about summary refs log tree commit diff
path: root/nptl/sysdeps/unix/sysv/linux/sh/sem_trywait.S
blob: 0091e53e7c8fa47a2f470faa560d44da487004ac (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/* Copyright (C) 2003 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   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 <shlib-compat.h>
#include <pthread-errnos.h>
#include "lowlevel-atomic.h"


	.text

	.globl	__new_sem_trywait
	.type	__new_sem_trywait,@function
	.align	5
__new_sem_trywait:
	mov.l	r12, @-r15
	mov.l	r8, @-r15
	sts.l	pr, @-r15
	mov	r4, r8
	mov.l	@r8, r0
2:
	tst	r0, r0
	bt	1f

	mov	r0, r3
	mov	r0, r4
	add	#-1, r3
	CMPXCHG (r4, @r8, r3, r2)
	bf/s	2b
	 mov	r2, r0

	lds.l	@r15+, pr
	mov.l	@r15+, r8
	mov.l	@r15+, r12
	rts
	 mov	#0, r0

1:
	mov	#EAGAIN, r8
	mova	.Lgot1, r0
	mov.l	.Lgot1, r12
	add	r0, r12

#if USE___THREAD
	mov.l	.Lerrno1, r0
	stc	gbr, r1
	mov.l	@(r0, r12), r0
	add	r1, r0
	mov.l	r8, @r0
#else
	mov.l	.Lerrloc1, r1
	bsrf	r1
	 nop
.Lerrloc1b:
	mov.l	r8, @r0
#endif
	lds.l	@r15+, pr
	mov.l	@r15+, r8
	mov.l	@r15+, r12
	rts
	 mov	#-1, r0

	.align	2
.Lgot1:
	.long	_GLOBAL_OFFSET_TABLE_
#if USE___THREAD
.Lerrno1:
	.long	errno@GOTTPOFF
#else
.Lerrloc1:
	.long	__errno_location@PLT-(.Lerrloc1b+2-.)
#endif
	.size	__new_sem_trywait,.-__new_sem_trywait
	versioned_symbol(libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1)