xref: /llvm-project/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp (revision 85bc498826d4dac4b64f7b02659f6ec52f11c223)
1 //===-- ThreadElfCore.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/Target/RegisterContext.h"
10 #include "lldb/Target/StopInfo.h"
11 #include "lldb/Target/Target.h"
12 #include "lldb/Target/Unwind.h"
13 #include "lldb/Utility/DataExtractor.h"
14 #include "lldb/Utility/LLDBLog.h"
15 #include "lldb/Utility/Log.h"
16 
17 #include "Plugins/Process/Utility/RegisterContextFreeBSD_i386.h"
18 #include "Plugins/Process/Utility/RegisterContextFreeBSD_mips64.h"
19 #include "Plugins/Process/Utility/RegisterContextFreeBSD_powerpc.h"
20 #include "Plugins/Process/Utility/RegisterContextFreeBSD_x86_64.h"
21 #include "Plugins/Process/Utility/RegisterContextLinux_i386.h"
22 #include "Plugins/Process/Utility/RegisterContextLinux_s390x.h"
23 #include "Plugins/Process/Utility/RegisterContextLinux_x86_64.h"
24 #include "Plugins/Process/Utility/RegisterContextNetBSD_i386.h"
25 #include "Plugins/Process/Utility/RegisterContextNetBSD_x86_64.h"
26 #include "Plugins/Process/Utility/RegisterContextOpenBSD_i386.h"
27 #include "Plugins/Process/Utility/RegisterContextOpenBSD_x86_64.h"
28 #include "Plugins/Process/Utility/RegisterInfoPOSIX_arm.h"
29 #include "Plugins/Process/Utility/RegisterInfoPOSIX_arm64.h"
30 #include "Plugins/Process/Utility/RegisterInfoPOSIX_ppc64le.h"
31 #include "ProcessElfCore.h"
32 #include "RegisterContextPOSIXCore_arm.h"
33 #include "RegisterContextPOSIXCore_arm64.h"
34 #include "RegisterContextPOSIXCore_mips64.h"
35 #include "RegisterContextPOSIXCore_powerpc.h"
36 #include "RegisterContextPOSIXCore_ppc64le.h"
37 #include "RegisterContextPOSIXCore_s390x.h"
38 #include "RegisterContextPOSIXCore_x86_64.h"
39 #include "ThreadElfCore.h"
40 
41 #include <memory>
42 
43 using namespace lldb;
44 using namespace lldb_private;
45 
46 // Construct a Thread object with given data
47 ThreadElfCore::ThreadElfCore(Process &process, const ThreadData &td)
48     : Thread(process, td.tid), m_thread_name(td.name), m_thread_reg_ctx_sp(),
49       m_signo(td.signo), m_code(td.code), m_gpregset_data(td.gpregset),
50       m_notes(td.notes) {}
51 
52 ThreadElfCore::~ThreadElfCore() { DestroyThread(); }
53 
54 void ThreadElfCore::RefreshStateAfterStop() {
55   GetRegisterContext()->InvalidateIfNeeded(false);
56 }
57 
58 RegisterContextSP ThreadElfCore::GetRegisterContext() {
59   if (!m_reg_context_sp) {
60     m_reg_context_sp = CreateRegisterContextForFrame(nullptr);
61   }
62   return m_reg_context_sp;
63 }
64 
65 RegisterContextSP
66 ThreadElfCore::CreateRegisterContextForFrame(StackFrame *frame) {
67   RegisterContextSP reg_ctx_sp;
68   uint32_t concrete_frame_idx = 0;
69   Log *log = GetLog(LLDBLog::Thread);
70 
71   if (frame)
72     concrete_frame_idx = frame->GetConcreteFrameIndex();
73 
74   if (concrete_frame_idx == 0) {
75     if (m_thread_reg_ctx_sp)
76       return m_thread_reg_ctx_sp;
77 
78     ProcessElfCore *process = static_cast<ProcessElfCore *>(GetProcess().get());
79     ArchSpec arch = process->GetArchitecture();
80     RegisterInfoInterface *reg_interface = nullptr;
81 
82     switch (arch.GetTriple().getOS()) {
83     case llvm::Triple::FreeBSD: {
84       switch (arch.GetMachine()) {
85       case llvm::Triple::aarch64:
86       case llvm::Triple::arm:
87         break;
88       case llvm::Triple::ppc:
89         reg_interface = new RegisterContextFreeBSD_powerpc32(arch);
90         break;
91       case llvm::Triple::ppc64:
92         reg_interface = new RegisterContextFreeBSD_powerpc64(arch);
93         break;
94       case llvm::Triple::mips64:
95         reg_interface = new RegisterContextFreeBSD_mips64(arch);
96         break;
97       case llvm::Triple::x86:
98         reg_interface = new RegisterContextFreeBSD_i386(arch);
99         break;
100       case llvm::Triple::x86_64:
101         reg_interface = new RegisterContextFreeBSD_x86_64(arch);
102         break;
103       default:
104         break;
105       }
106       break;
107     }
108 
109     case llvm::Triple::NetBSD: {
110       switch (arch.GetMachine()) {
111       case llvm::Triple::aarch64:
112         break;
113       case llvm::Triple::x86:
114         reg_interface = new RegisterContextNetBSD_i386(arch);
115         break;
116       case llvm::Triple::x86_64:
117         reg_interface = new RegisterContextNetBSD_x86_64(arch);
118         break;
119       default:
120         break;
121       }
122       break;
123     }
124 
125     case llvm::Triple::Linux: {
126       switch (arch.GetMachine()) {
127       case llvm::Triple::aarch64:
128         break;
129       case llvm::Triple::ppc64le:
130         reg_interface = new RegisterInfoPOSIX_ppc64le(arch);
131         break;
132       case llvm::Triple::systemz:
133         reg_interface = new RegisterContextLinux_s390x(arch);
134         break;
135       case llvm::Triple::x86:
136         reg_interface = new RegisterContextLinux_i386(arch);
137         break;
138       case llvm::Triple::x86_64:
139         reg_interface = new RegisterContextLinux_x86_64(arch);
140         break;
141       default:
142         break;
143       }
144       break;
145     }
146 
147     case llvm::Triple::OpenBSD: {
148       switch (arch.GetMachine()) {
149       case llvm::Triple::aarch64:
150         break;
151       case llvm::Triple::x86:
152         reg_interface = new RegisterContextOpenBSD_i386(arch);
153         break;
154       case llvm::Triple::x86_64:
155         reg_interface = new RegisterContextOpenBSD_x86_64(arch);
156         break;
157       default:
158         break;
159       }
160       break;
161     }
162 
163     default:
164       break;
165     }
166 
167     if (!reg_interface && arch.GetMachine() != llvm::Triple::aarch64 &&
168         arch.GetMachine() != llvm::Triple::arm) {
169       LLDB_LOGF(log, "elf-core::%s:: Architecture(%d) or OS(%d) not supported",
170                 __FUNCTION__, arch.GetMachine(), arch.GetTriple().getOS());
171       assert(false && "Architecture or OS not supported");
172     }
173 
174     switch (arch.GetMachine()) {
175     case llvm::Triple::aarch64:
176       m_thread_reg_ctx_sp = RegisterContextCorePOSIX_arm64::Create(
177           *this, arch, m_gpregset_data, m_notes);
178       break;
179     case llvm::Triple::arm:
180       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_arm>(
181           *this, std::make_unique<RegisterInfoPOSIX_arm>(arch), m_gpregset_data,
182           m_notes);
183       break;
184     case llvm::Triple::mipsel:
185     case llvm::Triple::mips:
186       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_mips64>(
187           *this, reg_interface, m_gpregset_data, m_notes);
188       break;
189     case llvm::Triple::mips64:
190     case llvm::Triple::mips64el:
191       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_mips64>(
192           *this, reg_interface, m_gpregset_data, m_notes);
193       break;
194     case llvm::Triple::ppc:
195     case llvm::Triple::ppc64:
196       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_powerpc>(
197           *this, reg_interface, m_gpregset_data, m_notes);
198       break;
199     case llvm::Triple::ppc64le:
200       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_ppc64le>(
201           *this, reg_interface, m_gpregset_data, m_notes);
202       break;
203     case llvm::Triple::systemz:
204       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_s390x>(
205           *this, reg_interface, m_gpregset_data, m_notes);
206       break;
207     case llvm::Triple::x86:
208     case llvm::Triple::x86_64:
209       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_x86_64>(
210           *this, reg_interface, m_gpregset_data, m_notes);
211       break;
212     default:
213       break;
214     }
215 
216     reg_ctx_sp = m_thread_reg_ctx_sp;
217   } else {
218     reg_ctx_sp = GetUnwinder().CreateRegisterContextForFrame(frame);
219   }
220   return reg_ctx_sp;
221 }
222 
223 bool ThreadElfCore::CalculateStopInfo() {
224   ProcessSP process_sp(GetProcess());
225   if (!process_sp)
226     return false;
227 
228   SetStopInfo(StopInfo::CreateStopReasonWithSignal(
229       *this, m_signo, /*description=*/nullptr, m_code));
230   return true;
231 }
232 
233 // Parse PRSTATUS from NOTE entry
234 ELFLinuxPrStatus::ELFLinuxPrStatus() {
235   memset(this, 0, sizeof(ELFLinuxPrStatus));
236 }
237 
238 size_t ELFLinuxPrStatus::GetSize(const lldb_private::ArchSpec &arch) {
239   constexpr size_t mips_linux_pr_status_size_o32 = 96;
240   constexpr size_t mips_linux_pr_status_size_n32 = 72;
241   constexpr size_t num_ptr_size_members = 10;
242   if (arch.IsMIPS()) {
243     std::string abi = arch.GetTargetABI();
244     assert(!abi.empty() && "ABI is not set");
245     if (!abi.compare("n64"))
246       return sizeof(ELFLinuxPrStatus);
247     else if (!abi.compare("o32"))
248       return mips_linux_pr_status_size_o32;
249     // N32 ABI
250     return mips_linux_pr_status_size_n32;
251   }
252   switch (arch.GetCore()) {
253   case lldb_private::ArchSpec::eCore_x86_32_i386:
254   case lldb_private::ArchSpec::eCore_x86_32_i486:
255     return 72;
256   default:
257     if (arch.GetAddressByteSize() == 8)
258       return sizeof(ELFLinuxPrStatus);
259     else
260       return sizeof(ELFLinuxPrStatus) - num_ptr_size_members * 4;
261   }
262 }
263 
264 Status ELFLinuxPrStatus::Parse(const DataExtractor &data,
265                                const ArchSpec &arch) {
266   Status error;
267   if (GetSize(arch) > data.GetByteSize()) {
268     error.SetErrorStringWithFormat(
269         "NT_PRSTATUS size should be %zu, but the remaining bytes are: %" PRIu64,
270         GetSize(arch), data.GetByteSize());
271     return error;
272   }
273 
274   // Read field by field to correctly account for endianess of both the core
275   // dump and the platform running lldb.
276   offset_t offset = 0;
277   si_signo = data.GetU32(&offset);
278   si_code = data.GetU32(&offset);
279   si_errno = data.GetU32(&offset);
280 
281   pr_cursig = data.GetU16(&offset);
282   offset += 2; // pad
283 
284   pr_sigpend = data.GetAddress(&offset);
285   pr_sighold = data.GetAddress(&offset);
286 
287   pr_pid = data.GetU32(&offset);
288   pr_ppid = data.GetU32(&offset);
289   pr_pgrp = data.GetU32(&offset);
290   pr_sid = data.GetU32(&offset);
291 
292   pr_utime.tv_sec = data.GetAddress(&offset);
293   pr_utime.tv_usec = data.GetAddress(&offset);
294 
295   pr_stime.tv_sec = data.GetAddress(&offset);
296   pr_stime.tv_usec = data.GetAddress(&offset);
297 
298   pr_cutime.tv_sec = data.GetAddress(&offset);
299   pr_cutime.tv_usec = data.GetAddress(&offset);
300 
301   pr_cstime.tv_sec = data.GetAddress(&offset);
302   pr_cstime.tv_usec = data.GetAddress(&offset);
303 
304   return error;
305 }
306 
307 // Parse PRPSINFO from NOTE entry
308 ELFLinuxPrPsInfo::ELFLinuxPrPsInfo() {
309   memset(this, 0, sizeof(ELFLinuxPrPsInfo));
310 }
311 
312 size_t ELFLinuxPrPsInfo::GetSize(const lldb_private::ArchSpec &arch) {
313   constexpr size_t mips_linux_pr_psinfo_size_o32_n32 = 128;
314   if (arch.IsMIPS()) {
315     uint8_t address_byte_size = arch.GetAddressByteSize();
316     if (address_byte_size == 8)
317       return sizeof(ELFLinuxPrPsInfo);
318     return mips_linux_pr_psinfo_size_o32_n32;
319   }
320 
321   switch (arch.GetCore()) {
322   case lldb_private::ArchSpec::eCore_s390x_generic:
323   case lldb_private::ArchSpec::eCore_x86_64_x86_64:
324     return sizeof(ELFLinuxPrPsInfo);
325   case lldb_private::ArchSpec::eCore_x86_32_i386:
326   case lldb_private::ArchSpec::eCore_x86_32_i486:
327     return 124;
328   default:
329     return 0;
330   }
331 }
332 
333 Status ELFLinuxPrPsInfo::Parse(const DataExtractor &data,
334                                const ArchSpec &arch) {
335   Status error;
336   ByteOrder byteorder = data.GetByteOrder();
337   if (GetSize(arch) > data.GetByteSize()) {
338     error.SetErrorStringWithFormat(
339         "NT_PRPSINFO size should be %zu, but the remaining bytes are: %" PRIu64,
340         GetSize(arch), data.GetByteSize());
341     return error;
342   }
343   size_t size = 0;
344   offset_t offset = 0;
345 
346   pr_state = data.GetU8(&offset);
347   pr_sname = data.GetU8(&offset);
348   pr_zomb = data.GetU8(&offset);
349   pr_nice = data.GetU8(&offset);
350   if (data.GetAddressByteSize() == 8) {
351     // Word align the next field on 64 bit.
352     offset += 4;
353   }
354 
355   pr_flag = data.GetAddress(&offset);
356 
357   if (arch.IsMIPS()) {
358     // The pr_uid and pr_gid is always 32 bit irrespective of platforms
359     pr_uid = data.GetU32(&offset);
360     pr_gid = data.GetU32(&offset);
361   } else {
362     // 16 bit on 32 bit platforms, 32 bit on 64 bit platforms
363     pr_uid = data.GetMaxU64(&offset, data.GetAddressByteSize() >> 1);
364     pr_gid = data.GetMaxU64(&offset, data.GetAddressByteSize() >> 1);
365   }
366 
367   pr_pid = data.GetU32(&offset);
368   pr_ppid = data.GetU32(&offset);
369   pr_pgrp = data.GetU32(&offset);
370   pr_sid = data.GetU32(&offset);
371 
372   size = 16;
373   data.ExtractBytes(offset, size, byteorder, pr_fname);
374   offset += size;
375 
376   size = 80;
377   data.ExtractBytes(offset, size, byteorder, pr_psargs);
378   offset += size;
379 
380   return error;
381 }
382 
383 // Parse SIGINFO from NOTE entry
384 ELFLinuxSigInfo::ELFLinuxSigInfo() { memset(this, 0, sizeof(ELFLinuxSigInfo)); }
385 
386 size_t ELFLinuxSigInfo::GetSize(const lldb_private::ArchSpec &arch) {
387   if (arch.IsMIPS())
388     return sizeof(ELFLinuxSigInfo);
389   switch (arch.GetCore()) {
390   case lldb_private::ArchSpec::eCore_x86_64_x86_64:
391     return sizeof(ELFLinuxSigInfo);
392   case lldb_private::ArchSpec::eCore_s390x_generic:
393   case lldb_private::ArchSpec::eCore_x86_32_i386:
394   case lldb_private::ArchSpec::eCore_x86_32_i486:
395     return 12;
396   default:
397     return 0;
398   }
399 }
400 
401 Status ELFLinuxSigInfo::Parse(const DataExtractor &data, const ArchSpec &arch) {
402   Status error;
403   if (GetSize(arch) > data.GetByteSize()) {
404     error.SetErrorStringWithFormat(
405         "NT_SIGINFO size should be %zu, but the remaining bytes are: %" PRIu64,
406         GetSize(arch), data.GetByteSize());
407     return error;
408   }
409 
410   // Parsing from a 32 bit ELF core file, and populating/reusing the structure
411   // properly, because the struct is for the 64 bit version
412   offset_t offset = 0;
413   si_signo = data.GetU32(&offset);
414   si_errno = data.GetU32(&offset);
415   si_code = data.GetU32(&offset);
416 
417   return error;
418 }
419