| 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/mm/page.h>
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| 31 |
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| 32 | .section K_UNMAPPED_TEXT_START, "ax"
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| 33 |
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| 34 | .macro CONTEXT_STORE
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| 35 |
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| 36 | # save R12 in SPRG1, backup CR in R12
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| 37 | # save SP in SPRG2
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| 38 |
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| 39 | mtsprg1 r12
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| 40 | mfcr r12
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| 41 | mtsprg2 sp
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| 42 |
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| 43 | # check whether SP is in kernel
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| 44 |
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| 45 | andis. sp, sp, 0x8000
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| 46 | bne 1f
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| 47 |
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| 48 | # stack is in user-space
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| 49 |
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| 50 | mfsprg0 sp
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| 51 |
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| 52 | b 2f
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| 53 |
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| 54 | 1:
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| 55 |
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| 56 | # stack is in kernel
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| 57 |
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| 58 | mfsprg2 sp
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| 59 | subis sp, sp, 0x8000
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| 60 |
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| 61 | 2:
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| 62 |
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| 63 | subi sp, sp, 164
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| 64 | stw r0, 8(sp)
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| 65 | stw r2, 12(sp)
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| 66 | stw r3, 16(sp)
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| 67 | stw r4, 20(sp)
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| 68 | stw r5, 24(sp)
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| 69 | stw r6, 28(sp)
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| 70 | stw r7, 32(sp)
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| 71 | stw r8, 36(sp)
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| 72 | stw r9, 40(sp)
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| 73 | stw r10, 44(sp)
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| 74 | stw r11, 48(sp)
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| 75 | stw r13, 52(sp)
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| 76 | stw r14, 56(sp)
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| 77 | stw r15, 60(sp)
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| 78 | stw r16, 64(sp)
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| 79 | stw r17, 68(sp)
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| 80 | stw r18, 72(sp)
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| 81 | stw r19, 76(sp)
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| 82 | stw r20, 80(sp)
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| 83 | stw r21, 84(sp)
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| 84 | stw r22, 88(sp)
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| 85 | stw r23, 92(sp)
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| 86 | stw r24, 96(sp)
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| 87 | stw r25, 100(sp)
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| 88 | stw r26, 104(sp)
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| 89 | stw r27, 108(sp)
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| 90 | stw r28, 112(sp)
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| 91 | stw r29, 116(sp)
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| 92 | stw r30, 120(sp)
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| 93 | stw r31, 124(sp)
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| 94 |
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| 95 | stw r12, 128(sp)
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| 96 |
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| 97 | mfsrr0 r12
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| 98 | stw r12, 132(sp)
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| 99 |
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| 100 | mfsrr1 r12
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| 101 | stw r12, 136(sp)
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| 102 |
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| 103 | mflr r12
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| 104 | stw r12, 140(sp)
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| 105 |
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| 106 | mfctr r12
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| 107 | stw r12, 144(sp)
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| 108 |
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| 109 | mfxer r12
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| 110 | stw r12, 148(sp)
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| 111 |
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| 112 | mfdar r12
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| 113 | stw r12, 152(sp)
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| 114 |
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| 115 | mfsprg1 r12
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| 116 | stw r12, 156(sp)
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| 117 |
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| 118 | mfsprg2 r12
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| 119 | stw r12, 160(sp)
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| 120 | .endm
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| 121 |
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| 122 | .org 0x100
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| 123 | .global exc_system_reset
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| 124 | exc_system_reset:
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| 125 | CONTEXT_STORE
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| 126 |
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| 127 | li r3, 0
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| 128 | b jump_to_kernel
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| 129 |
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| 130 | .org 0x200
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| 131 | .global exc_machine_check
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| 132 | exc_machine_check:
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| 133 | CONTEXT_STORE
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| 134 |
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| 135 | li r3, 1
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| 136 | b jump_to_kernel
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| 137 |
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| 138 | .org 0x300
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| 139 | .global exc_data_storage
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| 140 | exc_data_storage:
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| 141 | CONTEXT_STORE
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| 142 |
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| 143 | b data_storage
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| 144 |
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| 145 | .org 0x400
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| 146 | .global exc_instruction_storage
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| 147 | exc_instruction_storage:
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| 148 | CONTEXT_STORE
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| 149 |
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| 150 | b instruction_storage
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| 151 |
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| 152 | .org 0x500
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| 153 | .global exc_external
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| 154 | exc_external:
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| 155 | CONTEXT_STORE
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| 156 |
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| 157 | li r3, 4
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| 158 | b jump_to_kernel
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| 159 |
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| 160 | .org 0x600
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| 161 | .global exc_alignment
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| 162 | exc_alignment:
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| 163 | CONTEXT_STORE
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| 164 |
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| 165 | li r3, 5
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| 166 | b jump_to_kernel
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| 167 |
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| 168 | .org 0x700
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| 169 | .global exc_program
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| 170 | exc_program:
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| 171 | CONTEXT_STORE
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| 172 |
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| 173 | li r3, 6
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| 174 | b jump_to_kernel
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| 175 |
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| 176 | .org 0x800
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| 177 | .global exc_fp_unavailable
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| 178 | exc_fp_unavailable:
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| 179 | CONTEXT_STORE
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| 180 |
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| 181 | li r3, 7
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| 182 | b jump_to_kernel
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| 183 |
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| 184 | .org 0x900
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| 185 | .global exc_decrementer
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| 186 | exc_decrementer:
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| 187 | CONTEXT_STORE
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| 188 |
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| 189 | li r3, 8
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| 190 | b jump_to_kernel
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| 191 |
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| 192 | .org 0xa00
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| 193 | .global exc_reserved0
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| 194 | exc_reserved0:
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| 195 | CONTEXT_STORE
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| 196 |
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| 197 | li r3, 9
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| 198 | b jump_to_kernel
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| 199 |
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| 200 | .org 0xb00
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| 201 | .global exc_reserved1
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| 202 | exc_reserved1:
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| 203 | CONTEXT_STORE
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| 204 |
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| 205 | li r3, 10
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| 206 | b jump_to_kernel
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| 207 |
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| 208 | .org 0xc00
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| 209 | .global exc_syscall
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| 210 | exc_syscall:
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| 211 | CONTEXT_STORE
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| 212 |
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| 213 | b jump_to_kernel_syscall
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| 214 |
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| 215 | .org 0xd00
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| 216 | .global exc_trace
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| 217 | exc_trace:
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| 218 | CONTEXT_STORE
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| 219 |
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| 220 | li r3, 12
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| 221 | b jump_to_kernel
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| 222 |
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| 223 | .org 0x4000
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| 224 | data_storage:
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| 225 | li r3, 2
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| 226 | mr r4, sp
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| 227 | addi r4, r4, 8
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| 228 | bl pht_refill_real
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| 229 |
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| 230 | cmpwi r3, 0
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| 231 | bne iret_real
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| 232 |
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| 233 | li r3, 2
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| 234 | b jump_to_kernel
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| 235 |
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| 236 | instruction_storage:
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| 237 | li r3, 3
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| 238 | mr r4, sp
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| 239 | addi r4, r4, 8
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| 240 | bl pht_refill_real
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| 241 |
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| 242 | cmpwi r3, 0
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| 243 | bne iret_real
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| 244 |
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| 245 | li r3, 3
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| 246 | b jump_to_kernel
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| 247 |
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| 248 | jump_to_kernel:
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| 249 | lis r12, iret@ha
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| 250 | addi r12, r12, iret@l
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| 251 | mtlr r12
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| 252 |
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| 253 | lis r12, exc_dispatch@ha
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| 254 | addi r12, r12, exc_dispatch@l
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| 255 | mtsrr0 r12
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| 256 |
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| 257 | mfmsr r12
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| 258 | ori r12, r12, (msr_ir | msr_dr)@l
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| 259 | mtsrr1 r12
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| 260 |
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| 261 | addis sp, sp, 0x8000
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| 262 | mr r4, sp
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| 263 | addi r4, r4, 8
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| 264 |
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| 265 | rfi
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| 266 |
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| 267 | jump_to_kernel_syscall:
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| 268 | lis r12, syscall_handler@ha
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| 269 | addi r12, r12, syscall_handler@l
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| 270 | mtsrr0 r12
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| 271 |
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| 272 | lis r12, iret_syscall@ha
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| 273 | addi r12, r12, iret_syscall@l
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| 274 | mtlr r12
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| 275 |
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| 276 | mfmsr r12
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| 277 | ori r12, r12, (msr_ir | msr_dr)@l
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| 278 | mtsrr1 r12
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| 279 |
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| 280 | addis sp, sp, 0x8000
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| 281 | rfi
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| 282 |
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| 283 | iret_real:
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| 284 | lwz r0, 8(sp)
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| 285 | lwz r2, 12(sp)
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| 286 | lwz r3, 16(sp)
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| 287 | lwz r4, 20(sp)
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| 288 | lwz r5, 24(sp)
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| 289 | lwz r6, 28(sp)
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| 290 | lwz r7, 32(sp)
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| 291 | lwz r8, 36(sp)
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| 292 | lwz r9, 40(sp)
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| 293 | lwz r10, 44(sp)
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| 294 | lwz r11, 48(sp)
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| 295 | lwz r13, 52(sp)
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| 296 | lwz r14, 56(sp)
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| 297 | lwz r15, 60(sp)
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| 298 | lwz r16, 64(sp)
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| 299 | lwz r17, 68(sp)
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| 300 | lwz r18, 72(sp)
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| 301 | lwz r19, 76(sp)
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| 302 | lwz r20, 80(sp)
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| 303 | lwz r21, 84(sp)
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| 304 | lwz r22, 88(sp)
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| 305 | lwz r23, 92(sp)
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| 306 | lwz r24, 96(sp)
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| 307 | lwz r25, 100(sp)
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| 308 | lwz r26, 104(sp)
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| 309 | lwz r27, 108(sp)
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| 310 | lwz r28, 112(sp)
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| 311 | lwz r29, 116(sp)
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| 312 | lwz r30, 120(sp)
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| 313 | lwz r31, 124(sp)
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| 314 |
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| 315 | lwz r12, 128(sp)
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| 316 | mtcr r12
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| 317 |
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| 318 | lwz r12, 132(sp)
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| 319 | mtsrr0 r12
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| 320 |
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| 321 | lwz r12, 136(sp)
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| 322 | mtsrr1 r12
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| 323 |
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| 324 | lwz r12, 140(sp)
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| 325 | mtlr r12
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| 326 |
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| 327 | lwz r12, 144(sp)
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| 328 | mtctr r12
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| 329 |
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| 330 | lwz r12, 148(sp)
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| 331 | mtxer r12
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| 332 |
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| 333 | lwz r12, 156(sp)
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| 334 | lwz sp, 160(sp)
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| 335 |
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| 336 | rfi
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