1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
5 #ifndef _ASM_STACKFRAME_H
6 #define _ASM_STACKFRAME_H
8 #include <linux/threads.h>
11 #include <asm/asmmacro.h>
12 #include <asm/asm-offsets.h>
13 #include <asm/loongarch.h>
14 #include <asm/thread_info.h>
16 /* Make the addition of cfi info a little easier. */
17 .macro cfi_rel_offset reg offset=0 docfi=0
19 .cfi_rel_offset \reg, \offset
23 .macro cfi_st reg offset=0 docfi=0
24 cfi_rel_offset \reg, \offset, \docfi
25 LONG_S \reg, sp, \offset
28 .macro cfi_restore reg offset=0 docfi=0
34 .macro cfi_ld reg offset=0 docfi=0
35 LONG_L \reg, sp, \offset
36 cfi_restore \reg \offset \docfi
40 csrwr t0, EXCEPTION_KS0
41 csrwr t1, EXCEPTION_KS1
45 csrrd t0, EXCEPTION_KS0
46 csrrd t1, EXCEPTION_KS1
49 .macro SAVE_TEMP docfi=0
51 cfi_st t0, PT_R12, \docfi
52 cfi_st t1, PT_R13, \docfi
53 cfi_st t2, PT_R14, \docfi
54 cfi_st t3, PT_R15, \docfi
55 cfi_st t4, PT_R16, \docfi
56 cfi_st t5, PT_R17, \docfi
57 cfi_st t6, PT_R18, \docfi
58 cfi_st t7, PT_R19, \docfi
59 cfi_st t8, PT_R20, \docfi
62 .macro SAVE_STATIC docfi=0
63 cfi_st s0, PT_R23, \docfi
64 cfi_st s1, PT_R24, \docfi
65 cfi_st s2, PT_R25, \docfi
66 cfi_st s3, PT_R26, \docfi
67 cfi_st s4, PT_R27, \docfi
68 cfi_st s5, PT_R28, \docfi
69 cfi_st s6, PT_R29, \docfi
70 cfi_st s7, PT_R30, \docfi
71 cfi_st s8, PT_R31, \docfi
75 * get_saved_sp returns the SP for the current CPU by looking in the
76 * kernelsp array for it. It stores the current sp in t0 and loads the
79 .macro get_saved_sp docfi=0
82 csrrd t0, PERCPU_BASE_KS
92 .macro set_saved_sp stackp temp temp2
93 la.abs \temp, kernelsp
95 LONG_ADD \temp, \temp, u0
97 LONG_S \stackp, \temp, 0
100 .macro SAVE_SOME docfi=0
101 csrrd t1, LOONGARCH_CSR_PRMD
102 andi t1, t1, 0x3 /* extract pplv bit */
105 /* Called from user mode, new stack. */
106 get_saved_sp docfi=\docfi
108 PTR_ADDI sp, sp, -PT_SIZE
112 cfi_st t0, PT_R3, \docfi
113 cfi_rel_offset sp, PT_R3, \docfi
114 LONG_S zero, sp, PT_R0
115 csrrd t0, LOONGARCH_CSR_PRMD
116 LONG_S t0, sp, PT_PRMD
117 csrrd t0, LOONGARCH_CSR_CRMD
118 LONG_S t0, sp, PT_CRMD
119 csrrd t0, LOONGARCH_CSR_EUEN
120 LONG_S t0, sp, PT_EUEN
121 csrrd t0, LOONGARCH_CSR_ECFG
122 LONG_S t0, sp, PT_ECFG
123 csrrd t0, LOONGARCH_CSR_ESTAT
124 PTR_S t0, sp, PT_ESTAT
125 cfi_st ra, PT_R1, \docfi
126 cfi_st a0, PT_R4, \docfi
127 cfi_st a1, PT_R5, \docfi
128 cfi_st a2, PT_R6, \docfi
129 cfi_st a3, PT_R7, \docfi
130 cfi_st a4, PT_R8, \docfi
131 cfi_st a5, PT_R9, \docfi
132 cfi_st a6, PT_R10, \docfi
133 cfi_st a7, PT_R11, \docfi
134 csrrd ra, LOONGARCH_CSR_ERA
135 LONG_S ra, sp, PT_ERA
137 .cfi_rel_offset ra, PT_ERA
139 cfi_st tp, PT_R2, \docfi
140 cfi_st fp, PT_R22, \docfi
142 /* Set thread_info if we're coming from user mode */
143 csrrd t0, LOONGARCH_CSR_PRMD
144 andi t0, t0, 0x3 /* extract pplv bit */
147 li.d tp, ~_THREAD_MASK
149 cfi_st u0, PT_R21, \docfi
150 csrrd u0, PERCPU_BASE_KS
154 .macro SAVE_ALL docfi=0
160 .macro RESTORE_TEMP docfi=0
161 cfi_ld t0, PT_R12, \docfi
162 cfi_ld t1, PT_R13, \docfi
163 cfi_ld t2, PT_R14, \docfi
164 cfi_ld t3, PT_R15, \docfi
165 cfi_ld t4, PT_R16, \docfi
166 cfi_ld t5, PT_R17, \docfi
167 cfi_ld t6, PT_R18, \docfi
168 cfi_ld t7, PT_R19, \docfi
169 cfi_ld t8, PT_R20, \docfi
172 .macro RESTORE_STATIC docfi=0
173 cfi_ld s0, PT_R23, \docfi
174 cfi_ld s1, PT_R24, \docfi
175 cfi_ld s2, PT_R25, \docfi
176 cfi_ld s3, PT_R26, \docfi
177 cfi_ld s4, PT_R27, \docfi
178 cfi_ld s5, PT_R28, \docfi
179 cfi_ld s6, PT_R29, \docfi
180 cfi_ld s7, PT_R30, \docfi
181 cfi_ld s8, PT_R31, \docfi
184 .macro RESTORE_SOME docfi=0
185 LONG_L a0, sp, PT_PRMD
186 andi a0, a0, 0x3 /* extract pplv bit */
188 cfi_ld u0, PT_R21, \docfi
190 LONG_L a0, sp, PT_ERA
191 csrwr a0, LOONGARCH_CSR_ERA
192 LONG_L a0, sp, PT_PRMD
193 csrwr a0, LOONGARCH_CSR_PRMD
194 cfi_ld ra, PT_R1, \docfi
195 cfi_ld a0, PT_R4, \docfi
196 cfi_ld a1, PT_R5, \docfi
197 cfi_ld a2, PT_R6, \docfi
198 cfi_ld a3, PT_R7, \docfi
199 cfi_ld a4, PT_R8, \docfi
200 cfi_ld a5, PT_R9, \docfi
201 cfi_ld a6, PT_R10, \docfi
202 cfi_ld a7, PT_R11, \docfi
203 cfi_ld tp, PT_R2, \docfi
204 cfi_ld fp, PT_R22, \docfi
207 .macro RESTORE_SP_AND_RET docfi=0
208 cfi_ld sp, PT_R3, \docfi
212 .macro RESTORE_ALL_AND_RET docfi=0
213 RESTORE_STATIC \docfi
216 RESTORE_SP_AND_RET \docfi
219 #endif /* _ASM_STACKFRAME_H */