boot/sparc/include/machine/stdarg.h

   1 /*      $OpenBSD: stdarg.h,v 1.4 1997/08/08 08:26:50 downsj Exp $       */
   2 /*      $NetBSD: stdarg.h,v 1.10 1996/12/27 20:55:28 pk Exp $ */
   3
   4 /*
   5  * Copyright (c) 1992, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This software was developed by the Computer Systems Engineering group
   9  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
  10  * contributed to Berkeley.
  11  *
  12  * All advertising materials mentioning features or use of this software
  13  * must display the following acknowledgement:
  14  *      This product includes software developed by the University of
  15  *      California, Lawrence Berkeley Laboratory.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  * 1. Redistributions of source code must retain the above copyright
  21  *    notice, this list of conditions and the following disclaimer.
  22  * 2. Redistributions in binary form must reproduce the above copyright
  23  *    notice, this list of conditions and the following disclaimer in the
  24  *    documentation and/or other materials provided with the distribution.
  25  * 3. All advertising materials mentioning features or use of this software
  26  *    must display the following acknowledgement:
  27  *      This product includes software developed by the University of
  28  *      California, Berkeley and its contributors.
  29  * 4. Neither the name of the University nor the names of its contributors
  30  *    may be used to endorse or promote products derived from this software
  31  *    without specific prior written permission.
  32  *
  33  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  34  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  35  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  36  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  37  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  38  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  39  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  41  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  42  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  43  * SUCH DAMAGE.
  44  *
  45  *      from: @(#)stdarg.h      8.2 (Berkeley) 9/27/93
  46  */
  47
  48 #ifndef _SPARC_STDARG_H_
  49 #define _SPARC_STDARG_H_
  50
  51 #include <machine/ansi.h>
  52
  53 #ifdef __lint__
  54 #define __extension__(x)                (0)
  55 #define __builtin_classify_type(t)      (0)
  56 #endif
  57
  58 typedef _BSD_VA_LIST_   va_list;
  59
  60 #define __va_size(type) \
  61         (((sizeof(type) + sizeof(long) - 1) / sizeof(long)) * sizeof(long))
  62
  63 #if __GNUC__ > 2 || __GNUC_MINOR__ >= 6
  64 #define va_start(ap, last) \
  65         (__builtin_next_arg(last), (ap) = (va_list)__builtin_saveregs())
  66 #else
  67 #define va_start(ap, last) \
  68         (__builtin_next_arg(), (ap) = (va_list)__builtin_saveregs())
  69 #endif
  70
  71 /*
  72  * va_arg picks up the next argument of type `type'.  Appending an
  73  * asterisk to `type' must produce a pointer to `type' (i.e., `type'
  74  * may not be, e.g., `int (*)()').
  75  *
  76  * Gcc-2.x tries to use ldd/std for double and quad_t values, but Sun's
  77  * brain-damaged calling convention does not quad-align these.  Thus, for
  78  * 8-byte arguments, we have to pick up the actual value four bytes at a
  79  * time, and use type punning (i.e., a union) to produce the result.
  80  * (We could also do this with a libc function, actually, by returning
  81  * 8 byte integers in %o0+%o1 and the same 8 bytes as a double in %f0+%f1.)
  82  *
  83  * Note: We don't declare __d with type `type', since in C++ the type might
  84  * have a constructor.
  85  */
  86 #if __GNUC__ == 1
  87 #define __extension__
  88 #endif
  89
  90 #define __va_8byte(ap, type) \
  91         __extension__ ({                                                \
  92                 union { char __d[sizeof(type)]; int __i[2]; } __va_u;   \
  93                 __va_u.__i[0] = ((int *)(void *)(ap))[0];               \
  94                 __va_u.__i[1] = ((int *)(void *)(ap))[1];               \
  95                 (ap) += 8; *(type *)(va_list)__va_u.__d;                \
  96         })
  97
  98 #define __va_arg(ap, type) \
  99         (*(type *)((ap) += __va_size(type),                     \
 100                    (ap) - (sizeof(type) < sizeof(long) &&       \
 101                            sizeof(type) != __va_size(type) ?    \
 102                            sizeof(type) : __va_size(type))))
 103
 104 #define __RECORD_TYPE_CLASS     12
 105 #define va_arg(ap, type) \
 106         (__builtin_classify_type(*(type *)0) >= __RECORD_TYPE_CLASS ?   \
 107          *__va_arg(ap, type *) : __va_size(type) == 8 ?                 \
 108          __va_8byte(ap, type) : __va_arg(ap, type))
 109
 110 #define va_end(ap)      ((void)0)
 111
 112 #endif /* !_SPARC_STDARG_H_ */
 113