1 /* $OpenBSD: SYS.h,v 1.15 2016/05/07 19:05:21 guenther Exp $ */ 2 /* $NetBSD: SYS.h,v 1.8 2003/08/07 16:42:02 agc Exp $ */ 3 4 /*- 5 * Copyright (c) 1990 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * William Jolitz. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: @(#)SYS.h 5.5 (Berkeley) 5/7/91 36 */ 37 38 #include <machine/asm.h> 39 #include <sys/syscall.h> 40 41 42 /* 43 * We define a hidden alias with the prefix "_libc_" for each global symbol 44 * that may be used internally. By referencing _libc_x instead of x, other 45 * parts of libc prevent overriding by the application and avoid unnecessary 46 * relocations. 47 */ 48 #define _HIDDEN(x) _libc_##x 49 #define _HIDDEN_ALIAS(x,y) \ 50 STRONG_ALIAS(_HIDDEN(x),y); \ 51 .hidden _HIDDEN(x) 52 #define _HIDDEN_FALIAS(x,y) \ 53 _HIDDEN_ALIAS(x,y); \ 54 .type _HIDDEN(x),#function 55 56 /* 57 * For functions implemented in ASM that aren't syscalls. 58 * END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names 59 * END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names 60 */ 61 #define END_STRONG(x) END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x)) 62 #define END_WEAK(x) END_STRONG(x); .weak x 63 64 65 #define SYSENTRY(x) \ 66 .weak _C_LABEL(x); \ 67 _C_LABEL(x) = _C_LABEL(_thread_sys_ ## x); \ 68 ENTRY(_thread_sys_ ## x) 69 #define SYSENTRY_HIDDEN(x) \ 70 ENTRY(_thread_sys_ ## x) 71 #define __END_HIDDEN(x) \ 72 END(_thread_sys_ ## x); \ 73 _HIDDEN_FALIAS(x, _thread_sys_ ## x); \ 74 END(_HIDDEN(x)) 75 #define __END(x) \ 76 __END_HIDDEN(x); END(x) 77 78 #define SYSTRAP(x) \ 79 ldr r12, =SYS_ ## x; \ 80 swi 0 81 82 #define CERROR _C_LABEL(__cerror) 83 84 #define _SYSCALL_NOERROR(x,y) \ 85 SYSENTRY(x); \ 86 SYSTRAP(y) 87 #define _SYSCALL_HIDDEN_NOERROR(x,y) \ 88 SYSENTRY_HIDDEN(x); \ 89 SYSTRAP(y) 90 91 #define _SYSCALL(x, y) \ 92 _SYSCALL_NOERROR(x,y); \ 93 bcs PIC_SYM(CERROR, PLT) 94 #define _SYSCALL_HIDDEN(x, y) \ 95 _SYSCALL_HIDDEN_NOERROR(x,y); \ 96 bcs PIC_SYM(CERROR, PLT) 97 98 #define SYSCALL_NOERROR(x) \ 99 _SYSCALL_NOERROR(x,x) 100 101 #define SYSCALL(x) \ 102 _SYSCALL(x,x) 103 104 105 #define PSEUDO_NOERROR(x,y) \ 106 _SYSCALL_NOERROR(x,y); \ 107 mov r15, r14; \ 108 __END(x) 109 110 #define PSEUDO(x,y) \ 111 _SYSCALL(x,y); \ 112 mov r15, r14; \ 113 __END(x) 114 #define PSEUDO_HIDDEN(x,y) \ 115 _SYSCALL_HIDDEN(x,y); \ 116 mov r15, r14; \ 117 __END_HIDDEN(x) 118 119 120 #define RSYSCALL_NOERROR(x) \ 121 PSEUDO_NOERROR(x,x) 122 123 #define RSYSCALL(x) \ 124 PSEUDO(x,x) 125 #define RSYSCALL_HIDDEN(x) \ 126 PSEUDO_HIDDEN(x,x) 127 #define SYSCALL_END(x) \ 128 __END(x) 129 #define SYSCALL_END_HIDDEN(x) \ 130 __END_HIDDEN(x) 131 132 .globl CERROR 133