From nobody Fri Oct 3 06:37:02 2025 Received: from outpost1.zedat.fu-berlin.de (outpost1.zedat.fu-berlin.de [130.133.4.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BE26425A326; Thu, 4 Sep 2025 18:54:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=130.133.4.66 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757012060; cv=none; b=obohlqxhqQ74Nc5ODS2D1LGkebDoqTcHZiBQxj6uFyR8ZEpGevGCwZbkE7no0w+0s25EL1MFkD/1hBhhtozdgVJlOzm6uI/y3mDe4+nYwu/IXL+9HKrotMhjDDnc33MRIYMb2GjxNAdXZRNd2amLh5GqOxWkn6QLBu6dmAbdhdA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757012060; c=relaxed/simple; bh=gzjMSw6QtigrKTOlUkVEne3UQYMEa6V3p1Ajck3/3Oo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=uZmHBXY3dRWanSWk3gvq4eH90hXgUWo/uOnpzUrgkUZpQyum/iiSiz2Iufb19OagWs4DjwRZhOoMxTKlJP1OVQPng37h1cbUo0GaV4CzBzvmxV0SbiBGumYQLjfjZ+FKZPOo/o5NykXt3jdJHBUM/0+SCf4sBWYPMf7uANBvY1Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mkarcher.dialup.fu-berlin.de; spf=pass smtp.mailfrom=zedat.fu-berlin.de; dkim=pass (2048-bit key) header.d=fu-berlin.de header.i=@fu-berlin.de header.b=nSyPOnY7; arc=none smtp.client-ip=130.133.4.66 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mkarcher.dialup.fu-berlin.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zedat.fu-berlin.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=fu-berlin.de header.i=@fu-berlin.de header.b="nSyPOnY7" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=fu-berlin.de; s=fub01; h=Cc:To:In-Reply-To:References:Message-Id: Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date:From:From: Reply-To:Subject:Date:Message-ID:To:Cc:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:In-Reply-To: References; bh=UBNpO1wJh4cVZS7g0wl9pBz7Y+DS8dws4dgo0ahtEvI=; t=1757012057; x=1757616857; b=nSyPOnY79za8ZBinGarsOHpRZ9nxPnocn0WBDp7SB5ImjRsszsMEKv+hRnLCe euNnEzclThRPhmTpF7iWtPB6qfKqT1Edj+Dnl2YVbJQL1FTSl4RQyBpMNmwFZvYXYvxmNu1TC39ii 0j1/IlBgUOK+ew2oLIsyuKtnyjWTwHPxNOdcvx/tbmwrC/B9KfFSPWyxIcpPxindTH2MEKv97IsIw M/vkQtXM/emjXnZRKsiiN1qwRSpV94fEqFG4jw8TPa7XQ4RU9hqdypsMbrsDEjMiaF/IhCwB0FKsY T9BLUhFmB42JzPTH3n97CUDBKHxOhYWXgDUuW6kdzawaPjWKqg==; Received: from inpost2.zedat.fu-berlin.de ([130.133.4.69]) by outpost.zedat.fu-berlin.de (Exim 4.98) with esmtps (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from ) id 1uuF68-00000000Lyn-0MyW; Thu, 04 Sep 2025 20:54:16 +0200 Received: from 89-103-142-46.pool.kielnet.net ([46.142.103.89] helo=Geist14.) by inpost2.zedat.fu-berlin.de (Exim 4.98) with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (envelope-from ) id 1uuF67-00000001W6v-3t4j; Thu, 04 Sep 2025 20:54:16 +0200 From: Michael Karcher Date: Thu, 04 Sep 2025 20:53:55 +0200 Subject: [PATCH v2 5/5] sparc: fix accurate exception reporting in copy_{from,to}_user for M7 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250904-memcpy_series-v2-5-9806dd1784e7@mkarcher.dialup.fu-berlin.de> References: <20250904-memcpy_series-v2-0-9806dd1784e7@mkarcher.dialup.fu-berlin.de> In-Reply-To: <20250904-memcpy_series-v2-0-9806dd1784e7@mkarcher.dialup.fu-berlin.de> To: Andreas Larsson , Babu Moger Cc: sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Karcher , John Paul Adrian Glaubitz , Anthony Yznaga X-Mailer: b4 0.14.2 X-Original-Sender: kernel@mkarcher.dialup.fu-berlin.de X-ZEDAT-Hint: PO The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from = the respective function and ca= lculate the remaining bytes left to copy using the current register contents. This commit fixes a couple of bad calculations. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged. Fixes: 34060b8fffa7 ("arch/sparc: Add accurate exception reporting in M7mem= cpy") Tested-by: John Paul Adrian Glaubitz Signed-off-by: Michael Karcher --- arch/sparc/lib/M7memcpy.S | 20 ++++++++++---------- arch/sparc/lib/Memcpy_utils.S | 9 +++++++++ 2 files changed, 19 insertions(+), 10 deletions(-) diff --git a/arch/sparc/lib/M7memcpy.S b/arch/sparc/lib/M7memcpy.S index cbd42ea7c3f7c25a369536eaf8d0b28a808ae5ba..99357bfa8e82ad7cf15dfd04117= c89b905082f5b 100644 --- a/arch/sparc/lib/M7memcpy.S +++ b/arch/sparc/lib/M7memcpy.S @@ -696,16 +696,16 @@ FUNC_NAME: EX_LD_FP(LOAD(ldd, %o4+40, %f26), memcpy_retl_o2_plus_o5_plus_40) faligndata %f24, %f26, %f10 EX_ST_FP(STORE(std, %f6, %o0+24), memcpy_retl_o2_plus_o5_plus_40) - EX_LD_FP(LOAD(ldd, %o4+48, %f28), memcpy_retl_o2_plus_o5_plus_40) + EX_LD_FP(LOAD(ldd, %o4+48, %f28), memcpy_retl_o2_plus_o5_plus_32) faligndata %f26, %f28, %f12 - EX_ST_FP(STORE(std, %f8, %o0+32), memcpy_retl_o2_plus_o5_plus_40) + EX_ST_FP(STORE(std, %f8, %o0+32), memcpy_retl_o2_plus_o5_plus_32) add %o4, 64, %o4 - EX_LD_FP(LOAD(ldd, %o4-8, %f30), memcpy_retl_o2_plus_o5_plus_40) + EX_LD_FP(LOAD(ldd, %o4-8, %f30), memcpy_retl_o2_plus_o5_plus_24) faligndata %f28, %f30, %f14 - EX_ST_FP(STORE(std, %f10, %o0+40), memcpy_retl_o2_plus_o5_plus_40) - EX_ST_FP(STORE(std, %f12, %o0+48), memcpy_retl_o2_plus_o5_plus_40) + EX_ST_FP(STORE(std, %f10, %o0+40), memcpy_retl_o2_plus_o5_plus_24) + EX_ST_FP(STORE(std, %f12, %o0+48), memcpy_retl_o2_plus_o5_plus_16) add %o0, 64, %o0 - EX_ST_FP(STORE(std, %f14, %o0-8), memcpy_retl_o2_plus_o5_plus_40) + EX_ST_FP(STORE(std, %f14, %o0-8), memcpy_retl_o2_plus_o5_plus_8) fsrc2 %f30, %f14 bgu,pt %xcc, .Lunalign_sloop prefetch [%o4 + (8 * BLOCK_SIZE)], 20 @@ -728,7 +728,7 @@ FUNC_NAME: add %o4, 8, %o4 faligndata %f0, %f2, %f16 subcc %o5, 8, %o5 - EX_ST_FP(STORE(std, %f16, %o0), memcpy_retl_o2_plus_o5) + EX_ST_FP(STORE(std, %f16, %o0), memcpy_retl_o2_plus_o5_plus_8) fsrc2 %f2, %f0 bgu,pt %xcc, .Lunalign_by8 add %o0, 8, %o0 @@ -772,7 +772,7 @@ FUNC_NAME: subcc %o5, 0x20, %o5 EX_ST(STORE(stx, %o3, %o0 + 0x00), memcpy_retl_o2_plus_o5_plus_32) EX_ST(STORE(stx, %g2, %o0 + 0x08), memcpy_retl_o2_plus_o5_plus_24) - EX_ST(STORE(stx, %g7, %o0 + 0x10), memcpy_retl_o2_plus_o5_plus_24) + EX_ST(STORE(stx, %g7, %o0 + 0x10), memcpy_retl_o2_plus_o5_plus_16) EX_ST(STORE(stx, %o4, %o0 + 0x18), memcpy_retl_o2_plus_o5_plus_8) bne,pt %xcc, 1b add %o0, 0x20, %o0 @@ -804,12 +804,12 @@ FUNC_NAME: brz,pt %o3, 2f sub %o2, %o3, %o2 =20 -1: EX_LD(LOAD(ldub, %o1 + 0x00, %g2), memcpy_retl_o2_plus_g1) +1: EX_LD(LOAD(ldub, %o1 + 0x00, %g2), memcpy_retl_o2_plus_o3) add %o1, 1, %o1 subcc %o3, 1, %o3 add %o0, 1, %o0 bne,pt %xcc, 1b - EX_ST(STORE(stb, %g2, %o0 - 0x01), memcpy_retl_o2_plus_g1_plus_1) + EX_ST(STORE(stb, %g2, %o0 - 0x01), memcpy_retl_o2_plus_o3_plus_1) 2: and %o1, 0x7, %o3 brz,pn %o3, .Lmedium_noprefetch_cp diff --git a/arch/sparc/lib/Memcpy_utils.S b/arch/sparc/lib/Memcpy_utils.S index 64fbac28b3db18864b0d067acaee0d7898feec7a..207343367bb2daa41a70398e20e= f271116423b38 100644 --- a/arch/sparc/lib/Memcpy_utils.S +++ b/arch/sparc/lib/Memcpy_utils.S @@ -137,6 +137,15 @@ ENTRY(memcpy_retl_o2_plus_63_8) ba,pt %xcc, __restore_asi add %o2, 8, %o0 ENDPROC(memcpy_retl_o2_plus_63_8) +ENTRY(memcpy_retl_o2_plus_o3) + ba,pt %xcc, __restore_asi + add %o2, %o3, %o0 +ENDPROC(memcpy_retl_o2_plus_o3) +ENTRY(memcpy_retl_o2_plus_o3_plus_1) + add %o3, 1, %o3 + ba,pt %xcc, __restore_asi + add %o2, %o3, %o0 +ENDPROC(memcpy_retl_o2_plus_o3_plus_1) ENTRY(memcpy_retl_o2_plus_o5) ba,pt %xcc, __restore_asi add %o2, %o5, %o0 --=20 2.50.1