From owner-freebsd-arch@freebsd.org  Tue Mar 15 21:46:58 2016
Return-Path: <owner-freebsd-arch@freebsd.org>
Delivered-To: freebsd-arch@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id BA97AAD20E7;
 Tue, 15 Mar 2016 21:46:58 +0000 (UTC)
 (envelope-from mokhi64@gmail.com)
Received: from mail-lb0-x234.google.com (mail-lb0-x234.google.com
 [IPv6:2a00:1450:4010:c04::234])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 475CE645;
 Tue, 15 Mar 2016 21:46:58 +0000 (UTC)
 (envelope-from mokhi64@gmail.com)
Received: by mail-lb0-x234.google.com with SMTP id x1so35920592lbj.3;
 Tue, 15 Mar 2016 14:46:58 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:date:message-id:subject:from:to:cc;
 bh=/HP/5rDn3uvkcsajgozOrVapxOJcoUss+QlM4nxBR+M=;
 b=LR2qmWp3VGq0PRcirCaVO/apMo31NT2EW6rKC8m3k0tuDbZ5m6iNguCeZORUe0hkzC
 NyLP7DaAE5Uof36cZmMy4Xa7eAFBEQzpG6VoSuBiYL+XRSuHqbXEQrYaE5hQexpRO8H9
 W6tE7h/8TAdB8w0U6f/3SEsSpp4PXe0rJ9jPGw7mAouue3wRRe57u3bVxo6y/0KZ7fUp
 0Y3KNBJUrqZNgn9iiAN4tSn7BDPBSdQ9NF2NoX0WaaYRUjAPnccyyw6wR0DHtV03EcSc
 9TdLNVEhomcgLYyxA+ZMi1n0vsBLL39txI2NspWVizBy2I/vTx1RhdR3VxGHwCguMuSQ
 CXQg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
 d=1e100.net; s=20130820;
 h=x-gm-message-state:mime-version:date:message-id:subject:from:to:cc;
 bh=/HP/5rDn3uvkcsajgozOrVapxOJcoUss+QlM4nxBR+M=;
 b=W7T21eUDzeuejBlq1yInNzUCwBiAN7/V1n/C9BbckEb+wv4i0BOCpbgawv/cXmcVOM
 E26/6xCig9xFinQx4xnXC6fKr4ZkyvJMMxNCK+ZQpLiRRLOa1C+ZUX/4lF4ehGb91G3G
 c0YHaYjMX1CdZH/nPsDEFHr7xSnCOpiVHXpiGAVAF4EzNQ6jyro6MYdbS3tRbXYnkiL1
 tRxee03swR24MTK11dRNJGcIaHJofMBXr+d6n1tJQ+LovGaO8wNg7csZkaPz210U5KmS
 Sfj6/Snho+UHPwsikE5GEvLwXHo9uQ1H3I5yNb61NLZ65npBknsfonaqt2taKGY5tyzG
 59XA==
X-Gm-Message-State: AD7BkJKVx95xC2QCjlJxUpu1y/8LWHgzm0NTAXMzJcCOjkOYnkEvq5OhLDlX06pjnDkvUExa66eneMriKn7OVQ==
MIME-Version: 1.0
X-Received: by 10.112.77.138 with SMTP id s10mr92223lbw.125.1458078416306;
 Tue, 15 Mar 2016 14:46:56 -0700 (PDT)
Received: by 10.25.139.68 with HTTP; Tue, 15 Mar 2016 14:46:56 -0700 (PDT)
Date: Wed, 16 Mar 2016 01:16:56 +0330
Message-ID: <CAByVWPUY0TzYUdjXfWkkUAjYCPCC5irEkHj-ixhVUQsx7T-mrg@mail.gmail.com>
Subject: Hi, a question about "struct sysentvc"
From: mokhi <mokhi64@gmail.com>
To: freebsd-arch@freebsd.org
Cc: freebsd-emulation@freebsd.org
Content-Type: text/plain; charset=UTF-8
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-arch>,
 <mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch/>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
 <mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 15 Mar 2016 21:46:58 -0000

Hi guys.
I was reading/studying code of Elf image activator to see how binary
stars on FreeBSD.
On included file (sysent.h), I saw 3 declarations:
extern struct sysentvec aout_sysvec;
extern struct sysentvec elf_freebsd_sysvec;
extern struct sysentvec null_sysvec;

I looked at their definitions too (though i couldn't find
elf_freebsd_sysvec, where's it ?).
I have some (maybe simple, so sorry for it :D) questions.

1) what's sysentvec for, basically ? and in which concept it connects
to image-activators (such as ELF image activator [or a.out's])

2) is there any reference/guide to see how should/can we define a
"struct sysentvec" for new format ?

FWIW, I'm also a little familiar with NetBSD way of binary
running/compat layer devel.

Thanks and thousands of regards, Mokhi.