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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 3323d 01h /potato/trunk/
24 Remove unused STRINGIFY macros skordal 3325d 19h /potato/trunk/
22 Fix the potato_get_badvaddr() macro skordal 3325d 19h /potato/trunk/
21 Upgrade the example design to use a 60 MHz system clock skordal 3325d 20h /potato/trunk/
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 3325d 20h /potato/trunk/
19 SHA256 benchmark: allow compiler to inline at will skordal 3325d 20h /potato/trunk/
18 instr_misalign_check: add do_jump to sensitivity list skordal 3327d 20h /potato/trunk/
17 Improve detection of unaligned instructions skordal 3332d 03h /potato/trunk/
16 Correct grammar in source code comment skordal 3332d 03h /potato/trunk/
15 SHA256 benchmark: fix Makefile syntax error skordal 3338d 20h /potato/trunk/
14 Improve detection of invalid instructions skordal 3338d 20h /potato/trunk/
13 Add SHA256 benchmark code skordal 3339d 01h /potato/trunk/
12 Update example design with correct bug-report URL and testbenches skordal 3339d 03h /potato/trunk/
11 Correct FIFO file header skordal 3339d 03h /potato/trunk/
10 Add missing FIFO module skordal 3343d 21h /potato/trunk/
9 Remove dependency on a non-existent target in the Makefile skordal 3343d 21h /potato/trunk/
8 Clarify instruction ROM naming in the example design README skordal 3350d 23h /potato/trunk/
7 Add test design for the Nexys 4 board from Digilent skordal 3351d 00h /potato/trunk/
6 Add ISA tests skordal 3351d 00h /potato/trunk/
5 Update the README, remove .md extension skordal 3353d 05h /potato/trunk/

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