98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
/******************************************************************************
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*
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* l i b s t a c k - M I P S . c
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*
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* Copyright © 1997-1999 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
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*
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*
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* Permission to use, copy, modify, distribute,and license this
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* software and its documentation for any purpose is hereby granted,
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* provided that existing copyright notices are retained in all
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* copies and that this notice is included verbatim in any
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* distributions. No written agreement, license, or royalty fee is
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* required for any of the authorized uses.
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* This software is provided ``AS IS'' without express or implied
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* warranty.
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*
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*
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* Author: Erick Gallesio [eg@unice.fr]
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* Creation date: 29-Sep-1997 14:56
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* Last file update: 3-Sep-1999 21:06 (eg)
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*
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******************************************************************************/
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#include "libstack.h"
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/*
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Doubles are 2 words aligned on even boundaries.
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If the first two args are floats or doubles, they are also passed in $f12
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and $f14. But varargs functions will expect them in the integer registers
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and we can't tell whether the function is varargs so we pass them both ways.
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*/
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fake_type stk_argv[MAX_EXTERNAL_PARAM];
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int stk_argc = 0;
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double stk_double_register1, stk_double_register2;
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int stk_push_float(float f)
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{
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switch (stk_argc) {
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case 0: stk_double_register1 = (double) f;
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stk_argv[stk_argc++].f[1]=f;
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return 0;
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case 1: stk_double_register2 = (double) f;
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stk_argv[stk_argc++].f[1]=f;
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return 0;
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default: if (stk_argc < MAX_EXTERNAL_PARAM) {
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/* Value will be stacked as a float */
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stk_argv[stk_argc++].f[0]=f;
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return 0;
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}
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}
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return -1;
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}
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int stk_push_double(double d)
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{
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if (stk_argc < 4) {
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stk_double_register1 = stk_argv[stk_argc].d= d;
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stk_argv[stk_argc+1].f[1]= stk_argv[stk_argc].f[0];
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stk_argc += 2;
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return 0;
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}
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else if (stk_argc < MAX_EXTERNAL_PARAM) {
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/* Value will be stacked as a float */
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stk_argv[stk_argc].d= d;
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stk_argv[stk_argc+1].f[1]= stk_argv[stk_argc].f[0];
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stk_argc += 2;
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return 0;
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}
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return -1;
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}
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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
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*/
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#define mips_big_switch {stk_copy_float_registers(); big_switch;}
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long stk_call_long(void *func)
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{
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long (*f)() = func;
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mips_big_switch;
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}
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double stk_call_double(void *func)
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{
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double (*f)() = func;
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mips_big_switch;
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}
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float stk_call_float(void *func)
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{
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float (*f)() = func;
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mips_big_switch;
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}
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