Linux kernel mirror (for testing)
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1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1995, 1996, 1997, 1999, 2001 by Ralf Baechle
7 * Copyright (C) 1999 by Silicon Graphics, Inc.
8 * Copyright (C) 2001 MIPS Technologies, Inc.
9 * Copyright (C) 2002 Maciej W. Rozycki
10 *
11 * Some useful macros for MIPS assembler code
12 *
13 * Some of the routines below contain useless nops that will be optimized
14 * away by gas in -O mode. These nops are however required to fill delay
15 * slots in noreorder mode.
16 */
17#ifndef __ASM_ASM_H
18#define __ASM_ASM_H
19
20#include <linux/config.h>
21#include <asm/sgidefs.h>
22
23#ifndef CAT
24#ifdef __STDC__
25#define __CAT(str1,str2) str1##str2
26#else
27#define __CAT(str1,str2) str1/**/str2
28#endif
29#define CAT(str1,str2) __CAT(str1,str2)
30#endif
31
32/*
33 * PIC specific declarations
34 * Not used for the kernel but here seems to be the right place.
35 */
36#ifdef __PIC__
37#define CPRESTORE(register) \
38 .cprestore register
39#define CPADD(register) \
40 .cpadd register
41#define CPLOAD(register) \
42 .cpload register
43#else
44#define CPRESTORE(register)
45#define CPADD(register)
46#define CPLOAD(register)
47#endif
48
49/*
50 * LEAF - declare leaf routine
51 */
52#define LEAF(symbol) \
53 .globl symbol; \
54 .align 2; \
55 .type symbol,@function; \
56 .ent symbol,0; \
57symbol: .frame sp,0,ra
58
59/*
60 * NESTED - declare nested routine entry point
61 */
62#define NESTED(symbol, framesize, rpc) \
63 .globl symbol; \
64 .align 2; \
65 .type symbol,@function; \
66 .ent symbol,0; \
67symbol: .frame sp, framesize, rpc
68
69/*
70 * END - mark end of function
71 */
72#define END(function) \
73 .end function; \
74 .size function,.-function
75
76/*
77 * EXPORT - export definition of symbol
78 */
79#define EXPORT(symbol) \
80 .globl symbol; \
81symbol:
82
83/*
84 * FEXPORT - export definition of a function symbol
85 */
86#define FEXPORT(symbol) \
87 .globl symbol; \
88 .type symbol,@function; \
89symbol:
90
91/*
92 * ABS - export absolute symbol
93 */
94#define ABS(symbol,value) \
95 .globl symbol; \
96symbol = value
97
98#define PANIC(msg) \
99 .set push; \
100 .set reorder; \
101 PTR_LA a0,8f; \
102 jal panic; \
1039: b 9b; \
104 .set pop; \
105 TEXT(msg)
106
107/*
108 * Print formatted string
109 */
110#define PRINT(string) \
111 .set push; \
112 .set reorder; \
113 PTR_LA a0,8f; \
114 jal printk; \
115 .set pop; \
116 TEXT(string)
117
118#define TEXT(msg) \
119 .pushsection .data; \
1208: .asciiz msg; \
121 .popsection;
122
123/*
124 * Build text tables
125 */
126#define TTABLE(string) \
127 .pushsection .text; \
128 .word 1f; \
129 .popsection \
130 .pushsection .data; \
1311: .asciiz string; \
132 .popsection
133
134/*
135 * MIPS IV pref instruction.
136 * Use with .set noreorder only!
137 *
138 * MIPS IV implementations are free to treat this as a nop. The R5000
139 * is one of them. So we should have an option not to use this instruction.
140 */
141#ifdef CONFIG_CPU_HAS_PREFETCH
142
143#define PREF(hint,addr) \
144 .set push; \
145 .set mips4; \
146 pref hint,addr; \
147 .set pop
148
149#define PREFX(hint,addr) \
150 .set push; \
151 .set mips4; \
152 prefx hint,addr; \
153 .set pop
154
155#else /* !CONFIG_CPU_HAS_PREFETCH */
156
157#define PREF(hint,addr)
158#define PREFX(hint,addr)
159
160#endif /* !CONFIG_CPU_HAS_PREFETCH */
161
162/*
163 * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
164 */
165#if (_MIPS_ISA == _MIPS_ISA_MIPS1)
166#define MOVN(rd,rs,rt) \
167 .set push; \
168 .set reorder; \
169 beqz rt,9f; \
170 move rd,rs; \
171 .set pop; \
1729:
173#define MOVZ(rd,rs,rt) \
174 .set push; \
175 .set reorder; \
176 bnez rt,9f; \
177 move rd,rs; \
178 .set pop; \
1799:
180#endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
181#if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
182#define MOVN(rd,rs,rt) \
183 .set push; \
184 .set noreorder; \
185 bnezl rt,9f; \
186 move rd,rs; \
187 .set pop; \
1889:
189#define MOVZ(rd,rs,rt) \
190 .set push; \
191 .set noreorder; \
192 beqzl rt,9f; \
193 move rd,rs; \
194 .set pop; \
1959:
196#endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
197#if (_MIPS_ISA == _MIPS_ISA_MIPS4 ) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
198 (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
199#define MOVN(rd,rs,rt) \
200 movn rd,rs,rt
201#define MOVZ(rd,rs,rt) \
202 movz rd,rs,rt
203#endif /* MIPS IV, MIPS V, MIPS32 or MIPS64 */
204
205/*
206 * Stack alignment
207 */
208#if (_MIPS_SIM == _MIPS_SIM_ABI32)
209#define ALSZ 7
210#define ALMASK ~7
211#endif
212#if (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64)
213#define ALSZ 15
214#define ALMASK ~15
215#endif
216
217/*
218 * Macros to handle different pointer/register sizes for 32/64-bit code
219 */
220
221/*
222 * Size of a register
223 */
224#ifdef __mips64
225#define SZREG 8
226#else
227#define SZREG 4
228#endif
229
230/*
231 * Use the following macros in assemblercode to load/store registers,
232 * pointers etc.
233 */
234#if (_MIPS_SIM == _MIPS_SIM_ABI32)
235#define REG_S sw
236#define REG_L lw
237#define REG_SUBU subu
238#define REG_ADDU addu
239#endif
240#if (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64)
241#define REG_S sd
242#define REG_L ld
243#define REG_SUBU dsubu
244#define REG_ADDU daddu
245#endif
246
247/*
248 * How to add/sub/load/store/shift C int variables.
249 */
250#if (_MIPS_SZINT == 32)
251#define INT_ADD add
252#define INT_ADDU addu
253#define INT_ADDI addi
254#define INT_ADDIU addiu
255#define INT_SUB sub
256#define INT_SUBU subu
257#define INT_L lw
258#define INT_S sw
259#define INT_SLL sll
260#define INT_SLLV sllv
261#define INT_SRL srl
262#define INT_SRLV srlv
263#define INT_SRA sra
264#define INT_SRAV srav
265#endif
266
267#if (_MIPS_SZINT == 64)
268#define INT_ADD dadd
269#define INT_ADDU daddu
270#define INT_ADDI daddi
271#define INT_ADDIU daddiu
272#define INT_SUB dsub
273#define INT_SUBU dsubu
274#define INT_L ld
275#define INT_S sd
276#define INT_SLL dsll
277#define INT_SLLV dsllv
278#define INT_SRL dsrl
279#define INT_SRLV dsrlv
280#define INT_SRA dsra
281#define INT_SRAV dsrav
282#endif
283
284/*
285 * How to add/sub/load/store/shift C long variables.
286 */
287#if (_MIPS_SZLONG == 32)
288#define LONG_ADD add
289#define LONG_ADDU addu
290#define LONG_ADDI addi
291#define LONG_ADDIU addiu
292#define LONG_SUB sub
293#define LONG_SUBU subu
294#define LONG_L lw
295#define LONG_S sw
296#define LONG_SLL sll
297#define LONG_SLLV sllv
298#define LONG_SRL srl
299#define LONG_SRLV srlv
300#define LONG_SRA sra
301#define LONG_SRAV srav
302
303#define LONG .word
304#define LONGSIZE 4
305#define LONGMASK 3
306#define LONGLOG 2
307#endif
308
309#if (_MIPS_SZLONG == 64)
310#define LONG_ADD dadd
311#define LONG_ADDU daddu
312#define LONG_ADDI daddi
313#define LONG_ADDIU daddiu
314#define LONG_SUB dsub
315#define LONG_SUBU dsubu
316#define LONG_L ld
317#define LONG_S sd
318#define LONG_SLL dsll
319#define LONG_SLLV dsllv
320#define LONG_SRL dsrl
321#define LONG_SRLV dsrlv
322#define LONG_SRA dsra
323#define LONG_SRAV dsrav
324
325#define LONG .dword
326#define LONGSIZE 8
327#define LONGMASK 7
328#define LONGLOG 3
329#endif
330
331/*
332 * How to add/sub/load/store/shift pointers.
333 */
334#if (_MIPS_SZPTR == 32)
335#define PTR_ADD add
336#define PTR_ADDU addu
337#define PTR_ADDI addi
338#define PTR_ADDIU addiu
339#define PTR_SUB sub
340#define PTR_SUBU subu
341#define PTR_L lw
342#define PTR_S sw
343#define PTR_LA la
344#define PTR_SLL sll
345#define PTR_SLLV sllv
346#define PTR_SRL srl
347#define PTR_SRLV srlv
348#define PTR_SRA sra
349#define PTR_SRAV srav
350
351#define PTR_SCALESHIFT 2
352
353#define PTR .word
354#define PTRSIZE 4
355#define PTRLOG 2
356#endif
357
358#if (_MIPS_SZPTR == 64)
359#define PTR_ADD dadd
360#define PTR_ADDU daddu
361#define PTR_ADDI daddi
362#define PTR_ADDIU daddiu
363#define PTR_SUB dsub
364#define PTR_SUBU dsubu
365#define PTR_L ld
366#define PTR_S sd
367#define PTR_LA dla
368#define PTR_SLL dsll
369#define PTR_SLLV dsllv
370#define PTR_SRL dsrl
371#define PTR_SRLV dsrlv
372#define PTR_SRA dsra
373#define PTR_SRAV dsrav
374
375#define PTR_SCALESHIFT 3
376
377#define PTR .dword
378#define PTRSIZE 8
379#define PTRLOG 3
380#endif
381
382/*
383 * Some cp0 registers were extended to 64bit for MIPS III.
384 */
385#if (_MIPS_SIM == _MIPS_SIM_ABI32)
386#define MFC0 mfc0
387#define MTC0 mtc0
388#endif
389#if (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64)
390#define MFC0 dmfc0
391#define MTC0 dmtc0
392#endif
393
394#define SSNOP sll zero,zero,1
395
396#endif /* __ASM_ASM_H */