Since it is impossible for a pro- gram to overwrite itself


Various computers and operating systems in the past have used separate instruction and data spaces, allowing up to 2k program addresses and also 2k data addresses using a k- bit address. For example, for k = 32, a program could access 4 GB of instructions and also 4 GB of data, for a total address space of 8 GB. Since it is impossible for a pro- gram to overwrite itself when this scheme is in use, how could the operating system load programs into memory?

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Operating System: Since it is impossible for a pro- gram to overwrite itself
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