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To: Julian Elischer <julian@elischer.org>
Cc: Marcel Moolenaar <marcel@xcllnt.net>,
	John Baldwin <jhb@FreeBSD.ORG>, current@FreeBSD.ORG
Subject: Re: Linuxulator: possible Giant pushdown victim
References: <20010905172451.A526@dhcp01.pn.xcllnt.net>
	<XFMail.010906115519.jhb@FreeBSD.org>
	<20010907003859.A446@dhcp01.pn.xcllnt.net>
	<3B987CBA.97FC1A94@elischer.org>
From: Dag-Erling Smorgrav <des@ofug.org>
Date: 10 Sep 2001 20:32:42 +0200
In-Reply-To: <3B987CBA.97FC1A94@elischer.org>
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Julian Elischer <julian@elischer.org> writes:
> Marcel Moolenaar wrote:
> > BTW: Do we have handy functions for use in the remote debugger, such
> > as show_proc, show_vm or whatever, that dump important information
> > in a readable form?
> Matt has a cool set of macros as does Grog.

I have a couple of macros I've used for debugging KLDs, which may
serve as templates or inspiration for someone to write e.g. a "ps"
macro (it shouldn't be too different from the "kldstat" macro, just
walk the process table and print formatted info for every process)

define kldstat
  set $kld = linker_files.tqh_first
  printf "Id Refs Address    Size     Name\n"
  while ($kld != 0)
    printf "%2d %4d 0x%08x %-8x %s\n", \
      $kld->id, $kld->refs, $kld->address, $kld->size, $kld->filename
    set $kld = $kld->link.tqe_next
  end
end

document kldstat
  Lists the modules that were loaded when the kernel crashed.
end

define kldstat-v
  set $kld = linker_files.tqh_first
  printf "Id Refs Address    Size     Name\n"
  while ($kld != 0)
    printf "%2d %4d 0x%08x %-8x %s\n", \
      $kld->id, $kld->refs, $kld->address, $kld->size, $kld->filename
    printf "        Contains modules:\n"
    printf "                Id Name\n"
    set $module = $kld->modules.tqh_first
    while ($module != 0)
      printf "                %2d %s\n", $module->id, $module->name
      set $module = $module->link.tqe_next
    end
    set $kld = $kld->link.tqe_next
  end
end

document kldstat-v
  Lists modules with full information.
end

define kldload
  set $kld = linker_files.tqh_first
  set $done = 0
  while ($kld != 0 && $done == 0)
    if ($kld->filename == $arg0)
      set $done = 1
    else
      set $kld = $kld->link.tqe_next
    end
  end
  if ($done == 1)
    shell /usr/bin/objdump -h $arg0 | \
      awk '/ .text/ { print "set \$offset = 0x" $6 }' > .kgdb.temp
    source .kgdb.temp
    add-symbol-file $arg0 $kld->address + $offset
  end
end

document kldload
  Loads a module. Arguments are module name and offset of text section.
end

DES
-- 
Dag-Erling Smorgrav - des@ofug.org

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