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/* $OpenBSD: crt0.c,v 1.4 2003/12/25 23:26:09 miod Exp $ */
/*
* Mach Operating System
* Copyright (c) 1991, 1992 Carnegie Mellon University
* Copyright (c) 1991, 1992 Omron Corporation
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: crt0.c,v 1.4 2003/12/25 23:26:09 miod Exp $";
#endif /* LIBC_SCCS and not lint */
/*
* When a program starts, r31 points to a structure passed from the kernel.
*
* This structure contains argc, the argv[] array, a NULL marker, then
* the envp[] array, and another NULL marker.
*/
#include <stdlib.h>
#include "common.h"
extern void start(void) __asm__("start");
void
start(void)
{
struct kframe {
int argc;
char *argv[0];
};
struct kframe *kfp;
char **argv, *ap, *s;
/*
* Pick the arguments frame as early as possible
*/
__asm__ __volatile__ ("or %0, r31, 0" : "=r" (kfp) :: "r31");
argv = &kfp->argv[0];
environ = argv + kfp->argc + 1;
if (ap = argv[0]) {
if ((__progname = _strrchr(ap, '/')) == NULL)
__progname = ap;
else
++__progname;
for (s = __progname_storage; *__progname &&
s < &__progname_storage[sizeof __progname_storage - 1]; )
*s++ = *__progname++;
*s = '\0';
__progname = __progname_storage;
}
asm ("__callmain:"); /* Defined for the benefit of debuggers */
exit(main(kfp->argc, argv, environ));
}
#include "common.c"
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