e83f7ba2c9
. file- and functionality-compatible with previous situation
(FreeBSD csu) (with a crt1.o -> crt0.o symlink in /usr/lib)
. harmonizes source with netbsd
. harmonizes linker invocation (e.g. clang) with netbsd
. helpful to get some arm code in there for the arm port project
138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/* $NetBSD: crt0-common.c,v 1.1 2010/08/07 18:01:33 joerg Exp $ */
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/*
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* Copyright (c) 1998 Christos Zoulas
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* Copyright (c) 1995 Christopher G. Demetriou
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the
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* NetBSD Project. See http://www.NetBSD.org/ for
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* information about NetBSD.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: crt0-common.c,v 1.1 2010/08/07 18:01:33 joerg Exp $");
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#include <sys/types.h>
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#ifndef __minix
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#include <sys/syscall.h>
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#endif
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#include <machine/profile.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "rtld.h"
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extern int main(int, char **, char **);
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extern void _init(void);
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extern void _fini(void);
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/*
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* Arrange for _DYNAMIC to be weak and undefined (and therefore to show up
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* as being at address zero, unless something else defines it). That way,
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* if we happen to be compiling without -static but with without any
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* shared libs present, things will still work.
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*/
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#if __GNUC_PREREQ__(4,2)
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static int rtld_DYNAMIC __attribute__((__weakref__, __alias__("_DYNAMIC")));
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#define DYNAMIC_SYM rtld_DYNAMIC
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#else
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extern int _DYNAMIC __weak_reference(_DYNAMIC);
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#define DYNAMIC_SYM _DYNAMIC
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#endif
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#ifdef MCRT0
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extern void monstartup(u_long, u_long);
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extern void _mcleanup(void);
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extern unsigned char __etext, __eprol;
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#endif /* MCRT0 */
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char **environ;
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struct ps_strings *__ps_strings = 0;
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static char empty_string[] = "";
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char *__progname = empty_string;
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void ___start(int, char **, char **, void (*)(void),
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const Obj_Entry *, struct ps_strings *);
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#ifndef __minix
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#define write(fd, s, n) __syscall(SYS_write, (fd), (s), (n))
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#else
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#define write(fd, s, n) /* NO write() from here on minix */
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#endif
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#define _FATAL(str) \
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do { \
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write(2, str, sizeof(str)-1); \
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_exit(1); \
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} while (0)
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void
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___start(int argc, char **argv, char **envp,
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void (*cleanup)(void), /* from shared loader */
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const Obj_Entry *obj, /* from shared loader */
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struct ps_strings *ps_strings)
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{
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environ = envp;
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if (argv[0] != NULL) {
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char *c;
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__progname = argv[0];
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for (c = argv[0]; *c; ++c) {
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if (*c == '/')
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__progname = c + 1;
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}
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} else {
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__progname = empty_string;
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}
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if (ps_strings != NULL)
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__ps_strings = ps_strings;
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if (&DYNAMIC_SYM != NULL) {
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if ((obj == NULL) || (obj->magic != RTLD_MAGIC))
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_FATAL("Corrupt Obj_Entry pointer in GOT\n");
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if (obj->version != RTLD_VERSION)
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_FATAL("Dynamic linker version mismatch\n");
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atexit(cleanup);
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}
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#ifdef MCRT0
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atexit(_mcleanup);
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monstartup((u_long)&__eprol, (u_long)&__etext);
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#endif
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atexit(_fini);
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_init();
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exit(main(argc, argv, environ));
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}
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