| Daniel Schwierzeck | e8d3155 | 2016-01-09 18:34:14 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle |
| 3 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
| 4 | * Copyright (C) 2002, 2007 Maciej W. Rozycki |
| 5 | * Copyright (C) 2001, 2012 MIPS Technologies, Inc. All rights reserved. |
| 6 | * |
| 7 | * SPDX-License-Identifier: GPL-2.0+ |
| 8 | */ |
| 9 | |
| 10 | #include <asm/asm.h> |
| 11 | #include <asm/regdef.h> |
| 12 | #include <asm/mipsregs.h> |
| 13 | #include <asm/asm-offsets.h> |
| 14 | |
| 15 | #define STATMASK 0x1f |
| 16 | |
| 17 | .set noreorder |
| 18 | |
| 19 | /* |
| 20 | * Macros copied and adapted from Linux MIPS |
| 21 | */ |
| 22 | .macro SAVE_AT |
| 23 | .set push |
| 24 | .set noat |
| 25 | LONG_S $1, PT_R1(sp) |
| 26 | .set pop |
| 27 | .endm |
| 28 | |
| 29 | .macro SAVE_TEMP |
| 30 | #if __mips_isa_rev < 6 |
| 31 | mfhi v1 |
| 32 | #endif |
| 33 | #ifdef CONFIG_32BIT |
| 34 | LONG_S $8, PT_R8(sp) |
| 35 | LONG_S $9, PT_R9(sp) |
| 36 | #endif |
| 37 | LONG_S $10, PT_R10(sp) |
| 38 | LONG_S $11, PT_R11(sp) |
| 39 | LONG_S $12, PT_R12(sp) |
| 40 | #if __mips_isa_rev < 6 |
| 41 | LONG_S v1, PT_HI(sp) |
| 42 | mflo v1 |
| 43 | #endif |
| 44 | LONG_S $13, PT_R13(sp) |
| 45 | LONG_S $14, PT_R14(sp) |
| 46 | LONG_S $15, PT_R15(sp) |
| 47 | LONG_S $24, PT_R24(sp) |
| 48 | #if __mips_isa_rev < 6 |
| 49 | LONG_S v1, PT_LO(sp) |
| 50 | #endif |
| 51 | .endm |
| 52 | |
| 53 | .macro SAVE_STATIC |
| 54 | LONG_S $16, PT_R16(sp) |
| 55 | LONG_S $17, PT_R17(sp) |
| 56 | LONG_S $18, PT_R18(sp) |
| 57 | LONG_S $19, PT_R19(sp) |
| 58 | LONG_S $20, PT_R20(sp) |
| 59 | LONG_S $21, PT_R21(sp) |
| 60 | LONG_S $22, PT_R22(sp) |
| 61 | LONG_S $23, PT_R23(sp) |
| 62 | LONG_S $30, PT_R30(sp) |
| 63 | .endm |
| 64 | |
| 65 | .macro SAVE_SOME |
| 66 | .set push |
| 67 | .set noat |
| 68 | PTR_SUBU k1, sp, PT_SIZE |
| 69 | LONG_S sp, PT_R29(k1) |
| 70 | move sp, k1 |
| 71 | |
| 72 | LONG_S $3, PT_R3(sp) |
| 73 | LONG_S $0, PT_R0(sp) |
| 74 | mfc0 v1, CP0_STATUS |
| 75 | LONG_S $2, PT_R2(sp) |
| 76 | LONG_S v1, PT_STATUS(sp) |
| 77 | LONG_S $4, PT_R4(sp) |
| 78 | mfc0 v1, CP0_CAUSE |
| 79 | LONG_S $5, PT_R5(sp) |
| 80 | LONG_S v1, PT_CAUSE(sp) |
| 81 | LONG_S $6, PT_R6(sp) |
| 82 | MFC0 v1, CP0_EPC |
| 83 | LONG_S $7, PT_R7(sp) |
| 84 | #ifdef CONFIG_64BIT |
| 85 | LONG_S $8, PT_R8(sp) |
| 86 | LONG_S $9, PT_R9(sp) |
| 87 | #endif |
| 88 | LONG_S v1, PT_EPC(sp) |
| 89 | LONG_S $25, PT_R25(sp) |
| 90 | LONG_S $28, PT_R28(sp) |
| 91 | LONG_S $31, PT_R31(sp) |
| 92 | .set pop |
| 93 | .endm |
| 94 | |
| 95 | .macro RESTORE_AT |
| 96 | .set push |
| 97 | .set noat |
| 98 | LONG_L $1, PT_R1(sp) |
| 99 | .set pop |
| 100 | .endm |
| 101 | |
| 102 | .macro RESTORE_TEMP |
| 103 | #if __mips_isa_rev < 6 |
| 104 | LONG_L $24, PT_LO(sp) |
| 105 | mtlo $24 |
| 106 | LONG_L $24, PT_HI(sp) |
| 107 | mthi $24 |
| 108 | #endif |
| 109 | #ifdef CONFIG_32BIT |
| 110 | LONG_L $8, PT_R8(sp) |
| 111 | LONG_L $9, PT_R9(sp) |
| 112 | #endif |
| 113 | LONG_L $10, PT_R10(sp) |
| 114 | LONG_L $11, PT_R11(sp) |
| 115 | LONG_L $12, PT_R12(sp) |
| 116 | LONG_L $13, PT_R13(sp) |
| 117 | LONG_L $14, PT_R14(sp) |
| 118 | LONG_L $15, PT_R15(sp) |
| 119 | LONG_L $24, PT_R24(sp) |
| 120 | .endm |
| 121 | |
| 122 | .macro RESTORE_STATIC |
| 123 | LONG_L $16, PT_R16(sp) |
| 124 | LONG_L $17, PT_R17(sp) |
| 125 | LONG_L $18, PT_R18(sp) |
| 126 | LONG_L $19, PT_R19(sp) |
| 127 | LONG_L $20, PT_R20(sp) |
| 128 | LONG_L $21, PT_R21(sp) |
| 129 | LONG_L $22, PT_R22(sp) |
| 130 | LONG_L $23, PT_R23(sp) |
| 131 | LONG_L $30, PT_R30(sp) |
| 132 | .endm |
| 133 | |
| 134 | .macro RESTORE_SOME |
| 135 | .set push |
| 136 | .set reorder |
| 137 | .set noat |
| 138 | mfc0 a0, CP0_STATUS |
| 139 | ori a0, STATMASK |
| 140 | xori a0, STATMASK |
| 141 | mtc0 a0, CP0_STATUS |
| 142 | li v1, ST0_CU1 | ST0_FR | ST0_IM |
| 143 | and a0, v1 |
| 144 | LONG_L v0, PT_STATUS(sp) |
| 145 | nor v1, $0, v1 |
| 146 | and v0, v1 |
| 147 | or v0, a0 |
| 148 | mtc0 v0, CP0_STATUS |
| 149 | LONG_L v1, PT_EPC(sp) |
| 150 | MTC0 v1, CP0_EPC |
| 151 | LONG_L $31, PT_R31(sp) |
| 152 | LONG_L $28, PT_R28(sp) |
| 153 | LONG_L $25, PT_R25(sp) |
| 154 | #ifdef CONFIG_64BIT |
| 155 | LONG_L $8, PT_R8(sp) |
| 156 | LONG_L $9, PT_R9(sp) |
| 157 | #endif |
| 158 | LONG_L $7, PT_R7(sp) |
| 159 | LONG_L $6, PT_R6(sp) |
| 160 | LONG_L $5, PT_R5(sp) |
| 161 | LONG_L $4, PT_R4(sp) |
| 162 | LONG_L $3, PT_R3(sp) |
| 163 | LONG_L $2, PT_R2(sp) |
| 164 | .set pop |
| 165 | .endm |
| 166 | |
| 167 | .macro RESTORE_SP |
| 168 | LONG_L sp, PT_R29(sp) |
| 169 | .endm |
| 170 | |
| 171 | NESTED(except_vec3_generic, 0, sp) |
| 172 | PTR_LA k1, handle_reserved |
| 173 | jr k1 |
| 174 | nop |
| 175 | END(except_vec3_generic) |
| 176 | |
| 177 | NESTED(except_vec_ejtag_debug, 0, sp) |
| 178 | PTR_LA k1, handle_ejtag_debug |
| 179 | jr k1 |
| 180 | nop |
| 181 | END(except_vec_ejtag_debug) |
| 182 | |
| 183 | NESTED(handle_reserved, PT_SIZE, sp) |
| 184 | SAVE_SOME |
| 185 | SAVE_AT |
| 186 | SAVE_TEMP |
| 187 | SAVE_STATIC |
| 188 | |
| 189 | PTR_LA t9, do_reserved |
| 190 | jr t9 |
| 191 | move a0, sp |
| 192 | END(handle_reserved) |
| 193 | |
| 194 | NESTED(handle_ejtag_debug, PT_SIZE, sp) |
| 195 | .set push |
| 196 | .set noat |
| 197 | MTC0 k1, CP0_DESAVE |
| 198 | |
| 199 | /* Check for SDBBP */ |
| 200 | MFC0 k1, CP0_DEBUG |
| 201 | sll k1, k1, 30 |
| 202 | bgez k1, ejtag_return |
| 203 | nop |
| 204 | |
| 205 | SAVE_SOME |
| 206 | SAVE_AT |
| 207 | SAVE_TEMP |
| 208 | SAVE_STATIC |
| 209 | |
| 210 | PTR_LA t9, do_ejtag_debug |
| 211 | jalr t9 |
| 212 | move a0, sp |
| 213 | |
| 214 | RESTORE_TEMP |
| 215 | RESTORE_STATIC |
| 216 | RESTORE_AT |
| 217 | RESTORE_SOME |
| 218 | RESTORE_SP |
| 219 | |
| 220 | ejtag_return: |
| 221 | MFC0 k1, CP0_DESAVE |
| 222 | deret |
| 223 | .set pop |
| 224 | END(handle_ejtag_debug) |