Date: Wed, 29 Jul 2026 16:44:07 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Konstantin Belousov <kib@FreeBSD.org>, src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: 6e93f5e4d693 - main - amd64: FRED support Message-ID: <0c99064d-9ada-4ed9-800e-a0cae178f6c8@FreeBSD.org> In-Reply-To: <6a5e986a.22164.2ca88691@gitrepo.freebsd.org>
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On 7/20/26 17:51, Konstantin Belousov wrote: > The branch main has been updated by kib: > > URL: https://cgit.FreeBSD.org/src/commit/?id=6e93f5e4d6932c423b89dff8fc08d86f8bdeb7b9 > > commit 6e93f5e4d6932c423b89dff8fc08d86f8bdeb7b9 > Author: Konstantin Belousov <kib@FreeBSD.org> > AuthorDate: 2026-02-13 11:24:40 +0000 > Commit: Konstantin Belousov <kib@FreeBSD.org> > CommitDate: 2026-07-20 21:51:02 +0000 > > amd64: FRED support > > FRED support as defined starting from the SDM rev. 90, requires a new > 'events' entry point to receive user and kernel mode exceptions and > interrupts notifications from the hardware. A minimal asm trampoline is > enough, rest can be implemented in C due to the clean FRED organization > of the event reporting. > > The syscall entry is handled by a microptimized assembly path, directly > calling into the amd64_syscall() handler, instead of the generic events > entry point. > > Tested by: emaste > Sponsored by: The FreeBSD Foundation > MFC after: 1 week > Differential revision: https://reviews.freebsd.org/D55829 This appears to have broken the cross-build jobs on GitHub for the past week which build with clang 15 and clang 18. Are those versions too old to support the instructions used here? Sample output: -------------------------------------------------------------- >>> stage 3.1: building everything -------------------------------------------------------------- /home/runner/work/freebsd-src/freebsd-src/sys/amd64/amd64/exception.S:1455:2: error: invalid instruction mnemonic 'eretu' eretu ^~~~~ /home/runner/work/freebsd-src/freebsd-src/sys/amd64/amd64/exception.S:1521:2: error: invalid instruction mnemonic 'lkgs' lkgs %ax ^~~~ /home/runner/work/freebsd-src/freebsd-src/sys/amd64/amd64/exception.S:1542:2: error: invalid instruction mnemonic 'eretu' eretu ^~~~~ /home/runner/work/freebsd-src/freebsd-src/sys/amd64/amd64/exception.S:1662:2: error: invalid instruction mnemonic 'erets' erets ^~~~~ /home/runner/work/freebsd-src/freebsd-src/sys/amd64/amd64/exception.S:1682:2: error: invalid instruction mnemonic 'erets' erets ^~~~~ --- exception.o --- *** [exception.o] Error code 1 (Or maybe clang needs some -m<foo> or .set <foo> to enable use of these instructions?) -- John Baldwinhome | help
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