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communications protocol and m0,4

From: Programmingkid <programmingkidx at gmail dot com>
To: gdb at sourceware dot org
Date: Sun, 8 Jun 2014 17:59:13 -0400
Subject: communications protocol and m0,4
Authentication-results: sourceware.org; auth=none

I have noticed that QEMU 7.7.1 sends m0,4 to a program I am debugging. Is this command valid. I thought access to address zero was forbidden. Any thoughts are welcome.

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