Mail Archives: djgpp/1999/07/26/02:41:51

Date: Mon, 26 Jul 1999 09:39:26 +0300 (IDT)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender: eliz AT is
To: "Cesar S. Rabak" <csrabak AT ipt DOT br>
cc: djgpp AT delorie DOT com
Subject: Re: Bizarre debugging format problem
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On Sun, 25 Jul 1999, Cesar S. Rabak wrote:

> >> Exiting due to signal SIGINT
> >> Control-Break Pressed at eip=00010ce6
> >> eax=00000000 ebx=00000021 ecx=00000000 edx=0000000e esi=00000054
> >> edi=000643ac
> >> ebp=0006439c esp=00064390 program=D:\DEVELOP\TEST\DBGINFO\TESTIT
> >> cs: sel=00ef  base=83231000  limit=0007ffff
> >> ds: sel=00f7  base=83231000  limit=0007ffff
> >> es: sel=00ff  base=83231000  limit=0007ffff
> >> fs: sel=0117  base=00015bf0  limit=000028ff
> >> gs: sel=0107  base=00000000  limit=ffffffff
> >> ss: sel=00f7  base=83231000  limit=0007ffff
> >> 
> >> Call frame traceback EIPs:
> >>   0x00010ce6   ___dpmi_int+114
> >>   0x0000da99   _getch+49
> >>   0x00001de1   _main+29
> >>   0x0000d0aa   ___crt1_startup+138
> >
> >This seems to indicate that there's a real problem with line-number
> >info in this program: symify didn't print them as well.  Could you
> >please make this binary available for downloading, or send it to me?
> >I want to look into it some more.
> >
> >This traceback also shows that you still use v2.01 library.  Why?
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Will you pardon, but _how_ do we figure this in the traceback?

There are two telltale signs:

  - The limit of the segment whose selector is loaded into GS is -1.
    Since we are inside __dpmi_int, GS likely holds the _dos_ds
    selector (library functions that communicate with DOS/BIOS call a
    special variant of _farptr functions which use the GS register
    instead of FS).  _dos_ds had a limit of -1 in v2.01, whereas v2.02
    resets it back to 1MB+64KB.

  - The stack dump in v2.02 and later includes an additional line with
    stack limits, right below the registers' dump, like this:

  App stack: [00391054..00311054]  Exceptn stack: [0018b0e0..001891a0]

- Raw text -

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