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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $OpenBSD: SYS.h,v 1.17 2011/04/04 12:42:39 guenther Exp $ 33 */ 34 35 #include <machine/asm.h> 36 #include <sys/syscall.h> 37 38 /* 39 * Design note: 40 * 41 * System calls entry points are really named _thread_sys_{syscall}, 42 * and weakly aliased to the name {syscall}. This allows the thread 43 * library to replace system calls at link time. 44 */ 45 46 /* Use both _thread_sys_{syscall} and [weak] {syscall}. */ 47 48 #ifdef __STDC__ 49 #define SYSENTRY(x) \ 50 ENTRY(_thread_sys_ ## x); \ 51 .weak _C_LABEL(x); \ 52 _C_LABEL(x) = _C_LABEL(_thread_sys_ ## x) 53 #else /* ! __STDC__ */ 54 #define SYSENTRY(x) \ 55 ENTRY(_thread_sys_/**/x); \ 56 .weak _C_LABEL(x); \ 57 _C_LABEL(x) = _C_LABEL(_thread_sys_/**/x) 58 #endif /* ! __STDC__ */ 59 60 #ifdef __STDC__ 61 #define __DO_SYSCALL(x) \ 62 movl $(SYS_ ## x),%eax; \ 63 int $0x80 64 #else /* ! __STDC__ */ 65 #define __DO_SYSCALL(x) \ 66 movl $(SYS_/**/x),%eax; \ 67 int $0x80 68 #endif /* ! __STDC__ */ 69 70 #define CERROR _C_LABEL(__cerror) 71 #define _CERROR _C_LABEL(___cerror) 72 #define CURBRK _C_LABEL(__curbrk) 73 74 /* perform a syscall */ 75 #define _SYSCALL_NOERROR(x,y) \ 76 SYSENTRY(x); \ 77 __DO_SYSCALL(y); 78 79 #define SYSCALL_NOERROR(x) \ 80 _SYSCALL_NOERROR(x,x) 81 82 /* perform a syscall, set errno */ 83 #ifdef PIC 84 #define _SYSCALL(x,y) \ 85 .text; \ 86 .align 2; \ 87 2: PIC_PROLOGUE; \ 88 movl PIC_GOT(CERROR), %ecx; \ 89 PIC_EPILOGUE; \ 90 jmp *%ecx; \ 91 _SYSCALL_NOERROR(x,y) \ 92 jc 2b 93 #else 94 #define _SYSCALL(x,y) \ 95 .text; \ 96 .align 2; \ 97 2: \ 98 jmp PIC_PLT(CERROR); \ 99 _SYSCALL_NOERROR(x,y) \ 100 jc 2b 101 #endif 102 103 #define SYSCALL(x) \ 104 _SYSCALL(x,x) 105 106 /* perform a syscall, return */ 107 #define PSEUDO_NOERROR(x,y) \ 108 _SYSCALL_NOERROR(x,y); \ 109 ret 110 111 /* perform a syscall, set errno, return */ 112 #define PSEUDO(x,y) \ 113 _SYSCALL(x,y); \ 114 ret 115 116 /* perform a syscall with the same name, set errno, return */ 117 #define RSYSCALL(x) \ 118 PSEUDO(x,x); 119 120 .globl CERROR 121