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path: root/arch/mips/include/asm/vdso/gettimeofday.h
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2021-04-23mips: Do not include hi and lo in clobber list for R6Romain Naour1-5/+21
From [1] "GCC 10 (PR 91233) won't silently allow registers that are not architecturally available to be present in the clobber list anymore, resulting in build failure for mips*r6 targets in form of: ... .../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target 146 | __asm__ volatile ( \ | ^~~~~~~ This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension. This patch provides the alternative clobber list for r6 targets that won't include those registers." Since kernel 5.4 and mips support for generic vDSO [2], the kernel fail to build for mips r6 cpus with gcc 10 for the same reason as glibc. [1] https://sourceware.org/git/?p=glibc.git;a=commit;h=020b2a97bb15f807c0482f0faee2184ed05bcad8 [2] '24640f233b46 ("mips: Add support for generic vDSO")' Signed-off-by: Romain Naour <romain.naour@gmail.com> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
2020-08-06vdso/treewide: Add vdso_data pointer argument to __arch_get_hw_counter()Thomas Gleixner1-2/+3
MIPS already uses and S390 will need the vdso data pointer in __arch_get_hw_counter(). This works nicely as long as the architecture does not support time namespaces in the VDSO. With time namespaces enabled the regular accessor to the vdso data pointer __arch_get_vdso_data() will return the namespace specific VDSO data page for tasks which are part of a non-root time namespace. This would cause the architectures which need the vdso data pointer in __arch_get_hw_counter() to access the wrong vdso data page. Add a vdso_data pointer argument to __arch_get_hw_counter() and hand it in from the call sites in the core code. For architectures which do not need the data pointer in their counter accessor function the compiler will just optimize it out. Fix up all existing architecture implementations and make MIPS utilize the pointer instead of invoking the accessor function. No functional change and no change in the resulting object code (except MIPS). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/draft-87wo2ekuzn.fsf@nanos.tec.linutronix.de
2020-03-21mips: vdso: Enable mips to use common headersVincenzo Frascino1-4/+0
Enable mips to use only the common headers in the implementation of the vDSO library. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Paul Burton <paulburton@kernel.org> Link: https://lkml.kernel.org/r/20200320145351.32292-23-vincenzo.frascino@arm.com
2020-02-17mips: vdso: Use generic VDSO clock mode storageThomas Gleixner1-20/+10
Switch to the generic VDSO clock mode storage. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Link: https://lkml.kernel.org/r/20200207124403.244684017@linutronix.de
2020-02-17MIPS: vdso: Compile high resolution parts conditionallyThomas Gleixner1-0/+7
If neither the R4K nor the GIC timer is enabled in the kernel configuration then let the core VDSO code drop the high resolution parts at compile time. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Link: https://lkml.kernel.org/r/20200207124402.714585315@linutronix.de
2020-01-14mips: vdso: Remove unused VDSO_HAS_32BIT_FALLBACKVincenzo Frascino1-2/+0
VDSO_HAS_32BIT_FALLBACK has been removed from the core since the architectures that support the generic vDSO library have been converted to support the 32 bit fallbacks. Remove unused VDSO_HAS_32BIT_FALLBACK from mips vdso. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Paul Burton <paul.burton@mips.com> Link: https://lore.kernel.org/r/20190830135902.20861-8-vincenzo.frascino@arm.com
2019-12-02mips: Fix gettimeofday() in the vdso libraryVincenzo Frascino1-13/+0
The libc provides a discovery mechanism for vDSO library and its symbols. When a symbol is not exposed by the vDSOs the libc falls back on the system calls. With the introduction of the unified vDSO library on mips this behavior is not honored anymore by the kernel in the case of gettimeofday(). The issue has been noticed and reported due to a dhclient failure on the CI20 board: root@letux:~# dhclient ../../../../lib/isc/unix/time.c:200: Operation not permitted root@letux:~# Restore the original behavior fixing gettimeofday() in the vDSO library. Reported-by: H. Nikolaus Schaller <hns@goldelico.com> Tested-by: H. Nikolaus Schaller <hns@goldelico.com> # CI20 with JZ4780 Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: mips-creator-ci20-dev@googlegroups.com Cc: letux-kernel@openphoenux.org Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
2019-10-18mips: vdso: Fix __arch_get_hw_counter()Vincenzo Frascino1-1/+3
On some MIPS variants (e.g. MIPS r1), vDSO clock_mode is set to VDSO_CLOCK_NONE. When VDSO_CLOCK_NONE is set the expected kernel behavior is to fallback on syscalls. To do that the generic vDSO library expects UULONG_MAX as return value of __arch_get_hw_counter(). Fix __arch_get_hw_counter() on MIPS defining a __VDSO_USE_SYSCALL case that addressed the described scenario. Reported-by: Maxime Bizon <mbizon@freebox.fr> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Tested-by: Maxime Bizon <mbizon@freebox.fr> Signed-off-by: Paul Burton <paulburton@kernel.org> Cc: linux-mips@vger.kernel.org
2019-09-03mips: compat: vdso: Use legacy syscalls as fallbackVincenzo Frascino1-0/+45
The generic VDSO implementation uses the Y2038 safe clock_gettime64() and clock_getres_time64() syscalls as fallback for 32bit VDSO. This breaks seccomp setups because these syscalls might be not (yet) allowed. Implement the 32bit variants which use the legacy syscalls and select the variant in the core library. The 64bit time variants are not removed because they are required for the time64 based vdso accessors. Cc: Paul Burton <paul.burton@mips.com> Fixes: 00b26474c2f1 ("lib/vdso: Provide generic VDSO implementation") Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Cc: catalin.marinas@arm.com Cc: will@kernel.org Cc: tglx@linutronix.de Cc: salyzyn@android.com Cc: 0x7f454c46@gmail.com Cc: luto@kernel.org
2019-07-25mips: Add clock_getres entry pointVincenzo Frascino1-0/+26
The generic vDSO library provides an implementation of clock_getres() that can be leveraged by each architecture. Add clock_getres() entry point on mips. Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Paul Burton <paul.burton@mips.com>
2019-07-25mips: Add support for generic vDSOVincenzo Frascino1-0/+151
The mips vDSO library requires some adaptations to take advantage of the newly introduced generic vDSO library. Introduce the following changes: - Modification of vdso.c to be compliant with the common vdso datapage - Use of lib/vdso for gettimeofday Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> [paul.burton@mips.com: Prepend $(src) to config-n32-o32-env.c path.] Signed-off-by: Paul Burton <paul.burton@mips.com>

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