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+/*
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+ * This file is subject to the terms and conditions of the GNU General Public
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+ * License. See the file "COPYING" in the main directory of this archive
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+ * for more details.
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+ *
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+ * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
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+ * Copyright (C) 1999 by Silicon Graphics, Inc.
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+ * Copyright (C) 2001 MIPS Technologies, Inc.
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+ * Copyright (C) 2002 Maciej W. Rozycki
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+ *
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+ * Some useful macros for MIPS assembler code
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+ *
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+ * Some of the routines below contain useless nops that will be optimized
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+ * away by gas in -O mode. These nops are however required to fill delay
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+ * slots in noreorder mode.
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+ */
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+#ifndef __ASM_ASM_H
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+#define __ASM_ASM_H
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+
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+#include <asm/sgidefs.h>
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+
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+#ifndef CAT
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+#ifdef __STDC__
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+#define __CAT(str1, str2) str1##str2
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+#else
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+#define __CAT(str1, str2) str1/**/str2
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+#endif
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+#define CAT(str1, str2) __CAT(str1, str2)
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+#endif
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+
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+/*
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+ * PIC specific declarations
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+ * Not used for the kernel but here seems to be the right place.
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+ */
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+#ifdef __PIC__
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+#define CPRESTORE(register) \
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+ .cprestore register
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+#define CPADD(register) \
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+ .cpadd register
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+#define CPLOAD(register) \
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+ .cpload register
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+#else
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+#define CPRESTORE(register)
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+#define CPADD(register)
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+#define CPLOAD(register)
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+#endif
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+
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+/*
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+ * LEAF - declare leaf routine
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+ */
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+#define LEAF(symbol) \
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+ .globl symbol; \
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+ .align 2; \
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+ .type symbol, @function; \
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+ .ent symbol, 0; \
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+symbol: .frame sp, 0, ra
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+
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+/*
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+ * NESTED - declare nested routine entry point
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+ */
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+#define NESTED(symbol, framesize, rpc) \
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+ .globl symbol; \
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+ .align 2; \
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+ .type symbol, @function; \
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+ .ent symbol, 0; \
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+symbol: .frame sp, framesize, rpc
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+
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+/*
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+ * END - mark end of function
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+ */
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+#define END(function) \
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+ .end function; \
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+ .size function, .-function
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+
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+/*
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+ * EXPORT - export definition of symbol
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+ */
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+#define EXPORT(symbol) \
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+ .globl symbol; \
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+symbol:
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+
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+/*
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+ * FEXPORT - export definition of a function symbol
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+ */
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+#define FEXPORT(symbol) \
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+ .globl symbol; \
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+ .type symbol, @function; \
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+symbol:
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+
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+/*
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+ * ABS - export absolute symbol
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+ */
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+#define ABS(symbol,value) \
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+ .globl symbol; \
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+symbol = value
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+
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+#define PANIC(msg) \
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+ .set push; \
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+ .set reorder; \
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+ PTR_LA a0, 8f; \
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+ jal panic; \
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+9: b 9b; \
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+ .set pop; \
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+ TEXT(msg)
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+
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+/*
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+ * Print formatted string
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+ */
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+#ifdef CONFIG_PRINTK
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+#define PRINT(string) \
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+ .set push; \
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+ .set reorder; \
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+ PTR_LA a0, 8f; \
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+ jal printk; \
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+ .set pop; \
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+ TEXT(string)
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+#else
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+#define PRINT(string)
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+#endif
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+
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+#define TEXT(msg) \
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+ .pushsection .data; \
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+8: .asciiz msg; \
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+ .popsection;
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+
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+/*
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+ * Build text tables
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+ */
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+#define TTABLE(string) \
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+ .pushsection .text; \
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+ .word 1f; \
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+ .popsection \
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+ .pushsection .data; \
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+1: .asciiz string; \
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+ .popsection
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+
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+/*
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+ * MIPS IV pref instruction.
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+ * Use with .set noreorder only!
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+ *
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+ * MIPS IV implementations are free to treat this as a nop. The R5000
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+ * is one of them. So we should have an option not to use this instruction.
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+ */
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+#ifdef CONFIG_CPU_HAS_PREFETCH
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+
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+#define PREF(hint,addr) \
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+ .set push; \
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+ .set mips4; \
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朱涛