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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [sysvi386/] [crt0.c] - Rev 816
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/*- * Copyright (c) 1990 The Regents of the University of California. * 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 by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)crt0.c 5.7 (Berkeley) 7/3/91"; #endif /* LIBC_SCCS and not lint */ /* * C start up routine. * Robert Henry, UCB, 20 Oct 81 * * We make the following (true) assumption: * 1) The only register variable that we can trust is ebp, * which points to the base of the kernel calling frame. */ char **environ = (char **)0; static int fd; /* asm(".text"); asm(".long 0xc000c000"); */ extern unsigned char etext; extern unsigned char eprol asm ("eprol"); /* extern start() asm("start"); */ _start(int arg) { struct kframe { int kargc; char *kargv[1]; /* size depends on kargc */ char kargstr[1]; /* size varies */ char kenvstr[1]; /* size varies */ }; /* * ALL REGISTER VARIABLES!!! */ register struct kframe *kfp; /* r10 */ register char **targv; register char **argv; extern int errno; extern void _mcleanup(); #ifdef lint kfp = 0; initcode = initcode = 0; #else not lint # if 0 asm("lea 4(%ebp),%ebx"); /* catch it quick */ # else kfp = (struct kframe *)&(((int *)(&arg))[-1]); # endif #endif not lint for (argv = targv = &kfp->kargv[0]; *targv++; /* void */) /* void */ ; if (targv >= (char **)(*argv)) --targv; environ = targv; asm("eprol:"); #ifdef paranoid /* * The standard I/O library assumes that file descriptors 0, 1, and 2 * are open. If one of these descriptors is closed prior to the start * of the process, I/O gets very confused. To avoid this problem, we * insure that the first three file descriptors are open before calling * main(). Normally this is undefined, as it adds two unnecessary * system calls. */ do { fd = open("/dev/null", 2); } while (fd >= 0 && fd < 3); close(fd); #endif paranoid #ifdef MCRT0 atexit(_mcleanup); monstartup(&eprol, &etext); #endif MCRT0 errno = 0; exit(main(kfp->kargc, argv, environ)); } #ifdef CRT0 /* * null mcount and moncontrol, * just in case some routine is compiled for profiling */ moncontrol(val) int val; { } asm(".globl mcount"); asm("mcount: ret"); #endif CRT0
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