about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/alpha/swapcontext.S
blob: 691ee3fe4ea31b4a3adbc95a721ea9a1415289b4 (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
/* Save current context and install the given one.
   Copyright (C) 2004-2019 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
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <ucontext-offsets.h>

ENTRY(__swapcontext)

#ifdef PROF
	ldgp	$29, 0($27)
	.set noat
	lda     AT, _mcount
	jsr     AT, (AT), _mcount
	.set at
	.prologue 1
#elif defined PIC
	.prologue 0
#else
	ldgp	$29, 0($27)
	.prologue 1
#endif

#ifdef PIC
	unop
	bsr	$0, __getcontext_x	!samegp
	mov	$17, $16
	br	$31, __setcontext	!samegp
#else
	jsr	$0, __getcontext_x
	mov	$17, $16
	jmp	$31, __setcontext
#endif

END(__swapcontext)
weak_alias (__swapcontext, swapcontext)