1 /* $OpenBSD: SYS.h,v 1.21 2023/01/11 01:55:17 mortimer 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) movl $(SYS_ ## x),%eax; movq %rcx, %r10; syscall 45 46 #define SYSENTRY(x) \ 47 SYSENTRY_HIDDEN(x); \ 48 WEAK_ALIAS(x, _thread_sys_##x) 49 #define SYSENTRY_HIDDEN(x) \ 50 ENTRY(_thread_sys_ ## x) 51 52 #define SYSCALL_END_HIDDEN(x) \ 53 END(_thread_sys_ ## x); \ 54 _HIDDEN_FALIAS(x,_thread_sys_##x); \ 55 END(_HIDDEN(x)) 56 #define SYSCALL_END(x) SYSCALL_END_HIDDEN(x); END(x) 57 58 59 #define SET_ERRNO \ 60 movl %eax,%fs:(TCB_OFFSET_ERRNO); \ 61 movq $-1, %rax 62 #define HANDLE_ERRNO \ 63 jnc 99f; \ 64 SET_ERRNO; \ 65 99: 66 67 #define _SYSCALL_NOERROR(x,y) \ 68 SYSENTRY(x); \ 69 SYSTRAP(y) 70 #define _SYSCALL_HIDDEN_NOERROR(x,y) \ 71 SYSENTRY_HIDDEN(x); \ 72 SYSTRAP(y) 73 74 #define SYSCALL_NOERROR(x) \ 75 _SYSCALL_NOERROR(x,x) 76 77 #define SYSCALL_HIDDEN(x) \ 78 _SYSCALL_HIDDEN_NOERROR(x,x); \ 79 HANDLE_ERRNO 80 #define SYSCALL(x) \ 81 _SYSCALL_NOERROR(x,x); \ 82 HANDLE_ERRNO 83 84 85 #define PSEUDO_NOERROR(x,y) \ 86 SYSENTRY(x); \ 87 RETGUARD_SETUP(_thread_sys_##x, r11); \ 88 RETGUARD_PUSH(r11); \ 89 SYSTRAP(y); \ 90 RETGUARD_POP(r11); \ 91 RETGUARD_CHECK(_thread_sys_##x, r11); \ 92 ret; \ 93 SYSCALL_END(x) 94 95 #define PSEUDO(x,y) \ 96 SYSENTRY(x); \ 97 RETGUARD_SETUP(_thread_sys_##x, r11); \ 98 RETGUARD_PUSH(r11); \ 99 SYSTRAP(y); \ 100 HANDLE_ERRNO; \ 101 RETGUARD_POP(r11); \ 102 RETGUARD_CHECK(_thread_sys_##x, r11); \ 103 ret; \ 104 SYSCALL_END(x) 105 106 #define PSEUDO_HIDDEN(x,y) \ 107 SYSENTRY_HIDDEN(x); \ 108 RETGUARD_SETUP(_thread_sys_##x, r11); \ 109 RETGUARD_PUSH(r11); \ 110 SYSTRAP(y); \ 111 HANDLE_ERRNO; \ 112 RETGUARD_POP(r11); \ 113 RETGUARD_CHECK(_thread_sys_##x , r11); \ 114 ret; \ 115 SYSCALL_END_HIDDEN(x) 116 117 #define RSYSCALL_NOERROR(x) \ 118 PSEUDO_NOERROR(x,x) 119 120 #define RSYSCALL(x) \ 121 PSEUDO(x,x) 122 #define RSYSCALL_HIDDEN(x) \ 123 PSEUDO_HIDDEN(x,x) 124