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and a useful example one ;)
this also involved fixing the failure cases in input.e to handle EINTR correctly. it required a lot of tracing, but now the expected state of the stack is much better commented for next time.
many thanks to @cks@mastodon.social who found code in the Go compiler which had the details of what's required in regard to the restorer, which made the whole thing work, and to @snowfox@tech.lgbt who did some experimental testing around the exact requirements. both those contributions are reflected in the documentation added with this CL. additional thanks to everyone who chimed in on the fedi thread, your comments kept us going!
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Change-Id: I97fd89426bf807df5565e011d3665f7e904fa138
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this turns out to be fairly involved. hex bootstrap can't come fast enough ;)
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Change-Id: Ide5d2207d745ad07c40d3c9f457cd6b491bfbcf0
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so okay, now all the machine code stuff is implemented and it builds without crashing
the generated executable still crashes though, but this was enough work that it's getting a celebratory check-in
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Change-Id: I201e6912253647da58ef3537c735b478b0dca9fb
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Change-Id: I273879e9d05260db0603bc5a36970e240f3e366a
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