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-rw-r--r--include/asm-mips/stackframe.h346
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diff --git a/include/asm-mips/stackframe.h b/include/asm-mips/stackframe.h
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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) 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/config.h>
14#include <linux/threads.h>
15
16#include <asm/asm.h>
17#include <asm/mipsregs.h>
18#include <asm/offset.h>
19
20 .macro SAVE_AT
21 .set push
22 .set noat
23 LONG_S $1, PT_R1(sp)
24 .set pop
25 .endm
26
27 .macro SAVE_TEMP
28 mfhi v1
29#ifdef CONFIG_MIPS32
30 LONG_S $8, PT_R8(sp)
31 LONG_S $9, PT_R9(sp)
32#endif
33 LONG_S v1, PT_HI(sp)
34 mflo v1
35 LONG_S $10, PT_R10(sp)
36 LONG_S $11, PT_R11(sp)
37 LONG_S v1, PT_LO(sp)
38 LONG_S $12, PT_R12(sp)
39 LONG_S $13, PT_R13(sp)
40 LONG_S $14, PT_R14(sp)
41 LONG_S $15, PT_R15(sp)
42 LONG_S $24, PT_R24(sp)
43 .endm
44
45 .macro SAVE_STATIC
46 LONG_S $16, PT_R16(sp)
47 LONG_S $17, PT_R17(sp)
48 LONG_S $18, PT_R18(sp)
49 LONG_S $19, PT_R19(sp)
50 LONG_S $20, PT_R20(sp)
51 LONG_S $21, PT_R21(sp)
52 LONG_S $22, PT_R22(sp)
53 LONG_S $23, PT_R23(sp)
54 LONG_S $30, PT_R30(sp)
55 .endm
56
57#ifdef CONFIG_SMP
58 .macro get_saved_sp /* SMP variation */
59#ifdef CONFIG_MIPS32
60 mfc0 k0, CP0_CONTEXT
61 lui k1, %hi(kernelsp)
62 srl k0, k0, 23
63 sll k0, k0, 2
64 addu k1, k0
65 LONG_L k1, %lo(kernelsp)(k1)
66#endif
67#if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
68 MFC0 k1, CP0_CONTEXT
69 dsra k1, 23
70 lui k0, %hi(pgd_current)
71 addiu k0, %lo(pgd_current)
72 dsubu k1, k0
73 lui k0, %hi(kernelsp)
74 daddu k1, k0
75 LONG_L k1, %lo(kernelsp)(k1)
76#endif
77#if defined(CONFIG_MIPS64) && defined(CONFIG_BUILD_ELF64)
78 MFC0 k1, CP0_CONTEXT
79 dsrl k1, 23
80 dsll k1, k1, 3
81 LONG_L k1, kernelsp(k1)
82#endif
83 .endm
84
85 .macro set_saved_sp stackp temp temp2
86#ifdef CONFIG_MIPS32
87 mfc0 \temp, CP0_CONTEXT
88 srl \temp, 23
89 sll \temp, 2
90 LONG_S \stackp, kernelsp(\temp)
91#endif
92#if defined(CONFIG_MIPS64) && !defined(CONFIG_BUILD_ELF64)
93 lw \temp, TI_CPU(gp)
94 dsll \temp, 3
95 lui \temp2, %hi(kernelsp)
96 daddu \temp, \temp2
97 LONG_S \stackp, %lo(kernelsp)(\temp)
98#endif
99#if defined(CONFIG_MIPS64) && defined(CONFIG_BUILD_ELF64)
100 lw \temp, TI_CPU(gp)
101 dsll \temp, 3
102 LONG_S \stackp, kernelsp(\temp)
103#endif
104 .endm
105#else
106 .macro get_saved_sp /* Uniprocessor variation */
107 lui k1, %hi(kernelsp)
108 LONG_L k1, %lo(kernelsp)(k1)
109 .endm
110
111 .macro set_saved_sp stackp temp temp2
112 LONG_S \stackp, kernelsp
113 .endm
114#endif
115
116 .macro SAVE_SOME
117 .set push
118 .set noat
119 .set reorder
120 mfc0 k0, CP0_STATUS
121 sll k0, 3 /* extract cu0 bit */
122 .set noreorder
123 bltz k0, 8f
124 move k1, sp
125 .set reorder
126 /* Called from user mode, new stack. */
127 get_saved_sp
1288: move k0, sp
129 PTR_SUBU sp, k1, PT_SIZE
130 LONG_S k0, PT_R29(sp)
131 LONG_S $3, PT_R3(sp)
132 LONG_S $0, PT_R0(sp)
133 mfc0 v1, CP0_STATUS
134 LONG_S $2, PT_R2(sp)
135 LONG_S v1, PT_STATUS(sp)
136 LONG_S $4, PT_R4(sp)
137 mfc0 v1, CP0_CAUSE
138 LONG_S $5, PT_R5(sp)
139 LONG_S v1, PT_CAUSE(sp)
140 LONG_S $6, PT_R6(sp)
141 MFC0 v1, CP0_EPC
142 LONG_S $7, PT_R7(sp)
143#ifdef CONFIG_MIPS64
144 LONG_S $8, PT_R8(sp)
145 LONG_S $9, PT_R9(sp)
146#endif
147 LONG_S v1, PT_EPC(sp)
148 LONG_S $25, PT_R25(sp)
149 LONG_S $28, PT_R28(sp)
150 LONG_S $31, PT_R31(sp)
151 ori $28, sp, _THREAD_MASK
152 xori $28, _THREAD_MASK
153 .set pop
154 .endm
155
156 .macro SAVE_ALL
157 SAVE_SOME
158 SAVE_AT
159 SAVE_TEMP
160 SAVE_STATIC
161 .endm
162
163 .macro RESTORE_AT
164 .set push
165 .set noat
166 LONG_L $1, PT_R1(sp)
167 .set pop
168 .endm
169
170 .macro RESTORE_TEMP
171 LONG_L $24, PT_LO(sp)
172#ifdef CONFIG_MIPS32
173 LONG_L $8, PT_R8(sp)
174 LONG_L $9, PT_R9(sp)
175#endif
176 mtlo $24
177 LONG_L $24, PT_HI(sp)
178 LONG_L $10, PT_R10(sp)
179 LONG_L $11, PT_R11(sp)
180 mthi $24
181 LONG_L $12, PT_R12(sp)
182 LONG_L $13, PT_R13(sp)
183 LONG_L $14, PT_R14(sp)
184 LONG_L $15, PT_R15(sp)
185 LONG_L $24, PT_R24(sp)
186 .endm
187
188 .macro RESTORE_STATIC
189 LONG_L $16, PT_R16(sp)
190 LONG_L $17, PT_R17(sp)
191 LONG_L $18, PT_R18(sp)
192 LONG_L $19, PT_R19(sp)
193 LONG_L $20, PT_R20(sp)
194 LONG_L $21, PT_R21(sp)
195 LONG_L $22, PT_R22(sp)
196 LONG_L $23, PT_R23(sp)
197 LONG_L $30, PT_R30(sp)
198 .endm
199
200#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
201
202 .macro RESTORE_SOME
203 .set push
204 .set reorder
205 .set noat
206 mfc0 a0, CP0_STATUS
207 ori a0, 0x1f
208 xori a0, 0x1f
209 mtc0 a0, CP0_STATUS
210 li v1, 0xff00
211 and a0, v1
212 LONG_L v0, PT_STATUS(sp)
213 nor v1, $0, v1
214 and v0, v1
215 or v0, a0
216 mtc0 v0, CP0_STATUS
217 LONG_L $31, PT_R31(sp)
218 LONG_L $28, PT_R28(sp)
219 LONG_L $25, PT_R25(sp)
220#ifdef CONFIG_MIPS64
221 LONG_L $8, PT_R8(sp)
222 LONG_L $9, PT_R9(sp)
223#endif
224 LONG_L $7, PT_R7(sp)
225 LONG_L $6, PT_R6(sp)
226 LONG_L $5, PT_R5(sp)
227 LONG_L $4, PT_R4(sp)
228 LONG_L $3, PT_R3(sp)
229 LONG_L $2, PT_R2(sp)
230 .set pop
231 .endm
232
233 .macro RESTORE_SP_AND_RET
234 .set push
235 .set noreorder
236 LONG_L k0, PT_EPC(sp)
237 LONG_L sp, PT_R29(sp)
238 jr k0
239 rfe
240 .set pop
241 .endm
242
243#else
244
245 .macro RESTORE_SOME
246 .set push
247 .set reorder
248 .set noat
249 mfc0 a0, CP0_STATUS
250 ori a0, 0x1f
251 xori a0, 0x1f
252 mtc0 a0, CP0_STATUS
253 li v1, 0xff00
254 and a0, v1
255 LONG_L v0, PT_STATUS(sp)
256 nor v1, $0, v1
257 and v0, v1
258 or v0, a0
259 mtc0 v0, CP0_STATUS
260 LONG_L v1, PT_EPC(sp)
261 MTC0 v1, CP0_EPC
262 LONG_L $31, PT_R31(sp)
263 LONG_L $28, PT_R28(sp)
264 LONG_L $25, PT_R25(sp)
265#ifdef CONFIG_MIPS64
266 LONG_L $8, PT_R8(sp)
267 LONG_L $9, PT_R9(sp)
268#endif
269 LONG_L $7, PT_R7(sp)
270 LONG_L $6, PT_R6(sp)
271 LONG_L $5, PT_R5(sp)
272 LONG_L $4, PT_R4(sp)
273 LONG_L $3, PT_R3(sp)
274 LONG_L $2, PT_R2(sp)
275 .set pop
276 .endm
277
278 .macro RESTORE_SP_AND_RET
279 LONG_L sp, PT_R29(sp)
280 .set mips3
281 eret
282 .set mips0
283 .endm
284
285#endif
286
287 .macro RESTORE_SP
288 LONG_L sp, PT_R29(sp)
289 .endm
290
291 .macro RESTORE_ALL
292 RESTORE_TEMP
293 RESTORE_STATIC
294 RESTORE_AT
295 RESTORE_SOME
296 RESTORE_SP
297 .endm
298
299 .macro RESTORE_ALL_AND_RET
300 RESTORE_TEMP
301 RESTORE_STATIC
302 RESTORE_AT
303 RESTORE_SOME
304 RESTORE_SP_AND_RET
305 .endm
306
307/*
308 * Move to kernel mode and disable interrupts.
309 * Set cp0 enable bit as sign that we're running on the kernel stack
310 */
311 .macro CLI
312 mfc0 t0, CP0_STATUS
313 li t1, ST0_CU0 | 0x1f
314 or t0, t1
315 xori t0, 0x1f
316 mtc0 t0, CP0_STATUS
317 irq_disable_hazard
318 .endm
319
320/*
321 * Move to kernel mode and enable interrupts.
322 * Set cp0 enable bit as sign that we're running on the kernel stack
323 */
324 .macro STI
325 mfc0 t0, CP0_STATUS
326 li t1, ST0_CU0 | 0x1f
327 or t0, t1
328 xori t0, 0x1e
329 mtc0 t0, CP0_STATUS
330 irq_enable_hazard
331 .endm
332
333/*
334 * Just move to kernel mode and leave interrupts as they are.
335 * Set cp0 enable bit as sign that we're running on the kernel stack
336 */
337 .macro KMODE
338 mfc0 t0, CP0_STATUS
339 li t1, ST0_CU0 | 0x1e
340 or t0, t1
341 xori t0, 0x1e
342 mtc0 t0, CP0_STATUS
343 irq_disable_hazard
344 .endm
345
346#endif /* _ASM_STACKFRAME_H */
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