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List:       kde-bugs-dist
Subject:    [Bug 172417] vex x86->IR: unhandled instruction bytes: 0x82 0xE4
From:       Tom Hughes <tom () compton ! nu>
Date:       2008-10-31 14:35:05
Message-ID: 20081031143505.88CF010663 () immanuel ! kde ! org
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http://bugs.kde.org/show_bug.cgi?id=172417


Tom Hughes tom compton nu changed:

           What    |Removed                     |Added
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                 CC|                            |tom@compton.nu




--- Comment #6 from Tom Hughes <tom compton nu>  2008-10-31 15:35:02 ---
My copy of the AMD docs (rev 3.11 of volume 3 of the AMD64 manual, document
number 24594) seem to list it in the table on page 380. Specifically:

  0x82 0xE4

would decode as opcode 0x82/4 (the 4 coming from bits 3-5 of the modrm byte)
which is:

  AND Eb, Ib

It's only valid in 32 bit mode though.

It isn't listed on pages 69-70 in the main AND opcode description though - that
uses the alternate 0x80/4 encoding which is also valid in 64 bit mode.

The Intel manual appears to concur - it isn't listed under the main opcode
description but is shown in the opcode map.


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