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Date: Fri, 2 Jul 2010 22:13:00 +0300
From: vic3dexe@gmail.com
Message-ID: <275366227.20100702221300@gmail.com>
Subject: Re: [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop
In-Reply-To: <alpine.LNX.2.00.1007012042260.17554@linmac>
References: <20100701120434.6052.96178.malonedeb@potassium.ubuntu.com>
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To: malc <av1474@comtv.ru>
Cc: Bug 600589 <600589@bugs.launchpad.net>, qemu-devel@nongnu.org, Richard Henderson <rth@twiddle.net>

You wrote 1 =E8=FE=EB=FF 2010 =E3., 19:43:06:

> On Thu, 1 Jul 2010, Richard Henderson wrote:

>> On 07/01/2010 05:04 AM, Vic3Dexe wrote:
>> > Public bug reported:
>> >=20
>> > xchg r8,rax (49h 90h) executed as nop (90h) in long mode, in other wor=
ds
>> > REX not used.
>> >=20
>> > qemu 0.12.4, host Win 7 x64,  running qemu-system-x86_64.exe.
>> >=20
>> > ** Affects: qemu
>> >      Importance: Undecided
>> >          Status: New
>> >=20
>>=20
>> Verified.  Test case for x86_64-linux-user:
>>=20
>>       .globl  main
>>       .type   main, @function
>> main:
>>       movl    $0, %r8d
>>       movl    $1, %eax
>>       xchgq   %r8, %rax
>>       ret
>>=20
>> Expected result is exit status 0.
>>=20

> No surprise really:

> target-i386/translate.c lines 6665-...

>     case 0x90: /* nop */
>         /* XXX: xchg + rex handling */
>         /* XXX: correct lock test for all insn */

> The code to handle that just isn't there.

Sorry for inconvenience, I just forgot to look in source. :)
Do you plan to fix it in the near future?

--=20
Best regards,
 Vic3dexe                          mailto:vic3dexe@gmail.com