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Re: [Qemu-ppc] [Qemu-devel] Bad icount read when running qemu-system-ppc

From: Darrell Leinwand
Subject: Re: [Qemu-ppc] [Qemu-devel] Bad icount read when running qemu-system-ppc64 and mfspr atbu guest instruction
Date: Thu, 12 Apr 2018 02:37:52 +0000

Ah I see, that makes sense and the atb instructions are marked as unused in the 
mainline which when I compared I recall now that we modifed them because the 
guest software we are running is trying to use those special registers. 

I added the wrappers into those function, is that correct?

Thanks for the help.


On 4/11/18, 4:39 PM, "Richard Henderson" <address@hidden> wrote:

    On 04/12/2018 04:18 AM, Darrell Leinwand wrote:
    > Hi,
    > When I enable icount using an e5500 core I get an exit with “Bad icount
    > read” when the guest software executes a load atbu command.
    Yep, it looks like there are some bugs in the ppc front end wrt icount.
    In target/ppc/translate_init.c, spr_read_tbu has the proper wrappers for
    integrating with icount, but a few lines lower spr_read_atbl and 
    do not.
    This will probably have to wait until the 2.13 cycle to fix...
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