113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/* simdata.c
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This file is part of the "First" CPU simulator project.
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Copyright (c) 2024 Efthymios Kritikos
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include "simdata.h"
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#include <stdio.h>
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#include "gui.h" // for cleaning the cpu output
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struct simdata_t *init_simdata(){
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struct simdata_t * ret=malloc(sizeof(struct simdata_t));
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if(!ret){
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ret->current_clock=0;
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return 0;
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}
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ret->RAM=malloc(16777216); //Maximum addressable memory
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if(!ret->RAM){
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printf("failed to allocate 16MiB of memory for the system ram");
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free(ret);
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return 0;
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}
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ret->registers=NULL;
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ret->cpu_state=CPU_RUNNING;
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ret->cpu_gui_hints=malloc(sizeof(struct cpu_gui_hints_t));
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ret->cpu_gui_hints->decoding_list=NULL;
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ret->cpu_gui_hints->fetching_list=NULL;
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ret->cpu_gui_hints->executing_list=NULL;
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ret->terminal_output=malloc(0);
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ret->terminal_output_size=0;
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return ret;
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}
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uint8_t output_counter=0;
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int terminal_output(uint32_t c,struct simdata_t *simdata){
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simdata->terminal_output=realloc(simdata->terminal_output,simdata->terminal_output_size+4);
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if(!simdata->terminal_output)
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return 1;
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simdata->terminal_output[simdata->terminal_output_size/4]=c;
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simdata->terminal_output_size=simdata->terminal_output_size+4;
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output_counter++;
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if((output_counter%100)==0)
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clean_cpu_output(simdata);
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return 0;
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}
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void free_instr_list(struct instr_list_t **addr_of_tofree){
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struct instr_list_t *tofree=*addr_of_tofree;
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while(tofree){
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struct instr_list_t *temp=tofree;
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tofree=tofree->next;
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free(temp);
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}
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*addr_of_tofree=0;
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}
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int add_to_instr_list(struct instr_list_t **toadd,uint32_t address){
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while(*toadd){
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toadd=&((*toadd)->next);
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}
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*toadd=malloc(sizeof(struct instr_list_t));
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(*toadd)->address=address;
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(*toadd)->next=NULL;
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return 0;
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}
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void free_simdata(struct simdata_t *p){
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free(p->RAM);
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free_instr_list(&p->cpu_gui_hints->decoding_list);
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free_instr_list(&p->cpu_gui_hints->fetching_list);
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free_instr_list(&p->cpu_gui_hints->executing_list);
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free(p->cpu_gui_hints);
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free(p->terminal_output);
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free(p);
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}
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#if defined ( __STDC_IEC_559__ )
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union U32FLOAT_RETURN{
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float f;
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uint32_t u;
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};
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float uint32_to_ieee754_float(uint32_t in){
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union U32FLOAT_RETURN ret;
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ret.u=in;
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return ret.f;
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}
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uint32_t ieee754_float_to_uint32(float in){
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union U32FLOAT_RETURN ret;
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ret.f=in;
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return ret.u;
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}
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#else
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#error Your libc/compiler/architecture doesnt support IEEE 457/IEC 559 Please write a software alternative here
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#endif
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