[Libre-soc-bugs] [Bug 421] TRAP pipeline formal correctness proof needed

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Mon Jul 20 23:27:15 BST 2020


--- Comment #13 from Samuel A. Falvo II <kc5tja at arrl.net> ---
I should be more precise; I can find the instruction pseudo-code for TWI, et.
al. easily enough.  What's missing is when the pseudocode says "TRAP" and
dead-ends there.  What does that mean, precisely?  Even the chapter on
Interrupts says that the behavior of traps is dependent on what causes the
trap, and unless I missed something, nothing in that chapter mentions any of
the trap instructions outside of system call.  I cannot find the place in the
specs where fixed-point facility traps are discussed (even if only by

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