| 1 | #
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| 2 | # Copyright (c) 2006 Martin Decky
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 |
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| 29 | #include <arch/asm/regname.h>
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| 30 | #include <arch/cpu.h>
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| 31 | #include <arch/mm/page.h>
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| 32 |
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| 33 | .section K_UNMAPPED_TEXT_START, "ax"
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| 34 |
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| 35 | .macro CONTEXT_STORE
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| 36 |
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| 37 | # save r12 in SPRG1, backup CR in r12
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| 38 | # save SP in SPRG2
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| 39 |
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| 40 | mtsprg1 r12
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| 41 | mfcr r12
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| 42 | mtsprg2 sp
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| 43 |
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| 44 | # check whether SP is in kernel
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| 45 |
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| 46 | andis. sp, sp, 0x8000
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| 47 | bne 1f
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| 48 |
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| 49 | # stack is in user-space
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| 50 |
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| 51 | mfsprg0 sp
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| 52 |
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| 53 | b 2f
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| 54 |
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| 55 | 1:
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| 56 |
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| 57 | # stack is in kernel
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| 58 |
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| 59 | mfsprg2 sp
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| 60 | subis sp, sp, 0x8000
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| 61 |
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| 62 | 2:
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| 63 |
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| 64 | subi sp, sp, 164
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| 65 | stw r0, 8(sp)
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| 66 | stw r2, 12(sp)
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| 67 | stw r3, 16(sp)
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| 68 | stw r4, 20(sp)
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| 69 | stw r5, 24(sp)
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| 70 | stw r6, 28(sp)
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| 71 | stw r7, 32(sp)
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| 72 | stw r8, 36(sp)
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| 73 | stw r9, 40(sp)
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| 74 | stw r10, 44(sp)
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| 75 | stw r11, 48(sp)
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| 76 | stw r13, 52(sp)
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| 77 | stw r14, 56(sp)
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| 78 | stw r15, 60(sp)
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| 79 | stw r16, 64(sp)
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| 80 | stw r17, 68(sp)
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| 81 | stw r18, 72(sp)
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| 82 | stw r19, 76(sp)
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| 83 | stw r20, 80(sp)
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| 84 | stw r21, 84(sp)
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| 85 | stw r22, 88(sp)
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| 86 | stw r23, 92(sp)
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| 87 | stw r24, 96(sp)
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| 88 | stw r25, 100(sp)
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| 89 | stw r26, 104(sp)
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| 90 | stw r27, 108(sp)
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| 91 | stw r28, 112(sp)
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| 92 | stw r29, 116(sp)
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| 93 | stw r30, 120(sp)
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| 94 | stw r31, 124(sp)
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| 95 |
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| 96 | stw r12, 128(sp)
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| 97 |
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| 98 | mfsrr0 r12
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| 99 | stw r12, 132(sp)
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| 100 |
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| 101 | mfsrr1 r12
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| 102 | stw r12, 136(sp)
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| 103 |
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| 104 | mflr r12
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| 105 | stw r12, 140(sp)
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| 106 |
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| 107 | mfctr r12
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| 108 | stw r12, 144(sp)
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| 109 |
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| 110 | mfxer r12
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| 111 | stw r12, 148(sp)
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| 112 |
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| 113 | mfdar r12
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| 114 | stw r12, 152(sp)
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| 115 |
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| 116 | mfsprg1 r12
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| 117 | stw r12, 156(sp)
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| 118 |
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| 119 | mfsprg2 r12
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| 120 | stw r12, 160(sp)
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| 121 | .endm
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| 122 |
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| 123 | .org 0x100
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| 124 | .global exc_system_reset
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| 125 | exc_system_reset:
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| 126 | CONTEXT_STORE
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| 127 |
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| 128 | li r3, 0
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| 129 | b jump_to_kernel
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| 130 |
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| 131 | .org 0x200
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| 132 | .global exc_machine_check
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| 133 | exc_machine_check:
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| 134 | CONTEXT_STORE
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| 135 |
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| 136 | li r3, 1
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| 137 | b jump_to_kernel
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| 138 |
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| 139 | .org 0x300
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| 140 | .global exc_data_storage
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| 141 | exc_data_storage:
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| 142 | CONTEXT_STORE
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| 143 |
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| 144 | b data_storage
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| 145 |
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| 146 | .org 0x400
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| 147 | .global exc_instruction_storage
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| 148 | exc_instruction_storage:
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| 149 | CONTEXT_STORE
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| 150 |
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| 151 | b instruction_storage
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| 152 |
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| 153 | .org 0x500
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| 154 | .global exc_external
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| 155 | exc_external:
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| 156 | CONTEXT_STORE
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| 157 |
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| 158 | li r3, 4
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| 159 | b jump_to_kernel
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| 160 |
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| 161 | .org 0x600
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| 162 | .global exc_alignment
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| 163 | exc_alignment:
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| 164 | CONTEXT_STORE
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| 165 |
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| 166 | li r3, 5
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| 167 | b jump_to_kernel
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| 168 |
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| 169 | .org 0x700
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| 170 | .global exc_program
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| 171 | exc_program:
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| 172 | CONTEXT_STORE
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| 173 |
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| 174 | li r3, 6
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| 175 | b jump_to_kernel
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| 176 |
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| 177 | .org 0x800
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| 178 | .global exc_fp_unavailable
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| 179 | exc_fp_unavailable:
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| 180 | CONTEXT_STORE
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| 181 |
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| 182 | li r3, 7
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| 183 | b jump_to_kernel
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| 184 |
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| 185 | .org 0x900
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| 186 | .global exc_decrementer
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| 187 | exc_decrementer:
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| 188 | CONTEXT_STORE
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| 189 |
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| 190 | li r3, 8
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| 191 | b jump_to_kernel
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| 192 |
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| 193 | .org 0xa00
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| 194 | .global exc_reserved0
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| 195 | exc_reserved0:
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| 196 | CONTEXT_STORE
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| 197 |
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| 198 | li r3, 9
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| 199 | b jump_to_kernel
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| 200 |
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| 201 | .org 0xb00
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| 202 | .global exc_reserved1
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| 203 | exc_reserved1:
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| 204 | CONTEXT_STORE
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| 205 |
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| 206 | li r3, 10
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| 207 | b jump_to_kernel
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| 208 |
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| 209 | .org 0xc00
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| 210 | .global exc_syscall
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| 211 | exc_syscall:
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| 212 | CONTEXT_STORE
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| 213 |
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| 214 | b jump_to_kernel_syscall
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| 215 |
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| 216 | .org 0xd00
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| 217 | .global exc_trace
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| 218 | exc_trace:
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| 219 | CONTEXT_STORE
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| 220 |
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| 221 | li r3, 12
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| 222 | b jump_to_kernel
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| 223 |
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| 224 | .org 0x1000
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| 225 | .global exc_itlb_miss
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| 226 | exc_itlb_miss:
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| 227 | CONTEXT_STORE
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| 228 |
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| 229 | b tlb_miss
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| 230 |
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| 231 | .org 0x1100
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| 232 | .global exc_dtlb_miss_load
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| 233 | exc_dtlb_miss_load:
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| 234 | CONTEXT_STORE
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| 235 |
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| 236 | b tlb_miss
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| 237 |
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| 238 | .org 0x1200
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| 239 | .global exc_dtlb_miss_store
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| 240 | exc_dtlb_miss_store:
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| 241 | CONTEXT_STORE
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| 242 |
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| 243 | b tlb_miss
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| 244 |
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| 245 | .org 0x4000
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| 246 | data_storage:
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| 247 | li r3, 2
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| 248 | mr r4, sp
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| 249 | addi r4, r4, 8
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| 250 | bl pht_refill_real
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| 251 |
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| 252 | cmpwi r3, 0
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| 253 | bne iret_real
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| 254 |
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| 255 | li r3, 2
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| 256 | b jump_to_kernel
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| 257 |
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| 258 | instruction_storage:
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| 259 | li r3, 3
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| 260 | mr r4, sp
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| 261 | addi r4, r4, 8
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| 262 | bl pht_refill_real
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| 263 |
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| 264 | cmpwi r3, 0
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| 265 | bne iret_real
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| 266 |
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| 267 | li r3, 3
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| 268 | b jump_to_kernel
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| 269 |
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| 270 | tlb_miss:
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| 271 | li r3, 16
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| 272 | mfspr r4, tlbmiss
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| 273 | mfspr r5, ptehi
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| 274 | mfspr r6, ptelo
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| 275 | mr r7, sp
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| 276 | addi r7, r7, 20
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| 277 |
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| 278 | bl tlb_refill_real
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| 279 | b iret_real
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| 280 |
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| 281 | jump_to_kernel:
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| 282 | lis r12, iret@ha
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| 283 | addi r12, r12, iret@l
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| 284 | mtlr r12
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| 285 |
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| 286 | lis r12, exc_dispatch@ha
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| 287 | addi r12, r12, exc_dispatch@l
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| 288 | mtsrr0 r12
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| 289 |
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| 290 | mfmsr r12
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| 291 | ori r12, r12, (MSR_IR | MSR_DR)@l
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| 292 | mtsrr1 r12
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| 293 |
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| 294 | addis sp, sp, 0x8000
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| 295 | mr r4, sp
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| 296 | addi r4, r4, 8
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| 297 |
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| 298 | rfi
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| 299 |
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| 300 | jump_to_kernel_syscall:
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| 301 | lis r12, syscall_handler@ha
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| 302 | addi r12, r12, syscall_handler@l
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| 303 | mtsrr0 r12
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| 304 |
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| 305 | lis r12, iret_syscall@ha
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| 306 | addi r12, r12, iret_syscall@l
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| 307 | mtlr r12
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| 308 |
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| 309 | mfmsr r12
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| 310 | ori r12, r12, (MSR_IR | MSR_DR)@l
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| 311 | mtsrr1 r12
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| 312 |
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| 313 | addis sp, sp, 0x8000
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| 314 | rfi
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| 315 |
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| 316 | iret_real:
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| 317 | lwz r0, 8(sp)
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| 318 | lwz r2, 12(sp)
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| 319 | lwz r3, 16(sp)
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| 320 | lwz r4, 20(sp)
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| 321 | lwz r5, 24(sp)
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| 322 | lwz r6, 28(sp)
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| 323 | lwz r7, 32(sp)
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| 324 | lwz r8, 36(sp)
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| 325 | lwz r9, 40(sp)
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| 326 | lwz r10, 44(sp)
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| 327 | lwz r11, 48(sp)
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| 328 | lwz r13, 52(sp)
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| 329 | lwz r14, 56(sp)
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| 330 | lwz r15, 60(sp)
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| 331 | lwz r16, 64(sp)
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| 332 | lwz r17, 68(sp)
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| 333 | lwz r18, 72(sp)
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| 334 | lwz r19, 76(sp)
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| 335 | lwz r20, 80(sp)
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| 336 | lwz r21, 84(sp)
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| 337 | lwz r22, 88(sp)
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| 338 | lwz r23, 92(sp)
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| 339 | lwz r24, 96(sp)
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| 340 | lwz r25, 100(sp)
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| 341 | lwz r26, 104(sp)
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| 342 | lwz r27, 108(sp)
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| 343 | lwz r28, 112(sp)
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| 344 | lwz r29, 116(sp)
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| 345 | lwz r30, 120(sp)
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| 346 | lwz r31, 124(sp)
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| 347 |
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| 348 | lwz r12, 128(sp)
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| 349 | mtcr r12
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| 350 |
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| 351 | lwz r12, 132(sp)
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| 352 | mtsrr0 r12
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| 353 |
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| 354 | lwz r12, 136(sp)
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| 355 | mtsrr1 r12
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| 356 |
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| 357 | lwz r12, 140(sp)
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| 358 | mtlr r12
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| 359 |
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| 360 | lwz r12, 144(sp)
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| 361 | mtctr r12
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| 362 |
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| 363 | lwz r12, 148(sp)
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| 364 | mtxer r12
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| 365 |
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| 366 | lwz r12, 156(sp)
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| 367 | lwz sp, 160(sp)
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| 368 |
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| 369 | rfi
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