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In Spectre there's no need for exceptions, you're directly (same process) or indirectly (syscall and HT siblings) mistraining the indirect branch predictor. Meltdown seems quite hard (impossible?) to exploit for JS, but I maybe wrong.
Spectre is two flaws, because the morons who named it mixed together two unrelated vulns. I'm talking about GPZ Variant 1, which is about direct branch misprediction. You can use the same technique to speculate through and recover from the exception.
