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#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);
}
}
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