linux-kernel - [PATCH v3 34/36] sparc64: vdso: Implement clock

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Message-Id: <20250917-vdso-sparc64-generic-2-v3-34-3679b1bc8ee8@linutronix.de>
Date: Wed, 17 Sep 2025 16:00:36 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Arnd Bergmann <arnd@...db.de>, "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>, Nick Alcock <nick.alcock@...cle.com>, 
 John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>, 
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>, 
 Shuah Khan <shuah@...nel.org>, Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Theodore Ts'o <tytso@....edu>, 
 "Jason A. Donenfeld" <Jason@...c4.com>, 
 Russell King <linux@...linux.org.uk>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>, 
 Nagarathnam Muthusamy <nagarathnam.muthusamy@...cle.com>, 
 Shannon Nelson <sln@...main.com>
Cc: linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev, 
 linux-mips@...r.kernel.org, linux-s390@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v3 34/36] sparc64: vdso: Implement clock_gettime64()

To be y2038-safe, 32-bit userspace needs to explicitly call the 64-bit safe
time APIs.

Implement clock_gettime64() in the 32-bit vDSO.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 arch/sparc/include/asm/vdso/gettimeofday.h | 20 ++++++++++++++++++--
 arch/sparc/vdso/vclock_gettime.c           |  8 ++++++++
 arch/sparc/vdso/vdso32/vdso32.lds.S        |  2 ++
 3 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/vdso/gettimeofday.h b/arch/sparc/include/asm/vdso/gettimeofday.h
index a35875fba45470ba961a7df3ae52bc17d2a4a4a0..b0c80c8a28bb71e16398ab38904ba826457ac71d 100644
--- a/arch/sparc/include/asm/vdso/gettimeofday.h
+++ b/arch/sparc/include/asm/vdso/gettimeofday.h
@@ -101,6 +101,8 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode, const struct vd
 	"f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62",		\
 	"cc", "memory"

+#ifdef CONFIG_SPARC64
+
 static __always_inline
 long clock_gettime_fallback(clockid_t clock, struct __kernel_timespec *ts)
 {
@@ -113,7 +115,20 @@ long clock_gettime_fallback(clockid_t clock, struct __kernel_timespec *ts)
 	return o0;
 }

-#ifndef CONFIG_SPARC64
+#else /* !CONFIG_SPARC64 */
+
+static __always_inline
+long clock_gettime_fallback(clockid_t clock, struct __kernel_timespec *ts)
+{
+	register long num __asm__("g1") = __NR_clock_gettime64;
+	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 clock_gettime32_fallback(clockid_t clock, struct old_timespec32 *ts)
 {
@@ -125,7 +140,8 @@ long clock_gettime32_fallback(clockid_t clock, struct old_timespec32 *ts)
 			     "0" (o0), "r" (o1) : SYSCALL_CLOBBERS);
 	return o0;
 }
-#endif
+
+#endif /* CONFIG_SPARC64 */

 static __always_inline
 long gettimeofday_fallback(struct __kernel_old_timeval *tv, struct timezone *tz)
diff --git a/arch/sparc/vdso/vclock_gettime.c b/arch/sparc/vdso/vclock_gettime.c
index 093a7ff4dafce1cf0af5af4c303bef86e159858a..1d9859392e4cfd285349cf9155ca1fc25d3a7b41 100644
--- a/arch/sparc/vdso/vclock_gettime.c
+++ b/arch/sparc/vdso/vclock_gettime.c
@@ -48,4 +48,12 @@ int __vdso_clock_gettime(clockid_t clock, struct old_timespec32 *ts)
 int clock_gettime(clockid_t, struct old_timespec32 *)
 	__weak __alias(__vdso_clock_gettime);

+int __vdso_clock_gettime64(clockid_t clock, struct __kernel_timespec *ts)
+{
+	return __cvdso_clock_gettime(clock, ts);
+}
+
+int clock_gettime64(clockid_t, struct __kernel_timespec *)
+	__weak __alias(__vdso_clock_gettime64);
+
 #endif
diff --git a/arch/sparc/vdso/vdso32/vdso32.lds.S b/arch/sparc/vdso/vdso32/vdso32.lds.S
index 53575ee154c492f9503efdd8f995ac2a035203c7..a14e4f77e6f2222b855df27cc7a0d0a4f98bd4ac 100644
--- a/arch/sparc/vdso/vdso32/vdso32.lds.S
+++ b/arch/sparc/vdso/vdso32/vdso32.lds.S
@@ -17,6 +17,8 @@ VERSION {
 	global:
 		clock_gettime;
 		__vdso_clock_gettime;
+		clock_gettime64;
+		__vdso_clock_gettime64;
 		gettimeofday;
 		__vdso_gettimeofday;
 	local: *;

-- 
2.51.0