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

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

#define arg(n) load(GPR[SP] + 4*n)

void do_syscall(void)
{
	switch (arg(0)) {
	case SYS_exit:
		exit(arg(1));
		break;
	case SYS_read:
		push(read(arg(1), &MEM[arg(2)], arg(3)));
		break;
	case SYS_write:
		push(write(arg(1), &MEM[arg(2)], arg(3)));
		break;
	default:
		push(-1);
	}
}