integrated asm and vars
Mumit Khan
khan@NanoTech.Wisc.EDU
Mon Mar 20 10:33:00 GMT 2000
On Mon, 20 Mar 2000, Leonhard Grünschloàwrote:
> 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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