linux: Add support for clock_gettime64 vDSO

No architecture currently defines the vDSO symbol.  On architectures
with 64-bit time_t the HAVE_CLOCK_GETTIME_VSYSCALL is renamed to
HAVE_CLOCK_GETTIME64_VSYSCALL, it simplifies clock_gettime code.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

sysdeps/unix/sysv/linux/aarch64/sysdep.h

@@ -161,7 +161,7 @@
 
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETRES_VSYSCALL	"__kernel_clock_getres"
-# define HAVE_CLOCK_GETTIME_VSYSCALL	"__kernel_clock_gettime"
+# define HAVE_CLOCK_GETTIME64_VSYSCALL	"__kernel_clock_gettime"
 # define HAVE_GETTIMEOFDAY_VSYSCALL	"__kernel_gettimeofday"
 
 /* Previously AArch64 used the generic version without the libc_hidden_def

sysdeps/unix/sysv/linux/clock_gettime.c

@@ -30,21 +30,24 @@ int
 __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp)
 {
 #ifdef __ASSUME_TIME64_SYSCALLS
-  /* 64 bit ABIs or Newer 32-bit ABIs that only support 64-bit time_t.  */
+  /* 64 bit ABIs or newer 32-bit ABIs that only support 64-bit time_t.  */
-# ifdef __NR_clock_gettime64
+# ifndef __NR_clock_gettime64
-  return INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp);
+#  define __NR_clock_gettime64 __NR_clock_gettime
+# endif
+# ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
+  return INLINE_VSYSCALL (clock_gettime64, 2, clock_id, tp);
 # else
-#  ifdef HAVE_CLOCK_GETTIME_VSYSCALL
+  return INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp);
-  return INLINE_VSYSCALL (clock_gettime, 2, clock_id, tp);
-#  else
-  return INLINE_SYSCALL_CALL (clock_gettime, clock_id, tp);
-#  endif
 # endif
 #else
   int r;
   /* Old 32-bit ABI with possible 64-bit time_t support.  */
 # ifdef __NR_clock_gettime64
+#  ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
+  r = INLINE_VSYSCALL (clock_gettime64, 2, clock_id, tp);
+#  else
   r = INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp);
+#  endif
   if (r == 0 || errno != ENOSYS)
     return r;
 # endif

sysdeps/unix/sysv/linux/dl-vdso-setup.c

@@ -45,6 +45,10 @@
 PROCINFO_CLASS int (*_dl_vdso_clock_gettime) (clockid_t,
 					      struct timespec *) RELRO;
 #endif
+# ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
+PROCINFO_CLASS int (*_dl_vdso_clock_gettime64) (clockid_t,
+						struct __timespec64 *) RELRO;
+#endif
 # ifdef HAVE_GETTIMEOFDAY_VSYSCALL
 PROCINFO_CLASS int (*_dl_vdso_gettimeofday) (struct timeval *, void *) RELRO;
 #endif

sysdeps/unix/sysv/linux/dl-vdso-setup.h

@@ -26,6 +26,9 @@ setup_vdso_pointers (void)
 #ifdef HAVE_CLOCK_GETTIME_VSYSCALL
   GLRO(dl_vdso_clock_gettime) = dl_vdso_vsym (HAVE_CLOCK_GETTIME_VSYSCALL);
 #endif
+#ifdef HAVE_CLOCK_GETTIME64_VSYSCALL
+  GLRO(dl_vdso_clock_gettime64) = dl_vdso_vsym (HAVE_CLOCK_GETTIME64_VSYSCALL);
+#endif
 #ifdef HAVE_GETTIMEOFDAY_VSYSCALL
   GLRO(dl_vdso_gettimeofday) = dl_vdso_vsym (HAVE_GETTIMEOFDAY_VSYSCALL);
 #endif

sysdeps/unix/sysv/linux/powerpc/sysdep.h

@@ -21,7 +21,11 @@
 
 /* List of system calls which are supported as vsyscalls.  */
 #define HAVE_CLOCK_GETRES_VSYSCALL	"__kernel_clock_getres"
+#if defined(__PPC64__) || defined(__powerpc64__)
+#define HAVE_CLOCK_GETTIME64_VSYSCALL	"__kernel_clock_gettime"
+#else
 #define HAVE_CLOCK_GETTIME_VSYSCALL	"__kernel_clock_gettime"
+#endif
 #define HAVE_GETCPU_VSYSCALL		"__kernel_getcpu"
 #define HAVE_TIME_VSYSCALL		"__kernel_time"
 #define HAVE_GETTIMEOFDAY_VSYSCALL      "__kernel_gettimeofday"

sysdeps/unix/sysv/linux/riscv/sysdep.h

@@ -126,7 +126,7 @@
 
 /* List of system calls which are supported as vsyscalls.  */
 # define HAVE_CLOCK_GETRES_VSYSCALL	"__vdso_clock_getres"
-# define HAVE_CLOCK_GETTIME_VSYSCALL	"__vdso_clock_gettime"
+# define HAVE_CLOCK_GETTIME64_VSYSCALL	"__vdso_clock_gettime"
 # define HAVE_GETTIMEOFDAY_VSYSCALL	"__vdso_gettimeofday"
 # define HAVE_GETCPU_VSYSCALL		"__vdso_getcpu"
 

sysdeps/unix/sysv/linux/s390/sysdep.h

@@ -21,6 +21,10 @@
 
 /* List of system calls which are supported as vsyscalls.  */
 #define HAVE_CLOCK_GETRES_VSYSCALL	"__kernel_clock_getres"
+#ifdef __s390x__
+#define HAVE_CLOCK_GETTIME64_VSYSCALL	"__kernel_clock_gettime"
+#else
 #define HAVE_CLOCK_GETTIME_VSYSCALL	"__kernel_clock_gettime"
+#endif
 #define HAVE_GETTIMEOFDAY_VSYSCALL	"__kernel_gettimeofday"
 #define HAVE_GETCPU_VSYSCALL		"__kernel_getcpu"

sysdeps/unix/sysv/linux/sparc/sysdep.h

@@ -45,7 +45,11 @@
 # define VDSO_HASH  61765110
 
 /* List of system calls which are supported as vsyscalls.  */
-# define HAVE_CLOCK_GETTIME_VSYSCALL	"__vdso_clock_gettime"
+# ifdef __arch64__
+#  define HAVE_CLOCK_GETTIME64_VSYSCALL	"__vdso_clock_gettime"
+# else
+#  define HAVE_CLOCK_GETTIME_VSYSCALL	"__vdso_clock_gettime"
+# endif
 # define HAVE_GETTIMEOFDAY_VSYSCALL	"__vdso_gettimeofday"
 
 #undef INLINE_SYSCALL

sysdeps/unix/sysv/linux/x86_64/sysdep.h

@@ -364,7 +364,7 @@
 # define VDSO_HASH  61765110
 
 /* List of system calls which are supported as vsyscalls.  */
-# define HAVE_CLOCK_GETTIME_VSYSCALL    "__vdso_clock_gettime"
+# define HAVE_CLOCK_GETTIME64_VSYSCALL  "__vdso_clock_gettime"
 # define HAVE_GETTIMEOFDAY_VSYSCALL     "__vdso_gettimeofday"
 # define HAVE_TIME_VSYSCALL             "__vdso_time"
 # define HAVE_GETCPU_VSYSCALL		"__vdso_getcpu"