1 /* $NetBSD: mcontext.h,v 1.19 2024/11/30 01:04:10 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1999 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. 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 _I386_MCONTEXT_H_ 33 #define _I386_MCONTEXT_H_ 34 35 36 /* 37 * mcontext extensions to handle signal delivery. 38 */ 39 #define _UC_SETSTACK _UC_MD_BIT16 40 #define _UC_CLRSTACK _UC_MD_BIT17 41 #define _UC_VM _UC_MD_BIT18 42 #define _UC_TLSBASE _UC_MD_BIT19 43 44 /* 45 * Layout of mcontext_t according to the System V Application Binary Interface, 46 * Intel386(tm) Architecture Processor Supplement, Fourth Edition. 47 */ 48 49 /* 50 * General register state 51 */ 52 #define _NGREG 19 53 typedef int __greg_t; 54 typedef __greg_t __gregset_t[_NGREG]; 55 56 #define _REG_GS 0 57 #define _REG_FS 1 58 #define _REG_ES 2 59 #define _REG_DS 3 60 #define _REG_EDI 4 61 #define _REG_ESI 5 62 #define _REG_EBP 6 63 #define _REG_ESP 7 64 #define _REG_EBX 8 65 #define _REG_EDX 9 66 #define _REG_ECX 10 67 #define _REG_EAX 11 68 #define _REG_TRAPNO 12 69 #define _REG_ERR 13 70 #define _REG_EIP 14 71 #define _REG_CS 15 72 #define _REG_EFL 16 73 #define _REG_UESP 17 74 #define _REG_SS 18 75 76 /* 77 * Floating point register state 78 */ 79 typedef struct { 80 union { 81 struct { 82 int __fp_state[27]; /* Environment and registers */ 83 } __fpchip_state; /* x87 regs in fsave format */ 84 struct { 85 char __fp_xmm[512]; 86 } __fp_xmm_state; /* x87 and xmm regs in fxsave format */ 87 int __fp_fpregs[128]; 88 } __fp_reg_set; 89 int __fp_pad[33]; /* Historic padding */ 90 } __fpregset_t; 91 __CTASSERT(sizeof (__fpregset_t) == 512 + 33 * 4); 92 93 typedef struct { 94 __gregset_t __gregs; 95 __fpregset_t __fpregs; 96 __greg_t _mc_tlsbase; 97 } mcontext_t; 98 99 #define _UC_FXSAVE _UC_MD_BIT5 /* FP state is in FXSAVE format in XMM space */ 100 101 #define _UC_MACHINE_PAD 4 /* Padding appended to ucontext_t */ 102 103 #define _UC_UCONTEXT_ALIGN (~0xf) 104 105 #ifndef _UC_MACHINE_SP 106 #define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_UESP]) 107 #endif 108 #define _UC_MACHINE_FP(uc) ((uc)->uc_mcontext.__gregs[_REG_EBP]) 109 #define _UC_MACHINE_PC(uc) ((uc)->uc_mcontext.__gregs[_REG_EIP]) 110 #define _UC_MACHINE_INTRV(uc) ((uc)->uc_mcontext.__gregs[_REG_EAX]) 111 112 #define _UC_MACHINE_SET_PC(uc, pc) _UC_MACHINE_PC(uc) = (pc) 113 114 #define __UCONTEXT_SIZE 776 115 116 #endif /* !_I386_MCONTEXT_H_ */ 117