1/* Save current context and install the given one.
2 Copyright (C) 2004-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#include <ucontext-offsets.h>
21
22ENTRY(__swapcontext)
23
24#ifdef PROF
25 ldgp $29, 0($27)
26 .set noat
27 lda AT, _mcount
28 jsr AT, (AT), _mcount
29 .set at
30 .prologue 1
31#elif defined PIC
32 .prologue 0
33#else
34 ldgp $29, 0($27)
35 .prologue 1
36#endif
37
38#ifdef PIC
39 unop
40 bsr $0, __getcontext_x !samegp
41 mov $17, $16
42 br $31, __setcontext !samegp
43#else
44 jsr $0, __getcontext_x
45 mov $17, $16
46 jmp $31, __setcontext
47#endif
48
49END(__swapcontext)
50weak_alias (__swapcontext, swapcontext)
51

source code of glibc/sysdeps/unix/sysv/linux/alpha/swapcontext.S