From 3a36a3100af2ee1cca69345af83228757e8c55fe Mon Sep 17 00:00:00 2001
From: Dmitry Chestnykh <dm.chestnykh@gmail.com>
Date: Mon, 15 Apr 2024 15:31:58 +0300
Subject: Fix vDSO support for all supported architectures.

- Cleanup dl-vdso.c code.
- Pass `void *` as first arg to `load_vdso()`, using 32-bit type
  is completely wrong on 64bit architectures.
- Split libc code and vDSO-related code.
  Move arch-specific implementations into separate files.

The performance improvement is for example 50-60 times on ARMv7
and about 4 times on x86_64.

Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>
---
 libc/sysdeps/linux/common/clock_gettime.c | 22 +++++++++++++++++---
 libc/sysdeps/linux/common/gettimeofday.c  | 34 ++++++++++---------------------
 2 files changed, 30 insertions(+), 26 deletions(-)

(limited to 'libc/sysdeps')

diff --git a/libc/sysdeps/linux/common/clock_gettime.c b/libc/sysdeps/linux/common/clock_gettime.c
index 4d787b9b7..b924d860b 100644
--- a/libc/sysdeps/linux/common/clock_gettime.c
+++ b/libc/sysdeps/linux/common/clock_gettime.c
@@ -11,10 +11,14 @@
 #include <sys/syscall.h>
 #include <time.h>
 
+#ifdef __VDSO_SUPPORT__
+#include "ldso.h"
+#endif
+
 #if defined(__UCLIBC_USE_TIME64__) && defined(__NR_clock_gettime64)
 #include "internal/time64_helpers.h"
 
-int clock_gettime(clockid_t clock_id, struct timespec *tp)
+int __libc_clock_gettime(clockid_t clock_id, struct timespec *tp)
 {
 	struct __ts64_struct __ts64;
 	int __ret = INLINE_SYSCALL(clock_gettime64, 2, clock_id, &__ts64);
@@ -26,11 +30,14 @@ int clock_gettime(clockid_t clock_id, struct timespec *tp)
 	return __ret;
 }
 #elif defined(__NR_clock_gettime)
-_syscall2(int, clock_gettime, clockid_t, clock_id, struct timespec*, tp)
+int __libc_clock_gettime(clockid_t clock_id, struct timespec *tp)
+{
+	return INLINE_SYSCALL(clock_gettime, 2, clock_id, tp);
+}
 #else
 # include <sys/time.h>
 
-int clock_gettime(clockid_t clock_id, struct timespec* tp)
+int __libc_clock_gettime(clockid_t clock_id, struct timespec* tp)
 {
 	struct timeval tv;
 	int retval = -1;
@@ -53,3 +60,12 @@ int clock_gettime(clockid_t clock_id, struct timespec* tp)
 	return retval;
 }
 #endif
+
+int clock_gettime(clockid_t clock_id, struct timespec *tp)
+{
+#if defined(__VDSO_SUPPORT__) && defined(ARCH_VDSO_CLOCK_GETTIME)
+	return ARCH_VDSO_CLOCK_GETTIME(clock_id, tp);
+#else
+	return __libc_clock_gettime(clock_id, tp);
+#endif
+}
diff --git a/libc/sysdeps/linux/common/gettimeofday.c b/libc/sysdeps/linux/common/gettimeofday.c
index ed18b2be5..9b29fe5a0 100755
--- a/libc/sysdeps/linux/common/gettimeofday.c
+++ b/libc/sysdeps/linux/common/gettimeofday.c
@@ -14,30 +14,18 @@
 #include "ldso.h"
 #endif
 
-#ifdef __VDSO_SUPPORT__
-typedef int (*gettimeofday_func)(struct timeval * tv, __timezone_ptr_t tz);
-#endif
-
 int gettimeofday(struct timeval * tv, __timezone_ptr_t tz) {
-
-    #ifdef __VDSO_SUPPORT__
-        if ( _dl__vdso_gettimeofday != 0 ){
-            gettimeofday_func func= _dl__vdso_gettimeofday;
-            return func( tv, tz );
-
-        }else{
-            _syscall2_body(int, gettimeofday, struct timeval *, tv, __timezone_ptr_t, tz)
-        }
-    #else
-        if (!tv)
-            return 0;
-
-        struct timespec __ts;
-        int __ret = clock_gettime(CLOCK_REALTIME, &__ts);
-        tv->tv_sec = __ts.tv_sec;
-        tv->tv_usec = (suseconds_t)__ts.tv_nsec / 1000;
-        return __ret;
-    #endif
+    if (!tv)
+        return 0;
+#if defined(__VDSO_SUPPORT__) && defined(ARCH_VDSO_GETTIMEOFDAY)
+    return ARCH_VDSO_GETTIMEOFDAY(tv, tz);
+#else
+    struct timespec __ts;
+    int __ret = clock_gettime(CLOCK_REALTIME, &__ts);
+    tv->tv_sec = __ts.tv_sec;
+    tv->tv_usec = (suseconds_t)__ts.tv_nsec / 1000;
+    return __ret;
+#endif
 }
 
 
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