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[mirror_ubuntu-focal-kernel.git] / arch / mips / include / asm / stackframe.h
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 * Copyright (C) 2007 Maciej W. Rozycki
10 */
11 #ifndef _ASM_STACKFRAME_H
12 #define _ASM_STACKFRAME_H
13
14 #include <linux/threads.h>
15
16 #include <asm/asm.h>
17 #include <asm/asmmacro.h>
18 #include <asm/mipsregs.h>
19 #include <asm/asm-offsets.h>
20 #include <asm/thread_info.h>
21
22 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
23 #define STATMASK 0x3f
24 #else
25 #define STATMASK 0x1f
26 #endif
27
28 .macro SAVE_AT
29 .set push
30 .set noat
31 LONG_S $1, PT_R1(sp)
32 .set pop
33 .endm
34
35 .macro SAVE_TEMP
36 #ifdef CONFIG_CPU_HAS_SMARTMIPS
37 mflhxu v1
38 LONG_S v1, PT_LO(sp)
39 mflhxu v1
40 LONG_S v1, PT_HI(sp)
41 mflhxu v1
42 LONG_S v1, PT_ACX(sp)
43 #elif !defined(CONFIG_CPU_MIPSR6)
44 mfhi v1
45 #endif
46 #ifdef CONFIG_32BIT
47 LONG_S $8, PT_R8(sp)
48 LONG_S $9, PT_R9(sp)
49 #endif
50 LONG_S $10, PT_R10(sp)
51 LONG_S $11, PT_R11(sp)
52 LONG_S $12, PT_R12(sp)
53 #if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6)
54 LONG_S v1, PT_HI(sp)
55 mflo v1
56 #endif
57 LONG_S $13, PT_R13(sp)
58 LONG_S $14, PT_R14(sp)
59 LONG_S $15, PT_R15(sp)
60 LONG_S $24, PT_R24(sp)
61 #if !defined(CONFIG_CPU_HAS_SMARTMIPS) && !defined(CONFIG_CPU_MIPSR6)
62 LONG_S v1, PT_LO(sp)
63 #endif
64 #ifdef CONFIG_CPU_CAVIUM_OCTEON
65 /*
66 * The Octeon multiplier state is affected by general
67 * multiply instructions. It must be saved before and
68 * kernel code might corrupt it
69 */
70 jal octeon_mult_save
71 #endif
72 .endm
73
74 .macro SAVE_STATIC
75 LONG_S $16, PT_R16(sp)
76 LONG_S $17, PT_R17(sp)
77 LONG_S $18, PT_R18(sp)
78 LONG_S $19, PT_R19(sp)
79 LONG_S $20, PT_R20(sp)
80 LONG_S $21, PT_R21(sp)
81 LONG_S $22, PT_R22(sp)
82 LONG_S $23, PT_R23(sp)
83 LONG_S $30, PT_R30(sp)
84 .endm
85
86 #ifdef CONFIG_SMP
87 .macro get_saved_sp /* SMP variation */
88 ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG
89 #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
90 lui k1, %hi(kernelsp)
91 #else
92 lui k1, %highest(kernelsp)
93 daddiu k1, %higher(kernelsp)
94 dsll k1, 16
95 daddiu k1, %hi(kernelsp)
96 dsll k1, 16
97 #endif
98 LONG_SRL k0, SMP_CPUID_PTRSHIFT
99 LONG_ADDU k1, k0
100 LONG_L k1, %lo(kernelsp)(k1)
101 .endm
102
103 .macro set_saved_sp stackp temp temp2
104 ASM_CPUID_MFC0 \temp, ASM_SMP_CPUID_REG
105 LONG_SRL \temp, SMP_CPUID_PTRSHIFT
106 LONG_S \stackp, kernelsp(\temp)
107 .endm
108 #else /* !CONFIG_SMP */
109 .macro get_saved_sp /* Uniprocessor variation */
110 #ifdef CONFIG_CPU_JUMP_WORKAROUNDS
111 /*
112 * Clear BTB (branch target buffer), forbid RAS (return address
113 * stack) to workaround the Out-of-order Issue in Loongson2F
114 * via its diagnostic register.
115 */
116 move k0, ra
117 jal 1f
118 nop
119 1: jal 1f
120 nop
121 1: jal 1f
122 nop
123 1: jal 1f
124 nop
125 1: move ra, k0
126 li k0, 3
127 mtc0 k0, $22
128 #endif /* CONFIG_CPU_JUMP_WORKAROUNDS */
129 #if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
130 lui k1, %hi(kernelsp)
131 #else
132 lui k1, %highest(kernelsp)
133 daddiu k1, %higher(kernelsp)
134 dsll k1, k1, 16
135 daddiu k1, %hi(kernelsp)
136 dsll k1, k1, 16
137 #endif
138 LONG_L k1, %lo(kernelsp)(k1)
139 .endm
140
141 .macro set_saved_sp stackp temp temp2
142 LONG_S \stackp, kernelsp
143 .endm
144 #endif
145
146 .macro SAVE_SOME
147 .set push
148 .set noat
149 .set reorder
150 mfc0 k0, CP0_STATUS
151 sll k0, 3 /* extract cu0 bit */
152 .set noreorder
153 bltz k0, 8f
154 move k1, sp
155 #ifdef CONFIG_EVA
156 /*
157 * Flush interAptiv's Return Prediction Stack (RPS) by writing
158 * EntryHi. Toggling Config7.RPS is slower and less portable.
159 *
160 * The RPS isn't automatically flushed when exceptions are
161 * taken, which can result in kernel mode speculative accesses
162 * to user addresses if the RPS mispredicts. That's harmless
163 * when user and kernel share the same address space, but with
164 * EVA the same user segments may be unmapped to kernel mode,
165 * even containing sensitive MMIO regions or invalid memory.
166 *
167 * This can happen when the kernel sets the return address to
168 * ret_from_* and jr's to the exception handler, which looks
169 * more like a tail call than a function call. If nested calls
170 * don't evict the last user address in the RPS, it will
171 * mispredict the return and fetch from a user controlled
172 * address into the icache.
173 *
174 * More recent EVA-capable cores with MAAR to restrict
175 * speculative accesses aren't affected.
176 */
177 MFC0 k0, CP0_ENTRYHI
178 MTC0 k0, CP0_ENTRYHI
179 #endif
180 .set reorder
181 /* Called from user mode, new stack. */
182 get_saved_sp
183 #ifndef CONFIG_CPU_DADDI_WORKAROUNDS
184 8: move k0, sp
185 PTR_SUBU sp, k1, PT_SIZE
186 #else
187 .set at=k0
188 8: PTR_SUBU k1, PT_SIZE
189 .set noat
190 move k0, sp
191 move sp, k1
192 #endif
193 LONG_S k0, PT_R29(sp)
194 LONG_S $3, PT_R3(sp)
195 /*
196 * You might think that you don't need to save $0,
197 * but the FPU emulator and gdb remote debug stub
198 * need it to operate correctly
199 */
200 LONG_S $0, PT_R0(sp)
201 mfc0 v1, CP0_STATUS
202 LONG_S $2, PT_R2(sp)
203 LONG_S v1, PT_STATUS(sp)
204 LONG_S $4, PT_R4(sp)
205 mfc0 v1, CP0_CAUSE
206 LONG_S $5, PT_R5(sp)
207 LONG_S v1, PT_CAUSE(sp)
208 LONG_S $6, PT_R6(sp)
209 MFC0 v1, CP0_EPC
210 LONG_S $7, PT_R7(sp)
211 #ifdef CONFIG_64BIT
212 LONG_S $8, PT_R8(sp)
213 LONG_S $9, PT_R9(sp)
214 #endif
215 LONG_S v1, PT_EPC(sp)
216 LONG_S $25, PT_R25(sp)
217 LONG_S $28, PT_R28(sp)
218 LONG_S $31, PT_R31(sp)
219
220 /* Set thread_info if we're coming from user mode */
221 mfc0 k0, CP0_STATUS
222 sll k0, 3 /* extract cu0 bit */
223 bltz k0, 9f
224
225 ori $28, sp, _THREAD_MASK
226 xori $28, _THREAD_MASK
227 #ifdef CONFIG_CPU_CAVIUM_OCTEON
228 .set mips64
229 pref 0, 0($28) /* Prefetch the current pointer */
230 #endif
231 9:
232 .set pop
233 .endm
234
235 .macro SAVE_ALL
236 SAVE_SOME
237 SAVE_AT
238 SAVE_TEMP
239 SAVE_STATIC
240 .endm
241
242 .macro RESTORE_AT
243 .set push
244 .set noat
245 LONG_L $1, PT_R1(sp)
246 .set pop
247 .endm
248
249 .macro RESTORE_TEMP
250 #ifdef CONFIG_CPU_CAVIUM_OCTEON
251 /* Restore the Octeon multiplier state */
252 jal octeon_mult_restore
253 #endif
254 #ifdef CONFIG_CPU_HAS_SMARTMIPS
255 LONG_L $24, PT_ACX(sp)
256 mtlhx $24
257 LONG_L $24, PT_HI(sp)
258 mtlhx $24
259 LONG_L $24, PT_LO(sp)
260 mtlhx $24
261 #elif !defined(CONFIG_CPU_MIPSR6)
262 LONG_L $24, PT_LO(sp)
263 mtlo $24
264 LONG_L $24, PT_HI(sp)
265 mthi $24
266 #endif
267 #ifdef CONFIG_32BIT
268 LONG_L $8, PT_R8(sp)
269 LONG_L $9, PT_R9(sp)
270 #endif
271 LONG_L $10, PT_R10(sp)
272 LONG_L $11, PT_R11(sp)
273 LONG_L $12, PT_R12(sp)
274 LONG_L $13, PT_R13(sp)
275 LONG_L $14, PT_R14(sp)
276 LONG_L $15, PT_R15(sp)
277 LONG_L $24, PT_R24(sp)
278 .endm
279
280 .macro RESTORE_STATIC
281 LONG_L $16, PT_R16(sp)
282 LONG_L $17, PT_R17(sp)
283 LONG_L $18, PT_R18(sp)
284 LONG_L $19, PT_R19(sp)
285 LONG_L $20, PT_R20(sp)
286 LONG_L $21, PT_R21(sp)
287 LONG_L $22, PT_R22(sp)
288 LONG_L $23, PT_R23(sp)
289 LONG_L $30, PT_R30(sp)
290 .endm
291
292 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
293
294 .macro RESTORE_SOME
295 .set push
296 .set reorder
297 .set noat
298 mfc0 a0, CP0_STATUS
299 li v1, ST0_CU1 | ST0_IM
300 ori a0, STATMASK
301 xori a0, STATMASK
302 mtc0 a0, CP0_STATUS
303 and a0, v1
304 LONG_L v0, PT_STATUS(sp)
305 nor v1, $0, v1
306 and v0, v1
307 or v0, a0
308 mtc0 v0, CP0_STATUS
309 LONG_L $31, PT_R31(sp)
310 LONG_L $28, PT_R28(sp)
311 LONG_L $25, PT_R25(sp)
312 LONG_L $7, PT_R7(sp)
313 LONG_L $6, PT_R6(sp)
314 LONG_L $5, PT_R5(sp)
315 LONG_L $4, PT_R4(sp)
316 LONG_L $3, PT_R3(sp)
317 LONG_L $2, PT_R2(sp)
318 .set pop
319 .endm
320
321 .macro RESTORE_SP_AND_RET
322 .set push
323 .set noreorder
324 LONG_L k0, PT_EPC(sp)
325 LONG_L sp, PT_R29(sp)
326 jr k0
327 rfe
328 .set pop
329 .endm
330
331 #else
332 .macro RESTORE_SOME
333 .set push
334 .set reorder
335 .set noat
336 mfc0 a0, CP0_STATUS
337 ori a0, STATMASK
338 xori a0, STATMASK
339 mtc0 a0, CP0_STATUS
340 li v1, ST0_CU1 | ST0_FR | ST0_IM
341 and a0, v1
342 LONG_L v0, PT_STATUS(sp)
343 nor v1, $0, v1
344 and v0, v1
345 or v0, a0
346 mtc0 v0, CP0_STATUS
347 LONG_L v1, PT_EPC(sp)
348 MTC0 v1, CP0_EPC
349 LONG_L $31, PT_R31(sp)
350 LONG_L $28, PT_R28(sp)
351 LONG_L $25, PT_R25(sp)
352 #ifdef CONFIG_64BIT
353 LONG_L $8, PT_R8(sp)
354 LONG_L $9, PT_R9(sp)
355 #endif
356 LONG_L $7, PT_R7(sp)
357 LONG_L $6, PT_R6(sp)
358 LONG_L $5, PT_R5(sp)
359 LONG_L $4, PT_R4(sp)
360 LONG_L $3, PT_R3(sp)
361 LONG_L $2, PT_R2(sp)
362 .set pop
363 .endm
364
365 .macro RESTORE_SP_AND_RET
366 LONG_L sp, PT_R29(sp)
367 #ifdef CONFIG_CPU_MIPSR6
368 eretnc
369 #else
370 .set arch=r4000
371 eret
372 .set mips0
373 #endif
374 .endm
375
376 #endif
377
378 .macro RESTORE_SP
379 LONG_L sp, PT_R29(sp)
380 .endm
381
382 .macro RESTORE_ALL
383 RESTORE_TEMP
384 RESTORE_STATIC
385 RESTORE_AT
386 RESTORE_SOME
387 RESTORE_SP
388 .endm
389
390 /*
391 * Move to kernel mode and disable interrupts.
392 * Set cp0 enable bit as sign that we're running on the kernel stack
393 */
394 .macro CLI
395 mfc0 t0, CP0_STATUS
396 li t1, ST0_CU0 | STATMASK
397 or t0, t1
398 xori t0, STATMASK
399 mtc0 t0, CP0_STATUS
400 irq_disable_hazard
401 .endm
402
403 /*
404 * Move to kernel mode and enable interrupts.
405 * Set cp0 enable bit as sign that we're running on the kernel stack
406 */
407 .macro STI
408 mfc0 t0, CP0_STATUS
409 li t1, ST0_CU0 | STATMASK
410 or t0, t1
411 xori t0, STATMASK & ~1
412 mtc0 t0, CP0_STATUS
413 irq_enable_hazard
414 .endm
415
416 /*
417 * Just move to kernel mode and leave interrupts as they are. Note
418 * for the R3000 this means copying the previous enable from IEp.
419 * Set cp0 enable bit as sign that we're running on the kernel stack
420 */
421 .macro KMODE
422 mfc0 t0, CP0_STATUS
423 li t1, ST0_CU0 | (STATMASK & ~1)
424 #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
425 andi t2, t0, ST0_IEP
426 srl t2, 2
427 or t0, t2
428 #endif
429 or t0, t1
430 xori t0, STATMASK & ~1
431 mtc0 t0, CP0_STATUS
432 irq_disable_hazard
433 .endm
434
435 #endif /* _ASM_STACKFRAME_H */
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