1 | /* |
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2 | * Copyright (c) 2016 Chris Johns <chrisj@rtems.org>. All rights reserved. |
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3 | * |
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4 | * Redistribution and use in source and binary forms, with or without |
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5 | * modification, are permitted provided that the following conditions |
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6 | * are met: |
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7 | * 1. Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * 2. Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * |
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13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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23 | * SUCH DAMAGE. |
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24 | */ |
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25 | |
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26 | #define TARGET_DEBUG 0 |
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27 | |
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28 | #ifdef HAVE_CONFIG_H |
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29 | #include "config.h" |
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30 | #endif |
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31 | |
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32 | #include <errno.h> |
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33 | #include <inttypes.h> |
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34 | #include <stdlib.h> |
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35 | |
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36 | #include <rtems.h> |
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37 | #include <rtems/score/threadimpl.h> |
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38 | |
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39 | #include "rtems-debugger-target.h" |
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40 | #include "rtems-debugger-threads.h" |
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41 | |
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42 | /** |
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43 | * Frame signature. |
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44 | */ |
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45 | #define TARGET_FRAME_MAGIC_NUM (2) |
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46 | #define TARGET_FRAME_MAGIC 0xdeadbeef, 0xb2107016 |
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47 | static const uint32_t |
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48 | frame_magic[TARGET_FRAME_MAGIC_NUM] = { TARGET_FRAME_MAGIC }; |
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49 | |
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50 | #if TARGET_DEBUG |
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51 | #include <rtems/bspIo.h> |
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52 | static void target_printk(const char* format, ...) RTEMS_PRINTFLIKE(1, 2); |
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53 | static void |
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54 | target_printk(const char* format, ...) |
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55 | { |
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56 | va_list ap; |
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57 | va_start(ap, format); |
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58 | vprintk(format, ap); |
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59 | va_end(ap); |
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60 | } |
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61 | #else |
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62 | #define target_printk(_fmt, ...) |
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63 | #endif |
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64 | |
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65 | int |
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66 | rtems_debugger_target_create(void) |
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67 | { |
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68 | if (rtems_debugger->target == NULL) { |
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69 | rtems_debugger_target* target; |
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70 | int r; |
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71 | |
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72 | target = calloc(1, sizeof(rtems_debugger_target)); |
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73 | if (target == NULL) { |
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74 | errno = ENOMEM; |
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75 | return -1; |
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76 | } |
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77 | |
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78 | r = rtems_debugger_target_configure(target); |
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79 | if (r < 0) { |
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80 | free(target); |
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81 | return -1; |
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82 | } |
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83 | |
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84 | if (target->breakpoint_size > RTEMS_DEBUGGER_TARGET_SWBREAK_MAX_SIZE) { |
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85 | free(target); |
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86 | rtems_debugger_printf("error: rtems-db: target: breakpoint size too big\n"); |
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87 | return -1; |
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88 | } |
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89 | |
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90 | r = rtems_debugger_block_create(&target->swbreaks, |
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91 | RTEMS_DEBUGGER_TARGET_SWBREAK_NUM, |
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92 | sizeof(rtems_debugger_target_swbreak)); |
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93 | if (r < 0) { |
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94 | free(target); |
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95 | return -1; |
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96 | } |
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97 | |
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98 | rtems_debugger->target = target; |
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99 | } |
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100 | |
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101 | return 0; |
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102 | } |
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103 | |
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104 | int |
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105 | rtems_debugger_target_destroy(void) |
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106 | { |
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107 | if (rtems_debugger->target != NULL) { |
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108 | rtems_debugger_target* target = rtems_debugger->target; |
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109 | rtems_debugger_target_swbreak_remove(); |
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110 | rtems_debugger_target_disable(); |
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111 | rtems_debugger_block_destroy(&target->swbreaks); |
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112 | free(target); |
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113 | rtems_debugger->target = NULL; |
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114 | } |
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115 | return 0; |
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116 | } |
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117 | |
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118 | uint32_t |
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119 | rtems_debugger_target_capabilities(void) |
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120 | { |
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121 | if (rtems_debugger->target != NULL) |
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122 | |
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123 | return rtems_debugger->target->capabilities; |
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124 | return 0; |
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125 | } |
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126 | |
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127 | size_t |
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128 | rtems_debugger_target_reg_num(void) |
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129 | { |
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130 | if (rtems_debugger->target != NULL) |
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131 | return rtems_debugger->target->reg_num; |
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132 | return 0; |
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133 | } |
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134 | |
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135 | size_t |
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136 | rtems_debugger_target_reg_size(void) |
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137 | { |
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138 | if (rtems_debugger->target != NULL) |
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139 | return rtems_debugger->target->reg_num * rtems_debugger->target->reg_size; |
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140 | return 0; |
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141 | } |
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142 | |
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143 | int |
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144 | rtems_debugger_target_swbreak_control(bool insert, DB_UINT addr, DB_UINT kind) |
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145 | { |
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146 | rtems_debugger_target* target = rtems_debugger->target; |
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147 | rtems_debugger_target_swbreak* swbreaks = target->swbreaks.block; |
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148 | size_t swbreak_size; |
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149 | uint8_t* loc = (void*) addr; |
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150 | size_t i; |
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151 | int r; |
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152 | |
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153 | if (target == NULL || swbreaks == NULL || kind != target->breakpoint_size) { |
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154 | errno = EIO; |
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155 | return -1; |
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156 | } |
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157 | |
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158 | swbreak_size = |
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159 | sizeof(rtems_debugger_target_swbreak) + target->breakpoint_size; |
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160 | |
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161 | for (i = 0; i < target->swbreaks.level; ++i) { |
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162 | if (loc == swbreaks[i].address) { |
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163 | size_t remaining; |
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164 | if (!insert) { |
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165 | --target->swbreaks.level; |
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166 | remaining = (target->swbreaks.level - i) * swbreak_size; |
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167 | memmove(&swbreaks[i], &swbreaks[i + 1], remaining); |
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168 | } |
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169 | return 0; |
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170 | } |
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171 | } |
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172 | |
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173 | if (!insert) |
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174 | return 0; |
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175 | |
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176 | r = rtems_debugger_block_resize(&target->swbreaks); |
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177 | if (r < 0) |
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178 | return -1; |
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179 | |
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180 | swbreaks = target->swbreaks.block; |
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181 | |
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182 | swbreaks[target->swbreaks.level].address = loc; |
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183 | if (target->breakpoint_size > 4) |
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184 | memcpy(&swbreaks[target->swbreaks.level].contents[0], |
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185 | loc, |
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186 | target->breakpoint_size); |
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187 | else { |
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188 | uint8_t* contents = &swbreaks[target->swbreaks.level].contents[0]; |
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189 | switch (target->breakpoint_size) { |
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190 | case 4: |
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191 | contents[3] = loc[3]; |
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192 | case 3: |
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193 | contents[2] = loc[2]; |
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194 | case 2: |
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195 | contents[1] = loc[1]; |
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196 | case 1: |
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197 | contents[0] = loc[0]; |
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198 | break; |
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199 | } |
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200 | } |
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201 | ++target->swbreaks.level; |
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202 | |
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203 | return 0; |
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204 | } |
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205 | |
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206 | int |
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207 | rtems_debugger_target_swbreak_insert(void) |
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208 | { |
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209 | rtems_debugger_target* target = rtems_debugger->target; |
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210 | int r = -1; |
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211 | if (target != NULL && target->swbreaks.block != NULL) { |
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212 | rtems_debugger_target_swbreak* swbreaks = target->swbreaks.block; |
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213 | size_t i; |
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214 | r = 0; |
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215 | for (i = 0; i < target->swbreaks.level; ++i) { |
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216 | uint8_t* loc = swbreaks[i].address; |
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217 | if (rtems_debugger_verbose()) |
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218 | rtems_debugger_printf("rtems-db: bp: in: %p\n", swbreaks[i].address); |
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219 | if (target->breakpoint_size > 4) |
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220 | memcpy(loc, &target->breakpoint[0], target->breakpoint_size); |
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221 | else { |
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222 | switch (target->breakpoint_size) { |
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223 | case 4: |
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224 | loc[3] = target->breakpoint[3]; |
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225 | case 3: |
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226 | loc[2] = target->breakpoint[2]; |
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227 | case 2: |
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228 | loc[1] = target->breakpoint[1]; |
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229 | case 1: |
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230 | loc[0] = target->breakpoint[0]; |
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231 | break; |
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232 | } |
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233 | } |
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234 | r = rtems_debugger_target_cache_sync(&swbreaks[i]); |
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235 | } |
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236 | } |
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237 | return r; |
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238 | } |
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239 | |
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240 | int |
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241 | rtems_debugger_target_swbreak_remove(void) |
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242 | { |
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243 | rtems_debugger_target* target = rtems_debugger->target; |
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244 | int r = -1; |
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245 | if (target != NULL && target->swbreaks.block != NULL) { |
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246 | rtems_debugger_target* target = rtems_debugger->target; |
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247 | rtems_debugger_target_swbreak* swbreaks = target->swbreaks.block; |
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248 | size_t i; |
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249 | r = 0; |
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250 | for (i = 0; i < target->swbreaks.level; ++i) { |
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251 | uint8_t* loc = swbreaks[i].address; |
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252 | uint8_t* contents = &swbreaks[i].contents[0]; |
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253 | if (rtems_debugger_verbose()) |
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254 | rtems_debugger_printf("rtems-db: bp: out: %p\n", swbreaks[i].address); |
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255 | if (target->breakpoint_size > 4) |
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256 | memcpy(loc, contents, target->breakpoint_size); |
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257 | else { |
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258 | switch (target->breakpoint_size) { |
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259 | case 4: |
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260 | loc[3] = contents[3]; |
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261 | case 3: |
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262 | loc[2] = contents[2]; |
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263 | case 2: |
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264 | loc[1] = contents[1]; |
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265 | case 1: |
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266 | loc[0] = contents[0]; |
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267 | break; |
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268 | } |
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269 | } |
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270 | r = rtems_debugger_target_cache_sync(&swbreaks[i]); |
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271 | } |
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272 | } |
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273 | return r; |
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274 | } |
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275 | |
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276 | rtems_debugger_target_exc_action |
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277 | rtems_debugger_target_exception(CPU_Exception_frame* frame) |
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278 | { |
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279 | volatile const uint32_t magic[3] = { |
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280 | (uint32_t) frame, TARGET_FRAME_MAGIC |
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281 | }; |
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282 | |
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283 | (void) magic; |
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284 | |
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285 | if (!rtems_interrupt_is_in_progress()) { |
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286 | rtems_debugger_threads* threads = rtems_debugger->threads; |
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287 | #if USE_THREAD_EXECUTING |
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288 | Thread_Control* thread = _Thread_Executing; |
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289 | #else |
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290 | const Per_CPU_Control* cpu = _Per_CPU_Get_snapshot(); |
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291 | Thread_Control* thread = _Per_CPU_Get_executing(cpu); |
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292 | #endif |
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293 | rtems_id* excludes; |
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294 | const rtems_id tid = thread->Object.id; |
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295 | DB_UINT pc; |
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296 | const rtems_debugger_thread_stepper* stepper; |
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297 | size_t i; |
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298 | |
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299 | target_printk("[} tid:%08" PRIx32 ": thread:%08" PRIxPTR |
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300 | " frame:%08" PRIxPTR "\n", |
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301 | tid, (intptr_t) thread, (intptr_t) frame); |
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302 | |
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303 | /* |
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304 | * If the thread is the debugger recover. |
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305 | */ |
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306 | if (tid == rtems_debugger->server_task) { |
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307 | if (rtems_debugger->target->memory_access) { |
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308 | target_printk("[} server access fault\n"); |
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309 | rtems_debugger->target->memory_access = true; |
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310 | longjmp(rtems_debugger->target->access_return, -1); |
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311 | } |
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312 | target_printk("[} server exception\n"); |
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313 | return rtems_debugger_target_exc_cascade; |
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314 | } |
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315 | |
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316 | /* |
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317 | * See if the thread is excluded. |
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318 | */ |
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319 | excludes = rtems_debugger_thread_excludes(threads); |
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320 | for (i = 0; i < threads->excludes.level; ++i) { |
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321 | if (tid == excludes[i]) { |
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322 | /* |
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323 | * We do nothing with this condition and cascade the exception. |
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324 | * |
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325 | * @todo: if this is a hwbreak carry on, if this is a swbreak replace |
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326 | * the contents of the instruction, step then return the |
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327 | * swbreak's contents. |
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328 | */ |
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329 | target_printk("[} tid:%08lx: excluded\n", tid); |
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330 | return rtems_debugger_target_exc_cascade; |
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331 | } |
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332 | } |
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333 | |
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334 | /* |
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335 | * See if the thread is inside the stepping a range. |
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336 | */ |
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337 | pc = rtems_debugger_target_frame_pc(frame); |
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338 | stepper = rtems_debugger_thread_is_stepping(tid, pc); |
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339 | if (stepper != NULL) { |
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340 | stepper->thread->frame = frame; |
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341 | rtems_debugger_target_thread_stepping(stepper->thread); |
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342 | target_printk("[} tid:%08lx: stepping\n", tid); |
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343 | return rtems_debugger_target_exc_step; |
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344 | } |
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345 | |
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346 | target_printk("[} tid:%08lx: suspending\n", tid); |
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347 | |
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348 | /* |
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349 | * Tag the thread as being debugged, wake the debug server's event thread, |
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350 | * then suspend this thread. |
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351 | */ |
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352 | _Thread_Set_state(thread, STATES_DEBUGGER); |
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353 | rtems_debugger_server_events_wake(); |
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354 | rtems_task_suspend(tid); |
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355 | |
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356 | target_printk("[} tid:%08lx: resuming\n", tid); |
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357 | |
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358 | return rtems_debugger_target_exc_consumed; |
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359 | } |
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360 | |
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361 | target_printk("[} cascade, in interrupt\n"); |
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362 | |
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363 | return rtems_debugger_target_exc_cascade; |
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364 | } |
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365 | |
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366 | int |
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367 | rtems_debugger_target_set_exception_frame(rtems_debugger_thread* thread) |
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368 | { |
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369 | int r = 0; |
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370 | thread->frame = NULL; |
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371 | thread->flags &= ~RTEMS_DEBUGGER_THREAD_FLAG_DEBUGGING; |
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372 | if ((thread->tcb->current_state & STATES_DEBUGGER) != 0) { |
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373 | CPU_Exception_frame* frame = NULL; |
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374 | DB_UINT* sp; |
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375 | int i; |
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376 | sp = (DB_UINT*) rtems_debugger_target_tcb_sp(thread); |
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377 | for (i = 0; i < 128; ++i) { |
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378 | if (sp[i] == frame_magic[0] && sp[i + 1] == frame_magic[1]) { |
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379 | frame = (CPU_Exception_frame*) sp[i + 2]; |
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380 | break; |
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381 | } |
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382 | } |
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383 | _Thread_Clear_state(thread->tcb, STATES_DEBUGGER); |
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384 | thread->frame = frame; |
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385 | if (frame != NULL) |
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386 | thread->flags |= RTEMS_DEBUGGER_THREAD_FLAG_DEBUGGING; |
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387 | else |
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388 | r = -1; |
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389 | } |
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390 | return r; |
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391 | } |
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392 | |
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393 | int |
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394 | rtems_debugger_target_start_memory_access(void) |
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395 | { |
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396 | rtems_debugger_target* target = rtems_debugger->target; |
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397 | target->memory_access = true; |
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398 | return setjmp(target->access_return); |
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399 | } |
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400 | |
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401 | void |
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402 | rtems_debugger_target_end_memory_access(void) |
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403 | { |
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404 | rtems_debugger->target->memory_access = false; |
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405 | } |
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