[PATCH v6 08/14] sparc64: vdso: Move syscall fallbacks into header

Thomas Weißschuh
2026-03-04T07:50:31Z

The generic vDSO libraries expected the syscall fallbacks in
asm/vdso/gettimeofday.h. To prepare the adoption of the generic library,
move the existing functions there.

While at it, rename them so they match what the generic library expects.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: Andreas Larsson <andreas@gaisler.com>
---
arch/sparc/include/asm/vdso/gettimeofday.h | 50 +++++++++++++++++++++++++++++
arch/sparc/vdso/vclock_gettime.c | 51 ++----------------------------
2 files changed, 52 insertions(+), 49 deletions(-)

diff --git a/arch/sparc/include/asm/vdso/gettimeofday.h b/arch/sparc/include/asm/vdso/gettimeofday.h
index 31f6505d3ab5..429dc080568f 100644
--- a/arch/sparc/include/asm/vdso/gettimeofday.h
+++ b/arch/sparc/include/asm/vdso/gettimeofday.h
@@ -6,6 +6,9 @@
#ifndef _ASM_SPARC_VDSO_GETTIMEOFDAY_H
#define _ASM_SPARC_VDSO_GETTIMEOFDAY_H

+#include <uapi/linux/time.h>
+#include <uapi/linux/unistd.h>
+
#include <linux/types.h>
#include <asm/vvar.h>

@@ -75,4 +78,51 @@ static __always_inline u64 __arch_get_hw_counter(struct vvar_data *vvar)
return vread_tick();
}

+#ifdef CONFIG_SPARC64
+#define SYSCALL_STRING \
+ "ta 0x6d;" \
+ "bcs,a 1f;" \
+ " sub %%g0, %%o0, %%o0;" \
+ "1:"
+#else
+#define SYSCALL_STRING \
+ "ta 0x10;" \
+ "bcs,a 1f;" \
+ " sub %%g0, %%o0, %%o0;" \
+ "1:"
+#endif
+
+#define SYSCALL_CLOBBERS \
+ "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
+ "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
+ "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
+ "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
+ "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", \
+ "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", \
+ "cc", "memory"
+
+static __always_inline
+long clock_gettime_fallback(clockid_t clock, struct __kernel_old_timespec *ts)
+{
+ register long num __asm__("g1") = __NR_clock_gettime;
+ register long o0 __asm__("o0") = clock;
+ register long o1 __asm__("o1") = (long) ts;
+
+ __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+ "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+ return o0;
+}
+
+static __always_inline
+long gettimeofday_fallback(struct __kernel_old_timeval *tv, struct timezone *tz)
+{
+ register long num __asm__("g1") = __NR_gettimeofday;
+ register long o0 __asm__("o0") = (long) tv;
+ register long o1 __asm__("o1") = (long) tz;
+
+ __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
+ "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
+ return o0;
+}
+
#endif /* _ASM_SPARC_VDSO_GETTIMEOFDAY_H */
diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
index 16ac80982a00..e768c0b84b34 100644
--- a/arch/sparc/vdso/vclock_gettime.c
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -13,38 +13,13 @@
*/

#include <linux/kernel.h>
-#include <linux/time.h>
#include <linux/string.h>
#include <asm/io.h>
-#include <asm/unistd.h>
#include <asm/timex.h>
#include <asm/clocksource.h>
#include <asm/vdso/gettimeofday.h>
#include <asm/vvar.h>

-#ifdef CONFIG_SPARC64
-#define SYSCALL_STRING \
- "ta 0x6d;" \
- "bcs,a 1f;" \
- " sub %%g0, %%o0, %%o0;" \
- "1:"
-#else
-#define SYSCALL_STRING \
- "ta 0x10;" \
- "bcs,a 1f;" \
- " sub %%g0, %%o0, %%o0;" \
- "1:"
-#endif
-
-#define SYSCALL_CLOBBERS \
- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \
- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", \
- "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", \
- "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", \
- "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", \
- "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", \
- "cc", "memory"
-
/*
* Compute the vvar page's address in the process address space, and return it
* as a pointer to the vvar_data.
@@ -64,28 +39,6 @@ notrace static __always_inline struct vvar_data *get_vvar_data(void)
return (struct vvar_data *) ret;
}

-notrace static long vdso_fallback_gettime(long clock, struct __kernel_old_timespec *ts)
-{
- register long num __asm__("g1") = __NR_clock_gettime;
- register long o0 __asm__("o0") = clock;
- register long o1 __asm__("o1") = (long) ts;
-
- __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
- "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
- return o0;
-}
-
-notrace static long vdso_fallback_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
-{
- register long num __asm__("g1") = __NR_gettimeofday;
- register long o0 __asm__("o0") = (long) tv;
- register long o1 __asm__("o1") = (long) tz;
-
- __asm__ __volatile__(SYSCALL_STRING : "=r" (o0) : "r" (num),
- "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
- return o0;
-}
-
notrace static __always_inline u64 vgetsns(struct vvar_data *vvar)
{
u64 v;
@@ -184,7 +137,7 @@ __vdso_clock_gettime(clockid_t clock, struct __kernel_old_timespec *ts)
/*
* Unknown clock ID ? Fall back to the syscall.
*/
- return vdso_fallback_gettime(clock, ts);
+ return clock_gettime_fallback(clock, ts);
}
int
clock_gettime(clockid_t, struct __kernel_old_timespec *)
@@ -220,7 +173,7 @@ __vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
}
return 0;
}
- return vdso_fallback_gettimeofday(tv, tz);
+ return gettimeofday_fallback(tv, tz);
}
int
gettimeofday(struct __kernel_old_timeval *, struct timezone *)

--
2.53.0