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#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
67 MFC0 k1, CP0_CONTEXT
68 dsra k1, 23
69 lui k0, %hi(pgd_current)
70 addiu k0, %lo(pgd_current)
71 dsubu k1, k0
72 lui k0, %hi(kernelsp)
73 daddu k1, k0
74 LONG_L k1, %lo(kernelsp)(k1)
75#endif
76#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
77 MFC0 k1, CP0_CONTEXT
78 lui k0, %highest(kernelsp)
79 dsrl k1, 23
80 daddiu k0, %higher(kernelsp)
81 dsll k0, k0, 16
82 daddiu k0, %hi(kernelsp)
83 dsll k0, k0, 16
84 daddu k1, k1, k0
85 LONG_L k1, %lo(kernelsp)(k1)
86#endif
87 .endm
88
89 .macro set_saved_sp stackp temp temp2
90#ifdef CONFIG_32BIT
91 mfc0 \temp, CP0_CONTEXT
92 srl \temp, 23
93#endif
94#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
95 lw \temp, TI_CPU(gp)
96 dsll \temp, 3
97#endif
98#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
99 MFC0 \temp, CP0_CONTEXT
100 dsrl \temp, 23
101#endif
102 LONG_S \stackp, kernelsp(\temp)
103 .endm
104#else
105 .macro get_saved_sp /* Uniprocessor variation */
106#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)
107 lui k1, %highest(kernelsp)
108 daddiu k1, %higher(kernelsp)
109 dsll k1, k1, 16
110 daddiu k1, %hi(kernelsp)
111 dsll k1, k1, 16
112#else
113 lui k1, %hi(kernelsp)
114#endif
115 LONG_L k1, %lo(kernelsp)(k1)
116 .endm
117
118 .macro set_saved_sp stackp temp temp2
119 LONG_S \stackp, kernelsp
120 .endm
121#endif
122
123 .macro SAVE_SOME
124 .set push
125 .set noat
126 .set reorder
127 mfc0 k0, CP0_STATUS
128 sll k0, 3 /* extract cu0 bit */
129 .set noreorder
130 bltz k0, 8f
131 move k1, sp
132 .set reorder
133 /* Called from user mode, new stack. */
134 get_saved_sp
1358: move k0, sp
136 PTR_SUBU sp, k1, PT_SIZE
137 LONG_S k0, PT_R29(sp)
138 LONG_S $3, PT_R3(sp)
139 LONG_S $0, PT_R0(sp)
140 mfc0 v1, CP0_STATUS
141 LONG_S $2, PT_R2(sp)
142 LONG_S v1, PT_STATUS(sp)
143 LONG_S $4, PT_R4(sp)
144 mfc0 v1, CP0_CAUSE
145 LONG_S $5, PT_R5(sp)
146 LONG_S v1, PT_CAUSE(sp)
147 LONG_S $6, PT_R6(sp)
148 MFC0 v1, CP0_EPC
149 LONG_S $7, PT_R7(sp)
150#ifdef CONFIG_64BIT
151 LONG_S $8, PT_R8(sp)
152 LONG_S $9, PT_R9(sp)
153#endif
154 LONG_S v1, PT_EPC(sp)
155 LONG_S $25, PT_R25(sp)
156 LONG_S $28, PT_R28(sp)
157 LONG_S $31, PT_R31(sp)
158 ori $28, sp, _THREAD_MASK
159 xori $28, _THREAD_MASK
160 .set pop
161 .endm
162
163 .macro SAVE_ALL
164 SAVE_SOME
165 SAVE_AT
166 SAVE_TEMP
167 SAVE_STATIC
168 .endm
169
170 .macro RESTORE_AT
171 .set push
172 .set noat
173 LONG_L $1, PT_R1(sp)
174 .set pop
175 .endm
176
177 .macro RESTORE_TEMP
178 LONG_L $24, PT_LO(sp)
179#ifdef CONFIG_32BIT
180 LONG_L $8, PT_R8(sp)
181 LONG_L $9, PT_R9(sp)
182#endif
183 mtlo $24
184 LONG_L $24, PT_HI(sp)
185 LONG_L $10, PT_R10(sp)
186 LONG_L $11, PT_R11(sp)
187 mthi $24
188 LONG_L $12, PT_R12(sp)
189 LONG_L $13, PT_R13(sp)
190 LONG_L $14, PT_R14(sp)
191 LONG_L $15, PT_R15(sp)
192 LONG_L $24, PT_R24(sp)
193 .endm
194
195 .macro RESTORE_STATIC
196 LONG_L $16, PT_R16(sp)
197 LONG_L $17, PT_R17(sp)
198 LONG_L $18, PT_R18(sp)
199 LONG_L $19, PT_R19(sp)
200 LONG_L $20, PT_R20(sp)
201 LONG_L $21, PT_R21(sp)
202 LONG_L $22, PT_R22(sp)
203 LONG_L $23, PT_R23(sp)
204 LONG_L $30, PT_R30(sp)
205 .endm
206
207#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
208
209 .macro RESTORE_SOME
210 .set push
211 .set reorder
212 .set noat
213 mfc0 a0, CP0_STATUS
214 ori a0, 0x1f
215 xori a0, 0x1f
216 mtc0 a0, CP0_STATUS
217 li v1, 0xff00
218 and a0, v1
219 LONG_L v0, PT_STATUS(sp)
220 nor v1, $0, v1
221 and v0, v1
222 or v0, a0
223 mtc0 v0, CP0_STATUS
224 LONG_L $31, PT_R31(sp)
225 LONG_L $28, PT_R28(sp)
226 LONG_L $25, PT_R25(sp)
227#ifdef CONFIG_64BIT
228 LONG_L $8, PT_R8(sp)
229 LONG_L $9, PT_R9(sp)
230#endif
231 LONG_L $7, PT_R7(sp)
232 LONG_L $6, PT_R6(sp)
233 LONG_L $5, PT_R5(sp)
234 LONG_L $4, PT_R4(sp)
235 LONG_L $3, PT_R3(sp)
236 LONG_L $2, PT_R2(sp)
237 .set pop
238 .endm
239
240 .macro RESTORE_SP_AND_RET
241 .set push
242 .set noreorder
243 LONG_L k0, PT_EPC(sp)
244 LONG_L sp, PT_R29(sp)
245 jr k0
246 rfe
247 .set pop
248 .endm
249
250#else
251
252 .macro RESTORE_SOME
253 .set push
254 .set reorder
255 .set noat
256 mfc0 a0, CP0_STATUS
257 ori a0, 0x1f
258 xori a0, 0x1f
259 mtc0 a0, CP0_STATUS
260 li v1, 0xff00
261 and a0, v1
262 LONG_L v0, PT_STATUS(sp)
263 nor v1, $0, v1
264 and v0, v1
265 or v0, a0
266 mtc0 v0, CP0_STATUS
267 LONG_L v1, PT_EPC(sp)
268 MTC0 v1, CP0_EPC
269 LONG_L $31, PT_R31(sp)
270 LONG_L $28, PT_R28(sp)
271 LONG_L $25, PT_R25(sp)
272#ifdef CONFIG_64BIT
273 LONG_L $8, PT_R8(sp)
274 LONG_L $9, PT_R9(sp)
275#endif
276 LONG_L $7, PT_R7(sp)
277 LONG_L $6, PT_R6(sp)
278 LONG_L $5, PT_R5(sp)
279 LONG_L $4, PT_R4(sp)
280 LONG_L $3, PT_R3(sp)
281 LONG_L $2, PT_R2(sp)
282 .set pop
283 .endm
284
285 .macro RESTORE_SP_AND_RET
286 LONG_L sp, PT_R29(sp)
287 .set mips3
288 eret
289 .set mips0
290 .endm
291
292#endif
293
294 .macro RESTORE_SP
295 LONG_L sp, PT_R29(sp)
296 .endm
297
298 .macro RESTORE_ALL
299 RESTORE_TEMP
300 RESTORE_STATIC
301 RESTORE_AT
302 RESTORE_SOME
303 RESTORE_SP
304 .endm
305
306 .macro RESTORE_ALL_AND_RET
307 RESTORE_TEMP
308 RESTORE_STATIC
309 RESTORE_AT
310 RESTORE_SOME
311 RESTORE_SP_AND_RET
312 .endm
313
314/*
315 * Move to kernel mode and disable interrupts.
316 * Set cp0 enable bit as sign that we're running on the kernel stack
317 */
318 .macro CLI
319 mfc0 t0, CP0_STATUS
320 li t1, ST0_CU0 | 0x1f
321 or t0, t1
322 xori t0, 0x1f
323 mtc0 t0, CP0_STATUS
324 irq_disable_hazard
325 .endm
326
327/*
328 * Move to kernel mode and enable interrupts.
329 * Set cp0 enable bit as sign that we're running on the kernel stack
330 */
331 .macro STI
332 mfc0 t0, CP0_STATUS
333 li t1, ST0_CU0 | 0x1f
334 or t0, t1
335 xori t0, 0x1e
336 mtc0 t0, CP0_STATUS
337 irq_enable_hazard
338 .endm
339
340/*
341 * Just move to kernel mode and leave interrupts as they are.
342 * Set cp0 enable bit as sign that we're running on the kernel stack
343 */
344 .macro KMODE
345 mfc0 t0, CP0_STATUS
346 li t1, ST0_CU0 | 0x1e
347 or t0, t1
348 xori t0, 0x1e
349 mtc0 t0, CP0_STATUS
350 irq_disable_hazard
351 .endm
352
353#endif /* _ASM_STACKFRAME_H */