fault-armo.c
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上传日期:2013-02-24
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文件大小:2k
- /*
- * 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;
- }