1/* Copyright (C) 1998-2026 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/* System V/ARM ABI compliant context switching support. */
19
20#ifndef _SYS_UCONTEXT_H
21#define _SYS_UCONTEXT_H 1
22
23#include <features.h>
24
25#include <bits/types/sigset_t.h>
26#include <bits/types/stack_t.h>
27
28
29#ifdef __USE_MISC
30# define __ctx(fld) fld
31#else
32# define __ctx(fld) __ ## fld
33#endif
34
35#ifdef __USE_MISC
36typedef int greg_t;
37
38/* Number of general registers. */
39# define NGREG 18
40
41/* Container for all general registers. */
42typedef greg_t gregset_t[NGREG];
43
44/* Number of each register is the `gregset_t' array. */
45enum
46{
47 REG_R0 = 0,
48# define REG_R0 REG_R0
49 REG_R1 = 1,
50# define REG_R1 REG_R1
51 REG_R2 = 2,
52# define REG_R2 REG_R2
53 REG_R3 = 3,
54# define REG_R3 REG_R3
55 REG_R4 = 4,
56# define REG_R4 REG_R4
57 REG_R5 = 5,
58# define REG_R5 REG_R5
59 REG_R6 = 6,
60# define REG_R6 REG_R6
61 REG_R7 = 7,
62# define REG_R7 REG_R7
63 REG_R8 = 8,
64# define REG_R8 REG_R8
65 REG_R9 = 9,
66# define REG_R9 REG_R9
67 REG_R10 = 10,
68# define REG_R10 REG_R10
69 REG_R11 = 11,
70# define REG_R11 REG_R11
71 REG_R12 = 12,
72# define REG_R12 REG_R12
73 REG_R13 = 13,
74# define REG_R13 REG_R13
75 REG_R14 = 14,
76# define REG_R14 REG_R14
77 REG_R15 = 15
78# define REG_R15 REG_R15
79};
80
81struct _libc_fpstate
82{
83 struct
84 {
85 unsigned int sign1:1;
86 unsigned int unused:15;
87 unsigned int sign2:1;
88 unsigned int exponent:14;
89 unsigned int j:1;
90 unsigned int mantissa1:31;
91 unsigned int mantissa0:32;
92 } fpregs[8];
93 unsigned int fpsr:32;
94 unsigned int fpcr:32;
95 unsigned char ftype[8];
96 unsigned int init_flag;
97};
98/* Structure to describe FPU registers. */
99typedef struct _libc_fpstate fpregset_t;
100#endif
101
102/* Context to describe whole processor state. This only describes
103 the core registers; coprocessor registers get saved elsewhere
104 (e.g. in uc_regspace, or somewhere unspecified on the stack
105 during non-RT signal handlers). */
106typedef struct
107 {
108 unsigned long int __ctx(trap_no);
109 unsigned long int __ctx(error_code);
110 unsigned long int __ctx(oldmask);
111 unsigned long int __ctx(arm_r0);
112 unsigned long int __ctx(arm_r1);
113 unsigned long int __ctx(arm_r2);
114 unsigned long int __ctx(arm_r3);
115 unsigned long int __ctx(arm_r4);
116 unsigned long int __ctx(arm_r5);
117 unsigned long int __ctx(arm_r6);
118 unsigned long int __ctx(arm_r7);
119 unsigned long int __ctx(arm_r8);
120 unsigned long int __ctx(arm_r9);
121 unsigned long int __ctx(arm_r10);
122 unsigned long int __ctx(arm_fp);
123 unsigned long int __ctx(arm_ip);
124 unsigned long int __ctx(arm_sp);
125 unsigned long int __ctx(arm_lr);
126 unsigned long int __ctx(arm_pc);
127 unsigned long int __ctx(arm_cpsr);
128 unsigned long int __ctx(fault_address);
129 } mcontext_t;
130
131/* Userlevel context. */
132typedef struct ucontext_t
133 {
134 unsigned long __ctx(uc_flags);
135 struct ucontext_t *uc_link;
136 stack_t uc_stack;
137 mcontext_t uc_mcontext;
138 sigset_t uc_sigmask;
139 unsigned long __ctx(uc_regspace)[128] __attribute__((__aligned__(8)));
140 } ucontext_t;
141
142#undef __ctx
143
144#endif /* sys/ucontext.h */