lib/libc/arch/x86_64/gen/alloca.S

   1 /*      $NetBSD$        */
   2
   3 #include <machine/asm.h>
   4
   5 #if defined(LIBC_SCCS)
   6         RCSID("$NetBSD: alloca.S,v 1.5 1997/07/16 14:37:14 christos Exp $")
   7 #endif
   8
   9 ENTRY(alloca)
  10         popq    %rdx
  11         movq    %rsp,%rcx
  12         addq    $15,%rdi        /*  round up to 16 bytes */
  13         andq    $~15,%rdi
  14         subq    %rdi,%rsp
  15         movq    %rsp,%rax
  16         jmp     *%rdx