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Project/Src/rt-thread/libcpu/mips/common/asm.h

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+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
+ * Copyright (C) 1999 by Silicon Graphics, Inc.
+ * Copyright (C) 2001 MIPS Technologies, Inc.
+ * Copyright (C) 2002  Maciej W. Rozycki
+ *
+ * Some useful macros for MIPS assembler code
+ *
+ * Some of the routines below contain useless nops that will be optimized
+ * away by gas in -O mode. These nops are however required to fill delay
+ * slots in noreorder mode.
+ */
+#ifndef __ASM_H__
+#define __ASM_H__
+
+/*
+ * LEAF - declare leaf routine
+ */
+#define	LEAF(symbol)                        \
+		.globl	symbol;                     \
+		.align	2;                          \
+		.type	symbol,@function;           \
+		.ent	symbol,0;                   \
+symbol:		.frame	sp,0,ra
+
+/*
+ * NESTED - declare nested routine entry point
+ */
+#define	NESTED(symbol, framesize, rpc)      \
+		.globl	symbol;                     \
+		.align	2;                          \
+		.type	symbol,@function;           \
+		.ent	symbol,0;                   \
+symbol:		.frame	sp, framesize, rpc
+
+/*
+ * END - mark end of function
+ */
+#define	END(function)                       \
+		.end	function;		        	\
+		.size	function,.-function
+
+/*
+ * EXPORT - export definition of symbol
+ */
+#define EXPORT(symbol)						\
+		.globl	symbol;                     \
+symbol:
+
+/*
+ * FEXPORT - export definition of a function symbol
+ */
+#define FEXPORT(symbol)						\
+		.globl	symbol;						\
+		.type	symbol,@function;			\
+symbol:
+
+/*
+ * Global data declaration with size.
+ */
+#define EXPORTS(name,sz) 		\
+  	.globl name; 				\
+  	.type name,@object; 		\
+  	.size name,sz; 				\
+name:
+
+/*
+ * Weak data declaration with size.
+ */
+#define WEXPORT(name,sz) 		\
+  	.weakext name; 				\
+  	.type name,@object; 		\
+  	.size name,sz; 				\
+name:
+
+/*
+ * Global data reference with size.
+ */
+#define	IMPORT(name, size) 		\
+	.extern	name,size
+
+/*
+ * Global zeroed data.
+ */
+#define BSS(name,size) 			\
+  	.type name,@object; 		\
+	.comm	name,size
+
+/*
+ * Local zeroed data.
+ */
+#define LBSS(name,size) 		\
+  	.lcomm	name,size
+
+
+/*
+ * ABS - export absolute symbol
+ */
+#define	ABS(symbol,value)       \
+		.globl	symbol;         \
+symbol		=	value
+
+
+#define	TEXT(msg)               \
+		.pushsection .data;		\
+8:		.asciiz	msg;            \
+		.popsection;
+
+
+#define ENTRY(name) 			\
+  .globl name;					\
+  .align 2;						\
+  .ent name,0;					\
+  name##:
+
+/*
+ * Macros to handle different pointer/register sizes for 32/64-bit code
+ */
+
+/*
+ * Size of a register
+ */
+#define SZREG	4
+
+
+/*
+ * Use the following macros in assemblercode to load/store registers,
+ * pointers etc.
+ */
+#define REG_S		sw
+#define REG_L		lw
+#define REG_SUBU	subu
+#define REG_ADDU	addu
+
+
+/*
+ * How to add/sub/load/store/shift C int variables.
+ */
+#define INT_ADD		add
+#define INT_ADDU	addu
+#define INT_ADDI	addi
+#define INT_ADDIU	addiu
+#define INT_SUB		sub
+#define INT_SUBU	subu
+#define INT_L		lw
+#define INT_S		sw
+#define INT_SLL		sll
+#define INT_SLLV	sllv
+#define INT_SRL		srl
+#define INT_SRLV	srlv
+#define INT_SRA		sra
+#define INT_SRAV	srav
+
+
+
+/*
+ * How to add/sub/load/store/shift C long variables.
+ */
+#define LONG_ADD	add
+#define LONG_ADDU	addu
+#define LONG_ADDI	addi
+#define LONG_ADDIU	addiu
+#define LONG_SUB	sub
+#define LONG_SUBU	subu
+#define LONG_L		lw
+#define LONG_S		sw
+#define LONG_SLL	sll
+#define LONG_SLLV	sllv
+#define LONG_SRL	srl
+#define LONG_SRLV	srlv
+#define LONG_SRA	sra
+#define LONG_SRAV	srav
+
+#define LONG		.word
+#define LONGSIZE	4
+#define LONGMASK	3
+#define LONGLOG		2
+
+
+
+/*
+ * How to add/sub/load/store/shift pointers.
+ */
+#define PTR_ADD		add
+#define PTR_ADDU	addu
+#define PTR_ADDI	addi
+#define PTR_ADDIU	addiu
+#define PTR_SUB		sub
+#define PTR_SUBU	subu
+#define PTR_L		lw
+#define PTR_S		sw
+#define PTR_LA		la
+#define PTR_SLL		sll
+#define PTR_SLLV	sllv
+#define PTR_SRL		srl
+#define PTR_SRLV	srlv
+#define PTR_SRA		sra
+#define PTR_SRAV	srav
+
+#define PTR_SCALESHIFT	2
+
+#define PTR			.word
+#define PTRSIZE		4
+#define PTRLOG		2
+
+
+/*
+ * Some cp0 registers were extended to 64bit for MIPS III.
+ */
+#define MFC0		mfc0
+#define MTC0		mtc0
+
+
+#define SSNOP		sll zero, zero, 1
+
+#endif /* end of __ASM_H__ */