1 /* LINTLIBRARY */ 2 /*- 3 * SPDX-License-Identifier: BSD-4-Clause 4 * 5 * Copyright 2001 David E. O'Brien. 6 * All rights reserved. 7 * Copyright 1996-1998 John D. Polstra. 8 * All rights reserved. 9 * Copyright (c) 1997 Jason R. Thorpe. 10 * Copyright (c) 1995 Christopher G. Demetriou 11 * All rights reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed for the 24 * FreeBSD Project. See https://www.freebsd.org/ for 25 * information about FreeBSD. 26 * This product includes software developed for the 27 * NetBSD Project. See http://www.netbsd.org/ for 28 * information about NetBSD. 29 * 4. The name of the author may not be used to endorse or promote products 30 * derived from this software without specific prior written permission 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 33 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 34 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 35 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 36 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 37 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 41 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <stdlib.h> 48 #include <stdint.h> 49 #include <sys/elf.h> 50 51 static uint32_t cpu_features; 52 static uint32_t cpu_features2; 53 54 #include "libc_private.h" 55 #include "ignore_init.c" 56 57 struct Struct_Obj_Entry; 58 struct ps_strings; 59 60 extern void _start(int, char **, char **, const struct Struct_Obj_Entry *, 61 void (*)(void), struct ps_strings *); 62 63 #ifdef GCRT 64 extern void _mcleanup(void); 65 extern void monstartup(void *, void *); 66 extern int eprol; 67 extern int etext; 68 #endif 69 70 struct ps_strings *__ps_strings; 71 72 static void 73 init_cpu_features(char **env) 74 { 75 const Elf_Auxinfo *aux; 76 77 /* Find the auxiliary vector on the stack. */ 78 while (*env++ != 0) /* Skip over environment, and NULL terminator */ 79 ; 80 aux = (const Elf_Auxinfo *)env; 81 82 /* Digest the auxiliary vector. */ 83 for (; aux->a_type != AT_NULL; aux++) { 84 switch (aux->a_type) { 85 case AT_HWCAP: 86 cpu_features = (uint32_t)aux->a_un.a_val; 87 break; 88 case AT_HWCAP2: 89 cpu_features2 = (uint32_t)aux->a_un.a_val; 90 break; 91 } 92 } 93 } 94 95 96 /* The entry function. */ 97 /* 98 * First 5 arguments are specified by the PowerPC SVR4 ABI. 99 * The last argument, ps_strings, is a BSD extension. 100 */ 101 /* ARGSUSED */ 102 void 103 _start(int argc, char **argv, char **env, 104 const struct Struct_Obj_Entry *obj __unused, void (*cleanup)(void), 105 struct ps_strings *ps_strings) 106 { 107 108 handle_argv(argc, argv, env); 109 110 if (ps_strings != (struct ps_strings *)0) 111 __ps_strings = ps_strings; 112 113 if (&_DYNAMIC != NULL) 114 atexit(cleanup); 115 else { 116 init_cpu_features(env); 117 process_irelocs(); 118 _init_tls(); 119 } 120 121 #ifdef GCRT 122 atexit(_mcleanup); 123 monstartup(&eprol, &etext); 124 #endif 125 126 handle_static_init(argc, argv, env); 127 exit(main(argc, argv, env)); 128 } 129 130 #ifdef GCRT 131 __asm__(".text"); 132 __asm__("eprol:"); 133 __asm__(".previous"); 134 #endif 135