1. A hardware debugging system for debugging a fabricated electronic system having design instrumentation circuitry included therein, wherein the fabricated electronic system is fabricated in accordance with an HDL description, the hardware debugging system comprising: an instrumentor configured to receive a high level HDL description of the fabricated electronic system, to determine aspects of the fabricated electronic system to be examined or modified during debugging, to determine additional design instrumentation circuitry to be incorporated into the fabricated electronic system to facilitate debugging, and to implement at least a portion of the design instrumentation circuitry in a reconfigurable FPGA core embedded in an ASIC product; and an HDL-based hardware debugger (HHD) configured to debug the fabricated electronic system while the fabricated electronic system operates at a target speed and in a target system by using the additional design instrumentation circuitry to interact with the fabricated electronic system and to present debug information with respect to the high level HDL description.