1 | /* |
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2 | * hal_witch.S - CPU context switch function for TSAR-MIPS32 |
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3 | * |
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4 | * Author Alain Greiner (2016,2017,2018,2019) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH.is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH.is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH.; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | .section .switch , "ax" , @progbits |
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25 | |
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26 | .global hal_do_cpu_switch |
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27 | .global hal_do_cpu_save |
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28 | .global hal_do_cpu_restore |
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29 | |
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30 | .set noat |
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31 | .set noreorder |
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32 | |
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33 | #--------------------------------------------------------------------------------- |
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34 | # The hal_do_cpu_switch() function makes the following assumptions: |
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35 | # - register $4 contains a pointer on the old thread context. |
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36 | # - register $5 contains a pointer on the new thread context. |
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37 | #--------------------------------------------------------------------------------- |
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38 | hal_do_cpu_switch: |
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39 | |
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40 | /* save old thread context */ |
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41 | |
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42 | move $26, $4 /* $26 <= ctx_old */ |
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43 | |
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44 | mfc0 $27, $14 |
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45 | sw $27, 0*4($26) /* save c0_epc to slot 0 */ |
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46 | |
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47 | sw $1, 1*4($26) |
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48 | sw $2, 2*4($26) |
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49 | sw $3, 3*4($26) |
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50 | sw $4, 4*4($26) |
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51 | sw $5, 5*4($26) |
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52 | sw $6, 6*4($26) |
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53 | sw $7, 7*4($26) |
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54 | sw $8, 8*4($26) |
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55 | sw $9, 9*4($26) |
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56 | sw $10, 10*4($26) |
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57 | sw $11, 11*4($26) |
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58 | sw $12, 12*4($26) |
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59 | sw $13, 13*4($26) |
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60 | sw $14, 14*4($26) |
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61 | sw $15, 15*4($26) |
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62 | sw $16, 16*4($26) |
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63 | sw $17, 17*4($26) |
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64 | sw $18, 18*4($26) |
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65 | sw $19, 19*4($26) |
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66 | sw $20, 20*4($26) |
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67 | sw $21, 21*4($26) |
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68 | sw $22, 22*4($26) |
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69 | sw $23, 23*4($26) |
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70 | sw $24, 24*4($26) |
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71 | sw $25, 25*4($26) |
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72 | |
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73 | mfhi $27 |
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74 | sw $27, 26*4($26) /* save hi to slot 26 */ |
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75 | mflo $27 |
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76 | sw $27, 27*4($26) /* save lo to slot 27 */ |
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77 | |
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78 | sw $28, 28*4($26) |
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79 | sw $29, 29*4($26) |
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80 | sw $30, 30*4($26) |
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81 | sw $31, 31*4($26) |
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82 | |
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83 | mfc0 $27, $12 |
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84 | sw $27, 34*4($26) /* save c0_sr to slot 34 */ |
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85 | mfc0 $27, $4, 2 |
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86 | sw $27, 35*4($26) /* save c0_th to slot 35 */ |
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87 | |
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88 | mfc2 $27, $0 |
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89 | sw $27, 32*4($26) /* save c2_ptpr to slot 32 */ |
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90 | mfc2 $27, $1 |
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91 | sw $27, 33*4($26) /* save c2_mode to slot 33 */ |
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92 | |
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93 | sync |
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94 | |
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95 | /* restore new thread context */ |
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96 | |
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97 | move $26, $5 /* $26 <= ctx_new */ |
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98 | |
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99 | lw $27, 0*4($26) |
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100 | mtc0 $27, $14 /* restore C0_epc from slot 0 */ |
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101 | |
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102 | lw $1, 1*4($26) |
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103 | lw $2, 2*4($26) |
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104 | lw $3, 3*4($26) |
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105 | lw $4, 4*4($26) |
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106 | lw $5, 5*4($26) |
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107 | lw $6, 6*4($26) |
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108 | lw $7, 7*4($26) |
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109 | lw $8, 8*4($26) |
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110 | lw $9, 9*4($26) |
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111 | lw $10, 10*4($26) |
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112 | lw $11, 11*4($26) |
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113 | lw $12, 12*4($26) |
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114 | lw $13, 13*4($26) |
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115 | lw $14, 14*4($26) |
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116 | lw $15, 15*4($26) |
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117 | lw $16, 16*4($26) |
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118 | lw $17, 17*4($26) |
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119 | lw $18, 18*4($26) |
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120 | lw $19, 19*4($26) |
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121 | lw $20, 20*4($26) |
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122 | lw $21, 21*4($26) |
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123 | lw $22, 22*4($26) |
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124 | lw $23, 23*4($26) |
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125 | lw $24, 24*4($26) |
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126 | lw $25, 25*4($26) |
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127 | |
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128 | lw $27, 26*4($26) |
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129 | mthi $27 /* restore hi from slot 26 */ |
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130 | lw $27, 27*4($26) |
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131 | mtlo $27 /* restore lo from slot 27 */ |
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132 | |
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133 | lw $28, 28*4($26) |
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134 | lw $29, 29*4($26) |
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135 | lw $30, 30*4($26) |
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136 | lw $31, 31*4($26) /* restore ra from slot 31 */ |
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137 | |
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138 | lw $27, 32*4($26) |
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139 | mtc2 $27, $0 /* restore c2_ptpr from slot 32 */ |
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140 | |
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141 | lw $27, 35*4($26) |
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142 | mtc0 $27, $4, 2 /* restore c0_th from slot 35 */ |
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143 | |
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144 | lw $27, 33*4($26) |
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145 | lw $26, 34*4($26) |
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146 | |
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147 | mtc2 $27, $1 /* restore c2_mode from slot 33 */ |
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148 | mtc0 $26, $12 /* restore c0_sr from slot 34 */ |
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149 | |
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150 | jr $31 /* return to caller */ |
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151 | nop |
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152 | |
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153 | #--------------------------------------------------------------------------------- |
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154 | # The hal_do_cpu_save()function makes the following assumption: |
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155 | # - register $4 contains a pointer on the target thread context. |
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156 | #--------------------------------------------------------------------------------- |
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157 | hal_do_cpu_save: |
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158 | |
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159 | move $26, $4 /* $26 <= &context */ |
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160 | |
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161 | mfc0 $27, $14 |
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162 | sw $27, 0*4($26) /* save c0_epc to slot 0 */ |
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163 | |
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164 | sw $1, 1*4($26) |
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165 | sw $2, 2*4($26) |
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166 | sw $3, 3*4($26) |
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167 | sw $4, 4*4($26) |
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168 | sw $5, 5*4($26) |
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169 | sw $6, 6*4($26) |
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170 | sw $7, 7*4($26) |
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171 | sw $8, 8*4($26) |
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172 | sw $9, 9*4($26) |
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173 | sw $10, 10*4($26) |
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174 | sw $11, 11*4($26) |
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175 | sw $12, 12*4($26) |
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176 | sw $13, 13*4($26) |
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177 | sw $14, 14*4($26) |
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178 | sw $15, 15*4($26) |
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179 | sw $16, 16*4($26) |
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180 | sw $17, 17*4($26) |
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181 | sw $18, 18*4($26) |
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182 | sw $19, 19*4($26) |
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183 | sw $20, 20*4($26) |
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184 | sw $21, 21*4($26) |
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185 | sw $22, 22*4($26) |
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186 | sw $23, 23*4($26) |
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187 | sw $24, 24*4($26) |
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188 | sw $25, 25*4($26) |
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189 | |
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190 | mfhi $27 |
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191 | sw $27, 26*4($26) /* save hi to slot 26 */ |
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192 | mflo $27 |
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193 | sw $27, 27*4($26) /* save lo to slot 27 */ |
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194 | |
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195 | sw $28, 28*4($26) /* save gp to slot 28 */ |
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196 | sw $29, 29*4($26) /* save sp to slot 29 */ |
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197 | sw $30, 30*4($26) /* save s8 to slot 30 */ |
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198 | sw $31, 31*4($26) /* save ra to slot 31 */ |
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199 | |
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200 | mfc2 $27, $0 |
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201 | sw $27, 32*4($26) /* save c2_ptpr to slot 32 */ |
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202 | mfc2 $27, $1 |
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203 | sw $27, 33*4($26) /* save c2_mode to slot 33 */ |
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204 | mfc0 $27, $12 |
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205 | sw $27, 34*4($26) /* save c0_sr to slot 34 */ |
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206 | mfc0 $27, $4, 2 |
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207 | sw $27, 35*4($26) /* save c0_th to slot 35 */ |
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208 | |
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209 | sync |
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210 | |
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211 | jr $31 /* return to caller */ |
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212 | nop |
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213 | |
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214 | #--------------------------------------------------------------------------------- |
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215 | # The hal_do_cpu_restore()function makes the following assumption: |
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216 | # - register $4 contains a pointer on the target thread context. |
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217 | #--------------------------------------------------------------------------------- |
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218 | hal_do_cpu_restore: |
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219 | |
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220 | move $26, $4 /* $26 <= &context */ |
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221 | |
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222 | lw $27, 0*4($26) |
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223 | mtc0 $27, $14 /* restore C0_epc from slot 0 */ |
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224 | |
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225 | lw $1, 1*4($26) |
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226 | lw $2, 2*4($26) |
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227 | lw $3, 3*4($26) |
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228 | lw $4, 4*4($26) |
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229 | lw $5, 5*4($26) |
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230 | lw $6, 6*4($26) |
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231 | lw $7, 7*4($26) |
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232 | lw $8, 8*4($26) |
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233 | lw $9, 9*4($26) |
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234 | lw $10, 10*4($26) |
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235 | lw $11, 11*4($26) |
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236 | lw $12, 12*4($26) |
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237 | lw $13, 13*4($26) |
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238 | lw $14, 14*4($26) |
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239 | lw $15, 15*4($26) |
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240 | lw $16, 16*4($26) |
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241 | lw $17, 17*4($26) |
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242 | lw $18, 18*4($26) |
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243 | lw $19, 19*4($26) |
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244 | lw $20, 20*4($26) |
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245 | lw $21, 21*4($26) |
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246 | lw $22, 22*4($26) |
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247 | lw $23, 23*4($26) |
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248 | lw $24, 24*4($26) |
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249 | lw $25, 25*4($26) |
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250 | |
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251 | lw $27, 26*4($26) |
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252 | mthi $27 /* restore hi from slot 26 */ |
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253 | lw $27, 27*4($26) |
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254 | mtlo $27 /* restore lo from slot 27 */ |
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255 | |
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256 | lw $28, 28*4($26) |
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257 | lw $29, 29*4($26) |
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258 | lw $30, 30*4($26) |
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259 | lw $31, 31*4($26) /* restore ra from slot 31 */ |
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260 | |
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261 | lw $27, 32*4($26) |
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262 | mtc2 $27, $0 /* restore c2_ptpr from slot 32 */ |
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263 | |
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264 | lw $27, 35*4($26) |
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265 | mtc0 $27, $4, 2 /* restore c0_th from slot 35 */ |
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266 | |
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267 | lw $27, 33*4($26) |
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268 | lw $26, 34*4($26) |
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269 | |
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270 | mtc2 $27, $1 /* restore c2_mode from slot 33 */ |
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271 | mtc0 $26, $12 /* restore c0_sr from slot 34 */ |
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272 | |
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273 | jr $31 /* return to caller */ |
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274 | nop |
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275 | |
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276 | .set reorder |
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277 | .set at |
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278 | |
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