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Index > Compiler Internals > VT-x instructions problem

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Hunter



Joined: 07 Jun 2006
Posts: 41
Hunter
Hello! I've tried to use 64-bit VMX instructions like
VMREAD qword [rbx], rax
VMWRITE rax, qword [rbx]
but got error "Invalid size of operand". In the Intel manual volume 2B is written:
VMREAD r/m64, r64
VMWRITE r64, r/m64
But FASM allows to use only the following syntax:
vmread qword [rbx], eax
vmwrite eax, qword [rbx]
Is it right?
Post 20 May 2008, 06:48
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
I personally wouldn't be surprised if VT-x instructions were broken... Intel has some mistakes in manual, because of which we don't know which way the rm/r or r/rm is.
Post 20 May 2008, 06:53
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Hunter



Joined: 07 Jun 2006
Posts: 41
Hunter
No, I think it's equal to instructions like mov cr0, rax. Such instructions are 64-bit by default.
Post 20 May 2008, 08:01
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
oh... I missed your point. I thouth you was speaking about order of "rm/r" or "r/rm", because this is quite unclear from manual.

Seems that these instructions are REALLY broken Smile I'll move it to compiler internals for Tomasz.
Post 20 May 2008, 08:30
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7801
Location: Kraków, Poland
Tomasz Grysztar
Fixed in 1.67.28.
Post 09 Jul 2008, 16:53
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Mac2004



Joined: 15 Dec 2003
Posts: 313
Mac2004
Tomasz Grysztar wrote:
Fixed in 1.67.28.


Version 1.67.26 seems to be present at the download section, but I cannot find version 1.67.28.

Regards,
Mac2004
Post 11 Jul 2008, 08:11
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7801
Location: Kraków, Poland
Tomasz Grysztar
Because it's not released yet - I still have couple more of bugs to fix.

Neverthelress, since I forgot to release 1.67.27 in the meantime anyway, I'm renaming it back to 1.67.27 - with this number it will get released soon.
Post 11 Jul 2008, 09:19
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Mac2004



Joined: 15 Dec 2003
Posts: 313
Mac2004
Ok, I'll be waiting to get a copy of version 1.67.27. Smile

regrads,
Mac2004
Post 12 Jul 2008, 06:46
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