1 /* $NetBSD: ucontext.h,v 1.24 2024/05/25 13:44:48 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 1999, 2003, 2024 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Klaus Klein, and by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef _SYS_UCONTEXT_H_ 33 #define _SYS_UCONTEXT_H_ 34 35 #include <sys/sigtypes.h> 36 37 /* uc_flags */ 38 #define _UC_SIGMASK 0x01 /* valid uc_sigmask */ 39 #define _UC_STACK 0x02 /* valid uc_stack */ 40 #define _UC_CPU 0x04 /* valid GPR context in uc_mcontext */ 41 #define _UC_FPU 0x08 /* valid FPU context in uc_mcontext */ 42 #define _UC_MD_BIT5 0x00000020 /* MD bits. see below */ 43 #define _UC_MD_BIT16 0x00010000 44 #define _UC_MD_BIT17 0x00020000 45 #define _UC_MD_BIT18 0x00040000 46 #define _UC_MD_BIT19 0x00080000 47 #define _UC_MD_BIT20 0x00100000 48 #define _UC_MD_BIT21 0x00200000 49 #define _UC_MD_BIT30 0x40000000 50 51 /* 52 * if your port needs more MD bits, please choose bits from _UC_MD_BIT* 53 * rather than picking random unused bits. 54 * 55 * For historical reasons, some common flags have machine-dependent 56 * definitions. All platforms must define and handle those flags, 57 * which are: 58 * 59 * _UC_TLSBASE Context contains valid pthread private pointer 60 * 61 * _UC_SETSTACK Context uses signal stack 62 * 63 * _UC_CLRSTACK Context does not use signal stack 64 */ 65 66 #include <machine/mcontext.h> 67 68 typedef struct __ucontext ucontext_t; 69 70 struct __ucontext { 71 unsigned int uc_flags; /* properties */ 72 ucontext_t * uc_link; /* context to resume */ 73 sigset_t uc_sigmask; /* signals blocked in this context */ 74 stack_t uc_stack; /* the stack used by this context */ 75 mcontext_t uc_mcontext; /* machine state */ 76 #if defined(_UC_MACHINE_PAD) 77 long __uc_pad[_UC_MACHINE_PAD]; 78 #endif 79 }; 80 81 #ifndef _UC_UCONTEXT_ALIGN 82 #define _UC_UCONTEXT_ALIGN (~0) 83 #endif 84 85 #ifndef __UCONTEXT_SIZE 86 #define __UCONTEXT_SIZE sizeof(ucontext_t) 87 #endif 88 89 #ifndef _UC_TLSBASE 90 #error _UC_TLSBASE not defined. 91 #endif 92 93 #ifndef _UC_SETSTACK 94 #error _UC_SETSTACK not defined. 95 #endif 96 97 #ifndef _UC_CLRSTACK 98 #error _UC_CLRSTACK not defined. 99 #endif 100 101 #ifdef _KERNEL 102 struct lwp; 103 104 void getucontext(struct lwp *, ucontext_t *); 105 int setucontext(struct lwp *, const ucontext_t *); 106 void cpu_getmcontext(struct lwp *, mcontext_t *, unsigned int *); 107 int cpu_setmcontext(struct lwp *, const mcontext_t *, unsigned int); 108 int cpu_mcontext_validate(struct lwp *, const mcontext_t *); 109 110 #ifdef __UCONTEXT_SIZE 111 __CTASSERT(sizeof(ucontext_t) == __UCONTEXT_SIZE); 112 #endif 113 #endif /* _KERNEL */ 114 115 #endif /* !_SYS_UCONTEXT_H_ */ 116