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From: Les Cargill <lcargill AT worldnet DOT att DOT net>
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Subject: Re: Stack stuff...
References: <3FBC6527 DOT A66A8218 AT worldnet DOT att DOT net> <u4qwzvvrv DOT fsf AT elta DOT co DOT il>
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Date: Fri, 21 Nov 2003 02:32:08 GMT
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Eli Zaretskii wrote:
> 
> > From: Les Cargill <lcargill AT worldnet DOT att DOT net>
> > Newsgroups: comp.os.msdos.djgpp
> > Date: Thu, 20 Nov 2003 06:52:52 GMT
> >
> > How can I reassign SS and SP with "asm"
> > directives with the DJGPP toolset ( gcc,
> > essentially).
> 
> In C, the easiest way is to use the longjmp library function.
>
> Why do you need to use "asm"?

To give the stack pointer an initial value, so that each "thread"
can have its own stack. 

My question, better stated, should have been "what are the macros
in the assembler, as used by GCC, that identify the esp register".

The answer is "%esp", judging from a "gcc -S" output file . 
The thing works fine. I note that the arguments to asm are
reversed from the output assembly for the "mov" instruction. 


--
Les Cargill