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162 | decky | 1 | # |
2 | # Copyright (C) 2005 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 | |||
845 | decky | 29 | #include <arch/asm/regname.h> |
191 | decky | 30 | |
162 | decky | 31 | .text |
32 | |||
1220 | decky | 33 | .global userspace_asm |
1004 | decky | 34 | .global iret |
1277 | decky | 35 | .global iret_syscall |
210 | decky | 36 | .global memsetb |
37 | .global memcpy |
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185 | decky | 38 | |
1220 | decky | 39 | userspace_asm: |
40 | |||
41 | # r3 = uspace_uarg |
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42 | # r4 = stack |
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1267 | decky | 43 | # r5 = entry |
44 | |||
45 | # disable interrupts |
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1220 | decky | 46 | |
47 | mfmsr r31 |
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48 | rlwinm r31, r31, 0, 17, 15 |
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49 | mtmsr r31 |
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50 | |||
51 | # set entry point |
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52 | |||
53 | mtsrr0 r5 |
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54 | |||
55 | # set problem state, enable interrupts |
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56 | |||
1267 | decky | 57 | ori r31, r31, msr_pr |
58 | ori r31, r31, msr_ee |
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1220 | decky | 59 | mtsrr1 r31 |
60 | |||
61 | # set stack |
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62 | |||
63 | mr sp, r4 |
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64 | |||
65 | # jump to userspace |
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66 | |||
67 | rfi |
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68 | |||
1004 | decky | 69 | iret: |
1277 | decky | 70 | |
71 | # disable interrupts |
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72 | |||
73 | mfmsr r31 |
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74 | rlwinm r31, r31, 0, 17, 15 |
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75 | mtmsr r31 |
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76 | |||
1004 | decky | 77 | lwz r0, 0(sp) |
78 | lwz r2, 4(sp) |
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79 | lwz r3, 8(sp) |
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80 | lwz r4, 12(sp) |
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81 | lwz r5, 16(sp) |
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82 | lwz r6, 20(sp) |
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83 | lwz r7, 24(sp) |
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84 | lwz r8, 28(sp) |
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85 | lwz r9, 32(sp) |
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86 | lwz r10, 36(sp) |
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87 | lwz r11, 40(sp) |
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1267 | decky | 88 | lwz r13, 44(sp) |
89 | lwz r14, 48(sp) |
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90 | lwz r15, 52(sp) |
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91 | lwz r16, 56(sp) |
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92 | lwz r17, 60(sp) |
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93 | lwz r18, 64(sp) |
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94 | lwz r19, 68(sp) |
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95 | lwz r20, 72(sp) |
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96 | lwz r21, 76(sp) |
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97 | lwz r22, 80(sp) |
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98 | lwz r23, 84(sp) |
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99 | lwz r24, 88(sp) |
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100 | lwz r25, 92(sp) |
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101 | lwz r26, 96(sp) |
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102 | lwz r27, 100(sp) |
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103 | lwz r28, 104(sp) |
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104 | lwz r29, 108(sp) |
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105 | lwz r30, 112(sp) |
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106 | lwz r31, 116(sp) |
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1004 | decky | 107 | |
1267 | decky | 108 | lwz r12, 120(sp) |
1277 | decky | 109 | mtcr r12 |
110 | |||
111 | lwz r12, 124(sp) |
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1267 | decky | 112 | mtsrr0 r12 |
1004 | decky | 113 | |
1277 | decky | 114 | lwz r12, 128(sp) |
1267 | decky | 115 | mtsrr1 r12 |
116 | |||
1277 | decky | 117 | lwz r12, 132(sp) |
1267 | decky | 118 | mtlr r12 |
119 | |||
1277 | decky | 120 | lwz r12, 136(sp) |
121 | mtctr r12 |
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122 | |||
123 | lwz r12, 140(sp) |
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124 | mtxer r12 |
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125 | |||
126 | lwz r12, 144(sp) |
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127 | lwz sp, 148(sp) |
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128 | |||
129 | rfi |
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130 | |||
131 | iret_syscall: |
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132 | |||
133 | # disable interrupts |
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134 | |||
135 | mfmsr r31 |
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136 | rlwinm r31, r31, 0, 17, 15 |
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137 | mtmsr r31 |
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138 | |||
139 | lwz r0, 0(sp) |
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140 | lwz r2, 4(sp) |
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141 | lwz r4, 12(sp) |
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142 | lwz r5, 16(sp) |
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143 | lwz r6, 20(sp) |
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144 | lwz r7, 24(sp) |
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145 | lwz r8, 28(sp) |
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146 | lwz r9, 32(sp) |
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147 | lwz r10, 36(sp) |
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148 | lwz r11, 40(sp) |
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149 | lwz r13, 44(sp) |
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150 | lwz r14, 48(sp) |
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151 | lwz r15, 52(sp) |
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152 | lwz r16, 56(sp) |
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153 | lwz r17, 60(sp) |
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154 | lwz r18, 64(sp) |
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155 | lwz r19, 68(sp) |
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156 | lwz r20, 72(sp) |
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157 | lwz r21, 76(sp) |
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158 | lwz r22, 80(sp) |
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159 | lwz r23, 84(sp) |
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160 | lwz r24, 88(sp) |
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161 | lwz r25, 92(sp) |
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162 | lwz r26, 96(sp) |
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163 | lwz r27, 100(sp) |
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164 | lwz r28, 104(sp) |
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165 | lwz r29, 108(sp) |
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166 | lwz r30, 112(sp) |
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167 | lwz r31, 116(sp) |
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168 | |||
169 | lwz r12, 120(sp) |
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1267 | decky | 170 | mtcr r12 |
171 | |||
1277 | decky | 172 | lwz r12, 124(sp) |
173 | mtsrr0 r12 |
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174 | |||
175 | lwz r12, 128(sp) |
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176 | mtsrr1 r12 |
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177 | |||
178 | lwz r12, 132(sp) |
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179 | mtlr r12 |
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180 | |||
1267 | decky | 181 | lwz r12, 136(sp) |
182 | mtctr r12 |
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183 | |||
184 | lwz r12, 140(sp) |
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185 | mtxer r12 |
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1277 | decky | 186 | |
187 | lwz r12, 144(sp) |
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188 | lwz sp, 148(sp) |
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1267 | decky | 189 | |
1004 | decky | 190 | rfi |
191 | |||
210 | decky | 192 | memsetb: |
193 | rlwimi r5, r5, 8, 16, 23 |
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194 | rlwimi r5, r5, 16, 0, 15 |
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195 | |||
196 | addi r14, r3, -4 |
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197 | |||
198 | cmplwi 0, r4, 4 |
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199 | blt 7f |
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200 | |||
201 | stwu r5, 4(r14) |
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202 | beqlr |
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203 | |||
204 | andi. r15, r14, 3 |
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205 | add r4, r15, r4 |
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206 | subf r14, r15, r14 |
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207 | srwi r15, r4, 2 |
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208 | mtctr r15 |
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209 | |||
210 | bdz 6f |
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211 | |||
212 | 1: |
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213 | stwu r5, 4(r14) |
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214 | bdnz 1b |
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215 | |||
216 | 6: |
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217 | |||
218 | andi. r4, r4, 3 |
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219 | |||
220 | 7: |
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221 | |||
222 | cmpwi 0, r4, 0 |
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223 | beqlr |
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224 | |||
225 | mtctr r4 |
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226 | addi r6, r6, 3 |
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227 | |||
228 | 8: |
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229 | |||
230 | stbu r5, 1(r14) |
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231 | bdnz 8b |
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232 | |||
233 | blr |
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234 | |||
235 | memcpy: |
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860 | decky | 236 | srwi. r7, r5, 3 |
237 | addi r6, r3, -4 |
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238 | addi r4, r4, -4 |
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239 | beq 2f |
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240 | |||
241 | andi. r0, r6, 3 |
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242 | mtctr r7 |
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243 | bne 5f |
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244 | |||
245 | 1: |
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246 | |||
247 | lwz r7, 4(r4) |
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248 | lwzu r8, 8(r4) |
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249 | stw r7, 4(r6) |
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250 | stwu r8, 8(r6) |
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251 | bdnz 1b |
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252 | |||
253 | andi. r5, r5, 7 |
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254 | |||
255 | 2: |
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256 | |||
257 | cmplwi 0, r5, 4 |
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258 | blt 3f |
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259 | |||
260 | lwzu r0, 4(r4) |
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261 | addi r5, r5, -4 |
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262 | stwu r0, 4(r6) |
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263 | |||
264 | 3: |
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265 | |||
266 | cmpwi 0, r5, 0 |
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267 | beqlr |
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268 | mtctr r5 |
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269 | addi r4, r4, 3 |
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270 | addi r6, r6, 3 |
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271 | |||
272 | 4: |
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273 | |||
274 | lbzu r0, 1(r4) |
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275 | stbu r0, 1(r6) |
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276 | bdnz 4b |
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210 | decky | 277 | blr |
860 | decky | 278 | |
279 | 5: |
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280 | |||
281 | subfic r0, r0, 4 |
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282 | mtctr r0 |
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283 | |||
284 | 6: |
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285 | |||
286 | lbz r7, 4(r4) |
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287 | addi r4, r4, 1 |
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288 | stb r7, 4(r6) |
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289 | addi r6, r6, 1 |
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290 | bdnz 6b |
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291 | subf r5, r0, r5 |
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292 | rlwinm. r7, r5, 32-3, 3, 31 |
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293 | beq 2b |
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294 | mtctr r7 |
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295 | b 1b |