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 #include <asm/unwind_hints.h> 17 18 /* Make the addition of cfi info a little easier. */ 19 .macro cfi_rel_offset reg offset=0 docfi=0 20 .if \docfi 21 .cfi_rel_offset \reg, \offset 22 .endif 23 .endm 24 25 .macro cfi_st reg offset=0 docfi=0 26 cfi_rel_offset \reg, \offset, \docfi 27 LONG_S \reg, sp, \offset 28 .endm 29 30 .macro cfi_restore reg offset=0 docfi=0 31 .if \docfi 32 .cfi_restore \reg 33 .endif 34 .endm 35 36 .macro cfi_ld reg offset=0 docfi=0 37 LONG_L \reg, sp, \offset 38 cfi_restore \reg \offset \docfi 39 .endm 40 41 /* Jump to the runtime virtual address. */ 42 .macro JUMP_VIRT_ADDR temp1 temp2 43 li.d \temp1, CACHE_BASE 44 pcaddi \temp2, 0 45 or \temp1, \temp1, \temp2 46 jirl zero, \temp1, 0xc 47 .endm 48 49 .macro BACKUP_T0T1 50 csrwr t0, EXCEPTION_KS0 51 csrwr t1, EXCEPTION_KS1 52 .endm 53 54 .macro RELOAD_T0T1 55 csrrd t0, EXCEPTION_KS0 56 csrrd t1, EXCEPTION_KS1 57 .endm 58 59 .macro SAVE_TEMP docfi=0 60 RELOAD_T0T1 61 cfi_st t0, PT_R12, \docfi 62 cfi_st t1, PT_R13, \docfi 63 cfi_st t2, PT_R14, \docfi 64 cfi_st t3, PT_R15, \docfi 65 cfi_st t4, PT_R16, \docfi 66 cfi_st t5, PT_R17, \docfi 67 cfi_st t6, PT_R18, \docfi 68 cfi_st t7, PT_R19, \docfi 69 cfi_st t8, PT_R20, \docfi 70 .endm 71 72 .macro SAVE_STATIC docfi=0 73 cfi_st s0, PT_R23, \docfi 74 cfi_st s1, PT_R24, \docfi 75 cfi_st s2, PT_R25, \docfi 76 cfi_st s3, PT_R26, \docfi 77 cfi_st s4, PT_R27, \docfi 78 cfi_st s5, PT_R28, \docfi 79 cfi_st s6, PT_R29, \docfi 80 cfi_st s7, PT_R30, \docfi 81 cfi_st s8, PT_R31, \docfi 82 .endm 83 84 /* 85 * get_saved_sp returns the SP for the current CPU by looking in the 86 * kernelsp array for it. It stores the current sp in t0 and loads the 87 * new value in sp. 88 */ 89 .macro get_saved_sp docfi=0 90 la_abs t1, kernelsp 91 #ifdef CONFIG_SMP 92 csrrd t0, PERCPU_BASE_KS 93 LONG_ADD t1, t1, t0 94 #endif 95 move t0, sp 96 .if \docfi 97 .cfi_register sp, t0 98 .endif 99 LONG_L sp, t1, 0 100 .endm 101 102 .macro set_saved_sp stackp temp temp2 103 la.pcrel \temp, kernelsp 104 #ifdef CONFIG_SMP 105 LONG_ADD \temp, \temp, u0 106 #endif 107 LONG_S \stackp, \temp, 0 108 .endm 109 110 .macro SAVE_SOME docfi=0 111 csrrd t1, LOONGARCH_CSR_PRMD 112 andi t1, t1, 0x3 /* extract pplv bit */ 113 move t0, sp 114 beqz t1, 8f 115 /* Called from user mode, new stack. */ 116 get_saved_sp docfi=\docfi 117 8: 118 PTR_ADDI sp, sp, -PT_SIZE 119 .if \docfi 120 .cfi_def_cfa sp, 0 121 .endif 122 cfi_st t0, PT_R3, \docfi 123 cfi_rel_offset sp, PT_R3, \docfi 124 LONG_S zero, sp, PT_R0 125 csrrd t0, LOONGARCH_CSR_PRMD 126 LONG_S t0, sp, PT_PRMD 127 csrrd t0, LOONGARCH_CSR_CRMD 128 LONG_S t0, sp, PT_CRMD 129 csrrd t0, LOONGARCH_CSR_EUEN 130 LONG_S t0, sp, PT_EUEN 131 csrrd t0, LOONGARCH_CSR_ECFG 132 LONG_S t0, sp, PT_ECFG 133 csrrd t0, LOONGARCH_CSR_ESTAT 134 PTR_S t0, sp, PT_ESTAT 135 cfi_st ra, PT_R1, \docfi 136 cfi_st a0, PT_R4, \docfi 137 cfi_st a1, PT_R5, \docfi 138 cfi_st a2, PT_R6, \docfi 139 cfi_st a3, PT_R7, \docfi 140 cfi_st a4, PT_R8, \docfi 141 cfi_st a5, PT_R9, \docfi 142 cfi_st a6, PT_R10, \docfi 143 cfi_st a7, PT_R11, \docfi 144 csrrd ra, LOONGARCH_CSR_ERA 145 LONG_S ra, sp, PT_ERA 146 .if \docfi 147 .cfi_rel_offset ra, PT_ERA 148 .endif 149 cfi_st tp, PT_R2, \docfi 150 cfi_st fp, PT_R22, \docfi 151 152 /* Set thread_info if we're coming from user mode */ 153 csrrd t0, LOONGARCH_CSR_PRMD 154 andi t0, t0, 0x3 /* extract pplv bit */ 155 beqz t0, 9f 156 157 li.d tp, ~_THREAD_MASK 158 and tp, tp, sp 159 cfi_st u0, PT_R21, \docfi 160 csrrd u0, PERCPU_BASE_KS 161 9: 162 #ifdef CONFIG_KGDB 163 li.w t0, CSR_CRMD_WE 164 csrxchg t0, t0, LOONGARCH_CSR_CRMD 165 #endif 166 UNWIND_HINT_REGS 167 .endm 168 169 .macro SAVE_ALL docfi=0 170 SAVE_SOME \docfi 171 SAVE_TEMP \docfi 172 SAVE_STATIC \docfi 173 .endm 174 175 .macro RESTORE_TEMP docfi=0 176 cfi_ld t0, PT_R12, \docfi 177 cfi_ld t1, PT_R13, \docfi 178 cfi_ld t2, PT_R14, \docfi 179 cfi_ld t3, PT_R15, \docfi 180 cfi_ld t4, PT_R16, \docfi 181 cfi_ld t5, PT_R17, \docfi 182 cfi_ld t6, PT_R18, \docfi 183 cfi_ld t7, PT_R19, \docfi 184 cfi_ld t8, PT_R20, \docfi 185 .endm 186 187 .macro RESTORE_STATIC docfi=0 188 cfi_ld s0, PT_R23, \docfi 189 cfi_ld s1, PT_R24, \docfi 190 cfi_ld s2, PT_R25, \docfi 191 cfi_ld s3, PT_R26, \docfi 192 cfi_ld s4, PT_R27, \docfi 193 cfi_ld s5, PT_R28, \docfi 194 cfi_ld s6, PT_R29, \docfi 195 cfi_ld s7, PT_R30, \docfi 196 cfi_ld s8, PT_R31, \docfi 197 .endm 198 199 .macro RESTORE_SOME docfi=0 200 LONG_L a0, sp, PT_PRMD 201 andi a0, a0, 0x3 /* extract pplv bit */ 202 beqz a0, 8f 203 cfi_ld u0, PT_R21, \docfi 204 8: 205 LONG_L a0, sp, PT_ERA 206 csrwr a0, LOONGARCH_CSR_ERA 207 LONG_L a0, sp, PT_PRMD 208 csrwr a0, LOONGARCH_CSR_PRMD 209 cfi_ld ra, PT_R1, \docfi 210 cfi_ld a0, PT_R4, \docfi 211 cfi_ld a1, PT_R5, \docfi 212 cfi_ld a2, PT_R6, \docfi 213 cfi_ld a3, PT_R7, \docfi 214 cfi_ld a4, PT_R8, \docfi 215 cfi_ld a5, PT_R9, \docfi 216 cfi_ld a6, PT_R10, \docfi 217 cfi_ld a7, PT_R11, \docfi 218 cfi_ld tp, PT_R2, \docfi 219 cfi_ld fp, PT_R22, \docfi 220 .endm 221 222 .macro RESTORE_SP_AND_RET docfi=0 223 cfi_ld sp, PT_R3, \docfi 224 UNWIND_HINT_FUNC 225 ertn 226 .endm 227 228 .macro RESTORE_ALL_AND_RET docfi=0 229 RESTORE_STATIC \docfi 230 RESTORE_TEMP \docfi 231 RESTORE_SOME \docfi 232 RESTORE_SP_AND_RET \docfi 233 .endm 234 235 #endif /* _ASM_STACKFRAME_H */ 236