From nobody Thu Oct 29 01:35:05 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 4jFRcT5VCjz6xWtb for ; Thu, 29 Oct 2026 01:35:05 +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 4jFRcT139xz4Dgd for ; Thu, 29 Oct 2026 01:35:05 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793237705; 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=MZW4DBaIuSm/34aIA+ByojCGSMRl0TzF+Ip49jFvcfA=; b=nmbP0AGchA5NZSEHHF7p1eDB0hBPQu9N2m3S7u5XDz7EYm4aHTJLKcee9Yvb/iPjSX8AJ2 T0hNKBNaA8u3Qdfry3V5T4GT3JT6gkl4Weq7JWBoYQHX221B8is+qdNkOxrJKC06g4Obvc 9bNcZsW1QmuTHdJNlFoAquVT/bQuFW7sPhUcZbALoee57wYIGa7Exl6lX1KwyYRW6aqekl eeOxf+hlJeF6vbM9yQ0LwhJtpQtVqXejOls419id0BdCBCNOsCIlSnOC2C/6uqckoLrBkj Mj7kXW4M7+Z8k6PjtA87But8uqw5HVcJTfKoAEOXRdhzCK9FJhzqBaWeVhteaA== ARC-Seal: i=1; a=rsa-sha256; d=freebsd.org; s=dkim; cv=none; t=1793237705; b=S52mFjt6A6hHYY4trvByu+jUwK00X6vLh/XcVkvdB5ccZF/LzkvKictTVYr0rUyk4LW7Si 9LMywlpeBUlWZDNOnFeAaaVHkr4+kkWWbYlHQXZ2pg0DNpNZnoUA7BQsTp/1eR+sYyylXO mbuiRsZpqGlNKr23yl8EygyWroFGcdGiN9g0dCi6shEeR/y4hNdqMp/RjvFEgWsyQpwAW/ zL5zuIbtOoHA5Ov9cCxiA5hOi4XFSwgqp7j7tO3EWzMVJwrRpX1jsogwU2a7/3vRvLpfy1 FmcmlsEFDdqatBM780X0WJco/PmsoeAHoaWcTLkOSkNnG+xDAvoC7fLTkzPQEQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1793237705; 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=MZW4DBaIuSm/34aIA+ByojCGSMRl0TzF+Ip49jFvcfA=; b=icAjwG/SjXNabH7aEYD56wpGGL+fpXPZ4JS9/Mx8DIUDiRrGxnJC3z+HGEkZRLmm/C/TJz dVNO9YAX0gKHvMLPrkMyDUJTRExN1mZZYdLt3oAgEtBsVPknQLiw+Dn4uiNRLdrBY5wMOs d6Ez/nsaYE9e/qZjAF8LSlWSBknrAaUbIUgJuLSVV0WDe0jAzI12pzsQpIpbTNNoY8NtMK 2uhQxu/cTQCbqWs8uLtFxCOquHy+EkoJIe4m9XXnTPuM7gKe8j3wEZXy5Ss/JFO739MPrH S6sDEIDx7maAgKrFrZflavMZI+TjBAHk8a6Oq7a81X8g2Pil4qxTS5U2UJ83iw== 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 4jFRcT0jzzzHrW for ; Thu, 29 Oct 2026 01:35:05 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 42948 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Thu, 29 Oct 2026 01:35:05 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Konstantin Belousov Subject: git: 6105e8589b2c - main - amd64 FRED: explain why %rax is saved early 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: 6105e8589b2cd7f9001df045392c30fc86900633 Auto-Submitted: auto-generated Date: Thu, 29 Oct 2026 01:35:05 +0000 Message-Id: <6ae2a2c9.42948.493e0fd0@gitrepo.freebsd.org> The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=6105e8589b2cd7f9001df045392c30fc86900633 commit 6105e8589b2cd7f9001df045392c30fc86900633 Author: Konstantin Belousov AuthorDate: 2026-10-29 01:16:49 +0000 Commit: Konstantin Belousov CommitDate: 2026-10-29 01:33:47 +0000 amd64 FRED: explain why %rax is saved early Sponsored by: The FreeBSD Foundation MFC after: 1 week --- 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 6ec37032bc05..b9fc09d7f26f 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)