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From: eplmst AT lu DOT erisoft DOT se (Martin Stromberg)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: DS and ESP
Date: 22 Feb 2002 13:46:06 GMT
Organization: Ericsson Erisoft AB, Sweden
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References: <a4rfgu$sbg$1 AT news DOT tpi DOT pl> <968-Mon18Feb2002212153+0200-eliz AT is DOT elta DOT co DOT il> <a55f0s$dom$1 AT news DOT tpi DOT pl>
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MarKol (markol4 AT wp DOT pl) wrote:
: : Użytkownik "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> napisał w wiadomości
: : DS may become invalid if a signal happens, like if you press Ctrl-C
: : or run with timers.  The library provides a special alias selector,
: : __djgpp_ds_alias, which is always valid and spans the same memory
: : region as the selector normally loaded into DS.

: Yes, but how do I load this __djgpp_ds_alias selector when my ds
: is invalid??

You use CS which is valid:

mov	ax, cs:__djgpp_ds_alias


: But I think this will work
: and I'm able to load proper ds segment in my wrapper routine.
: I can put something like this in my wrapper:

: .
: .
: .
: mov  ax, 0
: mov  ds, ax

If this is in protected mode, you have an exception the moment you
access any data. 


Right,

						MartinS