File: | src/gnu/usr.bin/clang/liblldbPluginDynamicLoader/../../../llvm/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DYLDRendezvous.cpp |
Warning: | line 156, column 9 Although the value stored to 'cursor' is used in the enclosing expression, the value is never actually read from 'cursor' |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | //===-- DYLDRendezvous.cpp ------------------------------------------------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | |
9 | #include "lldb/Core/Module.h" |
10 | #include "lldb/Symbol/ObjectFile.h" |
11 | #include "lldb/Symbol/Symbol.h" |
12 | #include "lldb/Symbol/SymbolContext.h" |
13 | #include "lldb/Target/Platform.h" |
14 | #include "lldb/Target/Process.h" |
15 | #include "lldb/Target/Target.h" |
16 | #include "lldb/Utility/ArchSpec.h" |
17 | #include "lldb/Utility/Log.h" |
18 | #include "lldb/Utility/Status.h" |
19 | |
20 | #include "llvm/Support/Path.h" |
21 | |
22 | #include "DYLDRendezvous.h" |
23 | |
24 | using namespace lldb; |
25 | using namespace lldb_private; |
26 | |
27 | /// Locates the address of the rendezvous structure. Returns the address on |
28 | /// success and LLDB_INVALID_ADDRESS on failure. |
29 | static addr_t ResolveRendezvousAddress(Process *process) { |
30 | Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER(1u << 3))); |
31 | addr_t info_location; |
32 | addr_t info_addr; |
33 | Status error; |
34 | |
35 | if (!process) { |
36 | LLDB_LOGF(log, "%s null process provided", __FUNCTION__)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s null process provided", __FUNCTION__ ); } while (0); |
37 | return LLDB_INVALID_ADDRESS0xffffffffffffffffULL; |
38 | } |
39 | |
40 | // Try to get it from our process. This might be a remote process and might |
41 | // grab it via some remote-specific mechanism. |
42 | info_location = process->GetImageInfoAddress(); |
43 | LLDB_LOGF(log, "%s info_location = 0x%" PRIx64, __FUNCTION__, info_location)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s info_location = 0x%" "llx", __FUNCTION__ , info_location); } while (0); |
44 | |
45 | // If the process fails to return an address, fall back to seeing if the |
46 | // local object file can help us find it. |
47 | if (info_location == LLDB_INVALID_ADDRESS0xffffffffffffffffULL) { |
48 | Target *target = &process->GetTarget(); |
49 | if (target) { |
50 | ObjectFile *obj_file = target->GetExecutableModule()->GetObjectFile(); |
51 | Address addr = obj_file->GetImageInfoAddress(target); |
52 | |
53 | if (addr.IsValid()) { |
54 | info_location = addr.GetLoadAddress(target); |
55 | LLDB_LOGF(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s resolved via direct object file approach to 0x%" "llx", __FUNCTION__, info_location); } while (0) |
56 | "%s resolved via direct object file approach to 0x%" PRIx64,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s resolved via direct object file approach to 0x%" "llx", __FUNCTION__, info_location); } while (0) |
57 | __FUNCTION__, info_location)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s resolved via direct object file approach to 0x%" "llx", __FUNCTION__, info_location); } while (0); |
58 | } else { |
59 | LLDB_LOGF(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - direct object file approach did not yield a " "valid address", __FUNCTION__); } while (0) |
60 | "%s FAILED - direct object file approach did not yield a "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - direct object file approach did not yield a " "valid address", __FUNCTION__); } while (0) |
61 | "valid address",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - direct object file approach did not yield a " "valid address", __FUNCTION__); } while (0) |
62 | __FUNCTION__)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - direct object file approach did not yield a " "valid address", __FUNCTION__); } while (0); |
63 | } |
64 | } |
65 | } |
66 | |
67 | if (info_location == LLDB_INVALID_ADDRESS0xffffffffffffffffULL) { |
68 | LLDB_LOGF(log, "%s FAILED - invalid info address", __FUNCTION__)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - invalid info address", __FUNCTION__ ); } while (0); |
69 | return LLDB_INVALID_ADDRESS0xffffffffffffffffULL; |
70 | } |
71 | |
72 | LLDB_LOGF(log, "%s reading pointer (%" PRIu32 " bytes) from 0x%" PRIx64,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s reading pointer (%" "u" " bytes) from 0x%" "llx", __FUNCTION__, process->GetAddressByteSize(), info_location ); } while (0) |
73 | __FUNCTION__, process->GetAddressByteSize(), info_location)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s reading pointer (%" "u" " bytes) from 0x%" "llx", __FUNCTION__, process->GetAddressByteSize(), info_location ); } while (0); |
74 | |
75 | info_addr = process->ReadPointerFromMemory(info_location, error); |
76 | if (error.Fail()) { |
77 | LLDB_LOGF(log, "%s FAILED - could not read from the info location: %s",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - could not read from the info location: %s" , __FUNCTION__, error.AsCString()); } while (0) |
78 | __FUNCTION__, error.AsCString())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - could not read from the info location: %s" , __FUNCTION__, error.AsCString()); } while (0); |
79 | return LLDB_INVALID_ADDRESS0xffffffffffffffffULL; |
80 | } |
81 | |
82 | if (info_addr == 0) { |
83 | LLDB_LOGF(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - the rendezvous address contained at 0x%" "llx" " returned a null value", __FUNCTION__, info_location) ; } while (0) |
84 | "%s FAILED - the rendezvous address contained at 0x%" PRIx64do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - the rendezvous address contained at 0x%" "llx" " returned a null value", __FUNCTION__, info_location) ; } while (0) |
85 | " returned a null value",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - the rendezvous address contained at 0x%" "llx" " returned a null value", __FUNCTION__, info_location) ; } while (0) |
86 | __FUNCTION__, info_location)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("%s FAILED - the rendezvous address contained at 0x%" "llx" " returned a null value", __FUNCTION__, info_location) ; } while (0); |
87 | return LLDB_INVALID_ADDRESS0xffffffffffffffffULL; |
88 | } |
89 | |
90 | return info_addr; |
91 | } |
92 | |
93 | DYLDRendezvous::DYLDRendezvous(Process *process) |
94 | : m_process(process), m_rendezvous_addr(LLDB_INVALID_ADDRESS0xffffffffffffffffULL), m_current(), |
95 | m_previous(), m_loaded_modules(), m_soentries(), m_added_soentries(), |
96 | m_removed_soentries() { |
97 | m_thread_info.valid = false; |
98 | UpdateExecutablePath(); |
99 | } |
100 | |
101 | void DYLDRendezvous::UpdateExecutablePath() { |
102 | if (m_process) { |
103 | Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER(1u << 3))); |
104 | Module *exe_mod = m_process->GetTarget().GetExecutableModulePointer(); |
105 | if (exe_mod) { |
106 | m_exe_file_spec = exe_mod->GetPlatformFileSpec(); |
107 | LLDB_LOGF(log, "DYLDRendezvous::%s exe module executable path set: '%s'",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s exe module executable path set: '%s'" , __FUNCTION__, m_exe_file_spec.GetCString()); } while (0) |
108 | __FUNCTION__, m_exe_file_spec.GetCString())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s exe module executable path set: '%s'" , __FUNCTION__, m_exe_file_spec.GetCString()); } while (0); |
109 | } else { |
110 | LLDB_LOGF(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s cannot cache exe module path: null " "executable module pointer", __FUNCTION__); } while (0) |
111 | "DYLDRendezvous::%s cannot cache exe module path: null "do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s cannot cache exe module path: null " "executable module pointer", __FUNCTION__); } while (0) |
112 | "executable module pointer",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s cannot cache exe module path: null " "executable module pointer", __FUNCTION__); } while (0) |
113 | __FUNCTION__)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s cannot cache exe module path: null " "executable module pointer", __FUNCTION__); } while (0); |
114 | } |
115 | } |
116 | } |
117 | |
118 | bool DYLDRendezvous::Resolve() { |
119 | Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER(1u << 3))); |
120 | |
121 | const size_t word_size = 4; |
122 | Rendezvous info; |
123 | size_t address_size; |
124 | size_t padding; |
125 | addr_t info_addr; |
126 | addr_t cursor; |
127 | |
128 | address_size = m_process->GetAddressByteSize(); |
129 | padding = address_size - word_size; |
130 | LLDB_LOGF(log,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s address size: %" "llu" ", padding %" "llu", __FUNCTION__, uint64_t(address_size ), uint64_t(padding)); } while (0) |
131 | "DYLDRendezvous::%s address size: %" PRIu64 ", padding %" PRIu64,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s address size: %" "llu" ", padding %" "llu", __FUNCTION__, uint64_t(address_size ), uint64_t(padding)); } while (0) |
132 | __FUNCTION__, uint64_t(address_size), uint64_t(padding))do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s address size: %" "llu" ", padding %" "llu", __FUNCTION__, uint64_t(address_size ), uint64_t(padding)); } while (0); |
133 | |
134 | if (m_rendezvous_addr == LLDB_INVALID_ADDRESS0xffffffffffffffffULL) |
135 | cursor = info_addr = ResolveRendezvousAddress(m_process); |
136 | else |
137 | cursor = info_addr = m_rendezvous_addr; |
138 | LLDB_LOGF(log, "DYLDRendezvous::%s cursor = 0x%" PRIx64, __FUNCTION__,do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s cursor = 0x%" "llx" , __FUNCTION__, cursor); } while (0) |
139 | cursor)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("DYLDRendezvous::%s cursor = 0x%" "llx" , __FUNCTION__, cursor); } while (0); |
140 | |
141 | if (cursor == LLDB_INVALID_ADDRESS0xffffffffffffffffULL) |
142 | return false; |
143 | |
144 | if (!(cursor = ReadWord(cursor, &info.version, word_size))) |
145 | return false; |
146 | |
147 | if (!(cursor = ReadPointer(cursor + padding, &info.map_addr))) |
148 | return false; |
149 | |
150 | if (!(cursor = ReadPointer(cursor, &info.brk))) |
151 | return false; |
152 | |
153 | if (!(cursor = ReadWord(cursor, &info.state, word_size))) |
154 | return false; |
155 | |
156 | if (!(cursor = ReadPointer(cursor + padding, &info.ldbase))) |
Although the value stored to 'cursor' is used in the enclosing expression, the value is never actually read from 'cursor' | |
157 | return false; |
158 | |
159 | // The rendezvous was successfully read. Update our internal state. |
160 | m_rendezvous_addr = info_addr; |
161 | m_previous = m_current; |
162 | m_current = info; |
163 | |
164 | if (m_current.map_addr == 0) |
165 | return false; |
166 | |
167 | if (UpdateSOEntriesFromRemote()) |
168 | return true; |
169 | |
170 | return UpdateSOEntries(); |
171 | } |
172 | |
173 | bool DYLDRendezvous::IsValid() { |
174 | return m_rendezvous_addr != LLDB_INVALID_ADDRESS0xffffffffffffffffULL; |
175 | } |
176 | |
177 | DYLDRendezvous::RendezvousAction DYLDRendezvous::GetAction() const { |
178 | switch (m_current.state) { |
179 | |
180 | case eConsistent: |
181 | switch (m_previous.state) { |
182 | // When the previous and current states are consistent this is the first |
183 | // time we have been asked to update. Just take a snapshot of the |
184 | // currently loaded modules. |
185 | case eConsistent: |
186 | return eTakeSnapshot; |
187 | // If we are about to add or remove a shared object clear out the current |
188 | // state and take a snapshot of the currently loaded images. |
189 | case eAdd: |
190 | return eAddModules; |
191 | case eDelete: |
192 | return eRemoveModules; |
193 | } |
194 | break; |
195 | |
196 | case eAdd: |
197 | case eDelete: |
198 | // Some versions of the android dynamic linker might send two |
199 | // notifications with state == eAdd back to back. Ignore them until we |
200 | // get an eConsistent notification. |
201 | if (!(m_previous.state == eConsistent || |
202 | (m_previous.state == eAdd && m_current.state == eDelete))) |
203 | return eNoAction; |
204 | |
205 | return eTakeSnapshot; |
206 | } |
207 | |
208 | return eNoAction; |
209 | } |
210 | |
211 | bool DYLDRendezvous::UpdateSOEntriesFromRemote() { |
212 | auto action = GetAction(); |
213 | |
214 | if (action == eNoAction) |
215 | return false; |
216 | |
217 | if (action == eTakeSnapshot) { |
218 | m_added_soentries.clear(); |
219 | m_removed_soentries.clear(); |
220 | // We already have the loaded list from the previous update so no need to |
221 | // find all the modules again. |
222 | if (!m_loaded_modules.m_list.empty()) |
223 | return true; |
224 | } |
225 | |
226 | llvm::Expected<LoadedModuleInfoList> module_list = |
227 | m_process->GetLoadedModuleList(); |
228 | if (!module_list) { |
229 | llvm::consumeError(module_list.takeError()); |
230 | return false; |
231 | } |
232 | |
233 | switch (action) { |
234 | case eTakeSnapshot: |
235 | m_soentries.clear(); |
236 | return SaveSOEntriesFromRemote(*module_list); |
237 | case eAddModules: |
238 | return AddSOEntriesFromRemote(*module_list); |
239 | case eRemoveModules: |
240 | return RemoveSOEntriesFromRemote(*module_list); |
241 | case eNoAction: |
242 | return false; |
243 | } |
244 | llvm_unreachable("Fully covered switch above!")__builtin_unreachable(); |
245 | } |
246 | |
247 | bool DYLDRendezvous::UpdateSOEntries() { |
248 | switch (GetAction()) { |
249 | case eTakeSnapshot: |
250 | m_soentries.clear(); |
251 | m_added_soentries.clear(); |
252 | m_removed_soentries.clear(); |
253 | return TakeSnapshot(m_soentries); |
254 | case eAddModules: |
255 | return AddSOEntries(); |
256 | case eRemoveModules: |
257 | return RemoveSOEntries(); |
258 | case eNoAction: |
259 | return false; |
260 | } |
261 | llvm_unreachable("Fully covered switch above!")__builtin_unreachable(); |
262 | } |
263 | |
264 | bool DYLDRendezvous::FillSOEntryFromModuleInfo( |
265 | LoadedModuleInfoList::LoadedModuleInfo const &modInfo, SOEntry &entry) { |
266 | addr_t link_map_addr; |
267 | addr_t base_addr; |
268 | addr_t dyn_addr; |
269 | std::string name; |
270 | |
271 | if (!modInfo.get_link_map(link_map_addr) || !modInfo.get_base(base_addr) || |
272 | !modInfo.get_dynamic(dyn_addr) || !modInfo.get_name(name)) |
273 | return false; |
274 | |
275 | entry.link_addr = link_map_addr; |
276 | entry.base_addr = base_addr; |
277 | entry.dyn_addr = dyn_addr; |
278 | |
279 | entry.file_spec.SetFile(name, FileSpec::Style::native); |
280 | |
281 | UpdateBaseAddrIfNecessary(entry, name); |
282 | |
283 | // not needed if we're using ModuleInfos |
284 | entry.next = 0; |
285 | entry.prev = 0; |
286 | entry.path_addr = 0; |
287 | |
288 | return true; |
289 | } |
290 | |
291 | bool DYLDRendezvous::SaveSOEntriesFromRemote( |
292 | const LoadedModuleInfoList &module_list) { |
293 | for (auto const &modInfo : module_list.m_list) { |
294 | SOEntry entry; |
295 | if (!FillSOEntryFromModuleInfo(modInfo, entry)) |
296 | return false; |
297 | |
298 | // Only add shared libraries and not the executable. |
299 | if (!SOEntryIsMainExecutable(entry)) |
300 | m_soentries.push_back(entry); |
301 | } |
302 | |
303 | m_loaded_modules = module_list; |
304 | return true; |
305 | } |
306 | |
307 | bool DYLDRendezvous::AddSOEntriesFromRemote( |
308 | const LoadedModuleInfoList &module_list) { |
309 | for (auto const &modInfo : module_list.m_list) { |
310 | bool found = false; |
311 | for (auto const &existing : m_loaded_modules.m_list) { |
312 | if (modInfo == existing) { |
313 | found = true; |
314 | break; |
315 | } |
316 | } |
317 | |
318 | if (found) |
319 | continue; |
320 | |
321 | SOEntry entry; |
322 | if (!FillSOEntryFromModuleInfo(modInfo, entry)) |
323 | return false; |
324 | |
325 | // Only add shared libraries and not the executable. |
326 | if (!SOEntryIsMainExecutable(entry)) { |
327 | m_soentries.push_back(entry); |
328 | m_added_soentries.push_back(entry); |
329 | } |
330 | } |
331 | |
332 | m_loaded_modules = module_list; |
333 | return true; |
334 | } |
335 | |
336 | bool DYLDRendezvous::RemoveSOEntriesFromRemote( |
337 | const LoadedModuleInfoList &module_list) { |
338 | for (auto const &existing : m_loaded_modules.m_list) { |
339 | bool found = false; |
340 | for (auto const &modInfo : module_list.m_list) { |
341 | if (modInfo == existing) { |
342 | found = true; |
343 | break; |
344 | } |
345 | } |
346 | |
347 | if (found) |
348 | continue; |
349 | |
350 | SOEntry entry; |
351 | if (!FillSOEntryFromModuleInfo(existing, entry)) |
352 | return false; |
353 | |
354 | // Only add shared libraries and not the executable. |
355 | if (!SOEntryIsMainExecutable(entry)) { |
356 | auto pos = std::find(m_soentries.begin(), m_soentries.end(), entry); |
357 | if (pos == m_soentries.end()) |
358 | return false; |
359 | |
360 | m_soentries.erase(pos); |
361 | m_removed_soentries.push_back(entry); |
362 | } |
363 | } |
364 | |
365 | m_loaded_modules = module_list; |
366 | return true; |
367 | } |
368 | |
369 | bool DYLDRendezvous::AddSOEntries() { |
370 | SOEntry entry; |
371 | iterator pos; |
372 | |
373 | assert(m_previous.state == eAdd)((void)0); |
374 | |
375 | if (m_current.map_addr == 0) |
376 | return false; |
377 | |
378 | for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next) { |
379 | if (!ReadSOEntryFromMemory(cursor, entry)) |
380 | return false; |
381 | |
382 | // Only add shared libraries and not the executable. |
383 | if (SOEntryIsMainExecutable(entry)) |
384 | continue; |
385 | |
386 | pos = std::find(m_soentries.begin(), m_soentries.end(), entry); |
387 | if (pos == m_soentries.end()) { |
388 | m_soentries.push_back(entry); |
389 | m_added_soentries.push_back(entry); |
390 | } |
391 | } |
392 | |
393 | return true; |
394 | } |
395 | |
396 | bool DYLDRendezvous::RemoveSOEntries() { |
397 | SOEntryList entry_list; |
398 | iterator pos; |
399 | |
400 | assert(m_previous.state == eDelete)((void)0); |
401 | |
402 | if (!TakeSnapshot(entry_list)) |
403 | return false; |
404 | |
405 | for (iterator I = begin(); I != end(); ++I) { |
406 | pos = std::find(entry_list.begin(), entry_list.end(), *I); |
407 | if (pos == entry_list.end()) |
408 | m_removed_soentries.push_back(*I); |
409 | } |
410 | |
411 | m_soentries = entry_list; |
412 | return true; |
413 | } |
414 | |
415 | bool DYLDRendezvous::SOEntryIsMainExecutable(const SOEntry &entry) { |
416 | // On some systes the executable is indicated by an empty path in the entry. |
417 | // On others it is the full path to the executable. |
418 | |
419 | auto triple = m_process->GetTarget().GetArchitecture().GetTriple(); |
420 | switch (triple.getOS()) { |
421 | case llvm::Triple::FreeBSD: |
422 | case llvm::Triple::NetBSD: |
423 | case llvm::Triple::OpenBSD: |
424 | return entry.file_spec == m_exe_file_spec; |
425 | case llvm::Triple::Linux: |
426 | if (triple.isAndroid()) |
427 | return entry.file_spec == m_exe_file_spec; |
428 | return !entry.file_spec; |
429 | default: |
430 | return false; |
431 | } |
432 | } |
433 | |
434 | bool DYLDRendezvous::TakeSnapshot(SOEntryList &entry_list) { |
435 | SOEntry entry; |
436 | |
437 | if (m_current.map_addr == 0) |
438 | return false; |
439 | |
440 | // Clear previous entries since we are about to obtain an up to date list. |
441 | entry_list.clear(); |
442 | |
443 | for (addr_t cursor = m_current.map_addr; cursor != 0; cursor = entry.next) { |
444 | if (!ReadSOEntryFromMemory(cursor, entry)) |
445 | return false; |
446 | |
447 | // Only add shared libraries and not the executable. |
448 | if (SOEntryIsMainExecutable(entry)) |
449 | continue; |
450 | |
451 | entry_list.push_back(entry); |
452 | } |
453 | |
454 | return true; |
455 | } |
456 | |
457 | addr_t DYLDRendezvous::ReadWord(addr_t addr, uint64_t *dst, size_t size) { |
458 | Status error; |
459 | |
460 | *dst = m_process->ReadUnsignedIntegerFromMemory(addr, size, 0, error); |
461 | if (error.Fail()) |
462 | return 0; |
463 | |
464 | return addr + size; |
465 | } |
466 | |
467 | addr_t DYLDRendezvous::ReadPointer(addr_t addr, addr_t *dst) { |
468 | Status error; |
469 | |
470 | *dst = m_process->ReadPointerFromMemory(addr, error); |
471 | if (error.Fail()) |
472 | return 0; |
473 | |
474 | return addr + m_process->GetAddressByteSize(); |
475 | } |
476 | |
477 | std::string DYLDRendezvous::ReadStringFromMemory(addr_t addr) { |
478 | std::string str; |
479 | Status error; |
480 | |
481 | if (addr == LLDB_INVALID_ADDRESS0xffffffffffffffffULL) |
482 | return std::string(); |
483 | |
484 | m_process->ReadCStringFromMemory(addr, str, error); |
485 | |
486 | return str; |
487 | } |
488 | |
489 | // Returns true if the load bias reported by the linker is incorrect for the |
490 | // given entry. This function is used to handle cases where we want to work |
491 | // around a bug in the system linker. |
492 | static bool isLoadBiasIncorrect(Target &target, const std::string &file_path) { |
493 | // On Android L (API 21, 22) the load address of the "/system/bin/linker" |
494 | // isn't filled in correctly. |
495 | unsigned os_major = target.GetPlatform()->GetOSVersion().getMajor(); |
496 | return target.GetArchitecture().GetTriple().isAndroid() && |
497 | (os_major == 21 || os_major == 22) && |
498 | (file_path == "/system/bin/linker" || |
499 | file_path == "/system/bin/linker64"); |
500 | } |
501 | |
502 | void DYLDRendezvous::UpdateBaseAddrIfNecessary(SOEntry &entry, |
503 | std::string const &file_path) { |
504 | // If the load bias reported by the linker is incorrect then fetch the load |
505 | // address of the file from the proc file system. |
506 | if (isLoadBiasIncorrect(m_process->GetTarget(), file_path)) { |
507 | lldb::addr_t load_addr = LLDB_INVALID_ADDRESS0xffffffffffffffffULL; |
508 | bool is_loaded = false; |
509 | Status error = |
510 | m_process->GetFileLoadAddress(entry.file_spec, is_loaded, load_addr); |
511 | if (error.Success() && is_loaded) |
512 | entry.base_addr = load_addr; |
513 | } |
514 | } |
515 | |
516 | bool DYLDRendezvous::ReadSOEntryFromMemory(lldb::addr_t addr, SOEntry &entry) { |
517 | entry.clear(); |
518 | |
519 | entry.link_addr = addr; |
520 | |
521 | if (!(addr = ReadPointer(addr, &entry.base_addr))) |
522 | return false; |
523 | |
524 | // mips adds an extra load offset field to the link map struct on FreeBSD and |
525 | // NetBSD (need to validate other OSes). |
526 | // http://svnweb.freebsd.org/base/head/sys/sys/link_elf.h?revision=217153&view=markup#l57 |
527 | const ArchSpec &arch = m_process->GetTarget().GetArchitecture(); |
528 | if ((arch.GetTriple().getOS() == llvm::Triple::FreeBSD || |
529 | arch.GetTriple().getOS() == llvm::Triple::NetBSD) && |
530 | arch.IsMIPS()) { |
531 | addr_t mips_l_offs; |
532 | if (!(addr = ReadPointer(addr, &mips_l_offs))) |
533 | return false; |
534 | if (mips_l_offs != 0 && mips_l_offs != entry.base_addr) |
535 | return false; |
536 | } |
537 | |
538 | if (!(addr = ReadPointer(addr, &entry.path_addr))) |
539 | return false; |
540 | |
541 | if (!(addr = ReadPointer(addr, &entry.dyn_addr))) |
542 | return false; |
543 | |
544 | if (!(addr = ReadPointer(addr, &entry.next))) |
545 | return false; |
546 | |
547 | if (!(addr = ReadPointer(addr, &entry.prev))) |
548 | return false; |
549 | |
550 | std::string file_path = ReadStringFromMemory(entry.path_addr); |
551 | entry.file_spec.SetFile(file_path, FileSpec::Style::native); |
552 | |
553 | UpdateBaseAddrIfNecessary(entry, file_path); |
554 | |
555 | return true; |
556 | } |
557 | |
558 | bool DYLDRendezvous::FindMetadata(const char *name, PThreadField field, |
559 | uint32_t &value) { |
560 | Target &target = m_process->GetTarget(); |
561 | |
562 | SymbolContextList list; |
563 | target.GetImages().FindSymbolsWithNameAndType(ConstString(name), |
564 | eSymbolTypeAny, list); |
565 | if (list.IsEmpty()) |
566 | return false; |
567 | |
568 | Address address = list[0].symbol->GetAddress(); |
569 | addr_t addr = address.GetLoadAddress(&target); |
570 | if (addr == LLDB_INVALID_ADDRESS0xffffffffffffffffULL) |
571 | return false; |
572 | |
573 | Status error; |
574 | value = (uint32_t)m_process->ReadUnsignedIntegerFromMemory( |
575 | addr + field * sizeof(uint32_t), sizeof(uint32_t), 0, error); |
576 | if (error.Fail()) |
577 | return false; |
578 | |
579 | if (field == eSize) |
580 | value /= 8; // convert bits to bytes |
581 | |
582 | return true; |
583 | } |
584 | |
585 | const DYLDRendezvous::ThreadInfo &DYLDRendezvous::GetThreadInfo() { |
586 | if (!m_thread_info.valid) { |
587 | bool ok = true; |
588 | |
589 | ok &= FindMetadata("_thread_db_pthread_dtvp", eOffset, |
590 | m_thread_info.dtv_offset); |
591 | ok &= |
592 | FindMetadata("_thread_db_dtv_dtv", eSize, m_thread_info.dtv_slot_size); |
593 | ok &= FindMetadata("_thread_db_link_map_l_tls_modid", eOffset, |
594 | m_thread_info.modid_offset); |
595 | ok &= FindMetadata("_thread_db_dtv_t_pointer_val", eOffset, |
596 | m_thread_info.tls_offset); |
597 | |
598 | if (ok) |
599 | m_thread_info.valid = true; |
600 | } |
601 | |
602 | return m_thread_info; |
603 | } |
604 | |
605 | void DYLDRendezvous::DumpToLog(Log *log) const { |
606 | int state = GetState(); |
607 | |
608 | if (!log) |
609 | return; |
610 | |
611 | log->PutCString("DYLDRendezvous:"); |
612 | LLDB_LOGF(log, " Address: %" PRIx64, GetRendezvousAddress())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Address: %" "llx", GetRendezvousAddress ()); } while (0); |
613 | LLDB_LOGF(log, " Version: %" PRIu64, GetVersion())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Version: %" "llu", GetVersion()) ; } while (0); |
614 | LLDB_LOGF(log, " Link : %" PRIx64, GetLinkMapAddress())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Link : %" "llx", GetLinkMapAddress ()); } while (0); |
615 | LLDB_LOGF(log, " Break : %" PRIx64, GetBreakAddress())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Break : %" "llx", GetBreakAddress ()); } while (0); |
616 | LLDB_LOGF(log, " LDBase : %" PRIx64, GetLDBase())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" LDBase : %" "llx", GetLDBase()); } while (0); |
617 | LLDB_LOGF(log, " State : %s",do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
618 | (state == eConsistent)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
619 | ? "consistent"do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
620 | : (state == eAdd) ? "add"do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0) |
621 | : (state == eDelete) ? "delete" : "unknown")do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" State : %s", (state == eConsistent ) ? "consistent" : (state == eAdd) ? "add" : (state == eDelete ) ? "delete" : "unknown"); } while (0); |
622 | |
623 | iterator I = begin(); |
624 | iterator E = end(); |
625 | |
626 | if (I != E) |
627 | log->PutCString("DYLDRendezvous SOEntries:"); |
628 | |
629 | for (int i = 1; I != E; ++I, ++i) { |
630 | LLDB_LOGF(log, "\n SOEntry [%d] %s", i, I->file_spec.GetCString())do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf("\n SOEntry [%d] %s", i, I->file_spec .GetCString()); } while (0); |
631 | LLDB_LOGF(log, " Base : %" PRIx64, I->base_addr)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Base : %" "llx", I->base_addr ); } while (0); |
632 | LLDB_LOGF(log, " Path : %" PRIx64, I->path_addr)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Path : %" "llx", I->path_addr ); } while (0); |
633 | LLDB_LOGF(log, " Dyn : %" PRIx64, I->dyn_addr)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Dyn : %" "llx", I->dyn_addr ); } while (0); |
634 | LLDB_LOGF(log, " Next : %" PRIx64, I->next)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Next : %" "llx", I->next); } while (0); |
635 | LLDB_LOGF(log, " Prev : %" PRIx64, I->prev)do { ::lldb_private::Log *log_private = (log); if (log_private ) log_private->Printf(" Prev : %" "llx", I->prev); } while (0); |
636 | } |
637 | } |