asm.h
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上传日期:2013-02-24
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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.
- *
- * 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_ASM_H
- #define __ASM_ASM_H
- #include <asm/sgidefs.h>
- /*
- * PIC specific declarations
- * Not used for the kernel but here seems to be the right place.
- */
- #ifdef __PIC__
- #define CPRESTORE(register)
- .cprestore register
- #define CPADD(register)
- .cpadd register
- #define CPLOAD(register)
- .cpload register
- #else
- #define CPRESTORE(register)
- #define CPADD(register)
- #define CPLOAD(register)
- #endif
- /*
- * 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:
- /*
- * ABS - export absolute symbol
- */
- #define ABS(symbol,value)
- .globl symbol;
- symbol = value
- #define PANIC(msg)
- .set push;
- .set reorder;
- la a0,8f;
- jal panic;
- 9: b 9b;
- .set pop;
- TEXT(msg)
- /*
- * Print formatted string
- */
- #define PRINT(string)
- .set push;
- .set reorder;
- la a0,8f;
- jal printk;
- .set pop;
- TEXT(string)
- #define TEXT(msg)
- .data;
- 8: .asciiz msg;
- .previous;
- /*
- * Build text tables
- */
- #define TTABLE(string)
- .text;
- .word 1f;
- .previous;
- .data;
- 1: .asciz string;
- .previous
- /*
- * MIPS IV pref instruction.
- * Use with .set noreorder only!
- *
- * MIPS IV implementations are free to treat this as a nop. The R5000
- * is one of them. So we should have an option not to use this instruction.
- */
- #if (_MIPS_ISA == _MIPS_ISA_MIPS4 ) || (_MIPS_ISA == _MIPS_ISA_MIPS5) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS64)
- #define PREF(hint,addr)
- pref hint,addr
- #define PREFX(hint,addr)
- prefx hint,addr
- #else
- #define PREF
- #define PREFX
- #endif
- /*
- * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
- */
- #if _MIPS_ISA == _MIPS_ISA_MIPS1
- #define MOVN(rd,rs,rt)
- .set push;
- .set reorder;
- beqz rt,9f;
- move rd,rs;
- .set pop;
- 9:
- #define MOVZ(rd,rs,rt)
- .set push;
- .set reorder;
- bnez rt,9f;
- move rd,rt;
- .set pop;
- 9:
- #endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
- #if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
- #define MOVN(rd,rs,rt)
- .set push;
- .set noreorder;
- bnezl rt,9f;
- move rd,rs;
- .set pop;
- 9:
- #define MOVZ(rd,rs,rt)
- .set push;
- .set noreorder;
- beqzl rt,9f;
- movz rd,rs;
- .set pop;
- 9:
- #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
- #if (_MIPS_ISA == _MIPS_ISA_MIPS4 ) || (_MIPS_ISA == _MIPS_ISA_MIPS5) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS64)
- #define MOVN(rd,rs,rt)
- movn rd,rs,rt
- #define MOVZ(rd,rs,rt)
- movz rd,rs,rt
- #endif /* MIPS IV, MIPS V or MIPS64 */
- /*
- * Stack alignment
- */
- #if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS32)
- #define ALSZ 7
- #define ALMASK ~7
- #endif
- #if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
- #define ALSZ 15
- #define ALMASK ~15
- #endif
- /*
- * Size of a register
- */
- #ifdef __mips64
- #define SZREG 8
- #else
- #define SZREG 4
- #endif
- /*
- * Use the following macros in assemblercode to load/store registers,
- * pointers etc.
- */
- #if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS32)
- #define REG_S sw
- #define REG_L lw
- #define PTR_SUBU dsubu
- #define PTR_ADDU daddu
- #endif
- #if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
- #define REG_S sd
- #define REG_L ld
- /* We still live in a 32 bit address space ... */
- #define PTR_SUBU dsubu
- #define PTR_ADDU daddu
- #endif
- /*
- * How to add/sub/load/store/shift C int variables.
- */
- #if (_MIPS_SZINT == 32)
- #define INT_ADD add
- #define INT_ADDI addi
- #define INT_ADDU addu
- #define INT_ADDIU addiu
- #define INT_SUB add
- #define INT_SUBI subi
- #define INT_SUBU subu
- #define INT_SUBIU subu
- #define INT_L lw
- #define INT_S sw
- #endif
- #if (_MIPS_SZINT == 64)
- #define INT_ADD dadd
- #define INT_ADDI daddi
- #define INT_ADDU daddu
- #define INT_ADDIU daddiu
- #define INT_SUB dadd
- #define INT_SUBI dsubi
- #define INT_SUBU dsubu
- #define INT_SUBIU dsubu
- #define INT_L ld
- #define INT_S sd
- #endif
- /*
- * How to add/sub/load/store/shift C long variables.
- */
- #if (_MIPS_SZLONG == 32)
- #define LONG_ADD add
- #define LONG_ADDI addi
- #define LONG_ADDU addu
- #define LONG_ADDIU addiu
- #define LONG_SUB add
- #define LONG_SUBI subi
- #define LONG_SUBU subu
- #define LONG_SUBIU 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
- #endif
- #if (_MIPS_SZLONG == 64)
- #define LONG_ADD dadd
- #define LONG_ADDI daddi
- #define LONG_ADDU daddu
- #define LONG_ADDIU daddiu
- #define LONG_SUB dadd
- #define LONG_SUBI dsubi
- #define LONG_SUBU dsubu
- #define LONG_SUBIU dsubu
- #define LONG_L ld
- #define LONG_S sd
- #define LONG_SLL dsll
- #define LONG_SLLV dsllv
- #define LONG_SRL dsrl
- #define LONG_SRLV dsrlv
- #define LONG_SRA dsra
- #define LONG_SRAV dsrav
- #endif
- /*
- * How to add/sub/load/store/shift pointers.
- */
- #if (_MIPS_SZPTR == 32)
- #define PTR_ADD add
- #define PTR_ADDI addi
- #define PTR_ADDU addu
- #define PTR_ADDIU addiu
- #define PTR_SUB add
- #define PTR_SUBI subi
- #define PTR_SUBU subu
- #define PTR_SUBIU subu
- #define PTR_L lw
- #define PTR_S sw
- #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
- #endif
- #if (_MIPS_SZPTR == 64)
- #define PTR_ADD dadd
- #define PTR_ADDI daddi
- #define PTR_ADDU daddu
- #define PTR_ADDIU daddiu
- #define PTR_SUB dadd
- #define PTR_SUBI dsubi
- #define PTR_SUBU dsubu
- #define PTR_SUBIU dsubu
- #define PTR_L ld
- #define PTR_S sd
- #define PTR_SLL dsll
- #define PTR_SLLV dsllv
- #define PTR_SRL dsrl
- #define PTR_SRLV dsrlv
- #define PTR_SRA dsra
- #define PTR_SRAV dsrav
- #define PTR_SCALESHIFT 3
- #define PTR .dword
- #define PTRSIZE 8
- #define PTRLOG 3
- #endif
- /*
- * Some cp0 registers were extended to 64bit for MIPS III.
- */
- #if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS32)
- #define MFC0 mfc0
- #define MTC0 mtc0
- #endif
- #if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) ||
- (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
- #define MFC0 dmfc0
- #define MTC0 dmtc0
- #endif
- #endif /* __ASM_ASM_H */