flat assembler

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pool

Joined: 08 Jan 2007
Posts: 97

pool 28 Aug 2008, 02:18

Last edited by pool on 17 Mar 2013, 12:03; edited 1 time in total

28 Aug 2008, 02:18

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 28 Aug 2008, 02:39

Code:

org 256
uninitialized db ?

dolar dw $
dolar_dolar dw $$

uninitialized_garbage db ?

dolar = 257
dolar_dolar = 256

uninitialized = 0 (because more DEFINED data or instructions followed and hence the space was padded with zero)
uninitialized_garbage = ??? (only known at run-time)

And of course, RTFM Smile

28 Aug 2008, 02:39

asmhack

Joined: 01 Feb 2008
Posts: 431

asmhack 28 Aug 2008, 02:55

pool wrote:

i dont understand whats the value of $ and $$

assemble the code below and open the executable with ollydbg
you will find the answer alone, trust me Wink

even if you never used ollydbg before (well this is a good start..)

Code:

include 'win32ax.inc'

.code
go:
nop
mov eax,$
mov eax,$$
invoke ExitProcess,0
.end go

now the answer for your second question is also very easy to find...
just open the fasm.pdf, hit ctrl+f, write "?" in the textbox and hit enter...

28 Aug 2008, 02:55

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 28 Aug 2008, 06:06

$ is the current assembly offset.
$$ is the offset of the beginning of the current section.

28 Aug 2008, 06:06

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