cpu.c
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//
// Created by imanol on 12/25/16.
//
#include <stdlib.h>
#include "cpu.h"
uint64_t cycle_count = 0;
void mov(uint16_t dst, uint16_t src)
{
if(src > MAX_INT)
{
regs[dst % (MAX_INT+1)] = regs[src % (MAX_INT+1)];
}
else
{
regs[dst % (MAX_INT+1)] = src;
}
}
void push(uint16_t src)
{
if(src > MAX_INT)
{
stack_push(regs[src % (MAX_INT+1)]);
}
else
{
stack_push(src);
}
}
void pop(uint16_t dst)
{
uint16_t value = stack_pop();
if(STACK_FAULT)
{
fprintf(stderr,"CRITICAL: STACK VIOLATION\n");
core_dump();
}
regs[dst % (MAX_INT+1)] = value;
}
void teq(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a == b);
}
void tgt(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a > b);
}
void jmp(uint16_t dst)
{
if(dst > MAX_INT)
{
pc = regs[dst % (MAX_INT+1)];
}
else
{
pc = dst;
}
}
void jnz(uint16_t cond, uint16_t dst)
{
if(cond > MAX_INT)
{
cond = regs[cond % (MAX_INT+1)];
}
if(cond)
{
jmp(dst);
}
}
void jz(uint16_t cond, uint16_t dst)
{
if(cond > MAX_INT)
{
cond = regs[cond % (MAX_INT+1)];
}
if(!cond)
{
jmp(dst);
}
}
void add(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a + b) % (MAX_INT+1);
}
void mult(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a * b) % (MAX_INT+1);
}
void mod(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a % b);
}
void and(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a & b);
}
void or(uint16_t dst, uint16_t a, uint16_t b)
{
if(a > MAX_INT)
{
a = regs[a % (MAX_INT+1)];
}
if(b > MAX_INT)
{
b = regs[b % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = (a | b);
}
void not(uint16_t dst, uint16_t src)
{
if(src > MAX_INT)
{
src = regs[src % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = ~src & 0x7FFF;
}
void load(uint16_t dst, uint16_t src)
{
if(src > MAX_INT)
{
src = regs[src % (MAX_INT+1)];
}
regs[dst % (MAX_INT+1)] = mem[src];
}
void stor(uint16_t dst, uint16_t src)
{
if(src > MAX_INT)
{
src = regs[src % (MAX_INT+1)];
}
if(dst > MAX_INT)
{
mem[regs[dst % (MAX_INT+1)]] = src;
}
else
{
mem[dst] = src;
}
}
void call(uint16_t dst)
{
stack_push(pc);
jmp(dst);
}
uint8_t ret()
{
pc = stack_pop();
return STACK_FAULT;
}
void out(uint16_t src)
{
if(src > MAX_INT)
{
src = regs[src % (MAX_INT+1)];
}
putchar(src);
}
void in(uint16_t dst)
{
int c = getchar();
regs[dst % (MAX_INT + 1)] = (uint16_t)c;
}
void nop()
{
return;
}
uint16_t fetch()
{
/*if(pc == 0x5bf-1)
{
//break
}*/
uint16_t value = mem[pc++];
//printf("0x%2x (0x%2x)",pc,pc*sizeof(uint16_t));
//printf(" cycle: %d\n",cycle_count++);
return value;
}
void start_execution()
{
uint16_t arg1;
uint16_t arg2;
uint16_t arg3;
for(;;)
{
uint16_t opcode = fetch();
switch(opcode)
{
case HALT:
return;
case MOV:
arg1 = fetch();
arg2 = fetch();
mov(arg1,arg2);
break;
case PUSH:
arg1 = fetch();
push(arg1);
break;
case POP:
arg1 = fetch();
pop(arg1);
break;
case TEQ:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
teq(arg1,arg2,arg3);
break;
case TGT:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
tgt(arg1,arg2,arg3);
break;
case JMP:
arg1 = fetch();
jmp(arg1);
break;
case JNZ:
arg1 = fetch();
arg2 = fetch();
jnz(arg1,arg2);
break;
case JZ:
arg1 = fetch();
arg2 = fetch();
jz(arg1,arg2);
break;
case ADD:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
add(arg1,arg2,arg3);
break;
case MULT:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
mult(arg1,arg2,arg3);
break;
case MOD:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
mod(arg1,arg2,arg3);
break;
case AND:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
and(arg1,arg2,arg3);
break;
case OR:
arg1 = fetch();
arg2 = fetch();
arg3 = fetch();
or(arg1,arg2,arg3);
break;
case NOT:
arg1 = fetch();
arg2 = fetch();
not(arg1,arg2);
break;
case LOAD:
arg1 = fetch();
arg2 = fetch();
load(arg1,arg2);
break;
case STOR:
arg1 = fetch();
arg2 = fetch();
stor(arg1,arg2);
break;
case CALL:
arg1 = fetch();
call(arg1);
break;
case RET:
if(ret())
{
return;
}
break;
case OUT:
arg1 = fetch();
out(arg1);
break;
case IN:
arg1 = fetch();
in(arg1);
break;
case NOP:
nop();
break;
default:
fprintf(stderr,"CRITICAL: UNKNOWN OPCODE %2x FOUND IN %2x\n",opcode,pc);
core_dump();
break;
}
}
}
void core_dump()
{
fprintf(stderr,"r0: %2x\n",regs[0]);
fprintf(stderr,"r1: %2x\n",regs[1]);
fprintf(stderr,"r2: %2x\n",regs[2]);
fprintf(stderr,"r3: %2x\n",regs[3]);
fprintf(stderr,"r4: %2x\n",regs[4]);
fprintf(stderr,"r5: %2x\n",regs[5]);
fprintf(stderr,"r6: %2x\n",regs[6]);
fprintf(stderr,"r7: %2x\n",regs[7]);
fprintf(stderr,"pc: %2x\n",pc);
//dump memory to file
//dump stack to file
exit(1);
}