Format binary strang output code

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Roman

Joined: 21 Apr 2012
Posts: 1796

Roman 22 Jan 2017, 11:58

I do in Fasm 1.69.03 and the same result in Fasm 1.71:

Code:

format binary
nop
mov eax,11
ret

Look in IDA Pro and see:

Code:

seg000:00000000                 db 90h
seg000:00000001                 db  66h ; f
seg000:00000002 ;               ------------------------
seg000:00000002                 mov     eax, 0Bh
seg000:00000007                 retn

My question why fasm put in bin file unnecessary 66h ?!
I tested this in my program

Code:

db 0xb8,11,0,0,0

And i get mov eax,11 !!!

Last edited by Roman on 22 Jan 2017, 12:05; edited 1 time in total

22 Jan 2017, 11:58

Roman

Joined: 21 Apr 2012
Posts: 1796

Roman 22 Jan 2017, 12:01

If i write this code, bin file correct and not have 66h

Code:

format binary
nop
;mov eax,11
db 0xb8,11,0,0,0
ret

22 Jan 2017, 12:01

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20343
Location: In your JS exploiting you and your system

revolution 22 Jan 2017, 13:10

If you need 32-bit code then you can use use32.

Code:

format binary
use32
mov eax,11

22 Jan 2017, 13:10

Roman

Joined: 21 Apr 2012
Posts: 1796

Roman 22 Jan 2017, 14:30

Thanks

22 Jan 2017, 14:30

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