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Hello,

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?

I could really use some help Thanks!

Here's a screen shot.

CPU exceptions only range from 0x00 to 0x1F. You must be receiving the interrupt for some other reason.

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 anyways!