stk/Stack/libstack-MIPS32.c

100 lines
2.7 KiB
C

/******************************************************************************
*
* l i b s t a c k - M I P S . 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: 29-Sep-1997 14:56
* Last file update: 30-Sep-1997 13:17
*
******************************************************************************/
#include "libstack.h"
/*
Doubles are 2 words aligned on even boundaries.
If the first two args are floats or doubles, they are also passed in $f12
and $f14. But varargs functions will expect them in the integer registers
and we can't tell whether the function is varargs so we pass them both ways.
*/
fake_type stk_argv[MAX_EXTERNAL_PARAM];
int stk_argc = 0;
double stk_double_register1, stk_double_register2;
int stk_push_float(float f)
{
switch (stk_argc) {
case 0: stk_double_register1 = (double) f;
stk_argv[stk_argc++].f[1]=f;
return 0;
case 1: stk_double_register2 = (double) f;
stk_argv[stk_argc++].f[1]=f;
return 0;
default: if (stk_argc < MAX_EXTERNAL_PARAM) {
/* Value will be stacked as a float */
stk_argv[stk_argc++].f[0]=f;
return 0;
}
}
return -1;
}
int stk_push_double(double d)
{
if (stk_argc < 4) {
stk_double_register1 = stk_argv[stk_argc].d= d;
stk_argv[stk_argc+1].f[1]= stk_argv[stk_argc].f[0];
stk_argc += 2;
return 0;
}
else if (stk_argc < MAX_EXTERNAL_PARAM) {
/* Value will be stacked as a float */
stk_argv[stk_argc].d= d;
stk_argv[stk_argc+1].f[1]= stk_argv[stk_argc].f[0];
stk_argc += 2;
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 mips_big_switch {stk_copy_float_registers(); big_switch;}
long stk_call_long(void *func)
{
long (*f)() = func;
mips_big_switch;
}
double stk_call_double(void *func)
{
double (*f)() = func;
mips_big_switch;
}
float stk_call_float(void *func)
{
float (*f)() = func;
mips_big_switch;
}