Print Page - nasm/ Entry 386 question

Title: nasm/ Entry 386 question
Post by: lly99 on April 05, 2008, 06:22:55 AM

:dazzled:

Entry 386:

Hello EveryBody

xor   eax, eax
   mov   ax, cs
   shl   eax, 4
   add   eax, LABEL_SEG_CODE32
   mov   word [LABEL_DESC_CODE32 + 2], ax
   shr   eax, 16
   mov   byte [LABEL_DESC_CODE32 + 4], al
   mov   byte [LABEL_DESC_CODE32 + 7], ah

shl   eax, 4 ;(??????????? why?)
thanks

Title: Re: nasm/ Entry 386 question
Post by: jj2007 on April 05, 2008, 07:33:39 AM

xor eax, eax ; eax=0
mov ax, cs ; eax=cs
shl eax, 4 ; eax=cs*16

Title: Re: nasm/ Entry 386 question
Post by: lly99 on April 05, 2008, 07:46:57 AM

Thank you very much!!!! :bg

:U

Title: Re: nasm/ Entry 386 question
Post by: Ian_B on April 05, 2008, 11:22:39 AM

Quote from: lly99 on April 05, 2008, 06:22:55 AM
xor eax, eax
mov ax, cs

If you are using this code yourself, this might be a simpler replacement:

movzx eax, cs

Regards.

Title: Re: nasm/ Entry 386 question
Post by: lly99 on April 06, 2008, 06:42:29 AM

Quote from: Ian_B on April 05, 2008, 11:22:39 AM
Quote from: lly99 on April 05, 2008, 06:22:55 AM
xor eax, eax
mov ax, cs

If you are using this code yourself, this might be a simpler replacement:

movzx eax, cs

Regards.

Yes movzx eax, cs ; zero fill :clap:

The MASM Forum Archive 2004 to 2012

General Forums => The Workshop => Topic started by: lly99 on April 05, 2008, 06:22:55 AM