#include <unistd.h>
#include <stdlib.h>

#include "cpu.h"
#include "mem.h"
#include "syscall.h"

void do_syscall(void)
{
	switch (GPR[1]) {
	case SYS_exit:
		exit(GPR[2]);
		break;
	case SYS_read:
		GPR[2] = read(GPR[2], &MEM[GPR[3]], GPR[4]);
		break;
	case SYS_write:
		GPR[2] = write(GPR[2], &MEM[GPR[3]], GPR[4]);
		break;
	default:
		GPR[2] = -1;
	}
}