126 lines
3.7 KiB
C
126 lines
3.7 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 the frame pointer,
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* ebp, which points to the base of the kernel calling frame.
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*/
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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char **environ = (char **)0;
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static char empty[1];
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char *__progname = empty;
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int errno = 0;
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asm(".text");
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asm(".long 0xc000c000");
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#if 1 /* more needed for alignment on i486/gcc-2.3.3 */
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asm(".long 0xc000c000");
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asm(".long 0xc000c000");
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asm(".long 0xc000c000");
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#endif
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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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extern mcount() asm ("mcount");
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start()
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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;
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register char **targv;
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register char **argv;
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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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/* just above the saved frame pointer */
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asm ("lea 4(%%ebp), %0" : "=r" (kfp) );
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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 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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if (argv[0])
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if ((__progname = strrchr(argv[0], '/')) == NULL)
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__progname = argv[0];
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else
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++__progname;
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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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mcount() { }
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#endif CRT0
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