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I've been working on my OS again after a break, but after I setup syscalls, strange things started happening.
I initialise syscalls, switch to user mode, and then call a syscall version of puts. The result: "unhandled exception 0xf0". I didn't even know there was an exception that high, or is it a bug in the handler?
Problem solved. The interrupt handler pushed an invalid pointer each time an interrupt was called. Since I haven't built-in a sanity check on the interrupt number, I just took it for what it seemed. This led to this error.
Thanks!