rt-thread-official/libcpu/mips/common/asm.h

/*
 * 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__ */