[Bug 256905] Missing clock_gettime VDSO on RISC-V

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 30 Jun 2021 14:30:23 UTC

            Bug ID: 256905
           Summary: Missing clock_gettime VDSO on RISC-V
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: riscv
          Assignee: riscv@FreeBSD.org
          Reporter: arichardson@FreeBSD.org

I just ran truss on a Qt application and saw tons of clock_gettime syscalls.
Looking at it in GDB shows that __vdso_clock_gettime returns ENOSYS.

It appears that riscv_timer_timecount does not have a tc_fill_vdso_timehands
function, so the tc_fill_vdso_timehands() function will always return 0.

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