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linux: Add support for clock_getres64 vDSO

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No architecture currently defines the vDSO symbol.  On archictures
with 64-bit time_t the HAVE_CLOCK_GETRES_VSYSCALL is renamed to
HAVE_CLOCK_GETRES64_VSYSCALL, it simplifies clock_gettime code.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
Adhemerval Zanella 2019-12-11 16:39:01 -03:00
parent cdae973b6a
commit 0dc1a378b1
8 changed files with 24 additions and 12 deletions
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2
sysdeps/unix/sysv/linux/aarch64/sysdep.h
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@ -160,7 +160,7 @@
# endif
/* List of system calls which are supported as vsyscalls. */
# define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
# define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres"
# define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
# define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday"

17
sysdeps/unix/sysv/linux/clock_getres.c
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@ -30,20 +30,23 @@ __clock_getres64 (clockid_t clock_id, struct __timespec64 *res)
{
#ifdef __ASSUME_TIME64_SYSCALLS
/* 64 bit ABIs or Newer 32-bit ABIs that only support 64-bit time_t. */
# ifdef __NR_clock_getres_time64
return INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
# ifndef __NR_clock_getres_time64
# define __NR_clock_getres_time64 __NR_clock_getres
# endif
# ifdef HAVE_CLOCK_GETRES64_VSYSCALL
return INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
# else
# ifdef HAVE_CLOCK_GETRES_VSYSCALL
return INLINE_VSYSCALL (clock_getres, 2, clock_id, res);
# else
return INLINE_SYSCALL_CALL (clock_getres, clock_id, res);
# endif
return INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
# endif
#else
int r;
/* Old 32-bit ABI with possible 64-bit time_t support. */
# ifdef __NR_clock_getres_time64
# ifdef HAVE_CLOCK_GETRES64_VSYSCALL
r = INLINE_VSYSCALL (clock_getres_time64, 2, clock_id, res);
# else
r = INLINE_SYSCALL_CALL (clock_getres_time64, clock_id, res);
# endif
if (r == 0 || errno != ENOSYS)
return r;
# endif

4
sysdeps/unix/sysv/linux/dl-vdso-setup.c
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@ -62,6 +62,10 @@ PROCINFO_CLASS int (*_dl_vdso_getcpu) (unsigned *, unsigned *, void *) RELRO;
PROCINFO_CLASS int (*_dl_vdso_clock_getres) (clockid_t,
struct timespec *) RELRO;
# endif
# ifdef HAVE_CLOCK_GETRES64_VSYSCALL
PROCINFO_CLASS int (*_dl_vdso_clock_getres_time64) (clockid_t,
struct __timespec64 *) RELRO;
# endif
/* PowerPC specific ones. */
# ifdef HAVE_GET_TBFREQ

3
sysdeps/unix/sysv/linux/dl-vdso-setup.h
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@ -41,6 +41,9 @@ setup_vdso_pointers (void)
#ifdef HAVE_CLOCK_GETRES_VSYSCALL
GLRO(dl_vdso_clock_getres) = dl_vdso_vsym (HAVE_CLOCK_GETRES_VSYSCALL);
#endif
#ifdef HAVE_CLOCK_GETRES64_VSYSCALL
GLRO(dl_vdso_clock_getres_time64) = dl_vdso_vsym (HAVE_CLOCK_GETRES64_VSYSCALL);
#endif
#ifdef HAVE_GET_TBFREQ
GLRO(dl_vdso_get_tbfreq) = dl_vdso_vsym (HAVE_GET_TBFREQ);
#endif

3
sysdeps/unix/sysv/linux/powerpc/sysdep.h
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@ -20,10 +20,11 @@
#define VDSO_HASH 123718565
/* 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_GETRES64_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
#else
#define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME_VSYSCALL "__kernel_clock_gettime"
#endif
#define HAVE_GETCPU_VSYSCALL "__kernel_getcpu"

2
sysdeps/unix/sysv/linux/riscv/sysdep.h
View File

@ -125,7 +125,7 @@
# define VDSO_HASH 182943605
/* List of system calls which are supported as vsyscalls. */
# define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres"
# define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
# define HAVE_CLOCK_GETTIME64_VSYSCALL "__vdso_clock_gettime"
# define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"

3
sysdeps/unix/sysv/linux/s390/sysdep.h
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@ -20,10 +20,11 @@
#define VDSO_HASH 123718585
/* List of system calls which are supported as vsyscalls. */
#define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
#ifdef __s390x__
#define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
#else
#define HAVE_CLOCK_GETRES_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME_VSYSCALL "__kernel_clock_gettime"
#endif
#define HAVE_GETTIMEOFDAY_VSYSCALL "__kernel_gettimeofday"

2
sysdeps/unix/sysv/linux/x86_64/sysdep.h
View File

@ -368,7 +368,7 @@
# define HAVE_GETTIMEOFDAY_VSYSCALL "__vdso_gettimeofday"
# define HAVE_TIME_VSYSCALL "__vdso_time"
# define HAVE_GETCPU_VSYSCALL "__vdso_getcpu"
# define HAVE_CLOCK_GETRES_VSYSCALL "__vdso_clock_getres"
# define HAVE_CLOCK_GETRES64_VSYSCALL "__vdso_clock_getres"
# define SINGLE_THREAD_BY_GLOBAL 1