1 | /* |
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2 | ************************************************************************** |
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3 | * |
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4 | * Component = |
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5 | * |
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6 | * Synopsis = rdbg/powerpc/rdbg_f.c |
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7 | * |
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8 | * $Id$ |
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9 | * |
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10 | ************************************************************************** |
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11 | */ |
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12 | |
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13 | #include <rtems/score/cpu.h> |
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14 | #include <assert.h> |
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15 | #include <errno.h> |
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16 | #include <rdbg/reg.h> |
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17 | #include <rdbg/remdeb.h> |
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18 | #include <rdbg/rdbg.h> |
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19 | #include <rtems/score/thread.h> |
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20 | |
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21 | void |
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22 | CtxToRegs (const CPU_Exception_frame * ctx, xdr_regs * regs) |
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23 | { |
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24 | *((CPU_Exception_frame *) regs) = *ctx; |
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25 | } |
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26 | |
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27 | void |
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28 | RegsToCtx (const xdr_regs * regs, CPU_Exception_frame * ctx) |
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29 | { |
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30 | *ctx = *((CPU_Exception_frame *) regs); |
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31 | } |
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32 | |
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33 | void |
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34 | get_ctx_thread (Thread_Control * thread, CPU_Exception_frame * ctx) |
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35 | { |
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36 | unsigned int *ptr; |
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37 | unsigned int i; |
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38 | |
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39 | ctx->EXC_SRR0 = thread->Registers.pc; |
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40 | ctx->EXC_SRR1 = thread->Registers.msr; |
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41 | ctx->_EXC_number = 0xdeadbeef; |
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42 | |
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43 | ctx->GPR1 = thread->Registers.gpr1; |
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44 | ctx->GPR2 = thread->Registers.gpr2; |
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45 | /* |
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46 | * Fill with dummy values... |
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47 | */ |
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48 | ptr = &ctx->GPR3; |
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49 | for (i = 0; i < 10; i++) |
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50 | ptr[i] = 0xdeadbeef; |
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51 | |
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52 | ctx->GPR13 = thread->Registers.gpr13; |
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53 | ctx->GPR14 = thread->Registers.gpr14; |
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54 | ctx->GPR15 = thread->Registers.gpr15; |
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55 | ctx->GPR16 = thread->Registers.gpr16; |
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56 | ctx->GPR17 = thread->Registers.gpr17; |
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57 | ctx->GPR18 = thread->Registers.gpr18; |
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58 | ctx->GPR19 = thread->Registers.gpr19; |
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59 | ctx->GPR20 = thread->Registers.gpr20; |
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60 | ctx->GPR21 = thread->Registers.gpr21; |
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61 | ctx->GPR22 = thread->Registers.gpr22; |
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62 | ctx->GPR23 = thread->Registers.gpr23; |
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63 | ctx->GPR24 = thread->Registers.gpr24; |
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64 | ctx->GPR25 = thread->Registers.gpr25; |
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65 | ctx->GPR26 = thread->Registers.gpr26; |
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66 | ctx->GPR27 = thread->Registers.gpr27; |
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67 | ctx->GPR28 = thread->Registers.gpr28; |
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68 | ctx->GPR29 = thread->Registers.gpr29; |
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69 | ctx->GPR30 = thread->Registers.gpr30; |
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70 | ctx->GPR31 = thread->Registers.gpr31; |
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71 | ctx->EXC_CR = thread->Registers.cr; |
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72 | ctx->EXC_CTR = 0xdeadbeef; |
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73 | ctx->EXC_XER = 0xdeadbeef; |
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74 | ctx->EXC_LR = 0xdeadbeef; |
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75 | ctx->EXC_MSR = 0xdeadbeef; |
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76 | ctx->EXC_DAR = 0xdeadbeef; |
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77 | } |
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78 | |
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79 | void |
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80 | set_ctx_thread (Thread_Control * thread, CPU_Exception_frame * ctx) |
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81 | { |
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82 | thread->Registers.gpr1 = ctx->GPR1; |
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83 | thread->Registers.gpr2 = ctx->GPR2; |
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84 | |
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85 | thread->Registers.gpr13 = ctx->GPR13; |
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86 | thread->Registers.gpr14 = ctx->GPR14; |
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87 | thread->Registers.gpr15 = ctx->GPR15; |
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88 | thread->Registers.gpr16 = ctx->GPR16; |
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89 | thread->Registers.gpr17 = ctx->GPR17; |
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90 | thread->Registers.gpr18 = ctx->GPR18; |
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91 | thread->Registers.gpr19 = ctx->GPR19; |
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92 | thread->Registers.gpr20 = ctx->GPR20; |
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93 | thread->Registers.gpr21 = ctx->GPR21; |
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94 | thread->Registers.gpr22 = ctx->GPR22; |
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95 | thread->Registers.gpr23 = ctx->GPR23; |
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96 | thread->Registers.gpr24 = ctx->GPR24; |
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97 | thread->Registers.gpr25 = ctx->GPR25; |
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98 | thread->Registers.gpr26 = ctx->GPR26; |
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99 | thread->Registers.gpr27 = ctx->GPR27; |
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100 | thread->Registers.gpr28 = ctx->GPR28; |
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101 | thread->Registers.gpr29 = ctx->GPR29; |
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102 | thread->Registers.gpr30 = ctx->GPR30; |
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103 | thread->Registers.gpr31 = ctx->GPR31; |
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104 | thread->Registers.cr = ctx->EXC_CR; |
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105 | thread->Registers.pc = ctx->EXC_SRR0; |
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106 | thread->Registers.msr = ctx->EXC_SRR1; |
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107 | } |
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108 | |
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109 | int |
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110 | Single_Step (CPU_Exception_frame * ctx) |
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111 | { |
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112 | if ((ctx->EXC_SRR1 & MSR_SE) != 0 || ExitForSingleStep != 0) { |
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113 | /* |
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114 | * Check coherency |
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115 | */ |
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116 | assert ((ctx->EXC_SRR1 & MSR_SE) != 0); |
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117 | assert (ExitForSingleStep != 0); |
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118 | return 0; |
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119 | } |
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120 | ctx->EXC_SRR1 |= MSR_SE; |
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121 | ++ExitForSingleStep; |
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122 | return 0; |
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123 | } |
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124 | |
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125 | int |
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126 | CheckForSingleStep (CPU_Exception_frame * ctx) |
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127 | { |
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128 | if (ExitForSingleStep) { |
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129 | /* |
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130 | * This functions can be called both from |
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131 | * INT1 and INT3 handlers. In case it is |
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132 | * called from INT3, need to clear TF. |
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133 | */ |
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134 | ctx->EXC_SRR1 &= ~MSR_SE; |
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135 | ExitForSingleStep = 0; |
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136 | return 1; |
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137 | } |
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138 | return 0; |
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139 | } |
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140 | |
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141 | void |
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142 | CancelSingleStep (CPU_Exception_frame * ctx) |
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143 | { |
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144 | /* |
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145 | * Cancel scheduled SS |
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146 | */ |
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147 | ctx->EXC_SRR1 &= ~MSR_SE; |
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148 | ExitForSingleStep--; |
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149 | } |
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150 | |
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151 | static cpuExcHandlerType oldExcHandler; |
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152 | |
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153 | void |
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154 | connect_rdbg_exception () |
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155 | { |
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156 | /* |
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157 | * test if rdbg already connected its exception handler |
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158 | */ |
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159 | if (globalExceptHdl != BreakPointExcHdl) { |
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160 | oldExcHandler = globalExceptHdl; |
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161 | globalExceptHdl = BreakPointExcHdl; |
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162 | } |
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163 | } |
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164 | |
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165 | void |
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166 | disconnect_rdbg_exception () |
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167 | { |
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168 | /* |
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169 | * test if current execption handler is rdbg's one |
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170 | * and restore the original one in this case. |
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171 | */ |
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172 | if (globalExceptHdl == BreakPointExcHdl) { |
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173 | globalExceptHdl = oldExcHandler; |
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174 | } |
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175 | } |
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