case 1: 
case VM_FAULT_MINOR: 
int do_page_fault(struct pt_regs *regs, unsigned long address,			      unsigned long error_code){	struct mm_struct *mm = current->mm;	struct vm_area_struct * vma;	int write, fault;#ifdef DEBUG	printk ("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld, %p\n",		regs->sr, regs->pc, address, error_code,		current->mm->pgd);#endif	/*	 * If we're in an interrupt or have no user	 * context, we must not take the fault..	 */	if (in_interrupt() || !mm)		goto no_context;	down_read(&mm->mmap_sem);	vma = find_vma(mm, address);	if (!vma)		goto map_err;	if (vma->vm_flags & VM_IO)		goto acc_err;	if (vma->vm_start <= address)		goto good_area;	if (!(vma->vm_flags & VM_GROWSDOWN))		goto map_err;	if (user_mode(regs)) {		/* Accessing the stack below usp is always a bug.  The		   "+ 256" is there due to some instructions doing		   pre-decrement on the stack and that doesn't show up		   until later.  */		if (address + 256 < rdusp())			goto map_err;	}	if (expand_stack(vma, address))		goto map_err;/* * Ok, we have a good vm_area for this memory access, so * we can handle it.. */good_area:#ifdef DEBUG	printk("do_page_fault: good_area\n");#endif	write = 0;	switch (error_code & 3) {		default:	/* 3: write, present */			/* fall through */		case 2:		/* write, not present */			if (!(vma->vm_flags & VM_WRITE))				goto acc_err;			write++;			break;		case 1:		/* read, present */			goto acc_err;		case 0:		/* read, not present */			if (!(vma->vm_flags & (VM_READ | VM_EXEC)))				goto acc_err;	}	/*	 * If for any reason at all we couldn't handle the fault,	 * make sure we exit gracefully rather than endlessly redo	 * the fault.	 */ survive:	fault = handle_mm_fault(mm, vma, address, write);#ifdef DEBUG	printk("handle_mm_fault returns %d\n",fault);#endif	switch (fault) {	case 1:		current->min_flt++;		break;	case 2:		current->maj_flt++;		break;	case 0:		goto bus_err;	default:		goto out_of_memory;	}	up_read(&mm->mmap_sem);	return 0;/* * We ran out of memory, or some other thing happened to us that made * us unable to handle the page fault gracefully. */out_of_memory:	up_read(&mm->mmap_sem);	if (current->pid == 1) {		yield();		down_read(&mm->mmap_sem);		goto survive;	}	printk("VM: killing process %s\n", current->comm);	if (user_mode(regs))		do_exit(SIGKILL);no_context:	current->thread.signo = SIGBUS;	current->thread.faddr = address;	return send_fault_sig(regs);bus_err:	current->thread.signo = SIGBUS;	current->thread.code = BUS_ADRERR;	current->thread.faddr = address;	goto send_sig;map_err:	current->thread.signo = SIGSEGV;	current->thread.code = SEGV_MAPERR;	current->thread.faddr = address;	goto send_sig;acc_err:	current->thread.signo = SIGSEGV;	current->thread.code = SEGV_ACCERR;	current->thread.faddr = address;send_sig:	up_read(&mm->mmap_sem);	return send_fault_sig(regs);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/6e346228c76506e07e297744a28464022c6806ad/fault.c/clean/arch/m68k/mm/fault.c