Viewing file:  fault-armo.c (1.9 KB) -rw-r--r--
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/*
* linux/arch/arm/mm/fault-armo.c
*
* Copyright (C) 1995 Linus Torvalds
* Modifications for ARM processor (c) 1995-1999 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#define FAULT_CODE_LDRSTRPOST 0x80
#define FAULT_CODE_LDRSTRPRE 0x40
#define FAULT_CODE_LDRSTRREG 0x20
#define FAULT_CODE_LDMSTM 0x10
#define FAULT_CODE_LDCSTC 0x08
#define FAULT_CODE_PREFETCH 0x04
#define FAULT_CODE_WRITE 0x02
#define FAULT_CODE_FORCECOW 0x01
#define DO_COW(m) ((m) & (FAULT_CODE_WRITE|FAULT_CODE_FORCECOW))
#define READ_FAULT(m) (!((m) & FAULT_CODE_WRITE))
extern int do_page_fault(unsigned long addr, int mode, struct pt_regs *regs);
extern void show_pte(struct mm_struct *mm, unsigned long addr);
/*
* Handle a data abort. Note that we have to handle a range of addresses
* on ARM2/3 for ldm. If both pages are zero-mapped, then we have to force
* a copy-on-write. However, on the second page, we always force COW.
*/
asmlinkage void
do_DataAbort(unsigned long min_addr, unsigned long max_addr, int mode, struct pt_regs *regs)
{
do_page_fault(min_addr, mode, regs);
if ((min_addr ^ max_addr) >> PAGE_SHIFT)
do_page_fault(max_addr, mode | FAULT_CODE_FORCECOW, regs);
}
asmlinkage int
do_PrefetchAbort(unsigned long addr, struct pt_regs *regs)
{
#if 0
if (the memc mapping for this page exists) {
printk ("Page in, but got abort (undefined instruction?)\n");
return 0;
}
#endif
do_page_fault(addr, FAULT_CODE_PREFETCH, regs);
return 1;
}
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