1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * This file contains the basic algorithms for all assembly code used |
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7 | * in an specific CPU port of RTEMS. These algorithms must be implemented |
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8 | * in assembly language |
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9 | */ |
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10 | |
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11 | /* |
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12 | * COPYRIGHT (c) 1989-2012. |
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13 | * On-Line Applications Research Corporation (OAR). |
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14 | * |
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15 | * Redistribution and use in source and binary forms, with or without |
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16 | * modification, are permitted provided that the following conditions |
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17 | * are met: |
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18 | * 1. Redistributions of source code must retain the above copyright |
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19 | * notice, this list of conditions and the following disclaimer. |
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20 | * 2. Redistributions in binary form must reproduce the above copyright |
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21 | * notice, this list of conditions and the following disclaimer in the |
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22 | * documentation and/or other materials provided with the distribution. |
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23 | * |
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24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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34 | * POSSIBILITY OF SUCH DAMAGE. |
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35 | */ |
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36 | |
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37 | #ifdef HAVE_CONFIG_H |
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38 | #include "config.h" |
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39 | #endif |
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40 | |
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41 | #if 0 |
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42 | /** |
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43 | * This routine is responsible for saving the FP context |
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44 | * at *fp_context_ptr. If the point to load the FP context |
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45 | * from is changed then the pointer is modified by this routine. |
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46 | * |
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47 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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48 | * the ** and a similarly named routine in this file is passed something |
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49 | * like a (Context_Control_fp *). The general rule on making this decision |
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50 | * is to avoid writing assembly language. |
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51 | * |
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52 | * v850 Specific Information: |
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53 | * |
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54 | * The v850 appears to always have soft float. |
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55 | */ |
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56 | void _CPU_Context_save_fp( |
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57 | Context_Control_fp **fp_context_ptr |
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58 | ) |
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59 | { |
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60 | } |
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61 | |
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62 | /** |
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63 | * This routine is responsible for restoring the FP context |
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64 | * at *fp_context_ptr. If the point to load the FP context |
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65 | * from is changed then the pointer is modified by this routine. |
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66 | * |
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67 | * Sometimes a macro implementation of this is in cpu.h which dereferences |
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68 | * the ** and a similarly named routine in this file is passed something |
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69 | * like a (Context_Control_fp *). The general rule on making this decision |
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70 | * is to avoid writing assembly language. |
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71 | * |
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72 | * v850 Specific Information: |
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73 | * |
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74 | * XXX document implementation including references if appropriate |
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75 | */ |
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76 | void _CPU_Context_restore_fp( |
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77 | Context_Control_fp **fp_context_ptr |
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78 | ) |
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79 | { |
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80 | } |
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81 | #endif |
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82 | |
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83 | /** |
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84 | * This routine performs a normal non-FP context switch. |
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85 | * |
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86 | * v850 Specific Information: |
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87 | * |
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88 | * + r6 - running thread |
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89 | * + r7 - heir thread |
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90 | */ |
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91 | #define V850_CONTEXT_CONTROL_R1_OFFSET 0 |
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92 | #define V850_CONTEXT_CONTROL_R3_OFFSET 4 |
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93 | #define V850_CONTEXT_CONTROL_R20_OFFSET 8 |
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94 | #define V850_CONTEXT_CONTROL_R21_OFFSET 12 |
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95 | #define V850_CONTEXT_CONTROL_R22_OFFSET 16 |
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96 | #define V850_CONTEXT_CONTROL_R23_OFFSET 20 |
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97 | #define V850_CONTEXT_CONTROL_R24_OFFSET 24 |
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98 | #define V850_CONTEXT_CONTROL_R25_OFFSET 28 |
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99 | #define V850_CONTEXT_CONTROL_R26_OFFSET 32 |
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100 | #define V850_CONTEXT_CONTROL_R27_OFFSET 36 |
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101 | #define V850_CONTEXT_CONTROL_R28_OFFSET 40 |
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102 | #define V850_CONTEXT_CONTROL_R29_OFFSET 44 |
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103 | #define V850_CONTEXT_CONTROL_R31_OFFSET 48 |
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104 | #define V850_CONTEXT_CONTROL_PSW_OFFSET 52 |
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105 | |
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106 | .section .text |
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107 | .global __CPU_Context_switch |
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108 | .type __CPU_Context_switch, @function |
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109 | __CPU_Context_switch: |
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110 | st.w r1,V850_CONTEXT_CONTROL_R1_OFFSET[r6] |
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111 | st.w r3,V850_CONTEXT_CONTROL_R3_OFFSET[r6] |
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112 | st.w r20,V850_CONTEXT_CONTROL_R20_OFFSET[r6] |
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113 | st.w r21,V850_CONTEXT_CONTROL_R21_OFFSET[r6] |
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114 | st.w r22,V850_CONTEXT_CONTROL_R22_OFFSET[r6] |
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115 | st.w r23,V850_CONTEXT_CONTROL_R23_OFFSET[r6] |
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116 | st.w r24,V850_CONTEXT_CONTROL_R24_OFFSET[r6] |
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117 | st.w r25,V850_CONTEXT_CONTROL_R25_OFFSET[r6] |
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118 | st.w r26,V850_CONTEXT_CONTROL_R27_OFFSET[r6] |
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119 | st.w r27,V850_CONTEXT_CONTROL_R27_OFFSET[r6] |
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120 | st.w r28,V850_CONTEXT_CONTROL_R28_OFFSET[r6] |
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121 | st.w r29,V850_CONTEXT_CONTROL_R29_OFFSET[r6] |
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122 | st.w r31,V850_CONTEXT_CONTROL_R31_OFFSET[r6] |
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123 | stsr psw,r21 |
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124 | st.w r21,V850_CONTEXT_CONTROL_PSW_OFFSET[r6] |
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125 | restore: |
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126 | ld.w V850_CONTEXT_CONTROL_R1_OFFSET[r7],r1 |
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127 | ld.w V850_CONTEXT_CONTROL_R3_OFFSET[r7],r3 |
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128 | ld.w V850_CONTEXT_CONTROL_R20_OFFSET[r7],r20 |
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129 | ld.w V850_CONTEXT_CONTROL_R21_OFFSET[r7],r21 |
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130 | ld.w V850_CONTEXT_CONTROL_R22_OFFSET[r7],r22 |
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131 | ld.w V850_CONTEXT_CONTROL_R23_OFFSET[r7],r23 |
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132 | ld.w V850_CONTEXT_CONTROL_R24_OFFSET[r7],r24 |
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133 | ld.w V850_CONTEXT_CONTROL_R25_OFFSET[r7],r25 |
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134 | ld.w V850_CONTEXT_CONTROL_R27_OFFSET[r7],r26 |
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135 | ld.w V850_CONTEXT_CONTROL_R27_OFFSET[r7],r27 |
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136 | ld.w V850_CONTEXT_CONTROL_R28_OFFSET[r7],r28 |
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137 | ld.w V850_CONTEXT_CONTROL_R29_OFFSET[r7],r29 |
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138 | ld.w V850_CONTEXT_CONTROL_R31_OFFSET[r7],r31 |
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139 | ld.w V850_CONTEXT_CONTROL_PSW_OFFSET[r7],r7 |
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140 | ldsr r7,psw |
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141 | jmp [r31] |
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142 | |
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143 | |
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144 | /** |
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145 | * This routine is generally used only to restart self in an |
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146 | * efficient manner. It may simply be a label in _CPU_Context_switch. |
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147 | * |
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148 | * NOTE: May be unnecessary to reload some registers. |
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149 | * |
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150 | * v850 Specific Information: |
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151 | * |
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152 | * Move second parameter to first and jump to normal restore |
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153 | */ |
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154 | .section .text |
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155 | .global __CPU_Context_restore |
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156 | .type __CPU_Context_restore, @function |
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157 | __CPU_Context_restore: |
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158 | mov r6, r7 /* move to second parameter register */ |
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159 | br restore |
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