ucontext.h (2417B) - Raw
1 /* Copyright (C) 1998-2025 Free Software Foundation, Inc. 2 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 /* System V/AArch64 ABI compliant context switching support. */ 20 21 #ifndef _SYS_UCONTEXT_H 22 #define _SYS_UCONTEXT_H 1 23 24 #include <features.h> 25 26 #include <bits/types/sigset_t.h> 27 #include <bits/types/stack_t.h> 28 29 #ifdef __USE_MISC 30 # define __ctx(fld) fld 31 #else 32 # define __ctx(fld) __ ## fld 33 #endif 34 35 #ifdef __USE_MISC 36 # include <sys/procfs.h> 37 38 39 typedef elf_greg_t greg_t; 40 41 /* Container for all general registers. */ 42 typedef elf_gregset_t gregset_t; 43 44 /* Structure to describe FPU registers. */ 45 typedef elf_fpregset_t fpregset_t; 46 #endif 47 48 /* Context to describe whole processor state. This only describes 49 the core registers; coprocessor registers get saved elsewhere 50 (e.g. in uc_regspace, or somewhere unspecified on the stack 51 during non-RT signal handlers). */ 52 typedef struct 53 { 54 unsigned long long int __ctx(fault_address); 55 unsigned long long int __ctx(regs)[31]; 56 unsigned long long int __ctx(sp); 57 unsigned long long int __ctx(pc); 58 unsigned long long int __ctx(pstate); 59 /* This field contains extension records for additional processor 60 state such as the FP/SIMD state. It has to match the definition 61 of the corresponding field in the sigcontext struct, see the 62 arch/arm64/include/uapi/asm/sigcontext.h linux header for details. */ 63 unsigned char __reserved[4096] __attribute__ ((__aligned__ (16))); 64 } mcontext_t; 65 66 /* Userlevel context. */ 67 typedef struct ucontext_t 68 { 69 unsigned long __ctx(uc_flags); 70 struct ucontext_t *uc_link; 71 stack_t uc_stack; 72 sigset_t uc_sigmask; 73 mcontext_t uc_mcontext; 74 } ucontext_t; 75 76 #undef __ctx 77 78 #endif /* sys/ucontext.h */