diff options
| author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2019-06-21 10:52:29 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-06-22 21:21:05 +0200 |
| commit | 00b26474c2f1613d7ab894c525f775c67c8a9e8f (patch) | |
| tree | ec821728fc16277806e520618650cbbdb5159575 /lib/vdso/Makefile | |
| parent | 361f8aee9b093526297d567a9dc2f6cbf746e5f9 (diff) | |
lib/vdso: Provide generic VDSO implementation
In the last few years the kernel gained quite some architecture specific
vdso implementations which contain very similar code.
Introduce a generic VDSO implementation of gettimeofday() which will be
shareable between architectures once they are converted over.
The implementation is based on the current x86 VDSO code.
[ tglx: Massaged changelog and made the kernel doc tabular ]
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/20190621095252.32307-3-vincenzo.frascino@arm.com
Diffstat (limited to 'lib/vdso/Makefile')
| -rw-r--r-- | lib/vdso/Makefile | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/vdso/Makefile b/lib/vdso/Makefile new file mode 100644 index 000000000000..c415a685d61b --- /dev/null +++ b/lib/vdso/Makefile @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0 + +GENERIC_VDSO_MK_PATH := $(abspath $(lastword $(MAKEFILE_LIST))) +GENERIC_VDSO_DIR := $(dir $(GENERIC_VDSO_MK_PATH)) + +c-gettimeofday-$(CONFIG_GENERIC_GETTIMEOFDAY) := $(addprefix $(GENERIC_VDSO_DIR), gettimeofday.c) + +# This cmd checks that the vdso library does not contain absolute relocation +# It has to be called after the linking of the vdso library and requires it +# as a parameter. +# +# $(ARCH_REL_TYPE_ABS) is defined in the arch specific makefile and corresponds +# to the absolute relocation types printed by "objdump -R" and accepted by the +# dynamic linker. +ifndef ARCH_REL_TYPE_ABS +$(error ARCH_REL_TYPE_ABS is not set) +endif + +quiet_cmd_vdso_check = VDSOCHK $@ + cmd_vdso_check = if $(OBJDUMP) -R $@ | egrep -h "$(ARCH_REL_TYPE_ABS)"; \ + then (echo >&2 "$@: dynamic relocations are not supported"; \ + rm -f $@; /bin/false); fi |