1 /* $OpenBSD: DEFS.h,v 1.1 2020/06/25 01:59:27 drahn Exp $ */ 2 3 /*- 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 * $NetBSD: SYS.h,v 1.5 2002/06/03 18:30:32 fvdl Exp $ 36 */ 37 38 #include <machine/asm.h> 39 40 /* 41 * We define a hidden alias with the prefix "_libc_" for each global symbol 42 * that may be used internally. By referencing _libc_x instead of x, other 43 * parts of libc prevent overriding by the application and avoid unnecessary 44 * relocations. 45 */ 46 #define _HIDDEN(x) _libc_##x 47 #define _HIDDEN_ALIAS(x,y) \ 48 STRONG_ALIAS(_HIDDEN(x),y); \ 49 .hidden _HIDDEN(x) 50 #define _HIDDEN_FALIAS(x,y) \ 51 _HIDDEN_ALIAS(x,y); \ 52 .type _HIDDEN(x),@function 53 54 /* 55 * For functions implemented in ASM that aren't syscalls. 56 * END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names 57 * END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names 58 * END_BUILTIN(x) If compiling with clang, then just END() and 59 * mark it .protected, else be like END_STRONG(); 60 * for clang builtins like memcpy 61 */ 62 #define END_STRONG(x) END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x)) 63 #define END_WEAK(x) END_STRONG(x); .weak x 64 65 #ifdef __clang__ 66 #define END_BUILTIN(x) END(x); .protected x 67 #else 68 #define END_BUILTIN(x) END_STRONG(x) 69 #endif 70