1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Ralph Campbell. 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 1.12 2016/05/07 19:05:22 guenther Exp $ 33 */ 34 35 #include <sys/syscall.h> 36 #include <machine/asm.h> 37 38 /* 39 * We define a hidden alias with the prefix "_libc_" for each global symbol 40 * that may be used internally. By referencing _libc_x instead of x, other 41 * parts of libc prevent overriding by the application and avoid unnecessary 42 * relocations. 43 */ 44 #define _HIDDEN(x) _libc_##x 45 #define _HIDDEN_ALIAS(x,y) \ 46 STRONG_ALIAS(_HIDDEN(x),y); \ 47 .hidden _HIDDEN(x) 48 #define _HIDDEN_FALIAS(x,y) \ 49 _HIDDEN_ALIAS(x,y); \ 50 .type _HIDDEN(x),@function 51 52 /* 53 * For functions implemented in ASM that aren't syscalls. 54 * END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names 55 * END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names 56 */ 57 #define END_STRONG(x) END(x); \ 58 _HIDDEN_FALIAS(x,x); \ 59 .size _HIDDEN(x), . - _HIDDEN(x) 60 #define END_WEAK(x) END_STRONG(x); .weak x 61 62 63 #define CERROR __cerror 64 .hidden CERROR 65 66 # define __ENTRY(p,x) ENTRY(p ## x) 67 68 # define __DO_SYSCALL(x) \ 69 li v0,SYS_ ## x; \ 70 syscall 71 72 # define __LEAF2(p,x,sz) LEAF(p ## x, sz) \ 73 WEAK_ALIAS(x, p ## x); 74 75 # define __END2_HIDDEN(p,x) END(p ## x); \ 76 _HIDDEN_FALIAS(x, p ## x); \ 77 .size _HIDDEN(x), . - _HIDDEN(x) 78 # define __END2(p,x) __END2_HIDDEN(p,x); \ 79 .size x, . - x 80 81 #define __PSEUDO_NOERROR(p,x,y) \ 82 __LEAF2(p,x, 0); \ 83 __DO_SYSCALL(y); \ 84 j ra; \ 85 __END2(p,x) 86 87 #define __PSEUDO(p,x,y) \ 88 __LEAF2(p,x,32); \ 89 PTR_SUBU sp,32; \ 90 SETUP_GP64(16,_HIDDEN(x)); \ 91 __DO_SYSCALL(y); \ 92 bne a3,zero,1f; \ 93 RESTORE_GP64; \ 94 PTR_ADDU sp,32; \ 95 j ra; \ 96 1: LA t9,CERROR; \ 97 RESTORE_GP64; \ 98 PTR_ADDU sp,32; \ 99 jr t9; \ 100 __END2(p,x) 101 #define __PSEUDO_HIDDEN(p,x,y) \ 102 LEAF(p ## x,32); \ 103 PTR_SUBU sp,32; \ 104 SETUP_GP64(16,_HIDDEN(x)); \ 105 __DO_SYSCALL(y); \ 106 bne a3,zero,1f; \ 107 RESTORE_GP64; \ 108 PTR_ADDU sp,32; \ 109 j ra; \ 110 1: LA t9,CERROR; \ 111 RESTORE_GP64; \ 112 PTR_ADDU sp,32; \ 113 jr t9; \ 114 __END2_HIDDEN(p,x) 115 116 117 #define RSYSCALL(x) __PSEUDO(_thread_sys_,x,x) 118 #define RSYSCALL_HIDDEN(x) __PSEUDO_HIDDEN(_thread_sys_,x,x) 119 #define PSEUDO(x,y) __PSEUDO(_thread_sys_,x,y) 120 #define PSEUDO_NOERROR(x,y) __PSEUDO_NOERROR(_thread_sys_,x,y) 121 122 #define SYSLEAF(x, sz) __LEAF2(_thread_sys_,x, sz) 123 #define SYSLEAF_HIDDEN(x, sz) LEAF(_thread_sys_ ## x, sz) 124 #define SYSCALL_END(x) __END2(_thread_sys_,x) 125 #define SYSCALL_END_HIDDEN(x) __END2_HIDDEN(_thread_sys_,x) 126 127