1/* Copyright (C) 2001-2022 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#include <sysdep.h>
19#include <features.h>
20
21#include "ucontext_i.h"
22
23#include <shlib-compat.h>
24
25/*  __getcontext (const ucontext_t *ucp)
26
27  Saves the machine context in UCP such that when it is activated,
28  it appears as if __getcontext() returned again.
29
30  This implementation is intended to be used for *synchronous* context
31  switches only.  Therefore, it does not have to save anything
32  other than the PRESERVED state.  */
33
34ENTRY(__getcontext)
35	lgr     %r1,%r2
36
37	/* rt_sigprocmask (SIG_BLOCK, NULL, &sc->sc_mask, sigsetsize).  */
38	la      %r2,SIG_BLOCK
39	slgr	%r3,%r3
40	la	%r4,SC_MASK(%r1)
41	lghi	%r5,_NSIG8
42	svc	SYS_ify(rt_sigprocmask)
43
44	/* Store fpu context.  */
45	stfpc   SC_FPC(%r1)
46	std     %f0,SC_FPRS(%r1)
47	std     %f1,SC_FPRS+8(%r1)
48	std     %f2,SC_FPRS+16(%r1)
49	std     %f3,SC_FPRS+24(%r1)
50	std     %f4,SC_FPRS+32(%r1)
51	std     %f5,SC_FPRS+40(%r1)
52	std     %f6,SC_FPRS+48(%r1)
53	std     %f7,SC_FPRS+56(%r1)
54	std     %f8,SC_FPRS+64(%r1)
55	std     %f9,SC_FPRS+72(%r1)
56	std     %f10,SC_FPRS+80(%r1)
57	std     %f11,SC_FPRS+88(%r1)
58	std     %f12,SC_FPRS+96(%r1)
59	std     %f13,SC_FPRS+104(%r1)
60	std     %f14,SC_FPRS+112(%r1)
61	std     %f15,SC_FPRS+120(%r1)
62
63	/* Set __getcontext return value to 0.  */
64	slgr    %r2,%r2
65
66	/* Store access registers.  */
67	stam    %a0,%a15,SC_ACRS(%r1)
68
69	/* Store general purpose registers.  */
70	stmg    %r0,%r15,SC_GPRS(%r1)
71
72	/* Return.  */
73	br	%r14
74END(__getcontext)
75
76#if defined SHARED && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20)
77/* In glibc release 2.19 a new version of getcontext was introduced,
78   but was reverted before 2.20. Thus both versions are the same function.  */
79weak_alias (__getcontext, __v1__getcontext)
80weak_alias (__getcontext, __v2__getcontext)
81versioned_symbol (libc, __v1__getcontext, getcontext, GLIBC_2_1)
82compat_symbol (libc, __v2__getcontext, getcontext, GLIBC_2_19)
83
84#else
85
86weak_alias (__getcontext, getcontext)
87
88#endif /* !(defined SHARED && SHLIB_COMPAT (libc, GLIBC_2_19, GLIBC_2_20))  */
89