BSD 4_4 release

[unix-history] / usr / src / lib / libc / vax / gen / alloca.s

diff --git a/usr/src/lib/libc/vax/gen/alloca.s b/usr/src/lib/libc/vax/gen/alloca.s
index 721e41b..5996ba4 100644 (file)
--- a/usr/src/lib/libc/vax/gen/alloca.s
+++ b/usr/src/lib/libc/vax/gen/alloca.s
@@ -1,22 +1,49 @@
-/*
- * Copyright (c) 1980 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+/*-
+ * Copyright (c) 1991, 1993
+ *     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.

  */
 
  */
 

-#ifdef LIBC_SCCS
-       .asciz  "@(#)alloca.s   5.3 (Berkeley) 3/9/86"
-#endif LIBC_SCCS
-
-/* like alloc, but automatic free in return */
+#if defined(LIBC_SCCS) && !defined(lint)
+       .asciz "@(#)alloca.s    8.1 (Berkeley) 6/4/93"
+#endif /* LIBC_SCCS and not lint */

 
 #include "DEFS.h"
 
 ENTRY(alloca, 0)
 
 #include "DEFS.h"
 
 ENTRY(alloca, 0)

-       subl2   4(ap),sp        /* crude allocation */
-       movl    16(fp),r1       /* pc */
-       movq    8(fp),ap        /* new (old) ap and fp */
-       bicl2   $3,sp           /* 4-byte align */
-       addl2   $7*4,sp         /* reuse space of mscp */
-       movl    sp,r0           /* return value */
-       jmp     (r1)            /* funny return */
+       movl    4(ap),r0        # get allocation size
+       movl    16(fp),r2       # save return address before we smash it
+       movab   here,16(fp)
+       ret
+here:
+       subl2   r0,sp           # create stack space
+       bicl2   $3,sp           # align to longword boundary
+       movl    sp,r0
+       jmp     (r2)