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/config.h>
14#include <linux/threads.h>
15
16#include <asm/asm.h>
17#include <asm/mipsregs.h>
18#include <asm/asm-offsets.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_32BIT
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_32BIT
60 mfc0 k0, CP0_CONTEXT
61 lui k1, %hi(kernelsp)
62 srl k0, k0, 23
63 addu k1, k0
64 LONG_L k1, %lo(kernelsp)(k1)
65#endif
66#ifdef CONFIG_64BIT
67 MFC0 k1, CP0_CONTEXT
68 lui k0, %highest(kernelsp)
69 dsrl k1, 23
70 daddiu k0, %higher(kernelsp)
71 dsll k0, k0, 16
72 daddiu k0, %hi(kernelsp)
73 dsll k0, k0, 16
74 daddu k1, k1, k0
75 LONG_L k1, %lo(kernelsp)(k1)
76#endif
77 .endm
78
79 .macro set_saved_sp stackp temp temp2
80#ifdef CONFIG_32BIT
81 mfc0 \temp, CP0_CONTEXT
82 srl \temp, 23
83#endif
84#ifdef CONFIG_64BIT
85 MFC0 \temp, CP0_CONTEXT
86 dsrl \temp, 23
87#endif
88 LONG_S \stackp, kernelsp(\temp)
89 .endm
90#else
91 .macro get_saved_sp /* Uniprocessor variation */
92#ifdef CONFIG_64BIT
93 lui k1, %highest(kernelsp)
94 daddiu k1, %higher(kernelsp)
95 dsll k1, k1, 16
96 daddiu k1, %hi(kernelsp)
97 dsll k1, k1, 16
98#else
99 lui k1, %hi(kernelsp)
100#endif
101 LONG_L k1, %lo(kernelsp)(k1)
102 .endm
103
104 .macro set_saved_sp stackp temp temp2
105 LONG_S \stackp, kernelsp
106 .endm
107#endif
108
109 .macro SAVE_SOME
110 .set push
111 .set noat
112 .set reorder
113 mfc0 k0, CP0_STATUS
114 sll k0, 3 /* extract cu0 bit */
115 .set noreorder
116 bltz k0, 8f
117 move k1, sp
118 .set reorder
119 /* Called from user mode, new stack. */
120 get_saved_sp
1218: move k0, sp
122 PTR_SUBU sp, k1, PT_SIZE
123 LONG_S k0, PT_R29(sp)
124 LONG_S $3, PT_R3(sp)
125 LONG_S $0, PT_R0(sp)
126 mfc0 v1, CP0_STATUS
127 LONG_S $2, PT_R2(sp)
128 LONG_S v1, PT_STATUS(sp)
129 LONG_S $4, PT_R4(sp)
130 mfc0 v1, CP0_CAUSE
131 LONG_S $5, PT_R5(sp)
132 LONG_S v1, PT_CAUSE(sp)
133 LONG_S $6, PT_R6(sp)
134 MFC0 v1, CP0_EPC
135 LONG_S $7, PT_R7(sp)
136#ifdef CONFIG_64BIT
137 LONG_S $8, PT_R8(sp)
138 LONG_S $9, PT_R9(sp)
139#endif
140 LONG_S v1, PT_EPC(sp)
141 LONG_S $25, PT_R25(sp)
142 LONG_S $28, PT_R28(sp)
143 LONG_S $31, PT_R31(sp)
144 ori $28, sp, _THREAD_MASK
145 xori $28, _THREAD_MASK
146 .set pop
147 .endm
148
149 .macro SAVE_ALL
150 SAVE_SOME
151 SAVE_AT
152 SAVE_TEMP
153 SAVE_STATIC
154 .endm
155
156 .macro RESTORE_AT
157 .set push
158 .set noat
159 LONG_L $1, PT_R1(sp)
160 .set pop
161 .endm
162
163 .macro RESTORE_TEMP
164 LONG_L $24, PT_LO(sp)
165#ifdef CONFIG_32BIT
166 LONG_L $8, PT_R8(sp)
167 LONG_L $9, PT_R9(sp)
168#endif
169 mtlo $24
170 LONG_L $24, PT_HI(sp)
171 LONG_L $10, PT_R10(sp)
172 LONG_L $11, PT_R11(sp)
173 mthi $24
174 LONG_L $12, PT_R12(sp)
175 LONG_L $13, PT_R13(sp)
176 LONG_L $14, PT_R14(sp)
177 LONG_L $15, PT_R15(sp)
178 LONG_L $24, PT_R24(sp)
179 .endm
180
181 .macro RESTORE_STATIC
182 LONG_L $16, PT_R16(sp)
183 LONG_L $17, PT_R17(sp)
184 LONG_L $18, PT_R18(sp)
185 LONG_L $19, PT_R19(sp)
186 LONG_L $20, PT_R20(sp)
187 LONG_L $21, PT_R21(sp)
188 LONG_L $22, PT_R22(sp)
189 LONG_L $23, PT_R23(sp)
190 LONG_L $30, PT_R30(sp)
191 .endm
192
193#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
194
195 .macro RESTORE_SOME
196 .set push
197 .set reorder
198 .set noat
199 mfc0 a0, CP0_STATUS
200 ori a0, 0x1f
201 xori a0, 0x1f
202 mtc0 a0, CP0_STATUS
203 li v1, 0xff00
204 and a0, v1
205 LONG_L v0, PT_STATUS(sp)
206 nor v1, $0, v1
207 and v0, v1
208 or v0, a0
209 mtc0 v0, CP0_STATUS
210 LONG_L $31, PT_R31(sp)
211 LONG_L $28, PT_R28(sp)
212 LONG_L $25, PT_R25(sp)
213#ifdef CONFIG_64BIT
214 LONG_L $8, PT_R8(sp)
215 LONG_L $9, PT_R9(sp)
216#endif
217 LONG_L $7, PT_R7(sp)
218 LONG_L $6, PT_R6(sp)
219 LONG_L $5, PT_R5(sp)
220 LONG_L $4, PT_R4(sp)
221 LONG_L $3, PT_R3(sp)
222 LONG_L $2, PT_R2(sp)
223 .set pop
224 .endm
225
226 .macro RESTORE_SP_AND_RET
227 .set push
228 .set noreorder
229 LONG_L k0, PT_EPC(sp)
230 LONG_L sp, PT_R29(sp)
231 jr k0
232 rfe
233 .set pop
234 .endm
235
236#else
237
238 .macro RESTORE_SOME
239 .set push
240 .set reorder
241 .set noat
242 mfc0 a0, CP0_STATUS
243 ori a0, 0x1f
244 xori a0, 0x1f
245 mtc0 a0, CP0_STATUS
246 li v1, 0xff00
247 and a0, v1
248 LONG_L v0, PT_STATUS(sp)
249 nor v1, $0, v1
250 and v0, v1
251 or v0, a0
252 mtc0 v0, CP0_STATUS
253 LONG_L v1, PT_EPC(sp)
254 MTC0 v1, CP0_EPC
255 LONG_L $31, PT_R31(sp)
256 LONG_L $28, PT_R28(sp)
257 LONG_L $25, PT_R25(sp)
258#ifdef CONFIG_64BIT
259 LONG_L $8, PT_R8(sp)
260 LONG_L $9, PT_R9(sp)
261#endif
262 LONG_L $7, PT_R7(sp)
263 LONG_L $6, PT_R6(sp)
264 LONG_L $5, PT_R5(sp)
265 LONG_L $4, PT_R4(sp)
266 LONG_L $3, PT_R3(sp)
267 LONG_L $2, PT_R2(sp)
268 .set pop
269 .endm
270
271 .macro RESTORE_SP_AND_RET
272 LONG_L sp, PT_R29(sp)
273 .set mips3
274 eret
275 .set mips0
276 .endm
277
278#endif
279
280 .macro RESTORE_SP
281 LONG_L sp, PT_R29(sp)
282 .endm
283
284 .macro RESTORE_ALL
285 RESTORE_TEMP
286 RESTORE_STATIC
287 RESTORE_AT
288 RESTORE_SOME
289 RESTORE_SP
290 .endm
291
292 .macro RESTORE_ALL_AND_RET
293 RESTORE_TEMP
294 RESTORE_STATIC
295 RESTORE_AT
296 RESTORE_SOME
297 RESTORE_SP_AND_RET
298 .endm
299
300/*
301 * Move to kernel mode and disable interrupts.
302 * Set cp0 enable bit as sign that we're running on the kernel stack
303 */
304 .macro CLI
305 mfc0 t0, CP0_STATUS
306 li t1, ST0_CU0 | 0x1f
307 or t0, t1
308 xori t0, 0x1f
309 mtc0 t0, CP0_STATUS
310 irq_disable_hazard
311 .endm
312
313/*
314 * Move to kernel mode and enable interrupts.
315 * Set cp0 enable bit as sign that we're running on the kernel stack
316 */
317 .macro STI
318 mfc0 t0, CP0_STATUS
319 li t1, ST0_CU0 | 0x1f
320 or t0, t1
321 xori t0, 0x1e
322 mtc0 t0, CP0_STATUS
323 irq_enable_hazard
324 .endm
325
326/*
327 * Just move to kernel mode and leave interrupts as they are.
328 * Set cp0 enable bit as sign that we're running on the kernel stack
329 */
330 .macro KMODE
331 mfc0 t0, CP0_STATUS
332 li t1, ST0_CU0 | 0x1e
333 or t0, t1
334 xori t0, 0x1e
335 mtc0 t0, CP0_STATUS
336 irq_disable_hazard
337 .endm
338
339#endif /* _ASM_STACKFRAME_H */