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128 lines
3.8 KiB
C
128 lines
3.8 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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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 by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)crt0.c 5.7 (Berkeley) 7/3/91";
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#endif /* LIBC_SCCS and not lint */
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/*
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* C start up routine.
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* Robert Henry, UCB, 20 Oct 81
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*
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* We make the following (true) assumption:
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* 1) The only register variable that we can trust is ebp,
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* which points to the base of the kernel calling frame.
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*/
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char **environ = (char **)0;
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static int fd;
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/*
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asm(".text");
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asm(".long 0xc000c000");
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*/
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extern unsigned char etext;
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extern unsigned char eprol asm ("eprol");
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/* extern start() asm("start"); */
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_start(int arg)
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{
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struct kframe {
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int kargc;
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char *kargv[1]; /* size depends on kargc */
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char kargstr[1]; /* size varies */
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char kenvstr[1]; /* size varies */
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};
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/*
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* ALL REGISTER VARIABLES!!!
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*/
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register struct kframe *kfp; /* r10 */
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register char **targv;
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register char **argv;
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extern int errno;
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extern void _mcleanup();
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#ifdef lint
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kfp = 0;
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initcode = initcode = 0;
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#else not lint
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# if 0
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asm("lea 4(%ebp),%ebx"); /* catch it quick */
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# else
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kfp = (struct kframe *)&(((int *)(&arg))[-1]);
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# endif
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#endif not lint
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for (argv = targv = &kfp->kargv[0]; *targv++; /* void */)
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/* void */ ;
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if (targv >= (char **)(*argv))
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--targv;
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environ = targv;
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asm("eprol:");
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#ifdef paranoid
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/*
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* The standard I/O library assumes that file descriptors 0, 1, and 2
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* are open. If one of these descriptors is closed prior to the start
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* of the process, I/O gets very confused. To avoid this problem, we
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* insure that the first three file descriptors are open before calling
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* main(). Normally this is undefined, as it adds two unnecessary
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* system calls.
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*/
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do {
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fd = open("/dev/null", 2);
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} while (fd >= 0 && fd < 3);
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close(fd);
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#endif paranoid
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#ifdef MCRT0
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atexit(_mcleanup);
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monstartup(&eprol, &etext);
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#endif MCRT0
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errno = 0;
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exit(main(kfp->kargc, argv, environ));
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}
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#ifdef CRT0
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/*
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* null mcount and moncontrol,
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* just in case some routine is compiled for profiling
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*/
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moncontrol(val)
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int val;
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{
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}
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asm(".globl mcount");
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asm("mcount: ret");
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#endif CRT0
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