1 | /* |
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2 | ************************************************************************** |
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3 | * |
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4 | * Component: RDB servers |
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5 | * Module: servtgt.c |
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6 | * |
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7 | * $Id$ |
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8 | * |
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9 | ************************************************************************** |
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10 | */ |
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11 | |
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12 | #include <string.h> |
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13 | #include <sys/errno.h> |
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14 | #include <rdbg/rdbg.h> |
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15 | #include <rdbg/servrpc.h> |
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16 | #include <sys/socket.h> |
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17 | #include <assert.h> |
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18 | |
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19 | #ifdef DDEBUG |
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20 | #define Ptrace TgtDbgPtrace |
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21 | #else |
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22 | #define Ptrace TgtRealPtrace |
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23 | #endif |
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24 | |
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25 | /* |
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26 | * TgtBreakRestoreOrig - Restore original instruction at "addr" |
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27 | * just before single-stepping it. |
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28 | */ |
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29 | |
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30 | int |
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31 | TgtBreakRestoreOrig (int pid, void *addr, void *addr2) |
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32 | /* |
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33 | * Process identifier |
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34 | */ |
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35 | /* |
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36 | * Breakpoint address |
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37 | */ |
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38 | /* |
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39 | * Original instruction or bkpt number |
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40 | */ |
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41 | { |
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42 | int ret; |
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43 | int l; |
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44 | |
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45 | l = (long) Ptrace (RPT_PEEKTEXT, pid, addr, 0, NULL); /* assume ok */ |
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46 | ret = ORG_BREAK (l, (UINT32) addr2); /* reconstruct old instr */ |
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47 | ret = Ptrace (RPT_POKETEXT, pid, addr, ret, NULL); /* poke back old */ |
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48 | return ret; |
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49 | } |
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50 | |
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51 | /* |
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52 | * |
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53 | * TgtBreakCancelStep - Restore the breakpoint at "addr" if the single-step |
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54 | * has failed at the ptrace level. |
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55 | */ |
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56 | |
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57 | #define BKPT0(plst) ((BASE_BREAK*)(plst)->break_list) |
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58 | |
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59 | void |
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60 | TgtBreakCancelStep (PID_LIST * plst) |
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61 | { |
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62 | assert (plst->break_list); |
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63 | assert (BKPT0 (plst)->clr_step); |
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64 | |
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65 | if (plst->break_list && BKPT0 (plst)->clr_step) { |
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66 | int idx = BKPT0 (plst)->last_break; |
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67 | int data; |
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68 | |
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69 | data = Ptrace (RPT_PEEKTEXT, plst->pid, |
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70 | (char *) plst->break_list[idx].ee_loc, 0, NULL); |
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71 | assert (!IS_BREAK (data)); |
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72 | Ptrace (RPT_POKETEXT, plst->pid, |
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73 | (char *) plst->break_list[idx].ee_loc, |
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74 | (int) SET_BREAK (data), NULL); |
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75 | } |
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76 | } |
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77 | |
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78 | /* |
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79 | * TgtCreateNew - add a new process into the process management lists. |
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80 | */ |
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81 | |
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82 | void |
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83 | TgtCreateNew (PID pid, int conn, INT32 child, char *name, Boolean spawn) |
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84 | { |
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85 | int idx; |
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86 | |
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87 | for (idx = 0; idx < pid_list_cnt; idx++) |
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88 | if (!pid_list[idx].pid) |
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89 | break; /* find empty */ |
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90 | |
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91 | if (idx >= pid_list_cnt) { /* no empties, add more */ |
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92 | PID_LIST *tmp_pid_list = pid_list; |
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93 | |
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94 | pid_list_cnt += PID_LIST_INC; |
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95 | pid_list = (PID_LIST *) Realloc (pid_list, /* get new or extend */ |
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96 | pid_list_cnt * sizeof (PID_LIST)); |
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97 | if (!pid_list) { /* out of memory */ |
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98 | pid_list_cnt -= PID_LIST_INC; |
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99 | if (pid_list_cnt) { /* realloc failed - malloc again */ |
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100 | pid_list = tmp_pid_list; |
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101 | /* |
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102 | * above relies on old pointer being valid after failed realloc |
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103 | */ |
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104 | } |
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105 | return; /* failed */ |
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106 | } |
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107 | /* |
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108 | * now clear newly added space |
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109 | */ |
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110 | memset (pid_list + pid_list_cnt - PID_LIST_INC, 0, |
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111 | PID_LIST_INC * sizeof (PID_LIST)); |
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112 | idx = pid_list_cnt - PID_LIST_INC; |
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113 | } else /* clear entry we found */ |
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114 | memset (&pid_list[idx], 0, sizeof (PID_LIST)); |
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115 | |
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116 | /* |
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117 | * now fill in empty entry |
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118 | */ |
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119 | pid_list[idx].pid = pid; |
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120 | pid_list[idx].running = 1; /* we have not called wait yet */ |
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121 | pid_list[idx].primary_conn = (UCHAR) conn; /* primary owner */ |
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122 | if (conn != -1) { /* found caller */ |
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123 | pid_list[idx].owners = 1; |
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124 | PIDMAP_SET (conn, idx); /* mask in */ |
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125 | } |
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126 | pid_list[idx].thread = (UINT32) - 1; /* no thread for now */ |
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127 | pid_list[idx].last_start = LAST_START; /* handle MiX bug */ |
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128 | |
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129 | pid_list[idx].name = name ? (char *) StrDup (name) : (char *) NULL; |
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130 | |
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131 | } |
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132 | |
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133 | /* |
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134 | * TgtNotifyWaitChange - send event to clients indicating child changed state. |
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135 | */ |
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136 | |
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137 | void |
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138 | TgtNotifyWaitChange (PID pid, int status, Boolean exclude) |
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139 | { |
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140 | int conn, idx; |
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141 | |
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142 | idx = FindPidEntry (pid); /* locate the pid that changed */ |
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143 | if (idx < 0) { |
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144 | DPRINTF (("TgtNotifyWaitChange: pid %d not in our list\n", (int) pid)); |
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145 | return; /* not in our list */ |
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146 | } |
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147 | pid_list[idx].running = 0; /* not running */ |
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148 | pid_list[idx].state = status; /* save status of stop/term */ |
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149 | if (!pid_list[idx].owners && !STS_SIGNALLED (status)) |
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150 | TgtDelete (&pid_list[idx], -1, 0); /* terminated and no owners */ |
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151 | else { /* normal cases */ |
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152 | for (conn = 0; conn < conn_list_cnt; conn++) { /* now find all interested clients */ |
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153 | if (!conn_list[conn].in_use /* free entry */ |
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154 | || !PIDMAP_TEST (conn, idx)) |
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155 | continue; /* not using this pid */ |
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156 | if (conn == exclude) |
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157 | continue; /* do not do this one */ |
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158 | TspSendWaitChange (conn, BMSG_WAIT, 1, pid, 0, False); /* notify of change */ |
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159 | } |
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160 | } |
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161 | } |
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162 | |
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163 | /* |
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164 | * TgtNotifyAll - send a message to all clients interested in process. |
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165 | */ |
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166 | |
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167 | void |
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168 | TgtNotifyAll (int pid_idx, BACK_MSG msg, UINT16 spec, |
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169 | UINT32 context, int exclude, Boolean force) |
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170 | { |
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171 | int conn; |
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172 | |
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173 | DPRINTF (("TgtNotifyAll: msg %d (%s) for pid_idx=%d (%d,%d)\n", |
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174 | msg, BmsgNames[msg], pid_idx, exclude, force)); |
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175 | for (conn = 0; conn < conn_list_cnt; conn++) |
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176 | if (conn_list[conn].in_use /* not free */ |
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177 | && PIDMAP_TEST (conn, pid_idx)) { |
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178 | if (conn != exclude) |
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179 | TspSendWaitChange (conn, msg, spec, pid_list[pid_idx].pid, context, |
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180 | force); |
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181 | } |
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182 | } |
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183 | |
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184 | /* |
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185 | * TgtDelete - mark process as now uncontrolled. |
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186 | * |
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187 | * Notes: |
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188 | * - this function removes a process from the process list. |
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189 | * - the notify argument indicates a message to send if needed. |
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190 | */ |
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191 | |
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192 | void |
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193 | TgtDelete (PID_LIST * plst, int conn_idx, BACK_MSG notify) |
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194 | { |
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195 | int idx = plst - pid_list, cnt, conn; |
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196 | |
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197 | /* |
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198 | * found |
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199 | */ |
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200 | cnt = pid_list[idx].owners; |
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201 | if (cnt) { /* some connections to break */ |
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202 | for (conn = 0; cnt && conn < conn_list_cnt; conn++) |
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203 | if (conn_list[conn].in_use /* not free */ |
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204 | && PIDMAP_TEST (conn, idx)) { /* found one that uses it */ |
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205 | PIDMAP_CLEAR (conn, idx); |
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206 | if (notify && conn != conn_idx) |
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207 | TspSendWaitChange (conn, notify, 0, plst->pid, 0, True); |
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208 | if (!--cnt) |
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209 | break; |
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210 | } |
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211 | } |
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212 | if (pid_list[idx].name) |
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213 | Free (pid_list[idx].name); /* free string name back */ |
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214 | /* |
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215 | * Free breakpoint list |
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216 | */ |
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217 | if (pid_list[idx].break_list != NULL) { |
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218 | Free (pid_list[idx].break_list); |
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219 | } |
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220 | pid_list[idx].pid = 0; /* gone */ |
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221 | } |
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222 | |
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223 | /* |
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224 | * TgtKillAndDelete - kill or detach process and remove entry. |
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225 | */ |
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226 | |
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227 | int |
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228 | TgtKillAndDelete (PID_LIST * plst, struct svc_req *rqstp, Boolean term) |
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229 | { |
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230 | ptrace_in pin; /* used for ptrace call */ |
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231 | ptrace_out *pout; |
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232 | |
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233 | /* |
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234 | * Remove breakpoints |
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235 | */ |
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236 | if (plst->break_alloc > 0) { |
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237 | pin.pid = plst->pid; |
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238 | pin.addr.req = RPT_CLRBREAK; |
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239 | pin.data = 0; /* clear all */ |
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240 | pin.flags = PTRFLG_NON_OWNER; |
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241 | pout = RPCGENSRVNAME (ptrace_2_svc) (&pin, rqstp); |
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242 | if (pout->result < 0) { |
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243 | DPRINTF (("TgtKillAndDelete: RPT_CLRBREAK failed %d\n", getErrno ())); |
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244 | return -1; |
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245 | } |
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246 | } |
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247 | |
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248 | if (term) { /* kill */ |
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249 | pin.addr.ptrace_addr_data_in_u.address = 0; |
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250 | pin.data = -1; /* Don't want notification from slave */ |
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251 | pin.addr.req = RPT_KILL; |
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252 | } else { /* detach */ |
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253 | pin.addr.ptrace_addr_data_in_u.address = 1; |
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254 | pin.data = 0; |
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255 | pin.addr.req = RPT_DETACH; |
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256 | } |
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257 | pin.pid = plst->pid; |
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258 | pin.flags = PTRFLG_FREE | PTRFLG_NON_OWNER; |
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259 | |
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260 | DPRINTF (("TgtKillAndDelete: ptrace_2_svc (%s (%d), %d)\n", |
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261 | PtraceName (pin.addr.req), pin.addr.req, pin.pid)); |
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262 | |
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263 | pout = RPCGENSRVNAME (ptrace_2_svc) (&pin, rqstp); /* start it */ |
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264 | if (pout->errNo == ESRCH && plst->pid) |
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265 | TgtDelete (plst, -1, BMSG_KILLED); /* only entry remains */ |
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266 | return 0; |
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267 | } |
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268 | |
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269 | /* |
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270 | * TgtDetachCon - detach a connection's ownership of a process. |
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271 | */ |
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272 | |
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273 | void |
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274 | TgtDetachCon (int conn_idx, int pid_idx, Boolean delete) |
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275 | { |
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276 | if ((unsigned) pid_idx >= pid_list_cnt || !pid_list[pid_idx].pid) |
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277 | return; /* not valid */ |
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278 | if (PIDMAP_TEST (conn_idx, pid_idx)) { /* if an owner, release control */ |
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279 | PIDMAP_CLEAR (conn_idx, pid_idx); |
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280 | |
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281 | if (pid_list[pid_idx].owners) |
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282 | pid_list[pid_idx].owners--; |
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283 | if (pid_list[pid_idx].primary_conn == conn_idx) |
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284 | pid_list[pid_idx].primary_conn = NO_PRIMARY; |
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285 | if (delete |
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286 | && !pid_list[pid_idx].owners && PROC_TERMINATED (pid_list + pid_idx)) |
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287 | TgtDelete (&pid_list[pid_idx], -1, 0); /* remove entry */ |
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288 | } |
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289 | } |
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290 | |
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291 | /* ----------------------------------------------------------------------- |
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292 | TgtHandleChildChange - decide what action to take after wait() returns. |
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293 | Used in the master only. |
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294 | ----------------------------------------------------------------------- */ |
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295 | |
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296 | #ifdef DDEBUG |
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297 | static char *LastStartNames[] = { |
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298 | "NONE", "STEP", "CONT", "RANGE", |
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299 | "STEPOFF", "KILLED", "DETACHED" |
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300 | }; |
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301 | |
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302 | char * |
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303 | GetLastStartName (int last_start) |
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304 | { |
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305 | static char buf[32]; |
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306 | |
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307 | strcpy (buf, LastStartNames[last_start & ~LAST_START]); |
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308 | if (last_start & LAST_START) { |
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309 | strcat (buf, "+START"); |
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310 | } |
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311 | return buf; |
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312 | } |
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313 | #endif |
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314 | |
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315 | Boolean |
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316 | TgtHandleChildChange (PID pid, int *status, int *unexp, |
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317 | CPU_Exception_frame * ctx) |
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318 | { /* return False if continue, else stop */ |
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319 | int idx, sig; |
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320 | int bidx = 0; |
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321 | PID_LIST *plst; |
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322 | unsigned long PC; |
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323 | BASE_BREAK *base = NULL; /* break_list[0] is really BASE_BREAK */ |
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324 | int hadStepEmul; |
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325 | int origHadStepEmul; |
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326 | int stopWanted; |
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327 | |
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328 | DPRINTF (("TgtHandleChildChange: pid %d status %x cap\n", |
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329 | (int) pid, *status)); |
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330 | if (unexp) |
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331 | *unexp = 0; /* initialize to ok */ |
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332 | |
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333 | /* |
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334 | * first, find pid in question |
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335 | */ |
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336 | idx = FindPidEntry (pid); |
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337 | if (idx < 0) { /* cannot locate this process */ |
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338 | DPRINTF (("TgtHandleChildChange: unknown process (%s pid)\n", |
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339 | FindPidEntry (pid) >= 0 ? "stale" : "unknown")); |
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340 | if (unexp) |
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341 | *unexp = 1; /* Unexpected change */ |
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342 | return (False); /* unknown: ignore (used to stop and notify) */ |
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343 | } |
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344 | |
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345 | /* |
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346 | * found |
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347 | */ |
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348 | plst = &pid_list[idx]; /* pointer to entry */ |
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349 | /* |
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350 | * first we see if just stopped |
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351 | */ |
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352 | |
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353 | /* |
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354 | * copy ctxt |
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355 | */ |
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356 | CtxToRegs (ctx, &(plst->regs)); |
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357 | |
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358 | stopWanted = plst->stop_wanted; |
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359 | plst->stop_wanted = 0; /* For the next time */ |
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360 | |
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361 | hadStepEmul = BreakClear (plst, -1, -1) > 0; |
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362 | origHadStepEmul = hadStepEmul; /* hadStepEmul is cleared if real bkpt met */ |
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363 | |
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364 | if (STS_SIGNALLED (*status)) { /* stopped, not terminated */ |
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365 | sig = STS_GETSIG (*status); /* signal that stopped us */ |
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366 | |
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367 | /* |
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368 | * now, we read the registers and see what to do next |
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369 | */ |
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370 | if (TgtPtrace (RPT_GETREGS, pid, (void *) &plst->regs, 0, NULL) < 0) { |
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371 | memset (&plst->regs, 0, sizeof (plst->regs)); |
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372 | } |
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373 | |
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374 | /* |
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375 | * Get current thread |
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376 | */ |
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377 | plst->thread = TgtPtrace (RPT_GETTARGETTHREAD, pid, NULL, 0, NULL); |
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378 | |
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379 | if (sig == SIGTRAP) { /* stopped from break/step */ |
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380 | PC = plst->regs.REG_PC; |
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381 | /* |
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382 | * Must check PC to see whether in situations where we had |
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383 | * step emulation we are on a breakpoint or just |
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384 | * have returned from an emulated single-step |
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385 | */ |
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386 | if (BreakIdentify (plst, 0 /*no adjust */ , -1 /*no thread */ ) > 0) { |
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387 | hadStepEmul = 0; |
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388 | } |
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389 | plst->is_step = hadStepEmul || IS_STEP (plst->regs) |
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390 | || plst->last_start == LAST_START; |
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391 | DPRINTF (("TgtHandleChildChange: %s last_start %s\n", plst->is_step |
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392 | ? "step" : "break", GetLastStartName (plst->last_start))); |
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393 | |
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394 | if ((plst->is_step || origHadStepEmul || stopWanted) |
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395 | && (plst->last_start == LAST_STEP |
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396 | || plst->last_start == LAST_STEPOFF |
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397 | || plst->last_start == LAST_RANGE)) { |
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398 | DPRINTF (("TgtHandleChildChange: restoring stepped-off bkpt\n")); |
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399 | BreakSteppedOff (plst); |
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400 | } |
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401 | |
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402 | if (plst->last_start == LAST_STEPOFF && (plst->is_step || origHadStepEmul)) { /* stepped off break and now need cont */ |
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403 | DPRINTF (("TgtHandleChildChange: auto-resuming after step-off\n")); |
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404 | plst->last_start = LAST_CONT; /* convert to normal cont */ |
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405 | if (!stopWanted) { |
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406 | if (TgtPtrace (RPT_CONT, pid, (char *) 1, 0, NULL)) |
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407 | return True; /* tell people */ |
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408 | return (False); /* wait for change */ |
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409 | } |
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410 | DPRINTF (("TgtHandleChildChange: stop_wanted %d in step-off\n", |
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411 | stopWanted)); |
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412 | *status = STS_MAKESIG (stopWanted); |
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413 | return True; /* Stop and notify */ |
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414 | } |
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415 | |
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416 | base = plst->break_list ? ((BASE_BREAK *) plst->break_list) : |
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417 | ((BASE_BREAK *) NULL); |
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418 | /* |
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419 | * now see if step in range |
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420 | */ |
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421 | |
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422 | if (plst->last_start == LAST_RANGE /* step in range */ |
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423 | && (plst->is_step || origHadStepEmul) /* not a breakpoint */ |
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424 | &&PC >= base->range_start && PC <= base->range_end) { /* still in range, keep going */ |
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425 | if (stopWanted) { |
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426 | DPRINTF (("TgtHandleChildChange: stop_wanted %d in step-range\n", |
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427 | stopWanted)); |
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428 | } else { |
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429 | DPRINTF (("TgtHandleChildChange: Reservation at %x\n", |
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430 | plst->regs.REG_PC)); |
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431 | } |
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432 | } |
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433 | if (!plst->is_step) { /* was break */ |
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434 | bidx = BreakIdentify (plst, 1 /*adjust */ , plst->thread); |
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435 | if (bidx == 0) { |
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436 | DPRINTF (("TgtHandleChildChange: forwarding bkpt to kernel\n")); |
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437 | if (unexp) { |
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438 | *unexp = 1; |
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439 | } |
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440 | return False; |
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441 | } |
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442 | if (bidx < 0) { /* Unwanted breakpoint, must step it off */ |
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443 | ptrace_in pin; |
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444 | ptrace_out *out; |
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445 | if (origHadStepEmul) { |
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446 | DPRINTF (("TgtHandleChildChange: bkpt %x becomes step\n", |
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447 | plst->regs.REG_PC)); |
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448 | bidx = -bidx; |
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449 | plst->is_step = 1; |
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450 | base->clr_step = plst->break_list[bidx].type == BRKT_INSTR; |
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451 | base->last_break = bidx; |
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452 | return True; |
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453 | } |
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454 | if (stopWanted) { |
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455 | DPRINTF (("TgtHandleChildChange: stop_wanted %d at bkpt %x\n", |
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456 | stopWanted, plst->regs.REG_PC)); |
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457 | /* |
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458 | * The PC has already been adjusted by BreakIdentify |
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459 | */ |
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460 | *status = STS_MAKESIG (stopWanted); |
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461 | return True; |
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462 | } |
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463 | /* |
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464 | * All the handling is done in ptrace_2_svc() so call it |
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465 | */ |
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466 | bidx = -bidx; |
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467 | DPRINTF (("TgtHandleChildChange: last %d (%s) restarting bkpt %d\n", |
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468 | plst->last_start, GetLastStartName (plst->last_start), |
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469 | bidx)); |
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470 | base->clr_step = 1; |
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471 | base->last_break = bidx; /* remember which one */ |
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472 | plst->running = 0; /* So that ptrace is accepted */ |
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473 | pin.pid = plst->pid; |
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474 | |
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475 | if (plst->last_start == LAST_STEP) { |
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476 | pin.addr.req = RPT_SINGLESTEP; |
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477 | } else { |
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478 | pin.addr.req = RPT_CONT; |
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479 | } |
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480 | pin.addr.ptrace_addr_data_in_u.address = 1; |
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481 | pin.data = 0; |
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482 | pin.flags = PTRFLG_NON_OWNER; |
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483 | out = RPCGENSRVNAME (ptrace_2_svc) (&pin, NULL); |
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484 | if (out->result == 0) |
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485 | return False; /* Continue waiting */ |
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486 | DPRINTF (("TgtHandleChildChange: failed to restart bkpt!\n")); |
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487 | /* |
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488 | * If something went wrong, just stop on breakpoint |
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489 | */ |
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490 | } |
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491 | } |
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492 | } |
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493 | |
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494 | /* |
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495 | * else sig != SIGTRAP |
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496 | */ |
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497 | /* |
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498 | * finally, fill in stop info in break point array base |
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499 | */ |
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500 | if (bidx > 0) { /* store break info */ |
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501 | /* |
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502 | * will need to get off the break for SW breakpoints only |
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503 | */ |
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504 | base->clr_step = plst->break_list[bidx].type == BRKT_INSTR; |
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505 | base->last_break = bidx; /* remember which one */ |
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506 | } else if (base) { /* clear break info */ |
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507 | base->clr_step = False; /* not stopped on break */ |
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508 | base->last_break = 0; |
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509 | } |
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510 | /* |
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511 | * decision to notify owner based on last_start |
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512 | */ |
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513 | } /* stopped */ |
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514 | else { /* terminated */ |
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515 | |
---|
516 | if (plst->last_start == LAST_START) { /* spawn failed */ |
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517 | TgtNotifyAll (idx, BMSG_EXEC_FAIL, 0, 0, -1, True); |
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518 | plst->running = False; /* not running - dead */ |
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519 | plst->state = *status; /* contains errno in high word */ |
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520 | return (False); |
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521 | } |
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522 | |
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523 | else if ((UCHAR) (plst->last_start & ~LAST_START) < (UCHAR) LAST_KILLED) |
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524 | plst->last_start = LAST_NONE; /* doesn't matter anymore */ |
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525 | else |
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526 | return (False); /* killed and detach already notified */ |
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527 | } |
---|
528 | return (True); /* stop and notify */ |
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529 | } |
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530 | |
---|
531 | #ifdef DDEBUG |
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532 | |
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533 | /* |
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534 | * TgtDbgPtrace - debug version of ptrace. |
---|
535 | */ |
---|
536 | |
---|
537 | int |
---|
538 | TgtDbgPtrace (int request, PID pid, char *addr, int data, void *addr2) |
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539 | { |
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540 | int diag; |
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541 | |
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542 | DPRINTF (("TgtDbgPtrace: entered (%s (%d), %d, %x, %d, %x)\n", |
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543 | PtraceName (request), request, pid, (int) addr, data, |
---|
544 | (int) addr2)); |
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545 | |
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546 | if (request == RPT_WRITETEXT || request == RPT_WRITEDATA) { |
---|
547 | int i; |
---|
548 | |
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549 | DPRINTF (("TgtDbgPtrace:")); |
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550 | if (rdb_debug) { |
---|
551 | for (i = 0; i < data && i < 16; ++i) { |
---|
552 | printf (" %02x", ((char *) addr2)[i] & 0xFF); |
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553 | } |
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554 | printf ("\n"); |
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555 | } |
---|
556 | } |
---|
557 | |
---|
558 | diag = TgtRealPtrace (request, pid, addr, data, addr2); |
---|
559 | |
---|
560 | DPRINTF (("TgtDbgPtrace: returned %d (%x) errno %d\n", |
---|
561 | diag, diag, getErrno ())); |
---|
562 | |
---|
563 | if (request == RPT_GETREGS || request == RPT_GETTHREADREGS |
---|
564 | || request == RPT_SETREGS || request == RPT_SETTHREADREGS) { |
---|
565 | /* |
---|
566 | * Use DPRINTF() so as to have the id prefix |
---|
567 | */ |
---|
568 | DPRINTF (("TgtDbgPtrace: (%s) PC = %x, SP = %x, FP = %x\n", |
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569 | PtraceName (request), |
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570 | ((xdr_regs *) addr)->REG_PC, |
---|
571 | ((xdr_regs *) addr)->REG_SP, ((xdr_regs *) addr)->REG_FP)); |
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572 | } |
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573 | |
---|
574 | return (diag); |
---|
575 | } |
---|
576 | #endif /* DDEBUG */ |
---|