From 8833066b122427710a9e14a888ce6cfa862332d3 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Tue, 31 Jul 2007 17:46:17 +0000
Subject: Updated to fedora-glibc-20070731T1624

---
 nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S | 55 +++++++++-------------
 1 file changed, 22 insertions(+), 33 deletions(-)

(limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S')

diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
index 6724ded762..502f1d442f 100644
--- a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
+++ b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
@@ -31,8 +31,23 @@
 #endif
 
 #define SYS_futex		202
-#define FUTEX_WAIT		0
-#define FUTEX_WAKE		1
+#ifndef FUTEX_WAIT
+# define FUTEX_WAIT		0
+# define FUTEX_WAKE		1
+#endif
+
+#ifndef LOAD_FUTEX_WAIT
+# if FUTEX_WAIT == 0
+#  define LOAD_FUTEX_WAIT(reg) \
+	xorl	reg, reg
+# else
+#  define LOAD_FUTEX_WAIT(reg) \
+	movl	$FUTEX_WAIT, reg
+# endif
+# define LOAD_FUTEX_WAKE(reg) \
+	movl	$FUTEX_WAKE, reg
+#endif
+
 
 /* For the calculation see asm/vsyscall.h.  */
 #define VSYSCALL_ADDR_vgettimeofday	0xffffffffff600000
@@ -52,11 +67,7 @@ __lll_mutex_lock_wait:
 	cfi_offset(%rdx, -24)
 	xorq	%r10, %r10	/* No timeout.  */
 	movl	$2, %edx
-#if FUTEX_WAIT == 0
-	xorl	%esi, %esi
-#else
-	movl	$FUTEX_WAIT, %esi
-#endif
+	LOAD_FUTEX_WAIT (%esi)
 
 	cmpl	%edx, %eax	/* NB:	 %edx == 2 */
 	jne	2f
@@ -151,11 +162,7 @@ __lll_mutex_timedlock_wait:
 	je	8f
 
 	movq	%rsp, %r10
-#if FUTEX_WAIT == 0
-	xorl	%esi, %esi
-#else
-	movl	$FUTEX_WAIT, %esi
-#endif
+	LOAD_FUTEX_WAIT (%esi)
 	movq	%r12, %rdi
 	movl	$SYS_futex, %eax
 	syscall
@@ -213,26 +220,6 @@ __lll_mutex_timedlock_wait:
 #endif
 
 
-#ifdef NOT_IN_libc
-	.globl	lll_unlock_wake_cb
-	.type	lll_unlock_wake_cb,@function
-	.hidden	lll_unlock_wake_cb
-	.align	16
-lll_unlock_wake_cb:
-	pushq	%rsi
-	pushq	%rdx
-
-	LOCK
-	addl	$1, (%rdi)
-	jng	1f
-
-	popq	%rdx
-	popq	%rsi
-	retq
-	.size	lll_unlock_wake_cb,.-lll_unlock_wake_cb
-#endif
-
-
 	.globl	__lll_mutex_unlock_wake
 	.type	__lll_mutex_unlock_wake,@function
 	.hidden	__lll_mutex_unlock_wake
@@ -247,7 +234,7 @@ __lll_mutex_unlock_wake:
 	cfi_offset(%rdx, -24)
 
 	movl	$0, (%rdi)
-	movl	$FUTEX_WAKE, %esi
+	LOAD_FUTEX_WAKE (%esi)
 	movl	$1, %edx	/* Wake one thread.  */
 	movl	$SYS_futex, %eax
 	syscall
@@ -311,6 +298,8 @@ __lll_timedwait_tid:
 	jz	4f
 
 	movq	%rsp, %r10
+	/* XXX The kernel so far uses global futex for the wakeup at
+	   all times.  */
 #if FUTEX_WAIT == 0
 	xorl	%esi, %esi
 #else
-- 
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