1 /* Copyright (C) 1998-2021 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 typedef int greg_t; 30 31 /* Number of general registers. */ 32 #define __NGREG 16 33 #ifdef __USE_MISC 34 # define NGREG __NGREG 35 #endif 36 37 /* Container for all general registers. */ 38 typedef greg_t gregset_t[__NGREG]; 39 40 #ifdef __USE_MISC 41 /* Number of each register is the `gregset_t' array. */ 42 enum 43 { 44 R0 = 0, 45 # define R0 R0 46 R1 = 1, 47 # define R1 R1 48 R2 = 2, 49 # define R2 R2 50 R3 = 3, 51 # define R3 R3 52 R4 = 4, 53 # define R4 R4 54 R5 = 5, 55 # define R5 R5 56 R6 = 6, 57 # define R6 R6 58 R7 = 7, 59 # define R7 R7 60 R8 = 8, 61 # define R8 R8 62 R9 = 9, 63 # define R9 R9 64 R10 = 10, 65 # define R10 R10 66 R11 = 11, 67 # define R11 R11 68 R12 = 12, 69 # define R12 R12 70 R13 = 13, 71 # define R13 R13 72 R14 = 14, 73 # define R14 R14 74 R15 = 15, 75 # define R15 R15 76 }; 77 #endif 78 79 #ifdef __USE_MISC 80 # define __ctx(fld) fld 81 #else 82 # define __ctx(fld) __ ## fld 83 #endif 84 85 /* Structure to describe FPU registers. */ 86 typedef struct 87 { 88 } fpregset_t; 89 90 /* Context to describe whole processor state. */ 91 typedef struct 92 { 93 gregset_t __ctx(gregs); 94 fpregset_t __ctx(fpregs); 95 } mcontext_t; 96 97 /* Userlevel context. */ 98 typedef struct ucontext_t 99 { 100 unsigned long int __ctx(uc_flags); 101 struct ucontext_t *uc_link; 102 sigset_t uc_sigmask; 103 stack_t uc_stack; 104 mcontext_t uc_mcontext; 105 long int __glibc_reserved1[5]; 106 } ucontext_t; 107 108 #undef __ctx 109 110 #endif /* sys/ucontext.h */ 111