From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932453AbWBOW7T (ORCPT ); Wed, 15 Feb 2006 17:59:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932463AbWBOW7T (ORCPT ); Wed, 15 Feb 2006 17:59:19 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:65260 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S932453AbWBOW6u (ORCPT ); Wed, 15 Feb 2006 17:58:50 -0500 Date: Wed, 15 Feb 2006 23:57:09 +0100 From: Ingo Molnar To: linux-kernel@vger.kernel.org Cc: Ulrich Drepper , Thomas Gleixner , Arjan van de Ven , Andrew Morton Subject: [patch 4/5] lightweight robust futexes: i386 Message-ID: <20060215225709.GE5599@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 i386: 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/i386/kernel/syscall_table.S | 2 ++ include/asm-i386/futex.h | 20 +++++++++++++++++++- include/asm-i386/unistd.h | 4 +++- 3 files changed, 24 insertions(+), 2 deletions(-) Index: linux-robust-list.q/arch/i386/kernel/syscall_table.S =================================================================== --- linux-robust-list.q.orig/arch/i386/kernel/syscall_table.S +++ linux-robust-list.q/arch/i386/kernel/syscall_table.S @@ -310,3 +310,5 @@ ENTRY(sys_call_table) .long sys_pselect6 .long sys_ppoll .long sys_unshare /* 310 */ + .long sys_set_robust_list + .long sys_get_robust_list Index: linux-robust-list.q/include/asm-i386/futex.h =================================================================== --- linux-robust-list.q.orig/include/asm-i386/futex.h +++ linux-robust-list.q/include/asm-i386/futex.h @@ -107,7 +107,25 @@ 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 %1, %2 \n" + + "2: .section .fixup, \"ax\" \n" + "3: mov %3, %0 \n" + " jmp 2b \n" + " .previous \n" + + " .section __ex_table, \"a\" \n" + " .align 8 \n" + " .long 1b,3b \n" + " .previous \n" + + : "=&a" (oldval), "=&r" (newval), "=m" (*uaddr) + : "i" (-EFAULT) + : "memory" + ); + + return oldval; } #endif Index: linux-robust-list.q/include/asm-i386/unistd.h =================================================================== --- linux-robust-list.q.orig/include/asm-i386/unistd.h +++ linux-robust-list.q/include/asm-i386/unistd.h @@ -316,8 +316,10 @@ #define __NR_pselect6 308 #define __NR_ppoll 309 #define __NR_unshare 310 +#define __NR_set_robust_list 311 +#define __NR_get_robust_list 312 -#define NR_syscalls 311 +#define NR_syscalls 313 /* * user-visible error numbers are in the range -1 - -128: see