On powerpc, __arch_get_vdso_data() clobbers the link register, requiring the caller to save it.
As the parent function already has to set a stack frame and saves the link register before calling the C vdso function, retriving the vdso data pointer there is lighter. Give architectures the opportunity to hand the vdso data pointer to C vdso functions. Signed-off-by: Christophe Leroy <[email protected]> --- lib/vdso/gettimeofday.c | 83 +++++++++++++++++++++++++++++++++-------- 1 file changed, 67 insertions(+), 16 deletions(-) diff --git a/lib/vdso/gettimeofday.c b/lib/vdso/gettimeofday.c index f8b8ec5e63ac..72d65dd50cb4 100644 --- a/lib/vdso/gettimeofday.c +++ b/lib/vdso/gettimeofday.c @@ -206,9 +206,9 @@ static __always_inline int do_coarse(const struct vdso_data *vd, clockid_t clk, } static __maybe_unused int -__cvdso_clock_gettime_common(clockid_t clock, struct __kernel_timespec *ts) +__cvdso_clock_gettime_common(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *ts) { - const struct vdso_data *vd = __arch_get_vdso_data(); u32 msk; /* Check for negative values or invalid clocks */ @@ -233,23 +233,33 @@ __cvdso_clock_gettime_common(clockid_t clock, struct __kernel_timespec *ts) } static __maybe_unused int -__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) +__cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *ts) { - int ret = __cvdso_clock_gettime_common(clock, ts); + int ret = __cvdso_clock_gettime_common(vd, clock, ts); if (unlikely(ret)) return clock_gettime_fallback(clock, ts); return 0; } +static __maybe_unused int +__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_clock_gettime_data(vd, clock, ts); +} + #ifdef BUILD_VDSO32 static __maybe_unused int -__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res) +__cvdso_clock_gettime32_data(const struct vdso_data *vd, clockid_t clock, + struct old_timespec32 *res) { struct __kernel_timespec ts; int ret; - ret = __cvdso_clock_gettime_common(clock, &ts); + ret = __cvdso_clock_gettime_common(vd, clock, &ts); if (unlikely(ret)) return clock_gettime32_fallback(clock, res); @@ -260,13 +270,21 @@ __cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res) return ret; } -#endif /* BUILD_VDSO32 */ static __maybe_unused int -__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) +__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res) { const struct vdso_data *vd = __arch_get_vdso_data(); + return __cvdso_clock_gettime32_data(vd, clock, res); +} +#endif /* BUILD_VDSO32 */ + +static __maybe_unused int +__cvdso_gettimeofday_data(const struct vdso_data *vd, + struct __kernel_old_timeval *tv, struct timezone *tz) +{ + if (likely(tv != NULL)) { struct __kernel_timespec ts; @@ -289,10 +307,18 @@ __cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) return 0; } -#ifdef VDSO_HAS_TIME -static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time) +static __maybe_unused int +__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz) { const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_gettimeofday_data(vd, tv, tz); +} + +#ifdef VDSO_HAS_TIME +static __maybe_unused __kernel_old_time_t +__cvdso_time_data(const struct vdso_data *vd, __kernel_old_time_t *time) +{ __kernel_old_time_t t; if (IS_ENABLED(CONFIG_TIME_NS) && vd->clock_mode == VCLOCK_TIMENS) @@ -305,13 +331,20 @@ static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time return t; } + +static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_time_data(vd, time); +} #endif /* VDSO_HAS_TIME */ #ifdef VDSO_HAS_CLOCK_GETRES static __maybe_unused -int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) +int __cvdso_clock_getres_common(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *res) { - const struct vdso_data *vd = __arch_get_vdso_data(); u32 msk; u64 ns; @@ -349,23 +382,33 @@ int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res) } static __maybe_unused -int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res) +int __cvdso_clock_getres_data(const struct vdso_data *vd, clockid_t clock, + struct __kernel_timespec *res) { - int ret = __cvdso_clock_getres_common(clock, res); + int ret = __cvdso_clock_getres_common(vd, clock, res); if (unlikely(ret)) return clock_getres_fallback(clock, res); return 0; } +static __maybe_unused +int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_clock_getres_data(vd, clock, res); +} + #ifdef BUILD_VDSO32 static __maybe_unused int -__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res) +__cvdso_clock_getres_time32_data(const struct vdso_data *vd, clockid_t clock, + struct old_timespec32 *res) { struct __kernel_timespec ts; int ret; - ret = __cvdso_clock_getres_common(clock, &ts); + ret = __cvdso_clock_getres_common(vd, clock, &ts); if (unlikely(ret)) return clock_getres32_fallback(clock, res); @@ -376,5 +419,13 @@ __cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res) } return ret; } + +static __maybe_unused int +__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res) +{ + const struct vdso_data *vd = __arch_get_vdso_data(); + + return __cvdso_clock_getres_time32_data(vd, clock, res); +} #endif /* BUILD_VDSO32 */ #endif /* VDSO_HAS_CLOCK_GETRES */ -- 2.25.0
