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 CopyOut(tc, &data, addr, sizeof(T));
62
63 data = TheISA::gtoh(data);
64
65 return true;
66 }
67
68 public:
69 ThreadInfo(ThreadContext *_tc, Addr _pcbb = 0)
70 : tc(_tc), sys(tc->getSystemPtr()), pcbb(_pcbb)
71 {
72

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93 }
94
95 inline Addr
96 curTaskInfo(Addr thread_info = 0)
97 {
98 // Note that in Linux 4.10 the thread_info struct will no longer have a
99 // pointer to the task_struct for arm64. See:
100 // https://patchwork.kernel.org/patch/9333699/
101 int32_t offset;
102 if (!get_data("thread_info_task", offset))
103 return 0;
104
105 if (!thread_info)
106 thread_info = curThreadInfo();
107
108 Addr addr;
109 CopyOut(tc, &addr, thread_info + offset, sizeof(addr));
110
111 return addr;
112 }
113
114 int32_t
115 curTaskPIDFromTaskStruct(Addr task_struct) {
116 int32_t offset;
117 if (!get_data("task_struct_pid", offset))
118 return -1;
119
120 int32_t pid;
121 CopyOut(tc, &pid, task_struct + offset, sizeof(pid));
122
123 return pid;
124 }
125
126 int32_t
127 curTaskPID(Addr thread_info = 0)
128 {
129 return curTaskPIDFromTaskStruct(curTaskInfo(thread_info));
130 }
131
132 int32_t
133 curTaskTGIDFromTaskStruct(Addr task_struct)
134 {
135 int32_t offset;
136 if (!get_data("task_struct_tgid", offset))
137 return -1;
138
139 int32_t tgid;
140 CopyOut(tc, &tgid, task_struct + offset, sizeof(tgid));
141
142 return tgid;
143 }
144
145 int32_t
146 curTaskTGID(Addr thread_info = 0)
147 {
148 return curTaskTGIDFromTaskStruct(curTaskInfo(thread_info));
149 }
150
151 int64_t
152 curTaskStartFromTaskStruct(Addr task_struct)
153 {
154 int32_t offset;
155 if (!get_data("task_struct_start_time", offset))
156 return -1;
157
158 int64_t data;
159 // start_time is actually of type timespec, but if we just
160 // grab the first long, we'll get the seconds out of it
161 CopyOut(tc, &data, task_struct + offset, sizeof(data));
162
163 return data;
164 }
165
166 int64_t
167 curTaskStart(Addr thread_info = 0)
168 {
169 return curTaskStartFromTaskStruct(curTaskInfo(thread_info));
170 }
171
172 std::string
173 curTaskNameFromTaskStruct(Addr task_struct)
174 {
175 int32_t offset;
176 int32_t size;
177
178 if (!get_data("task_struct_comm", offset))
179 return "FailureIn_curTaskName";
180
181 if (!get_data("task_struct_comm_size", size))
182 return "FailureIn_curTaskName";
183
184 char buffer[size + 1];
185 CopyStringOut(tc, buffer, task_struct + offset, size);
186
187 return buffer;
188 }
189
190 std::string
191 curTaskName(Addr thread_info = 0)
192 {
193 return curTaskNameFromTaskStruct(curTaskInfo(thread_info));
194 }
195
196 int32_t
197 curTaskMmFromTaskStruct(Addr task_struct)
198 {
199 int32_t offset;
200 if (!get_data("task_struct_mm", offset))
201 return -1;
202
203 int32_t mm_ptr;
204 CopyOut(tc, &mm_ptr, task_struct + offset, sizeof(mm_ptr));
205
206 return mm_ptr;
207 }
208
209 int32_t
210 curTaskMm(Addr thread_info = 0)
211 {
212 return curTaskMmFromTaskStruct(curTaskInfo(thread_info));
213 }
214};
215
216} // namespace Linux
217
218#endif // __ARCH_GENERIC_LINUX_THREADINFO_HH__