1/* Copyright (C) 2000-2025 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#if __WORDSIZE == 64
49# define __NGREG 27
50#else
51# define __NGREG 36
52#endif
53#ifdef __USE_MISC
54# define NGREG __NGREG
55#endif
56/* Must match kernels psw_t alignment.  */
57typedef greg_t gregset_t[__NGREG] __attribute__ ((__aligned__(8)));
58
59typedef union
60  {
61    double  __ctx(d);
62    float   __ctx(f);
63  } fpreg_t;
64
65/* Register set for the floating-point registers.  */
66typedef struct
67  {
68    unsigned int __ctx(fpc);
69    fpreg_t __ctx(fprs)[16];
70  } fpregset_t;
71
72/* Context to describe whole processor state.  */
73typedef struct
74  {
75    __psw_t __ctx(psw);
76    unsigned long __ctx(gregs)[16];
77    unsigned int __ctx(aregs)[16];
78    fpregset_t __ctx(fpregs);
79  } mcontext_t;
80
81/* Userlevel context.  */
82typedef struct ucontext_t
83  {
84    unsigned long int __ctx(uc_flags);
85    struct ucontext_t *uc_link;
86    stack_t uc_stack;
87    mcontext_t uc_mcontext;
88    sigset_t uc_sigmask;
89  } ucontext_t;
90
91#undef __ctx
92
93
94#endif /* sys/ucontext.h */