386BSD 0.1 development

Work on file usr/src/lib/csu.i386/crt0.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/src/lib/csu.i386/crt0.c b/usr/src/lib/csu.i386/crt0.c
new file mode 100644 (file)
index 0000000..363098b
--- /dev/null
+++ b/usr/src/lib/csu.i386/crt0.c
@@ -0,0 +1,108 @@
+/*-
+ * 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 the frame pointer,
+ *     ebp, which points to the base of the kernel calling frame.
+ */
+
+char   **environ = (char **)0;
+int    errno = 0;
+
+asm(".text");
+asm(".long 0xc000c000");
+
+extern unsigned char   etext;
+extern unsigned char   eprol asm ("eprol");
+extern                 start() asm("start");
+extern                 mcount() asm ("mcount");
+
+start()
+{
+       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;
+       register char **targv;
+       register char **argv;
+       extern void _mcleanup();
+
+#ifdef lint
+       kfp = 0;
+       initcode = initcode = 0;
+#else not lint
+       /* just above the saved frame pointer */
+       asm ("lea 4(%%ebp), %0" : "=r" (kfp) );
+#endif not lint
+       for (argv = targv = &kfp->kargv[0]; *targv++; /* void */)
+               /* void */ ;
+       if (targv >= (char **)(*argv))
+               --targv;
+       environ = targv;
+asm("eprol:");
+
+#ifdef MCRT0
+       atexit(_mcleanup);
+       monstartup(&eprol, &etext);
+#endif MCRT0
+       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;
+{
+
+}
+
+mcount() { }
+#endif CRT0