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vfs: remove superflous sb == NULL checks
[linux-2.6/verdex.git] / include / asm-mips / stackframe.h
blob7afa1fdf70ca6a5dcba909b985869f66c72aca76
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) 1994, 95, 96, 99, 2001 Ralf Baechle
7 * Copyright (C) 1994, 1995, 1996 Paul M. Antoine.
8 * Copyright (C) 1999 Silicon Graphics, Inc.
9 */
10 #ifndef _ASM_STACKFRAME_H
11 #define _ASM_STACKFRAME_H
12
13 #include <linux/threads.h>
14
15 #include <asm/asm.h>
16 #include <asm/asmmacro.h>
17 #include <asm/mipsregs.h>
18 #include <asm/asm-offsets.h>
19
20 #ifdef CONFIG_MIPS_MT_SMTC
21 #include <asm/mipsmtregs.h>
22 #endif /* CONFIG_MIPS_MT_SMTC */
23
24 .macro SAVE_AT
25 .set push
26 .set noat
27 LONG_S $1, PT_R1(sp)
28 .set pop
29 .endm
30
31 .macro SAVE_TEMP
32 #ifdef CONFIG_CPU_HAS_SMARTMIPS
33 mflhxu v1
34 LONG_S v1, PT_LO(sp)
35 mflhxu v1
36 LONG_S v1, PT_HI(sp)
37 mflhxu v1
38 LONG_S v1, PT_ACX(sp)
39 #else
40 mfhi v1
41 LONG_S v1, PT_HI(sp)
42 mflo v1
43 LONG_S v1, PT_LO(sp)
44 #endif
45 #ifdef CONFIG_32BIT
46 LONG_S $8, PT_R8(sp)
47 LONG_S $9, PT_R9(sp)
48 #endif
49 LONG_S $10, PT_R10(sp)
50 LONG_S $11, PT_R11(sp)
51 LONG_S $12, PT_R12(sp)
52 LONG_S $13, PT_R13(sp)
53 LONG_S $14, PT_R14(sp)
54 LONG_S $15, PT_R15(sp)
55 LONG_S $24, PT_R24(sp)
56 .endm
57
58 .macro SAVE_STATIC
59 LONG_S $16, PT_R16(sp)
60 LONG_S $17, PT_R17(sp)
61 LONG_S $18, PT_R18(sp)
62 LONG_S $19, PT_R19(sp)
63 LONG_S $20, PT_R20(sp)
64 LONG_S $21, PT_R21(sp)
65 LONG_S $22, PT_R22(sp)
66 LONG_S $23, PT_R23(sp)
67 LONG_S $30, PT_R30(sp)
68 .endm
69
70 #ifdef CONFIG_SMP
71 #ifdef CONFIG_MIPS_MT_SMTC
72 #define PTEBASE_SHIFT 19 /* TCBIND */
73 #else
74 #define PTEBASE_SHIFT 23 /* CONTEXT */
75 #endif
76 .macro get_saved_sp /* SMP variation */
77 #ifdef CONFIG_MIPS_MT_SMTC
78 mfc0 k0, CP0_TCBIND
79 #else
80 MFC0 k0, CP0_CONTEXT
81 #endif
82 #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
83 lui k1, %highest(kernelsp)
84 daddiu k1, %higher(kernelsp)
85 dsll k1, 16
86 daddiu k1, %hi(kernelsp)
87 dsll k1, 16
88 #else
89 lui k1, %hi(kernelsp)
90 #endif
91 LONG_SRL k0, PTEBASE_SHIFT
92 LONG_ADDU k1, k0
93 LONG_L k1, %lo(kernelsp)(k1)
94 .endm
95
96 .macro set_saved_sp stackp temp temp2
97 #ifdef CONFIG_MIPS_MT_SMTC
98 mfc0 \temp, CP0_TCBIND
99 #else
100 MFC0 \temp, CP0_CONTEXT
101 #endif
102 LONG_SRL \temp, PTEBASE_SHIFT
103 LONG_S \stackp, kernelsp(\temp)
104 .endm
105 #else
106 .macro get_saved_sp /* Uniprocessor variation */
107 #if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
108 lui k1, %highest(kernelsp)
109 daddiu k1, %higher(kernelsp)
110 dsll k1, k1, 16
111 daddiu k1, %hi(kernelsp)
112 dsll k1, k1, 16
113 #else
114 lui k1, %hi(kernelsp)
115 #endif
116 LONG_L k1, %lo(kernelsp)(k1)
117 .endm
118
119 .macro set_saved_sp stackp temp temp2
120 LONG_S \stackp, kernelsp
121 .endm
122 #endif
123
124 .macro SAVE_SOME
125 .set push
126 .set noat
127 .set reorder
128 mfc0 k0, CP0_STATUS
129 sll k0, 3 /* extract cu0 bit */
130 .set noreorder
131 bltz k0, 8f
132 move k1, sp
133 .set reorder
134 /* Called from user mode, new stack. */
135 get_saved_sp
136 8: move k0, sp
137 PTR_SUBU sp, k1, PT_SIZE
138 LONG_S k0, PT_R29(sp)
139 LONG_S $3, PT_R3(sp)
140 /*
141 * You might think that you don't need to save $0,
142 * but the FPU emulator and gdb remote debug stub
143 * need it to operate correctly
144 */
145 LONG_S $0, PT_R0(sp)
146 mfc0 v1, CP0_STATUS
147 LONG_S $2, PT_R2(sp)
148 LONG_S v1, PT_STATUS(sp)
149 #ifdef CONFIG_MIPS_MT_SMTC
150 /*
151 * Ideally, these instructions would be shuffled in
152 * to cover the pipeline delay.
153 */
154 .set mips32
155 mfc0 v1, CP0_TCSTATUS
156 .set mips0
157 LONG_S v1, PT_TCSTATUS(sp)
158 #endif /* CONFIG_MIPS_MT_SMTC */
159 LONG_S $4, PT_R4(sp)
160 mfc0 v1, CP0_CAUSE
161 LONG_S $5, PT_R5(sp)
162 LONG_S v1, PT_CAUSE(sp)
163 LONG_S $6, PT_R6(sp)
164 MFC0 v1, CP0_EPC
165 LONG_S $7, PT_R7(sp)
166 #ifdef CONFIG_64BIT
167 LONG_S $8, PT_R8(sp)
168 LONG_S $9, PT_R9(sp)
169 #endif
170 LONG_S v1, PT_EPC(sp)
171 LONG_S $25, PT_R25(sp)
172 LONG_S $28, PT_R28(sp)
173 LONG_S $31, PT_R31(sp)
174 ori $28, sp, _THREAD_MASK
175 xori $28, _THREAD_MASK
176 .set pop
177 .endm
178
179 .macro SAVE_ALL
180 SAVE_SOME
181 SAVE_AT
182 SAVE_TEMP
183 SAVE_STATIC
184 .endm
185
186 .macro RESTORE_AT
187 .set push
188 .set noat
189 LONG_L $1, PT_R1(sp)
190 .set pop
191 .endm
192
193 .macro RESTORE_TEMP
194 #ifdef CONFIG_CPU_HAS_SMARTMIPS
195 LONG_L $24, PT_ACX(sp)
196 mtlhx $24
197 LONG_L $24, PT_HI(sp)
198 mtlhx $24
199 LONG_L $24, PT_LO(sp)
200 mtlhx $24
201 #else
202 LONG_L $24, PT_LO(sp)
203 mtlo $24
204 LONG_L $24, PT_HI(sp)
205 mthi $24
206 #endif
207 #ifdef CONFIG_32BIT
208 LONG_L $8, PT_R8(sp)
209 LONG_L $9, PT_R9(sp)
210 #endif
211 LONG_L $10, PT_R10(sp)
212 LONG_L $11, PT_R11(sp)
213 LONG_L $12, PT_R12(sp)
214 LONG_L $13, PT_R13(sp)
215 LONG_L $14, PT_R14(sp)
216 LONG_L $15, PT_R15(sp)
217 LONG_L $24, PT_R24(sp)
218 .endm
219
220 .macro RESTORE_STATIC
221 LONG_L $16, PT_R16(sp)
222 LONG_L $17, PT_R17(sp)
223 LONG_L $18, PT_R18(sp)
224 LONG_L $19, PT_R19(sp)
225 LONG_L $20, PT_R20(sp)
226 LONG_L $21, PT_R21(sp)
227 LONG_L $22, PT_R22(sp)
228 LONG_L $23, PT_R23(sp)
229 LONG_L $30, PT_R30(sp)
230 .endm
231
232 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
233
234 .macro RESTORE_SOME
235 .set push
236 .set reorder
237 .set noat
238 mfc0 a0, CP0_STATUS
239 ori a0, 0x1f
240 xori a0, 0x1f
241 mtc0 a0, CP0_STATUS
242 li v1, 0xff00
243 and a0, v1
244 LONG_L v0, PT_STATUS(sp)
245 nor v1, $0, v1
246 and v0, v1
247 or v0, a0
248 mtc0 v0, CP0_STATUS
249 LONG_L $31, PT_R31(sp)
250 LONG_L $28, PT_R28(sp)
251 LONG_L $25, PT_R25(sp)
252 #ifdef CONFIG_64BIT
253 LONG_L $8, PT_R8(sp)
254 LONG_L $9, PT_R9(sp)
255 #endif
256 LONG_L $7, PT_R7(sp)
257 LONG_L $6, PT_R6(sp)
258 LONG_L $5, PT_R5(sp)
259 LONG_L $4, PT_R4(sp)
260 LONG_L $3, PT_R3(sp)
261 LONG_L $2, PT_R2(sp)
262 .set pop
263 .endm
264
265 .macro RESTORE_SP_AND_RET
266 .set push
267 .set noreorder
268 LONG_L k0, PT_EPC(sp)
269 LONG_L sp, PT_R29(sp)
270 jr k0
271 rfe
272 .set pop
273 .endm
274
275 #else
276 /*
277 * For SMTC kernel, global IE should be left set, and interrupts
278 * controlled exclusively via IXMT.
279 */
280
281 #ifdef CONFIG_MIPS_MT_SMTC
282 #define STATMASK 0x1e
283 #else
284 #define STATMASK 0x1f
285 #endif
286 .macro RESTORE_SOME
287 .set push
288 .set reorder
289 .set noat
290 #ifdef CONFIG_MIPS_MT_SMTC
291 .set mips32r2
292 /*
293 * This may not really be necessary if ints are already
294 * inhibited here.
295 */
296 mfc0 v0, CP0_TCSTATUS
297 ori v0, TCSTATUS_IXMT
298 mtc0 v0, CP0_TCSTATUS
299 _ehb
300 DMT 5 # dmt a1
301 jal mips_ihb
302 #endif /* CONFIG_MIPS_MT_SMTC */
303 mfc0 a0, CP0_STATUS
304 ori a0, STATMASK
305 xori a0, STATMASK
306 mtc0 a0, CP0_STATUS
307 li v1, 0xff00
308 and a0, v1
309 LONG_L v0, PT_STATUS(sp)
310 nor v1, $0, v1
311 and v0, v1
312 or v0, a0
313 mtc0 v0, CP0_STATUS
314 #ifdef CONFIG_MIPS_MT_SMTC
315 /*
316 * Only after EXL/ERL have been restored to status can we
317 * restore TCStatus.IXMT.
318 */
319 LONG_L v1, PT_TCSTATUS(sp)
320 _ehb
321 mfc0 v0, CP0_TCSTATUS
322 andi v1, TCSTATUS_IXMT
323 /* We know that TCStatua.IXMT should be set from above */
324 xori v0, v0, TCSTATUS_IXMT
325 or v0, v0, v1
326 mtc0 v0, CP0_TCSTATUS
327 _ehb
328 andi a1, a1, VPECONTROL_TE
329 beqz a1, 1f
330 emt
331 1:
332 .set mips0
333 #endif /* CONFIG_MIPS_MT_SMTC */
334 LONG_L v1, PT_EPC(sp)
335 MTC0 v1, CP0_EPC
336 LONG_L $31, PT_R31(sp)
337 LONG_L $28, PT_R28(sp)
338 LONG_L $25, PT_R25(sp)
339 #ifdef CONFIG_64BIT
340 LONG_L $8, PT_R8(sp)
341 LONG_L $9, PT_R9(sp)
342 #endif
343 LONG_L $7, PT_R7(sp)
344 LONG_L $6, PT_R6(sp)
345 LONG_L $5, PT_R5(sp)
346 LONG_L $4, PT_R4(sp)
347 LONG_L $3, PT_R3(sp)
348 LONG_L $2, PT_R2(sp)
349 .set pop
350 .endm
351
352 .macro RESTORE_SP_AND_RET
353 LONG_L sp, PT_R29(sp)
354 .set mips3
355 eret
356 .set mips0
357 .endm
358
359 #endif
360
361 .macro RESTORE_SP
362 LONG_L sp, PT_R29(sp)
363 .endm
364
365 .macro RESTORE_ALL
366 RESTORE_TEMP
367 RESTORE_STATIC
368 RESTORE_AT
369 RESTORE_SOME
370 RESTORE_SP
371 .endm
372
373 .macro RESTORE_ALL_AND_RET
374 RESTORE_TEMP
375 RESTORE_STATIC
376 RESTORE_AT
377 RESTORE_SOME
378 RESTORE_SP_AND_RET
379 .endm
380
381 /*
382 * Move to kernel mode and disable interrupts.
383 * Set cp0 enable bit as sign that we're running on the kernel stack
384 */
385 .macro CLI
386 #if !defined(CONFIG_MIPS_MT_SMTC)
387 mfc0 t0, CP0_STATUS
388 li t1, ST0_CU0 | 0x1f
389 or t0, t1
390 xori t0, 0x1f
391 mtc0 t0, CP0_STATUS
392 #else /* CONFIG_MIPS_MT_SMTC */
393 /*
394 * For SMTC, we need to set privilege
395 * and disable interrupts only for the
396 * current TC, using the TCStatus register.
397 */
398 mfc0 t0,CP0_TCSTATUS
399 /* Fortunately CU 0 is in the same place in both registers */
400 /* Set TCU0, TMX, TKSU (for later inversion) and IXMT */
401 li t1, ST0_CU0 | 0x08001c00
402 or t0,t1
403 /* Clear TKSU, leave IXMT */
404 xori t0, 0x00001800
405 mtc0 t0, CP0_TCSTATUS
406 _ehb
407 /* We need to leave the global IE bit set, but clear EXL...*/
408 mfc0 t0, CP0_STATUS
409 ori t0, ST0_EXL | ST0_ERL
410 xori t0, ST0_EXL | ST0_ERL
411 mtc0 t0, CP0_STATUS
412 #endif /* CONFIG_MIPS_MT_SMTC */
413 irq_disable_hazard
414 .endm
415
416 /*
417 * Move to kernel mode and enable interrupts.
418 * Set cp0 enable bit as sign that we're running on the kernel stack
419 */
420 .macro STI
421 #if !defined(CONFIG_MIPS_MT_SMTC)
422 mfc0 t0, CP0_STATUS
423 li t1, ST0_CU0 | 0x1f
424 or t0, t1
425 xori t0, 0x1e
426 mtc0 t0, CP0_STATUS
427 #else /* CONFIG_MIPS_MT_SMTC */
428 /*
429 * For SMTC, we need to set privilege
430 * and enable interrupts only for the
431 * current TC, using the TCStatus register.
432 */
433 _ehb
434 mfc0 t0,CP0_TCSTATUS
435 /* Fortunately CU 0 is in the same place in both registers */
436 /* Set TCU0, TKSU (for later inversion) and IXMT */
437 li t1, ST0_CU0 | 0x08001c00
438 or t0,t1
439 /* Clear TKSU *and* IXMT */
440 xori t0, 0x00001c00
441 mtc0 t0, CP0_TCSTATUS
442 _ehb
443 /* We need to leave the global IE bit set, but clear EXL...*/
444 mfc0 t0, CP0_STATUS
445 ori t0, ST0_EXL
446 xori t0, ST0_EXL
447 mtc0 t0, CP0_STATUS
448 /* irq_enable_hazard below should expand to EHB for 24K/34K cpus */
449 #endif /* CONFIG_MIPS_MT_SMTC */
450 irq_enable_hazard
451 .endm
452
453 /*
454 * Just move to kernel mode and leave interrupts as they are.
455 * Set cp0 enable bit as sign that we're running on the kernel stack
456 */
457 .macro KMODE
458 #ifdef CONFIG_MIPS_MT_SMTC
459 /*
460 * This gets baroque in SMTC. We want to
461 * protect the non-atomic clearing of EXL
462 * with DMT/EMT, but we don't want to take
463 * an interrupt while DMT is still in effect.
464 */
465
466 /* KMODE gets invoked from both reorder and noreorder code */
467 .set push
468 .set mips32r2
469 .set noreorder
470 mfc0 v0, CP0_TCSTATUS
471 andi v1, v0, TCSTATUS_IXMT
472 ori v0, TCSTATUS_IXMT
473 mtc0 v0, CP0_TCSTATUS
474 _ehb
475 DMT 2 # dmt v0
476 /*
477 * We don't know a priori if ra is "live"
478 */
479 move t0, ra
480 jal mips_ihb
481 nop /* delay slot */
482 move ra, t0
483 #endif /* CONFIG_MIPS_MT_SMTC */
484 mfc0 t0, CP0_STATUS
485 li t1, ST0_CU0 | 0x1e
486 or t0, t1
487 xori t0, 0x1e
488 mtc0 t0, CP0_STATUS
489 #ifdef CONFIG_MIPS_MT_SMTC
490 _ehb
491 andi v0, v0, VPECONTROL_TE
492 beqz v0, 2f
493 nop /* delay slot */
494 emt
495 2:
496 mfc0 v0, CP0_TCSTATUS
497 /* Clear IXMT, then OR in previous value */
498 ori v0, TCSTATUS_IXMT
499 xori v0, TCSTATUS_IXMT
500 or v0, v1, v0
501 mtc0 v0, CP0_TCSTATUS
502 /*
503 * irq_disable_hazard below should expand to EHB
504 * on 24K/34K CPUS
505 */
506 .set pop
507 #endif /* CONFIG_MIPS_MT_SMTC */
508 irq_disable_hazard
509 .endm
510
511 #endif /* _ASM_STACKFRAME_H */
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