summaryrefslogtreecommitdiff
path: root/ports/sysdeps/unix/sysv/linux/alpha/select.S
blob: 9a141398dfbe0abef620f5db1a6020acb93cf2c4 (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
/* Copyright (C) 1998,2002,2003,2006,2012 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, see
   <http://www.gnu.org/licenses/>.  */

#include <sysdep-cancel.h>
#define _ERRNO_H        1
#include <bits/errno.h>
#include <kernel-features.h>

.text

#if defined PIC && defined DO_VERSIONING
#define SELECT	__select_tv64
#else
#define SELECT	__select
#endif

#if defined __ASSUME_TIMEVAL64
PSEUDO(SELECT, select, 5)
	ret
PSEUDO_END(SELECT)
#else
/* The problem here is that initially we made struct timeval compatible with
   OSF/1, using int32.  But we defined time_t with uint64, and later found
   that POSIX requires tv_sec to be time_t.

   So now we have to do compatibility stuff.  */

/* The variable is shared between all wrappers around signal handling
   functions which have RT equivalents.  */
.comm __libc_missing_axp_tv64, 4

LEAF(SELECT, 64)
	ldgp	gp, 0(pv)
	subq	sp, 64, sp
#ifdef PROF
	.set noat
	lda	AT, _mcount
	jsr	AT, (AT), _mcount
	.set at
#endif
	stq	ra, 40(sp)
	.mask	0x4000000, 40-64
	.prologue 1

#ifdef CENABLE
	SINGLE_THREAD_P (t1)
#else
	ldl	t0, __libc_missing_axp_tv64
#endif

	/* Save timeout early, since we'll need to recover this after
	   the system call.  */
	stq	a4, 48(sp)

#ifdef CENABLE
	bne	t1, $do_cancel
#endif

	bne	t0, $do32

	/* Save arguments in case we do need to fall back.  */
	stq	a0, 8(sp)
	stq	a1, 16(sp)
	stq	a2, 24(sp)
	stq	a3, 32(sp)

	ldi	v0, SYS_ify(select)
	callsys
	bne	a3, $err64

	/* Everything ok.  */
	addq	sp, 64, sp
	ret

	/* If we didn't get ENOSYS, it is a real error.  */
	.align 3
$err64:	cmpeq	v0, ENOSYS, t0
	beq	t0, $error
	stl	t0, __libc_missing_axp_tv64

	/* Recover the saved arguments.  */
	ldq	a4, 48(sp)
	ldq	a3, 32(sp)
	ldq	a2, 24(sp)
	ldq	a1, 16(sp)
	ldq	a0, 8(sp)

	.align 3
$do32:
	/* If the timeout argument is present bounce to the smaller fmt.  */
	beq	a4, 1f
	ldq	t0, 0(a4)
	ldq	t1, 8(a4)
	stl	t0, 0(sp)
	stl	t1, 4(sp)
	mov	sp, a4

1:	ldi	v0, SYS_ify(osf_select)
	callsys
	bne	a3, $error

	/* ... and bounce the remaining timeout back.  */
	ldq	a4, 48(sp)
	beq	a4, 2f
	ldl	t0, 0(sp)
	ldl	t1, 4(sp)
	stq	t0, 0(a4)
	stq	t1, 8(a4)

2:	addq	sp, 64, sp
	ret

#ifdef CENABLE
	.align	3
$do_cancel:
	/* Save arguments.  */
	stq	a0, 8(sp)
	stq	a1, 16(sp)
	stq	a2, 24(sp)
	stq	a3, 32(sp)

	CENABLE
	mov	v0, ra

	ldl	t0, __libc_missing_axp_tv64
	bne	t0, $do_cancel32

	/* Recover the saved arguments.  */
	ldq	a4, 48(sp)
	ldq	a3, 32(sp)
	ldq	a2, 24(sp)
	ldq	a1, 16(sp)
	ldq	a0, 8(sp)

	ldi	v0, SYS_ify(select)
	callsys

	mov	ra, a0
	bne	a3, $cancel_err64

	stq	v0, 8(sp)
	CDISABLE
	ldq	v0, 8(sp)
	ldq	ra, 40(sp)

	/* Everything ok.  */
	addq	sp, 64, sp
	ret

	/* If we didn't get ENOSYS, it is a real error.  */
	.align 3
$cancel_err64:
	cmpeq	v0, ENOSYS, t0
	beq	t0, $cancel_error
	stl	t0, __libc_missing_axp_tv64

	/* Recover the saved arguments.  */
	.align 3
$do_cancel32:
	ldq	a4, 48(sp)
	ldq	a3, 32(sp)
	ldq	a2, 24(sp)
	ldq	a1, 16(sp)
	ldq	a0, 8(sp)

	/* If the timeout argument is present bounce to the smaller fmt.  */
	beq	a4, 1f
	ldq	t0, 0(a4)
	ldq	t1, 8(a4)
	stl	t0, 0(sp)
	stl	t1, 4(sp)
	mov	sp, a4

1:	ldi	v0, SYS_ify(osf_select)
	callsys

	mov	ra, a0
	bne	a3, $cancel_error

	/* ... and bounce the remaining timeout back.  */
	ldq	a4, 48(sp)
	beq	a4, 2f
	ldl	t0, 0(sp)
	ldl	t1, 4(sp)
	stq	t0, 0(a4)
	stq	t1, 8(a4)

2:	stq	v0, 8(sp)
	CDISABLE
	ldq	v0, 8(sp)
	ldq	ra, 40(sp)

	addq	sp, 64, sp
	ret

	.align 3
$cancel_error:
	stq	v0, 8(sp)
	CDISABLE
	ldq	v0, 8(sp)
	ldq	ra, 40(sp)
#endif

	.align 3
$error:
	addq	sp, 64, sp
	SYSCALL_ERROR_HANDLER

END(SELECT)
#endif /* __ASSUME_TIMEVAL64 */

#if defined PIC && defined DO_VERSIONING
default_symbol_version (__select_tv64, __select, GLIBC_2.1)

/* It seems to me to be a misfeature of the assembler that we can only
   have one version-alias per symbol.  So create an alias ourselves.
   The 'p' is for 'public'.  *Shrug*  */
strong_alias (__select_tv64, __select_tv64p)
default_symbol_version (__select_tv64p, select, GLIBC_2.1)
libc_hidden_ver (__select_tv64, __select)
strong_alias (__select_tv64, __libc_select)
#else
strong_alias (__select, __libc_select)
weak_alias (__select, select)
libc_hidden_def (__select)
#endif