From 32c6c342b6bc10396785a4542c22f6f95deca684 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Sat, 18 Jul 2009 21:53:26 -0700
Subject: Extend x86-64 pthread_rwlock_timedrdlock to use futex syscall with
 absolute timeout.

---
 nptl/ChangeLog                                     |  2 +
 .../sysv/linux/x86_64/pthread_rwlock_timedrdlock.S | 73 ++++++++++++++++------
 2 files changed, 57 insertions(+), 18 deletions(-)

(limited to 'nptl')

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 719d781d3a..44f9846365 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -3,6 +3,8 @@
 	* sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedwrlock.S
 	(pthread_rwlock_timedwrlock): If possible use FUTEX_WAIT_BITSET to
 	directly use absolute timeout.
+	* sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S
+	(pthread_rwlock_timedrdlock): Likewise.
 
 	* tst-cond11.c (run_test): Add test to check that the timeout is
 	long enough.
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S
index 366c96fc36..23b218af34 100644
--- a/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S
+++ b/nptl/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+/* Copyright (C) 2002-2005, 2007, 2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
 
@@ -36,16 +36,21 @@ pthread_rwlock_timedrdlock:
 	cfi_startproc
 	pushq	%r12
 	cfi_adjust_cfa_offset(8)
+	cfi_rel_offset(%r12, 0)
 	pushq	%r13
 	cfi_adjust_cfa_offset(8)
+	cfi_rel_offset(%r13, 0)
+#ifdef __ASSUME_FUTEX_CLOCK_REALTIME
+# define VALREG	%edx
+#else
 	pushq	%r14
 	cfi_adjust_cfa_offset(8)
-	cfi_offset(%r12, -16)
-	cfi_offset(%r13, -24)
-	cfi_offset(%r14, -32)
+	cfi_rel_offset(%r14, 0)
 
 	subq	$16, %rsp
 	cfi_adjust_cfa_offset(16)
+# define VALREG %r14d
+#endif
 
 	movq	%rdi, %r12
 	movq	%rsi, %r13
@@ -76,7 +81,7 @@ pthread_rwlock_timedrdlock:
 	incl	READERS_QUEUED(%r12)
 	je	4f
 
-	movl	READERS_WAKEUP(%r12), %r14d
+	movl	READERS_WAKEUP(%r12), VALREG
 
 	/* Unlock.  */
 	LOCK
@@ -87,8 +92,33 @@ pthread_rwlock_timedrdlock:
 #endif
 	jne	10f
 
+11:
+#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
+#  ifdef PIC
+	cmpl	$0, __have_futex_clock_realtime(%rip)
+#  else
+	cmpl	$0, __have_futex_clock_realtime
+#  endif
+	je	.Lreltmo
+#endif
+
+	movl	$FUTEX_PRIVATE_FLAG|FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, %esi
+	xorl	PSHARED(%r12), %esi
+	movq	%r13, %r10
+	movl	$0xffffffff, %r9d
+#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
+	movl	%r14d, %edx
+#endif
+21:	leaq	READERS_WAKEUP(%r12), %rdi
+	movl	$SYS_futex, %eax
+	syscall
+	movq	%rax, %rdx
+
+#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
+	.subsection 2
+.Lreltmo:
 	/* Get current time.  */
-11:	movq	%rsp, %rdi
+	movq	%rsp, %rdi
 	xorl	%esi, %esi
 	movq	$VSYSCALL_ADDR_vgettimeofday, %rax
 	callq	*%rax
@@ -111,27 +141,26 @@ pthread_rwlock_timedrdlock:
 	movq	%rcx, (%rsp)	/* Store relative timeout.  */
 	movq	%rdi, 8(%rsp)
 
-#ifdef __ASSUME_PRIVATE_FUTEX
+# ifdef __ASSUME_PRIVATE_FUTEX
 	movl	$FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi
 	xorl	PSHARED(%r12), %esi
-#else
-# if FUTEX_WAIT == 0
-	movl	PSHARED(%r12), %esi
 # else
+#  if FUTEX_WAIT == 0
+	movl	PSHARED(%r12), %esi
+#  else
 	movl	$FUTEX_WAIT, %esi
 	orl	PSHARED(%r12), %esi
-# endif
+#  endif
 	xorl	%fs:PRIVATE_FUTEX, %esi
-#endif
+# endif
 	movq	%rsp, %r10
 	movl	%r14d, %edx
-	leaq	READERS_WAKEUP(%r12), %rdi
-	movl	$SYS_futex, %eax
-	syscall
-	movq	%rax, %rdx
-17:
 
-	/* Reget the lock.  */
+	jmp	21b
+	.previous
+#endif
+
+17:	/* Reget the lock.  */
 	movl	$1, %esi
 	xorl	%eax, %eax
 	LOCK
@@ -163,11 +192,13 @@ pthread_rwlock_timedrdlock:
 
 7:	movq	%rdx, %rax
 
+#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
 	addq	$16, %rsp
 	cfi_adjust_cfa_offset(-16)
 	popq	%r14
 	cfi_adjust_cfa_offset(-8)
 	cfi_restore(%r14)
+#endif
 	popq	%r13
 	cfi_adjust_cfa_offset(-8)
 	cfi_restore(%r13)
@@ -176,10 +207,16 @@ pthread_rwlock_timedrdlock:
 	cfi_restore(%r12)
 	retq
 
+#ifdef __ASSUME_PRIVATE_FUTEX
+	cfi_adjust_cfa_offset(16)
+	cfi_rel_offset(%r12, 8)
+	cfi_rel_offset(%r13, 0)
+#else
 	cfi_adjust_cfa_offset(40)
 	cfi_offset(%r12, -16)
 	cfi_offset(%r13, -24)
 	cfi_offset(%r14, -32)
+#endif
 1:	movl	PSHARED(%rdi), %esi
 #if MUTEX != 0
 	addq	$MUTEX, %rdi
-- 
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