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From:	pirkola AT nmpou DOT nmp DOT nokia DOT com (Rauno Pirkola)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: [Q] Making DJGPP use SEL:OFF
Date:	24 Jul 1995 11:04:18 GMT
Organization:	Nokia Mobile Phones / Oulu, Finland
Lines:	38
Sender:	pirkola AT nmpou DOT nmp DOT nokia DOT com ()
Distribution:	world
References:	<805952331 DOT 111snx AT techm DOT pl DOT my>
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To:	djgpp AT sun DOT soe DOT clarkson DOT edu
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In article <805952331 DOT 111snx AT techm DOT pl DOT my>, kenfoo AT techm DOT pl DOT my (Kenneth Foo) writes:
>Hi...can anyone point out to me how I can make DJGPP 2
>use a SELECTOR:OFFSET combination to address a memory space instead
>of using internal pointers (which uses a fixed DS as the selector) ?
>
>Thanks!
>
I don't use djgpp2 (yet) but you should check file include/sys/farptr.h.

I think GAS doesn't support ES:, FS: etc, but you can add 'data' within
the code (was done in the file above)

Syntax is like this:

asm( ...
    "    .byte $0x64        \n"     /* 0x64 == FS:   :) */
    "    movw  (%%edi),%%ax \n"
     ...


Prefixes index (not tested, but should be correct)

CS: 0x6e
DS: 0x7e
ES: 0x26
FS: 0x64
GS: 0x65
SS: 0x36



PS. I found these out yesterday!


Hope this helps!

- Rane

- Raw text -