1/*
2 * Copyright (c) 2004 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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53 Addr addr = 0;
54 if (!sys->kernelSymtab->findAddress(symbol, addr)) {
55 warn_once("Unable to find kernel symbol %s\n", symbol);
56 warn_once("Kernel not compiled with task_struct info; can't get "
57 "currently executing task/process/thread name/ids!\n");
58 return false;
59 }
60
61 data = tc->getVirtProxy().read<T>(addr, TheISA::GuestByteOrder);
62
63 return true;
64 }
65
66 public:
67 ThreadInfo(ThreadContext *_tc, Addr _pcbb = 0)
68 : tc(_tc), sys(tc->getSystemPtr()), pcbb(_pcbb)
69 {
70

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91 }
92
93 inline Addr
94 curTaskInfo(Addr thread_info = 0)
95 {
96 // Note that in Linux 4.10 the thread_info struct will no longer have a
97 // pointer to the task_struct for arm64. See:
98 // https://patchwork.kernel.org/patch/9333699/
99 int32_t offset = 0;
100 if (!get_data("thread_info_task", offset))
101 return 0;
102
103 if (!thread_info)
104 thread_info = curThreadInfo();
105
106 return tc->getVirtProxy().read<Addr>(thread_info + offset);
107 }
108
109 int32_t
110 curTaskPIDFromTaskStruct(Addr task_struct) {
111 int32_t offset = 0;
112 if (!get_data("task_struct_pid", offset))
113 return -1;
114
115 return tc->getVirtProxy().read<int32_t>(task_struct + offset);
116 }
117
118 int32_t
119 curTaskPID(Addr thread_info = 0)
120 {
121 return curTaskPIDFromTaskStruct(curTaskInfo(thread_info));
122 }
123
124 int32_t
125 curTaskTGIDFromTaskStruct(Addr task_struct)
126 {
127 int32_t offset = 0;
128 if (!get_data("task_struct_tgid", offset))
129 return -1;
130
131 return tc->getVirtProxy().read<int32_t>(task_struct + offset);
132 }
133
134 int32_t
135 curTaskTGID(Addr thread_info = 0)
136 {
137 return curTaskTGIDFromTaskStruct(curTaskInfo(thread_info));
138 }
139
140 int64_t
141 curTaskStartFromTaskStruct(Addr task_struct)
142 {
143 int32_t offset = 0;
144 if (!get_data("task_struct_start_time", offset))
145 return -1;
146
147 // start_time is actually of type timespec, but if we just
148 // grab the first long, we'll get the seconds out of it
149 return tc->getVirtProxy().read<int64_t>(task_struct + offset);
150 }
151
152 int64_t
153 curTaskStart(Addr thread_info = 0)
154 {
155 return curTaskStartFromTaskStruct(curTaskInfo(thread_info));
156 }
157
158 std::string
159 curTaskNameFromTaskStruct(Addr task_struct)
160 {
161 int32_t offset = 0;
162 int32_t size = 0;
163
164 if (!get_data("task_struct_comm", offset))
165 return "FailureIn_curTaskName";
166
167 if (!get_data("task_struct_comm_size", size))
168 return "FailureIn_curTaskName";
169
170 char buffer[size + 1];
171 tc->getVirtProxy().readString(buffer, task_struct + offset, size);
172
173 return buffer;
174 }
175
176 std::string
177 curTaskName(Addr thread_info = 0)
178 {
179 return curTaskNameFromTaskStruct(curTaskInfo(thread_info));
180 }
181
182 int32_t
183 curTaskMmFromTaskStruct(Addr task_struct)
184 {
185 int32_t offset;
186 if (!get_data("task_struct_mm", offset))
187 return -1;
188
189 return tc->getVirtProxy().read<int32_t>(task_struct + offset);
190 }
191
192 int32_t
193 curTaskMm(Addr thread_info = 0)
194 {
195 return curTaskMmFromTaskStruct(curTaskInfo(thread_info));
196 }
197};
198
199} // namespace Linux
200
201#endif // __ARCH_GENERIC_LINUX_THREADINFO_HH__