1 | /* Low level interface to ptrace, for the remote server for GDB. |
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2 | Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004 |
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3 | Free Software Foundation, Inc. |
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4 | |
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5 | This file is part of GDB. |
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6 | |
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7 | This program is free software; you can redistribute it and/or modify |
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8 | it under the terms of the GNU General Public License as published by |
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9 | the Free Software Foundation; either version 2 of the License, or |
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10 | (at your option) any later version. |
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11 | |
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12 | This program is distributed in the hope that it will be useful, |
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13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | GNU General Public License for more details. |
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16 | |
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17 | You should have received a copy of the GNU General Public License |
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18 | along with this program; if not, write to the Free Software |
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19 | Foundation, Inc., 59 Temple Place - Suite 330, |
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20 | Boston, MA 02111-1307, USA. */ |
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21 | |
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22 | #include "server.h" |
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23 | #include "linux-low.h" |
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24 | |
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25 | #include <sys/wait.h> |
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26 | #include <stdio.h> |
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27 | #include <sys/param.h> |
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28 | #include <sys/dir.h> |
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29 | #include <sys/ptrace.h> |
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30 | #include <sys/user.h> |
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31 | #include <signal.h> |
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32 | #include <sys/ioctl.h> |
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33 | #include <fcntl.h> |
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34 | #include <string.h> |
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35 | #include <stdlib.h> |
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36 | #include <unistd.h> |
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37 | #include <errno.h> |
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38 | #include <xenctrl.h> |
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39 | |
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40 | #define TRACE_ENTER /* printf("enter %s\n", __FUNCTION__) */ |
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41 | |
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42 | static int xc_handle; |
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43 | |
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44 | static inline int |
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45 | curvcpuid() |
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46 | { |
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47 | struct process_info *process; |
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48 | if (current_inferior == NULL) |
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49 | return 0; |
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50 | process = get_thread_process(current_inferior); |
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51 | return (process->thread_known ? process->tid : 0); |
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52 | |
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53 | } |
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54 | |
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55 | struct inferior_list all_processes; |
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56 | static int current_domid; |
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57 | static int expect_signal = 0; |
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58 | static int signal_to_send = 0; |
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59 | static void linux_resume (struct thread_resume *resume_info); |
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60 | static void linux_set_inferior (void); |
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61 | |
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62 | int debug_threads; |
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63 | int using_threads; |
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64 | extern int isfile; |
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65 | |
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66 | struct pending_signals |
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67 | { |
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68 | int signal; |
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69 | struct pending_signals *prev; |
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70 | }; |
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71 | |
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72 | #define PTRACE_ARG3_TYPE long |
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73 | #define PTRACE_XFER_TYPE long |
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74 | |
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75 | static int use_regsets_p = 1; |
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76 | |
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77 | |
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78 | #define pid_of(proc) ((proc)->head.id) |
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79 | |
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80 | /* FIXME: Delete eventually. */ |
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81 | #define inferior_pid (pid_of (get_thread_process (current_inferior))) |
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82 | |
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83 | /* This function should only be called if the process got a SIGTRAP. |
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84 | The SIGTRAP could mean several things. |
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85 | |
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86 | On i386, where decr_pc_after_break is non-zero: |
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87 | If we were single-stepping this process using PTRACE_SINGLESTEP, |
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88 | we will get only the one SIGTRAP (even if the instruction we |
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89 | stepped over was a breakpoint). The value of $eip will be the |
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90 | next instruction. |
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91 | If we continue the process using PTRACE_CONT, we will get a |
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92 | SIGTRAP when we hit a breakpoint. The value of $eip will be |
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93 | the instruction after the breakpoint (i.e. needs to be |
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94 | decremented). If we report the SIGTRAP to GDB, we must also |
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95 | report the undecremented PC. If we cancel the SIGTRAP, we |
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96 | must resume at the decremented PC. |
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97 | |
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98 | (Presumably, not yet tested) On a non-decr_pc_after_break machine |
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99 | with hardware or kernel single-step: |
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100 | If we single-step over a breakpoint instruction, our PC will |
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101 | point at the following instruction. If we continue and hit a |
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102 | breakpoint instruction, our PC will point at the breakpoint |
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103 | instruction. */ |
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104 | static CORE_ADDR |
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105 | get_stop_pc (void) |
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106 | { |
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107 | CORE_ADDR stop_pc = (*the_low_target.get_pc) (); |
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108 | |
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109 | if (get_thread_process (current_inferior)->stepping) |
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110 | return stop_pc; |
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111 | else |
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112 | return stop_pc - the_low_target.decr_pc_after_break; |
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113 | } |
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114 | |
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115 | static void * |
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116 | add_process (int pid, long tid) |
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117 | { |
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118 | struct process_info *process; |
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119 | |
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120 | process = (struct process_info *) malloc (sizeof (*process)); |
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121 | memset (process, 0, sizeof (*process)); |
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122 | |
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123 | process->head.id = pid; |
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124 | |
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125 | process->tid = tid; |
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126 | process->lwpid = tid; |
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127 | |
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128 | add_inferior_to_list (&all_processes, &process->head); |
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129 | |
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130 | return process; |
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131 | } |
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132 | |
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133 | /* Start an inferior process and returns its pid. |
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134 | ALLARGS is a vector of program-name and args. */ |
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135 | |
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136 | static int |
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137 | linux_create_inferior (char *program, char **allargs) |
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138 | { |
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139 | |
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140 | fprintf (stderr, "Cannot exec %s: %s.\n", program, |
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141 | strerror (errno)); |
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142 | fflush (stderr); |
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143 | _exit (0177); |
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144 | /* NOT REACHED */ |
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145 | return -1; |
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146 | } |
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147 | |
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148 | int |
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149 | linux_attach (int domid) |
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150 | { |
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151 | struct process_info *new_process; |
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152 | current_domid = domid; |
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153 | /* this is handled for all active vcpus in PTRACE_ATTACH via the thread_create_callback */ |
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154 | new_process = (struct process_info *) add_process (domid, curvcpuid()); |
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155 | /* Don't ignore the initial SIGSTOP if we just attached to this process. */ |
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156 | /* vcpuid == 0 */ |
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157 | add_thread (0, new_process); |
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158 | new_process->stop_expected = 0; |
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159 | |
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160 | if (xc_ptrace (xc_handle, PTRACE_ATTACH, domid, 0, isfile) != 0) { |
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161 | fprintf (stderr, "Cannot attach to domain %d: %s (%d)\n", domid, |
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162 | strerror (errno), errno); |
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163 | fflush (stderr); |
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164 | if (!using_threads) |
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165 | _exit (0177); |
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166 | } |
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167 | |
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168 | return 0; |
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169 | } |
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170 | |
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171 | /* Kill the inferior process. Make us have no inferior. */ |
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172 | |
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173 | static void |
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174 | linux_kill_one_process (struct inferior_list_entry *entry) |
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175 | { |
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176 | struct thread_info *thread = (struct thread_info *) entry; |
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177 | struct process_info *process = get_thread_process (thread); |
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178 | xc_ptrace (xc_handle, PTRACE_KILL, pid_of (process), 0, 0); |
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179 | } |
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180 | |
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181 | |
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182 | static void |
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183 | linux_kill (void) |
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184 | { |
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185 | for_each_inferior (&all_threads, linux_kill_one_process); |
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186 | } |
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187 | |
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188 | static void |
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189 | linux_detach_one_process (struct inferior_list_entry *entry) |
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190 | { |
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191 | |
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192 | xc_ptrace (xc_handle, PTRACE_DETACH, current_domid, 0, 0); |
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193 | } |
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194 | |
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195 | |
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196 | static void |
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197 | linux_detach (void) |
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198 | { |
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199 | for_each_inferior (&all_threads, linux_detach_one_process); |
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200 | } |
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201 | |
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202 | /* Return nonzero if the given thread is still alive. */ |
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203 | static int |
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204 | linux_thread_alive (int tid) |
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205 | { |
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206 | if (find_inferior_id (&all_threads, tid) != NULL) |
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207 | return 1; |
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208 | else |
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209 | return 0; |
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210 | } |
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211 | |
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212 | /* Wait for process, returns status. */ |
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213 | |
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214 | static unsigned char |
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215 | linux_wait (char *status) |
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216 | { |
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217 | int w; |
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218 | if (xc_waitdomain(xc_handle, current_domid, &w, 0)) |
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219 | return -1; |
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220 | |
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221 | *status = 'T'; |
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222 | if (expect_signal) |
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223 | return expect_signal; |
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224 | else |
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225 | return SIGTRAP; |
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226 | |
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227 | } |
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228 | |
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229 | static void |
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230 | linux_resume (struct thread_resume *resume_info) |
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231 | { |
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232 | int step = resume_info->step; |
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233 | TRACE_ENTER; |
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234 | expect_signal = resume_info->sig; |
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235 | for_each_inferior(&all_threads, regcache_invalidate_one); |
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236 | if (debug_threads) |
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237 | fprintf(stderr, "step: %d\n", step); |
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238 | xc_ptrace (xc_handle, step ? PTRACE_SINGLESTEP : PTRACE_CONT, |
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239 | resume_info->thread, 0, 0); |
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240 | |
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241 | } |
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242 | |
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243 | |
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244 | static int |
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245 | regsets_fetch_inferior_registers () |
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246 | { |
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247 | struct regset_info *regset; |
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248 | TRACE_ENTER; |
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249 | regset = target_regsets; |
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250 | |
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251 | while (regset->size >= 0) |
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252 | { |
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253 | void *buf; |
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254 | int res; |
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255 | |
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256 | if (regset->size == 0) |
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257 | { |
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258 | regset ++; |
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259 | continue; |
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260 | } |
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261 | |
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262 | buf = malloc (regset->size); |
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263 | res = xc_ptrace (xc_handle, regset->get_request, |
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264 | curvcpuid(), |
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265 | 0, (PTRACE_XFER_TYPE)buf); |
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266 | if (res < 0) |
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267 | { |
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268 | if (errno == EIO) |
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269 | { |
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270 | /* If we get EIO on the first regset, do not try regsets again. |
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271 | If we get EIO on a later regset, disable that regset. */ |
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272 | if (regset == target_regsets) |
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273 | { |
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274 | use_regsets_p = 0; |
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275 | return -1; |
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276 | } |
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277 | else |
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278 | { |
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279 | regset->size = 0; |
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280 | continue; |
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281 | } |
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282 | } |
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283 | else |
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284 | { |
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285 | char s[256]; |
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286 | sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d", |
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287 | inferior_pid); |
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288 | perror (s); |
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289 | } |
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290 | } |
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291 | regset->store_function (buf); |
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292 | regset ++; |
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293 | } |
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294 | return 0; |
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295 | } |
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296 | |
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297 | static int |
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298 | regsets_store_inferior_registers () |
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299 | { |
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300 | struct regset_info *regset; |
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301 | TRACE_ENTER; |
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302 | regset = target_regsets; |
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303 | |
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304 | while (regset->size >= 0) |
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305 | { |
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306 | void *buf; |
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307 | int res; |
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308 | |
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309 | if (regset->size == 0) |
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310 | { |
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311 | regset ++; |
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312 | continue; |
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313 | } |
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314 | |
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315 | buf = malloc (regset->size); |
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316 | regset->fill_function (buf); |
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317 | res = xc_ptrace (xc_handle, regset->set_request, curvcpuid(), 0, (PTRACE_XFER_TYPE)buf); |
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318 | if (res < 0) |
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319 | { |
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320 | if (errno == EIO) |
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321 | { |
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322 | /* If we get EIO on the first regset, do not try regsets again. |
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323 | If we get EIO on a later regset, disable that regset. */ |
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324 | if (regset == target_regsets) |
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325 | { |
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326 | use_regsets_p = 0; |
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327 | return -1; |
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328 | } |
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329 | else |
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330 | { |
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331 | regset->size = 0; |
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332 | continue; |
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333 | } |
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334 | } |
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335 | else |
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336 | { |
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337 | #ifdef DEBUG |
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338 | perror ("Warning: ptrace(regsets_store_inferior_registers)"); |
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339 | #endif |
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340 | } |
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341 | } |
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342 | regset ++; |
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343 | free (buf); |
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344 | } |
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345 | return 0; |
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346 | } |
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347 | |
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348 | |
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349 | |
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350 | |
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351 | void |
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352 | linux_fetch_registers (int regno) |
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353 | { |
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354 | if (use_regsets_p) |
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355 | { |
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356 | if (regsets_fetch_inferior_registers () == 0) |
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357 | return; |
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358 | } |
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359 | |
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360 | } |
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361 | |
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362 | void |
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363 | linux_store_registers (int regno) |
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364 | { |
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365 | if (use_regsets_p) |
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366 | { |
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367 | if (regsets_store_inferior_registers () == 0) |
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368 | return; |
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369 | } |
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370 | } |
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371 | |
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372 | |
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373 | /* Copy LEN bytes from inferior's memory starting at MEMADDR |
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374 | to debugger memory starting at MYADDR. */ |
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375 | |
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376 | static int |
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377 | linux_read_memory (CORE_ADDR memaddr, char *myaddr, int len) |
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378 | { |
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379 | register int i; |
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380 | /* Round starting address down to longword boundary. */ |
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381 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
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382 | /* Round ending address up; get number of longwords that makes. */ |
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383 | register int count |
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384 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) |
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385 | / sizeof (PTRACE_XFER_TYPE); |
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386 | /* Allocate buffer of that many longwords. */ |
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387 | register PTRACE_XFER_TYPE *buffer |
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388 | = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
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389 | |
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390 | TRACE_ENTER; |
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391 | /* Read all the longwords */ |
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392 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
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393 | { |
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394 | errno = 0; |
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395 | buffer[i] = xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(), (PTRACE_ARG3_TYPE) addr, 0); |
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396 | if (errno) |
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397 | return errno; |
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398 | } |
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399 | |
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400 | /* Copy appropriate bytes out of the buffer. */ |
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401 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len); |
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402 | |
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403 | return 0; |
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404 | } |
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405 | |
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406 | /* Copy LEN bytes of data from debugger memory at MYADDR |
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407 | to inferior's memory at MEMADDR. |
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408 | On failure (cannot write the inferior) |
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409 | returns the value of errno. */ |
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410 | |
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411 | static int |
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412 | linux_write_memory (CORE_ADDR memaddr, const char *myaddr, int len) |
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413 | { |
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414 | register int i; |
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415 | /* Round starting address down to longword boundary. */ |
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416 | register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE); |
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417 | /* Round ending address up; get number of longwords that makes. */ |
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418 | register int count |
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419 | = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE); |
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420 | /* Allocate buffer of that many longwords. */ |
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421 | register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); |
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422 | extern int errno; |
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423 | |
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424 | TRACE_ENTER; |
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425 | |
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426 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
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427 | |
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428 | buffer[0] = xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(), |
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429 | (PTRACE_ARG3_TYPE) addr, 0); |
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430 | |
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431 | if (count > 1) |
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432 | { |
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433 | buffer[count - 1] |
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434 | = xc_ptrace (xc_handle, PTRACE_PEEKTEXT, curvcpuid(), |
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435 | (PTRACE_ARG3_TYPE) (addr + (count - 1) |
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436 | * sizeof (PTRACE_XFER_TYPE)), |
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437 | 0); |
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438 | } |
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439 | |
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440 | /* Copy data to be written over corresponding part of buffer */ |
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441 | |
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442 | memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len); |
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443 | |
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444 | /* Write the entire buffer. */ |
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445 | for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) |
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446 | { |
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447 | errno = 0; |
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448 | xc_ptrace (xc_handle, PTRACE_POKETEXT, curvcpuid(), |
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449 | (PTRACE_ARG3_TYPE) addr, buffer[i]); |
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450 | if (errno) |
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451 | return errno; |
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452 | } |
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453 | |
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454 | return 0; |
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455 | } |
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456 | |
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457 | static void |
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458 | linux_look_up_symbols (void) |
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459 | { |
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460 | if (using_threads) |
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461 | return; |
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462 | |
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463 | using_threads = thread_db_init (); |
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464 | |
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465 | } |
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466 | |
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467 | static void |
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468 | linux_send_signal (int signum) |
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469 | { |
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470 | extern int signal_pid; |
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471 | |
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472 | TRACE_ENTER; |
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473 | signal_to_send = signum; |
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474 | psignal(signum, "need to send "); |
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475 | if (cont_thread > 0) |
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476 | { |
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477 | struct process_info *process; |
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478 | |
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479 | process = get_thread_process (current_inferior); |
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480 | kill (process->lwpid, signum); |
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481 | } |
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482 | else |
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483 | kill (signal_pid, signum); |
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484 | } |
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485 | |
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486 | /* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET |
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487 | to debugger memory starting at MYADDR. */ |
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488 | |
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489 | static int |
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490 | linux_read_auxv (CORE_ADDR offset, char *myaddr, unsigned int len) |
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491 | { |
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492 | char filename[PATH_MAX]; |
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493 | int fd, n; |
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494 | |
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495 | TRACE_ENTER; |
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496 | snprintf (filename, sizeof filename, "/proc/%d/auxv", inferior_pid); |
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497 | |
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498 | fd = open (filename, O_RDONLY); |
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499 | if (fd < 0) |
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500 | return -1; |
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501 | |
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502 | if (offset != (CORE_ADDR) 0 |
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503 | && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset) |
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504 | n = -1; |
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505 | else |
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506 | n = read (fd, myaddr, len); |
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507 | |
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508 | close (fd); |
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509 | |
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510 | return n; |
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511 | } |
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512 | |
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513 | |
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514 | static struct target_ops linux_xen_target_ops = { |
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515 | linux_create_inferior, |
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516 | linux_attach, |
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517 | linux_kill, |
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518 | linux_detach, |
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519 | linux_thread_alive, |
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520 | linux_resume, |
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521 | linux_wait, |
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522 | linux_fetch_registers, |
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523 | linux_store_registers, |
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524 | linux_read_memory, |
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525 | linux_write_memory, |
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526 | linux_look_up_symbols, |
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527 | linux_send_signal, |
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528 | linux_read_auxv, |
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529 | }; |
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530 | |
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531 | static void |
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532 | linux_init_signals () |
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533 | { |
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534 | /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads |
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535 | to find what the cancel signal actually is. */ |
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536 | signal (__SIGRTMIN+1, SIG_IGN); |
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537 | } |
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538 | |
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539 | void |
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540 | initialize_low (void) |
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541 | { |
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542 | using_threads = 0; |
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543 | xc_handle = xc_interface_open(); |
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544 | set_target_ops (&linux_xen_target_ops); |
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545 | set_breakpoint_data (the_low_target.breakpoint, |
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546 | the_low_target.breakpoint_len); |
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547 | init_registers (); |
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548 | linux_init_signals (); |
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549 | using_threads = thread_db_init (); |
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550 | |
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551 | } |
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552 | |
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553 | |
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554 | static void |
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555 | thread_create_callback(long vcpuid) |
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556 | { |
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557 | struct thread_info *inferior; |
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558 | struct process_info *process; |
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559 | |
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560 | /* If we are attaching to our first thread, things are a little |
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561 | * different. |
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562 | */ |
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563 | if (all_threads.head == all_threads.tail) |
---|
564 | { |
---|
565 | inferior = (struct thread_info *) all_threads.head; |
---|
566 | process = get_thread_process (inferior); |
---|
567 | if (process->thread_known == 0) |
---|
568 | { |
---|
569 | /* Switch to indexing the threads list by TID. */ |
---|
570 | change_inferior_id (&all_threads, vcpuid); |
---|
571 | goto found; |
---|
572 | } |
---|
573 | } |
---|
574 | if (debug_threads) |
---|
575 | fprintf (stderr, "looking up thread %ld\n", |
---|
576 | vcpuid); |
---|
577 | inferior = (struct thread_info *) find_inferior_id (&all_threads, |
---|
578 | vcpuid); |
---|
579 | /* if vcpu alread registered - do nothing */ |
---|
580 | if (inferior != NULL) |
---|
581 | return; |
---|
582 | |
---|
583 | if (debug_threads) |
---|
584 | fprintf (stderr, "Attaching to thread %ld\n", |
---|
585 | vcpuid); |
---|
586 | |
---|
587 | process = add_process(current_domid, vcpuid); |
---|
588 | |
---|
589 | add_thread(vcpuid, process); |
---|
590 | inferior = (struct thread_info *) find_inferior_id (&all_threads, |
---|
591 | vcpuid); |
---|
592 | if (inferior == NULL) |
---|
593 | { |
---|
594 | warning ("Could not attach to thread %ld\n", |
---|
595 | vcpuid); |
---|
596 | return; |
---|
597 | } |
---|
598 | |
---|
599 | |
---|
600 | found: |
---|
601 | if (debug_threads) |
---|
602 | fprintf (stderr, "notifying of new thread %ld\n", |
---|
603 | vcpuid); |
---|
604 | new_thread_notify (vcpuid); |
---|
605 | |
---|
606 | process->tid = vcpuid; |
---|
607 | process->lwpid = vcpuid; |
---|
608 | |
---|
609 | process->thread_known = 1; |
---|
610 | } |
---|
611 | |
---|
612 | static void |
---|
613 | thread_death_callback(long vcpuid) |
---|
614 | { |
---|
615 | if (debug_threads) |
---|
616 | fprintf (stderr, "Buuurp...! CPU down event.\n"); |
---|
617 | } |
---|
618 | |
---|
619 | int |
---|
620 | thread_db_init(void) |
---|
621 | { |
---|
622 | debug_threads = 0; |
---|
623 | xc_register_event_handler(thread_create_callback, TD_CREATE); |
---|
624 | xc_register_event_handler(thread_death_callback, TD_DEATH); |
---|
625 | return 1; |
---|
626 | } |
---|
627 | |
---|
628 | /* XXX GAG ME */ |
---|
629 | static int breakpoint_found; |
---|
630 | static void |
---|
631 | set_breakpoint_inferior (struct inferior_list_entry *entry) |
---|
632 | { |
---|
633 | struct thread_info *thread = (struct thread_info *) entry; |
---|
634 | struct thread_info *saved_inferior = current_inferior; |
---|
635 | CORE_ADDR eip; |
---|
636 | unsigned char buf[2] = {0, 0}; |
---|
637 | current_inferior = thread; |
---|
638 | if (!breakpoint_found) { |
---|
639 | eip = get_stop_pc(); |
---|
640 | linux_read_memory(eip, buf, 1); |
---|
641 | if (buf[0] == 0xcc) { |
---|
642 | breakpoint_found = 1; |
---|
643 | return; |
---|
644 | } |
---|
645 | } else if (breakpoint_found == 2) { |
---|
646 | if (get_thread_process (current_inferior)->stepping) { |
---|
647 | printf("stepping\n"); |
---|
648 | breakpoint_found = 1; |
---|
649 | return; |
---|
650 | } |
---|
651 | } |
---|
652 | current_inferior = saved_inferior; |
---|
653 | |
---|
654 | |
---|
655 | } |
---|
656 | |
---|
657 | static void |
---|
658 | linux_set_inferior (void) |
---|
659 | { |
---|
660 | breakpoint_found = 0; |
---|
661 | for_each_inferior (&all_threads, set_breakpoint_inferior); |
---|
662 | if (!breakpoint_found) { |
---|
663 | breakpoint_found = 2; |
---|
664 | for_each_inferior (&all_threads, set_breakpoint_inferior); |
---|
665 | } |
---|
666 | } |
---|
667 | |
---|