diff options
author | obrien <obrien@FreeBSD.org> | 2003-05-01 16:04:38 +0000 |
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committer | obrien <obrien@FreeBSD.org> | 2003-05-01 16:04:38 +0000 |
commit | f98a708c206b89dde63653a672a3dc74e421df80 (patch) | |
tree | 9e344f33cde0eee79c68e95c221ca886047d8cd8 /lib/libc/amd64 | |
parent | 46c06a0c428abfad163803a5b50ecb38b7afda6e (diff) | |
download | FreeBSD-src-f98a708c206b89dde63653a672a3dc74e421df80.zip FreeBSD-src-f98a708c206b89dde63653a672a3dc74e421df80.tar.gz |
Convert the i386 alloca(3) to the x86-64 ISA.
Alignment hack from: NetBSD
Diffstat (limited to 'lib/libc/amd64')
-rw-r--r-- | lib/libc/amd64/gen/alloca.S | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/lib/libc/amd64/gen/alloca.S b/lib/libc/amd64/gen/alloca.S new file mode 100644 index 0000000..e3c7794 --- /dev/null +++ b/lib/libc/amd64/gen/alloca.S @@ -0,0 +1,53 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * 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) + .asciz "@(#)alloca.s 5.2 (Berkeley) 5/14/90" +#endif /* LIBC_SCCS and not lint */ +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + + +/* like alloc, but automatic automatic free in return */ + +ENTRY(alloca) + popq %rdx /* pop return addr */ + movl %rsp,%rcx + addq $15,%rdi /* round amount to allocate up to 16 bytes */ + andq $~15,%rdi + subq %rdi,%rsp + movq %rsp,%rax /* base of newly allocated space */ + jmp *%rdx /* "return" */ |