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 1.20 2015/04/07 01:27:06 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 #define SYSENTRY(x) \ 49 ENTRY(_thread_sys_ ## x); \ 50 .weak _C_LABEL(x); \ 51 _C_LABEL(x) = _C_LABEL(_thread_sys_ ## x) 52 #define SYSENTRY_HIDDEN(x) \ 53 ENTRY(_thread_sys_ ## x) 54 55 #define __DO_SYSCALL(x) \ 56 movl $(SYS_ ## x),%eax; \ 57 int $0x80 58 59 #define CERROR _C_LABEL(__cerror) 60 #define _CERROR _C_LABEL(___cerror) 61 #define CURBRK _C_LABEL(__curbrk) 62 63 /* perform a syscall */ 64 #define _SYSCALL_NOERROR(x,y) \ 65 SYSENTRY(x); \ 66 __DO_SYSCALL(y); 67 #define _SYSCALL_HIDDEN_NOERROR(x,y) \ 68 SYSENTRY_HIDDEN(x); \ 69 __DO_SYSCALL(y); 70 71 #define SYSCALL_NOERROR(x) \ 72 _SYSCALL_NOERROR(x,x) 73 74 /* perform a syscall, set errno */ 75 #ifdef __PIC__ 76 #define _SYSCALL(x,y) \ 77 .text; \ 78 .align 2; \ 79 2: PIC_PROLOGUE; \ 80 movl PIC_GOT(CERROR), %ecx; \ 81 PIC_EPILOGUE; \ 82 jmp *%ecx; \ 83 _SYSCALL_NOERROR(x,y) \ 84 jc 2b 85 #define _SYSCALL_HIDDEN(x,y) \ 86 .text; \ 87 .align 2; \ 88 2: PIC_PROLOGUE; \ 89 movl PIC_GOT(CERROR), %ecx; \ 90 PIC_EPILOGUE; \ 91 jmp *%ecx; \ 92 _SYSCALL_HIDDEN_NOERROR(x,y) \ 93 jc 2b 94 #else 95 #define _SYSCALL(x,y) \ 96 .text; \ 97 .align 2; \ 98 2: \ 99 jmp PIC_PLT(CERROR); \ 100 _SYSCALL_NOERROR(x,y) \ 101 jc 2b 102 #define _SYSCALL_HIDDEN(x,y) \ 103 .text; \ 104 .align 2; \ 105 2: \ 106 jmp PIC_PLT(CERROR); \ 107 _SYSCALL_HIDDEN_NOERROR(x,y) \ 108 jc 2b 109 #endif 110 111 #define SYSCALL(x) \ 112 _SYSCALL(x,x) 113 114 /* perform a syscall, return */ 115 #define PSEUDO_NOERROR(x,y) \ 116 _SYSCALL_NOERROR(x,y); \ 117 ret 118 119 /* perform a syscall, set errno, return */ 120 #define PSEUDO(x,y) \ 121 _SYSCALL(x,y); \ 122 ret 123 #define PSEUDO_HIDDEN(x,y) \ 124 _SYSCALL_HIDDEN(x,y); \ 125 ret 126 127 /* perform a syscall with the same name, set errno, return */ 128 #define RSYSCALL(x) \ 129 PSEUDO(x,x); 130 #define RSYSCALL_HIDDEN(x) \ 131 PSEUDO_HIDDEN(x,x) 132 133 .globl CERROR 134