1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle 4 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 5 * Copyright (C) 2002, 2007 Maciej W. Rozycki 6 * Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved. 7 */ 8 9 #include <asm/asm.h> 10 #include <asm/regdef.h> 11 #include <asm/mipsregs.h> 12 #include <asm/asm-offsets.h> 13 14 #define STATMASK 0x1f 15 16 .set noreorder 17 18 /* 19 * Macros copied and adapted from Linux MIPS 20 */ 21 .macro SAVE_AT 22 .set push 23 .set noat 24 LONG_S $1, PT_R1(sp) 25 .set pop 26 .endm 27 28 .macro SAVE_TEMP 29 #if __mips_isa_rev < 6 30 mfhi v1 31 #endif 32 #ifdef CONFIG_32BIT 33 LONG_S $8, PT_R8(sp) 34 LONG_S $9, PT_R9(sp) 35 #endif 36 LONG_S $10, PT_R10(sp) 37 LONG_S $11, PT_R11(sp) 38 LONG_S $12, PT_R12(sp) 39 #if __mips_isa_rev < 6 40 LONG_S v1, PT_HI(sp) 41 mflo v1 42 #endif 43 LONG_S $13, PT_R13(sp) 44 LONG_S $14, PT_R14(sp) 45 LONG_S $15, PT_R15(sp) 46 LONG_S $24, PT_R24(sp) 47 #if __mips_isa_rev < 6 48 LONG_S v1, PT_LO(sp) 49 #endif 50 .endm 51 52 .macro SAVE_STATIC 53 LONG_S $16, PT_R16(sp) 54 LONG_S $17, PT_R17(sp) 55 LONG_S $18, PT_R18(sp) 56 LONG_S $19, PT_R19(sp) 57 LONG_S $20, PT_R20(sp) 58 LONG_S $21, PT_R21(sp) 59 LONG_S $22, PT_R22(sp) 60 LONG_S $23, PT_R23(sp) 61 LONG_S $30, PT_R30(sp) 62 .endm 63 64 .macro SAVE_SOME 65 .set push 66 .set noat 67 PTR_SUBU k1, sp, PT_SIZE 68 LONG_S sp, PT_R29(k1) 69 move sp, k1 70 71 LONG_S $3, PT_R3(sp) 72 LONG_S $0, PT_R0(sp) 73 mfc0 v1, CP0_STATUS 74 LONG_S $2, PT_R2(sp) 75 LONG_S v1, PT_STATUS(sp) 76 LONG_S $4, PT_R4(sp) 77 mfc0 v1, CP0_CAUSE 78 LONG_S $5, PT_R5(sp) 79 LONG_S v1, PT_CAUSE(sp) 80 LONG_S $6, PT_R6(sp) 81 MFC0 v1, CP0_EPC 82 LONG_S $7, PT_R7(sp) 83 #ifdef CONFIG_64BIT 84 LONG_S $8, PT_R8(sp) 85 LONG_S $9, PT_R9(sp) 86 #endif 87 LONG_S v1, PT_EPC(sp) 88 LONG_S $25, PT_R25(sp) 89 LONG_S $28, PT_R28(sp) 90 LONG_S $31, PT_R31(sp) 91 .set pop 92 .endm 93 94 .macro RESTORE_AT 95 .set push 96 .set noat 97 LONG_L $1, PT_R1(sp) 98 .set pop 99 .endm 100 101 .macro RESTORE_TEMP 102 #if __mips_isa_rev < 6 103 LONG_L $24, PT_LO(sp) 104 mtlo $24 105 LONG_L $24, PT_HI(sp) 106 mthi $24 107 #endif 108 #ifdef CONFIG_32BIT 109 LONG_L $8, PT_R8(sp) 110 LONG_L $9, PT_R9(sp) 111 #endif 112 LONG_L $10, PT_R10(sp) 113 LONG_L $11, PT_R11(sp) 114 LONG_L $12, PT_R12(sp) 115 LONG_L $13, PT_R13(sp) 116 LONG_L $14, PT_R14(sp) 117 LONG_L $15, PT_R15(sp) 118 LONG_L $24, PT_R24(sp) 119 .endm 120 121 .macro RESTORE_STATIC 122 LONG_L $16, PT_R16(sp) 123 LONG_L $17, PT_R17(sp) 124 LONG_L $18, PT_R18(sp) 125 LONG_L $19, PT_R19(sp) 126 LONG_L $20, PT_R20(sp) 127 LONG_L $21, PT_R21(sp) 128 LONG_L $22, PT_R22(sp) 129 LONG_L $23, PT_R23(sp) 130 LONG_L $30, PT_R30(sp) 131 .endm 132 133 .macro RESTORE_SOME 134 .set push 135 .set reorder 136 .set noat 137 mfc0 a0, CP0_STATUS 138 ori a0, STATMASK 139 xori a0, STATMASK 140 mtc0 a0, CP0_STATUS 141 li v1, ST0_CU1 | ST0_FR | ST0_IM 142 and a0, v1 143 LONG_L v0, PT_STATUS(sp) 144 nor v1, $0, v1 145 and v0, v1 146 or v0, a0 147 mtc0 v0, CP0_STATUS 148 LONG_L v1, PT_EPC(sp) 149 MTC0 v1, CP0_EPC 150 LONG_L $31, PT_R31(sp) 151 LONG_L $28, PT_R28(sp) 152 LONG_L $25, PT_R25(sp) 153 #ifdef CONFIG_64BIT 154 LONG_L $8, PT_R8(sp) 155 LONG_L $9, PT_R9(sp) 156 #endif 157 LONG_L $7, PT_R7(sp) 158 LONG_L $6, PT_R6(sp) 159 LONG_L $5, PT_R5(sp) 160 LONG_L $4, PT_R4(sp) 161 LONG_L $3, PT_R3(sp) 162 LONG_L $2, PT_R2(sp) 163 .set pop 164 .endm 165 166 .macro RESTORE_SP 167 LONG_L sp, PT_R29(sp) 168 .endm 169 170 NESTED(except_vec3_generic, 0, sp) 171 PTR_LA k1, handle_reserved 172 jr k1 173 nop 174 END(except_vec3_generic) 175 176 NESTED(except_vec_ejtag_debug, 0, sp) 177 PTR_LA k1, handle_ejtag_debug 178 jr k1 179 nop 180 END(except_vec_ejtag_debug) 181 182 NESTED(handle_reserved, PT_SIZE, sp) 183 SAVE_SOME 184 SAVE_AT 185 SAVE_TEMP 186 SAVE_STATIC 187 188 PTR_LA t9, do_reserved 189 jr t9 190 move a0, sp 191 END(handle_reserved) 192 193 NESTED(handle_ejtag_debug, PT_SIZE, sp) 194 .set push 195 .set noat 196 MTC0 k1, CP0_DESAVE 197 198 /* Check for SDBBP */ 199 MFC0 k1, CP0_DEBUG 200 sll k1, k1, 30 201 bgez k1, ejtag_return 202 nop 203 204 SAVE_SOME 205 SAVE_AT 206 SAVE_TEMP 207 SAVE_STATIC 208 209 PTR_LA t9, do_ejtag_debug 210 jalr t9 211 move a0, sp 212 213 RESTORE_TEMP 214 RESTORE_STATIC 215 RESTORE_AT 216 RESTORE_SOME 217 RESTORE_SP 218 219 ejtag_return: 220 MFC0 k1, CP0_DESAVE 221 deret 222 .set pop 223 END(handle_ejtag_debug) 224