1/* Save current context and jump to a new context.
2   Copyright (C) 2002-2022 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 <rtld-global-offsets.h>
21#include <shlib-compat.h>
22
23#define __ASSEMBLY__
24#include <asm/ptrace.h>
25#include "ucontext_i.h"
26
27#define __CONTEXT_FUNC_NAME __swapcontext
28#define __CONTEXT_ENABLE_FPRS 1
29#define __CONTEXT_ENABLE_VRS 1
30
31/* Size of ucontext in GLIBC_2.3.4 and later.  */
32#define _UC_SIZE_2_3_4	1184
33
34	.section ".text";
35ENTRY (__swapcontext)
36	li	r5,_UC_SIZE_2_3_4;
37	DO_CALL (SYS_ify (swapcontext));
38	bso-	cr0,1f
39/* the kernel does not set the return code for the success case */
40	li	r3,0
41	blr
421:
43	b	__syscall_error@local
44END(__swapcontext)
45
46versioned_symbol (libc, __swapcontext, swapcontext, GLIBC_2_3_4)
47
48#if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
49
50	compat_text_section
51
52# undef __CONTEXT_FUNC_NAME
53# define __CONTEXT_FUNC_NAME __novec_swapcontext
54# undef __CONTEXT_ENABLE_VRS
55
56# include "swapcontext-common.S"
57
58	.previous
59
60compat_symbol (libc, __novec_swapcontext, swapcontext, GLIBC_2_3_3)
61
62#endif
63
64#if SHLIB_COMPAT (libc, GLIBC_2_1, GLIBC_2_3_3)
65
66# define _ERRNO_H	1
67# include <bits/errno.h>
68
69	compat_text_section
70ENTRY (__swapcontext_stub)
71	li	r3,ENOSYS
72	b	__syscall_error@local
73END (__swapcontext_stub)
74	.previous
75
76compat_symbol (libc, __swapcontext_stub, swapcontext, GLIBC_2_1)
77
78#endif
79