Build exception table for fallible memcpy
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Since Aug 25, 2025.
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Description
See #276
Note that read from/write to user space pointer in kernel mode should not panic. Instead, it should be able to resume the execution and return an error. Linux achieves this through building an exception table: https://elixir.bootlin.com/linux/v5.19.17/source/arch/x86/mm/fault.c#L1327.
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