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+/*
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+ * linux/arch/arm/mm/alignment.c
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+ *
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+ * Copyright (C) 1995 Linus Torvalds
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+ * Modifications for ARM processor (c) 1995-2001 Russell King
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+ * Thumb alignment fault fixups (c) 2004 MontaVista Software, Inc.
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+ * - Adapted from gdb/sim/arm/thumbemu.c -- Thumb instruction emulation.
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+ * Copyright (C) 1996, Cygnus Software Technologies Ltd.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+#include <linux/moduleparam.h>
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+#include <linux/compiler.h>
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+#include <linux/kernel.h>
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+#include <linux/errno.h>
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+#include <linux/string.h>
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+#include <linux/proc_fs.h>
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+#include <linux/seq_file.h>
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+#include <linux/init.h>
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+#include <linux/sched.h>
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+#include <linux/uaccess.h>
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+
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+#include <asm/cp15.h>
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+#include <asm/system_info.h>
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+#include <asm/unaligned.h>
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+
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+#include "fault.h"
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+
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+/*
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+ * 32-bit misaligned trap handler (c) 1998 San Mehat (CCC) -July 1998
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+ * /proc/sys/debug/alignment, modified and integrated into
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+ * Linux 2.1 by Russell King
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+ *
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+ * Speed optimisations and better fault handling by Russell King.
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+ *
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+ * *** NOTE ***
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+ * This code is not portable to processors with late data abort handling.
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+ */
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+#define CODING_BITS(i) (i & 0x0e000000)
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+
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+#define LDST_I_BIT(i) (i & (1 << 26)) /* Immediate constant */
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+#define LDST_P_BIT(i) (i & (1 << 24)) /* Preindex */
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+#define LDST_U_BIT(i) (i & (1 << 23)) /* Add offset */
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+#define LDST_W_BIT(i) (i & (1 << 21)) /* Writeback */
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+#define LDST_L_BIT(i) (i & (1 << 20)) /* Load */
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+
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+#define LDST_P_EQ_U(i) ((((i) ^ ((i) >> 1)) & (1 << 23)) == 0)
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+
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+#define LDSTHD_I_BIT(i) (i & (1 << 22)) /* double/half-word immed */
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+#define LDM_S_BIT(i) (i & (1 << 22)) /* write CPSR from SPSR */
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+
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+#define RN_BITS(i) ((i >> 16) & 15) /* Rn */
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+#define RD_BITS(i) ((i >> 12) & 15) /* Rd */
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+#define RM_BITS(i) (i & 15) /* Rm */
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+
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+#define REGMASK_BITS(i) (i & 0xffff)
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+#define OFFSET_BITS(i) (i & 0x0fff)
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+
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+#define IS_SHIFT(i) (i & 0x0ff0)
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+#define SHIFT_BITS(i) ((i >> 7) & 0x1f)
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+#define SHIFT_TYPE(i) (i & 0x60)
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+#define SHIFT_LSL 0x00
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+#define SHIFT_LSR 0x20
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韩正义