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GDB has support for figuring out that the target is doing a longjmp and for stopping at the target of the jump, if we are stepping. This is done with a few specialized internal breakpoints, which are visible in the output of the ‘maint info breakpoint’ command.
To make this work, you need to define a function called gdbarch_get_longjmp_target, which will examine the jmp_buf structure and extract the longjmp target address. Since jmp_buf is target specific and typically defined in a target header not available to GDB, you will need to determine the offset of the PC manually and return that; many targets define a jb_pc_offset field in the tdep structure to save the value once calculated.