function::registers_valid - Determines validity of register and u_register in current context

       None

       This function returns 1 if register and u_register can be used in the current context, or 0 otherwise.
       For example, registers_valid returns 0 when called from a begin or end probe.

       function::registers_valid - Determines validity of register and u_register in current context

tapset::context(3stap)

SystemTap Tapset Reference                         April 2024                        FUNCTION::REGISTERS_(3stap)

           registers_valid:long()