1 | ; /* @(#)register.s 1.1 96/05/23 08:57:34, TEI */ |
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2 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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3 | ; Register Definitions and Usage Conventions |
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4 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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5 | ; /* $Id$ */ |
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6 | ; |
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7 | |
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8 | ;* File information and includes. |
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9 | |
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10 | .file "c_register.s" |
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11 | .ident "@(#)register.s 1.1 96/05/23 08:57:34, TEI\n" |
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12 | |
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13 | ; Basic guidelines for register distribution and usage are derived from |
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14 | ; the AMD application notes. It would be best to stick with the conventions |
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15 | ; laid out by AMD. |
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16 | ; Application Note: Context Switching with 29000 Processor By Daniel Mann. |
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17 | |
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18 | ; |
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19 | ;************************************************************************* |
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20 | ; |
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21 | |
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22 | ; |
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23 | ; Rule 1: |
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24 | ; Gr1 is used as a pointer to the register stack |
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25 | ; Lr1 is used as frame pointer |
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26 | ; |
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27 | |
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28 | .reg regsp, gr1 ; Register Stack Pointer |
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29 | .reg fp, lr1 ; frame pointer |
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30 | |
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31 | .equ Rrsp, ®sp |
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32 | .equ Rfp, &fp |
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33 | |
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34 | .global Rrsp, Rfp |
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35 | |
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36 | ; |
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37 | ;************************************************************************* |
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38 | ; |
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39 | |
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40 | ; |
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41 | ; Gr2-Gr63 are not implemented in silicon |
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42 | ; |
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43 | |
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44 | ; |
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45 | ;************************************************************************* |
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46 | ; |
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47 | |
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48 | ; |
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49 | ; Rule 2: |
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50 | ; The registers GR64-GR95 are dedicated for operating system use. |
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51 | ; |
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52 | |
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53 | ; The register range GR64-GR95 i.e 32 Registers is furthur sub-divided as |
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54 | ; follows... |
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55 | ; gr64-gr67 interrupt handlers. |
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56 | ; gr68-gr71 OS temporaries I |
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57 | ; gr72-gr79 OS temporaries II |
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58 | ; gr80-gr95 OS statics. Dedicated throughout the operation of a program. |
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59 | |
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60 | |
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61 | ; |
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62 | ; 32 Registers for Operating System Use. |
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63 | ; |
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64 | |
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65 | ; |
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66 | ; Assigning Names to Interrupt Handlers Registers. |
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67 | ; |
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68 | |
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69 | .reg OSint0, gr64 |
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70 | .reg OSint1, gr65 |
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71 | .reg OSint2, gr66 |
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72 | .reg OSint3, gr67 |
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73 | |
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74 | .equ ROSint0, &OSint0 |
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75 | .equ ROSint1, &OSint1 |
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76 | .equ ROSint2, &OSint2 |
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77 | .equ ROSint3, &OSint3 |
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78 | |
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79 | .global ROSint0, ROSint1, ROSint2, ROSint3 |
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80 | |
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81 | .reg TrapReg, gr64 ; trap register |
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82 | .reg trapreg, gr64 ; trapreg |
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83 | |
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84 | .equ RTrapReg, &TrapReg |
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85 | .equ Rtrapreg, &trapreg |
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86 | |
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87 | .global RTrapReg, Rtrapreg |
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88 | |
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89 | |
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90 | ; |
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91 | ; Assigning Names to Scratch/Temporary Registers. |
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92 | ; |
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93 | |
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94 | .reg OStmp0, gr68 |
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95 | .reg OStmp1, gr69 |
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96 | .reg OStmp2, gr70 |
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97 | .reg OStmp3, gr71 |
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98 | |
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99 | .reg OStmp4, gr72 |
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100 | .reg OStmp5, gr73 |
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101 | .reg OStmp6, gr74 |
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102 | .reg OStmp7, gr75 |
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103 | |
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104 | .reg OStmp8, gr76 |
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105 | .reg OStmp9, gr77 |
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106 | .reg OStmp10, gr78 |
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107 | .reg OStmp11, gr79 |
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108 | |
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109 | .equ ROStmp0, &OStmp0 |
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110 | .equ ROStmp1, &OStmp1 |
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111 | .equ ROStmp2, &OStmp2 |
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112 | .equ ROStmp3, &OStmp3 |
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113 | |
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114 | .equ ROStmp4, &OStmp4 |
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115 | .equ ROStmp5, &OStmp5 |
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116 | .equ ROStmp6, &OStmp6 |
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117 | .equ ROStmp7, &OStmp7 |
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118 | |
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119 | .equ ROStmp8, &OStmp8 |
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120 | .equ ROStmp9, &OStmp9 |
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121 | .equ ROStmp10, &OStmp10 |
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122 | .equ ROStmp11, &OStmp11 |
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123 | |
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124 | .global ROStmp0, ROStmp1, ROStmp2, ROStmp3 |
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125 | .global ROStmp4, ROStmp5, ROStmp6, ROStmp7 |
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126 | .global ROStmp8, ROStmp9, ROStmp10, ROStmp11 |
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127 | |
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128 | ; |
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129 | ; Assigning Names to Statics/Permanent Registers. |
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130 | ; |
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131 | |
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132 | .reg OSsta0, gr80 ; Spill Address Register |
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133 | .reg OSsta1, gr81 ; Fill Address Register |
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134 | .reg OSsta2, gr82 ; Signal Address Register |
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135 | .reg OSsta3, gr83 ; pcb Register |
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136 | |
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137 | .reg OSsta4, gr84 ; |
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138 | .reg OSsta5, gr85 ; |
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139 | .reg OSsta6, gr86 ; |
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140 | .reg OSsta7, gr87 ; |
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141 | |
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142 | .reg OSsta8, gr88 ; |
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143 | .reg OSsta9, gr89 ; |
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144 | .reg OSsta10, gr90 ; |
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145 | .reg OSsta11, gr91 ; |
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146 | |
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147 | .reg OSsta12, gr92 ; |
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148 | .reg OSsta13, gr93 ; |
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149 | .reg OSsta14, gr94 ; |
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150 | .reg OSsta15, gr95 ; |
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151 | |
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152 | ; |
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153 | ; Round 2 of Name Assignments |
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154 | ; |
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155 | |
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156 | ; |
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157 | ; Assignment of Specific Use oriented names to statics. |
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158 | ; |
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159 | .reg SpillAddrReg, gr80 |
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160 | .reg FillAddrReg, gr81 |
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161 | .reg SignalAddrReg, gr82 |
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162 | .reg pcb, gr83 |
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163 | |
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164 | .reg etx, gr80 |
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165 | .reg ety, gr81 |
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166 | .reg etz, gr82 |
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167 | .reg etc, gr83 |
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168 | |
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169 | ;* |
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170 | |
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171 | .reg TimerExt, gr84 |
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172 | .reg TimerUtil, gr85 |
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173 | |
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174 | ;* |
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175 | |
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176 | .reg LEDReg, gr86 |
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177 | .reg ERRReg, gr87 |
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178 | |
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179 | .reg eta, gr86 |
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180 | .reg etb, gr87 |
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181 | |
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182 | ;* |
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183 | |
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184 | |
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185 | ;* The following registers are used by switching code |
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186 | |
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187 | .reg et0, gr88 |
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188 | .reg et1, gr89 |
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189 | .reg et2, gr90 |
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190 | .reg et3, gr91 |
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191 | |
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192 | .reg et4, gr92 |
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193 | .reg et5, gr93 |
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194 | .reg et6, gr94 |
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195 | .reg et7, gr95 |
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196 | |
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197 | |
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198 | ; The floating point trap handlers need a few static registers |
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199 | |
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200 | .reg FPStat0, gr88 |
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201 | .reg FPStat1, gr89 |
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202 | .reg FPStat2, gr90 |
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203 | .reg FPStat3, gr91 |
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204 | |
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205 | ; The following registers are used temporarily during diagnostics. |
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206 | |
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207 | .reg XLINXReg, gr92 |
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208 | .reg VMBCReg, gr93 |
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209 | .reg UARTReg, gr94 |
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210 | .reg ETHERReg, gr95 |
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211 | |
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212 | ;* |
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213 | |
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214 | ;;* |
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215 | .reg heapptr, gr90 |
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216 | .reg ArgvPtr, gr91 |
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217 | ;;* |
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218 | |
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219 | |
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220 | |
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221 | ; |
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222 | ;* Preparing to export Register Names for the Linkers benefit. |
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223 | ; |
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224 | |
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225 | .equ RSpillAddrReg, &SpillAddrReg |
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226 | .equ RFillAddrReg, &FillAddrReg |
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227 | .equ RSignalAddrReg, &SignalAddrReg |
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228 | .equ Rpcb, &pcb |
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229 | |
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230 | .equ Retx, &etx |
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231 | .equ Rety, &ety |
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232 | .equ Retz, &etz |
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233 | .equ Reta, &eta |
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234 | |
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235 | .equ Retb, &etb |
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236 | .equ Retc, &etc |
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237 | .equ RTimerExt, &TimerExt |
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238 | .equ RTimerUtil, &TimerUtil |
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239 | |
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240 | .equ RLEDReg, &LEDReg |
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241 | .equ RERRReg, &ERRReg |
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242 | |
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243 | .equ Ret0, &et0 |
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244 | .equ Ret1, &et1 |
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245 | .equ Ret2, &et2 |
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246 | .equ Ret3, &et3 |
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247 | |
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248 | .equ RFPStat0, &FPStat0 |
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249 | .equ RFPStat1, &FPStat1 |
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250 | .equ RFPStat2, &FPStat2 |
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251 | .equ RFPStat3, &FPStat3 |
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252 | |
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253 | .equ Rheapptr, &heapptr |
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254 | .equ RHeapPtr, &heapptr |
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255 | .equ RArgvPtr, &ArgvPtr |
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256 | |
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257 | .equ Ret4, &et4 |
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258 | .equ Ret5, &et5 |
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259 | .equ Ret6, &et6 |
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260 | .equ Ret7, &et7 |
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261 | |
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262 | .equ RXLINXReg, &XLINXReg |
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263 | .equ RVMBCReg, &VMBCReg |
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264 | .equ RUARTReg, &UARTReg |
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265 | .equ RETHERReg, ÐERReg |
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266 | |
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267 | .global RSpillAddrReg, RFillAddrReg, RSignalAddrReg |
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268 | .global Rpcb, Retc |
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269 | .global RTimerExt, RTimerUtil, RLEDReg, RERRReg |
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270 | .global Ret0, Ret1, Ret2, Ret3, Ret4, Ret5, Ret6, Ret7, Reta, Retb |
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271 | .global Retx, Rety, Retz |
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272 | .global RFPStat0, RFPStat1, RFPStat2, RFPStat3 |
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273 | .global Rheapptr, RHeapPtr, RArgvPtr |
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274 | .global RXLINXReg, RVMBCReg, RUARTReg, RETHERReg |
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275 | |
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276 | ; |
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277 | ;************************************************************************* |
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278 | ; |
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279 | |
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280 | |
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281 | ; |
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282 | ; Rule 3: |
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283 | ; Gr96-Gr127 Compiler & Programmer use registers. |
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284 | ; 32 Registers for Compiler & Programmer use |
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285 | |
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286 | ; |
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287 | ; 16 Registers for Compiler Use. |
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288 | ; |
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289 | |
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290 | ; |
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291 | ; Compiler Temporaries and Function Return Values |
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292 | ; |
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293 | |
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294 | .reg v0, gr96 ; First word of Return Value |
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295 | .reg v1, gr97 |
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296 | .reg v2, gr98 |
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297 | .reg v3, gr99 |
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298 | |
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299 | .reg v4, gr100 |
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300 | .reg v5, gr101 |
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301 | .reg v6, gr102 |
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302 | .reg v7, gr103 |
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303 | |
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304 | .reg v8, gr104 |
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305 | .reg v9, gr105 |
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306 | .reg v10, gr106 |
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307 | .reg v11, gr107 |
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308 | |
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309 | .reg v12, gr108 |
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310 | .reg v13, gr109 |
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311 | .reg v14, gr110 |
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312 | .reg v15, gr111 |
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313 | |
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314 | .equ Rv0, &v0 |
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315 | .equ Rv1, &v1 |
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316 | .equ Rv2, &v2 |
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317 | .equ Rv3, &v3 |
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318 | |
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319 | .equ Rv4, &v4 |
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320 | .equ Rv5, &v5 |
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321 | .equ Rv6, &v6 |
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322 | .equ Rv7, &v7 |
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323 | |
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324 | .equ Rv8, &v8 |
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325 | .equ Rv9, &v9 |
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326 | .equ Rv10, &v10 |
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327 | .equ Rv11, &v11 |
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328 | |
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329 | .equ Rv12, &v12 |
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330 | .equ Rv13, &v13 |
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331 | .equ Rv14, &v14 |
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332 | .equ Rv15, &v15 |
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333 | |
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334 | .global Rv0, Rv1, Rv2, Rv3, Rv4, Rv5, Rv6, Rv7, Rv8, Rv9 |
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335 | .global Rv10, Rv11, Rv12, Rv13, Rv14, Rv15 |
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336 | |
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337 | |
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338 | ; |
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339 | ; User Process Statics Registers |
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340 | ; |
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341 | |
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342 | .reg rp0, gr112 ; Reserved for Programmer, #0 |
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343 | .reg rp1, gr113 ; Reserved for Programmer, #1 |
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344 | .reg rp2, gr114 ; Reserved for Programmer, #2 |
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345 | .reg rp3, gr115 ; Reserved for Programmer, #3 |
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346 | |
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347 | .equ Rrp0, &rp0 |
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348 | .equ Rrp1, &rp1 |
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349 | .equ Rrp2, &rp2 |
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350 | .equ Rrp3, &rp3 |
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351 | |
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352 | .global Rrp0, Rrp1, Rrp2, Rrp3 |
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353 | |
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354 | ; |
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355 | ; Compiler Temporaries II |
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356 | ; |
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357 | |
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358 | .reg tv0, gr116 ; |
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359 | .reg tv1, gr117 ; |
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360 | .reg tv2, gr118 ; |
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361 | .reg tv3, gr119 ; |
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362 | .reg tv4, gr120 ; |
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363 | |
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364 | .equ Rtv0, &tv0 ; |
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365 | .equ Rtv1, &tv1 ; |
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366 | .equ Rtv2, &tv2 ; |
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367 | .equ Rtv3, &tv3 ; |
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368 | .equ Rtv4, &tv4 ; |
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369 | |
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370 | .global Rtv0, Rtv1, Rtv2, Rtv3, Rtv4 |
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371 | |
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372 | ; |
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373 | ; Special pointers and registers for handlers and stack operations. |
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374 | ; |
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375 | |
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376 | .reg tav, gr121 ; Temp, Arg for Trap Handlers |
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377 | .reg tpc, gr122 ; Temp, Ret PC for Trap Handlers |
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378 | .reg lrp, gr123 ; Large Return Pointer |
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379 | .reg slp, gr124 ; Static Link Pointer |
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380 | |
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381 | .reg msp, gr125 ; Memory Stack Pointer |
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382 | .reg rab, gr126 ; Register Allocate Bound |
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383 | .reg rfb, gr127 ; Register Free Bound |
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384 | |
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385 | .equ Rtav, &tav |
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386 | .equ Rtpc, &tpc |
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387 | .equ Rlrp, &lrp |
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388 | .equ Rslp, &slp |
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389 | .equ Rmsp, &msp |
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390 | .equ Rrab, &rab |
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391 | .equ Rrfb, &rfb |
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392 | |
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393 | .global Rtav, Rtpc, Rlrp, Rslp, Rmsp, Rrab, Rrfb |
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