2.5-18.1

1 files changed, 227 insertions, 0 deletions

diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelrobustlock.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelrobustlock.S
new file mode 100644
index 0000000000..73d8bc4ccc
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelrobustlock.S
@@ -0,0 +1,227 @@
+/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#include <pthread-errnos.h>
+#include <lowlevelrobustlock.h>
+
+	.text
+
+#ifndef LOCK
+# ifdef UP
+#  define LOCK
+# else
+#  define LOCK lock
+# endif
+#endif
+
+#define SYS_gettimeofday	__NR_gettimeofday
+#define SYS_futex		240
+#define FUTEX_WAIT		0
+#define FUTEX_WAKE		1
+#define FUTEX_WAITERS		0x80000000
+#define FUTEX_OWNER_DIED	0x40000000
+
+
+	.globl	__lll_robust_mutex_lock_wait
+	.type	__lll_robust_mutex_lock_wait,@function
+	.hidden	__lll_robust_mutex_lock_wait
+	.align	16
+__lll_robust_mutex_lock_wait:
+	cfi_startproc
+	pushl	%edx
+	cfi_adjust_cfa_offset(4)
+	pushl	%ebx
+	cfi_adjust_cfa_offset(4)
+	pushl	%esi
+	cfi_adjust_cfa_offset(4)
+	cfi_offset(%edx, -8)
+	cfi_offset(%ebx, -12)
+	cfi_offset(%esi, -16)
+
+	movl	%ecx, %ebx
+	xorl	%esi, %esi	/* No timeout.  */
+	xorl	%ecx, %ecx	/* movl $FUTEX_WAIT, %ecx */
+
+4:	movl	%eax, %edx
+	orl	$FUTEX_WAITERS, %edx
+
+	testl	$FUTEX_OWNER_DIED, %eax
+	jnz	3f
+
+	cmpl	%edx, %eax	/* NB:	 %edx == 2 */
+	je	1f
+
+	LOCK
+	cmpxchgl %edx, (%ebx)
+	jnz	2f
+
+1:	movl	$SYS_futex, %eax
+	ENTER_KERNEL
+
+	movl	(%ebx), %eax
+
+2:	test	%eax, %eax
+	jne	4b
+
+	movl	%gs:TID, %edx
+	orl	$FUTEX_WAITERS, %edx
+	LOCK
+	cmpxchgl %edx, (%ebx)
+	jnz	4b
+	/* NB:	 %eax == 0 */
+
+3:	popl	%esi
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%esi)
+	popl	%ebx
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%ebx)
+	popl	%edx
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%edx)
+	ret
+	cfi_endproc
+	.size	__lll_robust_mutex_lock_wait,.-__lll_robust_mutex_lock_wait
+
+
+	.globl	__lll_robust_mutex_timedlock_wait
+	.type	__lll_robust_mutex_timedlock_wait,@function
+	.hidden	__lll_robust_mutex_timedlock_wait
+	.align	16
+__lll_robust_mutex_timedlock_wait:
+	cfi_startproc
+	/* Check for a valid timeout value.  */
+	cmpl	$1000000000, 4(%edx)
+	jae	3f
+
+	pushl	%edi
+	cfi_adjust_cfa_offset(4)
+	pushl	%esi
+	cfi_adjust_cfa_offset(4)
+	pushl	%ebx
+	cfi_adjust_cfa_offset(4)
+	pushl	%ebp
+	cfi_adjust_cfa_offset(4)
+	cfi_offset(%edi, -8)
+	cfi_offset(%esi, -12)
+	cfi_offset(%ebx, -16)
+	cfi_offset(%ebp, -20)
+
+	/* Stack frame for the timespec and timeval structs.  */
+	subl	$12, %esp
+	cfi_adjust_cfa_offset(12)
+
+	movl	%ecx, %ebp
+	movl	%edx, %edi
+
+1:	movl	%eax, 8(%esp)
+
+	/* Get current time.  */
+	movl	%esp, %ebx
+	xorl	%ecx, %ecx
+	movl	$SYS_gettimeofday, %eax
+	ENTER_KERNEL
+
+	/* Compute relative timeout.  */
+	movl	4(%esp), %eax
+	movl	$1000, %edx
+	mul	%edx		/* Milli seconds to nano seconds.  */
+	movl	(%edi), %ecx
+	movl	4(%edi), %edx
+	subl	(%esp), %ecx
+	subl	%eax, %edx
+	jns	4f
+	addl	$1000000000, %edx
+	subl	$1, %ecx
+4:	testl	%ecx, %ecx
+	js	8f		/* Time is already up.  */
+
+	/* Store relative timeout.  */
+	movl	%ecx, (%esp)
+	movl	%edx, 4(%esp)
+
+	movl	%ebp, %ebx
+
+	movl	8(%esp), %edx
+	movl	%edx, %eax
+	orl	$FUTEX_WAITERS, %edx
+
+	testl	$FUTEX_OWNER_DIED, %eax
+	jnz	6f
+
+	cmpl	%eax, %edx
+	je	2f
+
+	LOCK
+	cmpxchgl %edx, (%ebx)
+	movl	$0, %ecx	/* Must use mov to avoid changing cc.  */
+	jnz	5f
+
+2:
+	/* Futex call.  */
+	movl	%esp, %esi
+	xorl	%ecx, %ecx	/* movl $FUTEX_WAIT, %ecx */
+	movl	$SYS_futex, %eax
+	ENTER_KERNEL
+	movl	%eax, %ecx
+
+	movl	(%ebx), %eax
+
+5:	testl	%eax, %eax
+	jne	7f
+
+	movl	%gs:TID, %edx
+	orl	$FUTEX_WAITERS, %edx
+	LOCK
+	cmpxchgl %edx, (%ebx)
+	jnz	7f
+
+6:	addl	$12, %esp
+	cfi_adjust_cfa_offset(-12)
+	popl	%ebp
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%ebp)
+	popl	%ebx
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%ebx)
+	popl	%esi
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%esi)
+	popl	%edi
+	cfi_adjust_cfa_offset(-4)
+	cfi_restore(%edi)
+	ret
+
+3:	movl	$EINVAL, %eax
+	ret
+
+	cfi_adjust_cfa_offset(28)
+	cfi_offset(%edi, -8)
+	cfi_offset(%esi, -12)
+	cfi_offset(%ebx, -16)
+	cfi_offset(%ebp, -20)
+	/* Check whether the time expired.  */
+7:	cmpl	$-ETIMEDOUT, %ecx
+	jne	1b
+
+8:	movl	$ETIMEDOUT, %eax
+	jmp	6b
+	cfi_endproc
+	.size	__lll_robust_mutex_timedlock_wait,.-__lll_robust_mutex_timedlock_wait