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26 Prevent exceptions from being taken while stalling

Jumping to an exception handler while stalling and waiting for a load/store
instruction to finish can cause undefined results from the load/store
instruction. This actually fixes the issue mentioned in revision r20.
skordal 3326d 21h /
25 Add placeholder cache modules and a wishbone arbiter skordal 3329d 01h /
24 Remove unused STRINGIFY macros skordal 3329d 14h /
23 Create branch to use for implementing a cache skordal 3329d 14h /
22 Fix the potato_get_badvaddr() macro skordal 3329d 15h /
21 Upgrade the example design to use a 60 MHz system clock skordal 3329d 15h /
20 Fix SHA256 benchmark crash by storing all registers on exception handler entry

This problem will disappear when the processor is updated to conform to the
new supervisor specification, which will allow us to use a compiler that
conforms to the new "official" ABI.
skordal 3329d 15h /
19 SHA256 benchmark: allow compiler to inline at will skordal 3329d 15h /
18 instr_misalign_check: add do_jump to sensitivity list skordal 3331d 15h /
17 Improve detection of unaligned instructions skordal 3335d 22h /

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