PR_RISCV_V_VSTATE_CTRL_MASK
tsk->thread.vstate_ctrl &= ~PR_RISCV_V_VSTATE_CTRL_MASK;
return current->thread.vstate_ctrl & PR_RISCV_V_VSTATE_CTRL_MASK;
if (arg & ~PR_RISCV_V_VSTATE_CTRL_MASK)