1 /* $NetBSD: crt0-common.c,v 1.5 2011/03/07 05:09:09 joerg Exp $ */ 2 3 /* 4 * Copyright (c) 1998 Christos Zoulas 5 * Copyright (c) 1995 Christopher G. Demetriou 6 * All rights reserved. 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed for the 19 * NetBSD Project. See http://www.NetBSD.org/ for 20 * information about NetBSD. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 * 35 * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>> 36 */ 37 38 #include <sys/cdefs.h> 39 __RCSID("$NetBSD: crt0-common.c,v 1.5 2011/03/07 05:09:09 joerg Exp $"); 40 41 #include <sys/types.h> 42 #include <sys/syscall.h> 43 #include <machine/profile.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 #include "rtld.h" 48 49 extern int main(int, char **, char **); 50 51 extern void _init(void); 52 extern void _fini(void); 53 extern void _libc_init(void); 54 55 /* 56 * Arrange for _DYNAMIC to be weak and undefined (and therefore to show up 57 * as being at address zero, unless something else defines it). That way, 58 * if we happen to be compiling without -static but with without any 59 * shared libs present, things will still work. 60 */ 61 62 __weakref_visible int rtld_DYNAMIC __weak_reference(_DYNAMIC); 63 64 #ifdef MCRT0 65 extern void monstartup(u_long, u_long); 66 extern void _mcleanup(void); 67 extern unsigned char __etext, __eprol; 68 #endif /* MCRT0 */ 69 70 char **environ; 71 struct ps_strings *__ps_strings = 0; 72 73 static char empty_string[] = ""; 74 char *__progname = empty_string; 75 76 void ___start(int, char **, char **, void (*)(void), 77 const Obj_Entry *, struct ps_strings *); 78 79 #define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n)) 80 81 #define _FATAL(str) \ 82 do { \ 83 write(2, str, sizeof(str)-1); \ 84 _exit(1); \ 85 } while (0) 86 87 void 88 ___start(int argc, char **argv, char **envp, 89 void (*cleanup)(void), /* from shared loader */ 90 const Obj_Entry *obj, /* from shared loader */ 91 struct ps_strings *ps_strings) 92 { 93 environ = envp; 94 95 if (argv[0] != NULL) { 96 char *c; 97 __progname = argv[0]; 98 for (c = argv[0]; *c; ++c) { 99 if (*c == '/') 100 __progname = c + 1; 101 } 102 } else { 103 __progname = empty_string; 104 } 105 106 if (ps_strings != NULL) 107 __ps_strings = ps_strings; 108 109 if (&rtld_DYNAMIC != NULL) { 110 if (obj == NULL) 111 _FATAL("NULL Obj_Entry pointer in GOT\n"); 112 if (obj->magic != RTLD_MAGIC) 113 _FATAL("Corrupt Obj_Entry pointer in GOT\n"); 114 if (obj->version != RTLD_VERSION) 115 _FATAL("Dynamic linker version mismatch\n"); 116 atexit(cleanup); 117 } 118 119 _libc_init(); 120 121 #ifdef MCRT0 122 atexit(_mcleanup); 123 monstartup((u_long)&__eprol, (u_long)&__etext); 124 #endif 125 126 atexit(_fini); 127 _init(); 128 129 exit(main(argc, argv, environ)); 130 } 131