1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief SuperH CPU Context |
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5 | */ |
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6 | |
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7 | /* |
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8 | * Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and |
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9 | * Bernd Becker (becker@faw.uni-ulm.de) |
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10 | * |
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11 | * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany |
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12 | * |
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13 | * This program is distributed in the hope that it will be useful, |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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16 | * |
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17 | * COPYRIGHT (c) 1998. |
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18 | * On-Line Applications Research Corporation (OAR). |
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19 | * |
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20 | * The license and distribution terms for this file may be |
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21 | * found in the file LICENSE in this distribution or at |
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22 | * http://www.rtems.org/license/LICENSE. |
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23 | */ |
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24 | |
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25 | #ifdef HAVE_CONFIG_H |
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26 | #include "config.h" |
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27 | #endif |
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28 | |
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29 | #include <rtems/system.h> |
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30 | #include <rtems/score/cpu.h> |
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31 | #include <rtems/score/isr.h> |
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32 | #include <rtems/score/thread.h> |
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33 | #include <rtems/score/sh.h> |
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34 | |
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35 | /* |
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36 | * _CPU_Context_save_fp_context |
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37 | * |
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38 | * This routine is responsible for saving the FP context |
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39 | * at *fp_context_ptr. If the point to load the FP context |
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40 | * from is changed then the pointer is modified by this routine. |
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41 | * |
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42 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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43 | * the ** and a similarly named routine in this file is passed something |
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44 | * like a (Context_Control_fp *). The general rule on making this decision |
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45 | * is to avoid writing assembly language. |
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46 | */ |
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47 | |
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48 | void _CPU_Context_save_fp( |
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49 | Context_Control_fp **fp_context_ptr |
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50 | ) |
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51 | { |
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52 | #if SH_HAS_FPU |
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53 | |
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54 | asm volatile("\n\ |
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55 | mov.l @%0,r4 \n\ |
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56 | add %1,r4\n\ |
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57 | sts.l fpscr,@-r4\n\ |
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58 | sts.l fpul,@-r4\n\ |
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59 | lds %2,fpscr\n\ |
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60 | fmov dr14,@-r4\n\ |
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61 | fmov dr12,@-r4\n\ |
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62 | fmov dr10,@-r4\n\ |
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63 | fmov dr8,@-r4\n\ |
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64 | fmov dr6,@-r4\n\ |
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65 | fmov dr4,@-r4\n\ |
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66 | fmov dr2,@-r4\n\ |
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67 | fmov dr0,@-r4\n\ |
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68 | " |
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69 | #ifdef SH4_USE_X_REGISTERS |
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70 | "\ |
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71 | lds %3,fpscr\n\ |
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72 | fmov xd14,@-r4\n\ |
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73 | fmov xd12,@-r4\n\ |
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74 | fmov xd10,@-r4\n\ |
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75 | fmov xd8,@-r4\n\ |
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76 | fmov xd6,@-r4\n\ |
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77 | fmov xd4,@-r4\n\ |
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78 | fmov xd2,@-r4\n\ |
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79 | fmov xd0,@-r4\n\ |
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80 | " |
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81 | #endif |
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82 | "lds %4,fpscr\n\ |
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83 | " |
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84 | : |
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85 | : "r"(fp_context_ptr), "r"(sizeof(Context_Control_fp)), |
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86 | "r"(SH4_FPSCR_SZ), "r"(SH4_FPSCR_PR | SH4_FPSCR_SZ), "r"(SH4_FPSCR_PR) |
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87 | : "r4", "r0"); |
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88 | |
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89 | #endif |
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90 | |
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91 | } |
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92 | |
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93 | /* |
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94 | * _CPU_Context_restore_fp_context |
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95 | * |
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96 | * This routine is responsible for restoring the FP context |
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97 | * at *fp_context_ptr. If the point to load the FP context |
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98 | * from is changed then the pointer is modified by this routine. |
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99 | * |
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100 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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101 | * the ** and a similarly named routine in this file is passed something |
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102 | * like a (Context_Control_fp *). The general rule on making this decision |
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103 | * is to avoid writing assembly language. |
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104 | */ |
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105 | |
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106 | void _CPU_Context_restore_fp( |
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107 | Context_Control_fp **fp_context_ptr |
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108 | ) |
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109 | { |
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110 | |
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111 | #if SH_HAS_FPU |
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112 | |
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113 | asm volatile("\n\ |
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114 | mov.l @%0,r4 \n\ |
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115 | " |
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116 | #ifdef SH4_USE_X_REGISTERS |
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117 | "\n\ |
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118 | lds %1,fpscr\n\ |
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119 | fmov @r4+,xd0\n\ |
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120 | fmov @r4+,xd2\n\ |
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121 | fmov @r4+,xd4\n\ |
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122 | fmov @r4+,xd6\n\ |
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123 | fmov @r4+,xd8\n\ |
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124 | fmov @r4+,xd10\n\ |
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125 | fmov @r4+,xd12\n\ |
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126 | fmov @r4+,xd14\n\ |
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127 | " |
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128 | #endif |
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129 | "\n\ |
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130 | lds %2,fpscr\n\ |
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131 | fmov @r4+,dr0\n\ |
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132 | fmov @r4+,dr2\n\ |
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133 | fmov @r4+,dr4\n\ |
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134 | fmov @r4+,dr6\n\ |
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135 | fmov @r4+,dr8\n\ |
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136 | fmov @r4+,dr10\n\ |
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137 | fmov @r4+,dr12\n\ |
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138 | fmov @r4+,dr14\n\ |
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139 | lds.l @r4+,fpul\n\ |
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140 | lds.l @r4+,fpscr\n\ |
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141 | " : |
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142 | : "r"(fp_context_ptr), "r"(SH4_FPSCR_PR | SH4_FPSCR_SZ), "r"(SH4_FPSCR_SZ) |
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143 | : "r4", "r0"); |
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144 | #endif |
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145 | } |
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146 | |
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147 | /* _CPU_Context_switch |
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148 | * |
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149 | * This routine performs a normal non-FP context switch. |
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150 | */ |
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151 | |
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152 | /* within __CPU_Context_switch: |
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153 | * _CPU_Context_switch |
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154 | * _CPU_Context_restore |
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155 | * |
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156 | * This routine is generally used only to restart self in an |
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157 | * efficient manner. It may simply be a label in _CPU_Context_switch. |
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158 | * |
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159 | * NOTE: It should be safe not to store r4, r5 |
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160 | * |
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161 | * NOTE: It is doubtful if r0 is really needed to be stored |
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162 | * |
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163 | * NOTE: gbr is added, but should not be necessary, as it is |
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164 | * only used globally in this port. |
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165 | */ |
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166 | |
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167 | /* |
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168 | * FIXME: This is an ugly hack, but we wanted to avoid recalculating |
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169 | * the offset each time Context_Control is changed |
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170 | */ |
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171 | void _CPU_Context_switch( |
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172 | Context_Control *run, /* r4 */ |
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173 | Context_Control *heir /* r5 */ |
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174 | ) |
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175 | { |
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176 | |
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177 | asm volatile("\n\ |
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178 | .global __CPU_Context_switch\n\ |
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179 | __CPU_Context_switch:\n\ |
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180 | \n\ |
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181 | add %0,r4\n\ |
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182 | \n\ |
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183 | stc.l sr,@-r4\n\ |
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184 | stc.l gbr,@-r4\n\ |
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185 | mov.l r0,@-r4\n\ |
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186 | mov.l r1,@-r4\n\ |
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187 | mov.l r2,@-r4\n\ |
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188 | mov.l r3,@-r4\n\ |
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189 | \n\ |
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190 | mov.l r6,@-r4\n\ |
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191 | mov.l r7,@-r4\n\ |
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192 | mov.l r8,@-r4\n\ |
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193 | mov.l r9,@-r4\n\ |
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194 | mov.l r10,@-r4\n\ |
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195 | mov.l r11,@-r4\n\ |
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196 | mov.l r12,@-r4\n\ |
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197 | mov.l r13,@-r4\n\ |
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198 | mov.l r14,@-r4\n\ |
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199 | sts.l pr,@-r4\n\ |
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200 | sts.l mach,@-r4\n\ |
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201 | sts.l macl,@-r4\n\ |
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202 | mov.l r15,@-r4\n\ |
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203 | \n\ |
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204 | mov r5, r4" |
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205 | :: "i" (sizeof(Context_Control)) |
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206 | ); |
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207 | |
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208 | __asm__ volatile("\n\ |
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209 | .global __CPU_Context_restore\n\ |
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210 | __CPU_Context_restore:\n\ |
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211 | mov.l @r4+,r15\n\ |
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212 | lds.l @r4+,macl\n\ |
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213 | lds.l @r4+,mach\n\ |
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214 | lds.l @r4+,pr\n\ |
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215 | mov.l @r4+,r14\n\ |
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216 | mov.l @r4+,r13\n\ |
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217 | mov.l @r4+,r12\n\ |
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218 | mov.l @r4+,r11\n\ |
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219 | mov.l @r4+,r10\n\ |
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220 | mov.l @r4+,r9\n\ |
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221 | mov.l @r4+,r8\n\ |
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222 | mov.l @r4+,r7\n\ |
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223 | mov.l @r4+,r6\n\ |
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224 | \n\ |
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225 | mov.l @r4+,r3\n\ |
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226 | mov.l @r4+,r2\n\ |
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227 | mov.l @r4+,r1\n\ |
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228 | mov.l @r4+,r0\n\ |
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229 | ldc.l @r4+,gbr\n\ |
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230 | ldc.l @r4+,sr\n\ |
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231 | \n\ |
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232 | rts\n\ |
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233 | nop" ); |
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234 | } |
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