From: Pedro Alves <pedro@palves.net>
To: Simon Sobisch <simonsobisch@gnu.org>,
Simon Sobisch via Gdb <gdb@sourceware.org>
Subject: Re: Is corefile support for missing on Win32?
Date: Thu, 9 Jun 2022 17:20:44 +0100 [thread overview]
Message-ID: <87eba601-e753-02ac-0645-45c09377cac6@palves.net> (raw)
In-Reply-To: <e73f4662-7614-c05a-77dd-bd65ac858cb5@gnu.org>
On 2022-06-07 20:30, Simon Sobisch via Gdb wrote:
> Testing with MSYS2 generated mingw64 gcc 12.1 + gdb 12.1 resulted in "everything working" ...until I needed to create a core file.
>
> (gdb) show arch
> The target architecture is set to "auto" (currently "i386:x86-64").
> (gdb) gcore test.core
> warning: cannot close "test.core": invalid operation
> Can't create a corefile
>
> (with gnutarget auto, pei-x86-64 and pe-x86-64)
>
> I see that the first error message comes from
> gdb/gdb_bfd.c (gdb_bfd_close_warning)
> and the second from the default implementation
> gdb/exec.c (make_corefile_notes)
>
>
> This issue seems to exists for longer as some SO question [1] asked about this over 5 years ago.
>
> Further testing showed the same issue with same tools in MinGW x86 and with "good old MinGW" using GDB 7.6.1 / GCC 9.2.
>
> Testing with cygwin-x64 (GDB 11.2) shows the same result.
>
Native Windows GDB was never able to generate cores. Basically because cores are ELF objects,
while Windows is PE, so it's kind of a foreign thing.
However, Cygwin comes with a separate utility that is able to dump cores in ELF format, and
Windows GDB is actually able to read those. This utility is called "dumper". See here:
https://www.cygwin.com/cygwin-ug-net/dumper.html
Sources are here:
https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=winsup/utils/dumper.cc
If someone wanted to work on it, I don't see any obstacle to GDB's gcore command
itself generating an ELF core in the exact same format.
> I guess the system's minidump format cannot be processed with GDB, can it?
Unfortunately not. Christian Biesinger did write a patch to add support for it while ago, though:
https://sourceware.org/git/?p=binutils-gdb.git;a=shortlog;h=refs/heads/users/cbiesinger/minidump
AFAIK, this was never finished/contributed for proper inclusion, and I don't know how far
that is to being complete.
next prev parent reply other threads:[~2022-06-09 16:20 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-07 19:30 Simon Sobisch
2022-06-09 16:20 ` Pedro Alves [this message]
2023-02-07 10:35 ` Simon Sobisch
2023-02-07 20:18 ` Christian Biesinger
2023-02-08 16:28 ` Hannes Domani
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