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Date:	Mon, 20 Mar 2000 12:33:05 -0600 (CST)
From:	Mumit Khan <khan AT NanoTech DOT Wisc DOT EDU>
To:	Leonhard Grünschloß <gruenschloss AT hotmail DOT com>
cc:	cygwin AT sourceware DOT cygnus DOT com
Subject:	Re: integrated asm and vars
In-Reply-To:	<20000320122537.2645.qmail@hotmail.com>
Message-ID:	<Pine.HPP.3.96.1000320123100.18796B-100000@hp2.xraylith.wisc.edu>
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On Mon, 20 Mar 2000, Leonhard Grünschloß wrote:

> My problem: I want to use the integrated assembler for some time critical 
> procedures. But I need to get the content of some local vars - I couldn't 
> find a solution for about 4 hours. I tried to use VC++ style e.g. mov eax, 
> [asm_var] - didn't work. I wrote an extra procedure and used "%0", "%1" to 
> get the parameters - didn't work. I tried to use TASM and link the object - 
> cygwin couldn't read it. Finally used FreePascal (based on gcc) - produced 
> compilable asm code but it couldn't find the reference. Then I tried to get 
> the address by calculating it with the help of %ebp - always got access 
> violation errors. I'm new to asm so I don't know what this "=&a" (var) 
> means, to - well to assign a var to a register it also didn't work. Is it 
> only for results?

First read the GCC documentation on inline assembly, and then look at the
excellent tutorial by Colin Plumb (URL below), and that should give you a 
pretty good head start.

   Linkname: asm tutorial [Re: More assembly compiler erorrs]
   URL: http://sourceware.cygnus.com/ml/cygwin/1999-08/msg00138.html

Regards,
Mumit



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