1 /* $OpenBSD: SYS.h,v 1.22 2023/12/10 16:45:50 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 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 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91 35 * $NetBSD: SYS.h,v 1.5 2002/06/03 18:30:32 fvdl Exp $ 36 */ 37 38 #include "DEFS.h" 39 #include <sys/syscall.h> 40 41 /* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */ 42 #define TCB_OFFSET_ERRNO 32 43 44 #define SYSTRAP(x) \ 45 movl $(SYS_ ## x),%eax; \ 46 movq %rcx, %r10; \ 47 97: syscall; \ 48 PINSYSCALL(SYS_ ## x, 97b) 49 50 #define SYSENTRY(x) \ 51 SYSENTRY_HIDDEN(x); \ 52 WEAK_ALIAS(x, _thread_sys_##x) 53 #define SYSENTRY_HIDDEN(x) \ 54 ENTRY(_thread_sys_ ## x) 55 56 #define SYSCALL_END_HIDDEN(x) \ 57 END(_thread_sys_ ## x); \ 58 _HIDDEN_FALIAS(x,_thread_sys_##x); \ 59 END(_HIDDEN(x)) 60 #define SYSCALL_END(x) SYSCALL_END_HIDDEN(x); END(x) 61 62 63 #define SET_ERRNO \ 64 movl %eax,%fs:(TCB_OFFSET_ERRNO); \ 65 movq $-1, %rax 66 #define HANDLE_ERRNO \ 67 jnc 99f; \ 68 SET_ERRNO; \ 69 99: 70 71 #define _SYSCALL_NOERROR(x,y) \ 72 SYSENTRY(x); \ 73 SYSTRAP(y) 74 #define _SYSCALL_HIDDEN_NOERROR(x,y) \ 75 SYSENTRY_HIDDEN(x); \ 76 SYSTRAP(y) 77 78 #define SYSCALL_NOERROR(x) \ 79 _SYSCALL_NOERROR(x,x) 80 81 #define SYSCALL_HIDDEN(x) \ 82 _SYSCALL_HIDDEN_NOERROR(x,x); \ 83 HANDLE_ERRNO 84 #define SYSCALL(x) \ 85 _SYSCALL_NOERROR(x,x); \ 86 HANDLE_ERRNO 87 88 89 #define PSEUDO_NOERROR(x,y) \ 90 SYSENTRY(x); \ 91 RETGUARD_SETUP(_thread_sys_##x, r11); \ 92 RETGUARD_PUSH(r11); \ 93 SYSTRAP(y); \ 94 RETGUARD_POP(r11); \ 95 RETGUARD_CHECK(_thread_sys_##x, r11); \ 96 ret; \ 97 SYSCALL_END(x) 98 99 #define PSEUDO(x,y) \ 100 SYSENTRY(x); \ 101 RETGUARD_SETUP(_thread_sys_##x, r11); \ 102 RETGUARD_PUSH(r11); \ 103 SYSTRAP(y); \ 104 HANDLE_ERRNO; \ 105 RETGUARD_POP(r11); \ 106 RETGUARD_CHECK(_thread_sys_##x, r11); \ 107 ret; \ 108 SYSCALL_END(x) 109 110 #define PSEUDO_HIDDEN(x,y) \ 111 SYSENTRY_HIDDEN(x); \ 112 RETGUARD_SETUP(_thread_sys_##x, r11); \ 113 RETGUARD_PUSH(r11); \ 114 SYSTRAP(y); \ 115 HANDLE_ERRNO; \ 116 RETGUARD_POP(r11); \ 117 RETGUARD_CHECK(_thread_sys_##x , r11); \ 118 ret; \ 119 SYSCALL_END_HIDDEN(x) 120 121 #define RSYSCALL_NOERROR(x) \ 122 PSEUDO_NOERROR(x,x) 123 124 #define RSYSCALL(x) \ 125 PSEUDO(x,x) 126 #define RSYSCALL_HIDDEN(x) \ 127 PSEUDO_HIDDEN(x,x) 128