From nobody Thu Oct 29 01:35:00 2026 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4jFRcP3lmtz6xX73 for ; Thu, 29 Oct 2026 01:35:01 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 4jFRcN5bzGz4DV6 for ; Thu, 29 Oct 2026 01:35:00 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793237700; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Ah7xLRISq3ITt87DRFPH7qvD0io1PZNsSszSizdF+2Y=; b=L3it+WCQjPnNGn2tfKErqntv42AoGgBd90aeYMUu6Fx/DMJ9XRv8Tjon289Jzjey6648lX S38j5ObXElug85ZczCq41FuTbUKAfbt/43E5NTP+MNPI/XKjlUq3hXfTzj/SMsScCWQ6zr mhktNnmgrRjFsj5GQH/Qft9oBzwad/2GrQMfeCfRqvlXiuRktm+Oo/xm3AzTJPZJFuz8gK k1V13OjqpHoWocGMjtuF83U10ZDsRXffS02998JsRDruSlDFhvMfjVqrQ0RnAvJAtw6TDM cTDY9bWEiJW4h/4jq2uP/bwNRlRmS4DIxyQgfEZktTkMsPhGZH0khr2fcH+tTA== ARC-Seal: i=1; a=rsa-sha256; d=freebsd.org; s=dkim; cv=none; t=1793237700; b=eHfF0oWXmT5amyWo+9yZoEmvy7+tnhLaO779ullai3U6kW9EadK+b96IEvvZv70DRAarzz 5qgdUNiFnyLzlw4roH+CNdLejnW00/zF6OhulxBgZGNJrRYbQ4hh6xCzaFNEAQ0LJ9PGXu 4SG6HLxnrC37VTLFR17cd1r1Htp+6ViU/EdWLh30G3NyTeUDy+1HYxyZ//EEjh0mNh0DvR KmnvHHASi9IW7wog4/iQgR+w9cgWbW8R9I1FMPoyXCGZg27w1Ye245Ui4wM+1KHWEhlOXa pHG65jrWHFzieLJcyykIVILdFoVdlb+SrRepcXTfmsYh3CLS3cV8kevq+xjCqA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793237700; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=Ah7xLRISq3ITt87DRFPH7qvD0io1PZNsSszSizdF+2Y=; b=E668muAiZw+k2T7l3oCaN4wdj482UW6ot+MvdXhBu2RiSOaHEDyhnYvjuRerppN6EFaI26 4yIrraJ5dpW4wisfhtwEhUcw13tDMLlDwma17F+kBpNtZ/ARJQJBjHReLInPHAwFT6DUxw X8jw8mSu9NTPbH9HGAx5M/LN01OkF/6/i326BAQ+NbYU0nfZUtjmSg2LO9pSJf18CIxSB+ 1xwiav3IFEiPCqTmQ8yJ81mUenA3gBZLlz6IYXFb9oyi8g1nwHJlD9norjff/UUz04/Smz +ONVVhe9jG545bqgDRkXe8ofMxad8E8nmlTnW86CjmGWhU0j6rJs+UtCGdWT2g== ARC-Authentication-Results: i=1; mx1.freebsd.org; none Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4jFRcN4bk0zHrT for ; Thu, 29 Oct 2026 01:35:00 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 439fc by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Thu, 29 Oct 2026 01:35:00 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 837bb27c93a5 - main - amd64 FRED: clear %dr6 on #DB from kernel List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org List-Id: Commit messages for all branches of the src repository List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 837bb27c93a58a2df2f5203393ffa245b93caf31 Auto-Submitted: auto-generated Date: Thu, 29 Oct 2026 01:35:00 +0000 Message-Id: <6ae2a2c4.439fc.4f3b2403@gitrepo.freebsd.org> The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=837bb27c93a58a2df2f5203393ffa245b93caf31 commit 837bb27c93a58a2df2f5203393ffa245b93caf31 Author: Konstantin Belousov AuthorDate: 2026-10-29 00:57:52 +0000 Commit: Konstantin Belousov CommitDate: 2026-10-29 01:33:47 +0000 amd64 FRED: clear %dr6 on #DB from kernel Sponsored by: The FreeBSD Foundation MFC after: 1 week --- sys/amd64/amd64/trap.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c index 480728e9749f..d59b689c56b6 100644 --- a/sys/amd64/amd64/trap.c +++ b/sys/amd64/amd64/trap.c @@ -1785,6 +1785,14 @@ trap_fred_handle_k_exc(struct thread *td, struct trapframe_fred *frame, case IDT_DE: break; case IDT_DB: + /* + * Clear %dr6 when #DB trapped from kernel mode, so + * that PT_GETDBREGS does not report stale value. FRED updates + * %dr6 despite providing the same information in the + * tf_fred_evdata field. + */ + load_dr6(0); + if (user_dbreg_trap(frame->tf_fred_evdata)) return; /* FALLTHROUGH */