1 /* Save current context.
2    Copyright (C) 2002-2021 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 __getcontext
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";
35 ENTRY (__getcontext)
36 	li	r4,0
37 	li	r5,_UC_SIZE_2_3_4;
38 	DO_CALL (SYS_ify (swapcontext));
39 	bso-	cr0,1f
40 /* the kernel does not set the return code for the success case */
41 	li	r3,0
42 	blr
43 1:
44 	b	__syscall_error@local
45 END(__getcontext)
46 
47 versioned_symbol (libc, __getcontext, getcontext, GLIBC_2_3_4)
48 
49 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
50 	compat_text_section
51 
52 # undef __CONTEXT_FUNC_NAME
53 # define __CONTEXT_FUNC_NAME __novec_getcontext
54 # undef __CONTEXT_ENABLE_VRS
55 
56 # include "getcontext-common.S"
57 
58 	.previous
59 
60 compat_symbol (libc, __novec_getcontext, getcontext, 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
70 ENTRY (__getcontext_stub)
71 	li	r3,ENOSYS
72 	b	__syscall_error@local
73 END (__getcontext_stub)
74 	.previous
75 
76 compat_symbol (libc, __getcontext_stub, getcontext, GLIBC_2_1)
77 
78 #endif
79