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CPU: Moved the PC and SP registers into the registers_t struct

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(Tim) Efthimis Kritikos 2024-02-12 14:16:41 +00:00
parent 2579d6974c
commit deed349cd1
5 changed files with 41 additions and 25 deletions
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24
cpu.c
View File

@ -11,10 +11,10 @@ void free_fetch_data(__attribute__((unused)) struct fetch_data_t *tofree){
}
int fetch(struct simdata_t *simdata){
free_instr_list(&simdata->cpu_gui_hints->fetching_list);
simdata->decode_data->in_bytecode=(uint32_t)(simdata->RAM[simdata->PC])<<24|(uint32_t)(simdata->RAM[simdata->PC+1])<<16|(uint32_t)(simdata->RAM[simdata->PC+2])<<8|(uint32_t)(simdata->RAM[simdata->PC+3]);
simdata->decode_data->address=simdata->PC;
add_to_instr_list(&simdata->cpu_gui_hints->fetching_list,simdata->PC);
simdata->PC+=4;
simdata->decode_data->in_bytecode=(uint32_t)(simdata->RAM[simdata->registers->PC])<<24|(uint32_t)(simdata->RAM[simdata->registers->PC+1])<<16|(uint32_t)(simdata->RAM[simdata->registers->PC+2])<<8|(uint32_t)(simdata->RAM[simdata->registers->PC+3]);
simdata->decode_data->address=simdata->registers->PC;
add_to_instr_list(&simdata->cpu_gui_hints->fetching_list,simdata->registers->PC);
simdata->registers->PC+=4;
return 0;
}
@ -200,18 +200,18 @@ int exec(struct simdata_t *simdata){
}
if(condition){
if(simdata->exec_data->EXEC_ACTION==CALL){
simdata->RAM[simdata->SP]=simdata->PC;
simdata->SP+=6;
simdata->RAM[simdata->registers->SP]=simdata->registers->PC;
simdata->registers->SP+=6;
}
if(simdata->exec_data->out_op->OP_ADDR==IMMEDIATE)
simdata->PC=simdata->exec_data->out_op->data;
simdata->registers->PC=simdata->exec_data->out_op->data;
else
return 1;
}
break;
case RET:
simdata->SP-=6;
simdata->PC=simdata->RAM[simdata->SP];
simdata->registers->SP-=6;
simdata->registers->PC=simdata->RAM[simdata->registers->SP];
break;
case EXEC_ALU:
if( simdata->exec_data->in_op1->OP_ADDR==REGISTER &&
@ -273,12 +273,12 @@ int exec(struct simdata_t *simdata){
case REGISTER: /* This is for special registers like the SP which is 24bits long */
if(simdata->exec_data->in_op1->OP_ADDR==IMMEDIATE){
if( (simdata->exec_data->in_op1->data&0xFF000000) == 0 )
simdata->SP=simdata->exec_data->in_op1->data;
simdata->registers->SP=simdata->exec_data->in_op1->data;
else
return 2;
}else{
if( (simdata->registers->GPR[simdata->exec_data->in_op1->data]&0xFF000000) == 0 )
simdata->SP=simdata->registers->GPR[simdata->exec_data->in_op1->data];
simdata->registers->SP=simdata->registers->GPR[simdata->exec_data->in_op1->data];
else
return 2;
}
@ -349,6 +349,8 @@ int cpu_simdata_malloc(struct simdata_t *simdata){
simdata->decode_data=malloc_decode_data();
simdata->exec_data=malloc_exec_data();
simdata->registers=malloc(sizeof(struct registers_t));
simdata->registers->PC=0x00000000;
simdata->registers->SP&=0x00FFFFFF; //intentionally leave it uninitialised but within the legal range
if((simdata->fetch_data!=NULL)&&(simdata->decode_data!=NULL)&&(simdata->exec_data!=NULL))
return 1;
else

2
cpu.h
View File

@ -79,6 +79,8 @@ int cpu_cycle_clock(struct simdata_t *simdata);
struct registers_t{
uint32_t GPR[8];
uint32_t FLAGS;
uint32_t PC;
uint32_t SP;
};
#endif

36
gui.c
View File

@ -243,6 +243,11 @@ int update_general_disas(struct simdata_t *simdata){
int width,height;
getmaxyx(general_disas,height,width);
box(general_disas, 0 , 0);
mvwprintw(general_disas,0,width/2-7,"[ DISASSEMBLY ]");
if(simdata->registers==NULL||simdata->RAM==NULL){
mvwprintw(general_disas,1,1,"Data not initialised");
return 0;
}
int offset_arrow;
int have_legend=(width>29);
@ -253,17 +258,16 @@ int update_general_disas(struct simdata_t *simdata){
offset_arrow=2;
else
offset_arrow=3;
mvwprintw(general_disas,0,width/2-7,"[ DISASSEMBLY ]");
if(width<18){
mvwprintw(general_disas,1,1,"too small window");
}else{
uint32_t ADDRESS=(simdata->PC-(usable_height/2-2)*4)&0x00FFFFFF;
uint32_t ADDRESS=(simdata->registers->PC-(usable_height/2-2)*4)&0x00FFFFFF;
for (int i=2;i<usable_height;i++){
int overall_offset=offset_arrow-2;
mvwaddch(general_disas,i,11+overall_offset,ACS_VLINE);
if(ADDRESS==simdata->PC)
if(ADDRESS==simdata->registers->PC)
wattron(general_disas,A_BOLD);
mvwprintw(general_disas,i,4+overall_offset,"%06X",ADDRESS);
char* disas=disassemble(*(uint32_t*)(simdata->RAM+ADDRESS));
@ -275,7 +279,7 @@ int update_general_disas(struct simdata_t *simdata){
mvwprintw(general_disas,i,13+overall_offset,"%s",disas);
select_instruction_color(simdata,general_disas,ADDRESS,0);
if(ADDRESS==simdata->PC)
if(ADDRESS==simdata->registers->PC)
wattroff(general_disas,A_BOLD);
ADDRESS=(ADDRESS+4)&0xFFFFFF;
@ -319,6 +323,10 @@ int update_general_stack(struct simdata_t *simdata){
getmaxyx(general_stack,height,width);
box(general_stack, 0 , 0);
mvwprintw(general_stack,0,width/2-4,"[ STACK ]");
if(simdata->registers==NULL||simdata->RAM==NULL){
mvwprintw(general_stack,1,1,"Data not initialised");
return 0;
}
if(width<13){
mvwprintw(general_stack,1,1,"too small window");
}else{
@ -333,13 +341,13 @@ int update_general_stack(struct simdata_t *simdata){
}
// draw data
uint32_t ADDRESS=(simdata->SP-(height/2-2)*4)&0x00FFFFFF;
uint32_t ADDRESS=(simdata->registers->SP-(height/2-2)*4)&0x00FFFFFF;
for(int i=0;i<height-4;i++){
if(ADDRESS==simdata->SP)
if(ADDRESS==simdata->registers->SP)
wattron(general_stack,A_BOLD);
mvwprintw(general_stack,i+2,offset_data,"%08X",*(uint32_t*)(simdata->RAM+ADDRESS));
if(ADDRESS==simdata->SP)
if(ADDRESS==simdata->registers->SP)
wattroff(general_stack,A_BOLD);
ADDRESS=(ADDRESS+4)&0xFFFFFF;
}
@ -375,13 +383,17 @@ int update_general_memdump(struct simdata_t *simdata){
getmaxyx(general_memdump,height,width);
box(general_memdump, 0 , 0);
mvwprintw(general_memdump,0,terminal_width/4-6,"[ MEMDUMP ]");
if(simdata->registers==NULL||simdata->RAM==NULL){
mvwprintw(general_memdump,1,1,"Data not initialised");
return 0;
}
if(width<16){
mvwprintw(general_memdump,1,1,"too small window");
}else{
int n=(width-12)/4; // bytes in each line
int usable_height=height-3-(width-12)%2;
uint32_t ADDRESS=(simdata->PC-n*usable_height/2)&0x00FFFFFF;
uint32_t ADDRESS=(simdata->registers->PC-n*usable_height/2)&0x00FFFFFF;
uint32_t color_addr;
int have_color;
@ -391,7 +403,7 @@ int update_general_memdump(struct simdata_t *simdata){
wprintw(general_memdump,"%06x ",ADDRESS);
uint32_t temp_address=ADDRESS;
for (int i=0;i<n;i++){
if(ADDRESS>=simdata->PC&&ADDRESS<=simdata->PC+3)
if(ADDRESS>=simdata->registers->PC&&ADDRESS<=simdata->registers->PC+3)
wattron(general_memdump,A_BOLD);
else
wattroff(general_memdump,A_BOLD);
@ -412,7 +424,7 @@ int update_general_memdump(struct simdata_t *simdata){
select_instruction_color(simdata,general_memdump,color_addr,0);
ADDRESS=temp_address;
for (int i=0;i<n;i++){
if(ADDRESS>=simdata->PC&&ADDRESS<=simdata->PC+3)
if(ADDRESS>=simdata->registers->PC&&ADDRESS<=simdata->registers->PC+3)
wattron(general_memdump,A_BOLD);
else
wattroff(general_memdump,A_BOLD);
@ -430,6 +442,10 @@ int update_general_registers(struct simdata_t *simdata){
getmaxyx(general_registers,height,width);
box(general_registers, 0 , 0);
mvwprintw(general_registers,0,terminal_width/4-7,"[ REGISTERS ]");
if(simdata->registers==NULL){
mvwprintw(general_registers,1,1,"Data not initialised");
return 0;
}
if(simdata->registers==NULL)
mvwprintw(general_registers,1,1,"Registers data structure not initialised");
else{

2
simdata.c
View File

@ -36,8 +36,6 @@ struct simdata_t *init_simdata(){
return 0;
}
ret->PC=0;
ret->SP=0;
ret->registers=NULL;
ret->cpu_state=CPU_RUNNING;
ret->cpu_gui_hints=malloc(sizeof(struct cpu_gui_hints_t));

2
simdata.h
View File

@ -9,8 +9,6 @@ enum CPU_STATE_t{
struct simdata_t{
long unsigned int current_clock;
uint8_t *RAM;
uint32_t PC;
uint32_t SP;
struct fetch_data_t *fetch_data;
struct decode_data_t *decode_data;
struct exec_data_t *exec_data;