From: Ingo Molnar <mingo@elte.hu>
To: linux-kernel@vger.kernel.org
Cc: Ulrich Drepper <drepper@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Arjan van de Ven <arjan@infradead.org>,
Andrew Morton <akpm@osdl.org>
Subject: [patch 5/6] lightweight robust futexes: i386
Date: Thu, 16 Feb 2006 10:42:34 +0100 [thread overview]
Message-ID: <20060216094234.GF29716@elte.hu> (raw)
i386: add the futex_atomic_cmpxchg_inuser() assembly implementation, and
wire up the new syscalls.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Acked-by: Ulrich Drepper <drepper@redhat.com>
----
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 %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"
+ " .long 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-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
next reply other threads:[~2006-02-16 9:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-16 9:42 Ingo Molnar [this message]
2006-02-21 8:47 Ingo Molnar
2006-02-21 15:54 Chuck Ebbert
2006-02-21 16:38 ` Ulrich Drepper
2006-02-22 21:45 Chuck Ebbert
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