1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#ifndef _ASM_STACKFRAME_H
#define _ASM_STACKFRAME_H
#include <linux/threads.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/asm-offsets.h>
#include <asm/loongarch.h>
#include <asm/thread_info.h>
/* Make the addition of cfi info a little easier. */
.macro cfi_rel_offset reg offset=0 docfi=0
.if \docfi
.cfi_rel_offset \reg, \offset
.endif
.endm
.macro cfi_st reg offset=0 docfi=0
cfi_rel_offset \reg, \offset, \docfi
LONG_S \reg, sp, \offset
.endm
.macro cfi_restore reg offset=0 docfi=0
.if \docfi
.cfi_restore \reg
.endif
.endm
.macro cfi_ld reg offset=0 docfi=0
LONG_L \reg, sp, \offset
cfi_restore \reg \offset \docfi
.endm
.macro BACKUP_T0T1
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
.endm
.macro RELOAD_T0T1
csrrd t0, EXCEPTION_KS0
csrrd t1, EXCEPTION_KS1
.endm
.macro SAVE_TEMP docfi=0
RELOAD_T0T1
cfi_st t0, PT_R12, \docfi
cfi_st t1, PT_R13, \docfi
cfi_st t2, PT_R14, \docfi
cfi_st t3, PT_R15, \docfi
cfi_st t4, PT_R16, \docfi
cfi_st t5, PT_R17, \docfi
cfi_st t6, PT_R18, \docfi
cfi_st t7, PT_R19, \docfi
cfi_st t8, PT_R20, \docfi
.endm
.macro SAVE_STATIC docfi=0
cfi_st s0, PT_R23, \docfi
cfi_st s1, PT_R24, \docfi
cfi_st s2, PT_R25, \docfi
cfi_st s3, PT_R26, \docfi
cfi_st s4, PT_R27, \docfi
cfi_st s5, PT_R28, \docfi
cfi_st s6, PT_R29, \docfi
cfi_st s7, PT_R30, \docfi
cfi_st s8, PT_R31, \docfi
.endm
/*
* get_saved_sp returns the SP for the current CPU by looking in the
* kernelsp array for it. It stores the current sp in t0 and loads the
* new value in sp.
*/
.macro get_saved_sp docfi=0
la.abs t1, kernelsp
#ifdef CONFIG_SMP
csrrd t0, PERCPU_BASE_KS
LONG_ADD t1, t1, t0
#endif
move t0, sp
.if \docfi
.cfi_register sp, t0
.endif
LONG_L sp, t1, 0
.endm
.macro set_saved_sp stackp temp temp2
la.abs \temp, kernelsp
#ifdef CONFIG_SMP
LONG_ADD \temp, \temp, u0
#endif
LONG_S \stackp, \temp, 0
.endm
.macro SAVE_SOME docfi=0
csrrd t1, LOONGARCH_CSR_PRMD
andi t1, t1, 0x3 /* extract pplv bit */
move t0, sp
beqz t1, 8f
/* Called from user mode, new stack. */
get_saved_sp docfi=\docfi
8:
PTR_ADDI sp, sp, -PT_SIZE
.if \docfi
.cfi_def_cfa sp, 0
.endif
cfi_st t0, PT_R3, \docfi
cfi_rel_offset sp, PT_R3, \docfi
LONG_S zero, sp, PT_R0
csrrd t0, LOONGARCH_CSR_PRMD
LONG_S t0, sp, PT_PRMD
csrrd t0, LOONGARCH_CSR_CRMD
LONG_S t0, sp, PT_CRMD
csrrd t0, LOONGARCH_CSR_EUEN
LONG_S t0, sp, PT_EUEN
csrrd t0, LOONGARCH_CSR_ECFG
LONG_S t0, sp, PT_ECFG
csrrd t0, LOONGARCH_CSR_ESTAT
PTR_S t0, sp, PT_ESTAT
cfi_st ra, PT_R1, \docfi
cfi_st a0, PT_R4, \docfi
cfi_st a1, PT_R5, \docfi
cfi_st a2, PT_R6, \docfi
cfi_st a3, PT_R7, \docfi
cfi_st a4, PT_R8, \docfi
cfi_st a5, PT_R9, \docfi
cfi_st a6, PT_R10, \docfi
cfi_st a7, PT_R11, \docfi
csrrd ra, LOONGARCH_CSR_ERA
LONG_S ra, sp, PT_ERA
.if \docfi
.cfi_rel_offset ra, PT_ERA
.endif
cfi_st tp, PT_R2, \docfi
cfi_st fp, PT_R22, \docfi
/* Set thread_info if we're coming from user mode */
csrrd t0, LOONGARCH_CSR_PRMD
andi t0, t0, 0x3 /* extract pplv bit */
beqz t0, 9f
li.d tp, ~_THREAD_MASK
and tp, tp, sp
cfi_st u0, PT_R21, \docfi
csrrd u0, PERCPU_BASE_KS
9:
.endm
.macro SAVE_ALL docfi=0
SAVE_SOME \docfi
SAVE_TEMP \docfi
SAVE_STATIC \docfi
.endm
.macro RESTORE_TEMP docfi=0
cfi_ld t0, PT_R12, \docfi
cfi_ld t1, PT_R13, \docfi
cfi_ld t2, PT_R14, \docfi
cfi_ld t3, PT_R15, \docfi
cfi_ld t4, PT_R16, \docfi
cfi_ld t5, PT_R17, \docfi
cfi_ld t6, PT_R18, \docfi
cfi_ld t7, PT_R19, \docfi
cfi_ld t8, PT_R20, \docfi
.endm
.macro RESTORE_STATIC docfi=0
cfi_ld s0, PT_R23, \docfi
cfi_ld s1, PT_R24, \docfi
cfi_ld s2, PT_R25, \docfi
cfi_ld s3, PT_R26, \docfi
cfi_ld s4, PT_R27, \docfi
cfi_ld s5, PT_R28, \docfi
cfi_ld s6, PT_R29, \docfi
cfi_ld s7, PT_R30, \docfi
cfi_ld s8, PT_R31, \docfi
.endm
.macro RESTORE_SOME docfi=0
LONG_L a0, sp, PT_PRMD
andi a0, a0, 0x3 /* extract pplv bit */
beqz a0, 8f
cfi_ld u0, PT_R21, \docfi
8:
LONG_L a0, sp, PT_ERA
csrwr a0, LOONGARCH_CSR_ERA
LONG_L a0, sp, PT_PRMD
csrwr a0, LOONGARCH_CSR_PRMD
cfi_ld ra, PT_R1, \docfi
cfi_ld a0, PT_R4, \docfi
cfi_ld a1, PT_R5, \docfi
cfi_ld a2, PT_R6, \docfi
cfi_ld a3, PT_R7, \docfi
cfi_ld a4, PT_R8, \docfi
cfi_ld a5, PT_R9, \docfi
cfi_ld a6, PT_R10, \docfi
cfi_ld a7, PT_R11, \docfi
cfi_ld tp, PT_R2, \docfi
cfi_ld fp, PT_R22, \docfi
.endm
.macro RESTORE_SP_AND_RET docfi=0
cfi_ld sp, PT_R3, \docfi
ertn
.endm
.macro RESTORE_ALL_AND_RET docfi=0
RESTORE_STATIC \docfi
RESTORE_TEMP \docfi
RESTORE_SOME \docfi
RESTORE_SP_AND_RET \docfi
.endm
#endif /* _ASM_STACKFRAME_H */
|
