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linux: Add support for clock_gettime64 vDSO

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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>
This commit is contained in:
Adhemerval Zanella
2019-12-11 11:13:50 -03:00
parent 1bdda52fe9
commit ff500a623d
9 changed files with 34 additions and 12 deletions
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19
sysdeps/unix/sysv/linux/clock_gettime.c
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@ -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. */
# ifdef __NR_clock_gettime64
return INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp);
/* 64 bit ABIs or newer 32-bit ABIs that only support 64-bit time_t. */
# ifndef __NR_clock_gettime64
# 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_VSYSCALL (clock_gettime, 2, clock_id, tp);
# else
return INLINE_SYSCALL_CALL (clock_gettime, clock_id, tp);
# endif
return INLINE_SYSCALL_CALL (clock_gettime64, clock_id, tp);
# 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