Autah-gr.334
net.unix-wizards
utcsrgv!utzoo!decvax!duke!chico!harpo!utah-cs!utah-gr!thomas
Tue Mar 16 12:33:50 1982
Vax microcode bug
We just got this message from our FE. Looks like it MIGHT explain the
microcode problem I asked about a little while ago.
=Spencer Thomas
From MAINT@UTAH-20 Tue Mar 16 10:58:08 1982
Date: 16 Mar 1982 0932-MST
From: DEC Service-Tom <MAINT UTAH-20 AT>
Subject: VAX MICROCODE
To: FRANK
Remailed-date: 16 Mar 1982 1044-MST
Remailed-from: Randy Frank <FRANK UTAH-20 AT>
Remailed-to: lepreau at UTAH-20, thomas at UTAH-20
RANDY
VERSION 94 OF THE VAX MICROCODE, SHOULD TAKE CARE OF YOUR PROBLEMS.
THE LIST IS TOO LONG TO LIST ENTIRELY, BUT OF MAIN CONCERN (I BELIEVE)
IS PROBLEM 1, WHICH SAYS:
"UNALIGNED MODIFY OPERANDS ACROSS PAGE BOUNDRIES"
PROBLEM: THIS BUG AFFECTS ANY INSTRUCTION THAT
1. MODIFIES AN OPERAND, AND
2. THE OPERAND IS UNALIGNED AND CROSSES A PAGE BOUNDRY, AND
3. THERE IS A TRANSLATION BUFFER HIT FOR BOTH THE FIRST AND
SECOND PAGES, AND
4. THE SECOND PAGE HAS NOT BEEN MODIFIED..... PTE<M>=0, AND
5. AN INTERRUPT IS PENDING.
THERE ARE SEVERAL MORE BUGS, BUT THIS IS THE |ONE THAT SOUNDS
MOST LIKELY TO ME.
I WILL SEE WHAT I CAN DO TO GET THE ECO AS SOON AS POSSIBLE.
IT IS SUPPOSSED TO COME AUTOMATICALLY AS RELEASE 3 OF THE VAX.
I WILL PUSH FOR SPEEDY DELIVERY
TOM
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