Sparc64 ELF version of the C runtime support.

It tries to comply with the SCD 2.4.1 (and thus Sparc 64-bit psABI).

This is an amalgamation of the FreeBSD Alpha crt1.c and the BSD/OS Sparc
crt0.c (which the copyright reflects).

lib/csu/sparc64/crt1.c

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2001 David E. O'Brien
+ * All rights reserved.
+ * Copyright (c) 1995, 1998 Berkeley Software Design, Inc.
+ * All rights reserved.
+ * Copyright 1996-1998 John D. Polstra.
+ * 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. The name of the authors may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __GNUC__
+#error "GCC is needed to compile this file"
+#endif
+
+#include <stdlib.h>
+#include "crtbrand.c"
+
+struct Struct_Obj_Entry;
+struct ps_strings;
+
+#pragma weak _DYNAMIC
+extern int _DYNAMIC;
+
+extern void _init(void);
+extern void _fini(void);
+extern int main(int, char **, char **);
+
+#ifdef GCRT
+extern void _mcleanup(void);
+extern void monstartup(void *, void *);
+extern int eprol;
+extern int etext;
+#endif
+
+char **environ;
+char *__progname = "";
+
+/* The entry function. */
+ *
+ * %o0 holds ps_strings pointer.  For Solaris compat and/or shared
+ * libraries, if %g1 is not 0, it is a routine to pass to atexit().
+ * (By passing the pointer in the usual argument register, we avoid
+ * having to do any inline assembly, except to recover %g1.)
+ *
+ * Note: kernel may (is not set in stone yet) pass ELF aux vector in %o1,
+ * but for now we do not use it here.
+ */
+void
+_start(char **ap,
+	void (*cleanup)(void),			/* from shared loader */
+	struct Struct_Obj_Entry *obj,		/* from shared loader */
+	struct ps_strings *ps_strings)
+{
+	int argc;
+	char **argv;
+	char **env;
+	void (*term)(void);	
+
+	/* Grab %g1 before it gets used for anything by the compiler. */
+	/* Sparc ELF psABI specifies a termination routine (if any) will be in
+	   %g1 */
+	__asm__ volatile("mov %%g1,%0" : "=r"(term));
+
+	argc = * (long *) ap;
+	argv = ap + 1;
+	env  = ap + 2 + argc;
+	environ = env;
+	if(argc > 0 && argv[0] != NULL) {
+		char *s;
+		__progname = argv[0];
+		for (s = __progname; *s != '\0'; s++)
+			if (*s == '/')
+				__progname = s + 1;
+	}
+
+	/*
+	 * If the kernel or a shared library wants us to call
+	 * a termination function, arrange to do so.
+	 */
+	if (term)
+		atexit(term);
+
+	if (&_DYNAMIC != NULL)
+		atexit(cleanup);
+
+#ifdef GCRT
+	atexit(_mcleanup);
+#endif
+	atexit(_fini);
+#ifdef GCRT
+	monstartup(&eprol, &etext);
+#endif
+	_init();
+	exit( main(argc, argv, env) );
+}
+
+#ifdef GCRT
+__asm__(".text");
+__asm__("eprol:");
+__asm__(".previous");
+#endif
+
+/*
+ * NOTE: Leave the RCS ID _after_ __start(), in case it gets placed in .text.
+ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");