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 #ifdef __USE_MISC 30 # define __ctx(fld) fld 31 #else 32 # define __ctx(fld) __ ## fld 33 #endif 34 35 #ifdef __USE_MISC 36 typedef int greg_t; 37 38 /* Number of general registers. */ 39 # define NGREG 18 40 41 /* Container for all general registers. */ 42 typedef greg_t gregset_t[NGREG]; 43 44 /* Number of each register is the `gregset_t' array. */ 45 enum 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 81 struct _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. */ 99 typedef 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). */ 106 typedef 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. */ 132 typedef 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 */