From:	kriiid AT my-deja DOT com
Newsgroups:	comp.os.msdos.djgpp
Subject:	allocating memory using DPMI
Date:	Sun, 17 Oct 1999 10:14:24 GMT
Organization:	Deja.com - Before you buy.
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

    Hello,
Well, the first question is: when I get SIGSEGV there is written
information about segments. What does limit section mean? I thought
this is size of segment. But now I don't think so, cause values like
0x8ffff are not really possible (if it is size in bytes, maybe it is in
pages...).

I've tried some prettey low-level programming using NASM & DJGPP. For
start - the most essential function - allocating memory (501h). So I
made program which just allocates some memory. I run it under windows.
So, linear address is 05DAC000h. And now the funny part. Base address
of DS/CS is 83046000h ;-). So now I've got a problem. But I thought
it's beacause windows is DPMI host (is it true?) and it doesn't now
that djgpp is using such a high segments. So I run it under DOS.
Allocated addres is 200B0000h, while base addres is 10000000h. It looks
OK, but when I try to write there I get a beautiful SIGSEGV. Of course
(?) I substract base address from allocated address when I write
there...

Do you have any idea what is the problem?

Maybe I should put some code?

     May the Force be with ya,
     Michal 'CreeD' Szostakiewicz
buttman AT boss DOT staszic DOT waw DOT pl ew. gerwek AT polbox DOT com
ICQ - 2482112
"Only in America we stamp our God
<<In God we Trust>>"


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