/*- * Copyright (c) 1991 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. */ #ifndef lint static char sccsid[] = "@(#)crt0.c 5.3 (Berkeley) 5/22/91"; #endif /* not lint */ /* * C start up routine. * Robert Henry, UCB, 20 Oct 81 * * We make the following (true) assumptions: * 1) When the kernel calls start, it does a jump to location 2, * and thus avoids the register save mask. We are NOT called * with a calls! * 2) The only register variable that we can trust is sp, * which points to the base of the kernel calling frame. */ char **environ = (char **)0; static int fd; extern unsigned char etext; extern unsigned char eprol asm ("eprol"); extern start() asm("start"); /* * Some kluges: store sp at entry in environ, and * install 16 bits of 0 at location 0 (a zero register save mask). * These two hacks remove limits on the use of local * and register variables in start(). * The reason for using 'moval (sp),...' is that 'movl sp,...' generates * a privileged instruction trap (argh). * XXX 'addl3 $start,$2,r0; jmp (r0)' should be replaced with * XXX 'jbr start+2' when we convert over to gas. */ asm(".text; .word 0; moval (sp),_environ; addl3 $start,$2,r0; jmp (r0)"); start() { struct kframe { int kargc; char *kargv[1]; /* size depends on kargc */ char kargstr[1]; /* size varies */ char kenvstr[1]; /* size varies */ }; register struct kframe *kfp; register char **targv; register char **argv; extern int errno; kfp = (struct kframe *) environ; for (argv = targv = &kfp->kargv[0]; *targv++; /* void */) /* void */ ; if (targv >= (char **)(*argv)) --targv; environ = targv; asm("eprol:"); #ifdef MCRT0 monstartup(&eprol, &etext); #endif MCRT0 errno = 0; exit(main(kfp->kargc, argv, environ)); } #ifdef MCRT0 /*ARGSUSED*/ exit(code) register int code; { _mcleanup(); _cleanup(); _exit(code); } #endif MCRT0 #ifdef CRT0 /* * null mcount and moncontrol, * just in case some routine is compiled for profiling */ moncontrol(val) int val; { } mcount() { } #endif CRT0