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X86-64 podle manuálu Intel, 1.0

 
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MazeGen
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Joined: 05 Sep 2007
Posts: 98
Location: .cz
PostPosted: Fri Dec 19, 2008 8:43 am    Post subject: X86-64 podle manuálu Intel, 1.0 Reply with quote
Diskuze k článku X86-64 podle manuálů Intel.

Quote:
Překvapuje mě, jak málo programátorů v asembleru při práci používá asi nejkvalitnější zdroj infomací - oficiální procesorové manuály, ať už od Intelu nebo AMD. Proto vzniknula tato příručka, která by vás měla krok za krokem provést spletitostí manuálů od Intelu při poznávání architektury x86-64.
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steve
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PostPosted: Fri Jan 16, 2009 11:31 pm    Post subject: pushad/popad Reply with quote
I just wonder,why pushad/popad aren't valid anymore.
Is there any clear explanation for it ?
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MazeGen
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Joined: 05 Sep 2007
Posts: 98
Location: .cz
PostPosted: Sat Jan 17, 2009 8:20 am    Post subject: Reply with quote
Hi steve,

my personal opinion is that in 64-bit mode, PUSHAQ/POPAQ would push 64×16 (there are 16 general registers 64 bits wide) = 1024 bytes and this is quite a big piece of memory.

As for PUSHAD/POPAD, they wouldn't be encodable because of the issue I mentioned here:

http://x86asm.net/articles/x86-64-tour-of-intel-manuals/#Default-64-bit-operand

Quote:
The second group of instructions (which includes PUSH etc.) has much bigger consequences for an assembly programmer. It means that instruction like PUSH EAX cannot be used, only PUSH RAX (or PUSH AX with prefix 66).


And PUSHA/POPA (16-bit variant of PUSHAQ/POPAQ) wouldn't be of much use.

Anyway, the best place to ask should be here:

http://forums.amd.com/forum/

BTW, this topic is dedicated for Czech version od the article. The english one is here:

http://board.x86asm.net/viewtopic.php?t=13
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