1 | |
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2 | /* cpu_asm.s 1.1 - 95/12/04 |
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3 | * |
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4 | * This file contains the assembly code for the PowerPC implementation |
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5 | * of RTEMS. |
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6 | * |
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7 | * Author: Andrew Bray <andy@i-cubed.co.uk> |
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8 | * |
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9 | * COPYRIGHT (c) 1995 by i-cubed ltd. |
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10 | * |
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11 | * To anyone who acknowledges that this file is provided "AS IS" |
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12 | * without any express or implied warranty: |
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13 | * permission to use, copy, modify, and distribute this file |
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14 | * for any purpose is hereby granted without fee, provided that |
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15 | * the above copyright notice and this notice appears in all |
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16 | * copies, and that the name of i-cubed limited not be used in |
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17 | * advertising or publicity pertaining to distribution of the |
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18 | * software without specific, written prior permission. |
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19 | * i-cubed limited makes no representations about the suitability |
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20 | * of this software for any purpose. |
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21 | * |
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22 | * Derived from c/src/exec/cpu/no_cpu/cpu_asm.c: |
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23 | * |
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24 | * COPYRIGHT (c) 1989-1997. |
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25 | * On-Line Applications Research Corporation (OAR). |
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26 | * Copyright assigned to U.S. Government, 1994. |
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27 | * |
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28 | * The license and distribution terms for this file may in |
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29 | * the file LICENSE in this distribution or at |
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30 | * http://www.OARcorp.com/rtems/license.html. |
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31 | * |
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32 | * $Id$ |
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33 | */ |
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34 | |
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35 | #include <asm.h> |
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36 | |
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37 | /* |
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38 | * Offsets for various Contexts |
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39 | */ |
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40 | .set GP_1, 0 |
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41 | .set GP_2, (GP_1 + 4) |
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42 | .set GP_13, (GP_2 + 4) |
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43 | .set GP_14, (GP_13 + 4) |
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44 | |
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45 | .set GP_15, (GP_14 + 4) |
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46 | .set GP_16, (GP_15 + 4) |
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47 | .set GP_17, (GP_16 + 4) |
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48 | .set GP_18, (GP_17 + 4) |
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49 | |
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50 | .set GP_19, (GP_18 + 4) |
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51 | .set GP_20, (GP_19 + 4) |
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52 | .set GP_21, (GP_20 + 4) |
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53 | .set GP_22, (GP_21 + 4) |
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54 | |
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55 | .set GP_23, (GP_22 + 4) |
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56 | .set GP_24, (GP_23 + 4) |
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57 | .set GP_25, (GP_24 + 4) |
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58 | .set GP_26, (GP_25 + 4) |
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59 | |
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60 | .set GP_27, (GP_26 + 4) |
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61 | .set GP_28, (GP_27 + 4) |
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62 | .set GP_29, (GP_28 + 4) |
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63 | .set GP_30, (GP_29 + 4) |
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64 | |
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65 | .set GP_31, (GP_30 + 4) |
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66 | .set GP_CR, (GP_31 + 4) |
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67 | .set GP_PC, (GP_CR + 4) |
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68 | .set GP_MSR, (GP_PC + 4) |
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69 | |
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70 | .set FP_0, 0 |
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71 | .set FP_1, (FP_0 + 4) |
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72 | .set FP_2, (FP_1 + 4) |
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73 | .set FP_3, (FP_2 + 4) |
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74 | .set FP_4, (FP_3 + 4) |
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75 | .set FP_5, (FP_4 + 4) |
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76 | .set FP_6, (FP_5 + 4) |
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77 | .set FP_7, (FP_6 + 4) |
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78 | .set FP_8, (FP_7 + 4) |
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79 | .set FP_9, (FP_8 + 4) |
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80 | .set FP_10, (FP_9 + 4) |
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81 | .set FP_11, (FP_10 + 4) |
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82 | .set FP_12, (FP_11 + 4) |
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83 | .set FP_13, (FP_12 + 4) |
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84 | .set FP_14, (FP_13 + 4) |
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85 | .set FP_15, (FP_14 + 4) |
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86 | .set FP_16, (FP_15 + 4) |
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87 | .set FP_17, (FP_16 + 4) |
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88 | .set FP_18, (FP_17 + 4) |
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89 | .set FP_19, (FP_18 + 4) |
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90 | .set FP_20, (FP_19 + 4) |
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91 | .set FP_21, (FP_20 + 4) |
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92 | .set FP_22, (FP_21 + 4) |
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93 | .set FP_23, (FP_22 + 4) |
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94 | .set FP_24, (FP_23 + 4) |
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95 | .set FP_25, (FP_24 + 4) |
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96 | .set FP_26, (FP_25 + 4) |
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97 | .set FP_27, (FP_26 + 4) |
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98 | .set FP_28, (FP_27 + 4) |
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99 | .set FP_29, (FP_28 + 4) |
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100 | .set FP_30, (FP_29 + 4) |
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101 | .set FP_31, (FP_30 + 4) |
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102 | .set FP_FPSCR, (FP_31 + 4) |
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103 | |
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104 | .set IP_LINK, 0 |
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105 | .set IP_0, (IP_LINK + 8) |
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106 | .set IP_2, (IP_0 + 4) |
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107 | |
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108 | .set IP_3, (IP_2 + 4) |
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109 | .set IP_4, (IP_3 + 4) |
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110 | .set IP_5, (IP_4 + 4) |
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111 | .set IP_6, (IP_5 + 4) |
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112 | |
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113 | .set IP_7, (IP_6 + 4) |
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114 | .set IP_8, (IP_7 + 4) |
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115 | .set IP_9, (IP_8 + 4) |
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116 | .set IP_10, (IP_9 + 4) |
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117 | |
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118 | .set IP_11, (IP_10 + 4) |
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119 | .set IP_12, (IP_11 + 4) |
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120 | .set IP_13, (IP_12 + 4) |
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121 | .set IP_28, (IP_13 + 4) |
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122 | |
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123 | .set IP_29, (IP_28 + 4) |
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124 | .set IP_30, (IP_29 + 4) |
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125 | .set IP_31, (IP_30 + 4) |
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126 | .set IP_CR, (IP_31 + 4) |
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127 | |
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128 | .set IP_CTR, (IP_CR + 4) |
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129 | .set IP_XER, (IP_CTR + 4) |
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130 | .set IP_LR, (IP_XER + 4) |
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131 | .set IP_PC, (IP_LR + 4) |
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132 | |
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133 | .set IP_MSR, (IP_PC + 4) |
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134 | .set IP_END, (IP_MSR + 16) |
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135 | |
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136 | BEGIN_CODE |
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137 | /* |
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138 | * _CPU_Context_save_fp_context |
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139 | * |
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140 | * This routine is responsible for saving the FP context |
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141 | * at *fp_context_ptr. If the point to load the FP context |
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142 | * from is changed then the pointer is modified by this routine. |
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143 | * |
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144 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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145 | * the ** and a similarly named routine in this file is passed something |
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146 | * like a (Context_Control_fp *). The general rule on making this decision |
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147 | * is to avoid writing assembly language. |
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148 | */ |
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149 | |
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150 | ALIGN (PPC_CACHE_ALIGNMENT, PPC_CACHE_ALIGN_POWER) |
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151 | PUBLIC_PROC (_CPU_Context_save_fp) |
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152 | PROC (_CPU_Context_save_fp): |
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153 | #if (PPC_HAS_FPU == 1) |
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154 | lwz r3, 0(r3) |
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155 | stfs f0, FP_0(r3) |
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156 | stfs f1, FP_1(r3) |
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157 | stfs f2, FP_2(r3) |
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158 | stfs f3, FP_3(r3) |
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159 | stfs f4, FP_4(r3) |
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160 | stfs f5, FP_5(r3) |
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161 | stfs f6, FP_6(r3) |
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162 | stfs f7, FP_7(r3) |
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163 | stfs f8, FP_8(r3) |
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164 | stfs f9, FP_9(r3) |
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165 | stfs f10, FP_10(r3) |
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166 | stfs f11, FP_11(r3) |
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167 | stfs f12, FP_12(r3) |
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168 | stfs f13, FP_13(r3) |
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169 | stfs f14, FP_14(r3) |
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170 | stfs f15, FP_15(r3) |
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171 | stfs f16, FP_16(r3) |
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172 | stfs f17, FP_17(r3) |
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173 | stfs f18, FP_18(r3) |
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174 | stfs f19, FP_19(r3) |
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175 | stfs f20, FP_20(r3) |
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176 | stfs f21, FP_21(r3) |
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177 | stfs f22, FP_22(r3) |
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178 | stfs f23, FP_23(r3) |
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179 | stfs f24, FP_24(r3) |
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180 | stfs f25, FP_25(r3) |
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181 | stfs f26, FP_26(r3) |
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182 | stfs f27, FP_27(r3) |
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183 | stfs f28, FP_28(r3) |
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184 | stfs f29, FP_29(r3) |
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185 | stfs f30, FP_30(r3) |
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186 | stfs f31, FP_31(r3) |
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187 | mffs f2 |
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188 | stfs f2, FP_FPSCR(r3) |
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189 | #endif |
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190 | blr |
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191 | |
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192 | /* |
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193 | * _CPU_Context_restore_fp_context |
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194 | * |
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195 | * This routine is responsible for restoring the FP context |
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196 | * at *fp_context_ptr. If the point to load the FP context |
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197 | * from is changed then the pointer is modified by this routine. |
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198 | * |
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199 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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200 | * the ** and a similarly named routine in this file is passed something |
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201 | * like a (Context_Control_fp *). The general rule on making this decision |
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202 | * is to avoid writing assembly language. |
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203 | */ |
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204 | |
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205 | ALIGN (PPC_CACHE_ALIGNMENT, PPC_CACHE_ALIGN_POWER) |
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206 | PUBLIC_PROC (_CPU_Context_restore_fp) |
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207 | PROC (_CPU_Context_restore_fp): |
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208 | #if (PPC_HAS_FPU == 1) |
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209 | lwz r3, 0(r3) |
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210 | lfs f2, FP_FPSCR(r3) |
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211 | mtfsf 255, f2 |
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212 | lfs f0, FP_0(r3) |
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213 | lfs f1, FP_1(r3) |
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214 | lfs f2, FP_2(r3) |
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215 | lfs f3, FP_3(r3) |
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216 | lfs f4, FP_4(r3) |
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217 | lfs f5, FP_5(r3) |
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218 | lfs f6, FP_6(r3) |
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219 | lfs f7, FP_7(r3) |
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220 | lfs f8, FP_8(r3) |
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221 | lfs f9, FP_9(r3) |
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222 | lfs f10, FP_10(r3) |
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223 | lfs f11, FP_11(r3) |
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224 | lfs f12, FP_12(r3) |
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225 | lfs f13, FP_13(r3) |
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226 | lfs f14, FP_14(r3) |
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227 | lfs f15, FP_15(r3) |
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228 | lfs f16, FP_16(r3) |
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229 | lfs f17, FP_17(r3) |
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230 | lfs f18, FP_18(r3) |
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231 | lfs f19, FP_19(r3) |
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232 | lfs f20, FP_20(r3) |
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233 | lfs f21, FP_21(r3) |
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234 | lfs f22, FP_22(r3) |
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235 | lfs f23, FP_23(r3) |
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236 | lfs f24, FP_24(r3) |
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237 | lfs f25, FP_25(r3) |
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238 | lfs f26, FP_26(r3) |
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239 | lfs f27, FP_27(r3) |
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240 | lfs f28, FP_28(r3) |
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241 | lfs f29, FP_29(r3) |
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242 | lfs f30, FP_30(r3) |
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243 | lfs f31, FP_31(r3) |
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244 | #endif |
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245 | blr |
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246 | |
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247 | |
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248 | /* _CPU_Context_switch |
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249 | * |
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250 | * This routine performs a normal non-FP context switch. |
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251 | */ |
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252 | ALIGN (PPC_CACHE_ALIGNMENT, PPC_CACHE_ALIGN_POWER) |
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253 | PUBLIC_PROC (_CPU_Context_switch) |
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254 | PROC (_CPU_Context_switch): |
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255 | sync |
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256 | isync |
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257 | /* This assumes that all the registers are in the given order */ |
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258 | li r5, 32 |
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259 | addi r3,r3,-4 |
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260 | #if ( PPC_USE_DATA_CACHE ) |
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261 | dcbz r5, r3 |
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262 | #endif |
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263 | stw r1, GP_1+4(r3) |
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264 | stw r2, GP_2+4(r3) |
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265 | #if (PPC_USE_MULTIPLE == 1) |
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266 | addi r3, r3, GP_18+4 |
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267 | #if ( PPC_USE_DATA_CACHE ) |
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268 | dcbz r5, r3 |
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269 | #endif |
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270 | stmw r13, GP_13-GP_18(r3) |
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271 | #else |
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272 | stw r13, GP_13+4(r3) |
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273 | stw r14, GP_14+4(r3) |
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274 | stw r15, GP_15+4(r3) |
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275 | stw r16, GP_16+4(r3) |
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276 | stw r17, GP_17+4(r3) |
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277 | stwu r18, GP_18+4(r3) |
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278 | #if ( PPC_USE_DATA_CACHE ) |
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279 | dcbz r5, r3 |
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280 | #endif |
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281 | stw r19, GP_19-GP_18(r3) |
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282 | stw r20, GP_20-GP_18(r3) |
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283 | stw r21, GP_21-GP_18(r3) |
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284 | stw r22, GP_22-GP_18(r3) |
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285 | stw r23, GP_23-GP_18(r3) |
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286 | stw r24, GP_24-GP_18(r3) |
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287 | stw r25, GP_25-GP_18(r3) |
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288 | stw r26, GP_26-GP_18(r3) |
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289 | stw r27, GP_27-GP_18(r3) |
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290 | stw r28, GP_28-GP_18(r3) |
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291 | stw r29, GP_29-GP_18(r3) |
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292 | stw r30, GP_30-GP_18(r3) |
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293 | stw r31, GP_31-GP_18(r3) |
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294 | #endif |
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295 | #if ( PPC_USE_DATA_CACHE ) |
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296 | dcbt r0, r4 |
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297 | #endif |
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298 | mfcr r6 |
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299 | stw r6, GP_CR-GP_18(r3) |
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300 | mflr r7 |
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301 | stw r7, GP_PC-GP_18(r3) |
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302 | mfmsr r8 |
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303 | stw r8, GP_MSR-GP_18(r3) |
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304 | |
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305 | #if ( PPC_USE_DATA_CACHE ) |
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306 | dcbt r5, r4 |
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307 | #endif |
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308 | lwz r1, GP_1(r4) |
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309 | lwz r2, GP_2(r4) |
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310 | #if (PPC_USE_MULTIPLE == 1) |
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311 | addi r4, r4, GP_19 |
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312 | #if ( PPC_USE_DATA_CACHE ) |
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313 | dcbt r5, r4 |
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314 | #endif |
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315 | lmw r13, GP_13-GP_19(r4) |
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316 | #else |
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317 | lwz r13, GP_13(r4) |
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318 | lwz r14, GP_14(r4) |
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319 | lwz r15, GP_15(r4) |
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320 | lwz r16, GP_16(r4) |
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321 | lwz r17, GP_17(r4) |
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322 | lwz r18, GP_18(r4) |
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323 | lwzu r19, GP_19(r4) |
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324 | #if ( PPC_USE_DATA_CACHE ) |
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325 | dcbt r5, r4 |
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326 | #endif |
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327 | lwz r20, GP_20-GP_19(r4) |
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328 | lwz r21, GP_21-GP_19(r4) |
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329 | lwz r22, GP_22-GP_19(r4) |
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330 | lwz r23, GP_23-GP_19(r4) |
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331 | lwz r24, GP_24-GP_19(r4) |
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332 | lwz r25, GP_25-GP_19(r4) |
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333 | lwz r26, GP_26-GP_19(r4) |
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334 | lwz r27, GP_27-GP_19(r4) |
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335 | lwz r28, GP_28-GP_19(r4) |
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336 | lwz r29, GP_29-GP_19(r4) |
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337 | lwz r30, GP_30-GP_19(r4) |
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338 | lwz r31, GP_31-GP_19(r4) |
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339 | #endif |
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340 | lwz r6, GP_CR-GP_19(r4) |
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341 | lwz r7, GP_PC-GP_19(r4) |
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342 | lwz r8, GP_MSR-GP_19(r4) |
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343 | mtcrf 255, r6 |
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344 | mtlr r7 |
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345 | mtmsr r8 |
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346 | |
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347 | blr |
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348 | |
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349 | /* |
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350 | * _CPU_Context_restore |
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351 | * |
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352 | * This routine is generallu used only to restart self in an |
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353 | * efficient manner. It may simply be a label in _CPU_Context_switch. |
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354 | * |
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355 | * NOTE: May be unnecessary to reload some registers. |
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356 | */ |
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357 | /* |
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358 | * ACB: Don't worry about cache optimisation here - this is not THAT critical. |
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359 | */ |
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360 | ALIGN (PPC_CACHE_ALIGNMENT, PPC_CACHE_ALIGN_POWER) |
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361 | PUBLIC_PROC (_CPU_Context_restore) |
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362 | PROC (_CPU_Context_restore): |
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363 | lwz r5, GP_CR(r3) |
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364 | lwz r6, GP_PC(r3) |
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365 | lwz r7, GP_MSR(r3) |
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366 | mtcrf 255, r5 |
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367 | mtlr r6 |
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368 | mtmsr r7 |
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369 | lwz r1, GP_1(r3) |
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370 | lwz r2, GP_2(r3) |
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371 | #if (PPC_USE_MULTIPLE == 1) |
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372 | lmw r13, GP_13(r3) |
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373 | #else |
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374 | lwz r13, GP_13(r3) |
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375 | lwz r14, GP_14(r3) |
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376 | lwz r15, GP_15(r3) |
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377 | lwz r16, GP_16(r3) |
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378 | lwz r17, GP_17(r3) |
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379 | lwz r18, GP_18(r3) |
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380 | lwz r19, GP_19(r3) |
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381 | lwz r20, GP_20(r3) |
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382 | lwz r21, GP_21(r3) |
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383 | lwz r22, GP_22(r3) |
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384 | lwz r23, GP_23(r3) |
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385 | lwz r24, GP_24(r3) |
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386 | lwz r25, GP_25(r3) |
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387 | lwz r26, GP_26(r3) |
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388 | lwz r27, GP_27(r3) |
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389 | lwz r28, GP_28(r3) |
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390 | lwz r29, GP_29(r3) |
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391 | lwz r30, GP_30(r3) |
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392 | lwz r31, GP_31(r3) |
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393 | #endif |
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394 | |
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395 | blr |
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396 | |
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