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In the last post, I discussed how I implemented collaborative execution in SnowflakeOS through the iret instruction. Well, at that time the implementation wasn’t finished, even though I thought it was: I wasn’t restoring general purpose registers. This led to some pretty nice bugs, as pictured above. Context switching I noticed that issue and at first decided to tackle it my own way, moving the contents of my registers_t structure to the corresponding registers, but it proved a bit difficult. I...