1 /* $OpenBSD: DEFS.h,v 1.2 2023/12/13 09:01:25 miod Exp $ */ 2 3 /* 4 * Copyright (c) 1998-2002 Michael Shalayeff 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF MIND 22 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <machine/asm.h> 29 30 #define END(x) EXIT(x) 31 32 /* 33 * We define a hidden alias with the prefix "_libc_" for each global symbol 34 * that may be used internally. By referencing _libc_x instead of x, other 35 * parts of libc prevent overriding by the application and avoid unnecessary 36 * relocations. 37 */ 38 #define _HIDDEN(x) _libc_##x 39 #define _HIDDEN_ALIAS(x,y) \ 40 STRONG_ALIAS(_HIDDEN(x),y) !\ 41 .hidden _HIDDEN(x) 42 #define _HIDDEN_FALIAS(x,y) \ 43 _HIDDEN_ALIAS(x,y) !\ 44 .type _HIDDEN(x),@function 45 46 /* 47 * For functions implemented in ASM that aren't syscalls. 48 * END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names 49 * END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names 50 * ALTEND_STRONG(x) and ALTEND_WEAK() 51 * Matching macros for ALTENTRY functions 52 * END_BUILTIN(x) If compiling with clang, then just END() and 53 * mark it .protected, else be like END_STRONG(); 54 * for clang builtins like memcpy 55 * 56 * If a 'BUILTIN' function needs be referenced by other ASM code, then use 57 * _BUILTIN(x) If compiled with clang, then just x, otherwise 58 * _HIDDEN(x) 59 * 60 * _END(x) Set a size on a symbol, like END(), but even for 61 * symbols with no matching ENTRY(). (On alpha and 62 * mips64, END() generates .end which requires a 63 * matching .ent from ENTRY()) 64 */ 65 #define END_STRONG(x) END(x) ! _HIDDEN_FALIAS(x,x) ! _END(_HIDDEN(x)) 66 #define END_WEAK(x) END_STRONG(x) ! .weak x 67 #define ALTEND_STRONG(x) _HIDDEN_FALIAS(x,x) ! _END(_HIDDEN(x)) 68 #define ALTEND_WEAK(x) ALTEND_STRONG(x) ! .weak x 69 70 #ifdef __clang__ 71 #define END_BUILTIN(x) END(x) ! .protected x 72 #define _BUILTIN(x) x 73 #else 74 #define END_BUILTIN(x) END_STRONG(x) 75 #define _BUILTIN(x) _HIDDEN(x) 76 #endif 77 78 #define _END(x) .size x, . - x 79 80 #define PINSYSCALL(sysno, label) \ 81 .pushsection .openbsd.syscalls,"",@progbits !\ 82 .p2align 2 !\ 83 .long label !\ 84 .long sysno !\ 85 .popsection 86