stk/Stack/libstack-MIPS32.c

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/******************************************************************************
*
* l i b s t a c k - M I P S . c
*
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* Copyright <EFBFBD> 1997-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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*
*
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* Permission to use, copy, modify, distribute,and license this
* software and its documentation for any purpose is hereby granted,
* provided that existing copyright notices are retained in all
* copies and that this notice is included verbatim in any
* distributions. No written agreement, license, or royalty fee is
* required for any of the authorized uses.
* This software is provided ``AS IS'' without express or implied
* warranty.
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*
*
* Author: Erick Gallesio [eg@unice.fr]
* Creation date: 29-Sep-1997 14:56
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* Last file update: 3-Sep-1999 21:06 (eg)
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*
******************************************************************************/
#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;
}
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/* Since we do not know how many floats are passed (and where), we set all
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* 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;
}