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The exception initialization and handling in gcc_eh allocates early (_main) memory before executing main. In Vancouver the virtual region from [0,VM size) must be reserved. Vancouver fails if the memory allocated by the exception handling and the static objects was allocated inside the [0, VM size) area. To circumvent the situation allocate the first memory pieces for the heap from the bss.
This is generic part of the Genode implementation. It consists of two parts: :_Core_: is the ultimate root of the Genode application tree and provides abstractions for the lowest-level hardware resources such as RAM, ROM, CPU, and generic device access. All generic parts of Core can be found here - for system-specific implementations refer to the appropriate 'base-<system>' directory. :_Base libraries and protocols_: that are used by each Genode component to interact with other components. This is the glue that holds everything together.