sys/arch/sparc/include/stdarg.h

   1 /*      $NetBSD: stdarg.h,v 1.19.2.5 2005/11/10 13:58:56 skrll Exp $ */
   2
   3 /*
   4  * Copyright (c) 1992, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This software was developed by the Computer Systems Engineering group
   8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   9  * contributed to Berkeley.
  10  *
  11  * All advertising materials mentioning features or use of this software
  12  * must display the following acknowledgement:
  13  *      This product includes software developed by the University of
  14  *      California, Lawrence Berkeley Laboratory.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      from: @(#)stdarg.h      8.2 (Berkeley) 9/27/93
  41  */
  42
  43 #ifndef _SPARC_STDARG_H_
  44 #define _SPARC_STDARG_H_
  45
  46 #include <machine/ansi.h>
  47 #include <sys/featuretest.h>
  48
  49 typedef _BSD_VA_LIST_   va_list;
  50
  51 #ifdef __lint__
  52
  53 # define va_start(ap, last)     ((ap) = *(va_list *)0)
  54 # define va_arg(ap, type)       (*(type *)(void *)&(ap))
  55 # define va_end(ap)
  56 # define __va_copy(dest, src)   ((dest) = (src))
  57
  58 #elif __GNUC_PREREQ__(3,0)
  59
  60 # define va_start(ap, last)     __builtin_va_start(ap, last)
  61 # define va_end(ap)             __builtin_va_end(ap)
  62 # define va_arg(ap, type)       __builtin_va_arg(ap, type)
  63 # define __va_copy(dst, src)    __builtin_va_copy(dst, src)
  64
  65 #else
  66
  67 # define va_start(ap, last) \
  68         (void)(__builtin_next_arg(last), (ap) = (va_list)__builtin_saveregs())
  69
  70
  71 # define va_end(ap)
  72 # define __va_copy(dest, src) \
  73         ((dest) = (src))
  74
  75 # ifdef __arch64__
  76 /*
  77  * For sparcv9 code.
  78  */
  79 #  define __va_arg8(ap, type) \
  80         (*(type *)(void *)((ap) += 8, (ap) - 8))
  81 #  define __va_arg16(ap, type) \
  82         (*(type *)(void *)((ap) = (va_list)(((unsigned long)(ap) + 31) & -16),\
  83                            (ap) - 16))
  84 #  define __va_int(ap, type) \
  85         (*(type *)(void *)((ap) += 8, (ap) - sizeof(type)))
  86
  87 #  define __REAL_TYPE_CLASS     8
  88 #  define __RECORD_TYPE_CLASS   12
  89 #  define va_arg(ap, type) \
  90         (__builtin_classify_type(*(type *)0) == __REAL_TYPE_CLASS ?     \
  91          (__alignof__(type) == 16 ? __va_arg16(ap, type) :              \
  92           __va_arg8(ap, type)) :                                        \
  93          (__builtin_classify_type(*(type *)0) < __RECORD_TYPE_CLASS ?   \
  94           __va_int(ap, type) :                                          \
  95           (sizeof(type) <= 8 ? __va_arg8(ap, type) :                    \
  96            (sizeof(type) <= 16 ? __va_arg16(ap, type) :                 \
  97             *__va_arg8(ap, type *)))))
  98 # else /* __arch64__ */
  99 /*
 100  * For sparcv8 code.
 101  */
 102 #  define __va_size(type) \
 103         (((sizeof(type) + sizeof(long) - 1) / sizeof(long)) * sizeof(long))
 104
 105 /*
 106  * va_arg picks up the next argument of type `type'.  Appending an
 107  * asterisk to `type' must produce a pointer to `type' (i.e., `type'
 108  * may not be, e.g., `int (*)()').
 109  *
 110  * Gcc-2.x tries to use ldd/std for double and quad_t values, but Sun's
 111  * brain-damaged calling convention does not quad-align these.  Thus, for
 112  * 8-byte arguments, we have to pick up the actual value four bytes at a
 113  * time, and use type punning (i.e., a union) to produce the result.
 114  * (We could also do this with a libc function, actually, by returning
 115  * 8 byte integers in %o0+%o1 and the same 8 bytes as a double in %f0+%f1.)
 116  *
 117  * Note: We don't declare __d with type `type', since in C++ the type might
 118  * have a constructor.
 119  */
 120
 121 #  define __va_8byte(ap, type) \
 122         __extension__ ({                                                \
 123                 union { char __d[sizeof(type)]; int __i[2]; } __va_u;   \
 124                 __va_u.__i[0] = ((int *)(void *)(ap))[0];               \
 125                 __va_u.__i[1] = ((int *)(void *)(ap))[1];               \
 126                 (ap) += 8; *(type *)(va_list)__va_u.__d;                \
 127         })
 128
 129 #  define __va_arg(ap, type) \
 130         (*(type *)((ap) += __va_size(type),                     \
 131                    (ap) - (sizeof(type) < sizeof(long) &&       \
 132                            sizeof(type) != __va_size(type) ?    \
 133                            sizeof(type) : __va_size(type))))
 134
 135 #  define __RECORD_TYPE_CLASS   12
 136 #  define va_arg(ap, type) \
 137         (__builtin_classify_type(*(type *)0) >= __RECORD_TYPE_CLASS ?   \
 138          *__va_arg(ap, type *) : __va_size(type) == 8 ?                 \
 139          __va_8byte(ap, type) : __va_arg(ap, type))
 140
 141 # endif /* __arch64__ */
 142 #endif /* !__GNUC_PREREQ(3, 0) */
 143
 144 #if !defined(_ANSI_SOURCE) &&                                           \
 145     (defined(_ISOC99_SOURCE) || (__STDC_VERSION__ - 0) >= 199901L ||    \
 146      defined(_NETBSD_SOURCE))
 147 # define va_copy(dst, src)      __va_copy(dst, src)
 148 #endif
 149
 150 #endif /* !_SPARC_STDARG_H_ */