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98a03287 | 1 | /* Internal interfaces for the Windows code |
3c76026d | 2 | Copyright (C) 1995-2020 Free Software Foundation, Inc. |
98a03287 TT |
3 | |
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include "gdbsupport/common-defs.h" | |
20 | #include "nat/windows-nat.h" | |
8d30e395 TT |
21 | #include "gdbsupport/common-debug.h" |
22 | ||
4834dad0 TT |
23 | namespace windows_nat |
24 | { | |
25 | ||
3c76026d TT |
26 | HANDLE current_process_handle; |
27 | DWORD current_process_id; | |
28 | DWORD main_thread_id; | |
29 | enum gdb_signal last_sig = GDB_SIGNAL_0; | |
30 | DEBUG_EVENT current_event; | |
71fbdbaf TT |
31 | |
32 | /* The most recent event from WaitForDebugEvent. Unlike | |
33 | current_event, this is guaranteed never to come from a pending | |
34 | stop. This is important because only data from the most recent | |
35 | event from WaitForDebugEvent can be used when calling | |
36 | ContinueDebugEvent. */ | |
37 | static DEBUG_EVENT last_wait_event; | |
38 | ||
3c76026d TT |
39 | windows_thread_info *current_windows_thread; |
40 | DWORD desired_stop_thread_id = -1; | |
41 | std::vector<pending_stop> pending_stops; | |
42 | EXCEPTION_RECORD siginfo_er; | |
43 | ||
13302e95 HD |
44 | #ifdef __x86_64__ |
45 | bool ignore_first_breakpoint = false; | |
46 | #endif | |
47 | ||
e758e19c TT |
48 | /* Note that 'debug_events' must be locally defined in the relevant |
49 | functions. */ | |
50 | #define DEBUG_EVENTS(x) if (debug_events) debug_printf x | |
51 | ||
65bafd5b TT |
52 | windows_thread_info::~windows_thread_info () |
53 | { | |
65bafd5b TT |
54 | } |
55 | ||
98a03287 TT |
56 | void |
57 | windows_thread_info::suspend () | |
58 | { | |
59 | if (suspended != 0) | |
60 | return; | |
61 | ||
62 | if (SuspendThread (h) == (DWORD) -1) | |
63 | { | |
64 | DWORD err = GetLastError (); | |
65 | ||
66 | /* We get Access Denied (5) when trying to suspend | |
67 | threads that Windows started on behalf of the | |
68 | debuggee, usually when those threads are just | |
69 | about to exit. | |
70 | We can get Invalid Handle (6) if the main thread | |
71 | has exited. */ | |
72 | if (err != ERROR_INVALID_HANDLE && err != ERROR_ACCESS_DENIED) | |
73 | warning (_("SuspendThread (tid=0x%x) failed. (winerr %u)"), | |
74 | (unsigned) tid, (unsigned) err); | |
75 | suspended = -1; | |
76 | } | |
77 | else | |
78 | suspended = 1; | |
79 | } | |
80 | ||
81 | void | |
82 | windows_thread_info::resume () | |
83 | { | |
84 | if (suspended > 0) | |
85 | { | |
0a4afda3 TT |
86 | stopped_at_software_breakpoint = false; |
87 | ||
98a03287 TT |
88 | if (ResumeThread (h) == (DWORD) -1) |
89 | { | |
90 | DWORD err = GetLastError (); | |
91 | warning (_("warning: ResumeThread (tid=0x%x) failed. (winerr %u)"), | |
92 | (unsigned) tid, (unsigned) err); | |
93 | } | |
94 | } | |
95 | suspended = 0; | |
96 | } | |
4834dad0 | 97 | |
9d8679cc TT |
98 | const char * |
99 | get_image_name (HANDLE h, void *address, int unicode) | |
100 | { | |
101 | #ifdef __CYGWIN__ | |
102 | static char buf[MAX_PATH]; | |
103 | #else | |
104 | static char buf[(2 * MAX_PATH) + 1]; | |
105 | #endif | |
106 | DWORD size = unicode ? sizeof (WCHAR) : sizeof (char); | |
107 | char *address_ptr; | |
108 | int len = 0; | |
109 | char b[2]; | |
110 | SIZE_T done; | |
111 | ||
112 | /* Attempt to read the name of the dll that was detected. | |
113 | This is documented to work only when actively debugging | |
114 | a program. It will not work for attached processes. */ | |
115 | if (address == NULL) | |
116 | return NULL; | |
117 | ||
118 | #ifdef _WIN32_WCE | |
119 | /* Windows CE reports the address of the image name, | |
120 | instead of an address of a pointer into the image name. */ | |
121 | address_ptr = address; | |
122 | #else | |
123 | /* See if we could read the address of a string, and that the | |
124 | address isn't null. */ | |
125 | if (!ReadProcessMemory (h, address, &address_ptr, | |
126 | sizeof (address_ptr), &done) | |
127 | || done != sizeof (address_ptr) | |
128 | || !address_ptr) | |
129 | return NULL; | |
130 | #endif | |
131 | ||
132 | /* Find the length of the string. */ | |
133 | while (ReadProcessMemory (h, address_ptr + len++ * size, &b, size, &done) | |
134 | && (b[0] != 0 || b[size - 1] != 0) && done == size) | |
135 | continue; | |
136 | ||
137 | if (!unicode) | |
138 | ReadProcessMemory (h, address_ptr, buf, len, &done); | |
139 | else | |
140 | { | |
141 | WCHAR *unicode_address = (WCHAR *) alloca (len * sizeof (WCHAR)); | |
142 | ReadProcessMemory (h, address_ptr, unicode_address, len * sizeof (WCHAR), | |
143 | &done); | |
144 | #ifdef __CYGWIN__ | |
145 | wcstombs (buf, unicode_address, MAX_PATH); | |
146 | #else | |
147 | WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, sizeof buf, | |
148 | 0, 0); | |
149 | #endif | |
150 | } | |
151 | ||
152 | return buf; | |
153 | } | |
154 | ||
8d30e395 TT |
155 | /* The exception thrown by a program to tell the debugger the name of |
156 | a thread. The exception record contains an ID of a thread and a | |
157 | name to give it. This exception has no documented name, but MSDN | |
158 | dubs it "MS_VC_EXCEPTION" in one code example. */ | |
159 | #define MS_VC_EXCEPTION 0x406d1388 | |
160 | ||
161 | handle_exception_result | |
162 | handle_exception (struct target_waitstatus *ourstatus, bool debug_exceptions) | |
163 | { | |
164 | #define DEBUG_EXCEPTION_SIMPLE(x) if (debug_exceptions) \ | |
165 | debug_printf ("gdb: Target exception %s at %s\n", x, \ | |
166 | host_address_to_string (\ | |
167 | current_event.u.Exception.ExceptionRecord.ExceptionAddress)) | |
168 | ||
169 | EXCEPTION_RECORD *rec = ¤t_event.u.Exception.ExceptionRecord; | |
170 | DWORD code = rec->ExceptionCode; | |
171 | handle_exception_result result = HANDLE_EXCEPTION_HANDLED; | |
172 | ||
173 | memcpy (&siginfo_er, rec, sizeof siginfo_er); | |
174 | ||
175 | ourstatus->kind = TARGET_WAITKIND_STOPPED; | |
176 | ||
177 | /* Record the context of the current thread. */ | |
178 | thread_rec (ptid_t (current_event.dwProcessId, current_event.dwThreadId, 0), | |
179 | DONT_SUSPEND); | |
180 | ||
181 | switch (code) | |
182 | { | |
183 | case EXCEPTION_ACCESS_VIOLATION: | |
184 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ACCESS_VIOLATION"); | |
185 | ourstatus->value.sig = GDB_SIGNAL_SEGV; | |
a010605f TT |
186 | if (handle_access_violation (rec)) |
187 | return HANDLE_EXCEPTION_UNHANDLED; | |
8d30e395 TT |
188 | break; |
189 | case STATUS_STACK_OVERFLOW: | |
190 | DEBUG_EXCEPTION_SIMPLE ("STATUS_STACK_OVERFLOW"); | |
191 | ourstatus->value.sig = GDB_SIGNAL_SEGV; | |
192 | break; | |
193 | case STATUS_FLOAT_DENORMAL_OPERAND: | |
194 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DENORMAL_OPERAND"); | |
195 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
196 | break; | |
197 | case EXCEPTION_ARRAY_BOUNDS_EXCEEDED: | |
198 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ARRAY_BOUNDS_EXCEEDED"); | |
199 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
200 | break; | |
201 | case STATUS_FLOAT_INEXACT_RESULT: | |
202 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INEXACT_RESULT"); | |
203 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
204 | break; | |
205 | case STATUS_FLOAT_INVALID_OPERATION: | |
206 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_INVALID_OPERATION"); | |
207 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
208 | break; | |
209 | case STATUS_FLOAT_OVERFLOW: | |
210 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_OVERFLOW"); | |
211 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
212 | break; | |
213 | case STATUS_FLOAT_STACK_CHECK: | |
214 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_STACK_CHECK"); | |
215 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
216 | break; | |
217 | case STATUS_FLOAT_UNDERFLOW: | |
218 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_UNDERFLOW"); | |
219 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
220 | break; | |
221 | case STATUS_FLOAT_DIVIDE_BY_ZERO: | |
222 | DEBUG_EXCEPTION_SIMPLE ("STATUS_FLOAT_DIVIDE_BY_ZERO"); | |
223 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
224 | break; | |
225 | case STATUS_INTEGER_DIVIDE_BY_ZERO: | |
226 | DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_DIVIDE_BY_ZERO"); | |
227 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
228 | break; | |
229 | case STATUS_INTEGER_OVERFLOW: | |
230 | DEBUG_EXCEPTION_SIMPLE ("STATUS_INTEGER_OVERFLOW"); | |
231 | ourstatus->value.sig = GDB_SIGNAL_FPE; | |
232 | break; | |
233 | case EXCEPTION_BREAKPOINT: | |
234 | #ifdef __x86_64__ | |
235 | if (ignore_first_breakpoint) | |
236 | { | |
237 | /* For WOW64 processes, there are always 2 breakpoint exceptions | |
238 | on startup, first a BREAKPOINT for the 64bit ntdll.dll, | |
239 | then a WX86_BREAKPOINT for the 32bit ntdll.dll. | |
240 | Here we only care about the WX86_BREAKPOINT's. */ | |
241 | ourstatus->kind = TARGET_WAITKIND_SPURIOUS; | |
242 | ignore_first_breakpoint = false; | |
243 | } | |
244 | #endif | |
245 | /* FALLTHROUGH */ | |
246 | case STATUS_WX86_BREAKPOINT: | |
247 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_BREAKPOINT"); | |
248 | ourstatus->value.sig = GDB_SIGNAL_TRAP; | |
249 | #ifdef _WIN32_WCE | |
250 | /* Remove the initial breakpoint. */ | |
251 | check_breakpoints ((CORE_ADDR) (long) current_event | |
252 | .u.Exception.ExceptionRecord.ExceptionAddress); | |
253 | #endif | |
254 | break; | |
255 | case DBG_CONTROL_C: | |
256 | DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_C"); | |
257 | ourstatus->value.sig = GDB_SIGNAL_INT; | |
258 | break; | |
259 | case DBG_CONTROL_BREAK: | |
260 | DEBUG_EXCEPTION_SIMPLE ("DBG_CONTROL_BREAK"); | |
261 | ourstatus->value.sig = GDB_SIGNAL_INT; | |
262 | break; | |
263 | case EXCEPTION_SINGLE_STEP: | |
264 | case STATUS_WX86_SINGLE_STEP: | |
265 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_SINGLE_STEP"); | |
266 | ourstatus->value.sig = GDB_SIGNAL_TRAP; | |
267 | break; | |
268 | case EXCEPTION_ILLEGAL_INSTRUCTION: | |
269 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_ILLEGAL_INSTRUCTION"); | |
270 | ourstatus->value.sig = GDB_SIGNAL_ILL; | |
271 | break; | |
272 | case EXCEPTION_PRIV_INSTRUCTION: | |
273 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_PRIV_INSTRUCTION"); | |
274 | ourstatus->value.sig = GDB_SIGNAL_ILL; | |
275 | break; | |
276 | case EXCEPTION_NONCONTINUABLE_EXCEPTION: | |
277 | DEBUG_EXCEPTION_SIMPLE ("EXCEPTION_NONCONTINUABLE_EXCEPTION"); | |
278 | ourstatus->value.sig = GDB_SIGNAL_ILL; | |
279 | break; | |
280 | case MS_VC_EXCEPTION: | |
281 | DEBUG_EXCEPTION_SIMPLE ("MS_VC_EXCEPTION"); | |
282 | if (handle_ms_vc_exception (rec)) | |
283 | { | |
284 | ourstatus->value.sig = GDB_SIGNAL_TRAP; | |
285 | result = HANDLE_EXCEPTION_IGNORED; | |
286 | break; | |
287 | } | |
288 | /* treat improperly formed exception as unknown */ | |
289 | /* FALLTHROUGH */ | |
290 | default: | |
291 | /* Treat unhandled first chance exceptions specially. */ | |
292 | if (current_event.u.Exception.dwFirstChance) | |
293 | return HANDLE_EXCEPTION_UNHANDLED; | |
294 | debug_printf ("gdb: unknown target exception 0x%08x at %s\n", | |
295 | (unsigned) current_event.u.Exception.ExceptionRecord.ExceptionCode, | |
296 | host_address_to_string ( | |
297 | current_event.u.Exception.ExceptionRecord.ExceptionAddress)); | |
298 | ourstatus->value.sig = GDB_SIGNAL_UNKNOWN; | |
299 | break; | |
300 | } | |
301 | ||
302 | last_sig = ourstatus->value.sig; | |
303 | return result; | |
304 | ||
305 | #undef DEBUG_EXCEPTION_SIMPLE | |
306 | } | |
307 | ||
e758e19c TT |
308 | /* See nat/windows-nat.h. */ |
309 | ||
310 | bool | |
311 | matching_pending_stop (bool debug_events) | |
312 | { | |
313 | /* If there are pending stops, and we might plausibly hit one of | |
314 | them, we don't want to actually continue the inferior -- we just | |
315 | want to report the stop. In this case, we just pretend to | |
316 | continue. See the comment by the definition of "pending_stops" | |
317 | for details on why this is needed. */ | |
318 | for (const auto &item : pending_stops) | |
319 | { | |
320 | if (desired_stop_thread_id == -1 | |
321 | || desired_stop_thread_id == item.thread_id) | |
322 | { | |
323 | DEBUG_EVENTS (("windows_continue - pending stop anticipated, " | |
324 | "desired=0x%x, item=0x%x\n", | |
325 | desired_stop_thread_id, item.thread_id)); | |
326 | return true; | |
327 | } | |
328 | } | |
329 | ||
330 | return false; | |
331 | } | |
332 | ||
333 | /* See nat/windows-nat.h. */ | |
334 | ||
d2977bc4 TT |
335 | gdb::optional<pending_stop> |
336 | fetch_pending_stop (bool debug_events) | |
337 | { | |
338 | gdb::optional<pending_stop> result; | |
339 | for (auto iter = pending_stops.begin (); | |
340 | iter != pending_stops.end (); | |
341 | ++iter) | |
342 | { | |
343 | if (desired_stop_thread_id == -1 | |
344 | || desired_stop_thread_id == iter->thread_id) | |
345 | { | |
346 | result = *iter; | |
347 | current_event = iter->event; | |
348 | ||
349 | DEBUG_EVENTS (("get_windows_debug_event - " | |
350 | "pending stop found in 0x%x (desired=0x%x)\n", | |
351 | iter->thread_id, desired_stop_thread_id)); | |
352 | ||
353 | pending_stops.erase (iter); | |
354 | break; | |
355 | } | |
356 | } | |
357 | ||
358 | return result; | |
359 | } | |
360 | ||
361 | /* See nat/windows-nat.h. */ | |
362 | ||
e758e19c TT |
363 | BOOL |
364 | continue_last_debug_event (DWORD continue_status, bool debug_events) | |
365 | { | |
366 | DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=0x%x, %s);\n", | |
367 | (unsigned) last_wait_event.dwProcessId, | |
368 | (unsigned) last_wait_event.dwThreadId, | |
369 | continue_status == DBG_CONTINUE ? | |
370 | "DBG_CONTINUE" : "DBG_EXCEPTION_NOT_HANDLED")); | |
371 | ||
372 | return ContinueDebugEvent (last_wait_event.dwProcessId, | |
373 | last_wait_event.dwThreadId, | |
374 | continue_status); | |
375 | } | |
376 | ||
2c1d95e8 TT |
377 | /* See nat/windows-nat.h. */ |
378 | ||
379 | BOOL | |
380 | wait_for_debug_event (DEBUG_EVENT *event, DWORD timeout) | |
381 | { | |
382 | BOOL result = WaitForDebugEvent (event, timeout); | |
383 | if (result) | |
384 | last_wait_event = *event; | |
385 | return result; | |
386 | } | |
e758e19c | 387 | |
4834dad0 | 388 | } |