summaryrefslogtreecommitdiff
path: root/libpthread/nptl/sysdeps/unix/sysv/linux/sh/sem_wait.S
blob: 00a125bc51137bcd1bcd02fdd41d2acafd289629 (plain)
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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
/* Copyright (C) 2003, 2004, 2007 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 <pthread-errnos.h>
#include <tcb-offsets.h>
#include <structsem.h>
#include <lowlevellock.h>
#include "lowlevel-atomic.h"


#if VALUE != 0
# error "code needs to be rewritten for VALUE != 0"
#endif

	.text

	.globl	__new_sem_wait
	.type	__new_sem_wait,@function
	.align	5
__new_sem_wait:
.LSTARTCODE:
	mov.l	r8, @-r15
.Lpush_r8:
	mov.l	r10, @-r15
.Lpush_r10:
	mov.l	r12, @-r15
.Lpush_r12:
	sts.l	pr, @-r15
.Lpush_pr:
	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
7:
	mov	#0, r0
9:
	lds.l	@r15+, pr
	mov.l	@r15+, r12
	mov.l	@r15+, r10
	rts
	 mov.l	@r15+, r8

.Lafter_ret:
1:
	INC (@(NWAITERS,r8),r2)

.LcleanupSTART:
6:
	mov.l	.Lenable0, r1
	bsrf	r1
	 nop
.Lenable0b:
	mov	r0, r10

	mov	r8, r4
#if FUTEX_WAIT == 0
	mov.l	@(PRIVATE,r8), r5
#else
	mov.l	@(PRIVATE,r8), r5
	mov	#FUTEX_WAIT, r0
	or	r0, r5
#endif
	mov	#0, r6
	mov	#0, r7
	mov	#SYS_futex, r3
	extu.b	r3, r3
	trapa	#0x14
	SYSCALL_INST_PAD

	mov.l	.Ldisable0, r1
	mov	r10, r4
	bsrf	r1
	 mov	r0, r10
.Ldisable0b:
	mov	r10, r0
.LcleanupEND:

	tst	r0, r0
	bt	3f
	cmp/eq	#-EWOULDBLOCK, r0
	bf	4f

3:
	mov.l	@r8, r0
5:
	tst	r0, r0
	bt	6b

	mov	r0, r3
	mov	r0, r4
	add	#-1, r3
	CMPXCHG (r4, @r8, r3, r2)
	bf/s	5b
	 mov	r2, r0

	DEC (@(NWAITERS,r8), r2)
	bra	7b
	 nop

4:
	neg	r0, r0
	mov	r0, r4
	DEC (@(NWAITERS,r8), r2)
	mov	r4, r8
	mova	.Lgot0, r0
	mov.l	.Lgot0, r12
	add	r0, r12

#if USE___THREAD
	mov.l	.Lerrno0, r0
	stc	gbr, r1
	mov.l	@(r0, r12), r0
	bra	.Lexit
	 add	r1, r0
	.align	2
.Lerrno0:
	.long	errno@GOTTPOFF
.Lexit:
#else
	mov.l	.Lerrloc0, r1
	bsrf	r1
	 nop
.Lerrloc0b:
#endif
	mov.l	r8, @r0
	bra	9b
	 mov	#-1, r0

	.align	2
.Lgot0:
	.long	_GLOBAL_OFFSET_TABLE_
#if !USE___THREAD
.Lerrloc0:
	.long	__errno_location@PLT-(.Lerrloc0b-.)
#endif
.Lenable0:
	.long	__pthread_enable_asynccancel-.Lenable0b
.Ldisable0:
	.long	__pthread_disable_asynccancel-.Ldisable0b
	.size	__new_sem_wait,.-__new_sem_wait
	weak_alias(__new_sem_wait, sem_wait)


	.type	sem_wait_cleanup,@function
sem_wait_cleanup:
 	DEC (@(NWAITERS,r8), r2)
.LcallUR:
	mov.l	.Lresume, r1
#ifdef __PIC__
	add	r12, r1
#endif
	jsr	@r1
	 nop
	sleep

	.align	2
.Lresume:
#ifdef __PIC__
	.long	_Unwind_Resume@GOTOFF
#else
	.long	_Unwind_Resume
#endif
.LENDCODE:
	.size	sem_wait_cleanup,.-sem_wait_cleanup


	.section .gcc_except_table,"a",@progbits
.LexceptSTART:
	.byte	0xff				! @LPStart format (omit)
	.byte	0xff				! @TType format (omit)
	.byte	0x01				! call-site format
						! DW_EH_PE_uleb128
	.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
	.uleb128 .LcleanupSTART-.LSTARTCODE
	.uleb128 .LcleanupEND-.LcleanupSTART
	.uleb128 sem_wait_cleanup-.LSTARTCODE
	.uleb128  0
	.uleb128 .LcallUR-.LSTARTCODE
	.uleb128 .LENDCODE-.LcallUR
	.uleb128 0
	.uleb128  0
.Lcstend:


	.section .eh_frame,"a",@progbits
.LSTARTFRAME:
	.ualong	.LENDCIE-.LSTARTCIE		! Length of the CIE.
.LSTARTCIE:
	.ualong	0				! CIE ID.
	.byte	1				! Version number.
#ifdef SHARED
	.string	"zPLR"				! NUL-terminated augmentation
						! string.
#else
	.string	"zPL"				! NUL-terminated augmentation
						! string.
#endif
	.uleb128 1				! Code alignment factor.
	.sleb128 -4				! Data alignment factor.
	.byte	0x11				! Return address register
						! column.
#ifdef SHARED
	.uleb128 7				! Augmentation value length.
	.byte	0x9b				! Personality: DW_EH_PE_pcrel
						! + DW_EH_PE_sdata4
						! + DW_EH_PE_indirect
	.ualong	DW.ref.__gcc_personality_v0-.
	.byte	0x1b				! LSDA Encoding: DW_EH_PE_pcrel
						! + DW_EH_PE_sdata4.
	.byte	0x1b				! FDE Encoding: DW_EH_PE_pcrel
						! + DW_EH_PE_sdata4.
#else
	.uleb128 6				! Augmentation value length.
	.byte	0x0				! Personality: absolute
	.ualong	__gcc_personality_v0
	.byte	0x0				! LSDA Encoding: absolute
#endif
	.byte 0x0c				! DW_CFA_def_cfa
	.uleb128 0xf
	.uleb128 0
	.align 4
.LENDCIE:

	.ualong	.LENDFDE-.LSTARTFDE		! Length of the FDE.
.LSTARTFDE:
	.ualong	.LSTARTFDE-.LSTARTFRAME		! CIE pointer.
#ifdef SHARED
	.ualong	.LSTARTCODE-.			! PC-relative start address
						! of the code.
#else
	.ualong	.LSTARTCODE			! Start address of the code.
#endif
	.ualong	.LENDCODE-.LSTARTCODE		! Length of the code.
	.uleb128 4				! Augmentation size
#ifdef SHARED
	.ualong	.LexceptSTART-.
#else
	.ualong	.LexceptSTART
#endif

	.byte	4				! DW_CFA_advance_loc4
	.ualong	.Lpush_r8-.LSTARTCODE
	.byte	14				! DW_CFA_def_cfa_offset
	.uleb128 4
	.byte   0x88				! DW_CFA_offset r8
        .uleb128 1
	.byte	4				! DW_CFA_advance_loc4
	.ualong	.Lpush_r10-.Lpush_r8
	.byte	14				! DW_CFA_def_cfa_offset
	.uleb128 8
	.byte   0x8a				! DW_CFA_offset r10
        .uleb128 2
	.byte	4				! DW_CFA_advance_loc4
	.ualong	.Lpush_r12-.Lpush_r10
	.byte	14				! DW_CFA_def_cfa_offset
	.uleb128 12
	.byte   0x8c				! DW_CFA_offset r12
        .uleb128 3
	.byte	4				! DW_CFA_advance_loc4
	.ualong	.Lpush_pr-.Lpush_r12
	.byte	14				! DW_CFA_def_cfa_offset
	.uleb128 16
	.byte   0x91				! DW_CFA_offset pr
        .uleb128 4
	.align	4
.LENDFDE:


#ifdef SHARED
	.hidden	DW.ref.__gcc_personality_v0
	.weak	DW.ref.__gcc_personality_v0
	.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
	.align	4
	.type	DW.ref.__gcc_personality_v0, @object
	.size	DW.ref.__gcc_personality_v0, 4
DW.ref.__gcc_personality_v0:
	.long	__gcc_personality_v0
#endif