| 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 <abi/asmtool.h>
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| 30 | #include <arch/asm/regname.h>
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| 31 | #include <arch/msr.h>
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| 32 | #include <arch/mm/page.h>
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| 33 | #include <arch/istate_struct.h>
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| 34 | #include <arch/stack.h>
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| 35 | #include <align.h>
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| 36 |
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| 37 | .section K_UNMAPPED_TEXT_START, "ax"
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| 38 |
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| 39 | .macro CONTEXT_STORE
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| 40 |
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| 41 | # save r12 in SPRG1, backup CR in r12
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| 42 | # save SP in SPRG2
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| 43 |
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| 44 | mtsprg1 r12
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| 45 | mfcr r12
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| 46 | mtsprg2 sp
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| 47 |
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| 48 | # check whether the previous mode was user or kernel
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| 49 |
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| 50 | mfsrr1 sp # use sp as a temporary register to hold SRR1
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| 51 | andi. sp, sp, MSR_PR
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| 52 | bne 1f
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| 53 | # previous mode was kernel
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| 54 |
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| 55 | mfsprg2 sp
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| 56 | subis sp, sp, 0x8000
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| 57 | b 2f
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| 58 |
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| 59 | 1:
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| 60 | # previous mode was user
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| 61 |
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| 62 | mfsprg0 sp
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| 63 | 2:
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| 64 |
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| 65 | subi sp, sp, ALIGN_UP(ISTATE_SIZE, STACK_ALIGNMENT)
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| 66 | stw r0, ISTATE_OFFSET_R0(sp)
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| 67 | stw r2, ISTATE_OFFSET_R2(sp)
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| 68 | stw r3, ISTATE_OFFSET_R3(sp)
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| 69 | stw r4, ISTATE_OFFSET_R4(sp)
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| 70 | stw r5, ISTATE_OFFSET_R5(sp)
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| 71 | stw r6, ISTATE_OFFSET_R6(sp)
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| 72 | stw r7, ISTATE_OFFSET_R7(sp)
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| 73 | stw r8, ISTATE_OFFSET_R8(sp)
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| 74 | stw r9, ISTATE_OFFSET_R9(sp)
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| 75 | stw r10, ISTATE_OFFSET_R10(sp)
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| 76 | stw r11, ISTATE_OFFSET_R11(sp)
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| 77 | stw r13, ISTATE_OFFSET_R13(sp)
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| 78 | stw r14, ISTATE_OFFSET_R14(sp)
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| 79 | stw r15, ISTATE_OFFSET_R15(sp)
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| 80 | stw r16, ISTATE_OFFSET_R16(sp)
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| 81 | stw r17, ISTATE_OFFSET_R17(sp)
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| 82 | stw r18, ISTATE_OFFSET_R18(sp)
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| 83 | stw r19, ISTATE_OFFSET_R19(sp)
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| 84 | stw r20, ISTATE_OFFSET_R20(sp)
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| 85 | stw r21, ISTATE_OFFSET_R21(sp)
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| 86 | stw r22, ISTATE_OFFSET_R22(sp)
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| 87 | stw r23, ISTATE_OFFSET_R23(sp)
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| 88 | stw r24, ISTATE_OFFSET_R24(sp)
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| 89 | stw r25, ISTATE_OFFSET_R25(sp)
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| 90 | stw r26, ISTATE_OFFSET_R26(sp)
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| 91 | stw r27, ISTATE_OFFSET_R27(sp)
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| 92 | stw r28, ISTATE_OFFSET_R28(sp)
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| 93 | stw r29, ISTATE_OFFSET_R29(sp)
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| 94 | stw r30, ISTATE_OFFSET_R30(sp)
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| 95 | stw r31, ISTATE_OFFSET_R31(sp)
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| 96 |
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| 97 | stw r12, ISTATE_OFFSET_CR(sp)
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| 98 |
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| 99 | mfsrr0 r12
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| 100 | stw r12, ISTATE_OFFSET_PC(sp)
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| 101 |
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| 102 | mfsrr1 r12
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| 103 | stw r12, ISTATE_OFFSET_SRR1(sp)
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| 104 |
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| 105 | mflr r12
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| 106 | stw r12, ISTATE_OFFSET_LR(sp)
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| 107 |
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| 108 | mfctr r12
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| 109 | stw r12, ISTATE_OFFSET_CTR(sp)
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| 110 |
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| 111 | mfxer r12
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| 112 | stw r12, ISTATE_OFFSET_XER(sp)
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| 113 |
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| 114 | mfdar r12
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| 115 | stw r12, ISTATE_OFFSET_DAR(sp)
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| 116 |
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| 117 | mfsprg1 r12
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| 118 | stw r12, ISTATE_OFFSET_R12(sp)
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| 119 |
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| 120 | mfsprg2 r12
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| 121 | stw r12, ISTATE_OFFSET_SP(sp)
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| 122 |
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| 123 | li r12, 0
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| 124 | stw r12, ISTATE_OFFSET_LR_FRAME(sp)
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| 125 | stw r12, ISTATE_OFFSET_SP_FRAME(sp)
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| 126 | .endm
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| 127 |
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| 128 | // NOTE: K_UNMAPPED_TEXT_START section starts at 0x100,
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| 129 | // so all the following .org directives are relative to that.
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| 130 | #define ABSOLUTE(x) ((x) - 0x100)
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| 131 |
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| 132 | .org ABSOLUTE(0x100)
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| 133 | SYMBOL(exc_system_reset)
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| 134 | CONTEXT_STORE
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| 135 |
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| 136 | li r3, 0
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| 137 | b jump_to_kernel
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| 138 |
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| 139 | .org ABSOLUTE(0x200)
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| 140 | SYMBOL(exc_machine_check)
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| 141 | CONTEXT_STORE
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| 142 |
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| 143 | li r3, 1
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| 144 | b jump_to_kernel
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| 145 |
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| 146 | .org ABSOLUTE(0x300)
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| 147 | SYMBOL(exc_data_storage)
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| 148 | CONTEXT_STORE
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| 149 |
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| 150 | li r3, 2
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| 151 | b jump_to_kernel
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| 152 |
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| 153 | .org ABSOLUTE(0x400)
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| 154 | SYMBOL(exc_instruction_storage)
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| 155 | CONTEXT_STORE
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| 156 |
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| 157 | li r3, 3
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| 158 | b jump_to_kernel
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| 159 |
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| 160 | .org ABSOLUTE(0x500)
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| 161 | SYMBOL(exc_external)
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| 162 | CONTEXT_STORE
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| 163 |
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| 164 | li r3, 4
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| 165 | b jump_to_kernel
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| 166 |
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| 167 | .org ABSOLUTE(0x600)
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| 168 | SYMBOL(exc_alignment)
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| 169 | CONTEXT_STORE
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| 170 |
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| 171 | li r3, 5
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| 172 | b jump_to_kernel
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| 173 |
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| 174 | .org ABSOLUTE(0x700)
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| 175 | SYMBOL(exc_program)
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| 176 | CONTEXT_STORE
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| 177 |
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| 178 | li r3, 6
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| 179 | b jump_to_kernel
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| 180 |
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| 181 | .org ABSOLUTE(0x800)
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| 182 | SYMBOL(exc_fp_unavailable)
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| 183 | CONTEXT_STORE
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| 184 |
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| 185 | li r3, 7
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| 186 | b jump_to_kernel
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| 187 |
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| 188 | .org ABSOLUTE(0x900)
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| 189 | SYMBOL(exc_decrementer)
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| 190 | CONTEXT_STORE
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| 191 |
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| 192 | li r3, 8
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| 193 | b jump_to_kernel
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| 194 |
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| 195 | .org ABSOLUTE(0xa00)
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| 196 | SYMBOL(exc_reserved0)
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| 197 | CONTEXT_STORE
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| 198 |
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| 199 | li r3, 9
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| 200 | b jump_to_kernel
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| 201 |
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| 202 | .org ABSOLUTE(0xb00)
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| 203 | SYMBOL(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 ABSOLUTE(0xc00)
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| 210 | SYMBOL(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 ABSOLUTE(0xd00)
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| 216 | SYMBOL(exc_trace)
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| 217 | CONTEXT_STORE
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| 218 |
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| 219 | li r3, 12
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| 220 | b jump_to_kernel
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| 221 |
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| 222 | .org ABSOLUTE(0x1000)
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| 223 | SYMBOL(exc_itlb_miss)
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| 224 | CONTEXT_STORE
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| 225 |
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| 226 | li r3, 13
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| 227 | b jump_to_kernel
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| 228 |
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| 229 | .org ABSOLUTE(0x1100)
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| 230 | SYMBOL(exc_dtlb_miss_load)
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| 231 | CONTEXT_STORE
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| 232 |
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| 233 | li r3, 14
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| 234 | b jump_to_kernel
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| 235 |
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| 236 | .org ABSOLUTE(0x1200)
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| 237 | SYMBOL(exc_dtlb_miss_store)
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| 238 | CONTEXT_STORE
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| 239 |
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| 240 | li r3, 15
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| 241 | b jump_to_kernel
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| 242 |
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| 243 | .org ABSOLUTE(0x4000)
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| 244 | jump_to_kernel:
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| 245 | mfsrr1 r5
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| 246 | andi. r5, r5, MSR_PR
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| 247 | bne 1f
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| 248 | # Previous mode was kernel.
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| 249 | # We can construct a proper frame linkage.
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| 250 |
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| 251 | mfsrr0 r12
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| 252 | stw r12, ISTATE_OFFSET_LR_FRAME(sp)
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| 253 | mfsprg2 r12
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| 254 | stw r12, ISTATE_OFFSET_SP_FRAME(sp)
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| 255 | 1:
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| 256 |
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| 257 | lis r12, iret@ha
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| 258 | addi r12, r12, iret@l
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| 259 | mtlr r12
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| 260 |
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| 261 | lis r12, exc_dispatch@ha
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| 262 | addi r12, r12, exc_dispatch@l
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| 263 | mtsrr0 r12
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| 264 |
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| 265 | mfmsr r12
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| 266 | mfsrr1 r5
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| 267 | andi. r5, r5, MSR_FP
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| 268 | or r12, r12, r5 # Propagate MSR_FP from SRR1 to MSR
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| 269 | ori r12, r12, (MSR_IR | MSR_DR)
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| 270 | mtsrr1 r12
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| 271 |
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| 272 | addis sp, sp, 0x8000
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| 273 | mr r4, sp
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| 274 |
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| 275 | rfi
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| 276 |
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| 277 | jump_to_kernel_syscall:
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| 278 | lis r12, syscall_handler@ha
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| 279 | addi r12, r12, syscall_handler@l
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| 280 | mtsrr0 r12
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| 281 |
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| 282 | lis r12, iret_syscall@ha
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| 283 | addi r12, r12, iret_syscall@l
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| 284 | mtlr r12
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| 285 |
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| 286 | mfsrr1 r0
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| 287 | andi. r0, r0, MSR_FP
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| 288 | mfmsr r12
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| 289 | or r12, r12, r0 # Propagate MSR_FP from SRR1 to MSR
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| 290 | ori r12, r12, (MSR_IR | MSR_DR | MSR_EE)
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| 291 | mtsrr1 r12
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| 292 |
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| 293 | addis sp, sp, 0x8000
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| 294 | rfi
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| 295 |
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| 296 | /* Rest is for stack. */
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| 297 |
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| 298 | .org ABSOLUTE(0x8000)
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