1 /*- 2 * Copyright (c) 1990 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * $OpenBSD: SYS.h,v 1.8 2000/01/06 10:49:20 d Exp $ 37 */ 38 39 #include <machine/asm.h> 40 #include <sys/syscall.h> 41 42 /* 43 * Design note: 44 * 45 * System calls entry points are really named _thread_sys_{syscall}, 46 * and weakly aliased to the name {syscall}. This allows the thread 47 * library to replace system calls at link time. 48 */ 49 50 #ifdef _NO_WEAK_ALIASES 51 52 #ifdef _THREAD_SAFE 53 /* Use _thread_sys_{syscall} when compiled with -D_THREAD_SAFE */ 54 #ifdef __STDC__ 55 #define SYSENTRY(x) ENTRY(_thread_sys_ ## x) 56 #else /* ! __STDC__ */ 57 #define SYSENTRY(x) ENTRY(_thread_sys_/**/x) 58 #endif /* ! __STDC__ */ 59 #else /* ! _THREAD_SAFE */ 60 /* Use {syscall} when compiling without -D_THREAD_SAFE */ 61 #define SYSENTRY(x) ENTRY(x) 62 #endif /* ! _THREAD_SAFE */ 63 64 #else /* WEAK_ALIASES */ 65 66 /* Use both _thread_sys_{syscall} and [weak] {syscall}. */ 67 68 #ifdef __STDC__ 69 #define SYSENTRY(x) \ 70 ENTRY(_thread_sys_ ## x) \ 71 .weak _C_LABEL(x); \ 72 _C_LABEL(x) = _C_LABEL(_thread_sys_ ## x) 73 #else /* ! __STDC__ */ 74 #define SYSENTRY(x) \ 75 ENTRY(_thread_sys_/**/x) \ 76 .weak _C_LABEL(x); \ 77 _C_LABEL(x) = _C_LABEL(_thread_sys_/**/x) 78 #endif /* ! __STDC__ */ 79 #endif /* WEAK_ALIASES */ 80 81 #ifdef __STDC__ 82 #define __DO_SYSCALL(x) \ 83 movl $(SYS_ ## x),%eax; \ 84 int $0x80 85 #else /* ! __STDC__ */ 86 #define __DO_SYSCALL(x) \ 87 movl $(SYS_/**/x),%eax; \ 88 int $0x80 89 #endif /* ! __STDC__ */ 90 91 /* perform a syscall, set errno */ 92 #define SYSCALL(x) \ 93 .text; \ 94 .align 2; \ 95 2: \ 96 jmp PIC_PLT(cerror); \ 97 SYSENTRY(x); \ 98 __DO_SYSCALL(x); \ 99 jc 2b 100 101 /* perform a syscall, set errno, return */ 102 #define RSYSCALL(x) \ 103 SYSCALL(x); \ 104 ret 105 106 /* perform a syscall, return */ 107 #define PSEUDO(x,y) \ 108 SYSENTRY(x); \ 109 __DO_SYSCALL(y); \ 110 ret 111 112 .globl cerror 113