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[2620:137:e000::1:20]) by mx.google.com with ESMTP id s14-20020a17090ad48e00b00262e5a82047si2316966pju.44.2023.08.30.11.52.27; Wed, 30 Aug 2023 11:52:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=MkefpL60; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238523AbjH3Shx (ORCPT + 99 others); Wed, 30 Aug 2023 14:37:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245610AbjH3Pkt (ORCPT ); Wed, 30 Aug 2023 11:40:49 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A63E6122 for ; Wed, 30 Aug 2023 08:40:46 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2E4F46068C for ; Wed, 30 Aug 2023 15:40:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8EA86C433C8 for ; Wed, 30 Aug 2023 15:40:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1693410045; bh=OfkHF940V8bVlz017j5dgKgrTL7TlTWtYOhd5+ZFIhc=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=MkefpL604gjUcgnnQWdj27r6PUEqsrYz3mbmOtnNPXuP8tlbA4sG0N8eFitSS7Liq 7gUmYBc+jRf/p14vIdo/n2vJbVr4vissQTeyluIQ6M24sQUosknBh0DzU1CfPDFrI9 YtIkMW8RkNk3la2P8C8Lw5G7IOoVPdJl1bHXjskIGBrdKJhCKFO/H/aIvWGAbJ+cmN eSmHegLbPbQg8MwoCm3cQLmNBqMkjBPgc8JB0slf5hzcUMvOK0zC6yykoyroHQWt4o g/xz0s56tkCwswqEwc25nAE6UdzB5usfGw9mMTQ0PYM1IWkoGK9HrprFmwLysorwm6 YJt2cYgsW+e4w== Received: by mail-lj1-f177.google.com with SMTP id 38308e7fff4ca-2bd0a5a5abbso56683231fa.0 for ; Wed, 30 Aug 2023 08:40:45 -0700 (PDT) X-Gm-Message-State: AOJu0YwdfYNCoCUsclZpg9yzEDo2AEerW3Zy2rwnh6Zz+zuRbjY4e4pk zgM0yv0dDwRXQKQmyqnmgNOiokTpFnoqEg8kKrM= X-Received: by 2002:a2e:90d6:0:b0:2bc:b9c7:7ba3 with SMTP id o22-20020a2e90d6000000b002bcb9c77ba3mr2429625ljg.12.1693410043510; Wed, 30 Aug 2023 08:40:43 -0700 (PDT) MIME-Version: 1.0 References: <20230830010435.2969785-1-liweihao@loongson.cn> In-Reply-To: <20230830010435.2969785-1-liweihao@loongson.cn> From: Huacai Chen Date: Wed, 30 Aug 2023 23:40:32 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/1] LoongArch: adjust copy/clear_user exception handler behavior To: liweihao Cc: kernel@xen0n.name, wangrui@loongson.cn, masahiroy@kernel.org, yijun@loongson.cn, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Weihao, The title should be "LoongArch: Adjust {copy, clear}_user exception handler behavior" and 1/1 is unnecessary. Commit logs also need similar adjustments. On Wed, Aug 30, 2023 at 9:04=E2=80=AFAM liweihao wro= te: > > The copy/clear_user function should returns number of bytes that could > not be copied/cleared. So, try to copy/clear byte by byte when ld.d/w/h > and st.d/w/h trapped into an exception. > > Signed-off-by: liweihao Your email format should be "Weihao Li " Huacai > --- > arch/loongarch/lib/clear_user.S | 87 ++++++++--------- > arch/loongarch/lib/copy_user.S | 161 ++++++++++++++++---------------- > 2 files changed, 127 insertions(+), 121 deletions(-) > > diff --git a/arch/loongarch/lib/clear_user.S b/arch/loongarch/lib/clear_u= ser.S > index 0790eadce166..9b6eef569f89 100644 > --- a/arch/loongarch/lib/clear_user.S > +++ b/arch/loongarch/lib/clear_user.S > @@ -11,19 +11,6 @@ > #include > #include > > -.irp to, 0, 1, 2, 3, 4, 5, 6, 7 > -.L_fixup_handle_\to\(): > - sub.d a0, a2, a0 > - addi.d a0, a0, (\to) * (-8) > - jr ra > -.endr > - > -.irp to, 0, 2, 4 > -.L_fixup_handle_s\to\(): > - addi.d a0, a1, -\to > - jr ra > -.endr > - > SYM_FUNC_START(__clear_user) > /* > * Some CPUs support hardware unaligned access > @@ -51,7 +38,7 @@ SYM_FUNC_START(__clear_user_generic) > 2: move a0, a1 > jr ra > > - _asm_extable 1b, .L_fixup_handle_s0 > + _asm_extable 1b, 2b > SYM_FUNC_END(__clear_user_generic) > > /* > @@ -173,33 +160,47 @@ SYM_FUNC_START(__clear_user_fast) > jr ra > > /* fixup and ex_table */ > - _asm_extable 0b, .L_fixup_handle_0 > - _asm_extable 1b, .L_fixup_handle_0 > - _asm_extable 2b, .L_fixup_handle_1 > - _asm_extable 3b, .L_fixup_handle_2 > - _asm_extable 4b, .L_fixup_handle_3 > - _asm_extable 5b, .L_fixup_handle_4 > - _asm_extable 6b, .L_fixup_handle_5 > - _asm_extable 7b, .L_fixup_handle_6 > - _asm_extable 8b, .L_fixup_handle_7 > - _asm_extable 9b, .L_fixup_handle_0 > - _asm_extable 10b, .L_fixup_handle_1 > - _asm_extable 11b, .L_fixup_handle_2 > - _asm_extable 12b, .L_fixup_handle_3 > - _asm_extable 13b, .L_fixup_handle_0 > - _asm_extable 14b, .L_fixup_handle_1 > - _asm_extable 15b, .L_fixup_handle_0 > - _asm_extable 16b, .L_fixup_handle_0 > - _asm_extable 17b, .L_fixup_handle_s0 > - _asm_extable 18b, .L_fixup_handle_s0 > - _asm_extable 19b, .L_fixup_handle_s0 > - _asm_extable 20b, .L_fixup_handle_s2 > - _asm_extable 21b, .L_fixup_handle_s0 > - _asm_extable 22b, .L_fixup_handle_s0 > - _asm_extable 23b, .L_fixup_handle_s4 > - _asm_extable 24b, .L_fixup_handle_s0 > - _asm_extable 25b, .L_fixup_handle_s4 > - _asm_extable 26b, .L_fixup_handle_s0 > - _asm_extable 27b, .L_fixup_handle_s4 > - _asm_extable 28b, .L_fixup_handle_s0 > +.Llarge_fixup: > + sub.d a1, a2, a0 > + > +.Lsmall_fixup: > +29: st.b zero, a0, 0 > + addi.d a0, a0, 1 > + addi.d a1, a1, -1 > + bgt a1, zero, 1b > + > +.Lexit: > + move a0, a1 > + jr ra > + > + _asm_extable 0b, .Lsmall_fixup > + _asm_extable 1b, .Llarge_fixup > + _asm_extable 2b, .Llarge_fixup > + _asm_extable 3b, .Llarge_fixup > + _asm_extable 4b, .Llarge_fixup > + _asm_extable 5b, .Llarge_fixup > + _asm_extable 6b, .Llarge_fixup > + _asm_extable 7b, .Llarge_fixup > + _asm_extable 8b, .Llarge_fixup > + _asm_extable 9b, .Llarge_fixup > + _asm_extable 10b, .Llarge_fixup > + _asm_extable 11b, .Llarge_fixup > + _asm_extable 12b, .Llarge_fixup > + _asm_extable 13b, .Llarge_fixup > + _asm_extable 14b, .Llarge_fixup > + _asm_extable 15b, .Llarge_fixup > + _asm_extable 16b, .Llarge_fixup > + _asm_extable 17b, .Lexit > + _asm_extable 18b, .Lsmall_fixup > + _asm_extable 19b, .Lsmall_fixup > + _asm_extable 20b, .Lsmall_fixup > + _asm_extable 21b, .Lsmall_fixup > + _asm_extable 22b, .Lsmall_fixup > + _asm_extable 23b, .Lsmall_fixup > + _asm_extable 24b, .Lsmall_fixup > + _asm_extable 25b, .Lsmall_fixup > + _asm_extable 26b, .Lsmall_fixup > + _asm_extable 27b, .Lsmall_fixup > + _asm_extable 28b, .Lsmall_fixup > + _asm_extable 29b, .Lexit > SYM_FUNC_END(__clear_user_fast) > diff --git a/arch/loongarch/lib/copy_user.S b/arch/loongarch/lib/copy_use= r.S > index bfe3d2793d00..feec3d362803 100644 > --- a/arch/loongarch/lib/copy_user.S > +++ b/arch/loongarch/lib/copy_user.S > @@ -11,19 +11,6 @@ > #include > #include > > -.irp to, 0, 1, 2, 3, 4, 5, 6, 7 > -.L_fixup_handle_\to\(): > - sub.d a0, a2, a0 > - addi.d a0, a0, (\to) * (-8) > - jr ra > -.endr > - > -.irp to, 0, 2, 4 > -.L_fixup_handle_s\to\(): > - addi.d a0, a2, -\to > - jr ra > -.endr > - > SYM_FUNC_START(__copy_user) > /* > * Some CPUs support hardware unaligned access > @@ -54,8 +41,8 @@ SYM_FUNC_START(__copy_user_generic) > 3: move a0, a2 > jr ra > > - _asm_extable 1b, .L_fixup_handle_s0 > - _asm_extable 2b, .L_fixup_handle_s0 > + _asm_extable 1b, 3b > + _asm_extable 2b, 3b > SYM_FUNC_END(__copy_user_generic) > > /* > @@ -69,10 +56,10 @@ SYM_FUNC_START(__copy_user_fast) > sltui t0, a2, 9 > bnez t0, .Lsmall > > - add.d a3, a1, a2 > - add.d a2, a0, a2 > 0: ld.d t0, a1, 0 > 1: st.d t0, a0, 0 > + add.d a3, a1, a2 > + add.d a2, a0, a2 > > /* align up destination address */ > andi t1, a0, 7 > @@ -94,7 +81,6 @@ SYM_FUNC_START(__copy_user_fast) > 7: ld.d t5, a1, 40 > 8: ld.d t6, a1, 48 > 9: ld.d t7, a1, 56 > - addi.d a1, a1, 64 > 10: st.d t0, a0, 0 > 11: st.d t1, a0, 8 > 12: st.d t2, a0, 16 > @@ -103,6 +89,7 @@ SYM_FUNC_START(__copy_user_fast) > 15: st.d t5, a0, 40 > 16: st.d t6, a0, 48 > 17: st.d t7, a0, 56 > + addi.d a1, a1, 64 > addi.d a0, a0, 64 > bltu a1, a4, .Lloop64 > > @@ -114,11 +101,11 @@ SYM_FUNC_START(__copy_user_fast) > 19: ld.d t1, a1, 8 > 20: ld.d t2, a1, 16 > 21: ld.d t3, a1, 24 > - addi.d a1, a1, 32 > 22: st.d t0, a0, 0 > 23: st.d t1, a0, 8 > 24: st.d t2, a0, 16 > 25: st.d t3, a0, 24 > + addi.d a1, a1, 32 > addi.d a0, a0, 32 > > .Llt32: > @@ -126,9 +113,9 @@ SYM_FUNC_START(__copy_user_fast) > bgeu a1, a4, .Llt16 > 26: ld.d t0, a1, 0 > 27: ld.d t1, a1, 8 > - addi.d a1, a1, 16 > 28: st.d t0, a0, 0 > 29: st.d t1, a0, 8 > + addi.d a1, a1, 16 > addi.d a0, a0, 16 > > .Llt16: > @@ -136,6 +123,7 @@ SYM_FUNC_START(__copy_user_fast) > bgeu a1, a4, .Llt8 > 30: ld.d t0, a1, 0 > 31: st.d t0, a0, 0 > + addi.d a1, a1, 8 > addi.d a0, a0, 8 > > .Llt8: > @@ -214,62 +202,79 @@ SYM_FUNC_START(__copy_user_fast) > jr ra > > /* fixup and ex_table */ > - _asm_extable 0b, .L_fixup_handle_0 > - _asm_extable 1b, .L_fixup_handle_0 > - _asm_extable 2b, .L_fixup_handle_0 > - _asm_extable 3b, .L_fixup_handle_0 > - _asm_extable 4b, .L_fixup_handle_0 > - _asm_extable 5b, .L_fixup_handle_0 > - _asm_extable 6b, .L_fixup_handle_0 > - _asm_extable 7b, .L_fixup_handle_0 > - _asm_extable 8b, .L_fixup_handle_0 > - _asm_extable 9b, .L_fixup_handle_0 > - _asm_extable 10b, .L_fixup_handle_0 > - _asm_extable 11b, .L_fixup_handle_1 > - _asm_extable 12b, .L_fixup_handle_2 > - _asm_extable 13b, .L_fixup_handle_3 > - _asm_extable 14b, .L_fixup_handle_4 > - _asm_extable 15b, .L_fixup_handle_5 > - _asm_extable 16b, .L_fixup_handle_6 > - _asm_extable 17b, .L_fixup_handle_7 > - _asm_extable 18b, .L_fixup_handle_0 > - _asm_extable 19b, .L_fixup_handle_0 > - _asm_extable 20b, .L_fixup_handle_0 > - _asm_extable 21b, .L_fixup_handle_0 > - _asm_extable 22b, .L_fixup_handle_0 > - _asm_extable 23b, .L_fixup_handle_1 > - _asm_extable 24b, .L_fixup_handle_2 > - _asm_extable 25b, .L_fixup_handle_3 > - _asm_extable 26b, .L_fixup_handle_0 > - _asm_extable 27b, .L_fixup_handle_0 > - _asm_extable 28b, .L_fixup_handle_0 > - _asm_extable 29b, .L_fixup_handle_1 > - _asm_extable 30b, .L_fixup_handle_0 > - _asm_extable 31b, .L_fixup_handle_0 > - _asm_extable 32b, .L_fixup_handle_0 > - _asm_extable 33b, .L_fixup_handle_0 > - _asm_extable 34b, .L_fixup_handle_s0 > - _asm_extable 35b, .L_fixup_handle_s0 > - _asm_extable 36b, .L_fixup_handle_s0 > - _asm_extable 37b, .L_fixup_handle_s0 > - _asm_extable 38b, .L_fixup_handle_s0 > - _asm_extable 39b, .L_fixup_handle_s0 > - _asm_extable 40b, .L_fixup_handle_s0 > - _asm_extable 41b, .L_fixup_handle_s2 > - _asm_extable 42b, .L_fixup_handle_s0 > - _asm_extable 43b, .L_fixup_handle_s0 > - _asm_extable 44b, .L_fixup_handle_s0 > - _asm_extable 45b, .L_fixup_handle_s0 > - _asm_extable 46b, .L_fixup_handle_s0 > - _asm_extable 47b, .L_fixup_handle_s4 > - _asm_extable 48b, .L_fixup_handle_s0 > - _asm_extable 49b, .L_fixup_handle_s0 > - _asm_extable 50b, .L_fixup_handle_s0 > - _asm_extable 51b, .L_fixup_handle_s4 > - _asm_extable 52b, .L_fixup_handle_s0 > - _asm_extable 53b, .L_fixup_handle_s0 > - _asm_extable 54b, .L_fixup_handle_s0 > - _asm_extable 55b, .L_fixup_handle_s4 > - _asm_extable 56b, .L_fixup_handle_s0 > - _asm_extable 57b, .L_fixup_handle_s0 > +.Llarge_fixup: > + sub.d a2, a2, a0 > + > +.Lsmall_fixup: > +58: ld.b t0, a1, 0 > +59: st.b t0, a0, 0 > + addi.d a0, a0, 1 > + addi.d a1, a1, 1 > + addi.d a2, a2, -1 > + bgt a2, zero, 58b > + > +.Lexit: > + move a0, a2 > + jr ra > + > + _asm_extable 0b, .Lsmall_fixup > + _asm_extable 1b, .Lsmall_fixup > + _asm_extable 2b, .Llarge_fixup > + _asm_extable 3b, .Llarge_fixup > + _asm_extable 4b, .Llarge_fixup > + _asm_extable 5b, .Llarge_fixup > + _asm_extable 6b, .Llarge_fixup > + _asm_extable 7b, .Llarge_fixup > + _asm_extable 8b, .Llarge_fixup > + _asm_extable 9b, .Llarge_fixup > + _asm_extable 10b, .Llarge_fixup > + _asm_extable 11b, .Llarge_fixup > + _asm_extable 12b, .Llarge_fixup > + _asm_extable 13b, .Llarge_fixup > + _asm_extable 14b, .Llarge_fixup > + _asm_extable 15b, .Llarge_fixup > + _asm_extable 16b, .Llarge_fixup > + _asm_extable 17b, .Llarge_fixup > + _asm_extable 18b, .Llarge_fixup > + _asm_extable 19b, .Llarge_fixup > + _asm_extable 20b, .Llarge_fixup > + _asm_extable 21b, .Llarge_fixup > + _asm_extable 22b, .Llarge_fixup > + _asm_extable 23b, .Llarge_fixup > + _asm_extable 24b, .Llarge_fixup > + _asm_extable 25b, .Llarge_fixup > + _asm_extable 26b, .Llarge_fixup > + _asm_extable 27b, .Llarge_fixup > + _asm_extable 28b, .Llarge_fixup > + _asm_extable 29b, .Llarge_fixup > + _asm_extable 30b, .Llarge_fixup > + _asm_extable 31b, .Llarge_fixup > + _asm_extable 32b, .Llarge_fixup > + _asm_extable 33b, .Llarge_fixup > + _asm_extable 34b, .Lexit > + _asm_extable 35b, .Lexit > + _asm_extable 36b, .Lsmall_fixup > + _asm_extable 37b, .Lsmall_fixup > + _asm_extable 38b, .Lsmall_fixup > + _asm_extable 39b, .Lsmall_fixup > + _asm_extable 40b, .Lsmall_fixup > + _asm_extable 41b, .Lsmall_fixup > + _asm_extable 42b, .Lsmall_fixup > + _asm_extable 43b, .Lsmall_fixup > + _asm_extable 44b, .Lsmall_fixup > + _asm_extable 45b, .Lsmall_fixup > + _asm_extable 46b, .Lsmall_fixup > + _asm_extable 47b, .Lsmall_fixup > + _asm_extable 48b, .Lsmall_fixup > + _asm_extable 49b, .Lsmall_fixup > + _asm_extable 50b, .Lsmall_fixup > + _asm_extable 51b, .Lsmall_fixup > + _asm_extable 52b, .Lsmall_fixup > + _asm_extable 53b, .Lsmall_fixup > + _asm_extable 54b, .Lsmall_fixup > + _asm_extable 55b, .Lsmall_fixup > + _asm_extable 56b, .Lsmall_fixup > + _asm_extable 57b, .Lsmall_fixup > + _asm_extable 58b, .Lexit > + _asm_extable 59b, .Lexit > SYM_FUNC_END(__copy_user_fast) > -- > 2.39.2 > >