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We read() a character from stdin and write() it out to stdout, saving it
to a global variable in between.
ELF binaries are inefficient; you can ask for a low alignment, but the
kernel may not be able to handle it. If you set up a high alignment then
you end up wasting an increasing amount of space in each segment
because of the constraint that the offset bear some relationship with
the loaded address.
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Reorganize layers to introduce the translation workflow right at the start.
We also avoid duplicating parsing code. Programs are always parsed into
the `program` data structure.
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ex4 now writes to the (global) data segment, rather than trying to write
to the code segment.
We still need to specify the other segments in the generated ELF,
though.
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Currently only runs in emulated mode. Likely a paging issue, writing
data to code page. I'm not checking the return value.
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