| 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, 160
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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 | mfsprg1 r12
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| 113 | stw r12, 152(sp)
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| 114 |
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| 115 | mfsprg2 r12
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| 116 | stw r12, 156(sp)
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| 117 | .endm
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| 118 |
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| 119 | .org 0x060
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| 120 | jump_to_kernel:
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| 121 | lis r12, iret@ha
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| 122 | addi r12, r12, iret@l
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| 123 | mtlr r12
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| 124 |
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| 125 | mfmsr r12
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| 126 | ori r12, r12, (msr_ir | msr_dr)@l
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| 127 | mtsrr1 r12
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| 128 |
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| 129 | addis sp, sp, 0x8000
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| 130 | mr r4, sp
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| 131 | addi r4, r4, 8
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| 132 |
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| 133 | rfi
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| 134 |
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| 135 | jump_to_kernel_syscall:
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| 136 | lis r12, syscall_handler@ha
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| 137 | addi r12, r12, syscall_handler@l
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| 138 | mtsrr0 r12
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| 139 |
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| 140 | lis r12, iret_syscall@ha
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| 141 | addi r12, r12, iret_syscall@l
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| 142 | mtlr r12
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| 143 |
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| 144 | mfmsr r12
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| 145 | ori r12, r12, (msr_ir | msr_dr)@l
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| 146 | mtsrr1 r12
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| 147 |
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| 148 | addis sp, sp, 0x8000
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| 149 | rfi
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| 150 |
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| 151 | .org 0x100
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| 152 | .global exc_system_reset
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| 153 | exc_system_reset:
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| 154 | b exc_system_reset
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| 155 |
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| 156 | .org 0x200
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| 157 | .global exc_machine_check
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| 158 | exc_machine_check:
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| 159 | b exc_machine_check
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| 160 |
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| 161 | .org 0x300
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| 162 | .global exc_data_storage
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| 163 | exc_data_storage:
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| 164 | CONTEXT_STORE
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| 165 |
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| 166 | lis r12, pht_refill@ha
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| 167 | addi r12, r12, pht_refill@l
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| 168 | mtsrr0 r12
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| 169 |
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| 170 | li r3, 1
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| 171 | b jump_to_kernel
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| 172 |
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| 173 | .org 0x400
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| 174 | .global exc_instruction_storage
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| 175 | exc_instruction_storage:
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| 176 | CONTEXT_STORE
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| 177 |
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| 178 | lis r12, pht_refill@ha
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| 179 | addi r12, r12, pht_refill@l
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| 180 | mtsrr0 r12
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| 181 |
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| 182 | li r3, 0
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| 183 | b jump_to_kernel
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| 184 |
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| 185 | .org 0x500
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| 186 | .global exc_external
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| 187 | exc_external:
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| 188 | b exc_external
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| 189 |
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| 190 | .org 0x600
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| 191 | .global exc_alignment
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| 192 | exc_alignment:
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| 193 | b exc_alignment
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| 194 |
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| 195 | .org 0x700
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| 196 | .global exc_program
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| 197 | exc_program:
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| 198 | b exc_program
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| 199 |
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| 200 | .org 0x800
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| 201 | .global exc_fp_unavailable
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| 202 | exc_fp_unavailable:
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| 203 | b exc_fp_unavailable
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| 204 |
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| 205 | .org 0x900
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| 206 | .global exc_decrementer
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| 207 | exc_decrementer:
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| 208 | CONTEXT_STORE
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| 209 |
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| 210 | lis r12, exc_dispatch@ha
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| 211 | addi r12, r12, exc_dispatch@l
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| 212 | mtsrr0 r12
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| 213 |
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| 214 | li r3, 10
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| 215 | b jump_to_kernel
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| 216 |
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| 217 | .org 0xa00
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| 218 | .global exc_reserved0
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| 219 | exc_reserved0:
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| 220 | b exc_reserved0
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| 221 |
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| 222 | .org 0xb00
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| 223 | .global exc_reserved1
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| 224 | exc_reserved1:
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| 225 | b exc_reserved1
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| 226 |
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| 227 | .org 0xc00
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| 228 | .global exc_syscall
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| 229 | exc_syscall:
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| 230 | CONTEXT_STORE
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| 231 |
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| 232 | b jump_to_kernel_syscall
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| 233 |
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| 234 | .org 0xd00
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| 235 | .global exc_trace
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| 236 | exc_trace:
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| 237 | b exc_trace
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