libc/arch/mips32/include/stackarg.h

   1 /*
   2  * Copyright (C) 2006 Josef Cejka
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29  /** @addtogroup libcmips32
  30  * @{
  31  */
  32 /** @file
  33  * @ingroup libcmips32eb
  34  */
  35
  36 #ifndef __LIBC_mips32_STACKARG_H__
  37 #define __LIBC_mips32_STACKARG_H__
  38
  39 /* dont allow to define it second time in stdarg.h */
  40 #define __VARARGS_DEFINED
  41
  42 #include <types.h>
  43
  44 /**
  45  * va_arg macro for MIPS32 - problem is that 64 bit values must be aligned on an 8-byte boundary (32bit values not)
  46  * To satisfy this, paddings must be sometimes inserted.
  47  */
  48
  49 typedef uint8_t* va_list;
  50
  51 #define va_start(ap, lst) \
  52         ((ap) = (va_list)&(lst) + sizeof(lst))
  53
  54 #define va_arg(ap, type)        \
  55         (((type *)((ap) = (va_list)( (sizeof(type) <= 4) ? ((uint32_t)((ap) + 2*4 - 1) & (~3)) : ((uint32_t)((ap) + 2*8 -1) & (~7)) )))[-1])
  56
  57 #define va_end(ap)
  58
  59 #endif
  60
  61  /** @}
  62  */
  63