From: vic3dexe@gmail.com
To: malc <av1474@comtv.ru>
Cc: Bug 600589 <600589@bugs.launchpad.net>,
qemu-devel@nongnu.org, Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop
Date: Fri, 2 Jul 2010 22:13:00 +0300 [thread overview]
Message-ID: <275366227.20100702221300@gmail.com> (raw)
In-Reply-To: <alpine.LNX.2.00.1007012042260.17554@linmac>
You wrote 1 июля 2010 г., 19:43:06:
> On Thu, 1 Jul 2010, Richard Henderson wrote:
>> On 07/01/2010 05:04 AM, Vic3Dexe wrote:
>> > Public bug reported:
>> >
>> > xchg r8,rax (49h 90h) executed as nop (90h) in long mode, in other words
>> > REX not used.
>> >
>> > qemu 0.12.4, host Win 7 x64, running qemu-system-x86_64.exe.
>> >
>> > ** Affects: qemu
>> > Importance: Undecided
>> > Status: New
>> >
>>
>> Verified. Test case for x86_64-linux-user:
>>
>> .globl main
>> .type main, @function
>> main:
>> movl $0, %r8d
>> movl $1, %eax
>> xchgq %r8, %rax
>> ret
>>
>> Expected result is exit status 0.
>>
> 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?
--
Best regards,
Vic3dexe mailto:vic3dexe@gmail.com
next prev parent reply other threads:[~2010-07-02 19:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-01 12:04 [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop Vic3Dexe
2010-07-01 16:17 ` Richard Henderson
2010-07-01 16:42 ` [Qemu-devel] [PATCH] target-i386: Fix xchg rax,r8 Richard Henderson
2010-07-01 21:52 ` Aurelien Jarno
2010-07-01 16:43 ` [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop malc
2010-07-02 19:13 ` vic3dexe [this message]
2010-07-02 20:08 ` Richard Henderson
2010-07-06 13:00 ` [Qemu-devel] [Bug 600589] " Jes Sorensen
2011-02-20 17:13 ` Aurelien Jarno
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