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Subject: Re: gdb/CYGWIN
To: Earnie Boyd <earnie_boyd AT yahoo DOT com>
Cc: cygwin AT sources DOT redhat DOT com
X-Mailer: Lotus Notes Release 5.0.3 (Intl) 21 March 2000
Message-ID: <OFDE694C5A.0C66993D-ON8525697B.0062419A@raleigh.ibm.com>
From: "Ed Bradford/Raleigh/IBM" <egb AT us DOT ibm DOT com>
Date: Tue, 17 Oct 2000 14:05:22 -0400
X-MIMETrack: Serialize by Router on D04NMS90/04/M/IBM(Release 5.0.3 (Intl)|21 March 2000) at
 10/17/2000 02:05:19 PM
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Strange stuff. I think it has to do with stdio.

     gdb -nw granular-gcc.exe
     break main
     run
(breaks at main)
     disassemble main
     0x40107c <main>:
     0x40107d <main+1>:
     ... (more addresses, no instructions)
     push %ebpmov %esp,%ebpsub $0x28,$espcall 0x401170 <__main>movl
$0s0,...

It prints a bunch of addresses, then it prints the assembly language.

Continuing, I hit stepi and it prints C language lines (compiled with -g).
It prints the lines multiple times
because there are probably multiple assembly language instructions on for
some C lines. It gets
to GetTickCount() and I stepi into it. Gdb -nw says
     0x401300 in GetTickCount AT 0 ()
Then I type
     disassemble GetTickCount
and it says
     No symbol "GetTickCount" in current context.

I don't know what is going on here.

Ed


PS. On the assembly language print out issue. there is another
manifestation of a stdio issue. The
DC program waits until I exit before it prints anything. Somehow, it thinks
it's writing to a buffered stream and does not
emit stuff to the bash or cmd.exe console screen until exit.



Your Windows 2000 Arborist
T/L 589-4410; Outside: 1-919-993-4410
egb AT us DOT ibm DOT com


Earnie Boyd <earnie_boyd AT yahoo DOT com> on 10/17/2000 01:44:45 PM

To:   Ed Bradford/Raleigh/IBM AT IBMUS, cygwin AT sources DOT redhat DOT com
cc:
Subject:  Re: gdb/CYGWIN



--- Ed Bradford/Raleigh/IBM <egb AT us DOT ibm DOT com> wrote:
> I recently tried to single step CYGWIN's GDB through a Microsoft DLL.
> Specifically, I wanted
> to see the assembly language instructions of GetTickCount() (which is
only
> 4 instructions long).
> When gdb got to the GetTickCount() call, it quit single stepping in
> assembly language and asked me
> to
>      Select function name to disassemble
>

What happens if you try it with `gdb -nw'?

Cheers,

=====
Earnie Boyd
mailto:earnie_boyd AT yahoo DOT com

---         <http://earniesystems.safeshopper.com>         ---
--- Cygwin: POSIX on Windows <http://gw32.freeyellow.com/> ---
---   Minimalist GNU for Windows <http://www.mingw.org/>   ---

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