From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932283AbWBPJoj (ORCPT ); Thu, 16 Feb 2006 04:44:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932526AbWBPJoc (ORCPT ); Thu, 16 Feb 2006 04:44:32 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:24258 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S932524AbWBPJoX (ORCPT ); Thu, 16 Feb 2006 04:44:23 -0500 Date: Thu, 16 Feb 2006 10:42:42 +0100 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Ulrich Drepper , Thomas Gleixner , Arjan van de Ven , Andrew Morton Subject: [patch 6/6] lightweight robust futexes: x86_64 Message-ID: <20060216094242.GG29716@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: -2.2 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.2 required=5.9 tests=ALL_TRUSTED,AWL autolearn=no SpamAssassin version=3.0.3 -2.8 ALL_TRUSTED Did not pass through any untrusted hosts 0.6 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org x86_64: add the futex_atomic_cmpxchg_inuser() assembly implementation, and wire up the new syscalls. Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Signed-off-by: Arjan van de Ven Acked-by: Ulrich Drepper ---- arch/x86_64/ia32/ia32entry.S | 2 ++ include/asm-x86_64/futex.h | 20 +++++++++++++++++++- include/asm-x86_64/unistd.h | 6 +++++- 3 files changed, 26 insertions(+), 2 deletions(-) Index: linux-robust-list.q/arch/x86_64/ia32/ia32entry.S =================================================================== --- linux-robust-list.q.orig/arch/x86_64/ia32/ia32entry.S +++ linux-robust-list.q/arch/x86_64/ia32/ia32entry.S @@ -688,6 +688,8 @@ ia32_sys_call_table: .quad sys_ni_syscall /* pselect6 for now */ .quad sys_ni_syscall /* ppoll for now */ .quad sys_unshare /* 310 */ + .quad compat_sys_set_robust_list + .quad compat_sys_get_robust_list ia32_syscall_end: .rept IA32_NR_syscalls-(ia32_syscall_end-ia32_sys_call_table)/8 .quad ni_syscall Index: linux-robust-list.q/include/asm-x86_64/futex.h =================================================================== --- linux-robust-list.q.orig/include/asm-x86_64/futex.h +++ linux-robust-list.q/include/asm-x86_64/futex.h @@ -97,7 +97,25 @@ futex_atomic_op_inuser (int encoded_op, static inline int futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval) { - return -ENOSYS; + __asm__ __volatile__( + "1: " LOCK_PREFIX "cmpxchgl %3, %1 \n" + + "2: .section .fixup, \"ax\" \n" + "3: mov %2, %0 \n" + " jmp 2b \n" + " .previous \n" + + " .section __ex_table, \"a\" \n" + " .align 8 \n" + " .quad 1b,3b \n" + " .previous \n" + + : "=a" (oldval), "=m" (*uaddr) + : "i" (-EFAULT), "r" (newval), "0" (oldval) + : "memory" + ); + + return oldval; } #endif Index: linux-robust-list.q/include/asm-x86_64/unistd.h =================================================================== --- linux-robust-list.q.orig/include/asm-x86_64/unistd.h +++ linux-robust-list.q/include/asm-x86_64/unistd.h @@ -605,8 +605,12 @@ __SYSCALL(__NR_pselect6, sys_ni_syscall) __SYSCALL(__NR_ppoll, sys_ni_syscall) /* for now */ #define __NR_unshare 272 __SYSCALL(__NR_unshare, sys_unshare) +#define __NR_set_robust_list 273 +__SYSCALL(__NR_set_robust_list, sys_set_robust_list) +#define __NR_get_robust_list 274 +__SYSCALL(__NR_get_robust_list, sys_get_robust_list) -#define __NR_syscall_max __NR_unshare +#define __NR_syscall_max __NR_get_robust_list #ifndef __NO_STUBS