Date:	Mon, 26 Feb 1996 13:21:41 -0500
From:	dj (DJ Delorie)
Message-Id:	<199602261821.NAA16654@delorie.com>
To:	oandico AT eee DOT upd DOT edu DOT ph
CC:	djgpp AT delorie DOT com
In-reply-to:	<Pine.SOL.3.91.960226135501.2185B-100000@gollum> (message from Orlando Andico on Mon, 26 Feb 1996 13:55:52 -0800 (GMT))
Subject:	Re: DOSemu

>   Since DOSemu has a DPMI mode, is it possible to run DJGPP under Linux? 
> has anyone tried this?

I've done lots of djgpp development in dosemu.  You need this patch:

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From: Michael Leodolter <michael AT lab1 DOT psy DOT univie DOT ac DOT at>
Newsgroups: comp.os.linux.announce
Subject: DPMI Patch against plain 0.60.4
Followup-To: comp.os.linux.development.system
Date: Mon, 11 Dec 95 23:25:03 GMT
Organization: Vienna University, Austria
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Approved: linux-announce AT news DOT ornl DOT gov (Lars Wirzenius)
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-----BEGIN PGP SIGNED MESSAGE-----


Hi all DOSEMU-Users/Developers,
with the following patch it is possible to run PM make/compiler
compinations.
I tried it with DJ200 make on a dir with 15 obj-files, and it works fine.

- ----- cut here -----
*** dpmi/dpmi.c.orig	Sat Nov  4 18:46:44 1995
- --- dpmi/dpmi.c	Wed Dec  6 11:33:33 1995
***************
*** 190,195 ****
- --- 190,205 ----
  #define vm86_regs sigcontext
  #endif
  unsigned long RealModeContext;
+ /*
+  * With this stack nested PM programs like DJ200's make/compiler work fine
+  * (maybe Borkland's protected mode make/compiler too).
+  * For do_int31
+  * 	0x0300:	Simulate Real Mode Interrupt
+  * 	0x0301:	Call Real Mode Procedure With Far Return Frame
+  * 	0x0302:	Call Real Mode Procedure With Iret Frame
+  */
+ unsigned long RealModeContext_Stack[DPMI_max_rec_rm_func];
+ unsigned long RealModeContext_Running = 0;
  
  static INTDESC Interrupt_Table[0x100];
  static INTDESC Exception_Table[0x20];
***************
*** 982,987 ****
- --- 992,1013 ----
    /*2ch*/	*++lp = 0xffffffff;
  }
  
+ static inline void save_rm_context()
+ {
+   if (RealModeContext_Running >= DPMI_max_rec_rm_func) {
+     error("DPMI: RealModeContext_Running = 0x%4x\n",RealModeContext_Running++);
+     return;
+   }
+   RealModeContext_Stack[RealModeContext_Running++] = RealModeContext;
+ }
+ 
+ static inline void restore_rm_context()
+ {
+   if (RealModeContext_Running-- > DPMI_max_rec_rm_func)
+     return;
+   RealModeContext = RealModeContext_Stack[RealModeContext_Running];
+ }
+ 
  static inline void save_rm_regs()
  {
    if (DPMI_rm_procedure_running >= DPMI_max_rec_rm_func) {
***************
*** 1231,1236 ****
- --- 1257,1263 ----
    case 0x0301:	/* Call Real Mode Procedure With Far Return Frame */
    case 0x0302:	/* Call Real Mode Procedure With Iret Frame */
      save_rm_regs();
+     save_rm_context();
      RealModeContext = GetSegmentBaseAddress(_es) + (DPMIclient_is_32 ? _edi : _LWORD(edi));
      {
        struct RealModeCallStructure *rmreg = (struct RealModeCallStructure *) RealModeContext;
***************
*** 2088,2094 ****
    my_sp = LWORD(esp);
    NOCARRY;
  
!   save_rm_regs();
  
    REG(cs) = DPMI_SEG;
    REG(eip) = DPMI_OFF + HLT_OFF(DPMI_return_from_dos);
- --- 2115,2123 ----
    my_sp = LWORD(esp);
    NOCARRY;
  
!   if(!in_dpmi) { /* Don't eat rm regs if already in dpmi */
!     save_rm_regs();
!   }
  
    REG(cs) = DPMI_SEG;
    REG(eip) = DPMI_OFF + HLT_OFF(DPMI_return_from_dos);
***************
*** 2944,2949 ****
- --- 2973,2979 ----
  
    } else if (lina == (unsigned char *) (DPMI_ADD + HLT_OFF(DPMI_return_from_realmode))) {
      struct RealModeCallStructure *rmreg = (struct RealModeCallStructure *) RealModeContext;
+     restore_rm_context();
  
      D_printf("DPMI: Return from Real Mode Procedure\n");
  #ifdef SHOWREGS

- ----- cut here -----
- -------------------------------------------------------
- -  Michael Leodolter         Brain Research Lab (BRL)  -
- -  Inst. of Psychologie               Univ. of Vienna  -
- -  EMail:       <Michael DOT Leodolter AT univie DOT ac DOT at>       -
- -  or       <Michael DOT Leodolter AT lab1 DOT psy DOT univie DOT ac DOT at>  -
- -  Tel: <+43-222-40103-2436> Fax: <+43-222-406 64 22>  -	
- -------------------------------------------------------- 


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