Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 mfhi v1
33#ifdef CONFIG_32BIT
34 LONG_S $8, PT_R8(sp)
35 LONG_S $9, PT_R9(sp)
36#endif
37 LONG_S v1, PT_HI(sp)
38 mflo v1
39 LONG_S $10, PT_R10(sp)
40 LONG_S $11, PT_R11(sp)
41 LONG_S v1, PT_LO(sp)
42 LONG_S $12, PT_R12(sp)
43 LONG_S $13, PT_R13(sp)
44 LONG_S $14, PT_R14(sp)
45 LONG_S $15, PT_R15(sp)
46 LONG_S $24, PT_R24(sp)
47 .endm
48
49 .macro SAVE_STATIC
50 LONG_S $16, PT_R16(sp)
51 LONG_S $17, PT_R17(sp)
52 LONG_S $18, PT_R18(sp)
53 LONG_S $19, PT_R19(sp)
54 LONG_S $20, PT_R20(sp)
55 LONG_S $21, PT_R21(sp)
56 LONG_S $22, PT_R22(sp)
57 LONG_S $23, PT_R23(sp)
58 LONG_S $30, PT_R30(sp)
59 .endm
60
61#ifdef CONFIG_SMP
62 .macro get_saved_sp /* SMP variation */
63#ifdef CONFIG_32BIT
64#ifdef CONFIG_MIPS_MT_SMTC
65 .set mips32
66 mfc0 k0, CP0_TCBIND;
67 .set mips0
68 lui k1, %hi(kernelsp)
69 srl k0, k0, 19
70 /* No need to shift down and up to clear bits 0-1 */
71#else
72 mfc0 k0, CP0_CONTEXT
73 lui k1, %hi(kernelsp)
74 srl k0, k0, 23
75#endif
76 addu k1, k0
77 LONG_L k1, %lo(kernelsp)(k1)
78#endif
79#ifdef CONFIG_64BIT
80#ifdef CONFIG_MIPS_MT_SMTC
81 .set mips64
82 mfc0 k0, CP0_TCBIND;
83 .set mips0
84 lui k0, %highest(kernelsp)
85 dsrl k1, 19
86 /* No need to shift down and up to clear bits 0-2 */
87#else
88 MFC0 k1, CP0_CONTEXT
89 lui k0, %highest(kernelsp)
90 dsrl k1, 23
91 daddiu k0, %higher(kernelsp)
92 dsll k0, k0, 16
93 daddiu k0, %hi(kernelsp)
94 dsll k0, k0, 16
95#endif /* CONFIG_MIPS_MT_SMTC */
96 daddu k1, k1, k0
97 LONG_L k1, %lo(kernelsp)(k1)
98#endif /* CONFIG_64BIT */
99 .endm
100
101 .macro set_saved_sp stackp temp temp2
102#ifdef CONFIG_32BIT
103#ifdef CONFIG_MIPS_MT_SMTC
104 mfc0 \temp, CP0_TCBIND
105 srl \temp, 19
106#else
107 mfc0 \temp, CP0_CONTEXT
108 srl \temp, 23
109#endif
110#endif
111#ifdef CONFIG_64BIT
112#ifdef CONFIG_MIPS_MT_SMTC
113 mfc0 \temp, CP0_TCBIND
114 dsrl \temp, 19
115#else
116 MFC0 \temp, CP0_CONTEXT
117 dsrl \temp, 23
118#endif
119#endif
120 LONG_S \stackp, kernelsp(\temp)
121 .endm
122#else
123 .macro get_saved_sp /* Uniprocessor variation */
124#ifdef CONFIG_64BIT
125 lui k1, %highest(kernelsp)
126 daddiu k1, %higher(kernelsp)
127 dsll k1, k1, 16
128 daddiu k1, %hi(kernelsp)
129 dsll k1, k1, 16
130#else
131 lui k1, %hi(kernelsp)
132#endif
133 LONG_L k1, %lo(kernelsp)(k1)
134 .endm
135
136 .macro set_saved_sp stackp temp temp2
137 LONG_S \stackp, kernelsp
138 .endm
139#endif
140
141 .macro SAVE_SOME
142 .set push
143 .set noat
144 .set reorder
145 mfc0 k0, CP0_STATUS
146 sll k0, 3 /* extract cu0 bit */
147 .set noreorder
148 bltz k0, 8f
149 move k1, sp
150 .set reorder
151 /* Called from user mode, new stack. */
152 get_saved_sp
1538: move k0, sp
154 PTR_SUBU sp, k1, PT_SIZE
155 LONG_S k0, PT_R29(sp)
156 LONG_S $3, PT_R3(sp)
157 /*
158 * You might think that you don't need to save $0,
159 * but the FPU emulator and gdb remote debug stub
160 * need it to operate correctly
161 */
162 LONG_S $0, PT_R0(sp)
163 mfc0 v1, CP0_STATUS
164 LONG_S $2, PT_R2(sp)
165 LONG_S v1, PT_STATUS(sp)
166#ifdef CONFIG_MIPS_MT_SMTC
167 /*
168 * Ideally, these instructions would be shuffled in
169 * to cover the pipeline delay.
170 */
171 .set mips32
172 mfc0 v1, CP0_TCSTATUS
173 .set mips0
174 LONG_S v1, PT_TCSTATUS(sp)
175#endif /* CONFIG_MIPS_MT_SMTC */
176 LONG_S $4, PT_R4(sp)
177 mfc0 v1, CP0_CAUSE
178 LONG_S $5, PT_R5(sp)
179 LONG_S v1, PT_CAUSE(sp)
180 LONG_S $6, PT_R6(sp)
181 MFC0 v1, CP0_EPC
182 LONG_S $7, PT_R7(sp)
183#ifdef CONFIG_64BIT
184 LONG_S $8, PT_R8(sp)
185 LONG_S $9, PT_R9(sp)
186#endif
187 LONG_S v1, PT_EPC(sp)
188 LONG_S $25, PT_R25(sp)
189 LONG_S $28, PT_R28(sp)
190 LONG_S $31, PT_R31(sp)
191 ori $28, sp, _THREAD_MASK
192 xori $28, _THREAD_MASK
193 .set pop
194 .endm
195
196 .macro SAVE_ALL
197 SAVE_SOME
198 SAVE_AT
199 SAVE_TEMP
200 SAVE_STATIC
201 .endm
202
203 .macro RESTORE_AT
204 .set push
205 .set noat
206 LONG_L $1, PT_R1(sp)
207 .set pop
208 .endm
209
210 .macro RESTORE_TEMP
211 LONG_L $24, PT_LO(sp)
212#ifdef CONFIG_32BIT
213 LONG_L $8, PT_R8(sp)
214 LONG_L $9, PT_R9(sp)
215#endif
216 mtlo $24
217 LONG_L $24, PT_HI(sp)
218 LONG_L $10, PT_R10(sp)
219 LONG_L $11, PT_R11(sp)
220 mthi $24
221 LONG_L $12, PT_R12(sp)
222 LONG_L $13, PT_R13(sp)
223 LONG_L $14, PT_R14(sp)
224 LONG_L $15, PT_R15(sp)
225 LONG_L $24, PT_R24(sp)
226 .endm
227
228 .macro RESTORE_STATIC
229 LONG_L $16, PT_R16(sp)
230 LONG_L $17, PT_R17(sp)
231 LONG_L $18, PT_R18(sp)
232 LONG_L $19, PT_R19(sp)
233 LONG_L $20, PT_R20(sp)
234 LONG_L $21, PT_R21(sp)
235 LONG_L $22, PT_R22(sp)
236 LONG_L $23, PT_R23(sp)
237 LONG_L $30, PT_R30(sp)
238 .endm
239
240#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
241
242 .macro RESTORE_SOME
243 .set push
244 .set reorder
245 .set noat
246 mfc0 a0, CP0_STATUS
247 ori a0, 0x1f
248 xori a0, 0x1f
249 mtc0 a0, CP0_STATUS
250 li v1, 0xff00
251 and a0, v1
252 LONG_L v0, PT_STATUS(sp)
253 nor v1, $0, v1
254 and v0, v1
255 or v0, a0
256 mtc0 v0, CP0_STATUS
257 LONG_L $31, PT_R31(sp)
258 LONG_L $28, PT_R28(sp)
259 LONG_L $25, PT_R25(sp)
260#ifdef CONFIG_64BIT
261 LONG_L $8, PT_R8(sp)
262 LONG_L $9, PT_R9(sp)
263#endif
264 LONG_L $7, PT_R7(sp)
265 LONG_L $6, PT_R6(sp)
266 LONG_L $5, PT_R5(sp)
267 LONG_L $4, PT_R4(sp)
268 LONG_L $3, PT_R3(sp)
269 LONG_L $2, PT_R2(sp)
270 .set pop
271 .endm
272
273 .macro RESTORE_SP_AND_RET
274 .set push
275 .set noreorder
276 LONG_L k0, PT_EPC(sp)
277 LONG_L sp, PT_R29(sp)
278 jr k0
279 rfe
280 .set pop
281 .endm
282
283#else
284/*
285 * For SMTC kernel, global IE should be left set, and interrupts
286 * controlled exclusively via IXMT.
287 */
288
289#ifdef CONFIG_MIPS_MT_SMTC
290#define STATMASK 0x1e
291#else
292#define STATMASK 0x1f
293#endif
294 .macro RESTORE_SOME
295 .set push
296 .set reorder
297 .set noat
298#ifdef CONFIG_MIPS_MT_SMTC
299 .set mips32r2
300 /*
301 * This may not really be necessary if ints are already
302 * inhibited here.
303 */
304 mfc0 v0, CP0_TCSTATUS
305 ori v0, TCSTATUS_IXMT
306 mtc0 v0, CP0_TCSTATUS
307 _ehb
308 DMT 5 # dmt a1
309 jal mips_ihb
310#endif /* CONFIG_MIPS_MT_SMTC */
311 mfc0 a0, CP0_STATUS
312 ori a0, STATMASK
313 xori a0, STATMASK
314 mtc0 a0, CP0_STATUS
315 li v1, 0xff00
316 and a0, v1
317 LONG_L v0, PT_STATUS(sp)
318 nor v1, $0, v1
319 and v0, v1
320 or v0, a0
321 mtc0 v0, CP0_STATUS
322#ifdef CONFIG_MIPS_MT_SMTC
323/*
324 * Only after EXL/ERL have been restored to status can we
325 * restore TCStatus.IXMT.
326 */
327 LONG_L v1, PT_TCSTATUS(sp)
328 _ehb
329 mfc0 v0, CP0_TCSTATUS
330 andi v1, TCSTATUS_IXMT
331 /* We know that TCStatua.IXMT should be set from above */
332 xori v0, v0, TCSTATUS_IXMT
333 or v0, v0, v1
334 mtc0 v0, CP0_TCSTATUS
335 _ehb
336 andi a1, a1, VPECONTROL_TE
337 beqz a1, 1f
338 emt
3391:
340 .set mips0
341#endif /* CONFIG_MIPS_MT_SMTC */
342 LONG_L v1, PT_EPC(sp)
343 MTC0 v1, CP0_EPC
344 LONG_L $31, PT_R31(sp)
345 LONG_L $28, PT_R28(sp)
346 LONG_L $25, PT_R25(sp)
347#ifdef CONFIG_64BIT
348 LONG_L $8, PT_R8(sp)
349 LONG_L $9, PT_R9(sp)
350#endif
351 LONG_L $7, PT_R7(sp)
352 LONG_L $6, PT_R6(sp)
353 LONG_L $5, PT_R5(sp)
354 LONG_L $4, PT_R4(sp)
355 LONG_L $3, PT_R3(sp)
356 LONG_L $2, PT_R2(sp)
357 .set pop
358 .endm
359
360 .macro RESTORE_SP_AND_RET
361 LONG_L sp, PT_R29(sp)
362 .set mips3
363 eret
364 .set mips0
365 .endm
366
367#endif
368
369 .macro RESTORE_SP
370 LONG_L sp, PT_R29(sp)
371 .endm
372
373 .macro RESTORE_ALL
374 RESTORE_TEMP
375 RESTORE_STATIC
376 RESTORE_AT
377 RESTORE_SOME
378 RESTORE_SP
379 .endm
380
381 .macro RESTORE_ALL_AND_RET
382 RESTORE_TEMP
383 RESTORE_STATIC
384 RESTORE_AT
385 RESTORE_SOME
386 RESTORE_SP_AND_RET
387 .endm
388
389/*
390 * Move to kernel mode and disable interrupts.
391 * Set cp0 enable bit as sign that we're running on the kernel stack
392 */
393 .macro CLI
394#if !defined(CONFIG_MIPS_MT_SMTC)
395 mfc0 t0, CP0_STATUS
396 li t1, ST0_CU0 | 0x1f
397 or t0, t1
398 xori t0, 0x1f
399 mtc0 t0, CP0_STATUS
400#else /* CONFIG_MIPS_MT_SMTC */
401 /*
402 * For SMTC, we need to set privilege
403 * and disable interrupts only for the
404 * current TC, using the TCStatus register.
405 */
406 mfc0 t0,CP0_TCSTATUS
407 /* Fortunately CU 0 is in the same place in both registers */
408 /* Set TCU0, TMX, TKSU (for later inversion) and IXMT */
409 li t1, ST0_CU0 | 0x08001c00
410 or t0,t1
411 /* Clear TKSU, leave IXMT */
412 xori t0, 0x00001800
413 mtc0 t0, CP0_TCSTATUS
414 _ehb
415 /* We need to leave the global IE bit set, but clear EXL...*/
416 mfc0 t0, CP0_STATUS
417 ori t0, ST0_EXL | ST0_ERL
418 xori t0, ST0_EXL | ST0_ERL
419 mtc0 t0, CP0_STATUS
420#endif /* CONFIG_MIPS_MT_SMTC */
421 irq_disable_hazard
422 .endm
423
424/*
425 * Move to kernel mode and enable interrupts.
426 * Set cp0 enable bit as sign that we're running on the kernel stack
427 */
428 .macro STI
429#if !defined(CONFIG_MIPS_MT_SMTC)
430 mfc0 t0, CP0_STATUS
431 li t1, ST0_CU0 | 0x1f
432 or t0, t1
433 xori t0, 0x1e
434 mtc0 t0, CP0_STATUS
435#else /* CONFIG_MIPS_MT_SMTC */
436 /*
437 * For SMTC, we need to set privilege
438 * and enable interrupts only for the
439 * current TC, using the TCStatus register.
440 */
441 _ehb
442 mfc0 t0,CP0_TCSTATUS
443 /* Fortunately CU 0 is in the same place in both registers */
444 /* Set TCU0, TKSU (for later inversion) and IXMT */
445 li t1, ST0_CU0 | 0x08001c00
446 or t0,t1
447 /* Clear TKSU *and* IXMT */
448 xori t0, 0x00001c00
449 mtc0 t0, CP0_TCSTATUS
450 _ehb
451 /* We need to leave the global IE bit set, but clear EXL...*/
452 mfc0 t0, CP0_STATUS
453 ori t0, ST0_EXL
454 xori t0, ST0_EXL
455 mtc0 t0, CP0_STATUS
456 /* irq_enable_hazard below should expand to EHB for 24K/34K cpus */
457#endif /* CONFIG_MIPS_MT_SMTC */
458 irq_enable_hazard
459 .endm
460
461/*
462 * Just move to kernel mode and leave interrupts as they are.
463 * Set cp0 enable bit as sign that we're running on the kernel stack
464 */
465 .macro KMODE
466#ifdef CONFIG_MIPS_MT_SMTC
467 /*
468 * This gets baroque in SMTC. We want to
469 * protect the non-atomic clearing of EXL
470 * with DMT/EMT, but we don't want to take
471 * an interrupt while DMT is still in effect.
472 */
473
474 /* KMODE gets invoked from both reorder and noreorder code */
475 .set push
476 .set mips32r2
477 .set noreorder
478 mfc0 v0, CP0_TCSTATUS
479 andi v1, v0, TCSTATUS_IXMT
480 ori v0, TCSTATUS_IXMT
481 mtc0 v0, CP0_TCSTATUS
482 _ehb
483 DMT 2 # dmt v0
484 /*
485 * We don't know a priori if ra is "live"
486 */
487 move t0, ra
488 jal mips_ihb
489 nop /* delay slot */
490 move ra, t0
491#endif /* CONFIG_MIPS_MT_SMTC */
492 mfc0 t0, CP0_STATUS
493 li t1, ST0_CU0 | 0x1e
494 or t0, t1
495 xori t0, 0x1e
496 mtc0 t0, CP0_STATUS
497#ifdef CONFIG_MIPS_MT_SMTC
498 _ehb
499 andi v0, v0, VPECONTROL_TE
500 beqz v0, 2f
501 nop /* delay slot */
502 emt
5032:
504 mfc0 v0, CP0_TCSTATUS
505 /* Clear IXMT, then OR in previous value */
506 ori v0, TCSTATUS_IXMT
507 xori v0, TCSTATUS_IXMT
508 or v0, v1, v0
509 mtc0 v0, CP0_TCSTATUS
510 /*
511 * irq_disable_hazard below should expand to EHB
512 * on 24K/34K CPUS
513 */
514 .set pop
515#endif /* CONFIG_MIPS_MT_SMTC */
516 irq_disable_hazard
517 .endm
518
519#endif /* _ASM_STACKFRAME_H */