From nobody Tue Nov 03 09:02:18 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 4jJjJC4tY1z6yQ19 for ; Tue, 03 Nov 2026 09:02:19 +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 4jJjJC0zLSz4KcQ for ; Tue, 03 Nov 2026 09:02:19 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793696539; 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=+JWfehSSR2t+kkpamrTYNoa1qhoqZW0gR/LpIuRm9Hg=; b=FtF/DE28bWKFW+ky08QC/xo29CCIjAGLF8DfNW3DOg7yDTQJNsbSIxkvWfiY5BEQaZSeNI eDRB7sv8GKug402H17UcD/oZ8nlbiNWHpA4GfjMeSoYxD3X3yqwVYpXbx0/a5Nudv37qAu jjUhWJ0YN0a6CsbA4WGEj3aiAHkH3FA5mGNdMQfoyd0UNn4jTzfFkHnFJk3gkKSGxw1vnc giwdb3BfYhGiQIEEDecph8ckrGsBENnB3y9pj/EdVcQqc7Yp57cIHldFXw7a979LXSk/9n lRQgbrei15nHm8s2bODxiHS0N93Ho+kfv9BenlJVT5IIip3tTx6VDIwVfTrrCQ== ARC-Seal: i=1; a=rsa-sha256; d=freebsd.org; s=dkim; cv=none; t=1793696539; b=A+dqRz/qLsjjdd1Hxq/tI6/Z8TmJ7JHeflFKD61hlx9lsjUk+1VHIIvqguWIB1oqjZwrtW RqmvZyiJc5IPo9nxB+7fF9VbLuNYOzRPCASZshjRY1+9N8Pw5uXJaVOUyUtuRoS+oci8xK TQmCVeLBKtELrBuvAZjtiVjWfk4RzCOCHEz/xtySfI1U0nwnkABXYl6FDHc/+EgiasaLYg EoMNmZ8u73k3Ak/Kt8R6iA6u29S9gG9Pt1h8kDD4A8q+VvUmUUTssHmvIpsWUIvUU4XDVc e05ZKoQ3CNvWLFbN4xFSSd7wvVZE5UOb1azZYgVYmEKGi7qf102CAkubdxk2uw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793696539; 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=+JWfehSSR2t+kkpamrTYNoa1qhoqZW0gR/LpIuRm9Hg=; b=YbObp9PMK+iqWmxqwZdarJIMbYCuYQW5MB6Ce+WVuBfQuWlHbCuc6OxcF/Xm3Hf2Og1mSp 3OAZEKvY1Fs7L1CCN5/OepvQ9c4I6KwPcrwfDvRrFAL5FEGqWM9RkjYoaivZ0jNi/22iOL 9+ecqeS0glvMdKPNXH2haby1YtJlTRFBRfV52IhtaGfLtJAFYwp+YKOCPVNxA2HjpyMoJc 2MF/G9OExqr0KpzrIaf2ii57S2AIielvgCOv8Mbm2T+f/gcRyPt93tvjaspt3/l9iaB875 pMhyP0wmi34vxjwg4KEIfj1kIYley4JqQ2rWmV0IGmUSC1MQJ7VdH2+bNYpvyw== 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 4jJjJB5XWmz1PTX for ; Tue, 03 Nov 2026 09:02:18 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 454b2 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Tue, 03 Nov 2026 09:02:18 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Konstantin Belousov Subject: git: 0ecc788089b9 - stable/15 - amd64 FRED: explain why %rax is saved early 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: 0ecc788089b932d097bb1ccad81ba064443c87db Auto-Submitted: auto-generated Date: Tue, 03 Nov 2026 09:02:18 +0000 Message-Id: <6ae9a31a.454b2.1685740e@gitrepo.freebsd.org> The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=0ecc788089b932d097bb1ccad81ba064443c87db commit 0ecc788089b932d097bb1ccad81ba064443c87db Author: Konstantin Belousov AuthorDate: 2026-10-29 01:16:49 +0000 Commit: Konstantin Belousov CommitDate: 2026-11-03 09:01:17 +0000 amd64 FRED: explain why %rax is saved early (cherry picked from commit 6105e8589b2cd7f9001df045392c30fc86900633) --- sys/amd64/amd64/exception.S | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sys/amd64/amd64/exception.S b/sys/amd64/amd64/exception.S index b0ed398a36b4..e7e91cded2fc 100644 --- a/sys/amd64/amd64/exception.S +++ b/sys/amd64/amd64/exception.S @@ -1639,6 +1639,10 @@ fred_eretu_fault: .globl fred_events_handlers, fred_events_handlers_end fred_events_handlers: subq $TF_ERR,%rsp + /* + * %rax is saved early both to provide a free register and to + * show the right syscall number in ddb backtrace. + */ movq %rax,TF_RAX(%rsp) movq %rdi,TF_RDI(%rsp) movq %rsi,TF_RSI(%rsp)