minix/lib/csu/common/crt0-common.c
Ben Gras e83f7ba2c9 switch to netbsd csu
. 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
2012-04-12 13:26:24 +02:00

137 lines
4.1 KiB
C

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