1 /* $OpenBSD: SYS.h,v 1.5 2023/12/10 16:45:52 deraadt Exp $ */ 2 /*- 3 * Copyright (c) 2020 Brian Bamsch <bbamsch@google.com> 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 */ 36 37 #include "DEFS.h" 38 #include <sys/syscall.h> 39 40 /* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */ 41 #define TCB_OFFSET_ERRNO (-12) 42 43 /* offset of errno from tp */ 44 #define TP_OFFSET_ERRNO TCB_OFFSET_ERRNO 45 46 #define SYSENTRY(x) \ 47 .weak x; \ 48 x = _thread_sys_ ## x; \ 49 ENTRY(_thread_sys_ ## x) 50 #define SYSENTRY_HIDDEN(x) \ 51 ENTRY(_thread_sys_ ## x) 52 #define __END_HIDDEN(x) \ 53 END(_thread_sys_ ## x); \ 54 _HIDDEN_FALIAS(x, _thread_sys_ ## x); \ 55 END(_HIDDEN(x)) 56 #define __END(x) \ 57 __END_HIDDEN(x); END(x) 58 59 #define SYSTRAP(x) \ 60 li t0, SYS_ ## x; \ 61 97: ecall; \ 62 PINSYSCALL(SYS_ ## x, 97b) 63 64 #define HANDLE_ERROR() \ 65 beqz t0, 200f; \ 66 sw a0, TP_OFFSET_ERRNO(tp); \ 67 li a0, -1; \ 68 200: 69 70 #define HANDLE_ERROR_TARGET(target) \ 71 beqz t0, 200f; \ 72 sw a0, TP_OFFSET_ERRNO(tp); \ 73 li a0, -1; \ 74 j target; \ 75 200: 76 #define _SYSCALL_NOERROR(x,y) \ 77 SYSENTRY(x); \ 78 SYSTRAP(y) 79 #define _SYSCALL_HIDDEN_NOERROR(x,y) \ 80 SYSENTRY_HIDDEN(x); \ 81 SYSTRAP(y) 82 83 #define _SYSCALL(x, y) \ 84 _SYSCALL_NOERROR(x,y); \ 85 HANDLE_ERROR() \ 86 #define _SYSCALL_HIDDEN(x, y) \ 87 _SYSCALL_HIDDEN_NOERROR(x,y); \ 88 HANDLE_ERROR() \ 89 90 #define SYSCALL_NOERROR(x) \ 91 _SYSCALL_NOERROR(x,x) 92 93 #define SYSCALL(x) \ 94 _SYSCALL(x,x) 95 96 97 #define PSEUDO_NOERROR(x,y) \ 98 SYSENTRY(x); \ 99 RETGUARD_SETUP(x, t6); \ 100 SYSTRAP(y); \ 101 RETGUARD_CHECK(x, t6); \ 102 ret; \ 103 __END(x) 104 105 #define PSEUDO(x,y) \ 106 SYSENTRY(x); \ 107 RETGUARD_SETUP(x, t6); \ 108 SYSTRAP(y); \ 109 HANDLE_ERROR(); \ 110 RETGUARD_CHECK(x, t6); \ 111 ret; \ 112 __END(x) 113 #define PSEUDO_HIDDEN(x,y) \ 114 SYSENTRY_HIDDEN(x); \ 115 RETGUARD_SETUP(x, t6); \ 116 SYSTRAP(y); \ 117 HANDLE_ERROR(); \ 118 RETGUARD_CHECK(x, t6); \ 119 ret; \ 120 __END_HIDDEN(x) 121 122 #define RSYSCALL_NOERROR(x) \ 123 PSEUDO_NOERROR(x,x) 124 125 #define RSYSCALL(x) \ 126 PSEUDO(x,x) 127 #define RSYSCALL_HIDDEN(x) \ 128 PSEUDO_HIDDEN(x,x) 129 #define SYSCALL_END(x) \ 130 __END(x) 131 #define SYSCALL_END_HIDDEN(x) \ 132 __END_HIDDEN(x) 133