18.1.6. Self-hosted debug

We have seen how the ARM architecture provides a wide range of features accessible to an external debugger. Many of these facilities can also be used by software running on the core, a debug monitor that is resident on the target system. Monitor systems can be inexpensive, as they might not require any additional hardware. However, they take up memory space in the system and can only be used if the target system itself is actually running. They are of little value on a system that does not at least boot correctly.

To assist developers creating applications, platforms require development tools that often run, at least in part, on the application processor itself rather than requiring expensive interface hardware to connect a second host computer. The ARMv8-A architecture refines the architecture support for this self-hosted form of debug. On existing desktop platforms, self-hosting is the prevalent method for software development.

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