X-Authentication-Warning: delorie.com: mail set sender to djgpp-bounces using -f
X-Recipient: djgpp AT delorie DOT com
X-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20210112;
        h=cc:to:subject:message-id:date:from:references:in-reply-to
         :mime-version:from:to:cc:subject:date:message-id:reply-to;
        bh=sK65cJM9D1+/fZZtOjRsuCGxjuLMiLjeOMEhT+5Ysbg=;
        b=lluHglOPT2SQQpA7/MUnhJfBpoEy7evkUOHdMT7myT6gsOUCsdGAtKiuzUznsbTCO/
         dEFvh8ukeXIqUqasyXFAaBJ/Wungz7JHTEbV2eQkNfzbCxQ1WZUUposbzZzdsviA0oQV
         HQ/+Dwl9xXSTMgeouOmCd4Und39dHuWNUKvZCHci5MunVs9qc2fQJMjCW1PQcpj4IvgW
         dJWlMQ9oyWLfcy8y5Vz5N4vkahcEbeOacIhom9DnzRq4YMagJMAH1Myu6J4YzarfVhlj
         c1WGFIfiy8XNYM+5inO1eJ/RCjpFf/cDrRn4H/BjMgNp58iCYBqmaq8vTxVP2+kCS7fc
         7n8w==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20210112;
        h=cc:to:subject:message-id:date:from:references:in-reply-to
         :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id
         :reply-to;
        bh=sK65cJM9D1+/fZZtOjRsuCGxjuLMiLjeOMEhT+5Ysbg=;
        b=7f8BWKAsUcyWgOWZhH1dyJTtsLXFQ3ZdN2M+OGs453jft744amADVhLStaedb0iRT6
         lVxUsOFmtRKMjln9Q8a7NQRKT0iachHf91I5wXFXQo69lT+SN67Mu0oJcnP8p3xmfUtF
         1XyFadg4mAhFimiJGiIix401Kw8Kc/2+YWqJdxKPlSXj9kxTmdCK42i6PEp4U7LqpHsU
         ntbYi1UjvdpzPSTg/n6XoRv+VTkJtzhqsdNXOCzat802Mnr61p/zwQv9rSi+ot9inxmC
         Zgfl8lY8Uj4oTa5sU3dwKDnME5HKxOjhrji+pwKWZIVYkwoIsp74Sldg0yKejFPuQP/E
         Dq/g==
X-Gm-Message-State: AO0yUKUjOY3s83gVrLPHaS8b9MrR6gLZGkmFFoC8nUIHxecGkdjr3FHI
	QzRlndEjbOIOIQkW2gQHP9GUGUqTfQ7eKSior3gHikjS
X-Google-Smtp-Source: AK7set/0nM9uavomYQHEmVHdU/gxJu3ockisx+b5zu5v7UUcejbq1588yTIwUEXd23SuIVG/V0fwFzLDeYCLvg/u4wM=
X-Received: by 2002:a05:600c:a4e:b0:3e2:6f0:2543 with SMTP id
 c14-20020a05600c0a4e00b003e206f02543mr141258wmq.55.1676550334940; Thu, 16 Feb
 2023 04:25:34 -0800 (PST)
MIME-Version: 1.0
In-Reply-To: <CAA2C=vASQ0KY_jA05tUWpRHTocGtDKgn=KAU00JOezmbRu827Q@mail.gmail.com>
References: <CAA2C=vDf3MRSeBV_30REYLgJRUM_3uOzrej+_tN0HXXTZAXvvg AT mail DOT gmail DOT com>
 <CAA2C=vASQ0KY_jA05tUWpRHTocGtDKgn=KAU00JOezmbRu827Q AT mail DOT gmail DOT com>
From: "Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date: Thu, 16 Feb 2023 15:25:34 +0300
Message-ID: <CAA2C=vA8tH7vJ24kaNk3x8txvROon_K8UEdMJh_9b78utm1SAw@mail.gmail.com>
Subject: Re: dxe: page fault when derefencing an exported pointer variable
To: djgpp AT delorie DOT com
Cc: Daniel Borca <dborca AT yahoo DOT com>
Content-Type: text/plain; charset="UTF-8"
Reply-To: djgpp AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: djgpp AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

>> The 'normal' vars don't seem to have a problem, but dereferencing
>> that particular pointer results in a page fault:

Well, I was very very wrong:

I added some debug printf() statements to a simple program, so that
it prints the values of certain variables exported by the library :

UBYTE md_volume      : 233 (0xe9) --- should have been 128
UBYTE md_musicvolume : 233 (0xe9) --- should have been 128
UBYTE md_sndfxvolume : 233 (0xe9) --- should have been 128
UBYTE md_reverb      : 233 (0xe9) --- should have been 0
UBYTE md_pansep      : 233 (0xe9) --- should have been 128
UWORD md_mixfreq     : 44100
UWORD md_mode        : 63977 (0xf9e9) --- should have been 0x110F
UWORD md_device      : 9705  (0x25e9) --- should have been ???
MDRIVER* md_driver   : 0xcea27e9
CHAR* md_driver->Name: [crash...]

Note that all of those values have 0xe9 - except for md_mixfreq to
which I do assign 44100.  0xe9 (i.e.: jmp) seems to be coming from
dlstatbind():
https://www.delorie.com/bin/cvsweb.cgi/djgpp/src/libc/dxe/dxe3stat.c?rev=1.1

Looks like exported variables support in import libraries is very
much broken?