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Index > Macroinstructions > Compatibility with "dword ptr [xxx]", etc from MAS

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alorent



Joined: 05 Dec 2005
Posts: 201
alorent
Hello guys,

Is there any way that I can use the "PTR" keyword in FASM like in MASM when accessing to a memory address?

Example:

mov eax, dword ptr [ebx]

I know that FASM is more friendly and does not need the "PTR" but I have some code to convert and I'm also quite used to "PTR" keyword.

I have tried the following macro with no success:

macro PTR { }

Trying to assign it to "nothing" but it doesn't seem to do the job.

Any ideas?

Thanks a lot!!!
Post 17 Apr 2008, 11:34
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edfed



Joined: 20 Feb 2006
Posts: 4237
Location: 2018
edfed
manual of fasm

Quote:

When operand is a data in memory, the address of that data (also any numerical expression, but it may contain registers) should be enclosed in square brackets or preceded by ptr operator. For example instruction mov eax,3 will put the immediate value 3 into the EAX register, instruction mov eax,[7] will put the 32-bit value from the address 7 into EAX and the instruction mov byte [7],3 will put the immediate value 3 into the byte at address 7, it can also be written as mov byte ptr 7,3. To specify which segment register should be used for addressing, segment register name followed by a colon should be put just before the address value (inside the square brackets or after the ptr operator).



use seek and replace tool:
"ptr" ==> "nothing"

note fasm macro are case sensitive, if the name of macro is PTR in order to replace ptr, it will not work.
Post 17 Apr 2008, 11:48
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
You can use "fix" or "equ", but redefining syntax keywords is not really the best idea. In FASM, "ptr" works differently
Post 17 Apr 2008, 11:55
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17279
Location: In your JS exploiting you and your system
revolution
Code:
...
ptr equ
...    
ought to do the trick
Post 17 Apr 2008, 12:56
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alorent



Joined: 05 Dec 2005
Posts: 201
alorent
THANKS!!!!
Post 17 Apr 2008, 13:16
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