1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #ifndef _ASM_STACKFRAME_H 6 #define _ASM_STACKFRAME_H 7 8 #include <linux/threads.h> 9 10 #include <asm/addrspace.h> 11 #include <asm/asm.h> 12 #include <asm/asmmacro.h> 13 #include <asm/asm-offsets.h> 14 #include <asm/loongarch.h> 15 #include <asm/thread_info.h> 16 17 /* Make the addition of cfi info a little easier. */ 18 .macro cfi_rel_offset reg offset=0 docfi=0 19 .if \docfi 20 .cfi_rel_offset \reg, \offset 21 .endif 22 .endm 23 24 .macro cfi_st reg offset=0 docfi=0 25 cfi_rel_offset \reg, \offset, \docfi 26 LONG_S \reg, sp, \offset 27 .endm 28 29 .macro cfi_restore reg offset=0 docfi=0 30 .if \docfi 31 .cfi_restore \reg 32 .endif 33 .endm 34 35 .macro cfi_ld reg offset=0 docfi=0 36 LONG_L \reg, sp, \offset 37 cfi_restore \reg \offset \docfi 38 .endm 39 40 /* Jump to the runtime virtual address. */ 41 .macro JUMP_VIRT_ADDR temp1 temp2 42 li.d \temp1, CACHE_BASE 43 pcaddi \temp2, 0 44 or \temp1, \temp1, \temp2 45 jirl zero, \temp1, 0xc 46 .endm 47 48 .macro BACKUP_T0T1 49 csrwr t0, EXCEPTION_KS0 50 csrwr t1, EXCEPTION_KS1 51 .endm 52 53 .macro RELOAD_T0T1 54 csrrd t0, EXCEPTION_KS0 55 csrrd t1, EXCEPTION_KS1 56 .endm 57 58 .macro SAVE_TEMP docfi=0 59 RELOAD_T0T1 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 69 .endm 70 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 81 .endm 82 83 /* 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 86 * new value in sp. 87 */ 88 .macro get_saved_sp docfi=0 89 la_abs t1, kernelsp 90 #ifdef CONFIG_SMP 91 csrrd t0, PERCPU_BASE_KS 92 LONG_ADD t1, t1, t0 93 #endif 94 move t0, sp 95 .if \docfi 96 .cfi_register sp, t0 97 .endif 98 LONG_L sp, t1, 0 99 .endm 100 101 .macro set_saved_sp stackp temp temp2 102 la.pcrel \temp, kernelsp 103 #ifdef CONFIG_SMP 104 LONG_ADD \temp, \temp, u0 105 #endif 106 LONG_S \stackp, \temp, 0 107 .endm 108 109 .macro SAVE_SOME docfi=0 110 csrrd t1, LOONGARCH_CSR_PRMD 111 andi t1, t1, 0x3 /* extract pplv bit */ 112 move t0, sp 113 beqz t1, 8f 114 /* Called from user mode, new stack. */ 115 get_saved_sp docfi=\docfi 116 8: 117 PTR_ADDI sp, sp, -PT_SIZE 118 .if \docfi 119 .cfi_def_cfa sp, 0 120 .endif 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 145 .if \docfi 146 .cfi_rel_offset ra, PT_ERA 147 .endif 148 cfi_st tp, PT_R2, \docfi 149 cfi_st fp, PT_R22, \docfi 150 151 /* Set thread_info if we're coming from user mode */ 152 csrrd t0, LOONGARCH_CSR_PRMD 153 andi t0, t0, 0x3 /* extract pplv bit */ 154 beqz t0, 9f 155 156 li.d tp, ~_THREAD_MASK 157 and tp, tp, sp 158 cfi_st u0, PT_R21, \docfi 159 csrrd u0, PERCPU_BASE_KS 160 9: 161 #ifdef CONFIG_KGDB 162 li.w t0, CSR_CRMD_WE 163 csrxchg t0, t0, LOONGARCH_CSR_CRMD 164 #endif 165 .endm 166 167 .macro SAVE_ALL docfi=0 168 SAVE_SOME \docfi 169 SAVE_TEMP \docfi 170 SAVE_STATIC \docfi 171 .endm 172 173 .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 183 .endm 184 185 .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 195 .endm 196 197 .macro RESTORE_SOME docfi=0 198 LONG_L a0, sp, PT_PRMD 199 andi a0, a0, 0x3 /* extract pplv bit */ 200 beqz a0, 8f 201 cfi_ld u0, PT_R21, \docfi 202 8: 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 218 .endm 219 220 .macro RESTORE_SP_AND_RET docfi=0 221 cfi_ld sp, PT_R3, \docfi 222 ertn 223 .endm 224 225 .macro RESTORE_ALL_AND_RET docfi=0 226 RESTORE_STATIC \docfi 227 RESTORE_TEMP \docfi 228 RESTORE_SOME \docfi 229 RESTORE_SP_AND_RET \docfi 230 .endm 231 232 #endif /* _ASM_STACKFRAME_H */ 233