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From:	ld AT jasmine DOT netrix DOT com (Long Doan)
Subject:	Re: Assembly, second time
Lines:	32
Sender:	news AT netrix DOT com
Organization:	Netrix Corporation
References:	<DD563t DOT 14H AT jade DOT mv DOT net>
Date:	Mon, 14 Aug 1995 12:43:41 GMT
To:	djgpp AT sun DOT soe DOT clarkson DOT edu
Dj-Gateway:	from newsgroup comp.os.msdos.djgpp

In article <DD563t DOT 14H AT jade DOT mv DOT net> sulyokp AT dragon DOT klte DOT hu (Sulyok Peter) writes:

> I haven't got any response to these question, so I write these again.
> 
> I need more information about C & assembly interface in DJGPP.

  You should read the FAQ and gas's docs on this one.

> I see in library source code that you save ESI, EDI and EBX
> registers in assembly modules.
> Is it enough to write a safe assembly routine ?

  That should be enough, but to be sure, you can either:
   - Save all registers that you use.
   - Tell gcc that you'll clobber those registers.

> What are the default processor registers of C register variables in DJGPP ?
> And what about '-mreg-alloc=REG' option of GCC ?

  GCC'll decides which registers it can use to store some
variables. Generally, the registers %eax, %ebx, %ecx, %edx, %esi, and %edi
will be used.

Long.

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