://lkml.kernel.org/r/20190621095252.32307-5-vincenzo.frascino@arm.com
81 lines
2.2 KiB
Makefile
81 lines
2.2 KiB
Makefile
# 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.
|
|
#
|
|
|
|
# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before
|
|
# the inclusion of generic Makefile.
|
|
ARCH_REL_TYPE_ABS := R_AARCH64_JUMP_SLOT|R_AARCH64_GLOB_DAT|R_AARCH64_ABS64
|
|
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))
|
|
|
|
ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
|
|
--build-id -n -T
|
|
|
|
ccflags-y := -fno-common -fno-builtin -fno-stack-protector
|
|
ccflags-y += -DDISABLE_BRANCH_PROFILING
|
|
|
|
VDSO_LDFLAGS := -Bsymbolic
|
|
|
|
CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os
|
|
KBUILD_CFLAGS += $(DISABLE_LTO)
|
|
KASAN_SANITIZE := n
|
|
UBSAN_SANITIZE := n
|
|
OBJECT_FILES_NON_STANDARD := y
|
|
KCOV_INSTRUMENT := n
|
|
|
|
ifeq ($(c-gettimeofday-y),)
|
|
CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny
|
|
else
|
|
CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -include $(c-gettimeofday-y)
|
|
endif
|
|
|
|
# Disable gcov profiling for VDSO code
|
|
GCOV_PROFILE := n
|
|
|
|
obj-y += vdso.o
|
|
extra-y += vdso.lds
|
|
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
|
|
|
|
# Force dependency (incbin is bad)
|
|
$(obj)/vdso.o : $(obj)/vdso.so
|
|
|
|
# Link rule for the .so file, .lds has to be first
|
|
$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
|
|
$(call if_changed,ld)
|
|
$(call if_changed,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 := $(srctree)/$(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_vdsocc = VDSOCC $@
|
|
cmd_vdsocc = $(CC) $(a_flags) $(c_flags) -c -o $@ $<
|
|
|
|
# Install commands for the unstripped file
|
|
quiet_cmd_vdso_install = INSTALL $@
|
|
cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
|
|
|
|
vdso.so: $(obj)/vdso.so.dbg
|
|
@mkdir -p $(MODLIB)/vdso
|
|
$(call cmd,vdso_install)
|
|
|
|
vdso_install: vdso.so
|