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1160 | decky | 1 | # |
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 | |||
29 | #include <arch/asm/regname.h> |
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30 | #include <arch/mm/page.h> |
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31 | |||
32 | .section K_UNMAPPED_TEXT_START, "ax" |
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33 | |||
1398 | decky | 34 | .macro CONTEXT_STORE |
35 | |||
36 | # save R12 in SPRG1, backup CR in R12 |
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37 | # save SP in SPRG2 |
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38 | |||
39 | mtsprg1 r12 |
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40 | mfcr r12 |
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41 | mtsprg2 sp |
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42 | |||
43 | # check whether SP is in kernel |
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44 | |||
45 | andis. sp, sp, 0x8000 |
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46 | bne 1f |
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47 | |||
48 | # stack is in user-space |
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49 | |||
50 | mfsprg0 sp |
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51 | |||
52 | b 2f |
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53 | |||
54 | 1: |
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55 | |||
56 | # stack is in kernel |
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57 | |||
58 | mfsprg2 sp |
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59 | subis sp, sp, 0x8000 |
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60 | |||
61 | 2: |
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62 | |||
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 | |||
95 | stw r12, 128(sp) |
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96 | |||
97 | mfsrr0 r12 |
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98 | stw r12, 132(sp) |
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99 | |||
100 | mfsrr1 r12 |
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101 | stw r12, 136(sp) |
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102 | |||
103 | mflr r12 |
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104 | stw r12, 140(sp) |
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105 | |||
106 | mfctr r12 |
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107 | stw r12, 144(sp) |
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108 | |||
109 | mfxer r12 |
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110 | stw r12, 148(sp) |
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111 | |||
112 | mfsprg1 r12 |
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113 | stw r12, 152(sp) |
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114 | |||
115 | mfsprg2 r12 |
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116 | stw r12, 156(sp) |
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117 | .endm |
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118 | |||
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 | |||
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 | |||
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 | |||
133 | rfi |
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134 | |||
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 | |||
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 | |||
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 | |||
148 | addis sp, sp, 0x8000 |
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149 | rfi |
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150 | |||
1160 | decky | 151 | .org 0x100 |
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 | |||
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 | |||
161 | .org 0x300 |
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162 | .global exc_data_storage |
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163 | exc_data_storage: |
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1398 | decky | 164 | CONTEXT_STORE |
165 | |||
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 | |||
170 | li r3, 1 |
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171 | b jump_to_kernel |
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1160 | decky | 172 | |
173 | .org 0x400 |
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174 | .global exc_instruction_storage |
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175 | exc_instruction_storage: |
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1398 | decky | 176 | CONTEXT_STORE |
177 | |||
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 | |||
182 | li r3, 0 |
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183 | b jump_to_kernel |
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1160 | decky | 184 | |
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 | |||
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 | |||
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 | |||
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 | |||
205 | .org 0x900 |
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206 | .global exc_decrementer |
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207 | exc_decrementer: |
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1398 | decky | 208 | CONTEXT_STORE |
1160 | decky | 209 | |
1398 | decky | 210 | lis r12, exc_dispatch@ha |
211 | addi r12, r12, exc_dispatch@l |
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212 | mtsrr0 r12 |
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1160 | decky | 213 | |
214 | li r3, 10 |
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1398 | decky | 215 | b jump_to_kernel |
1160 | decky | 216 | |
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 | |||
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 | |||
227 | .org 0xc00 |
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228 | .global exc_syscall |
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229 | exc_syscall: |
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1398 | decky | 230 | CONTEXT_STORE |
231 | |||
232 | b jump_to_kernel_syscall |
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1160 | decky | 233 | |
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 |