/*
 * Copyright 1993,1994,1995 Emin Gun Sirer
 * MIPSI - Mips Instruction Set Simulator.
 */

/* Return the real address associated with the simulated virtual address. */

extern host_addr mem_address(mem_addr addr, c_rw rw) {
    Segment s;
    unsigned long diff;

redo:
    /*
     * we do the range comparison by an unsigned subtraction
     */
    s = segment[(addr >> 28)];
    diff = addr - s.base;
    /* printf("s.segment = %lx + diff = 0x%x ==> 0x%lx\n", s.segment, diff, ((char *)s.segment + diff)); */
    if(diff <= s.size)
	return (host_addr) ((char *)s.segment + diff);
    /*
     * expand stack if necessary -- segment[8] is always a stack segment
     * if the pointer is within a meg of sp, increase sp.
     */
    if((segment[8].base - addr)  < (1 * M)) {
	expand_stack();
	goto redo;
    }
    /* we have to set Cause and BadVAddr */
    BadVAddr = addr;
    /*
     * Let's seg fault right here
     */
    *(char *)0 = '\0';
}