1/* Copyright (C) 2000-2026 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#ifndef _SYS_UCONTEXT_H
19#define _SYS_UCONTEXT_H 1
20
21#include <features.h>
22
23#include <bits/types/sigset_t.h>
24#include <bits/types/stack_t.h>
25
26
27#ifdef __USE_MISC
28# define __ctx(fld) fld
29#else
30# define __ctx(fld) __ ## fld
31#endif
32
33/* Type for a program status word. */
34typedef struct
35{
36 unsigned long __ctx(mask);
37 unsigned long __ctx(addr);
38} __attribute__ ((__aligned__(8))) __psw_t;
39
40/* Type for a general-purpose register. */
41typedef unsigned long greg_t;
42
43/* And the whole bunch of them. We should have used `struct s390_regs',
44 but to avoid name space pollution and since the tradition says that
45 the register set is an array, we make gregset_t a simple array
46 that has the same size as s390_regs. This is needed for the
47 elf_prstatus structure. */
48#define __NGREG 27
49#ifdef __USE_MISC
50# define NGREG __NGREG
51#endif
52/* Must match kernels psw_t alignment. */
53typedef greg_t gregset_t[__NGREG] __attribute__ ((__aligned__(8)));
54
55typedef union
56 {
57 double __ctx(d);
58 float __ctx(f);
59 } fpreg_t;
60
61/* Register set for the floating-point registers. */
62typedef struct
63 {
64 unsigned int __ctx(fpc);
65 fpreg_t __ctx(fprs)[16];
66 } fpregset_t;
67
68/* Context to describe whole processor state. */
69typedef struct
70 {
71 __psw_t __ctx(psw);
72 unsigned long __ctx(gregs)[16];
73 unsigned int __ctx(aregs)[16];
74 fpregset_t __ctx(fpregs);
75 } mcontext_t;
76
77/* Userlevel context. */
78typedef struct ucontext_t
79 {
80 unsigned long int __ctx(uc_flags);
81 struct ucontext_t *uc_link;
82 stack_t uc_stack;
83 mcontext_t uc_mcontext;
84 sigset_t uc_sigmask;
85 } ucontext_t;
86
87#undef __ctx
88
89
90#endif /* sys/ucontext.h */