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Re: [Qemu-trivial] [PATCH] Possible wrong microMIPS opcode encoding


From: Wei-Ren Chen
Subject: Re: [Qemu-trivial] [PATCH] Possible wrong microMIPS opcode encoding
Date: Thu, 15 Nov 2012 07:57:04 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Wed, Nov 14, 2012 at 05:45:21PM +0100, Aurelien Jarno wrote:
> On Wed, Nov 14, 2012 at 10:49:55AM +0800, 陳韋任 (Wei-Ren Chen) wrote:
> > Hi all,
> > 
> >   While reading microMIPS decoding, I found a possible wrong opcode
> > encoding. According to [1] page 337, the bits 13..12 for MULTU is
> > 0x01 rather than 0x00. Please review, thanks.
> > 
> > [1] MIPS Architecture for Programmers VolumeIV-e: The MIPS DSP
> >     Application-Specific Extension to the microMIPS32 Architecture
> 
> This is indeed correct, but I guess the page you meant is 166. Page 337
> refers to the original MULTU instruction from the MIPS Architecture for
> Programmers Volume II-B: The microMIPS32 Instruction Set.
> 
> On the other the microMIPS32 encoding for DSP instruction is not yet
> supported.

  Maybe we can start cleanup it a little bit. ;) Is this OK to commit?

Regards,
chenwj 

-- 
Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj



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