From nobody Mon Jan 10 21:14:54 2022 X-Original-To: dev-commits-src-main@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 55EB719482DD for ; Mon, 10 Jan 2022 21:15:06 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-vk1-xa32.google.com (mail-vk1-xa32.google.com [IPv6:2607:f8b0:4864:20::a32]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4JXmn61mfqz4WXS for ; Mon, 10 Jan 2022 21:15:06 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: by mail-vk1-xa32.google.com with SMTP id 191so4370763vkc.1 for ; Mon, 10 Jan 2022 13:15:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20210112.gappssmtp.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=eaThwoJfzw5uRVmxig5vQvjj3//7sgq4BmCfkgM1/3M=; b=Ox5hQgLjW9d+CleQSwZMyDtHf1Nd7tntmcI9I7l6a3jU2Nkjjrne7BJ0iUvpRNb0cA UKKwTqEXNz4DmU1jzB1+4++ZfG8hNv8vmGr/1SXe0b1O77YDq6f1Okta7MSglwZ6cv/y 5Q8evztGAOoVY+xGJzhEajVt/r5LasVty9Wx55fGwoGG3nUgRNb+jowD8Fse+EhZL3EI VDRiiYFxYgRrSWZAd2gds6aMGXrNIJkRVF4BfILfEG6qz2YPB6nbMW9jIt9W4CzyL8vB S0mUtPvDCH/tx9iQ0O8JJ8rQghUtcqOEXTcryj7xC/36qgGZz9PSs5fdwWcFNmswg/vi li+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=eaThwoJfzw5uRVmxig5vQvjj3//7sgq4BmCfkgM1/3M=; b=aOUQV0ijUnT3snOXovcepx8ahnV3PhCB9sC66qQmxxQjO7u+trDJTpWz6FQO2iN1Ns dJPbtAF7/CTwFO+II4iNrfhrXjb/DINjdYqiSa/106c/MK6FPLpfCOorj0dLgRPYfdv1 z7/73bBCnv3Yahk+SrBF5wWCiryC0RaKlHrApbufRIsX/inOwVf69EbOcvKns2BRh4+J EgyM6xY/ZbkeyHG4FANFoPGtw6AcoqYdQ5RimK1z2vlIhCwJgb/rV3hA5RN9g13emxS2 3TJGpaLLW8EmL7unuuSJblA4ed2s7HchqnOTdIr3yhI+tUmeeSToFhvE0BZ2C9/A6V1Z WpzA== X-Gm-Message-State: AOAM533uuEFgpMX21MjXxg+PWhUgyCNQ5UVCl04ZsoDW3jyLdqxOZpnS NcKdC7diGMWe/iZ512vlN5NrL4sqHcQWa6CunRTrDg== X-Google-Smtp-Source: ABdhPJySmnotlU8c5MT8oqKbCJ/TL9JT+u1xmCi2KQa8193PW+RrWzuAnK+Jfr8sUdgj+rON5U++TzlBp9GiQAE2Mdo= X-Received: by 2002:a05:6122:1805:: with SMTP id ay5mr709624vkb.5.1641849305401; Mon, 10 Jan 2022 13:15:05 -0800 (PST) List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org MIME-Version: 1.0 References: <202201071627.207GRsGX062055@gitrepo.freebsd.org> <45275428-75e2-aaae-bed3-e5e84b39e17c@FreeBSD.org> In-Reply-To: <45275428-75e2-aaae-bed3-e5e84b39e17c@FreeBSD.org> From: Warner Losh Date: Mon, 10 Jan 2022 14:14:54 -0700 Message-ID: Subject: Re: git: d6c0538dae8d - main - ddb: Remove SOFTWARE_SSTEP support To: John Baldwin Cc: Warner Losh , src-committers , "" , dev-commits-src-main@freebsd.org Content-Type: multipart/alternative; boundary="0000000000009f9db005d540d4e8" X-Rspamd-Queue-Id: 4JXmn61mfqz4WXS X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: N --0000000000009f9db005d540d4e8 Content-Type: text/plain; charset="UTF-8" On Mon, Jan 10, 2022 at 12:48 PM John Baldwin wrote: > On 1/7/22 8:27 AM, Warner Losh wrote: > > The branch main has been updated by imp: > > > > URL: > https://cgit.FreeBSD.org/src/commit/?id=d6c0538dae8d138219dfd051994a44c50e741212 > > > > commit d6c0538dae8d138219dfd051994a44c50e741212 > > Author: Warner Losh > > AuthorDate: 2022-01-07 16:25:33 +0000 > > Commit: Warner Losh > > CommitDate: 2022-01-07 16:25:33 +0000 > > > > ddb: Remove SOFTWARE_SSTEP support > > > > It was needed for mips only, and only kinda sorta worked for mips. > It > > can be brought back if we grow another architecture that need it. > > > > Sponsored by: Netflix > > RISC-V would need it in theory (no hardware single step), but no one has > felt the > need to implement the backend support for it. I think 32-bit arm doesn't > support > hardware single step either (but again, no one has bothered to add the > backend > support). > Generally, I agree with these thoughts. I went ahead with the removal because I knew it would be easy to bring back, even years from now should someone[tm] have an implementation for those platforms (though I thought 32-bit arm did have single step in hardware). Should I put it back? Or should we wait until someone shows up with support for a supported platform? Warner --0000000000009f9db005d540d4e8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Mon, Jan 10, 2022 at 12:48 PM John= Baldwin <jhb@freebsd.org> wro= te:
On 1/7/22 8:= 27 AM, Warner Losh wrote:
> The branch main has been updated by imp:
>
> URL: https://= cgit.FreeBSD.org/src/commit/?id=3Dd6c0538dae8d138219dfd051994a44c50e741212<= /a>
>
> commit d6c0538dae8d138219dfd051994a44c50e741212
> Author:=C2=A0 =C2=A0 =C2=A0Warner Losh <imp@FreeBSD.org>
> AuthorDate: 2022-01-07 16:25:33 +0000
> Commit:=C2=A0 =C2=A0 =C2=A0Warner Losh <imp@FreeBSD.org>
> CommitDate: 2022-01-07 16:25:33 +0000
>
>=C2=A0 =C2=A0 =C2=A0 ddb: Remove SOFTWARE_SSTEP support
>=C2=A0 =C2=A0 =C2=A0
>=C2=A0 =C2=A0 =C2=A0 It was needed for mips only, and only kinda sorta = worked for mips. It
>=C2=A0 =C2=A0 =C2=A0 can be brought back if we grow another architectur= e that need it.
>=C2=A0 =C2=A0 =C2=A0
>=C2=A0 =C2=A0 =C2=A0 Sponsored by:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0Netflix

RISC-V would need it in theory (no hardware single step), but no one has fe= lt the
need to implement the backend support for it.=C2=A0 I think 32-bit arm does= n't support
hardware single step either (but again, no one has bothered to add the back= end
support).


<= div>a supported platform?

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