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Date:	Fri, 29 Mar 2013 01:05:22 -0700 (PDT)
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Subject:	Re: Mmap() and modify_ldt() in DOS
From:	Khusraw <sahrian AT lavabit DOT com>
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On Thursday, March 28, 2013 11:37:06 PM UTC+2, Georg Potthast wrote:
> Am Donnerstag, 28. März 2013 12:45:38 UTC+1 schrieb Khusraw:
> 
> > On Sunday, March 10, 2013 9:52:34 AM UTC+2, Napoleon80386 wrote:
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> > 
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> > > Hello. In this topic https://groups.google.com/forum/#!topic/comp.os.msdos.djgpp/yjONXRu-eDw
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> > 
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> > > 
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> > > my friend asked you about some help for building Wine on DJGPP.
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> > 
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> > > 
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> > 
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> > > I am also trying to do this. I have already compiled very old version of Wine (when Bob Amstadt was project leader). It runs, but only can show greeting of command line and check whether executable is NE. If I try to run sample app, SIGSERV stops this with error "Illegal parameter in syscall". I guess that problem is mmap() and modify_ldt(), both are only stubs now. 
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> > > I am using EMX - it implements more nesessary POSIX API. In 1990s some users tried to port alpha Wine on OS/2 using EMX (you can look into /documentation/wine_os2). They wrote that it is nesessary to implement mmap() and ldt. I wrote to email in this file, but mail server said that this adress no more exists :(
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> > > DJGPP and EMX can live together - I am using bash and make from DJGPP. So, I want to ask you some help to implement these functions.
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> > You may also want to look on the source code of my mplayer DJGPP port, especially on the Windows DLL loading part.
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> Do you mean the "ELFDLL_LoadLibraryExA" in elfdll.c? The file includes wine header files but I see no mmap.
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> 
> 
> Georg

No, look on "ldt_keeper.c" from "loader" folder and on "mmap-djgpp.c" from "osdep" folder. A more correct implementation should use DPMI 1.0 function AX = 0504H (Allocate Linear Memory Block) instead of memalign, which allows loading of non-relocatable executables too, but not all DPMI hosts support it.

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