/******************************************************************************
 *
 * l i b s t a c k - A L P H A . c
 *
 * Copyright © 1997 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
 * 
 *
 * Permission to use, copy, and/or distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that both the above copyright notice and this permission notice appear in
 * all copies and derived works.  Fees for distribution or use of this
 * software or derived works may only be charged with express written
 * permission of the copyright holder.  
 * This software is provided ``as is'' without express or implied warranty.
 *
 * This software is a derivative work of other copyrighted softwares; the
 * copyright notices of these softwares are placed in the file COPYRIGHTS
 *
 *
 *           Author: Erick Gallesio [eg@unice.fr]
 *    Creation date: 28-Sep-1997 17:30
 * Last file update: 29-Sep-1997 12:35
 *
 ******************************************************************************/

/*
  The first 6 arguments are passed in registers $16-$21 for integers,
  in registers $f16-$f21 for floats. From then on, everything is passed
  on the stack.

  Everything on the stack is word-aligned.
*/

#include "libstack.h"

fake_type stk_argv[MAX_EXTERNAL_PARAM];
int stk_argc = 0;

extern void stk_copy_float_registers(void);


int stk_push_float(float f)
{
  if (stk_argc < 6) {
    /* Value must goes in a register, store it as a double */
    stk_argv[stk_argc++].d=(double)f;
    return 0;
  }
  if (stk_argc < MAX_EXTERNAL_PARAM) {
    /* Value will be stacked as a float */
    stk_argv[stk_argc++].f[0]=f;
    return 0;
  }
  return -1;
}


/* Since we do not know how much floats are passed (and where), we set all
 * float  registers before calling the function 
 */

#define alpha_big_switch {stk_copy_float_registers(); big_switch;}
  
long stk_call_long(void *func)
{
  long (*f)() = func;
  alpha_big_switch;
}

double stk_call_double(void *func)
{
  double (*f)() = func;
  alpha_big_switch;
}


float stk_call_float(void *func)
{
  float (*f)() = func;
  alpha_big_switch;
}