Disassembler, debugger, etc...

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THEWizardGenius

Joined: 14 Jan 2005
Posts: 382
Location: California, USA

THEWizardGenius 22 Feb 2005, 23:11

I think it would be cool if someone made a debugger and/or disassembler designed to use FASM "syntax" or whatever you want to call it... at the very least a debugger that uses FASM syntax, and a disassembler Twisted Evil

would be nice too... obviously, it would strip EXE headers or include them as "DB" at the beginning of the file, same with other file formats (if it could detect them)
this is another one of those things that is beyond my area of "expertise" Laughing

so if someone could (or already has? if so, tell me...) make one or both of these things, or tell me how to get them, that would be great. Imagine a disassembler for FASM:

DISASSEMBLE something.com something.asm

Code:

;SOMETHING.COM
format binary
org 0100h

start:
mov ax,0004h   <-Can be configured to output in decimal, or binary, or octal,
;as well as hex- for example, "mov ax,0000000000000100b" instead of
;mov ax,0004h - maybe even automatically strip zeroes out...
.label1.1:
  int 5h
  jnz far start     <-far jump, so no local label
  loop .label1.1 <-short loop, so label is local

this, of course, is nonsense jibberish useless code, but you get the idea...
It doesn't necessarily have to be written in FASM, of course (but why write it in anything else?) just so long as it works... that would be cool...

_________________
FASM Rules!
OS Dev is fun!
Pepsi tastes nasty!
Some ants toot!
It's over!

Last edited by THEWizardGenius on 24 Feb 2005, 17:22; edited 1 time in total

22 Feb 2005, 23:11

r22

Joined: 27 Dec 2004
Posts: 805

r22 23 Feb 2005, 04:51

That would be very convenient. A lot of the good disassemblers like IDApro make you buy them.

23 Feb 2005, 04:51

mike.dld

Joined: 03 Oct 2003
Posts: 235
Location: Belarus, Minsk

mike.dld 23 Feb 2005, 06:34

Some time ago I was writing disassembler plug-in for FAR (in FASM, for 16-bit code only) but haven't finished it and it may not be useful... Maybe later, who knows... It's definitely a good idea especially because I've accustomed to FASM syntax and everything else is just confusing me.

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http://ostin.googlecode.com/

23 Feb 2005, 06:34

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 23 Feb 2005, 12:58

http://www.themel.com/ida.html

23 Feb 2005, 12:58

iklin

Joined: 20 Mar 2004
Posts: 120
Location: Russia, Siberia

iklin 23 Feb 2005, 17:57

Hex-viewer/disassembler I know -
HIEW - http://webhost.kemtel.ru/~sen/
It's shareware.

Hex-viewer/diassembler which understand 64-bit code -
BIEW - http://biew.sourceforge.net/
It's freeware.

There are no fasm syntax but this is not so important.
I use this utils every day.

23 Feb 2005, 17:57

Juras

Joined: 18 Jun 2003
Posts: 23
Location: Belarus

Juras 23 Feb 2005, 21:08

ndisasm utility accompanying nasm is very good and almost the same as FASM's syntax.

for nice debugging FASM must include DEBUG information into the final EXE, like symbol names and their addresses and line numbers and source file names.

23 Feb 2005, 21:08

Tommy

Joined: 17 Jun 2003
Posts: 489
Location: Norway

Tommy 23 Feb 2005, 21:41

Quote:

for nice debugging FASM must include DEBUG information into the final EXE, like symbol names and their addresses and line numbers and source file names.

Will you implement this, Privalov?

23 Feb 2005, 21:41

ronware

Joined: 08 Jan 2004
Posts: 179
Location: Israel

ronware 23 Feb 2005, 23:21

Tommy wrote:

Quote:
for nice debugging FASM must include DEBUG information into the final EXE, like symbol names and their addresses and line numbers and source file names.
Will you implement this, Privalov?

Please....?

23 Feb 2005, 23:21

THEWizardGenius

Joined: 14 Jan 2005
Posts: 382
Location: California, USA

THEWizardGenius 24 Feb 2005, 17:21

Remember, one of the main principles upon which FASM is based is that it assembles ONLY what is in the code- it will not append anything else, except of course EXE headers, etc. However, perhaps a directive, such as "incdebug" or something like that, used in the source... But I really only need a simple disassembler and/or debugger that maybe makes up line labels based on their position in source or by their context (for example, if the position is JMP'd to by a short JMP that is near by, the label would be output to the ASM file as a local label; if no nearby JMP's are used, or if all JMP's referencing that position are FAR, then it would not be local). This might be pretty complex. I suppose FASM syntax isn't the MOST important thing, but it is pretty high on my list... this is exactly what I mean:

Quote:

It's definitely a good idea especially because I've accustomed to FASM syntax and everything else is just confusing me.

_________________
FASM Rules!
OS Dev is fun!
Pepsi tastes nasty!
Some ants toot!
It's over!

24 Feb 2005, 17:21

f0dder

Joined: 19 Feb 2004
Posts: 3175
Location: Denmark

f0dder 24 Feb 2005, 17:23

Well, you could always assemble to coff format and use a linker that generates debug info? Smile

24 Feb 2005, 17:23

THEWizardGenius

Joined: 14 Jan 2005
Posts: 382
Location: California, USA

THEWizardGenius 24 Feb 2005, 21:33

I don't use Object files, ever, I prefer to use plain binary or if I have to, EXE. But I understand what you mean. Besides, that would be a two-step solution, and why use a two-step solution if you can use a one-step solution Question

_________________
FASM Rules!
OS Dev is fun!
Pepsi tastes nasty!
Some ants toot!
It's over!

24 Feb 2005, 21:33

iklin

Joined: 20 Mar 2004
Posts: 120
Location: Russia, Siberia

iklin 25 Feb 2005, 15:16

THEWizardGenius wrote:

I suppose FASM syntax isn't the MOST important thing, but it is pretty high on my list...

Well... Why you can't write your own disasm with fasm syntax? Smile

It's not so simple but not so hard. Some times ago I think about it but I have not enough time. Sad

25 Feb 2005, 15:16

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