From owner-freebsd-current@freebsd.org  Mon Aug 20 11:26:41 2018
Return-Path: <owner-freebsd-current@freebsd.org>
Delivered-To: freebsd-current@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id D523B108D1E8
 for <freebsd-current@mailman.ysv.freebsd.org>;
 Mon, 20 Aug 2018 11:26:41 +0000 (UTC)
 (envelope-from jbeich@freebsd.org)
Received: from freefall.freebsd.org (freefall.freebsd.org
 [IPv6:2610:1c1:1:6074::16:84])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client CN "freefall.freebsd.org",
 Issuer "Let's Encrypt Authority X3" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 9110388A8C;
 Mon, 20 Aug 2018 11:26:41 +0000 (UTC)
 (envelope-from jbeich@freebsd.org)
Received: by freefall.freebsd.org (Postfix, from userid 1354)
 id 8A03016140; Mon, 20 Aug 2018 11:26:41 +0000 (UTC)
From: Jan Beich <jbeich@FreeBSD.org>
To: blubee blubeeme <gurenchan@gmail.com>
Cc: FreeBSD current <freebsd-current@freebsd.org>
Subject: Re: What's this gregset_t gregs thing
References: <CALM2mEkSNjmj+FSCoVd5N+r2Z07pHxcpDv+EggffUWmkZeCN3Q@mail.gmail.com>
Date: Mon, 20 Aug 2018 13:26:37 +0200
In-Reply-To: <CALM2mEkSNjmj+FSCoVd5N+r2Z07pHxcpDv+EggffUWmkZeCN3Q@mail.gmail.com>
 (blubee blubeeme's message of "Mon, 20 Aug 2018 08:33:04 +0800")
Message-ID: <sh39-xor6-wny@FreeBSD.org>
MIME-Version: 1.0
Content-Type: text/plain
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.27
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
 <freebsd-current.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current/>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
 <mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 20 Aug 2018 11:26:42 -0000

blubee blubeeme <gurenchan@gmail.com> writes:

> Linux has gregset_t gregs;
> https://github.com/lattera/glibc/blob/master/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
>
> Defined above, I also see it in the RISC-V glibc stuff as well.
>
> FreeBSD doesn't seem to have this field defined, I see FreeBSD uses
> /usr/include/x86/ucontext.h
>
> but there's no gregs;

__gregs exists on FreeBSD arm*, inherited from NetBSD.

> If I wanted to return mcontext.gregs
>
> How could I implement that on FreeBSD?

Only as gregset_t? If not return registers individually e.g.,
https://searchfox.org/mozilla-central/rev/83562422ecb0f5683da7a9a26ce05ce62bc0c882/js/src/wasm/WasmSignalHandlers.cpp#244