flat assembler - lea - value out of range

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hidden

Joined: 14 Feb 2007
Posts: 49

hidden 25 Apr 2007, 21:13

Code:

lea     ebx, [esp-0xB0000000] ; value out of range

But in OllyDbg:

Code:

7C90124C 8D9C24 00000050  LEA     EBX, DWORD PTR [ESP+50000000]

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25 Apr 2007, 21:13

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid 25 Apr 2007, 22:54

this is problem of point of view, not a "real" problem. As i see it, displacement is 32bit signed immediate, and -0xB0000000 doesn't fit into it.

It is something like wanting FASM to assemble "mov eax, 100000005h" to "mov eax, 5h".

25 Apr 2007, 22:54

hidden

Joined: 14 Feb 2007
Posts: 49

hidden 26 Apr 2007, 02:25

I don't see anything useful in it, but if it's not a bug, it's ok, I'll do it this way Smile

Code:

        lea     ebx, [esp+((-0xB0000000)and 0xFFFFFFFF)]

I just like to do something like this:

Code:

        or      al, 1
        and     al, not 1

instead of this:

Code:

        or      al, 1
        and     al, 0xFE

I think it looks more understandable. Smile

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26 Apr 2007, 02:25

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