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From: Rod Pemberton <NeedNotReplyHere AT xrsevnneqk DOT cem>
Newsgroups: comp.os.msdos.programmer,comp.os.msdos.djgpp
Subject: Re: linker error segment_text exceeds 64k  in c
Date: Fri, 23 Jun 2017 20:49:18 -0400
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On Fri, 23 Jun 2017 17:56:56 +0000 (UTC)
rridge AT csclub DOT uwaterloo DOT ca (Ross Ridge) wrote:

> JJ  <jj4public AT vfemail DOT net> wrote:

(Added, comp.os.msdos.djgpp. in case someone wants to criticize.)

> >Does that mean that DJGPP's C/C++ compiler only have one large
> >memory model?  
> 
> DJGPP has only the 32-bit "flat" memory model.  It's like the tiny
> memory model except the size of its one segment is 4 gigabytes instead
> of 64 kilobytes.
> 

Actually, by default, DJGPP segments are limited to 640KB (0x0009FFFF)
in size for CS, DS, ES and SS, but not FS and GS.  So, you must call
__djgpp_nearptr_enable() to enable 4GB segments.  That will boost the
limit of those four segments to 0xFFFFFFFF.  FS will still be limited
to 64KB and GS will still be limited to 1MB+64KB.  The base for the
four main segments is 1MB, not zero.  GS' base is zero.  FS' base
varies, usually around 0x7C00.  This is true for all 3 compatible DPMI
hosts: CWSDPMI, CWSDPR0, and PMODEDJ.  You can change the base and
privileges of the selectors using other calls.

CS (code segment) is used by _my_cs() and _go32_my_cs().  DS (data
segment) is used by _my_ds() and _go32_my_ds().  SS (stack segment) is
used for _my_ss() and _go32_my_ss().  ES (extra segment) is used for
the PSP selector.  GS is used for __djgpp_dos_sel, _dos_ds,
_go32_info_block.selector_for_linear_memory,
_go32_conventional_mem_selector().  GS is used by libc for the segment
1MB+64KB, e.g., for real-mode DOS or BIOS or VGA routines.
__djgpp_ds_alias mirrors DS' settings and is used for RMCB's.  FS is
used for far pointers (farpeek, farpoke).


Rod Pemberton

-- 
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