SLDT/STR

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Smi13

Joined: 14 Jun 2006
Posts: 2

Smi13 13 Oct 2006, 22:00

Code:

SLDT EAX ; 0F 00 C0
SLDT AX ; 66 0F 00 C0

-[Intel manual]
SLDT Ew
STR Ew
-

I think correct form:

Code:

SLDT AX ; 0F 00 C0
SLDT EAX ; Invalid operand

Same with STR instruction.

13 Oct 2006, 22:00

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8359
Location: Kraków, Poland

Tomasz Grysztar 14 Oct 2006, 07:10

Try executing them. Compare results.

PS. Check also this.

14 Oct 2006, 07:10

Smi13

Joined: 14 Jun 2006
Posts: 2

Smi13 14 Oct 2006, 07:57

Tomasz Grysztar wrote:

Try executing them. Compare results.
PS. Check also this.

Right, first time i tring with zero register and found no difference.
Intel manual writen too crappy :)

Useful link, i write own assemble/disassemble engine so iteresting in instruction encoding.

Description:		Download
Filename:	ADE86-01.ZIP
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Downloaded:	361 Time(s)

14 Oct 2006, 07:57

MazeGen

Joined: 06 Oct 2003
Posts: 977
Location: Czechoslovakia

MazeGen 14 Oct 2006, 09:08

Smi, you probably use some older revision of the manual. The latest revision which I can check now is 019 and it says correctly:

Code:

SLDT Rv/Mw
STR Rv/Mw

And there are more instructions with such strange operands.

14 Oct 2006, 09:08

Goplat

Joined: 15 Sep 2006
Posts: 181

Goplat 14 Oct 2006, 14:37

That is odd. Does it really change the whole register even though the LDTR is only 16 bit?

14 Oct 2006, 14:37

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