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/* $NetBSD: crt0-common.c,v 1.13 2013/01/31 22:24:25 matt 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 1.13 2013/01/31 22:24:25 matt Exp $");
#include <sys/types.h>
#include <sys/exec.h>
#if !defined(__minix)
#include <sys/syscall.h>
#else
#include <string.h>
#endif /* !defined(__minix) */
#include <machine/profile.h>
#include <stdlib.h>
#include <unistd.h>
#include "rtld.h"
extern int main(int, char **, char **);
#ifndef HAVE_INITFINI_ARRAY
extern void _init(void);
extern void _fini(void);
#endif
extern void _libc_init(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.
*/
__weakref_visible int rtld_DYNAMIC __weak_reference(_DYNAMIC);
#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;
__dead __dso_hidden void ___start(void (*)(void), const Obj_Entry *,
struct ps_strings *);
#if !defined(__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 /* !defined(__minix) */
#define _FATAL(str) \
do { \
write(2, str, sizeof(str)-1); \
_exit(1); \
} while (0)
#ifdef HAVE_INITFINI_ARRAY
/*
* If we are using INIT_ARRAY/FINI_ARRAY and we are linked statically,
* we have to process these instead of relying on RTLD to do it for us.
*
* Since we don't need .init or .fini sections, just code them in C
* to make life easier.
*/
__weakref_visible const fptr_t preinit_array_start[1]
__weak_reference(__preinit_array_start);
__weakref_visible const fptr_t preinit_array_end[1]
__weak_reference(__preinit_array_end);
__weakref_visible const fptr_t init_array_start[1]
__weak_reference(__init_array_start);
__weakref_visible const fptr_t init_array_end[1]
__weak_reference(__init_array_end);
__weakref_visible const fptr_t fini_array_start[1]
__weak_reference(__fini_array_start);
__weakref_visible const fptr_t fini_array_end[1]
__weak_reference(__fini_array_end);
static inline void
_preinit(void)
{
for (const fptr_t *f = preinit_array_start; f < preinit_array_end; f++) {
(*f)();
}
}
static inline void
_init(void)
{
for (const fptr_t *f = init_array_start; f < init_array_end; f++) {
(*f)();
}
}
static void
_fini(void)
{
for (const fptr_t *f = fini_array_start; f < fini_array_end; f++) {
(*f)();
}
}
#endif /* HAVE_INITFINI_ARRAY */
void
___start(void (*cleanup)(void), /* from shared loader */
const Obj_Entry *obj, /* from shared loader */
struct ps_strings *ps_strings)
{
if (ps_strings == NULL)
_FATAL("ps_strings missing\n");
__ps_strings = ps_strings;
environ = ps_strings->ps_envstr;
if (ps_strings->ps_argvstr[0] != NULL) {
char *c;
__progname = ps_strings->ps_argvstr[0];
for (c = ps_strings->ps_argvstr[0]; *c; ++c) {
if (*c == '/')
__progname = c + 1;
}
} else {
__progname = empty_string;
}
if (&rtld_DYNAMIC != NULL) {
if (obj == NULL)
_FATAL("NULL Obj_Entry pointer in GOT\n");
if (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);
}
_libc_init();
#ifdef HAVE_INITFINI_ARRAY
_preinit();
#endif
#ifdef MCRT0
atexit(_mcleanup);
monstartup((u_long)&__eprol, (u_long)&__etext);
#endif
atexit(_fini);
_init();
exit(main(ps_strings->ps_nargvstr, ps_strings->ps_argvstr, environ));
}
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