stdarg.h

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#ifndef __STDARG_H__
#define __STDARG_H__
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* va list parameter list */
typedef unsigned char* va_list;
 
/* width of stack == width of int */
#define STACKITEM int64_t
 
/* round up width of objects pushed on stack. The expression before the
    & ensures that we get 0 for objects of size 0. */
#define VA_SIZE(TYPE) ((sizeof(TYPE) + sizeof(STACKITEM) - 1) & ~(sizeof(STACKITEM) - 1))
 
#ifdef ARCH_X64
/* &(LASTARG) points to the LEFTMOST argument of the function call
    (before the ...) */
#define va_start(AP, LASTARG) (AP = ((va_list) & (LASTARG) + VA_SIZE(LASTARG)))
 
/* nothing for va_end */
#define va_end(AP)
 
#define va_arg(AP, TYPE) (AP += VA_SIZE(TYPE), *((TYPE*)(AP - VA_SIZE(TYPE))))
#elif ARCH_ARM64
#define va_start(ap, last) ((ap) = (va_list)(&(last)) + 8)
 
#define va_arg(ap, T) (*(T*)((ap) += 8, (ap) - 8))
 
#define va_end(ap) ((ap) = (va_list)0)
#endif
 
#ifdef __cplusplus
}
#endif
 
#endif