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| 1125 | jermar | 1 | # |
| 2 | # Copyright (C) 2005 Jakub Jermar |
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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 | .text |
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| 30 | |||
| 31 | .global context_save |
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| 32 | .global context_restore |
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| 33 | |||
| 34 | context_save: |
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| 35 | alloc loc0 = ar.pfs, 1, 8, 0, 0 |
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| 36 | mov loc1 = ar.unat ;; |
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| 37 | /* loc2 */ |
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| 38 | mov loc3 = ar.rsc |
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| 39 | |||
| 40 | .auto |
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| 41 | |||
| 42 | /* |
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| 43 | * Flush dirty registers to backing store. |
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| 44 | * After this ar.bsp and ar.bspstore are equal. |
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| 45 | */ |
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| 46 | flushrs |
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| 47 | mov loc4 = ar.bsp |
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| 48 | |||
| 49 | /* |
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| 50 | * Put RSE to enforced lazy mode. |
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| 51 | * So that ar.rnat can be read. |
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| 52 | */ |
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| 53 | and loc5 = ~3, loc3 |
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| 54 | mov ar.rsc = loc5 |
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| 55 | mov loc5 = ar.rnat |
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| 56 | |||
| 57 | .explicit |
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| 58 | |||
| 59 | mov loc6 = ar.lc |
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| 60 | |||
| 61 | /* |
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| 62 | * Save application registers |
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| 63 | */ |
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| 64 | st8 [in0] = loc0, 8 ;; /* save ar.pfs */ |
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| 65 | st8 [in0] = loc1, 8 ;; /* save ar.unat (caller) */ |
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| 66 | mov loc2 = in0 ;; |
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| 67 | add in0 = 8, in0 ;; /* skip ar.unat (callee) */ |
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| 68 | st8 [in0] = loc3, 8 ;; /* save ar.rsc */ |
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| 69 | st8 [in0] = loc4, 8 ;; /* save ar.bsp */ |
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| 70 | st8 [in0] = loc5, 8 ;; /* save ar.rnat */ |
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| 71 | st8 [in0] = loc6, 8 ;; /* save ar.lc */ |
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| 72 | |||
| 73 | /* |
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| 74 | * Save general registers including NaT bits |
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| 75 | */ |
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| 76 | st8.spill [in0] = r1, 8 ;; |
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| 77 | st8.spill [in0] = r4, 8 ;; |
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| 78 | st8.spill [in0] = r5, 8 ;; |
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| 79 | st8.spill [in0] = r6, 8 ;; |
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| 80 | st8.spill [in0] = r7, 8 ;; |
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| 81 | st8.spill [in0] = r12, 8 ;; /* save sp */ |
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| 82 | st8.spill [in0] = r13, 8 ;; /* save tp */ |
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| 83 | |||
| 84 | mov loc3 = ar.unat ;; |
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| 85 | st8 [loc2] = loc3 /* save ar.unat (callee) */ |
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| 86 | |||
| 87 | /* |
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| 88 | * Save branch registers |
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| 89 | */ |
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| 90 | mov loc2 = b0 ;; |
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| 91 | st8 [in0] = loc2, 8 /* save pc */ |
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| 92 | mov loc3 = b1 ;; |
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| 93 | st8 [in0] = loc3, 8 |
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| 94 | mov loc4 = b2 ;; |
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| 95 | st8 [in0] = loc4, 8 |
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| 96 | mov loc5 = b3 ;; |
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| 97 | st8 [in0] = loc5, 8 |
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| 98 | mov loc6 = b4 ;; |
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| 99 | st8 [in0] = loc6, 8 |
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| 100 | mov loc7 = b5 ;; |
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| 101 | st8 [in0] = loc7, 8 |
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| 102 | |||
| 103 | /* |
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| 104 | * Save predicate registers |
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| 105 | */ |
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| 106 | mov loc2 = pr ;; |
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| 107 | st8 [in0] = loc2, 8 ;; |
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| 108 | |||
| 109 | mov ar.unat = loc1 |
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| 110 | |||
| 111 | add r8 = r0, r0, 1 /* context_save returns 1 */ |
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| 112 | br.ret.sptk.many b0 |
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| 113 | |||
| 114 | context_restore: |
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| 115 | alloc loc0 = ar.pfs, 1, 9, 0, 0 ;; |
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| 116 | |||
| 117 | ld8 loc0 = [in0], 8 ;; /* load ar.pfs */ |
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| 118 | ld8 loc1 = [in0], 8 ;; /* load ar.unat (caller) */ |
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| 119 | ld8 loc2 = [in0], 8 ;; /* load ar.unat (callee) */ |
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| 120 | ld8 loc3 = [in0], 8 ;; /* load ar.rsc */ |
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| 121 | ld8 loc4 = [in0], 8 ;; /* load ar.bsp */ |
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| 122 | ld8 loc5 = [in0], 8 ;; /* load ar.rnat */ |
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| 123 | ld8 loc6 = [in0], 8 ;; /* load ar.lc */ |
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| 124 | |||
| 125 | .auto |
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| 126 | |||
| 127 | /* |
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| 128 | * Invalidate the ALAT |
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| 129 | */ |
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| 130 | invala |
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| 131 | |||
| 132 | /* |
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| 133 | * Put RSE to enforced lazy mode. |
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| 134 | * So that ar.bspstore and ar.rnat can be written. |
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| 135 | */ |
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| 136 | movl loc8 = ~3 |
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| 137 | and loc8 = loc3, loc8 |
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| 138 | mov ar.rsc = loc8 |
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| 139 | |||
| 140 | /* |
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| 141 | * Flush dirty registers to backing store. |
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| 142 | * We do this because we want the following move |
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| 143 | * to ar.bspstore to assign the same value to ar.bsp. |
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| 144 | */ |
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| 145 | flushrs |
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| 146 | |||
| 147 | /* |
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| 148 | * Restore application registers |
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| 149 | */ |
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| 150 | mov ar.bspstore = loc4 /* rse.bspload = ar.bsp = ar.bspstore = loc4 */ |
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| 151 | mov ar.rnat = loc5 |
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| 152 | mov ar.pfs = loc0 |
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| 153 | mov ar.rsc = loc3 |
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| 154 | |||
| 155 | .explicit |
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| 156 | |||
| 157 | mov ar.unat = loc2 ;; |
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| 158 | mov ar.lc = loc6 |
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| 159 | |||
| 160 | /* |
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| 161 | * Restore general registers including NaT bits |
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| 162 | */ |
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| 163 | ld8.fill r1 = [in0], 8 ;; |
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| 164 | ld8.fill r4 = [in0], 8 ;; |
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| 165 | ld8.fill r5 = [in0], 8 ;; |
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| 166 | ld8.fill r6 = [in0], 8 ;; |
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| 167 | ld8.fill r7 = [in0], 8 ;; |
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| 168 | ld8.fill r12 = [in0], 8 ;; /* restore sp */ |
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| 169 | ld8.fill r13 = [in0], 8 ;; |
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| 170 | |||
| 171 | /* |
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| 172 | * Restore branch registers |
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| 173 | */ |
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| 174 | ld8 loc2 = [in0], 8 ;; /* restore pc */ |
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| 175 | mov b0 = loc2 |
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| 176 | ld8 loc3 = [in0], 8 ;; |
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| 177 | mov b1 = loc3 |
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| 178 | ld8 loc4 = [in0], 8 ;; |
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| 179 | mov b2 = loc4 |
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| 180 | ld8 loc5 = [in0], 8 ;; |
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| 181 | mov b3 = loc5 |
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| 182 | ld8 loc6 = [in0], 8 ;; |
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| 183 | mov b4 = loc6 |
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| 184 | ld8 loc7 = [in0], 8 ;; |
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| 185 | mov b5 = loc7 |
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| 186 | |||
| 187 | /* |
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| 188 | * Restore predicate registers |
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| 189 | */ |
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| 190 | ld8 loc2 = [in0], 8 ;; |
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| 191 | mov pr = loc2, ~0 |
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| 192 | |||
| 193 | mov ar.unat = loc1 |
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| 194 | |||
| 195 | mov r8 = r0 /* context_restore returns 0 */ |
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| 196 | br.ret.sptk.many b0 |