From nobody Tue Nov 03 09:02:14 2026 X-Original-To: dev-commits-src-branches@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 4jJjJ65SV2z6yPZV for ; Tue, 03 Nov 2026 09:02:14 +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 4jJjJ62gtVz4KKr for ; Tue, 03 Nov 2026 09:02:14 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793696534; 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=FPvsSNptVwCPfWDZURwHcRs7ILf5vJ2CJqLM+rnh0fM=; b=h+h/rDmPG0h6a7wyEOqhjiembx62RSLJxG07eNeBLpWRgORAXLYkBBWPWtBQT8yDM/cWpS /zQQlKrU+wvaXyD5aq3c+6QH5lpQgNtCxHJwO+kQVpr8cRpCEKyTybxqdF/hoxF+I6DkZf P4ASw0FrfxW3sJtubGgCGBMUQUYxphP6YO/hsuPZ+XOyRgColh5j0aayV7EjS4JeJWZOEX EZBga/Nn2hpGQbLpA13OpkR2dZI1tPPYaS9eTZ40unZl7xaOjCVNGpD3s5hH87kdTi4eJB kgOdVtsMPAjXu762Z0u4uXexMH/fWi6s6w92xKfLRGiX3UAtDDP9LgIjFa12hg== ARC-Seal: i=1; a=rsa-sha256; d=freebsd.org; s=dkim; cv=none; t=1793696534; b=VorSuNKdyZiv5x2RNt+1nE1s09ukJ7hCHCmDwrLP9pujWXyMPbSc+qgfUd2l0Zt9KSDH4q tuLYNnGWWumi2D3p6Nu0jQzwYVkFg7b1eage+tYaUr+4mBrBR272mn7w3pOwSCFkQiAhr0 /uGYkTpNb+Fpl2kBaF1oknT3KcYq+g0XGsxOPTTjSVmrRr/BnbWhK5XbnGTJA5Bgc5lyos FQHMkYC/0tDbCQ+Cux9Hfp+t6m+OeYV03nAY7EcH6kdowYwSw7oC+vDuQGc9KNyuxKMzGt U41gOy/yCJNNWKBk+nLZrCHzJid1Dxhb6fJlE2tnu7WAHvw3hdvTl3nYWKPMbQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793696534; 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=FPvsSNptVwCPfWDZURwHcRs7ILf5vJ2CJqLM+rnh0fM=; b=lV/yJ6yKiUc++/hmfHS/xsbsfm5UUdxfAPb0CcqNM5UF3orm7LKXJiQQaQ78A+9zbrxBhF 52SATJIIQT8+0R7NshRk9g6WS9RYX4yDq1wAg5eEZ6qCszpE1iFo/iqBdaBefi84IXdYl6 SMnO4dldeg/vcWop4ScjLMnAD85LC+njN+w59+KcIRnfT8VNVf7ui8gPqG+NDCk9b2sE2G RGToYNk23PZhjd9HHI8BHSKyvSV3UDDrFFFax5wbP3iv4dVIFExQvaB39V+lxbLNgguoff rI3Bxpn6lWpQN0njjdVqRipuN1v+nFqBaeoWv0Oowq5+3oSXWqEjLQy9u4UhOg== 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 4jJjJ62Dp1z1PBW for ; Tue, 03 Nov 2026 09:02:14 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 4481a by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Tue, 03 Nov 2026 09:02:14 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Konstantin Belousov Subject: git: 06a534c55900 - stable/15 - amd64 FRED: clear %dr6 on #DB from kernel List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org List-Id: Commits to the stable branches of the FreeBSD 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/stable/15 X-Git-Reftype: branch X-Git-Commit: 06a534c55900c709d3dc6fe9a9d7ea7eac6016e8 Auto-Submitted: auto-generated Date: Tue, 03 Nov 2026 09:02:14 +0000 Message-Id: <6ae9a316.4481a.42c11ec9@gitrepo.freebsd.org> The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=06a534c55900c709d3dc6fe9a9d7ea7eac6016e8 commit 06a534c55900c709d3dc6fe9a9d7ea7eac6016e8 Author: Konstantin Belousov AuthorDate: 2026-10-29 00:57:52 +0000 Commit: Konstantin Belousov CommitDate: 2026-11-03 09:01:16 +0000 amd64 FRED: clear %dr6 on #DB from kernel (cherry picked from commit 837bb27c93a58a2df2f5203393ffa245b93caf31) --- 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 643f4debb0b5..74a1ffd633e1 100644 --- a/sys/amd64/amd64/trap.c +++ b/sys/amd64/amd64/trap.c @@ -1781,6 +1781,14 @@ 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 */