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>
10 #include <asm/addrspace.h>
12 #include <asm/asmmacro.h>
13 #include <asm/asm-offsets.h>
14 #include <asm/loongarch.h>
15 #include <asm/thread_info.h>
17 /* Make the addition of cfi info a little easier. */
18 .macro cfi_rel_offset reg offset=0 docfi=0
20 .cfi_rel_offset \reg, \offset
24 .macro cfi_st reg offset=0 docfi=0
25 cfi_rel_offset \reg, \offset, \docfi
26 LONG_S \reg, sp, \offset
29 .macro cfi_restore reg offset=0 docfi=0
35 .macro cfi_ld reg offset=0 docfi=0
36 LONG_L \reg, sp, \offset
37 cfi_restore \reg \offset \docfi
40 /* Jump to the runtime virtual address. */
41 .macro JUMP_VIRT_ADDR temp1 temp2
42 li.d \temp1, CACHE_BASE
44 or \temp1, \temp1, \temp2
45 jirl zero, \temp1, 0xc
49 csrwr t0, EXCEPTION_KS0
50 csrwr t1, EXCEPTION_KS1
54 csrrd t0, EXCEPTION_KS0
55 csrrd t1, EXCEPTION_KS1
58 .macro SAVE_TEMP docfi=0
60 cfi_st t0, PT_R12, \docfi
61 cfi_st t1, PT_R13, \docfi
62 cfi_st t2, PT_R14, \docfi
63 cfi_st t3, PT_R15, \docfi
64 cfi_st t4, PT_R16, \docfi
65 cfi_st t5, PT_R17, \docfi
66 cfi_st t6, PT_R18, \docfi
67 cfi_st t7, PT_R19, \docfi
68 cfi_st t8, PT_R20, \docfi
71 .macro SAVE_STATIC docfi=0
72 cfi_st s0, PT_R23, \docfi
73 cfi_st s1, PT_R24, \docfi
74 cfi_st s2, PT_R25, \docfi
75 cfi_st s3, PT_R26, \docfi
76 cfi_st s4, PT_R27, \docfi
77 cfi_st s5, PT_R28, \docfi
78 cfi_st s6, PT_R29, \docfi
79 cfi_st s7, PT_R30, \docfi
80 cfi_st s8, PT_R31, \docfi
84 * get_saved_sp returns the SP for the current CPU by looking in the
85 * kernelsp array for it. It stores the current sp in t0 and loads the
88 .macro get_saved_sp docfi=0
91 csrrd t0, PERCPU_BASE_KS
101 .macro set_saved_sp stackp temp temp2
102 la.pcrel \temp, kernelsp
104 LONG_ADD \temp, \temp, u0
106 LONG_S \stackp, \temp, 0
109 .macro SAVE_SOME docfi=0
110 csrrd t1, LOONGARCH_CSR_PRMD
111 andi t1, t1, 0x3 /* extract pplv bit */
114 /* Called from user mode, new stack. */
115 get_saved_sp docfi=\docfi
117 PTR_ADDI sp, sp, -PT_SIZE
121 cfi_st t0, PT_R3, \docfi
122 cfi_rel_offset sp, PT_R3, \docfi
123 LONG_S zero, sp, PT_R0
124 csrrd t0, LOONGARCH_CSR_PRMD
125 LONG_S t0, sp, PT_PRMD
126 csrrd t0, LOONGARCH_CSR_CRMD
127 LONG_S t0, sp, PT_CRMD
128 csrrd t0, LOONGARCH_CSR_EUEN
129 LONG_S t0, sp, PT_EUEN
130 csrrd t0, LOONGARCH_CSR_ECFG
131 LONG_S t0, sp, PT_ECFG
132 csrrd t0, LOONGARCH_CSR_ESTAT
133 PTR_S t0, sp, PT_ESTAT
134 cfi_st ra, PT_R1, \docfi
135 cfi_st a0, PT_R4, \docfi
136 cfi_st a1, PT_R5, \docfi
137 cfi_st a2, PT_R6, \docfi
138 cfi_st a3, PT_R7, \docfi
139 cfi_st a4, PT_R8, \docfi
140 cfi_st a5, PT_R9, \docfi
141 cfi_st a6, PT_R10, \docfi
142 cfi_st a7, PT_R11, \docfi
143 csrrd ra, LOONGARCH_CSR_ERA
144 LONG_S ra, sp, PT_ERA
146 .cfi_rel_offset ra, PT_ERA
148 cfi_st tp, PT_R2, \docfi
149 cfi_st fp, PT_R22, \docfi
151 /* Set thread_info if we're coming from user mode */
152 csrrd t0, LOONGARCH_CSR_PRMD
153 andi t0, t0, 0x3 /* extract pplv bit */
156 li.d tp, ~_THREAD_MASK
158 cfi_st u0, PT_R21, \docfi
159 csrrd u0, PERCPU_BASE_KS
163 csrxchg t0, t0, LOONGARCH_CSR_CRMD
167 .macro SAVE_ALL docfi=0
173 .macro RESTORE_TEMP docfi=0
174 cfi_ld t0, PT_R12, \docfi
175 cfi_ld t1, PT_R13, \docfi
176 cfi_ld t2, PT_R14, \docfi
177 cfi_ld t3, PT_R15, \docfi
178 cfi_ld t4, PT_R16, \docfi
179 cfi_ld t5, PT_R17, \docfi
180 cfi_ld t6, PT_R18, \docfi
181 cfi_ld t7, PT_R19, \docfi
182 cfi_ld t8, PT_R20, \docfi
185 .macro RESTORE_STATIC docfi=0
186 cfi_ld s0, PT_R23, \docfi
187 cfi_ld s1, PT_R24, \docfi
188 cfi_ld s2, PT_R25, \docfi
189 cfi_ld s3, PT_R26, \docfi
190 cfi_ld s4, PT_R27, \docfi
191 cfi_ld s5, PT_R28, \docfi
192 cfi_ld s6, PT_R29, \docfi
193 cfi_ld s7, PT_R30, \docfi
194 cfi_ld s8, PT_R31, \docfi
197 .macro RESTORE_SOME docfi=0
198 LONG_L a0, sp, PT_PRMD
199 andi a0, a0, 0x3 /* extract pplv bit */
201 cfi_ld u0, PT_R21, \docfi
203 LONG_L a0, sp, PT_ERA
204 csrwr a0, LOONGARCH_CSR_ERA
205 LONG_L a0, sp, PT_PRMD
206 csrwr a0, LOONGARCH_CSR_PRMD
207 cfi_ld ra, PT_R1, \docfi
208 cfi_ld a0, PT_R4, \docfi
209 cfi_ld a1, PT_R5, \docfi
210 cfi_ld a2, PT_R6, \docfi
211 cfi_ld a3, PT_R7, \docfi
212 cfi_ld a4, PT_R8, \docfi
213 cfi_ld a5, PT_R9, \docfi
214 cfi_ld a6, PT_R10, \docfi
215 cfi_ld a7, PT_R11, \docfi
216 cfi_ld tp, PT_R2, \docfi
217 cfi_ld fp, PT_R22, \docfi
220 .macro RESTORE_SP_AND_RET docfi=0
221 cfi_ld sp, PT_R3, \docfi
225 .macro RESTORE_ALL_AND_RET docfi=0
226 RESTORE_STATIC \docfi
229 RESTORE_SP_AND_RET \docfi
232 #endif /* _ASM_STACKFRAME_H */