Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752212Ab3EaC4r (ORCPT ); Thu, 30 May 2013 22:56:47 -0400 Received: from cnbjrel02.sonyericsson.com ([219.141.167.166]:16976 "EHLO cnbjrel02.sonyericsson.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751559Ab3EaC4i (ORCPT ); Thu, 30 May 2013 22:56:38 -0400 From: "Wang, Yalin" To: "'Will Deacon'" CC: "'richard -rw- weinberger'" , "'linux-arch@vger.kernel.org'" , "'linux-kernel@vger.kernel.org'" , "'linux-arm-kernel@lists.infradead.org'" Date: Fri, 31 May 2013 10:56:31 +0800 Subject: RE: A bug about system call on ARM Thread-Topic: A bug about system call on ARM Thread-Index: Ac5dKq95WlHgHcz3TVeFrcOFSEcvowAf4A8A Message-ID: <35FD53F367049845BC99AC72306C23D1610991B86D@CNBJMBX05.corpusers.net> References: <35FD53F367049845BC99AC72306C23D1610991B85B@CNBJMBX05.corpusers.net> <35FD53F367049845BC99AC72306C23D1610991B85D@CNBJMBX05.corpusers.net> <35FD53F367049845BC99AC72306C23D1610991B85E@CNBJMBX05.corpusers.net> <20130529094826.GD13095@mudshark.cambridge.arm.com> <35FD53F367049845BC99AC72306C23D1610991B865@CNBJMBX05.corpusers.net> <35FD53F367049845BC99AC72306C23D1610991B866@CNBJMBX05.corpusers.net> <20130530090949.GC7483@mudshark.cambridge.arm.com> <20130530114112.GH7483@mudshark.cambridge.arm.com> In-Reply-To: <20130530114112.GH7483@mudshark.cambridge.arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/mixed; boundary="_002_35FD53F367049845BC99AC72306C23D1610991B86DCNBJMBX05corp_" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 24364 Lines: 398 --_002_35FD53F367049845BC99AC72306C23D1610991B86DCNBJMBX05corp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Will, Thanks for your patch , But I found I don't have ct_user_exit macro=20 In my arch/arm/kernel/entry-common.S=20 My kernel version is 3.4.0=20 I have add the file as attachment, Could you make a patch for this file ? Thank you ! -----Original Message----- From: Will Deacon [mailto:will.deacon@arm.com]=20 Sent: Thursday, May 30, 2013 7:41 PM To: Wang, Yalin Cc: 'richard -rw- weinberger'; 'linux-arch@vger.kernel.org'; 'linux-kernel@= vger.kernel.org'; 'linux-arm-kernel@lists.infradead.org' Subject: Re: A bug about system call on ARM On Thu, May 30, 2013 at 10:09:49AM +0100, Will Deacon wrote: > On Thu, May 30, 2013 at 02:41:42AM +0100, Wang, Yalin wrote: > > If you have some patch for this issue, I can do the test for it . >=20 > I'll have a look at cooking something which uses an exception table=20 > entry to rewind the PC and retry the system call. That's simpler than=20 > directly injecting a user page fault from the system call path. Ok, please can you try the following? Will --->8 diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.= S index bc5bc0a..855926e 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -361,6 +361,15 @@ ENTRY(vector_swi) str r8, [sp, #S_PSR] @ Save CPSR str r0, [sp, #S_OLD_R0] @ Save OLD_R0 zero_fp + enable_irq + ct_user_exit + +#ifdef CONFIG_ALIGNMENT_TRAP + ldr ip, __cr_alignment + ldr ip, [ip] + mcr p15, 0, ip, c1, c0 @ update control register +#endif + get_thread_info tsk =20 /* * Get the system call number. @@ -375,9 +384,9 @@ ENTRY(vector_swi) #ifdef CONFIG_ARM_THUMB tst r8, #PSR_T_BIT movne r10, #0 @ no thumb OABI emulation - ldreq r10, [lr, #-4] @ get SWI instruction + USER( ldreq r10, [lr, #-4] ) @ get SWI instruction #else - ldr r10, [lr, #-4] @ get SWI instruction + USER( ldr r10, [lr, #-4] ) @ get SWI instruction #endif #ifdef CONFIG_CPU_ENDIAN_BE8 rev r10, r10 @ little endian instruction @@ -392,22 +401,13 @@ ENTRY(vector_swi) /* Legacy ABI only, possibly thumb mode. */ tst r8, #PSR_T_BIT @ this is SPSR from save_user_regs addne scno, r7, #__NR_SYSCALL_BASE @ put OS number in - ldreq scno, [lr, #-4] + USER( ldreq scno, [lr, #-4] ) =20 #else /* Legacy ABI only. */ - ldr scno, [lr, #-4] @ get SWI instruction -#endif - -#ifdef CONFIG_ALIGNMENT_TRAP - ldr ip, __cr_alignment - ldr ip, [ip] - mcr p15, 0, ip, c1, c0 @ update control register + USER( ldr scno, [lr, #-4] ) @ get SWI instruction #endif - enable_irq - ct_user_exit =20 - get_thread_info tsk adr tbl, sys_call_table @ load syscall table pointer =20 #if defined(CONFIG_OABI_COMPAT) @@ -442,6 +442,18 @@ local_restart: eor r0, scno, #__NR_SYSCALL_BASE @ put OS number back bcs arm_syscall=09 b sys_ni_syscall @ not private func + +#if defined(CONFIG_OABI_COMPAT) || !defined(CONFIG_AEABI) + /* + * We may have faulted trying to load the SWI instruction due to + * concurrent page aging on another CPU. In this case, return + * back to the swi instruction and fault the page back. + */ +9001: + sub lr, lr, #4 + str lr, [sp, #S_PC] + b ret_fast_syscall +#endif ENDPROC(vector_swi) =20 /* --_002_35FD53F367049845BC99AC72306C23D1610991B86DCNBJMBX05corp_ Content-Type: application/octet-stream; name="entry-common.S" Content-Description: entry-common.S Content-Disposition: attachment; filename="entry-common.S"; size=15071; creation-date="Fri, 31 May 2013 02:56:05 GMT"; modification-date="Mon, 27 Aug 2012 04:18:05 GMT" Content-Transfer-Encoding: base64 LyoKICogIGxpbnV4L2FyY2gvYXJtL2tlcm5lbC9lbnRyeS1jb21tb24uUwogKgogKiAgQ29weXJp Z2h0IChDKSAyMDAwIFJ1c3NlbGwgS2luZwogKgogKiBUaGlzIHByb2dyYW0gaXMgZnJlZSBzb2Z0 d2FyZTsgeW91IGNhbiByZWRpc3RyaWJ1dGUgaXQgYW5kL29yIG1vZGlmeQogKiBpdCB1bmRlciB0 aGUgdGVybXMgb2YgdGhlIEdOVSBHZW5lcmFsIFB1YmxpYyBMaWNlbnNlIHZlcnNpb24gMiBhcwog KiBwdWJsaXNoZWQgYnkgdGhlIEZyZWUgU29mdHdhcmUgRm91bmRhdGlvbi4KICovCgojaW5jbHVk 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