Re: [Freedos-kernel] Borland C 386 bug
On Thu, 12 Feb 2004 13:34:33 +0300 (MSK), Arkady V.Belousov wrote: Unfortunately, I don't know, how to turn return target processor option back - target may be 386, but it may be also 8086. Probably, next (after fmemcpy() definition) should work: #ifdef __BORLANDC__ # pragma option -3. #endif Yes, it does work, but this is even worse than my workaround. Lucho --- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356alloc_id=3438op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
[Freedos-kernel] Borland C 386 bug
Salve, As I again don't receive messages from the kernel mailing list, I again had to wade through the web interface to find the critics below, and suddently SF said it's in read-only mode, so I guess it's in big trouble now :-( I'm sorry but I think that's a hack^2. Since you have absolutely no guarantee that Borland C won't use EAX anywhere else and not in the future either. There really should be push/pop wrapper somewhere instead, using the Protect386Registers and Restore386Registers asm macros defined in hdr\stacks.inc The question is now, where does eax get destroyed? Did you double check if entry.asm includes them for your configuration (%ifdef I386). Or perhaps all that is needed is that the high parts need to be cleared after calling a device driver or somewhere else? I didn't check because I don't know what to check. Browsed entry.asm and understood nothing. Do apply your ideas and I'll be serving as a live compiler, as I'm obviously only good for that. My god - what a sad story. boot a kernel that works. load device=softice. insert floppy with bad kernel. SIceboot SIce still is in memory, and will popup at the faulting instruction, or you can insert some int(3) to trace the offending code. Sorry, Tom - as you know, I've never been a professional programmer, only an amateur here... Actually, I'm an electronics engineer and never studied programming or computer science ;-) don't like it that way. EAX register may be used next week by a different function, or Arkady optimizes the memcpy() functions, and the error pops up again. I'd propose to add/fix some Borland RTL library to handle this issue. probably not too much work, as the only used functions are xxxMUL32/xxxDIV32 and they are fairly short. Is it the RTL or the compiler itself?! How dares Datalight use it for their ROM-DOS, written just like FreeDOS in 95% C, 5% assembler?! Sorry, guys - FECI QUOD POTUI, FACIANT MELIORA POTENTES! Lucho --- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
Re: [Freedos-kernel] Borland C 386 bug
On Wed, 11 Feb 2004, Luchezar Georgiev wrote: INIT_FMEMCPY: |INIT_FMEMCPY: enter 8,0|pushBP mov DX,4[BP] |mov BP,SP mov EAX,0Ah[BP]|mov DX,4[BP] mov -4[BP],EAX |jmp short L76 mov EAX,6[BP] |L64:les BX,6[BP] mov -8[BP],EAX |mov AL,ES:[BX] jmp short L92|les BX,0Ah[BP] L80:les BX,-8[BP] |mov ES:[BX],AL mov AL,ES:[BX] |inc word ptr 6[BP] les BX,-4[BP] |inc word ptr 0Ah[BP] mov ES:[BX],AL |L76:mov AX,DX inc word ptr -8[BP]|dec DX inc word ptr -4[BP]|or AX,AX L92:mov AX,DX |jne L64 dec DX |pop BP or AX,AX |ret 0Ah jne L80| leave | ret 0Ah| Well I see no bug in this fmemcpy. One other thing I can imagine being a problem is that some device drivers or programs you use rely on the high word of eax being zero. since you said: after the install commands are processed (if any). This means that if no install was present no problems occurred? so what you could try is to add a xor eax, eax at a strategic place, ie. _exec_user: xor eax, eax in procsupt.asm. Also execrh.asm for device drivers. Hmm, reminds of some bug in bugzilla ... Bart --- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356alloc_id=3438op=click ___ Freedos-kernel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/freedos-kernel
