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c906108c | 1 | /* Low level Unix child interface to ttrace, for GDB when running under HP-UX. |
b6ba6518 KB |
2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, |
3 | 1999, 2000, 2001 | |
c906108c SS |
4 | Free Software Foundation, Inc. |
5 | ||
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
26 | #include "target.h" | |
27 | #include "gdb_string.h" | |
03f2053f | 28 | #include "gdb_wait.h" |
c906108c SS |
29 | #include "command.h" |
30 | ||
31 | /* Some hackery to work around a use of the #define name NO_FLAGS | |
32 | * in both gdb and HPUX (bfd.h and /usr/include/machine/vmparam.h). | |
33 | */ | |
34 | #ifdef NO_FLAGS | |
35 | #define INFTTRACE_TEMP_HACK NO_FLAGS | |
36 | #undef NO_FLAGS | |
37 | #endif | |
38 | ||
39 | #ifdef USG | |
40 | #include <sys/types.h> | |
41 | #endif | |
42 | ||
43 | #include <sys/param.h> | |
44 | #include <sys/dir.h> | |
45 | #include <signal.h> | |
46 | #include <sys/ioctl.h> | |
47 | ||
48 | #include <sys/ttrace.h> | |
c906108c SS |
49 | #include <sys/mman.h> |
50 | ||
51 | #ifndef NO_PTRACE_H | |
52 | #ifdef PTRACE_IN_WRONG_PLACE | |
53 | #include <ptrace.h> | |
54 | #else | |
55 | #include <sys/ptrace.h> | |
56 | #endif | |
57 | #endif /* NO_PTRACE_H */ | |
58 | ||
59 | /* Second half of the hackery above. Non-ANSI C, so | |
60 | * we can't use "#error", alas. | |
61 | */ | |
62 | #ifdef NO_FLAGS | |
63 | #if (NO_FLAGS != INFTTRACE_TEMP_HACK ) | |
64 | /* #error "Hackery to remove warning didn't work right" */ | |
65 | #else | |
66 | /* Ok, new def'n of NO_FLAGS is same as old one; no action needed. */ | |
67 | #endif | |
68 | #else | |
69 | /* #error "Didn't get expected re-definition of NO_FLAGS" */ | |
70 | #define NO_FLAGS INFTTRACE_TEMP_HACK | |
71 | #endif | |
72 | ||
73 | #if !defined (PT_SETTRC) | |
74 | #define PT_SETTRC 0 /* Make process traceable by parent */ | |
75 | #endif | |
76 | #if !defined (PT_READ_I) | |
77 | #define PT_READ_I 1 /* Read word from text space */ | |
78 | #endif | |
79 | #if !defined (PT_READ_D) | |
80 | #define PT_READ_D 2 /* Read word from data space */ | |
81 | #endif | |
82 | #if !defined (PT_READ_U) | |
83 | #define PT_READ_U 3 /* Read word from kernel user struct */ | |
84 | #endif | |
85 | #if !defined (PT_WRITE_I) | |
86 | #define PT_WRITE_I 4 /* Write word to text space */ | |
87 | #endif | |
88 | #if !defined (PT_WRITE_D) | |
89 | #define PT_WRITE_D 5 /* Write word to data space */ | |
90 | #endif | |
91 | #if !defined (PT_WRITE_U) | |
92 | #define PT_WRITE_U 6 /* Write word to kernel user struct */ | |
93 | #endif | |
94 | #if !defined (PT_CONTINUE) | |
95 | #define PT_CONTINUE 7 /* Continue after signal */ | |
96 | #endif | |
97 | #if !defined (PT_STEP) | |
98 | #define PT_STEP 9 /* Set flag for single stepping */ | |
99 | #endif | |
100 | #if !defined (PT_KILL) | |
101 | #define PT_KILL 8 /* Send child a SIGKILL signal */ | |
102 | #endif | |
103 | ||
104 | #ifndef PT_ATTACH | |
105 | #define PT_ATTACH PTRACE_ATTACH | |
106 | #endif | |
107 | #ifndef PT_DETACH | |
108 | #define PT_DETACH PTRACE_DETACH | |
109 | #endif | |
110 | ||
111 | #include "gdbcore.h" | |
112 | #ifndef NO_SYS_FILE | |
113 | #include <sys/file.h> | |
114 | #endif | |
115 | ||
116 | /* This semaphore is used to coordinate the child and parent processes | |
117 | after a fork(), and before an exec() by the child. See parent_attach_all | |
118 | for details. | |
c5aa993b JM |
119 | */ |
120 | typedef struct | |
121 | { | |
122 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
123 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
124 | } | |
125 | startup_semaphore_t; | |
c906108c SS |
126 | |
127 | #define SEM_TALK (1) | |
128 | #define SEM_LISTEN (0) | |
129 | ||
c5aa993b | 130 | static startup_semaphore_t startup_semaphore; |
c906108c SS |
131 | |
132 | /* See can_touch_threads_of_process for details. */ | |
c5aa993b JM |
133 | static int vforking_child_pid = 0; |
134 | static int vfork_in_flight = 0; | |
c906108c SS |
135 | |
136 | /* To support PREPARE_TO_PROCEED (hppa_prepare_to_proceed). | |
137 | */ | |
c5aa993b | 138 | static pid_t old_gdb_pid = 0; |
c906108c SS |
139 | static pid_t reported_pid = 0; |
140 | static int reported_bpt = 0; | |
141 | ||
142 | /* 1 if ok as results of a ttrace or ttrace_wait call, 0 otherwise. | |
143 | */ | |
144 | #define TT_OK( _status, _errno ) \ | |
145 | (((_status) == 1) && ((_errno) == 0)) | |
146 | ||
147 | #define TTRACE_ARG_TYPE uint64_t | |
148 | ||
149 | /* When supplied as the "addr" operand, ttrace interprets this | |
150 | to mean, "from the current address". | |
c5aa993b | 151 | */ |
c906108c SS |
152 | #define TT_USE_CURRENT_PC ((TTRACE_ARG_TYPE) TT_NOPC) |
153 | ||
154 | /* When supplied as the "addr", "data" or "addr2" operand for most | |
155 | requests, ttrace interprets this to mean, "pay no heed to this | |
156 | argument". | |
c5aa993b | 157 | */ |
c906108c SS |
158 | #define TT_NIL ((TTRACE_ARG_TYPE) TT_NULLARG) |
159 | ||
160 | /* This is capable of holding the value of a 32-bit register. The | |
161 | value is always left-aligned in the buffer; i.e., [0] contains | |
162 | the most-significant byte of the register's value, and [sizeof(reg)] | |
163 | contains the least-significant value. | |
164 | ||
165 | ??rehrauer: Yes, this assumes that an int is 32-bits on HP-UX, and | |
166 | that registers are 32-bits on HP-UX. The latter assumption changes | |
167 | with PA2.0. | |
c5aa993b JM |
168 | */ |
169 | typedef int register_value_t; | |
c906108c SS |
170 | |
171 | /******************************************************************** | |
172 | ||
173 | How this works: | |
174 | ||
175 | 1. Thread numbers | |
176 | ||
177 | The rest of GDB sees threads as being things with different | |
178 | "pid" (process id) values. See "thread.c" for details. The | |
179 | separate threads will be seen and reacted to if infttrace passes | |
180 | back different pid values (for _events_). See wait_for_inferior | |
181 | in inftarg.c. | |
182 | ||
183 | So infttrace is going to use thread ids externally, pretending | |
184 | they are process ids, and keep track internally so that it can | |
185 | use the real process id (and thread id) when calling ttrace. | |
186 | ||
187 | The data structure that supports this is a linked list of the | |
188 | current threads. Since at some date infttrace will have to | |
189 | deal with multiple processes, each list element records its | |
190 | corresponding pid, rather than having a single global. | |
191 | ||
192 | Note that the list is only approximately current; that's ok, as | |
193 | it's up to date when we need it (we hope!). Also, it can contain | |
194 | dead threads, as there's no harm if it does. | |
195 | ||
196 | The approach taken here is to bury the translation from external | |
197 | to internal inside "call_ttrace" and a few other places. | |
198 | ||
199 | There are some wrinkles: | |
200 | ||
201 | o When GDB forks itself to create the debug target process, | |
202 | there's only a pid of 0 around in the child, so the | |
203 | TT_PROC_SETTRC operation uses a more direct call to ttrace; | |
204 | Similiarly, the initial setting of the event mask happens | |
205 | early as well, and so is also special-cased, and an attach | |
206 | uses a real pid; | |
207 | ||
208 | o We define an unthreaded application as having a "pseudo" | |
209 | thread; | |
210 | ||
211 | o To keep from confusing the rest of GDB, we don't switch | |
212 | the PID for the pseudo thread to a TID. A table will help: | |
213 | ||
214 | Rest of GDB sees these PIDs: pid tid1 tid2 tid3 ... | |
215 | ||
216 | Our thread list stores: pid pid pid pid ... | |
217 | tid0 tid1 tid2 tid3 | |
218 | ||
219 | Ttrace sees these TIDS: tid0 tid1 tid2 tid3 ... | |
220 | ||
221 | Both pid and tid0 will map to tid0, as there are infttrace.c-internal | |
222 | calls to ttrace using tid0. | |
223 | ||
224 | 2. Step and Continue | |
225 | ||
226 | Since we're implementing the "stop the world" model, sub-model | |
227 | "other threads run during step", we have some stuff to do: | |
228 | ||
229 | o User steps require continuing all threads other than the | |
230 | one the user is stepping; | |
231 | ||
232 | o Internal debugger steps (such as over a breakpoint or watchpoint, | |
233 | but not out of a library load thunk) require stepping only | |
234 | the selected thread; this means that we have to report the | |
235 | step finish on that thread, which can lead to complications; | |
236 | ||
237 | o When a thread is created, it is created running, rather | |
238 | than stopped--so we have to stop it. | |
239 | ||
240 | The OS doesn't guarantee the stopped thread list will be stable, | |
241 | no does it guarantee where on the stopped thread list a thread | |
242 | that is single-stepped will wind up: it's possible that it will | |
243 | be off the list for a while, it's possible the step will complete | |
244 | and it will be re-posted to the end... | |
245 | ||
246 | This means we have to scan the stopped thread list, build up | |
247 | a work-list, and then run down the work list; we can't do the | |
248 | step/continue during the scan. | |
249 | ||
250 | 3. Buffering events | |
251 | ||
252 | Then there's the issue of waiting for an event. We do this by | |
253 | noticing how many events are reported at the end of each wait. | |
254 | From then on, we "fake" all resumes and steps, returning instantly, | |
255 | and don't do another wait. Once all pending events are reported, | |
256 | we can really resume again. | |
257 | ||
258 | To keep this hidden, all the routines which know about tids and | |
259 | pids or real events and simulated ones are static (file-local). | |
260 | ||
261 | This code can make lots of calls to ttrace, in particular it | |
262 | can spin down the list of thread states more than once. If this | |
263 | becomes a performance hit, the spin could be done once and the | |
264 | various "tsp" blocks saved, keeping all later spins in this | |
265 | process. | |
266 | ||
267 | The O/S doesn't promise to keep the list straight, and so we must | |
268 | re-scan a lot. By observation, it looks like a single-step/wait | |
269 | puts the stepped thread at the end of the list but doesn't change | |
270 | it otherwise. | |
271 | ||
272 | **************************************************************** | |
273 | */ | |
274 | ||
275 | /* Uncomment these to turn on various debugging output */ | |
276 | /* #define THREAD_DEBUG */ | |
277 | /* #define WAIT_BUFFER_DEBUG */ | |
278 | /* #define PARANOIA */ | |
279 | ||
280 | ||
281 | #define INFTTRACE_ALL_THREADS (-1) | |
282 | #define INFTTRACE_STEP (1) | |
283 | #define INFTTRACE_CONTINUE (0) | |
284 | ||
285 | /* FIX: this is used in inftarg.c/child_wait, in a hack. | |
286 | */ | |
287 | extern int not_same_real_pid; | |
288 | ||
289 | /* This is used to count buffered events. | |
290 | */ | |
291 | static unsigned int more_events_left = 0; | |
292 | ||
293 | /* Process state. | |
294 | */ | |
c5aa993b JM |
295 | typedef enum process_state_enum |
296 | { | |
c906108c SS |
297 | STOPPED, |
298 | FAKE_STEPPING, | |
c5aa993b | 299 | FAKE_CONTINUE, /* For later use */ |
c906108c SS |
300 | RUNNING, |
301 | FORKING, | |
302 | VFORKING | |
c5aa993b JM |
303 | } |
304 | process_state_t; | |
c906108c SS |
305 | |
306 | static process_state_t process_state = STOPPED; | |
307 | ||
308 | /* User-specified stepping modality. | |
309 | */ | |
c5aa993b JM |
310 | typedef enum stepping_mode_enum |
311 | { | |
312 | DO_DEFAULT, /* ...which is a continue! */ | |
c906108c SS |
313 | DO_STEP, |
314 | DO_CONTINUE | |
c5aa993b JM |
315 | } |
316 | stepping_mode_t; | |
317 | ||
c906108c SS |
318 | /* Action to take on an attach, depends on |
319 | * what kind (user command, fork, vfork). | |
320 | * | |
321 | * At the moment, this is either: | |
322 | * | |
323 | * o continue with a SIGTRAP signal, or | |
324 | * | |
325 | * o leave stopped. | |
326 | */ | |
c5aa993b JM |
327 | typedef enum attach_continue_enum |
328 | { | |
329 | DO_ATTACH_CONTINUE, | |
330 | DONT_ATTACH_CONTINUE | |
331 | } | |
332 | attach_continue_t; | |
c906108c SS |
333 | |
334 | /* This flag is true if we are doing a step-over-bpt | |
335 | * with buffered events. We will have to be sure to | |
336 | * report the right thread, as otherwise the spaghetti | |
337 | * code in "infrun.c/wait_for_inferior" will get | |
338 | * confused. | |
339 | */ | |
c5aa993b JM |
340 | static int doing_fake_step = 0; |
341 | static lwpid_t fake_step_tid = 0; | |
c906108c | 342 | \f |
c5aa993b | 343 | |
c906108c SS |
344 | /**************************************************** |
345 | * Thread information structure routines and types. * | |
346 | **************************************************** | |
347 | */ | |
c5aa993b | 348 | typedef |
c906108c | 349 | struct thread_info_struct |
c5aa993b JM |
350 | { |
351 | int am_pseudo; /* This is a pseudo-thread for the process. */ | |
352 | int pid; /* Process ID */ | |
353 | lwpid_t tid; /* Thread ID */ | |
354 | int handled; /* 1 if a buffered event was handled. */ | |
355 | int seen; /* 1 if this thread was seen on a traverse. */ | |
356 | int terminated; /* 1 if thread has terminated. */ | |
357 | int have_signal; /* 1 if signal to be sent */ | |
358 | enum target_signal signal_value; /* Signal to send */ | |
359 | int have_start; /* 1 if alternate starting address */ | |
360 | stepping_mode_t stepping_mode; /* Whether to step or continue */ | |
361 | CORE_ADDR start; /* Where to start */ | |
362 | int have_state; /* 1 if the event state has been set */ | |
363 | ttstate_t last_stop_state; /* The most recently-waited event for this thread. */ | |
c906108c | 364 | struct thread_info_struct |
c5aa993b | 365 | *next; /* All threads are linked via this field. */ |
c906108c | 366 | struct thread_info_struct |
c5aa993b JM |
367 | *next_pseudo; /* All pseudo-threads are linked via this field. */ |
368 | } | |
369 | thread_info; | |
c906108c SS |
370 | |
371 | typedef | |
372 | struct thread_info_header_struct | |
c5aa993b JM |
373 | { |
374 | int count; | |
c906108c SS |
375 | thread_info *head; |
376 | thread_info *head_pseudo; | |
c906108c | 377 | |
c5aa993b JM |
378 | } |
379 | thread_info_header; | |
c906108c | 380 | |
c5aa993b JM |
381 | static thread_info_header thread_head = |
382 | {0, NULL, NULL}; | |
383 | static thread_info_header deleted_threads = | |
384 | {0, NULL, NULL}; | |
c906108c | 385 | |
c5aa993b | 386 | static saved_real_pid = 0; |
c906108c | 387 | \f |
c5aa993b | 388 | |
c906108c SS |
389 | /************************************************* |
390 | * Debugging support functions * | |
391 | ************************************************* | |
392 | */ | |
393 | CORE_ADDR | |
fba45db2 | 394 | get_raw_pc (lwpid_t ttid) |
c906108c | 395 | { |
c5aa993b JM |
396 | unsigned long pc_val; |
397 | int offset; | |
398 | int res; | |
399 | ||
400 | offset = register_addr (PC_REGNUM, U_REGS_OFFSET); | |
401 | res = read_from_register_save_state ( | |
402 | ttid, | |
403 | (TTRACE_ARG_TYPE) offset, | |
404 | (char *) &pc_val, | |
405 | sizeof (pc_val)); | |
406 | if (res <= 0) | |
407 | { | |
408 | return (CORE_ADDR) pc_val; | |
409 | } | |
410 | else | |
411 | { | |
412 | return (CORE_ADDR) 0; | |
413 | } | |
414 | } | |
c906108c SS |
415 | |
416 | static char * | |
fba45db2 | 417 | get_printable_name_of_stepping_mode (stepping_mode_t mode) |
c906108c | 418 | { |
c5aa993b JM |
419 | switch (mode) |
420 | { | |
421 | case DO_DEFAULT: | |
422 | return "DO_DEFAULT"; | |
423 | case DO_STEP: | |
424 | return "DO_STEP"; | |
425 | case DO_CONTINUE: | |
426 | return "DO_CONTINUE"; | |
427 | default: | |
428 | return "?unknown mode?"; | |
429 | } | |
c906108c SS |
430 | } |
431 | ||
432 | /* This function returns a pointer to a string describing the | |
433 | * ttrace event being reported. | |
434 | */ | |
435 | char * | |
fba45db2 | 436 | get_printable_name_of_ttrace_event (ttevents_t event) |
c906108c SS |
437 | { |
438 | /* This enumeration is "gappy", so don't use a table. */ | |
c5aa993b JM |
439 | switch (event) |
440 | { | |
c906108c SS |
441 | |
442 | case TTEVT_NONE: | |
c5aa993b | 443 | return "TTEVT_NONE"; |
c906108c | 444 | case TTEVT_SIGNAL: |
c5aa993b | 445 | return "TTEVT_SIGNAL"; |
c906108c | 446 | case TTEVT_FORK: |
c5aa993b | 447 | return "TTEVT_FORK"; |
c906108c | 448 | case TTEVT_EXEC: |
c5aa993b | 449 | return "TTEVT_EXEC"; |
c906108c | 450 | case TTEVT_EXIT: |
c5aa993b | 451 | return "TTEVT_EXIT"; |
c906108c | 452 | case TTEVT_VFORK: |
c5aa993b | 453 | return "TTEVT_VFORK"; |
c906108c | 454 | case TTEVT_SYSCALL_RETURN: |
c5aa993b | 455 | return "TTEVT_SYSCALL_RETURN"; |
c906108c | 456 | case TTEVT_LWP_CREATE: |
c5aa993b | 457 | return "TTEVT_LWP_CREATE"; |
c906108c | 458 | case TTEVT_LWP_TERMINATE: |
c5aa993b | 459 | return "TTEVT_LWP_TERMINATE"; |
c906108c | 460 | case TTEVT_LWP_EXIT: |
c5aa993b | 461 | return "TTEVT_LWP_EXIT"; |
c906108c | 462 | case TTEVT_LWP_ABORT_SYSCALL: |
c5aa993b | 463 | return "TTEVT_LWP_ABORT_SYSCALL"; |
c906108c | 464 | case TTEVT_SYSCALL_ENTRY: |
c5aa993b JM |
465 | return "TTEVT_SYSCALL_ENTRY"; |
466 | case TTEVT_SYSCALL_RESTART: | |
467 | return "TTEVT_SYSCALL_RESTART"; | |
468 | default: | |
c906108c | 469 | return "?new event?"; |
c5aa993b | 470 | } |
c906108c | 471 | } |
c906108c | 472 | \f |
c5aa993b | 473 | |
c906108c SS |
474 | /* This function translates the ttrace request enumeration into |
475 | * a character string that is its printable (aka "human readable") | |
476 | * name. | |
477 | */ | |
478 | char * | |
fba45db2 | 479 | get_printable_name_of_ttrace_request (ttreq_t request) |
c906108c SS |
480 | { |
481 | if (!IS_TTRACE_REQ (request)) | |
482 | return "?bad req?"; | |
483 | ||
484 | /* This enumeration is "gappy", so don't use a table. */ | |
c5aa993b JM |
485 | switch (request) |
486 | { | |
487 | case TT_PROC_SETTRC: | |
c906108c | 488 | return "TT_PROC_SETTRC"; |
c5aa993b | 489 | case TT_PROC_ATTACH: |
c906108c | 490 | return "TT_PROC_ATTACH"; |
c5aa993b | 491 | case TT_PROC_DETACH: |
c906108c | 492 | return "TT_PROC_DETACH"; |
c5aa993b | 493 | case TT_PROC_RDTEXT: |
c906108c | 494 | return "TT_PROC_RDTEXT"; |
c5aa993b | 495 | case TT_PROC_WRTEXT: |
c906108c | 496 | return "TT_PROC_WRTEXT"; |
c5aa993b | 497 | case TT_PROC_RDDATA: |
c906108c | 498 | return "TT_PROC_RDDATA"; |
c5aa993b | 499 | case TT_PROC_WRDATA: |
c906108c | 500 | return "TT_PROC_WRDATA"; |
c5aa993b | 501 | case TT_PROC_STOP: |
c906108c | 502 | return "TT_PROC_STOP"; |
c5aa993b | 503 | case TT_PROC_CONTINUE: |
c906108c | 504 | return "TT_PROC_CONTINUE"; |
c5aa993b | 505 | case TT_PROC_GET_PATHNAME: |
c906108c | 506 | return "TT_PROC_GET_PATHNAME"; |
c5aa993b | 507 | case TT_PROC_GET_EVENT_MASK: |
c906108c | 508 | return "TT_PROC_GET_EVENT_MASK"; |
c5aa993b | 509 | case TT_PROC_SET_EVENT_MASK: |
c906108c | 510 | return "TT_PROC_SET_EVENT_MASK"; |
c5aa993b | 511 | case TT_PROC_GET_FIRST_LWP_STATE: |
c906108c | 512 | return "TT_PROC_GET_FIRST_LWP_STATE"; |
c5aa993b | 513 | case TT_PROC_GET_NEXT_LWP_STATE: |
c906108c | 514 | return "TT_PROC_GET_NEXT_LWP_STATE"; |
c5aa993b | 515 | case TT_PROC_EXIT: |
c906108c | 516 | return "TT_PROC_EXIT"; |
c5aa993b | 517 | case TT_PROC_GET_MPROTECT: |
c906108c | 518 | return "TT_PROC_GET_MPROTECT"; |
c5aa993b | 519 | case TT_PROC_SET_MPROTECT: |
c906108c | 520 | return "TT_PROC_SET_MPROTECT"; |
c5aa993b | 521 | case TT_PROC_SET_SCBM: |
c906108c | 522 | return "TT_PROC_SET_SCBM"; |
c5aa993b | 523 | case TT_LWP_STOP: |
c906108c | 524 | return "TT_LWP_STOP"; |
c5aa993b | 525 | case TT_LWP_CONTINUE: |
c906108c | 526 | return "TT_LWP_CONTINUE"; |
c5aa993b | 527 | case TT_LWP_SINGLE: |
c906108c | 528 | return "TT_LWP_SINGLE"; |
c5aa993b | 529 | case TT_LWP_RUREGS: |
c906108c | 530 | return "TT_LWP_RUREGS"; |
c5aa993b | 531 | case TT_LWP_WUREGS: |
c906108c | 532 | return "TT_LWP_WUREGS"; |
c5aa993b | 533 | case TT_LWP_GET_EVENT_MASK: |
c906108c | 534 | return "TT_LWP_GET_EVENT_MASK"; |
c5aa993b | 535 | case TT_LWP_SET_EVENT_MASK: |
c906108c | 536 | return "TT_LWP_SET_EVENT_MASK"; |
c5aa993b | 537 | case TT_LWP_GET_STATE: |
c906108c | 538 | return "TT_LWP_GET_STATE"; |
c5aa993b | 539 | default: |
c906108c | 540 | return "?new req?"; |
c5aa993b | 541 | } |
c906108c | 542 | } |
c906108c | 543 | \f |
c5aa993b | 544 | |
c906108c SS |
545 | /* This function translates the process state enumeration into |
546 | * a character string that is its printable (aka "human readable") | |
547 | * name. | |
548 | */ | |
549 | static char * | |
fba45db2 | 550 | get_printable_name_of_process_state (process_state_t process_state) |
c906108c | 551 | { |
c5aa993b JM |
552 | switch (process_state) |
553 | { | |
c906108c SS |
554 | case STOPPED: |
555 | return "STOPPED"; | |
556 | case FAKE_STEPPING: | |
557 | return "FAKE_STEPPING"; | |
558 | case RUNNING: | |
559 | return "RUNNING"; | |
560 | case FORKING: | |
561 | return "FORKING"; | |
562 | case VFORKING: | |
563 | return "VFORKING"; | |
564 | default: | |
565 | return "?some unknown state?"; | |
c5aa993b | 566 | } |
c906108c SS |
567 | } |
568 | ||
569 | /* Set a ttrace thread state to a safe, initial state. | |
570 | */ | |
571 | static void | |
fba45db2 | 572 | clear_ttstate_t (ttstate_t *tts) |
c906108c | 573 | { |
c5aa993b JM |
574 | tts->tts_pid = 0; |
575 | tts->tts_lwpid = 0; | |
576 | tts->tts_user_tid = 0; | |
577 | tts->tts_event = TTEVT_NONE; | |
c906108c SS |
578 | } |
579 | ||
580 | /* Copy ttrace thread state TTS_FROM into TTS_TO. | |
581 | */ | |
582 | static void | |
fba45db2 | 583 | copy_ttstate_t (ttstate_t *tts_to, ttstate_t *tts_from) |
c906108c | 584 | { |
c5aa993b | 585 | memcpy ((char *) tts_to, (char *) tts_from, sizeof (*tts_to)); |
c906108c SS |
586 | } |
587 | ||
588 | /* Are there any live threads we know about? | |
589 | */ | |
c5aa993b | 590 | static int |
fba45db2 | 591 | any_thread_records (void) |
c906108c | 592 | { |
c5aa993b | 593 | return (thread_head.count > 0); |
c906108c SS |
594 | } |
595 | ||
596 | /* Create, fill in and link in a thread descriptor. | |
597 | */ | |
598 | static thread_info * | |
fba45db2 | 599 | create_thread_info (int pid, lwpid_t tid) |
c906108c | 600 | { |
c5aa993b JM |
601 | thread_info *new_p; |
602 | thread_info *p; | |
603 | int thread_count_of_pid; | |
604 | ||
3c37485b | 605 | new_p = xmalloc (sizeof (thread_info)); |
c5aa993b JM |
606 | new_p->pid = pid; |
607 | new_p->tid = tid; | |
608 | new_p->have_signal = 0; | |
609 | new_p->have_start = 0; | |
610 | new_p->have_state = 0; | |
611 | clear_ttstate_t (&new_p->last_stop_state); | |
612 | new_p->am_pseudo = 0; | |
613 | new_p->handled = 0; | |
614 | new_p->seen = 0; | |
615 | new_p->terminated = 0; | |
616 | new_p->next = NULL; | |
617 | new_p->next_pseudo = NULL; | |
618 | new_p->stepping_mode = DO_DEFAULT; | |
619 | ||
620 | if (0 == thread_head.count) | |
621 | { | |
c906108c | 622 | #ifdef THREAD_DEBUG |
c5aa993b JM |
623 | if (debug_on) |
624 | printf ("First thread, pid %d tid %d!\n", pid, tid); | |
c906108c | 625 | #endif |
c5aa993b | 626 | saved_real_pid = inferior_pid; |
c906108c | 627 | } |
c5aa993b JM |
628 | else |
629 | { | |
c906108c | 630 | #ifdef THREAD_DEBUG |
c5aa993b JM |
631 | if (debug_on) |
632 | printf ("Subsequent thread, pid %d tid %d\n", pid, tid); | |
c906108c SS |
633 | #endif |
634 | } | |
635 | ||
c5aa993b JM |
636 | /* Another day, another thread... |
637 | */ | |
638 | thread_head.count++; | |
c906108c | 639 | |
c5aa993b JM |
640 | /* The new thread always goes at the head of the list. |
641 | */ | |
642 | new_p->next = thread_head.head; | |
643 | thread_head.head = new_p; | |
c906108c | 644 | |
c5aa993b JM |
645 | /* Is this the "pseudo" thread of a process? It is if there's |
646 | * no other thread for this process on the list. (Note that this | |
647 | * accomodates multiple processes, such as we see even for simple | |
648 | * cases like forking "non-threaded" programs.) | |
649 | */ | |
650 | p = thread_head.head; | |
651 | thread_count_of_pid = 0; | |
652 | while (p) | |
653 | { | |
654 | if (p->pid == new_p->pid) | |
655 | thread_count_of_pid++; | |
656 | p = p->next; | |
657 | } | |
658 | ||
659 | /* Did we see any other threads for this pid? (Recall that we just | |
660 | * added this thread to the list...) | |
661 | */ | |
662 | if (thread_count_of_pid == 1) | |
663 | { | |
664 | new_p->am_pseudo = 1; | |
665 | new_p->next_pseudo = thread_head.head_pseudo; | |
666 | thread_head.head_pseudo = new_p; | |
667 | } | |
668 | ||
669 | return new_p; | |
c906108c SS |
670 | } |
671 | ||
672 | /* Get rid of our thread info. | |
673 | */ | |
674 | static void | |
fba45db2 | 675 | clear_thread_info (void) |
c906108c | 676 | { |
c5aa993b JM |
677 | thread_info *p; |
678 | thread_info *q; | |
c906108c SS |
679 | |
680 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
681 | if (debug_on) |
682 | printf ("Clearing all thread info\n"); | |
c906108c SS |
683 | #endif |
684 | ||
c5aa993b JM |
685 | p = thread_head.head; |
686 | while (p) | |
687 | { | |
688 | q = p; | |
689 | p = p->next; | |
b8c9b27d | 690 | xfree (q); |
c906108c SS |
691 | } |
692 | ||
c5aa993b JM |
693 | thread_head.head = NULL; |
694 | thread_head.head_pseudo = NULL; | |
695 | thread_head.count = 0; | |
c906108c | 696 | |
c5aa993b JM |
697 | p = deleted_threads.head; |
698 | while (p) | |
699 | { | |
700 | q = p; | |
701 | p = p->next; | |
b8c9b27d | 702 | xfree (q); |
c906108c SS |
703 | } |
704 | ||
c5aa993b JM |
705 | deleted_threads.head = NULL; |
706 | deleted_threads.head_pseudo = NULL; | |
707 | deleted_threads.count = 0; | |
c906108c | 708 | |
c5aa993b JM |
709 | /* No threads, so can't have pending events. |
710 | */ | |
711 | more_events_left = 0; | |
c906108c SS |
712 | } |
713 | ||
714 | /* Given a tid, find the thread block for it. | |
715 | */ | |
716 | static thread_info * | |
fba45db2 | 717 | find_thread_info (lwpid_t tid) |
c906108c | 718 | { |
c5aa993b | 719 | thread_info *p; |
c906108c | 720 | |
c5aa993b JM |
721 | for (p = thread_head.head; p; p = p->next) |
722 | { | |
723 | if (p->tid == tid) | |
724 | { | |
725 | return p; | |
726 | } | |
c906108c SS |
727 | } |
728 | ||
c5aa993b JM |
729 | for (p = deleted_threads.head; p; p = p->next) |
730 | { | |
731 | if (p->tid == tid) | |
732 | { | |
733 | return p; | |
734 | } | |
c906108c | 735 | } |
c5aa993b JM |
736 | |
737 | return NULL; | |
c906108c SS |
738 | } |
739 | ||
740 | /* For any but the pseudo thread, this maps to the | |
741 | * thread ID. For the pseudo thread, if you pass either | |
742 | * the thread id or the PID, you get the pseudo thread ID. | |
743 | * | |
744 | * We have to be prepared for core gdb to ask about | |
745 | * deleted threads. We do the map, but we don't like it. | |
746 | */ | |
747 | static lwpid_t | |
fba45db2 | 748 | map_from_gdb_tid (lwpid_t gdb_tid) |
c906108c | 749 | { |
c5aa993b | 750 | thread_info *p; |
c906108c | 751 | |
c5aa993b JM |
752 | /* First assume gdb_tid really is a tid, and try to find a |
753 | * matching entry on the threads list. | |
754 | */ | |
755 | for (p = thread_head.head; p; p = p->next) | |
756 | { | |
757 | if (p->tid == gdb_tid) | |
758 | return gdb_tid; | |
c906108c SS |
759 | } |
760 | ||
c5aa993b JM |
761 | /* It doesn't appear to be a tid; perhaps it's really a pid? |
762 | * Try to find a "pseudo" thread entry on the threads list. | |
763 | */ | |
764 | for (p = thread_head.head_pseudo; p != NULL; p = p->next_pseudo) | |
765 | { | |
766 | if (p->pid == gdb_tid) | |
767 | return p->tid; | |
c906108c SS |
768 | } |
769 | ||
c5aa993b JM |
770 | /* Perhaps it's the tid of a deleted thread we may still |
771 | * have some knowledge of? | |
772 | */ | |
773 | for (p = deleted_threads.head; p; p = p->next) | |
774 | { | |
775 | if (p->tid == gdb_tid) | |
776 | return gdb_tid; | |
777 | } | |
c906108c | 778 | |
c5aa993b JM |
779 | /* Or perhaps it's the pid of a deleted process we may still |
780 | * have knowledge of? | |
781 | */ | |
782 | for (p = deleted_threads.head_pseudo; p != NULL; p = p->next_pseudo) | |
783 | { | |
784 | if (p->pid == gdb_tid) | |
785 | return p->tid; | |
786 | } | |
787 | ||
788 | return 0; /* Error? */ | |
c906108c SS |
789 | } |
790 | ||
791 | /* Map the other way: from a real tid to the | |
792 | * "pid" known by core gdb. This tid may be | |
793 | * for a thread that just got deleted, so we | |
794 | * also need to consider deleted threads. | |
795 | */ | |
796 | static lwpid_t | |
fba45db2 | 797 | map_to_gdb_tid (lwpid_t real_tid) |
c906108c | 798 | { |
c5aa993b | 799 | thread_info *p; |
c906108c | 800 | |
c5aa993b JM |
801 | for (p = thread_head.head; p; p = p->next) |
802 | { | |
803 | if (p->tid == real_tid) | |
804 | { | |
805 | if (p->am_pseudo) | |
806 | return p->pid; | |
807 | else | |
808 | return real_tid; | |
809 | } | |
c906108c SS |
810 | } |
811 | ||
c5aa993b JM |
812 | for (p = deleted_threads.head; p; p = p->next) |
813 | { | |
814 | if (p->tid == real_tid) | |
815 | if (p->am_pseudo) | |
816 | return p->pid; /* Error? */ | |
817 | else | |
818 | return real_tid; | |
c906108c SS |
819 | } |
820 | ||
c5aa993b | 821 | return 0; /* Error? Never heard of this thread! */ |
c906108c SS |
822 | } |
823 | ||
824 | /* Do any threads have saved signals? | |
825 | */ | |
c5aa993b | 826 | static int |
fba45db2 | 827 | saved_signals_exist (void) |
c906108c | 828 | { |
c5aa993b JM |
829 | thread_info *p; |
830 | ||
831 | for (p = thread_head.head; p; p = p->next) | |
832 | { | |
833 | if (p->have_signal) | |
834 | { | |
835 | return 1; | |
836 | } | |
c906108c SS |
837 | } |
838 | ||
c5aa993b | 839 | return 0; |
c906108c SS |
840 | } |
841 | ||
842 | /* Is this the tid for the zero-th thread? | |
843 | */ | |
c5aa993b | 844 | static int |
fba45db2 | 845 | is_pseudo_thread (lwpid_t tid) |
c906108c | 846 | { |
c5aa993b JM |
847 | thread_info *p = find_thread_info (tid); |
848 | if (NULL == p || p->terminated) | |
849 | return 0; | |
850 | else | |
851 | return p->am_pseudo; | |
c906108c SS |
852 | } |
853 | ||
854 | /* Is this thread terminated? | |
855 | */ | |
c5aa993b | 856 | static int |
fba45db2 | 857 | is_terminated (lwpid_t tid) |
c906108c | 858 | { |
c5aa993b | 859 | thread_info *p = find_thread_info (tid); |
c906108c | 860 | |
c5aa993b JM |
861 | if (NULL != p) |
862 | return p->terminated; | |
c906108c | 863 | |
c5aa993b | 864 | return 0; |
c906108c SS |
865 | } |
866 | ||
867 | /* Is this pid a real PID or a TID? | |
868 | */ | |
c5aa993b | 869 | static int |
fba45db2 | 870 | is_process_id (int pid) |
c906108c | 871 | { |
c5aa993b JM |
872 | lwpid_t tid; |
873 | thread_info *tinfo; | |
874 | pid_t this_pid; | |
875 | int this_pid_count; | |
c906108c SS |
876 | |
877 | /* What does PID really represent? | |
878 | */ | |
879 | tid = map_from_gdb_tid (pid); | |
880 | if (tid <= 0) | |
c5aa993b | 881 | return 0; /* Actually, is probably an error... */ |
c906108c SS |
882 | |
883 | tinfo = find_thread_info (tid); | |
884 | ||
885 | /* Does it appear to be a true thread? | |
886 | */ | |
c5aa993b | 887 | if (!tinfo->am_pseudo) |
c906108c SS |
888 | return 0; |
889 | ||
890 | /* Else, it looks like it may be a process. See if there's any other | |
891 | * threads with the same process ID, though. If there are, then TID | |
892 | * just happens to be the first thread of several for this process. | |
893 | */ | |
894 | this_pid = tinfo->pid; | |
895 | this_pid_count = 0; | |
896 | for (tinfo = thread_head.head; tinfo; tinfo = tinfo->next) | |
897 | { | |
898 | if (tinfo->pid == this_pid) | |
c5aa993b | 899 | this_pid_count++; |
c906108c SS |
900 | } |
901 | ||
902 | return (this_pid_count == 1); | |
903 | } | |
904 | ||
905 | ||
906 | /* Add a thread to our info. Prevent duplicate entries. | |
907 | */ | |
908 | static thread_info * | |
fba45db2 | 909 | add_tthread (int pid, lwpid_t tid) |
c906108c | 910 | { |
c5aa993b | 911 | thread_info *p; |
c906108c | 912 | |
c5aa993b JM |
913 | p = find_thread_info (tid); |
914 | if (NULL == p) | |
915 | p = create_thread_info (pid, tid); | |
c906108c | 916 | |
c5aa993b | 917 | return p; |
c906108c SS |
918 | } |
919 | ||
920 | /* Notice that a thread was deleted. | |
921 | */ | |
922 | static void | |
fba45db2 | 923 | del_tthread (lwpid_t tid) |
c906108c | 924 | { |
c5aa993b JM |
925 | thread_info *p; |
926 | thread_info *chase; | |
c906108c | 927 | |
c5aa993b JM |
928 | if (thread_head.count <= 0) |
929 | { | |
930 | error ("Internal error in thread database."); | |
931 | return; | |
c906108c SS |
932 | } |
933 | ||
c5aa993b JM |
934 | chase = NULL; |
935 | for (p = thread_head.head; p; p = p->next) | |
936 | { | |
937 | if (p->tid == tid) | |
938 | { | |
c906108c SS |
939 | |
940 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
941 | if (debug_on) |
942 | printf ("Delete here: %d \n", tid); | |
c906108c SS |
943 | #endif |
944 | ||
c5aa993b JM |
945 | if (p->am_pseudo) |
946 | { | |
947 | /* | |
948 | * Deleting a main thread is ok if we're doing | |
949 | * a parent-follow on a child; this is odd but | |
950 | * not wrong. It apparently _doesn't_ happen | |
951 | * on the child-follow, as we don't just delete | |
952 | * the pseudo while keeping the rest of the | |
953 | * threads around--instead, we clear out the whole | |
954 | * thread list at once. | |
955 | */ | |
956 | thread_info *q; | |
957 | thread_info *q_chase; | |
958 | ||
959 | q_chase = NULL; | |
960 | for (q = thread_head.head_pseudo; q; q = q->next) | |
961 | { | |
962 | if (q == p) | |
963 | { | |
964 | /* Remove from pseudo list. | |
965 | */ | |
966 | if (q_chase == NULL) | |
967 | thread_head.head_pseudo = p->next_pseudo; | |
968 | else | |
969 | q_chase->next = p->next_pseudo; | |
970 | } | |
971 | else | |
972 | q_chase = q; | |
973 | } | |
974 | } | |
975 | ||
976 | /* Remove from live list. | |
977 | */ | |
978 | thread_head.count--; | |
979 | ||
980 | if (NULL == chase) | |
981 | thread_head.head = p->next; | |
982 | else | |
983 | chase->next = p->next; | |
984 | ||
985 | /* Add to deleted thread list. | |
986 | */ | |
987 | p->next = deleted_threads.head; | |
988 | deleted_threads.head = p; | |
989 | deleted_threads.count++; | |
990 | if (p->am_pseudo) | |
991 | { | |
992 | p->next_pseudo = deleted_threads.head_pseudo; | |
993 | deleted_threads.head_pseudo = p; | |
994 | } | |
995 | p->terminated = 1; | |
996 | ||
997 | return; | |
998 | } | |
999 | ||
1000 | else | |
1001 | chase = p; | |
c906108c SS |
1002 | } |
1003 | } | |
1004 | ||
1005 | /* Get the pid for this tid. (Has to be a real TID!). | |
1006 | */ | |
1007 | static int | |
fba45db2 | 1008 | get_pid_for (lwpid_t tid) |
c906108c | 1009 | { |
c5aa993b | 1010 | thread_info *p; |
c906108c | 1011 | |
c5aa993b JM |
1012 | for (p = thread_head.head; p; p = p->next) |
1013 | { | |
1014 | if (p->tid == tid) | |
1015 | { | |
1016 | return p->pid; | |
1017 | } | |
c906108c SS |
1018 | } |
1019 | ||
c5aa993b JM |
1020 | for (p = deleted_threads.head; p; p = p->next) |
1021 | { | |
1022 | if (p->tid == tid) | |
1023 | { | |
1024 | return p->pid; | |
1025 | } | |
c906108c | 1026 | } |
c5aa993b JM |
1027 | |
1028 | return 0; | |
c906108c SS |
1029 | } |
1030 | ||
1031 | /* Note that this thread's current event has been handled. | |
1032 | */ | |
1033 | static void | |
fba45db2 | 1034 | set_handled (int pid, lwpid_t tid) |
c906108c | 1035 | { |
c5aa993b JM |
1036 | thread_info *p; |
1037 | ||
1038 | p = find_thread_info (tid); | |
1039 | if (NULL == p) | |
1040 | p = add_tthread (pid, tid); | |
c906108c | 1041 | |
c5aa993b | 1042 | p->handled = 1; |
c906108c SS |
1043 | } |
1044 | ||
1045 | /* Was this thread's current event handled? | |
1046 | */ | |
c5aa993b | 1047 | static int |
fba45db2 | 1048 | was_handled (lwpid_t tid) |
c906108c | 1049 | { |
c5aa993b JM |
1050 | thread_info *p; |
1051 | ||
1052 | p = find_thread_info (tid); | |
1053 | if (NULL != p) | |
1054 | return p->handled; | |
c906108c | 1055 | |
c5aa993b | 1056 | return 0; /* New threads have not been handled */ |
c906108c SS |
1057 | } |
1058 | ||
1059 | /* Set this thread to unhandled. | |
1060 | */ | |
1061 | static void | |
fba45db2 | 1062 | clear_handled (lwpid_t tid) |
c906108c | 1063 | { |
c5aa993b JM |
1064 | thread_info *p; |
1065 | ||
c906108c | 1066 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1067 | if (debug_on) |
1068 | printf ("clear_handled %d\n", (int) tid); | |
c906108c SS |
1069 | #endif |
1070 | ||
1071 | p = find_thread_info (tid); | |
1072 | if (p == NULL) | |
1073 | error ("Internal error: No thread state to clear?"); | |
1074 | ||
1075 | p->handled = 0; | |
1076 | } | |
1077 | ||
1078 | /* Set all threads to unhandled. | |
1079 | */ | |
1080 | static void | |
fba45db2 | 1081 | clear_all_handled (void) |
c906108c | 1082 | { |
c5aa993b | 1083 | thread_info *p; |
c906108c SS |
1084 | |
1085 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
1086 | if (debug_on) |
1087 | printf ("clear_all_handled\n"); | |
c906108c SS |
1088 | #endif |
1089 | ||
c5aa993b JM |
1090 | for (p = thread_head.head; p; p = p->next) |
1091 | { | |
1092 | p->handled = 0; | |
c906108c SS |
1093 | } |
1094 | ||
c5aa993b JM |
1095 | for (p = deleted_threads.head; p; p = p->next) |
1096 | { | |
1097 | p->handled = 0; | |
c906108c SS |
1098 | } |
1099 | } | |
1100 | ||
1101 | /* Set this thread to default stepping mode. | |
1102 | */ | |
1103 | static void | |
fba45db2 | 1104 | clear_stepping_mode (lwpid_t tid) |
c906108c | 1105 | { |
c5aa993b JM |
1106 | thread_info *p; |
1107 | ||
c906108c | 1108 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1109 | if (debug_on) |
1110 | printf ("clear_stepping_mode %d\n", (int) tid); | |
c906108c SS |
1111 | #endif |
1112 | ||
1113 | p = find_thread_info (tid); | |
1114 | if (p == NULL) | |
1115 | error ("Internal error: No thread state to clear?"); | |
1116 | ||
1117 | p->stepping_mode = DO_DEFAULT; | |
1118 | } | |
1119 | ||
1120 | /* Set all threads to do default continue on resume. | |
1121 | */ | |
1122 | static void | |
fba45db2 | 1123 | clear_all_stepping_mode (void) |
c906108c | 1124 | { |
c5aa993b | 1125 | thread_info *p; |
c906108c SS |
1126 | |
1127 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
1128 | if (debug_on) |
1129 | printf ("clear_all_stepping_mode\n"); | |
c906108c SS |
1130 | #endif |
1131 | ||
c5aa993b JM |
1132 | for (p = thread_head.head; p; p = p->next) |
1133 | { | |
1134 | p->stepping_mode = DO_DEFAULT; | |
c906108c SS |
1135 | } |
1136 | ||
c5aa993b JM |
1137 | for (p = deleted_threads.head; p; p = p->next) |
1138 | { | |
1139 | p->stepping_mode = DO_DEFAULT; | |
c906108c SS |
1140 | } |
1141 | } | |
1142 | ||
1143 | /* Set all threads to unseen on this pass. | |
c5aa993b | 1144 | */ |
c906108c | 1145 | static void |
fba45db2 | 1146 | set_all_unseen (void) |
c906108c | 1147 | { |
c5aa993b | 1148 | thread_info *p; |
c906108c | 1149 | |
c5aa993b JM |
1150 | for (p = thread_head.head; p; p = p->next) |
1151 | { | |
1152 | p->seen = 0; | |
c906108c SS |
1153 | } |
1154 | } | |
1155 | ||
1156 | #if (defined( THREAD_DEBUG ) || defined( PARANOIA )) | |
1157 | /* debugging routine. | |
1158 | */ | |
1159 | static void | |
fba45db2 | 1160 | print_tthread (thread_info *p) |
c906108c | 1161 | { |
c5aa993b JM |
1162 | printf (" Thread pid %d, tid %d", p->pid, p->tid); |
1163 | if (p->have_state) | |
1164 | printf (", event is %s", | |
1165 | get_printable_name_of_ttrace_event (p->last_stop_state.tts_event)); | |
1166 | ||
1167 | if (p->am_pseudo) | |
1168 | printf (", pseudo thread"); | |
1169 | ||
1170 | if (p->have_signal) | |
1171 | printf (", have signal 0x%x", p->signal_value); | |
1172 | ||
1173 | if (p->have_start) | |
1174 | printf (", have start at 0x%x", p->start); | |
1175 | ||
1176 | printf (", step is %s", get_printable_name_of_stepping_mode (p->stepping_mode)); | |
1177 | ||
1178 | if (p->handled) | |
1179 | printf (", handled"); | |
1180 | else | |
1181 | printf (", not handled"); | |
1182 | ||
1183 | if (p->seen) | |
1184 | printf (", seen"); | |
1185 | else | |
1186 | printf (", not seen"); | |
1187 | ||
1188 | printf ("\n"); | |
c906108c SS |
1189 | } |
1190 | ||
1191 | static void | |
fba45db2 | 1192 | print_tthreads (void) |
c906108c | 1193 | { |
c5aa993b JM |
1194 | thread_info *p; |
1195 | ||
1196 | if (thread_head.count == 0) | |
1197 | printf ("Thread list is empty\n"); | |
1198 | else | |
1199 | { | |
1200 | printf ("Thread list has "); | |
1201 | if (thread_head.count == 1) | |
1202 | printf ("1 entry:\n"); | |
1203 | else | |
1204 | printf ("%d entries:\n", thread_head.count); | |
1205 | for (p = thread_head.head; p; p = p->next) | |
1206 | { | |
1207 | print_tthread (p); | |
1208 | } | |
1209 | } | |
1210 | ||
1211 | if (deleted_threads.count == 0) | |
1212 | printf ("Deleted thread list is empty\n"); | |
1213 | else | |
1214 | { | |
1215 | printf ("Deleted thread list has "); | |
1216 | if (deleted_threads.count == 1) | |
1217 | printf ("1 entry:\n"); | |
1218 | else | |
1219 | printf ("%d entries:\n", deleted_threads.count); | |
1220 | ||
1221 | for (p = deleted_threads.head; p; p = p->next) | |
1222 | { | |
1223 | print_tthread (p); | |
1224 | } | |
c906108c SS |
1225 | } |
1226 | } | |
1227 | #endif | |
1228 | ||
1229 | /* Update the thread list based on the "seen" bits. | |
1230 | */ | |
1231 | static void | |
fba45db2 | 1232 | update_thread_list (void) |
c906108c | 1233 | { |
c5aa993b JM |
1234 | thread_info *p; |
1235 | thread_info *chase; | |
c906108c | 1236 | |
c5aa993b JM |
1237 | chase = NULL; |
1238 | for (p = thread_head.head; p; p = p->next) | |
1239 | { | |
c906108c SS |
1240 | /* Is this an "unseen" thread which really happens to be a process? |
1241 | If so, is it inferior_pid and is a vfork in flight? If yes to | |
1242 | all, then DON'T REMOVE IT! We're in the midst of moving a vfork | |
1243 | operation, which is a multiple step thing, to the point where we | |
1244 | can touch the parent again. We've most likely stopped to examine | |
1245 | the child at a late stage in the vfork, and if we're not following | |
1246 | the child, we'd best not treat the parent as a dead "thread"... | |
c5aa993b JM |
1247 | */ |
1248 | if ((!p->seen) && p->am_pseudo && vfork_in_flight | |
1249 | && (p->pid != vforking_child_pid)) | |
1250 | p->seen = 1; | |
c906108c | 1251 | |
c5aa993b JM |
1252 | if (!p->seen) |
1253 | { | |
1254 | /* Remove this one | |
1255 | */ | |
c906108c SS |
1256 | |
1257 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1258 | if (debug_on) |
1259 | printf ("Delete unseen thread: %d \n", p->tid); | |
c906108c | 1260 | #endif |
c5aa993b JM |
1261 | del_tthread (p->tid); |
1262 | } | |
c906108c SS |
1263 | } |
1264 | } | |
c906108c | 1265 | \f |
c5aa993b JM |
1266 | |
1267 | ||
c906108c SS |
1268 | /************************************************ |
1269 | * O/S call wrappers * | |
1270 | ************************************************ | |
1271 | */ | |
1272 | ||
1273 | /* This function simply calls ttrace with the given arguments. | |
1274 | * It exists so that all calls to ttrace are isolated. All | |
1275 | * parameters should be as specified by "man 2 ttrace". | |
1276 | * | |
1277 | * No other "raw" calls to ttrace should exist in this module. | |
1278 | */ | |
1279 | static int | |
fba45db2 KB |
1280 | call_real_ttrace (ttreq_t request, pid_t pid, lwpid_t tid, TTRACE_ARG_TYPE addr, |
1281 | TTRACE_ARG_TYPE data, TTRACE_ARG_TYPE addr2) | |
c906108c | 1282 | { |
c5aa993b | 1283 | int tt_status; |
c906108c SS |
1284 | |
1285 | errno = 0; | |
c5aa993b | 1286 | tt_status = ttrace (request, pid, tid, addr, data, addr2); |
c906108c SS |
1287 | |
1288 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1289 | if (errno) |
1290 | { | |
1291 | /* Don't bother for a known benign error: if you ask for the | |
1292 | * first thread state, but there is only one thread and it's | |
1293 | * not stopped, ttrace complains. | |
1294 | * | |
1295 | * We have this inside the #ifdef because our caller will do | |
1296 | * this check for real. | |
1297 | */ | |
1298 | if (request != TT_PROC_GET_FIRST_LWP_STATE | |
1299 | || errno != EPROTO) | |
1300 | { | |
1301 | if (debug_on) | |
1302 | printf ("TT fail for %s, with pid %d, tid %d, status %d \n", | |
1303 | get_printable_name_of_ttrace_request (request), | |
1304 | pid, tid, tt_status); | |
1305 | } | |
c906108c | 1306 | } |
c906108c SS |
1307 | #endif |
1308 | ||
1309 | #if 0 | |
1310 | /* ??rehrauer: It would probably be most robust to catch and report | |
1311 | * failed requests here. However, some clients of this interface | |
1312 | * seem to expect to catch & deal with them, so we'd best not. | |
1313 | */ | |
c5aa993b JM |
1314 | if (errno) |
1315 | { | |
1316 | strcpy (reason_for_failure, "ttrace ("); | |
1317 | strcat (reason_for_failure, get_printable_name_of_ttrace_request (request)); | |
1318 | strcat (reason_for_failure, ")"); | |
1319 | printf ("ttrace error, errno = %d\n", errno); | |
1320 | perror_with_name (reason_for_failure); | |
1321 | } | |
c906108c SS |
1322 | #endif |
1323 | ||
1324 | return tt_status; | |
1325 | } | |
c906108c | 1326 | \f |
c5aa993b | 1327 | |
c906108c SS |
1328 | /* This function simply calls ttrace_wait with the given arguments. |
1329 | * It exists so that all calls to ttrace_wait are isolated. | |
1330 | * | |
1331 | * No "raw" calls to ttrace_wait should exist elsewhere. | |
1332 | */ | |
1333 | static int | |
fba45db2 KB |
1334 | call_real_ttrace_wait (int pid, lwpid_t tid, ttwopt_t option, ttstate_t *tsp, |
1335 | size_t tsp_size) | |
c906108c | 1336 | { |
c5aa993b JM |
1337 | int ttw_status; |
1338 | thread_info *tinfo = NULL; | |
c906108c SS |
1339 | |
1340 | errno = 0; | |
1341 | ttw_status = ttrace_wait (pid, tid, option, tsp, tsp_size); | |
c5aa993b JM |
1342 | |
1343 | if (errno) | |
1344 | { | |
c906108c | 1345 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1346 | if (debug_on) |
1347 | printf ("TW fail with pid %d, tid %d \n", pid, tid); | |
c906108c SS |
1348 | #endif |
1349 | ||
1350 | perror_with_name ("ttrace wait"); | |
c5aa993b | 1351 | } |
c906108c SS |
1352 | |
1353 | return ttw_status; | |
1354 | } | |
c906108c | 1355 | \f |
c5aa993b | 1356 | |
c906108c SS |
1357 | /* A process may have one or more kernel threads, of which all or |
1358 | none may be stopped. This function returns the ID of the first | |
1359 | kernel thread in a stopped state, or 0 if none are stopped. | |
1360 | ||
1361 | This function can be used with get_process_next_stopped_thread_id | |
1362 | to iterate over the IDs of all stopped threads of this process. | |
1363 | */ | |
1364 | static lwpid_t | |
fba45db2 | 1365 | get_process_first_stopped_thread_id (int pid, ttstate_t *thread_state) |
c906108c | 1366 | { |
c5aa993b | 1367 | int tt_status; |
c906108c | 1368 | |
a0b3c4fd JM |
1369 | tt_status = call_real_ttrace (TT_PROC_GET_FIRST_LWP_STATE, |
1370 | (pid_t) pid, | |
1371 | (lwpid_t) TT_NIL, | |
1372 | (TTRACE_ARG_TYPE) thread_state, | |
1373 | (TTRACE_ARG_TYPE) sizeof (*thread_state), | |
1374 | TT_NIL); | |
c5aa993b JM |
1375 | |
1376 | if (errno) | |
1377 | { | |
1378 | if (errno == EPROTO) | |
1379 | { | |
1380 | /* This is an error we can handle: there isn't any stopped | |
1381 | * thread. This happens when we're re-starting the application | |
1382 | * and it has only one thread. GET_NEXT handles the case of | |
1383 | * no more stopped threads well; GET_FIRST doesn't. (A ttrace | |
1384 | * "feature".) | |
1385 | */ | |
1386 | tt_status = 1; | |
1387 | errno = 0; | |
1388 | return 0; | |
1389 | } | |
1390 | else | |
1391 | perror_with_name ("ttrace"); | |
1392 | } | |
1393 | ||
1394 | if (tt_status < 0) | |
c906108c SS |
1395 | /* Failed somehow. |
1396 | */ | |
1397 | return 0; | |
1398 | ||
1399 | return thread_state->tts_lwpid; | |
1400 | } | |
c906108c | 1401 | \f |
c5aa993b | 1402 | |
c906108c SS |
1403 | /* This function returns the ID of the "next" kernel thread in a |
1404 | stopped state, or 0 if there are none. "Next" refers to the | |
1405 | thread following that of the last successful call to this | |
1406 | function or to get_process_first_stopped_thread_id, using | |
1407 | the value of thread_state returned by that call. | |
1408 | ||
1409 | This function can be used with get_process_first_stopped_thread_id | |
1410 | to iterate over the IDs of all stopped threads of this process. | |
1411 | */ | |
1412 | static lwpid_t | |
fba45db2 | 1413 | get_process_next_stopped_thread_id (int pid, ttstate_t *thread_state) |
c906108c | 1414 | { |
c5aa993b | 1415 | int tt_status; |
c906108c SS |
1416 | |
1417 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
1418 | TT_PROC_GET_NEXT_LWP_STATE, |
1419 | (pid_t) pid, | |
1420 | (lwpid_t) TT_NIL, | |
1421 | (TTRACE_ARG_TYPE) thread_state, | |
1422 | (TTRACE_ARG_TYPE) sizeof (*thread_state), | |
1423 | TT_NIL); | |
c906108c SS |
1424 | if (errno) |
1425 | perror_with_name ("ttrace"); | |
1426 | ||
1427 | if (tt_status < 0) | |
1428 | /* Failed | |
1429 | */ | |
1430 | return 0; | |
1431 | ||
c5aa993b JM |
1432 | else if (tt_status == 0) |
1433 | { | |
1434 | /* End of list, no next state. Don't return the | |
1435 | * tts_lwpid, as it's a meaningless "240". | |
1436 | * | |
1437 | * This is an HPUX "feature". | |
1438 | */ | |
1439 | return 0; | |
1440 | } | |
1441 | ||
c906108c SS |
1442 | return thread_state->tts_lwpid; |
1443 | } | |
1444 | ||
1445 | /* ??rehrauer: Eventually this function perhaps should be calling | |
1446 | pid_to_thread_id. However, that function currently does nothing | |
1447 | for HP-UX. Even then, I'm not clear whether that function | |
1448 | will return a "kernel" thread ID, or a "user" thread ID. If | |
1449 | the former, we can just call it here. If the latter, we must | |
1450 | map from the "user" tid to a "kernel" tid. | |
1451 | ||
1452 | NOTE: currently not called. | |
1453 | */ | |
1454 | static lwpid_t | |
fba45db2 | 1455 | get_active_tid_of_pid (int pid) |
c906108c | 1456 | { |
c5aa993b | 1457 | ttstate_t thread_state; |
c906108c SS |
1458 | |
1459 | return get_process_first_stopped_thread_id (pid, &thread_state); | |
1460 | } | |
1461 | ||
1462 | /* This function returns 1 if tt_request is a ttrace request that | |
1463 | * operates upon all threads of a (i.e., the entire) process. | |
1464 | */ | |
1465 | int | |
fba45db2 | 1466 | is_process_ttrace_request (ttreq_t tt_request) |
c906108c SS |
1467 | { |
1468 | return IS_TTRACE_PROCREQ (tt_request); | |
1469 | } | |
c906108c | 1470 | \f |
c5aa993b | 1471 | |
c906108c SS |
1472 | /* This function translates a thread ttrace request into |
1473 | * the equivalent process request for a one-thread process. | |
1474 | */ | |
1475 | static ttreq_t | |
fba45db2 | 1476 | make_process_version (ttreq_t request) |
c906108c | 1477 | { |
c5aa993b JM |
1478 | if (!IS_TTRACE_REQ (request)) |
1479 | { | |
1480 | error ("Internal error, bad ttrace request made\n"); | |
1481 | return -1; | |
1482 | } | |
c906108c | 1483 | |
c5aa993b JM |
1484 | switch (request) |
1485 | { | |
1486 | case TT_LWP_STOP: | |
c906108c SS |
1487 | return TT_PROC_STOP; |
1488 | ||
c5aa993b | 1489 | case TT_LWP_CONTINUE: |
c906108c SS |
1490 | return TT_PROC_CONTINUE; |
1491 | ||
c5aa993b | 1492 | case TT_LWP_GET_EVENT_MASK: |
c906108c SS |
1493 | return TT_PROC_GET_EVENT_MASK; |
1494 | ||
c5aa993b | 1495 | case TT_LWP_SET_EVENT_MASK: |
c906108c SS |
1496 | return TT_PROC_SET_EVENT_MASK; |
1497 | ||
c5aa993b JM |
1498 | case TT_LWP_SINGLE: |
1499 | case TT_LWP_RUREGS: | |
1500 | case TT_LWP_WUREGS: | |
1501 | case TT_LWP_GET_STATE: | |
1502 | return -1; /* No equivalent */ | |
c906108c | 1503 | |
c5aa993b | 1504 | default: |
c906108c | 1505 | return request; |
c5aa993b | 1506 | } |
c906108c | 1507 | } |
c906108c | 1508 | \f |
c5aa993b | 1509 | |
c906108c SS |
1510 | /* This function translates the "pid" used by the rest of |
1511 | * gdb to a real pid and a tid. It then calls "call_real_ttrace" | |
1512 | * with the given arguments. | |
1513 | * | |
1514 | * In general, other parts of this module should call this | |
1515 | * function when they are dealing with external users, who only | |
1516 | * have tids to pass (but they call it "pid" for historical | |
1517 | * reasons). | |
1518 | */ | |
1519 | static int | |
fba45db2 KB |
1520 | call_ttrace (ttreq_t request, int gdb_tid, TTRACE_ARG_TYPE addr, |
1521 | TTRACE_ARG_TYPE data, TTRACE_ARG_TYPE addr2) | |
c906108c | 1522 | { |
c5aa993b JM |
1523 | lwpid_t real_tid; |
1524 | int real_pid; | |
1525 | ttreq_t new_request; | |
1526 | int tt_status; | |
1527 | char reason_for_failure[100]; /* Arbitrary size, should be big enough. */ | |
1528 | ||
c906108c | 1529 | #ifdef THREAD_DEBUG |
c5aa993b | 1530 | int is_interesting = 0; |
c906108c | 1531 | |
c5aa993b JM |
1532 | if (TT_LWP_RUREGS == request) |
1533 | { | |
1534 | is_interesting = 1; /* Adjust code here as desired */ | |
1535 | } | |
1536 | ||
1537 | if (is_interesting && 0 && debug_on) | |
1538 | { | |
1539 | if (!is_process_ttrace_request (request)) | |
1540 | { | |
1541 | printf ("TT: Thread request, tid is %d", gdb_tid); | |
1542 | printf ("== SINGLE at %x", addr); | |
1543 | } | |
1544 | else | |
1545 | { | |
1546 | printf ("TT: Process request, tid is %d\n", gdb_tid); | |
1547 | printf ("==! SINGLE at %x", addr); | |
1548 | } | |
1549 | } | |
c906108c SS |
1550 | #endif |
1551 | ||
1552 | /* The initial SETTRC and SET_EVENT_MASK calls (and all others | |
1553 | * which happen before any threads get set up) should go | |
1554 | * directly to "call_real_ttrace", so they don't happen here. | |
1555 | * | |
1556 | * But hardware watchpoints do a SET_EVENT_MASK, so we can't | |
1557 | * rule them out.... | |
1558 | */ | |
1559 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1560 | if (request == TT_PROC_SETTRC && debug_on) |
1561 | printf ("Unexpected call for TT_PROC_SETTRC\n"); | |
c906108c SS |
1562 | #endif |
1563 | ||
1564 | /* Sometimes we get called with a bogus tid (e.g., if a | |
1565 | * thread has terminated, we return 0; inftarg later asks | |
1566 | * whether the thread has exited/forked/vforked). | |
1567 | */ | |
c5aa993b | 1568 | if (gdb_tid == 0) |
c906108c | 1569 | { |
c5aa993b | 1570 | errno = ESRCH; /* ttrace's response would probably be "No such process". */ |
c906108c SS |
1571 | return -1; |
1572 | } | |
1573 | ||
1574 | /* All other cases should be able to expect that there are | |
1575 | * thread records. | |
1576 | */ | |
c5aa993b JM |
1577 | if (!any_thread_records ()) |
1578 | { | |
c906108c | 1579 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1580 | if (debug_on) |
1581 | warning ("No thread records for ttrace call"); | |
c906108c | 1582 | #endif |
c5aa993b | 1583 | errno = ESRCH; /* ttrace's response would be "No such process". */ |
c906108c | 1584 | return -1; |
c5aa993b | 1585 | } |
c906108c SS |
1586 | |
1587 | /* OK, now the task is to translate the incoming tid into | |
1588 | * a pid/tid pair. | |
1589 | */ | |
c5aa993b JM |
1590 | real_tid = map_from_gdb_tid (gdb_tid); |
1591 | real_pid = get_pid_for (real_tid); | |
c906108c SS |
1592 | |
1593 | /* Now check the result. "Real_pid" is NULL if our list | |
1594 | * didn't find it. We have some tricks we can play to fix | |
1595 | * this, however. | |
1596 | */ | |
c5aa993b JM |
1597 | if (0 == real_pid) |
1598 | { | |
1599 | ttstate_t thread_state; | |
c906108c SS |
1600 | |
1601 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1602 | if (debug_on) |
1603 | printf ("No saved pid for tid %d\n", gdb_tid); | |
c906108c SS |
1604 | #endif |
1605 | ||
c5aa993b JM |
1606 | if (is_process_ttrace_request (request)) |
1607 | { | |
1608 | ||
1609 | /* Ok, we couldn't get a tid. Try to translate to | |
1610 | * the equivalent process operation. We expect this | |
1611 | * NOT to happen, so this is a desparation-type | |
1612 | * move. It can happen if there is an internal | |
1613 | * error and so no "wait()" call is ever done. | |
1614 | */ | |
1615 | new_request = make_process_version (request); | |
1616 | if (new_request == -1) | |
1617 | { | |
1618 | ||
c906108c | 1619 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1620 | if (debug_on) |
1621 | printf ("...and couldn't make process version of thread operation\n"); | |
c906108c SS |
1622 | #endif |
1623 | ||
c5aa993b JM |
1624 | /* Use hacky saved pid, which won't always be correct |
1625 | * in the multi-process future. Use tid as thread, | |
1626 | * probably dooming this to failure. FIX! | |
1627 | */ | |
1628 | if (saved_real_pid != 0) | |
1629 | { | |
c906108c | 1630 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1631 | if (debug_on) |
1632 | printf ("...using saved pid %d\n", saved_real_pid); | |
c906108c SS |
1633 | #endif |
1634 | ||
c5aa993b JM |
1635 | real_pid = saved_real_pid; |
1636 | real_tid = gdb_tid; | |
1637 | } | |
c906108c | 1638 | |
c5aa993b JM |
1639 | else |
1640 | error ("Unable to perform thread operation"); | |
1641 | } | |
c906108c | 1642 | |
c5aa993b JM |
1643 | else |
1644 | { | |
1645 | /* Sucessfully translated this to a process request, | |
1646 | * which needs no thread value. | |
1647 | */ | |
1648 | real_pid = gdb_tid; | |
1649 | real_tid = 0; | |
1650 | request = new_request; | |
c906108c SS |
1651 | |
1652 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1653 | if (debug_on) |
1654 | { | |
1655 | printf ("Translated thread request to process request\n"); | |
1656 | if (saved_real_pid == 0) | |
1657 | printf ("...but there's no saved pid\n"); | |
1658 | ||
1659 | else | |
1660 | { | |
1661 | if (gdb_tid != saved_real_pid) | |
1662 | printf ("...but have the wrong pid (%d rather than %d)\n", | |
1663 | gdb_tid, saved_real_pid); | |
1664 | } | |
1665 | } | |
c906108c | 1666 | #endif |
c5aa993b JM |
1667 | } /* Translated to a process request */ |
1668 | } /* Is a process request */ | |
c906108c | 1669 | |
c5aa993b JM |
1670 | else |
1671 | { | |
1672 | /* We have to have a thread. Ooops. | |
1673 | */ | |
1674 | error ("Thread request with no threads (%s)", | |
1675 | get_printable_name_of_ttrace_request (request)); | |
1676 | } | |
c906108c | 1677 | } |
c906108c SS |
1678 | |
1679 | /* Ttrace doesn't like to see tid values on process requests, | |
1680 | * even if we have the right one. | |
1681 | */ | |
c5aa993b JM |
1682 | if (is_process_ttrace_request (request)) |
1683 | { | |
c906108c | 1684 | real_tid = 0; |
c5aa993b JM |
1685 | } |
1686 | ||
c906108c | 1687 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1688 | if (is_interesting && 0 && debug_on) |
1689 | { | |
1690 | printf (" now tid %d, pid %d\n", real_tid, real_pid); | |
1691 | printf (" request is %s\n", get_printable_name_of_ttrace_request (request)); | |
1692 | } | |
c906108c SS |
1693 | #endif |
1694 | ||
1695 | /* Finally, the (almost) real call. | |
1696 | */ | |
1697 | tt_status = call_real_ttrace (request, real_pid, real_tid, addr, data, addr2); | |
1698 | ||
1699 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1700 | if (is_interesting && debug_on) |
1701 | { | |
1702 | if (!TT_OK (tt_status, errno) | |
1703 | && !(tt_status == 0 & errno == 0)) | |
1704 | printf (" got error (errno==%d, status==%d)\n", errno, tt_status); | |
1705 | } | |
c906108c SS |
1706 | #endif |
1707 | ||
1708 | return tt_status; | |
1709 | } | |
1710 | ||
1711 | ||
1712 | /* Stop all the threads of a process. | |
c5aa993b | 1713 | |
c906108c SS |
1714 | * NOTE: use of TT_PROC_STOP can cause a thread with a real event |
1715 | * to get a TTEVT_NONE event, discarding the old event. Be | |
1716 | * very careful, and only call TT_PROC_STOP when you mean it! | |
1717 | */ | |
1718 | static void | |
fba45db2 | 1719 | stop_all_threads_of_process (pid_t real_pid) |
c906108c | 1720 | { |
c5aa993b | 1721 | int ttw_status; |
c906108c SS |
1722 | |
1723 | ttw_status = call_real_ttrace (TT_PROC_STOP, | |
c5aa993b JM |
1724 | (pid_t) real_pid, |
1725 | (lwpid_t) TT_NIL, | |
1726 | (TTRACE_ARG_TYPE) TT_NIL, | |
1727 | (TTRACE_ARG_TYPE) TT_NIL, | |
1728 | TT_NIL); | |
c906108c SS |
1729 | if (errno) |
1730 | perror_with_name ("ttrace stop of other threads"); | |
1731 | } | |
1732 | ||
1733 | ||
1734 | /* Under some circumstances, it's unsafe to attempt to stop, or even | |
1735 | query the state of, a process' threads. | |
1736 | ||
1737 | In ttrace-based HP-UX, an example is a vforking child process. The | |
1738 | vforking parent and child are somewhat fragile, w/r/t what we can do | |
1739 | what we can do to them with ttrace, until after the child exits or | |
1740 | execs, or until the parent's vfork event is delivered. Until that | |
1741 | time, we must not try to stop the process' threads, or inquire how | |
1742 | many there are, or even alter its data segments, or it typically dies | |
1743 | with a SIGILL. Sigh. | |
1744 | ||
1745 | This function returns 1 if this stopped process, and the event that | |
1746 | we're told was responsible for its current stopped state, cannot safely | |
1747 | have its threads examined. | |
c5aa993b | 1748 | */ |
c906108c SS |
1749 | #define CHILD_VFORKED(evt,pid) \ |
1750 | (((evt) == TTEVT_VFORK) && ((pid) != inferior_pid)) | |
1751 | #define CHILD_URPED(evt,pid) \ | |
1752 | ((((evt) == TTEVT_EXEC) || ((evt) == TTEVT_EXIT)) && ((pid) != vforking_child_pid)) | |
1753 | #define PARENT_VFORKED(evt,pid) \ | |
1754 | (((evt) == TTEVT_VFORK) && ((pid) == inferior_pid)) | |
1755 | ||
1756 | static int | |
fba45db2 | 1757 | can_touch_threads_of_process (int pid, ttevents_t stopping_event) |
c906108c SS |
1758 | { |
1759 | if (CHILD_VFORKED (stopping_event, pid)) | |
1760 | { | |
1761 | vforking_child_pid = pid; | |
1762 | vfork_in_flight = 1; | |
1763 | } | |
1764 | ||
1765 | else if (vfork_in_flight && | |
c5aa993b JM |
1766 | (PARENT_VFORKED (stopping_event, pid) || |
1767 | CHILD_URPED (stopping_event, pid))) | |
c906108c SS |
1768 | { |
1769 | vfork_in_flight = 0; | |
1770 | vforking_child_pid = 0; | |
1771 | } | |
1772 | ||
c5aa993b | 1773 | return !vfork_in_flight; |
c906108c SS |
1774 | } |
1775 | ||
1776 | ||
1777 | /* If we can find an as-yet-unhandled thread state of a | |
1778 | * stopped thread of this process return 1 and set "tsp". | |
1779 | * Return 0 if we can't. | |
1780 | * | |
1781 | * If this function is used when the threads of PIS haven't | |
1782 | * been stopped, undefined behaviour is guaranteed! | |
1783 | */ | |
c5aa993b | 1784 | static int |
fba45db2 | 1785 | select_stopped_thread_of_process (int pid, ttstate_t *tsp) |
c906108c | 1786 | { |
c5aa993b JM |
1787 | lwpid_t candidate_tid, tid; |
1788 | ttstate_t candidate_tstate, tstate; | |
c906108c SS |
1789 | |
1790 | /* If we're not allowed to touch the process now, then just | |
1791 | * return the current value of *TSP. | |
1792 | * | |
1793 | * This supports "vfork". It's ok, really, to double the | |
1794 | * current event (the child EXEC, we hope!). | |
1795 | */ | |
c5aa993b | 1796 | if (!can_touch_threads_of_process (pid, tsp->tts_event)) |
c906108c SS |
1797 | return 1; |
1798 | ||
1799 | /* Decide which of (possibly more than one) events to | |
1800 | * return as the first one. We scan them all so that | |
1801 | * we always return the result of a fake-step first. | |
1802 | */ | |
1803 | candidate_tid = 0; | |
1804 | for (tid = get_process_first_stopped_thread_id (pid, &tstate); | |
1805 | tid != 0; | |
1806 | tid = get_process_next_stopped_thread_id (pid, &tstate)) | |
1807 | { | |
1808 | /* TTEVT_NONE events are uninteresting to our clients. They're | |
1809 | * an artifact of our "stop the world" model--the thread is | |
1810 | * stopped because we stopped it. | |
1811 | */ | |
c5aa993b JM |
1812 | if (tstate.tts_event == TTEVT_NONE) |
1813 | { | |
1814 | set_handled (pid, tstate.tts_lwpid); | |
1815 | } | |
c906108c SS |
1816 | |
1817 | /* Did we just single-step a single thread, without letting any | |
1818 | * of the others run? Is this an event for that thread? | |
1819 | * | |
1820 | * If so, we believe our client would prefer to see this event | |
1821 | * over any others. (Typically the client wants to just push | |
1822 | * one thread a little farther forward, and then go around | |
1823 | * checking for what all threads are doing.) | |
1824 | */ | |
1825 | else if (doing_fake_step && (tstate.tts_lwpid == fake_step_tid)) | |
c5aa993b | 1826 | { |
c906108c | 1827 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1828 | /* It's possible here to see either a SIGTRAP (due to |
1829 | * successful completion of a step) or a SYSCALL_ENTRY | |
1830 | * (due to a step completion with active hardware | |
1831 | * watchpoints). | |
1832 | */ | |
1833 | if (debug_on) | |
1834 | printf ("Ending fake step with tid %d, state %s\n", | |
1835 | tstate.tts_lwpid, | |
1836 | get_printable_name_of_ttrace_event (tstate.tts_event)); | |
1837 | #endif | |
1838 | ||
1839 | /* Remember this one, and throw away any previous | |
1840 | * candidate. | |
1841 | */ | |
1842 | candidate_tid = tstate.tts_lwpid; | |
1843 | candidate_tstate = tstate; | |
1844 | } | |
c906108c SS |
1845 | |
1846 | #ifdef FORGET_DELETED_BPTS | |
1847 | ||
1848 | /* We can't just do this, as if we do, and then wind | |
1849 | * up the loop with no unhandled events, we need to | |
1850 | * handle that case--the appropriate reaction is to | |
1851 | * just continue, but there's no easy way to do that. | |
1852 | * | |
1853 | * Better to put this in the ttrace_wait call--if, when | |
1854 | * we fake a wait, we update our events based on the | |
1855 | * breakpoint_here_pc call and find there are no more events, | |
1856 | * then we better continue and so on. | |
1857 | * | |
1858 | * Or we could put it in the next/continue fake. | |
1859 | * But it has to go in the buffering code, not in the | |
1860 | * real go/wait code. | |
1861 | */ | |
c5aa993b JM |
1862 | else if ((TTEVT_SIGNAL == tstate.tts_event) |
1863 | && (5 == tstate.tts_u.tts_signal.tts_signo) | |
1864 | && (0 != get_raw_pc (tstate.tts_lwpid)) | |
1865 | && !breakpoint_here_p (get_raw_pc (tstate.tts_lwpid))) | |
1866 | { | |
1867 | /* | |
1868 | * If the user deleted a breakpoint while this | |
1869 | * breakpoint-hit event was buffered, we can forget | |
1870 | * it now. | |
1871 | */ | |
c906108c | 1872 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1873 | if (debug_on) |
1874 | printf ("Forgetting deleted bp hit for thread %d\n", | |
1875 | tstate.tts_lwpid); | |
1876 | #endif | |
c906108c | 1877 | |
c5aa993b JM |
1878 | set_handled (pid, tstate.tts_lwpid); |
1879 | } | |
c906108c SS |
1880 | #endif |
1881 | ||
1882 | /* Else, is this the first "unhandled" event? If so, | |
1883 | * we believe our client wants to see it (if we don't | |
1884 | * see a fake-step later on in the scan). | |
1885 | */ | |
c5aa993b JM |
1886 | else if (!was_handled (tstate.tts_lwpid) && candidate_tid == 0) |
1887 | { | |
1888 | candidate_tid = tstate.tts_lwpid; | |
1889 | candidate_tstate = tstate; | |
1890 | } | |
c906108c SS |
1891 | |
1892 | /* This is either an event that has already been "handled", | |
1893 | * and thus we believe is uninteresting to our client, or we | |
1894 | * already have a candidate event. Ignore it... | |
1895 | */ | |
1896 | } | |
1897 | ||
1898 | /* What do we report? | |
1899 | */ | |
c5aa993b JM |
1900 | if (doing_fake_step) |
1901 | { | |
1902 | if (candidate_tid == fake_step_tid) | |
1903 | { | |
1904 | /* Fake step. | |
1905 | */ | |
1906 | tstate = candidate_tstate; | |
1907 | } | |
1908 | else | |
1909 | { | |
1910 | warning ("Internal error: fake-step failed to complete."); | |
1911 | return 0; | |
1912 | } | |
1913 | } | |
1914 | else if (candidate_tid != 0) | |
1915 | { | |
c906108c SS |
1916 | /* Found a candidate unhandled event. |
1917 | */ | |
1918 | tstate = candidate_tstate; | |
c5aa993b JM |
1919 | } |
1920 | else if (tid != 0) | |
1921 | { | |
1922 | warning ("Internal error in call of ttrace_wait."); | |
c906108c | 1923 | return 0; |
c5aa993b JM |
1924 | } |
1925 | else | |
1926 | { | |
c906108c SS |
1927 | warning ("Internal error: no unhandled thread event to select"); |
1928 | return 0; | |
c5aa993b | 1929 | } |
c906108c SS |
1930 | |
1931 | copy_ttstate_t (tsp, &tstate); | |
1932 | return 1; | |
c5aa993b | 1933 | } /* End of select_stopped_thread_of_process */ |
c906108c SS |
1934 | |
1935 | #ifdef PARANOIA | |
1936 | /* Check our internal thread data against the real thing. | |
1937 | */ | |
1938 | static void | |
fba45db2 | 1939 | check_thread_consistency (pid_t real_pid) |
c906108c | 1940 | { |
c5aa993b JM |
1941 | int tid; /* really lwpid_t */ |
1942 | ttstate_t tstate; | |
1943 | thread_info *p; | |
c906108c | 1944 | |
c5aa993b JM |
1945 | /* Spin down the O/S list of threads, checking that they |
1946 | * match what we've got. | |
1947 | */ | |
1948 | for (tid = get_process_first_stopped_thread_id (real_pid, &tstate); | |
1949 | tid != 0; | |
1950 | tid = get_process_next_stopped_thread_id (real_pid, &tstate)) | |
1951 | { | |
c906108c | 1952 | |
c5aa993b | 1953 | p = find_thread_info (tid); |
c906108c | 1954 | |
c5aa993b JM |
1955 | if (NULL == p) |
1956 | { | |
1957 | warning ("No internal thread data for thread %d.", tid); | |
1958 | continue; | |
1959 | } | |
1960 | ||
1961 | if (!p->seen) | |
1962 | { | |
1963 | warning ("Inconsistent internal thread data for thread %d.", tid); | |
1964 | } | |
1965 | ||
1966 | if (p->terminated) | |
1967 | { | |
1968 | warning ("Thread %d is not terminated, internal error.", tid); | |
1969 | continue; | |
1970 | } | |
c906108c SS |
1971 | |
1972 | ||
1973 | #define TT_COMPARE( fld ) \ | |
1974 | tstate.fld != p->last_stop_state.fld | |
c5aa993b JM |
1975 | |
1976 | if (p->have_state) | |
1977 | { | |
1978 | if (TT_COMPARE (tts_pid) | |
1979 | || TT_COMPARE (tts_lwpid) | |
1980 | || TT_COMPARE (tts_user_tid) | |
1981 | || TT_COMPARE (tts_event) | |
1982 | || TT_COMPARE (tts_flags) | |
1983 | || TT_COMPARE (tts_scno) | |
1984 | || TT_COMPARE (tts_scnargs)) | |
1985 | { | |
1986 | warning ("Internal thread data for thread %d is wrong.", tid); | |
1987 | continue; | |
1988 | } | |
1989 | } | |
c906108c SS |
1990 | } |
1991 | } | |
c5aa993b | 1992 | #endif /* PARANOIA */ |
c906108c | 1993 | \f |
c5aa993b | 1994 | |
c906108c SS |
1995 | /* This function wraps calls to "call_real_ttrace_wait" so |
1996 | * that a actual wait is only done when all pending events | |
1997 | * have been reported. | |
1998 | * | |
1999 | * Note that typically it is called with a pid of "0", i.e. | |
2000 | * the "don't care" value. | |
2001 | * | |
2002 | * Return value is the status of the pseudo wait. | |
2003 | */ | |
2004 | static int | |
fba45db2 | 2005 | call_ttrace_wait (int pid, ttwopt_t option, ttstate_t *tsp, size_t tsp_size) |
c906108c SS |
2006 | { |
2007 | /* This holds the actual, for-real, true process ID. | |
2008 | */ | |
2009 | static int real_pid; | |
2010 | ||
2011 | /* As an argument to ttrace_wait, zero pid | |
2012 | * means "Any process", and zero tid means | |
2013 | * "Any thread of the specified process". | |
2014 | */ | |
c5aa993b JM |
2015 | int wait_pid = 0; |
2016 | lwpid_t wait_tid = 0; | |
2017 | lwpid_t real_tid; | |
c906108c | 2018 | |
c5aa993b | 2019 | int ttw_status = 0; /* To be returned */ |
c906108c | 2020 | |
c5aa993b | 2021 | thread_info *tinfo = NULL; |
c906108c | 2022 | |
c5aa993b JM |
2023 | if (pid != 0) |
2024 | { | |
c906108c SS |
2025 | /* Unexpected case. |
2026 | */ | |
2027 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2028 | if (debug_on) |
2029 | printf ("TW: Pid to wait on is %d\n", pid); | |
c906108c SS |
2030 | #endif |
2031 | ||
c5aa993b JM |
2032 | if (!any_thread_records ()) |
2033 | error ("No thread records for ttrace call w. specific pid"); | |
c906108c SS |
2034 | |
2035 | /* OK, now the task is to translate the incoming tid into | |
2036 | * a pid/tid pair. | |
2037 | */ | |
c5aa993b JM |
2038 | real_tid = map_from_gdb_tid (pid); |
2039 | real_pid = get_pid_for (real_tid); | |
c906108c | 2040 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2041 | if (debug_on) |
2042 | printf ("==TW: real pid %d, real tid %d\n", real_pid, real_tid); | |
c906108c | 2043 | #endif |
c5aa993b | 2044 | } |
c906108c SS |
2045 | |
2046 | ||
2047 | /* Sanity checks and set-up. | |
2048 | * Process State | |
2049 | * | |
2050 | * Stopped Running Fake-step (v)Fork | |
2051 | * \________________________________________ | |
2052 | * | | |
2053 | * No buffered events | error wait wait wait | |
2054 | * | | |
2055 | * Buffered events | debuffer error wait debuffer (?) | |
2056 | * | |
2057 | */ | |
c5aa993b JM |
2058 | if (more_events_left == 0) |
2059 | { | |
2060 | ||
2061 | if (process_state == RUNNING) | |
2062 | { | |
2063 | /* OK--normal call of ttrace_wait with no buffered events. | |
2064 | */ | |
2065 | ; | |
2066 | } | |
2067 | else if (process_state == FAKE_STEPPING) | |
2068 | { | |
2069 | /* Ok--call of ttrace_wait to support | |
2070 | * fake stepping with no buffered events. | |
2071 | * | |
2072 | * But we better be fake-stepping! | |
2073 | */ | |
2074 | if (!doing_fake_step) | |
2075 | { | |
2076 | warning ("Inconsistent thread state."); | |
2077 | } | |
2078 | } | |
2079 | else if ((process_state == FORKING) | |
2080 | || (process_state == VFORKING)) | |
2081 | { | |
2082 | /* Ok--there are two processes, so waiting | |
2083 | * for the second while the first is stopped | |
2084 | * is ok. Handled bits stay as they were. | |
2085 | */ | |
2086 | ; | |
2087 | } | |
2088 | else if (process_state == STOPPED) | |
2089 | { | |
2090 | warning ("Process not running at wait call."); | |
2091 | } | |
c906108c | 2092 | else |
c5aa993b JM |
2093 | /* No known state. |
2094 | */ | |
2095 | warning ("Inconsistent process state."); | |
2096 | } | |
2097 | ||
2098 | else | |
2099 | { | |
c906108c SS |
2100 | /* More events left |
2101 | */ | |
c5aa993b JM |
2102 | if (process_state == STOPPED) |
2103 | { | |
2104 | /* OK--buffered events being unbuffered. | |
2105 | */ | |
2106 | ; | |
2107 | } | |
2108 | else if (process_state == RUNNING) | |
2109 | { | |
2110 | /* An error--shouldn't have buffered events | |
2111 | * when running. | |
2112 | */ | |
2113 | warning ("Trying to continue with buffered events:"); | |
2114 | } | |
2115 | else if (process_state == FAKE_STEPPING) | |
2116 | { | |
2117 | /* | |
2118 | * Better be fake-stepping! | |
2119 | */ | |
2120 | if (!doing_fake_step) | |
2121 | { | |
2122 | warning ("Losing buffered thread events!\n"); | |
2123 | } | |
2124 | } | |
2125 | else if ((process_state == FORKING) | |
2126 | || (process_state == VFORKING)) | |
2127 | { | |
2128 | /* Ok--there are two processes, so waiting | |
2129 | * for the second while the first is stopped | |
2130 | * is ok. Handled bits stay as they were. | |
2131 | */ | |
2132 | ; | |
2133 | } | |
c906108c | 2134 | else |
c5aa993b JM |
2135 | warning ("Process in unknown state with buffered events."); |
2136 | } | |
c906108c SS |
2137 | |
2138 | /* Sometimes we have to wait for a particular thread | |
2139 | * (if we're stepping over a bpt). In that case, we | |
2140 | * _know_ it's going to complete the single-step we | |
2141 | * asked for (because we're only doing the step under | |
2142 | * certain very well-understood circumstances), so it | |
2143 | * can't block. | |
2144 | */ | |
c5aa993b JM |
2145 | if (doing_fake_step) |
2146 | { | |
c906108c | 2147 | wait_tid = fake_step_tid; |
c5aa993b | 2148 | wait_pid = get_pid_for (fake_step_tid); |
c906108c SS |
2149 | |
2150 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
2151 | if (debug_on) |
2152 | printf ("Doing a wait after a fake-step for %d, pid %d\n", | |
2153 | wait_tid, wait_pid); | |
c906108c | 2154 | #endif |
c5aa993b | 2155 | } |
c906108c | 2156 | |
c5aa993b JM |
2157 | if (more_events_left == 0 /* No buffered events, need real ones. */ |
2158 | || process_state != STOPPED) | |
2159 | { | |
c906108c SS |
2160 | /* If there are no buffered events, and so we need |
2161 | * real ones, or if we are FORKING, VFORKING, | |
2162 | * FAKE_STEPPING or RUNNING, and thus have to do | |
2163 | * a real wait, then do a real wait. | |
2164 | */ | |
2165 | ||
2166 | #ifdef WAIT_BUFFER_DEBUG | |
2167 | /* Normal case... */ | |
c5aa993b JM |
2168 | if (debug_on) |
2169 | printf ("TW: do it for real; pid %d, tid %d\n", wait_pid, wait_tid); | |
c906108c SS |
2170 | #endif |
2171 | ||
2172 | /* The actual wait call. | |
2173 | */ | |
c5aa993b | 2174 | ttw_status = call_real_ttrace_wait (wait_pid, wait_tid, option, tsp, tsp_size); |
c906108c SS |
2175 | |
2176 | /* Note that the routines we'll call will be using "call_real_ttrace", | |
2177 | * not "call_ttrace", and thus need the real pid rather than the pseudo-tid | |
2178 | * the rest of the world uses (which is actually the tid). | |
2179 | */ | |
2180 | real_pid = tsp->tts_pid; | |
2181 | ||
2182 | /* For most events: Stop the world! | |
c5aa993b | 2183 | |
c906108c SS |
2184 | * It's sometimes not safe to stop all threads of a process. |
2185 | * Sometimes it's not even safe to ask for the thread state | |
2186 | * of a process! | |
2187 | */ | |
2188 | if (can_touch_threads_of_process (real_pid, tsp->tts_event)) | |
c5aa993b JM |
2189 | { |
2190 | /* If we're really only stepping a single thread, then don't | |
2191 | * try to stop all the others -- we only do this single-stepping | |
2192 | * business when all others were already stopped...and the stop | |
2193 | * would mess up other threads' events. | |
2194 | * | |
2195 | * Similiarly, if there are other threads with events, | |
2196 | * don't do the stop. | |
2197 | */ | |
2198 | if (!doing_fake_step) | |
2199 | { | |
2200 | if (more_events_left > 0) | |
2201 | warning ("Internal error in stopping process"); | |
2202 | ||
2203 | stop_all_threads_of_process (real_pid); | |
2204 | ||
2205 | /* At this point, we could scan and update_thread_list(), | |
2206 | * and only use the local list for the rest of the | |
2207 | * module! We'd get rid of the scans in the various | |
2208 | * continue routines (adding one in attach). It'd | |
2209 | * be great--UPGRADE ME! | |
2210 | */ | |
2211 | } | |
2212 | } | |
2213 | ||
c906108c | 2214 | #ifdef PARANOIA |
c5aa993b JM |
2215 | else if (debug_on) |
2216 | { | |
2217 | if (more_events_left > 0) | |
2218 | printf ("== Can't stop process; more events!\n"); | |
2219 | else | |
2220 | printf ("== Can't stop process!\n"); | |
2221 | } | |
c906108c SS |
2222 | #endif |
2223 | ||
c5aa993b | 2224 | process_state = STOPPED; |
c906108c SS |
2225 | |
2226 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
2227 | if (debug_on) |
2228 | printf ("Process set to STOPPED\n"); | |
c906108c | 2229 | #endif |
c5aa993b JM |
2230 | } |
2231 | ||
2232 | else | |
2233 | { | |
c906108c SS |
2234 | /* Fake a call to ttrace_wait. The process must be |
2235 | * STOPPED, as we aren't going to do any wait. | |
2236 | */ | |
2237 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
2238 | if (debug_on) |
2239 | printf ("TW: fake it\n"); | |
c906108c SS |
2240 | #endif |
2241 | ||
c5aa993b JM |
2242 | if (process_state != STOPPED) |
2243 | { | |
2244 | warning ("Process not stopped at wait call, in state '%s'.\n", | |
2245 | get_printable_name_of_process_state (process_state)); | |
2246 | } | |
2247 | ||
2248 | if (doing_fake_step) | |
2249 | error ("Internal error in stepping over breakpoint"); | |
c906108c | 2250 | |
c5aa993b JM |
2251 | ttw_status = 0; /* Faking it is always successful! */ |
2252 | } /* End of fake or not? if */ | |
c906108c SS |
2253 | |
2254 | /* Pick an event to pass to our caller. Be paranoid. | |
2255 | */ | |
c5aa993b JM |
2256 | if (!select_stopped_thread_of_process (real_pid, tsp)) |
2257 | warning ("Can't find event, using previous event."); | |
2258 | ||
2259 | else if (tsp->tts_event == TTEVT_NONE) | |
2260 | warning ("Internal error: no thread has a real event."); | |
c906108c | 2261 | |
c5aa993b JM |
2262 | else if (doing_fake_step) |
2263 | { | |
2264 | if (fake_step_tid != tsp->tts_lwpid) | |
2265 | warning ("Internal error in stepping over breakpoint."); | |
c906108c | 2266 | |
c906108c SS |
2267 | /* This wait clears the (current) fake-step if there was one. |
2268 | */ | |
2269 | doing_fake_step = 0; | |
c5aa993b JM |
2270 | fake_step_tid = 0; |
2271 | } | |
c906108c SS |
2272 | |
2273 | /* We now have a correct tsp and ttw_status for the thread | |
2274 | * which we want to report. So it's "handled"! This call | |
2275 | * will add it to our list if it's not there already. | |
2276 | */ | |
c5aa993b | 2277 | set_handled (real_pid, tsp->tts_lwpid); |
c906108c SS |
2278 | |
2279 | /* Save a copy of the ttrace state of this thread, in our local | |
2280 | thread descriptor. | |
2281 | ||
2282 | This caches the state. The implementation of queries like | |
2283 | target_has_execd can then use this cached state, rather than | |
2284 | be forced to make an explicit ttrace call to get it. | |
2285 | ||
2286 | (Guard against the condition that this is the first time we've | |
2287 | waited on, i.e., seen this thread, and so haven't yet entered | |
2288 | it into our list of threads.) | |
2289 | */ | |
2290 | tinfo = find_thread_info (tsp->tts_lwpid); | |
c5aa993b JM |
2291 | if (tinfo != NULL) |
2292 | { | |
2293 | copy_ttstate_t (&tinfo->last_stop_state, tsp); | |
2294 | tinfo->have_state = 1; | |
2295 | } | |
2296 | ||
c906108c | 2297 | return ttw_status; |
c5aa993b | 2298 | } /* call_ttrace_wait */ |
c906108c SS |
2299 | |
2300 | #if defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL) | |
2301 | int | |
fba45db2 | 2302 | child_reported_exec_events_per_exec_call (void) |
c906108c | 2303 | { |
c5aa993b | 2304 | return 1; /* ttrace reports the event once per call. */ |
c906108c SS |
2305 | } |
2306 | #endif | |
c5aa993b | 2307 | \f |
c906108c SS |
2308 | |
2309 | ||
c906108c SS |
2310 | /* Our implementation of hardware watchpoints involves making memory |
2311 | pages write-protected. We must remember a page's original permissions, | |
2312 | and we must also know when it is appropriate to restore a page's | |
2313 | permissions to its original state. | |
2314 | ||
2315 | We use a "dictionary" of hardware-watched pages to do this. Each | |
2316 | hardware-watched page is recorded in the dictionary. Each page's | |
2317 | dictionary entry contains the original permissions and a reference | |
2318 | count. Pages are hashed into the dictionary by their start address. | |
2319 | ||
2320 | When hardware watchpoint is set on page X for the first time, page X | |
2321 | is added to the dictionary with a reference count of 1. If other | |
2322 | hardware watchpoints are subsequently set on page X, its reference | |
2323 | count is incremented. When hardware watchpoints are removed from | |
2324 | page X, its reference count is decremented. If a page's reference | |
2325 | count drops to 0, it's permissions are restored and the page's entry | |
2326 | is thrown out of the dictionary. | |
c5aa993b JM |
2327 | */ |
2328 | typedef struct memory_page | |
2329 | { | |
2330 | CORE_ADDR page_start; | |
2331 | int reference_count; | |
2332 | int original_permissions; | |
2333 | struct memory_page *next; | |
2334 | struct memory_page *previous; | |
2335 | } | |
2336 | memory_page_t; | |
c906108c SS |
2337 | |
2338 | #define MEMORY_PAGE_DICTIONARY_BUCKET_COUNT 128 | |
2339 | ||
c5aa993b JM |
2340 | static struct |
2341 | { | |
2342 | LONGEST page_count; | |
2343 | int page_size; | |
2344 | int page_protections_allowed; | |
2345 | /* These are just the heads of chains of actual page descriptors. */ | |
2346 | memory_page_t buckets[MEMORY_PAGE_DICTIONARY_BUCKET_COUNT]; | |
2347 | } | |
2348 | memory_page_dictionary; | |
c906108c SS |
2349 | |
2350 | ||
2351 | static void | |
fba45db2 | 2352 | require_memory_page_dictionary (void) |
c906108c | 2353 | { |
c5aa993b | 2354 | int i; |
c906108c SS |
2355 | |
2356 | /* Is the memory page dictionary ready for use? If so, we're done. */ | |
2357 | if (memory_page_dictionary.page_count >= (LONGEST) 0) | |
2358 | return; | |
2359 | ||
2360 | /* Else, initialize it. */ | |
2361 | memory_page_dictionary.page_count = (LONGEST) 0; | |
2362 | ||
c5aa993b | 2363 | for (i = 0; i < MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; i++) |
c906108c SS |
2364 | { |
2365 | memory_page_dictionary.buckets[i].page_start = (CORE_ADDR) 0; | |
2366 | memory_page_dictionary.buckets[i].reference_count = 0; | |
2367 | memory_page_dictionary.buckets[i].next = NULL; | |
2368 | memory_page_dictionary.buckets[i].previous = NULL; | |
2369 | } | |
2370 | } | |
2371 | ||
2372 | ||
2373 | static void | |
fba45db2 | 2374 | retire_memory_page_dictionary (void) |
c906108c | 2375 | { |
c5aa993b | 2376 | memory_page_dictionary.page_count = (LONGEST) - 1; |
c906108c SS |
2377 | } |
2378 | ||
2379 | ||
2380 | /* Write-protect the memory page that starts at this address. | |
2381 | ||
2382 | Returns the original permissions of the page. | |
2383 | */ | |
2384 | static int | |
fba45db2 | 2385 | write_protect_page (int pid, CORE_ADDR page_start) |
c906108c | 2386 | { |
c5aa993b JM |
2387 | int tt_status; |
2388 | int original_permissions; | |
2389 | int new_permissions; | |
c906108c SS |
2390 | |
2391 | tt_status = call_ttrace (TT_PROC_GET_MPROTECT, | |
c5aa993b JM |
2392 | pid, |
2393 | (TTRACE_ARG_TYPE) page_start, | |
2394 | TT_NIL, | |
2395 | (TTRACE_ARG_TYPE) & original_permissions); | |
c906108c SS |
2396 | if (errno || (tt_status < 0)) |
2397 | { | |
c5aa993b | 2398 | return 0; /* What else can we do? */ |
c906108c SS |
2399 | } |
2400 | ||
2401 | /* We'll also write-protect the page now, if that's allowed. */ | |
2402 | if (memory_page_dictionary.page_protections_allowed) | |
2403 | { | |
2404 | new_permissions = original_permissions & ~PROT_WRITE; | |
2405 | tt_status = call_ttrace (TT_PROC_SET_MPROTECT, | |
c5aa993b JM |
2406 | pid, |
2407 | (TTRACE_ARG_TYPE) page_start, | |
2408 | (TTRACE_ARG_TYPE) memory_page_dictionary.page_size, | |
2409 | (TTRACE_ARG_TYPE) new_permissions); | |
c906108c | 2410 | if (errno || (tt_status < 0)) |
c5aa993b JM |
2411 | { |
2412 | return 0; /* What else can we do? */ | |
2413 | } | |
c906108c SS |
2414 | } |
2415 | ||
2416 | return original_permissions; | |
2417 | } | |
2418 | ||
2419 | ||
2420 | /* Unwrite-protect the memory page that starts at this address, restoring | |
2421 | (what we must assume are) its original permissions. | |
c5aa993b | 2422 | */ |
c906108c | 2423 | static void |
fba45db2 | 2424 | unwrite_protect_page (int pid, CORE_ADDR page_start, int original_permissions) |
c906108c | 2425 | { |
c5aa993b | 2426 | int tt_status; |
c906108c SS |
2427 | |
2428 | tt_status = call_ttrace (TT_PROC_SET_MPROTECT, | |
c5aa993b JM |
2429 | pid, |
2430 | (TTRACE_ARG_TYPE) page_start, | |
2431 | (TTRACE_ARG_TYPE) memory_page_dictionary.page_size, | |
2432 | (TTRACE_ARG_TYPE) original_permissions); | |
c906108c SS |
2433 | if (errno || (tt_status < 0)) |
2434 | { | |
c5aa993b | 2435 | return; /* What else can we do? */ |
c906108c SS |
2436 | } |
2437 | } | |
2438 | ||
2439 | ||
2440 | /* Memory page-protections are used to implement "hardware" watchpoints | |
2441 | on HP-UX. | |
2442 | ||
2443 | For every memory page that is currently being watched (i.e., that | |
2444 | presently should be write-protected), write-protect it. | |
c5aa993b | 2445 | */ |
c906108c | 2446 | void |
fba45db2 | 2447 | hppa_enable_page_protection_events (int pid) |
c906108c | 2448 | { |
c5aa993b | 2449 | int bucket; |
c906108c SS |
2450 | |
2451 | memory_page_dictionary.page_protections_allowed = 1; | |
2452 | ||
c5aa993b | 2453 | for (bucket = 0; bucket < MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; bucket++) |
c906108c | 2454 | { |
c5aa993b | 2455 | memory_page_t *page; |
c906108c SS |
2456 | |
2457 | page = memory_page_dictionary.buckets[bucket].next; | |
2458 | while (page != NULL) | |
c5aa993b JM |
2459 | { |
2460 | page->original_permissions = write_protect_page (pid, page->page_start); | |
2461 | page = page->next; | |
2462 | } | |
c906108c SS |
2463 | } |
2464 | } | |
2465 | ||
2466 | ||
2467 | /* Memory page-protections are used to implement "hardware" watchpoints | |
2468 | on HP-UX. | |
2469 | ||
2470 | For every memory page that is currently being watched (i.e., that | |
2471 | presently is or should be write-protected), un-write-protect it. | |
c5aa993b | 2472 | */ |
c906108c | 2473 | void |
fba45db2 | 2474 | hppa_disable_page_protection_events (int pid) |
c906108c | 2475 | { |
c5aa993b | 2476 | int bucket; |
c906108c | 2477 | |
c5aa993b | 2478 | for (bucket = 0; bucket < MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; bucket++) |
c906108c | 2479 | { |
c5aa993b | 2480 | memory_page_t *page; |
c906108c SS |
2481 | |
2482 | page = memory_page_dictionary.buckets[bucket].next; | |
2483 | while (page != NULL) | |
c5aa993b JM |
2484 | { |
2485 | unwrite_protect_page (pid, page->page_start, page->original_permissions); | |
2486 | page = page->next; | |
2487 | } | |
c906108c SS |
2488 | } |
2489 | ||
2490 | memory_page_dictionary.page_protections_allowed = 0; | |
2491 | } | |
2492 | ||
2493 | /* Count the number of outstanding events. At this | |
2494 | * point, we have selected one thread and its event | |
2495 | * as the one to be "reported" upwards to core gdb. | |
2496 | * That thread is already marked as "handled". | |
2497 | * | |
2498 | * Note: we could just scan our own thread list. FIXME! | |
2499 | */ | |
2500 | static int | |
fba45db2 | 2501 | count_unhandled_events (int real_pid, lwpid_t real_tid) |
c906108c | 2502 | { |
c5aa993b JM |
2503 | ttstate_t tstate; |
2504 | lwpid_t ttid; | |
2505 | int events_left; | |
2506 | ||
c906108c SS |
2507 | /* Ok, find out how many threads have real events to report. |
2508 | */ | |
2509 | events_left = 0; | |
c5aa993b | 2510 | ttid = get_process_first_stopped_thread_id (real_pid, &tstate); |
c906108c SS |
2511 | |
2512 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2513 | if (debug_on) |
2514 | { | |
2515 | if (ttid == 0) | |
2516 | printf ("Process %d has no threads\n", real_pid); | |
c906108c | 2517 | else |
c5aa993b JM |
2518 | printf ("Process %d has these threads:\n", real_pid); |
2519 | } | |
c906108c SS |
2520 | #endif |
2521 | ||
c5aa993b JM |
2522 | while (ttid > 0) |
2523 | { | |
2524 | if (tstate.tts_event != TTEVT_NONE | |
2525 | && !was_handled (ttid)) | |
2526 | { | |
2527 | /* TTEVT_NONE implies we just stopped it ourselves | |
2528 | * because we're the stop-the-world guys, so it's | |
2529 | * not an event from our point of view. | |
2530 | * | |
2531 | * If "was_handled" is true, this is an event we | |
2532 | * already handled, so don't count it. | |
2533 | * | |
2534 | * Note that we don't count the thread with the | |
2535 | * currently-reported event, as it's already marked | |
2536 | * as handled. | |
2537 | */ | |
2538 | events_left++; | |
2539 | } | |
2540 | ||
c906108c | 2541 | #if defined( THREAD_DEBUG ) || defined( WAIT_BUFFER_DEBUG ) |
c5aa993b JM |
2542 | if (debug_on) |
2543 | { | |
2544 | if (ttid == real_tid) | |
2545 | printf ("*"); /* Thread we're reporting */ | |
2546 | else | |
2547 | printf (" "); | |
2548 | ||
2549 | if (tstate.tts_event != TTEVT_NONE) | |
2550 | printf ("+"); /* Thread with a real event */ | |
2551 | else | |
2552 | printf (" "); | |
2553 | ||
2554 | if (was_handled (ttid)) | |
2555 | printf ("h"); /* Thread has been handled */ | |
2556 | else | |
2557 | printf (" "); | |
2558 | ||
2559 | printf (" %d, with event %s", ttid, | |
2560 | get_printable_name_of_ttrace_event (tstate.tts_event)); | |
2561 | ||
2562 | if (tstate.tts_event == TTEVT_SIGNAL | |
2563 | && 5 == tstate.tts_u.tts_signal.tts_signo) | |
2564 | { | |
2565 | CORE_ADDR pc_val; | |
c906108c | 2566 | |
c5aa993b JM |
2567 | pc_val = get_raw_pc (ttid); |
2568 | ||
2569 | if (pc_val > 0) | |
2570 | printf (" breakpoint at 0x%x\n", pc_val); | |
2571 | else | |
2572 | printf (" bpt, can't fetch pc.\n"); | |
2573 | } | |
2574 | else | |
2575 | printf ("\n"); | |
2576 | } | |
c906108c SS |
2577 | #endif |
2578 | ||
2579 | ttid = get_process_next_stopped_thread_id (real_pid, &tstate); | |
c5aa993b | 2580 | } |
c906108c SS |
2581 | |
2582 | #if defined( THREAD_DEBUG ) || defined( WAIT_BUFFER_DEBUG ) | |
c5aa993b JM |
2583 | if (debug_on) |
2584 | if (events_left > 0) | |
2585 | printf ("There are thus %d pending events\n", events_left); | |
c906108c SS |
2586 | #endif |
2587 | ||
2588 | return events_left; | |
2589 | } | |
2590 | ||
2591 | /* This function is provided as a sop to clients that are calling | |
2592 | * ptrace_wait to wait for a process to stop. (see the | |
2593 | * implementation of child_wait.) Return value is the pid for | |
2594 | * the event that ended the wait. | |
2595 | * | |
2596 | * Note: used by core gdb and so uses the pseudo-pid (really tid). | |
2597 | */ | |
2598 | int | |
fba45db2 | 2599 | ptrace_wait (int pid, int *status) |
c906108c | 2600 | { |
c5aa993b JM |
2601 | ttstate_t tsp; |
2602 | int ttwait_return; | |
2603 | int real_pid; | |
2604 | ttstate_t state; | |
2605 | lwpid_t real_tid; | |
2606 | int return_pid; | |
c906108c SS |
2607 | |
2608 | /* The ptrace implementation of this also ignores pid. | |
2609 | */ | |
2610 | *status = 0; | |
2611 | ||
c5aa993b | 2612 | ttwait_return = call_ttrace_wait (0, TTRACE_WAITOK, &tsp, sizeof (tsp)); |
c906108c SS |
2613 | if (ttwait_return < 0) |
2614 | { | |
2615 | /* ??rehrauer: It appears that if our inferior exits and we | |
2616 | haven't asked for exit events, that we're not getting any | |
2617 | indication save a negative return from ttrace_wait and an | |
2618 | errno set to ESRCH? | |
c5aa993b | 2619 | */ |
c906108c | 2620 | if (errno == ESRCH) |
c5aa993b JM |
2621 | { |
2622 | *status = 0; /* WIFEXITED */ | |
2623 | return inferior_pid; | |
2624 | } | |
c906108c | 2625 | |
c5aa993b JM |
2626 | warning ("Call of ttrace_wait returned with errno %d.", |
2627 | errno); | |
c906108c SS |
2628 | *status = ttwait_return; |
2629 | return inferior_pid; | |
2630 | } | |
2631 | ||
2632 | real_pid = tsp.tts_pid; | |
2633 | real_tid = tsp.tts_lwpid; | |
2634 | ||
2635 | /* One complication is that the "tts_event" structure has | |
2636 | * a set of flags, and more than one can be set. So we | |
2637 | * either have to force an order (as we do here), or handle | |
2638 | * more than one flag at a time. | |
2639 | */ | |
c5aa993b JM |
2640 | if (tsp.tts_event & TTEVT_LWP_CREATE) |
2641 | { | |
2642 | ||
2643 | /* Unlike what you might expect, this event is reported in | |
2644 | * the _creating_ thread, and the _created_ thread (whose tid | |
2645 | * we have) is still running. So we have to stop it. This | |
2646 | * has already been done in "call_ttrace_wait", but should we | |
2647 | * ever abandon the "stop-the-world" model, here's the command | |
2648 | * to use: | |
2649 | * | |
2650 | * call_ttrace( TT_LWP_STOP, real_tid, TT_NIL, TT_NIL, TT_NIL ); | |
2651 | * | |
2652 | * Note that this would depend on being called _after_ "add_tthread" | |
2653 | * below for the tid-to-pid translation to be done in "call_ttrace". | |
2654 | */ | |
c906108c SS |
2655 | |
2656 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2657 | if (debug_on) |
2658 | printf ("New thread: pid %d, tid %d, creator tid %d\n", | |
2659 | real_pid, tsp.tts_u.tts_thread.tts_target_lwpid, | |
2660 | real_tid); | |
c906108c SS |
2661 | #endif |
2662 | ||
c5aa993b JM |
2663 | /* Now we have to return the tid of the created thread, not |
2664 | * the creating thread, or "wait_for_inferior" won't know we | |
2665 | * have a new "process" (thread). Plus we should record it | |
2666 | * right, too. | |
2667 | */ | |
c906108c SS |
2668 | real_tid = tsp.tts_u.tts_thread.tts_target_lwpid; |
2669 | ||
c5aa993b JM |
2670 | add_tthread (real_pid, real_tid); |
2671 | } | |
c906108c | 2672 | |
c5aa993b JM |
2673 | else if ((tsp.tts_event & TTEVT_LWP_TERMINATE) |
2674 | || (tsp.tts_event & TTEVT_LWP_EXIT)) | |
2675 | { | |
c906108c SS |
2676 | |
2677 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2678 | if (debug_on) |
2679 | printf ("Thread dies: %d\n", real_tid); | |
c906108c SS |
2680 | #endif |
2681 | ||
c5aa993b JM |
2682 | del_tthread (real_tid); |
2683 | } | |
c906108c | 2684 | |
c5aa993b JM |
2685 | else if (tsp.tts_event & TTEVT_EXEC) |
2686 | { | |
c906108c | 2687 | |
c5aa993b JM |
2688 | #ifdef THREAD_DEBUG |
2689 | if (debug_on) | |
2690 | printf ("Pid %d has zero'th thread %d; inferior pid is %d\n", | |
2691 | real_pid, real_tid, inferior_pid); | |
c906108c SS |
2692 | #endif |
2693 | ||
c5aa993b JM |
2694 | add_tthread (real_pid, real_tid); |
2695 | } | |
c906108c SS |
2696 | |
2697 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2698 | else if (debug_on) |
2699 | { | |
2700 | printf ("Process-level event %s, using tid %d\n", | |
2701 | get_printable_name_of_ttrace_event (tsp.tts_event), | |
2702 | real_tid); | |
2703 | ||
2704 | /* OK to do this, as "add_tthread" won't add | |
2705 | * duplicate entries. Also OK not to do it, | |
2706 | * as this event isn't one which can change the | |
2707 | * thread state. | |
2708 | */ | |
2709 | add_tthread (real_pid, real_tid); | |
2710 | } | |
c906108c SS |
2711 | #endif |
2712 | ||
2713 | ||
2714 | /* How many events are left to report later? | |
2715 | * In a non-stop-the-world model, this isn't needed. | |
2716 | * | |
2717 | * Note that it's not always safe to query the thread state of a process, | |
2718 | * which is what count_unhandled_events does. (If unsafe, we're left with | |
2719 | * no other resort than to assume that no more events remain...) | |
2720 | */ | |
2721 | if (can_touch_threads_of_process (real_pid, tsp.tts_event)) | |
c5aa993b JM |
2722 | more_events_left = count_unhandled_events (real_pid, real_tid); |
2723 | ||
2724 | else | |
2725 | { | |
2726 | if (more_events_left > 0) | |
2727 | warning ("Vfork or fork causing loss of %d buffered events.", | |
2728 | more_events_left); | |
2729 | ||
c906108c | 2730 | more_events_left = 0; |
c5aa993b | 2731 | } |
c906108c SS |
2732 | |
2733 | /* Attempt to translate the ttrace_wait-returned status into the | |
2734 | ptrace equivalent. | |
2735 | ||
2736 | ??rehrauer: This is somewhat fragile. We really ought to rewrite | |
2737 | clients that expect to pick apart a ptrace wait status, to use | |
2738 | something a little more abstract. | |
c5aa993b JM |
2739 | */ |
2740 | if ((tsp.tts_event & TTEVT_EXEC) | |
c906108c SS |
2741 | || (tsp.tts_event & TTEVT_FORK) |
2742 | || (tsp.tts_event & TTEVT_VFORK)) | |
2743 | { | |
2744 | /* Forks come in pairs (parent and child), so core gdb | |
2745 | * will do two waits. Be ready to notice this. | |
2746 | */ | |
2747 | if (tsp.tts_event & TTEVT_FORK) | |
c5aa993b JM |
2748 | { |
2749 | process_state = FORKING; | |
2750 | ||
c906108c | 2751 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
2752 | if (debug_on) |
2753 | printf ("Process set to FORKING\n"); | |
c906108c | 2754 | #endif |
c5aa993b | 2755 | } |
c906108c | 2756 | else if (tsp.tts_event & TTEVT_VFORK) |
c5aa993b JM |
2757 | { |
2758 | process_state = VFORKING; | |
2759 | ||
c906108c | 2760 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
2761 | if (debug_on) |
2762 | printf ("Process set to VFORKING\n"); | |
c906108c | 2763 | #endif |
c5aa993b | 2764 | } |
c906108c SS |
2765 | |
2766 | /* Make an exec or fork look like a breakpoint. Definitely a hack, | |
2767 | but I don't think non HP-UX-specific clients really carefully | |
2768 | inspect the first events they get after inferior startup, so | |
2769 | it probably almost doesn't matter what we claim this is. | |
c5aa993b | 2770 | */ |
c906108c SS |
2771 | |
2772 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2773 | if (debug_on) |
2774 | printf ("..a process 'event'\n"); | |
c906108c SS |
2775 | #endif |
2776 | ||
2777 | /* Also make fork and exec events look like bpts, so they can be caught. | |
c5aa993b | 2778 | */ |
c906108c SS |
2779 | *status = 0177 | (_SIGTRAP << 8); |
2780 | } | |
2781 | ||
2782 | /* Special-cases: We ask for syscall entry and exit events to implement | |
2783 | "fast" (aka "hardware") watchpoints. | |
2784 | ||
2785 | When we get a syscall entry, we want to disable page-protections, | |
2786 | and resume the inferior; this isn't an event we wish for | |
2787 | wait_for_inferior to see. Note that we must resume ONLY the | |
2788 | thread that reported the syscall entry; we don't want to allow | |
2789 | other threads to run with the page protections off, as they might | |
2790 | then be able to write to watch memory without it being caught. | |
2791 | ||
2792 | When we get a syscall exit, we want to reenable page-protections, | |
2793 | but we don't want to resume the inferior; this is an event we wish | |
2794 | wait_for_inferior to see. Make it look like the signal we normally | |
2795 | get for a single-step completion. This should cause wait_for_inferior | |
2796 | to evaluate whether any watchpoint triggered. | |
2797 | ||
2798 | Or rather, that's what we'd LIKE to do for syscall exit; we can't, | |
2799 | due to some HP-UX "features". Some syscalls have problems with | |
2800 | write-protections on some pages, and some syscalls seem to have | |
2801 | pending writes to those pages at the time we're getting the return | |
2802 | event. So, we'll single-step the inferior to get out of the syscall, | |
2803 | and then reenable protections. | |
2804 | ||
2805 | Note that we're intentionally allowing the syscall exit case to | |
2806 | fall through into the succeeding cases, as sometimes we single- | |
2807 | step out of one syscall only to immediately enter another... | |
2808 | */ | |
2809 | else if ((tsp.tts_event & TTEVT_SYSCALL_ENTRY) | |
c5aa993b | 2810 | || (tsp.tts_event & TTEVT_SYSCALL_RETURN)) |
c906108c SS |
2811 | { |
2812 | /* Make a syscall event look like a breakpoint. Same comments | |
2813 | as for exec & fork events. | |
c5aa993b | 2814 | */ |
c906108c | 2815 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2816 | if (debug_on) |
2817 | printf ("..a syscall 'event'\n"); | |
c906108c SS |
2818 | #endif |
2819 | ||
2820 | /* Also make syscall events look like bpts, so they can be caught. | |
c5aa993b | 2821 | */ |
c906108c SS |
2822 | *status = 0177 | (_SIGTRAP << 8); |
2823 | } | |
2824 | ||
2825 | else if ((tsp.tts_event & TTEVT_LWP_CREATE) | |
c5aa993b JM |
2826 | || (tsp.tts_event & TTEVT_LWP_TERMINATE) |
2827 | || (tsp.tts_event & TTEVT_LWP_EXIT)) | |
c906108c SS |
2828 | { |
2829 | /* Make a thread event look like a breakpoint. Same comments | |
2830 | * as for exec & fork events. | |
2831 | */ | |
2832 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2833 | if (debug_on) |
2834 | printf ("..a thread 'event'\n"); | |
c906108c SS |
2835 | #endif |
2836 | ||
2837 | /* Also make thread events look like bpts, so they can be caught. | |
c5aa993b | 2838 | */ |
c906108c SS |
2839 | *status = 0177 | (_SIGTRAP << 8); |
2840 | } | |
c5aa993b | 2841 | |
c906108c | 2842 | else if ((tsp.tts_event & TTEVT_EXIT)) |
c5aa993b JM |
2843 | { /* WIFEXITED */ |
2844 | ||
c906108c | 2845 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2846 | if (debug_on) |
2847 | printf ("..an exit\n"); | |
c906108c SS |
2848 | #endif |
2849 | ||
2850 | /* Prevent rest of gdb from thinking this is | |
2851 | * a new thread if for some reason it's never | |
2852 | * seen the main thread before. | |
2853 | */ | |
c5aa993b JM |
2854 | inferior_pid = map_to_gdb_tid (real_tid); /* HACK, FIX */ |
2855 | ||
c906108c SS |
2856 | *status = 0 | (tsp.tts_u.tts_exit.tts_exitcode); |
2857 | } | |
c5aa993b | 2858 | |
c906108c | 2859 | else if (tsp.tts_event & TTEVT_SIGNAL) |
c5aa993b | 2860 | { /* WIFSTOPPED */ |
c906108c | 2861 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2862 | if (debug_on) |
2863 | printf ("..a signal, %d\n", tsp.tts_u.tts_signal.tts_signo); | |
c906108c SS |
2864 | #endif |
2865 | ||
2866 | *status = 0177 | (tsp.tts_u.tts_signal.tts_signo << 8); | |
2867 | } | |
2868 | ||
2869 | else | |
c5aa993b | 2870 | { /* !WIFSTOPPED */ |
c906108c SS |
2871 | |
2872 | /* This means the process or thread terminated. But we should've | |
2873 | caught an explicit exit/termination above. So warn (this is | |
2874 | really an internal error) and claim the process or thread | |
2875 | terminated with a SIGTRAP. | |
2876 | */ | |
2877 | ||
2878 | warning ("process_wait: unknown process state"); | |
2879 | ||
2880 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2881 | if (debug_on) |
2882 | printf ("Process-level event %s, using tid %d\n", | |
2883 | get_printable_name_of_ttrace_event (tsp.tts_event), | |
2884 | real_tid); | |
c906108c SS |
2885 | #endif |
2886 | ||
2887 | *status = _SIGTRAP; | |
2888 | } | |
2889 | ||
2890 | target_post_wait (tsp.tts_pid, *status); | |
2891 | ||
2892 | ||
2893 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2894 | if (debug_on) |
2895 | printf ("Done waiting, pid is %d, tid %d\n", real_pid, real_tid); | |
c906108c SS |
2896 | #endif |
2897 | ||
2898 | /* All code external to this module uses the tid, but calls | |
2899 | * it "pid". There's some tweaking so that the outside sees | |
2900 | * the first thread as having the same number as the starting | |
2901 | * pid. | |
2902 | */ | |
c5aa993b | 2903 | return_pid = map_to_gdb_tid (real_tid); |
c906108c SS |
2904 | |
2905 | /* Remember this for later use in "hppa_prepare_to_proceed". | |
2906 | */ | |
c5aa993b | 2907 | old_gdb_pid = inferior_pid; |
c906108c SS |
2908 | reported_pid = return_pid; |
2909 | reported_bpt = ((tsp.tts_event & TTEVT_SIGNAL) && (5 == tsp.tts_u.tts_signal.tts_signo)); | |
2910 | ||
c5aa993b JM |
2911 | if (real_tid == 0 || return_pid == 0) |
2912 | { | |
2913 | warning ("Internal error: process-wait failed."); | |
2914 | } | |
2915 | ||
c906108c SS |
2916 | return return_pid; |
2917 | } | |
c906108c | 2918 | \f |
c5aa993b | 2919 | |
c906108c SS |
2920 | /* This function causes the caller's process to be traced by its |
2921 | parent. This is intended to be called after GDB forks itself, | |
2922 | and before the child execs the target. Despite the name, it | |
2923 | is called by the child. | |
2924 | ||
2925 | Note that HP-UX ttrace is rather funky in how this is done. | |
2926 | If the parent wants to get the initial exec event of a child, | |
2927 | it must set the ttrace event mask of the child to include execs. | |
2928 | (The child cannot do this itself.) This must be done after the | |
2929 | child is forked, but before it execs. | |
2930 | ||
2931 | To coordinate the parent and child, we implement a semaphore using | |
2932 | pipes. After SETTRC'ing itself, the child tells the parent that | |
2933 | it is now traceable by the parent, and waits for the parent's | |
2934 | acknowledgement. The parent can then set the child's event mask, | |
2935 | and notify the child that it can now exec. | |
2936 | ||
2937 | (The acknowledgement by parent happens as a result of a call to | |
2938 | child_acknowledge_created_inferior.) | |
2939 | */ | |
2940 | int | |
fba45db2 | 2941 | parent_attach_all (void) |
c906108c | 2942 | { |
c5aa993b | 2943 | int tt_status; |
c906108c SS |
2944 | |
2945 | /* We need a memory home for a constant, to pass it to ttrace. | |
2946 | The value of the constant is arbitrary, so long as both | |
2947 | parent and child use the same value. Might as well use the | |
2948 | "magic" constant provided by ttrace... | |
2949 | */ | |
c5aa993b JM |
2950 | uint64_t tc_magic_child = TT_VERSION; |
2951 | uint64_t tc_magic_parent = 0; | |
c906108c SS |
2952 | |
2953 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
2954 | TT_PROC_SETTRC, |
2955 | (int) TT_NIL, | |
2956 | (lwpid_t) TT_NIL, | |
2957 | TT_NIL, | |
2958 | (TTRACE_ARG_TYPE) TT_VERSION, | |
2959 | TT_NIL); | |
c906108c SS |
2960 | |
2961 | if (tt_status < 0) | |
2962 | return tt_status; | |
2963 | ||
2964 | /* Notify the parent that we're potentially ready to exec(). */ | |
2965 | write (startup_semaphore.child_channel[SEM_TALK], | |
c5aa993b JM |
2966 | &tc_magic_child, |
2967 | sizeof (tc_magic_child)); | |
c906108c SS |
2968 | |
2969 | /* Wait for acknowledgement from the parent. */ | |
2970 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
c5aa993b JM |
2971 | &tc_magic_parent, |
2972 | sizeof (tc_magic_parent)); | |
2973 | ||
c906108c SS |
2974 | if (tc_magic_child != tc_magic_parent) |
2975 | warning ("mismatched semaphore magic"); | |
2976 | ||
2977 | /* Discard our copy of the semaphore. */ | |
2978 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
2979 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
2980 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
2981 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
c5aa993b | 2982 | |
c906108c SS |
2983 | return tt_status; |
2984 | } | |
2985 | ||
2986 | /* Despite being file-local, this routine is dealing with | |
2987 | * actual process IDs, not thread ids. That's because it's | |
2988 | * called before the first "wait" call, and there's no map | |
2989 | * yet from tids to pids. | |
2990 | * | |
2991 | * When it is called, a forked child is running, but waiting on | |
2992 | * the semaphore. If you stop the child and re-start it, | |
2993 | * things get confused, so don't do that! An attached child is | |
2994 | * stopped. | |
2995 | * | |
2996 | * Since this is called after either attach or run, we | |
2997 | * have to be the common part of both. | |
2998 | */ | |
2999 | static void | |
fba45db2 | 3000 | require_notification_of_events (int real_pid) |
c906108c | 3001 | { |
c5aa993b JM |
3002 | int tt_status; |
3003 | ttevent_t notifiable_events; | |
c906108c | 3004 | |
c5aa993b JM |
3005 | lwpid_t tid; |
3006 | ttstate_t thread_state; | |
c906108c SS |
3007 | |
3008 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3009 | if (debug_on) |
3010 | printf ("Require notif, pid is %d\n", real_pid); | |
c906108c SS |
3011 | #endif |
3012 | ||
3013 | /* Temporary HACK: tell inftarg.c/child_wait to not | |
3014 | * loop until pids are the same. | |
3015 | */ | |
3016 | not_same_real_pid = 0; | |
3017 | ||
3018 | sigemptyset (¬ifiable_events.tte_signals); | |
3019 | notifiable_events.tte_opts = TTEO_NONE; | |
3020 | ||
3021 | /* This ensures that forked children inherit their parent's | |
3022 | * event mask, which we're setting here. | |
3023 | * | |
3024 | * NOTE: if you debug gdb with itself, then the ultimate | |
3025 | * debuggee gets flags set by the outermost gdb, as | |
3026 | * a child of a child will still inherit. | |
3027 | */ | |
3028 | notifiable_events.tte_opts |= TTEO_PROC_INHERIT; | |
3029 | ||
c5aa993b | 3030 | notifiable_events.tte_events = TTEVT_DEFAULT; |
c906108c SS |
3031 | notifiable_events.tte_events |= TTEVT_SIGNAL; |
3032 | notifiable_events.tte_events |= TTEVT_EXEC; | |
3033 | notifiable_events.tte_events |= TTEVT_EXIT; | |
3034 | notifiable_events.tte_events |= TTEVT_FORK; | |
3035 | notifiable_events.tte_events |= TTEVT_VFORK; | |
3036 | notifiable_events.tte_events |= TTEVT_LWP_CREATE; | |
3037 | notifiable_events.tte_events |= TTEVT_LWP_EXIT; | |
3038 | notifiable_events.tte_events |= TTEVT_LWP_TERMINATE; | |
3039 | ||
3040 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
3041 | TT_PROC_SET_EVENT_MASK, |
3042 | real_pid, | |
3043 | (lwpid_t) TT_NIL, | |
3044 | (TTRACE_ARG_TYPE) & notifiable_events, | |
3045 | (TTRACE_ARG_TYPE) sizeof (notifiable_events), | |
3046 | TT_NIL); | |
c906108c SS |
3047 | } |
3048 | ||
3049 | static void | |
fba45db2 | 3050 | require_notification_of_exec_events (int real_pid) |
c906108c | 3051 | { |
c5aa993b JM |
3052 | int tt_status; |
3053 | ttevent_t notifiable_events; | |
c906108c | 3054 | |
c5aa993b JM |
3055 | lwpid_t tid; |
3056 | ttstate_t thread_state; | |
c906108c SS |
3057 | |
3058 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3059 | if (debug_on) |
3060 | printf ("Require notif, pid is %d\n", real_pid); | |
c906108c SS |
3061 | #endif |
3062 | ||
3063 | /* Temporary HACK: tell inftarg.c/child_wait to not | |
3064 | * loop until pids are the same. | |
3065 | */ | |
3066 | not_same_real_pid = 0; | |
3067 | ||
3068 | sigemptyset (¬ifiable_events.tte_signals); | |
3069 | notifiable_events.tte_opts = TTEO_NOSTRCCHLD; | |
3070 | ||
3071 | /* This ensures that forked children don't inherit their parent's | |
3072 | * event mask, which we're setting here. | |
3073 | */ | |
3074 | notifiable_events.tte_opts &= ~TTEO_PROC_INHERIT; | |
3075 | ||
c5aa993b | 3076 | notifiable_events.tte_events = TTEVT_DEFAULT; |
c906108c SS |
3077 | notifiable_events.tte_events |= TTEVT_EXEC; |
3078 | notifiable_events.tte_events |= TTEVT_EXIT; | |
3079 | ||
3080 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
3081 | TT_PROC_SET_EVENT_MASK, |
3082 | real_pid, | |
3083 | (lwpid_t) TT_NIL, | |
3084 | (TTRACE_ARG_TYPE) & notifiable_events, | |
3085 | (TTRACE_ARG_TYPE) sizeof (notifiable_events), | |
3086 | TT_NIL); | |
c906108c | 3087 | } |
c906108c | 3088 | \f |
c5aa993b | 3089 | |
c906108c SS |
3090 | /* This function is called by the parent process, with pid being the |
3091 | * ID of the child process, after the debugger has forked. | |
3092 | */ | |
3093 | void | |
fba45db2 | 3094 | child_acknowledge_created_inferior (int pid) |
c906108c SS |
3095 | { |
3096 | /* We need a memory home for a constant, to pass it to ttrace. | |
3097 | The value of the constant is arbitrary, so long as both | |
3098 | parent and child use the same value. Might as well use the | |
3099 | "magic" constant provided by ttrace... | |
c5aa993b JM |
3100 | */ |
3101 | uint64_t tc_magic_parent = TT_VERSION; | |
3102 | uint64_t tc_magic_child = 0; | |
c906108c SS |
3103 | |
3104 | /* Wait for the child to tell us that it has forked. */ | |
3105 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
c5aa993b JM |
3106 | &tc_magic_child, |
3107 | sizeof (tc_magic_child)); | |
c906108c SS |
3108 | |
3109 | /* Clear thread info now. We'd like to do this in | |
3110 | * "require...", but that messes up attach. | |
3111 | */ | |
c5aa993b | 3112 | clear_thread_info (); |
c906108c SS |
3113 | |
3114 | /* Tell the "rest of gdb" that the initial thread exists. | |
3115 | * This isn't really a hack. Other thread-based versions | |
3116 | * of gdb (e.g. gnu-nat.c) seem to do the same thing. | |
3117 | * | |
3118 | * Q: Why don't we also add this thread to the local | |
3119 | * list via "add_tthread"? | |
3120 | * | |
3121 | * A: Because we don't know the tid, and can't stop the | |
3122 | * the process safely to ask what it is. Anyway, we'll | |
3123 | * add it when it gets the EXEC event. | |
3124 | */ | |
c5aa993b | 3125 | add_thread (pid); /* in thread.c */ |
c906108c SS |
3126 | |
3127 | /* We can now set the child's ttrace event mask. | |
3128 | */ | |
3129 | require_notification_of_exec_events (pid); | |
3130 | ||
3131 | /* Tell ourselves that the process is running. | |
3132 | */ | |
3133 | process_state = RUNNING; | |
3134 | ||
3135 | /* Notify the child that it can exec. */ | |
3136 | write (startup_semaphore.parent_channel[SEM_TALK], | |
c5aa993b JM |
3137 | &tc_magic_parent, |
3138 | sizeof (tc_magic_parent)); | |
c906108c SS |
3139 | |
3140 | /* Discard our copy of the semaphore. */ | |
3141 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
3142 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
3143 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
3144 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
3145 | } | |
3146 | ||
3147 | ||
3148 | /* | |
3149 | * arrange for notification of all events by | |
3150 | * calling require_notification_of_events. | |
3151 | */ | |
3152 | void | |
fba45db2 | 3153 | child_post_startup_inferior (int real_pid) |
c906108c SS |
3154 | { |
3155 | require_notification_of_events (real_pid); | |
3156 | } | |
3157 | ||
3158 | /* From here on, we should expect tids rather than pids. | |
3159 | */ | |
3160 | static void | |
fba45db2 | 3161 | hppa_enable_catch_fork (int tid) |
c906108c | 3162 | { |
c5aa993b JM |
3163 | int tt_status; |
3164 | ttevent_t ttrace_events; | |
c906108c SS |
3165 | |
3166 | /* Get the set of events that are currently enabled. | |
3167 | */ | |
3168 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3169 | tid, |
3170 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3171 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3172 | TT_NIL); | |
c906108c SS |
3173 | if (errno) |
3174 | perror_with_name ("ttrace"); | |
3175 | ||
3176 | /* Add forks to that set. */ | |
3177 | ttrace_events.tte_events |= TTEVT_FORK; | |
3178 | ||
3179 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3180 | if (debug_on) |
3181 | printf ("enable fork, tid is %d\n", tid); | |
c906108c SS |
3182 | #endif |
3183 | ||
3184 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3185 | tid, |
3186 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3187 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3188 | TT_NIL); | |
c906108c SS |
3189 | if (errno) |
3190 | perror_with_name ("ttrace"); | |
3191 | } | |
3192 | ||
3193 | ||
3194 | static void | |
fba45db2 | 3195 | hppa_disable_catch_fork (int tid) |
c906108c | 3196 | { |
c5aa993b JM |
3197 | int tt_status; |
3198 | ttevent_t ttrace_events; | |
c906108c SS |
3199 | |
3200 | /* Get the set of events that are currently enabled. | |
3201 | */ | |
3202 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3203 | tid, |
3204 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3205 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3206 | TT_NIL); | |
c906108c SS |
3207 | |
3208 | if (errno) | |
3209 | perror_with_name ("ttrace"); | |
3210 | ||
3211 | /* Remove forks from that set. */ | |
3212 | ttrace_events.tte_events &= ~TTEVT_FORK; | |
3213 | ||
3214 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3215 | if (debug_on) |
3216 | printf ("disable fork, tid is %d\n", tid); | |
c906108c SS |
3217 | #endif |
3218 | ||
3219 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3220 | tid, |
3221 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3222 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3223 | TT_NIL); | |
c906108c SS |
3224 | |
3225 | if (errno) | |
3226 | perror_with_name ("ttrace"); | |
3227 | } | |
3228 | ||
3229 | ||
3230 | #if defined(CHILD_INSERT_FORK_CATCHPOINT) | |
3231 | int | |
fba45db2 | 3232 | child_insert_fork_catchpoint (int tid) |
c906108c SS |
3233 | { |
3234 | /* Enable reporting of fork events from the kernel. */ | |
3235 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3236 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3237 | */ |
c906108c SS |
3238 | return 0; |
3239 | } | |
3240 | #endif | |
3241 | ||
3242 | ||
3243 | #if defined(CHILD_REMOVE_FORK_CATCHPOINT) | |
3244 | int | |
fba45db2 | 3245 | child_remove_fork_catchpoint (int tid) |
c906108c SS |
3246 | { |
3247 | /* Disable reporting of fork events from the kernel. */ | |
3248 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3249 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3250 | */ |
c906108c SS |
3251 | return 0; |
3252 | } | |
3253 | #endif | |
3254 | ||
3255 | ||
3256 | static void | |
fba45db2 | 3257 | hppa_enable_catch_vfork (int tid) |
c906108c | 3258 | { |
c5aa993b JM |
3259 | int tt_status; |
3260 | ttevent_t ttrace_events; | |
c906108c SS |
3261 | |
3262 | /* Get the set of events that are currently enabled. | |
3263 | */ | |
3264 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3265 | tid, |
3266 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3267 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3268 | TT_NIL); | |
c906108c SS |
3269 | |
3270 | if (errno) | |
3271 | perror_with_name ("ttrace"); | |
3272 | ||
3273 | /* Add vforks to that set. */ | |
3274 | ttrace_events.tte_events |= TTEVT_VFORK; | |
3275 | ||
3276 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3277 | if (debug_on) |
3278 | printf ("enable vfork, tid is %d\n", tid); | |
c906108c SS |
3279 | #endif |
3280 | ||
3281 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3282 | tid, |
3283 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3284 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3285 | TT_NIL); | |
c906108c SS |
3286 | |
3287 | if (errno) | |
3288 | perror_with_name ("ttrace"); | |
3289 | } | |
3290 | ||
3291 | ||
3292 | static void | |
fba45db2 | 3293 | hppa_disable_catch_vfork (int tid) |
c906108c | 3294 | { |
c5aa993b JM |
3295 | int tt_status; |
3296 | ttevent_t ttrace_events; | |
c906108c SS |
3297 | |
3298 | /* Get the set of events that are currently enabled. */ | |
3299 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3300 | tid, |
3301 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3302 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3303 | TT_NIL); | |
c906108c SS |
3304 | |
3305 | if (errno) | |
3306 | perror_with_name ("ttrace"); | |
3307 | ||
3308 | /* Remove vforks from that set. */ | |
3309 | ttrace_events.tte_events &= ~TTEVT_VFORK; | |
3310 | ||
3311 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3312 | if (debug_on) |
3313 | printf ("disable vfork, tid is %d\n", tid); | |
c906108c SS |
3314 | #endif |
3315 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3316 | tid, |
3317 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3318 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3319 | TT_NIL); | |
c906108c SS |
3320 | |
3321 | if (errno) | |
3322 | perror_with_name ("ttrace"); | |
3323 | } | |
3324 | ||
3325 | ||
3326 | #if defined(CHILD_INSERT_VFORK_CATCHPOINT) | |
3327 | int | |
fba45db2 | 3328 | child_insert_vfork_catchpoint (int tid) |
c906108c SS |
3329 | { |
3330 | /* Enable reporting of vfork events from the kernel. */ | |
3331 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3332 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3333 | */ |
c906108c SS |
3334 | return 0; |
3335 | } | |
3336 | #endif | |
3337 | ||
3338 | ||
3339 | #if defined(CHILD_REMOVE_VFORK_CATCHPOINT) | |
3340 | int | |
fba45db2 | 3341 | child_remove_vfork_catchpoint (int tid) |
c906108c SS |
3342 | { |
3343 | /* Disable reporting of vfork events from the kernel. */ | |
3344 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3345 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3346 | */ |
c906108c SS |
3347 | return 0; |
3348 | } | |
3349 | #endif | |
3350 | ||
3351 | #if defined(CHILD_HAS_FORKED) | |
3352 | ||
3353 | /* Q: Do we need to map the returned process ID to a thread ID? | |
c5aa993b | 3354 | |
c906108c SS |
3355 | * A: I don't think so--here we want a _real_ pid. Any later |
3356 | * operations will call "require_notification_of_events" and | |
3357 | * start the mapping. | |
3358 | */ | |
3359 | int | |
fba45db2 | 3360 | child_has_forked (int tid, int *childpid) |
c906108c | 3361 | { |
c5aa993b JM |
3362 | int tt_status; |
3363 | ttstate_t ttrace_state; | |
3364 | thread_info *tinfo; | |
c906108c SS |
3365 | |
3366 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3367 | tinfo = find_thread_info (map_from_gdb_tid (tid)); | |
c5aa993b JM |
3368 | if (tinfo != NULL) |
3369 | { | |
3370 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3371 | } | |
c906108c SS |
3372 | |
3373 | /* Nope, must read the thread's current state */ | |
3374 | else | |
3375 | { | |
3376 | tt_status = call_ttrace (TT_LWP_GET_STATE, | |
c5aa993b JM |
3377 | tid, |
3378 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3379 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3380 | TT_NIL); | |
c906108c SS |
3381 | |
3382 | if (errno) | |
c5aa993b JM |
3383 | perror_with_name ("ttrace"); |
3384 | ||
c906108c | 3385 | if (tt_status < 0) |
c5aa993b | 3386 | return 0; |
c906108c SS |
3387 | } |
3388 | ||
3389 | if (ttrace_state.tts_event & TTEVT_FORK) | |
3390 | { | |
3391 | *childpid = ttrace_state.tts_u.tts_fork.tts_fpid; | |
3392 | return 1; | |
3393 | } | |
3394 | ||
3395 | return 0; | |
3396 | } | |
3397 | #endif | |
3398 | ||
3399 | ||
3400 | #if defined(CHILD_HAS_VFORKED) | |
3401 | ||
3402 | /* See child_has_forked for pid discussion. | |
3403 | */ | |
3404 | int | |
fba45db2 | 3405 | child_has_vforked (int tid, int *childpid) |
c906108c | 3406 | { |
c5aa993b JM |
3407 | int tt_status; |
3408 | ttstate_t ttrace_state; | |
3409 | thread_info *tinfo; | |
c906108c SS |
3410 | |
3411 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3412 | tinfo = find_thread_info (map_from_gdb_tid (tid)); | |
3413 | if (tinfo != NULL) | |
3414 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3415 | ||
3416 | /* Nope, must read the thread's current state */ | |
3417 | else | |
3418 | { | |
3419 | tt_status = call_ttrace (TT_LWP_GET_STATE, | |
c5aa993b JM |
3420 | tid, |
3421 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3422 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3423 | TT_NIL); | |
c906108c SS |
3424 | |
3425 | if (errno) | |
c5aa993b JM |
3426 | perror_with_name ("ttrace"); |
3427 | ||
c906108c | 3428 | if (tt_status < 0) |
c5aa993b | 3429 | return 0; |
c906108c SS |
3430 | } |
3431 | ||
3432 | if (ttrace_state.tts_event & TTEVT_VFORK) | |
3433 | { | |
3434 | *childpid = ttrace_state.tts_u.tts_fork.tts_fpid; | |
3435 | return 1; | |
3436 | } | |
3437 | ||
3438 | return 0; | |
3439 | } | |
3440 | #endif | |
3441 | ||
3442 | ||
3443 | #if defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC) | |
3444 | int | |
fba45db2 | 3445 | child_can_follow_vfork_prior_to_exec (void) |
c906108c SS |
3446 | { |
3447 | /* ttrace does allow this. | |
3448 | ||
3449 | ??rehrauer: However, I had major-league problems trying to | |
3450 | convince wait_for_inferior to handle that case. Perhaps when | |
3451 | it is rewritten to grok multiple processes in an explicit way... | |
c5aa993b | 3452 | */ |
c906108c SS |
3453 | return 0; |
3454 | } | |
3455 | #endif | |
3456 | ||
3457 | ||
3458 | #if defined(CHILD_INSERT_EXEC_CATCHPOINT) | |
3459 | int | |
fba45db2 | 3460 | child_insert_exec_catchpoint (int tid) |
c906108c SS |
3461 | { |
3462 | /* Enable reporting of exec events from the kernel. */ | |
3463 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3464 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3465 | */ |
c906108c SS |
3466 | return 0; |
3467 | } | |
3468 | #endif | |
3469 | ||
3470 | ||
3471 | #if defined(CHILD_REMOVE_EXEC_CATCHPOINT) | |
3472 | int | |
fba45db2 | 3473 | child_remove_exec_catchpoint (int tid) |
c906108c SS |
3474 | { |
3475 | /* Disable reporting of execevents from the kernel. */ | |
3476 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3477 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3478 | */ |
c906108c SS |
3479 | return 0; |
3480 | } | |
3481 | #endif | |
3482 | ||
3483 | ||
3484 | #if defined(CHILD_HAS_EXECD) | |
3485 | int | |
fba45db2 | 3486 | child_has_execd (int tid, char **execd_pathname) |
c906108c | 3487 | { |
c5aa993b JM |
3488 | int tt_status; |
3489 | ttstate_t ttrace_state; | |
3490 | thread_info *tinfo; | |
c906108c SS |
3491 | |
3492 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3493 | tinfo = find_thread_info (map_from_gdb_tid (tid)); | |
3494 | if (tinfo != NULL) | |
3495 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3496 | ||
3497 | /* Nope, must read the thread's current state */ | |
3498 | else | |
3499 | { | |
3500 | tt_status = call_ttrace (TT_LWP_GET_STATE, | |
c5aa993b JM |
3501 | tid, |
3502 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3503 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3504 | TT_NIL); | |
c906108c SS |
3505 | |
3506 | if (errno) | |
c5aa993b JM |
3507 | perror_with_name ("ttrace"); |
3508 | ||
c906108c | 3509 | if (tt_status < 0) |
c5aa993b | 3510 | return 0; |
c906108c SS |
3511 | } |
3512 | ||
3513 | if (ttrace_state.tts_event & TTEVT_EXEC) | |
3514 | { | |
3515 | /* See child_pid_to_exec_file in this file: this is a macro. | |
3516 | */ | |
c5aa993b JM |
3517 | char *exec_file = target_pid_to_exec_file (tid); |
3518 | ||
c906108c SS |
3519 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
3520 | return 1; | |
3521 | } | |
3522 | ||
3523 | return 0; | |
3524 | } | |
3525 | #endif | |
3526 | ||
3527 | ||
3528 | #if defined(CHILD_HAS_SYSCALL_EVENT) | |
3529 | int | |
fba45db2 | 3530 | child_has_syscall_event (int pid, enum target_waitkind *kind, int *syscall_id) |
c906108c | 3531 | { |
c5aa993b JM |
3532 | int tt_status; |
3533 | ttstate_t ttrace_state; | |
3534 | thread_info *tinfo; | |
c906108c SS |
3535 | |
3536 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3537 | tinfo = find_thread_info (map_from_gdb_tid (pid)); | |
3538 | if (tinfo != NULL) | |
3539 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3540 | ||
3541 | /* Nope, must read the thread's current state */ | |
3542 | else | |
3543 | { | |
c5aa993b JM |
3544 | tt_status = call_ttrace (TT_LWP_GET_STATE, |
3545 | pid, | |
3546 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3547 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3548 | TT_NIL); | |
c906108c SS |
3549 | |
3550 | if (errno) | |
c5aa993b JM |
3551 | perror_with_name ("ttrace"); |
3552 | ||
c906108c | 3553 | if (tt_status < 0) |
c5aa993b | 3554 | return 0; |
c906108c SS |
3555 | } |
3556 | ||
c5aa993b | 3557 | *kind = TARGET_WAITKIND_SPURIOUS; /* Until proven otherwise... */ |
c906108c SS |
3558 | *syscall_id = -1; |
3559 | ||
3560 | if (ttrace_state.tts_event & TTEVT_SYSCALL_ENTRY) | |
3561 | *kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
3562 | else if (ttrace_state.tts_event & TTEVT_SYSCALL_RETURN) | |
3563 | *kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
3564 | else | |
3565 | return 0; | |
3566 | ||
3567 | *syscall_id = ttrace_state.tts_scno; | |
3568 | return 1; | |
3569 | } | |
3570 | #endif | |
c5aa993b | 3571 | \f |
c906108c SS |
3572 | |
3573 | ||
c906108c SS |
3574 | #if defined(CHILD_THREAD_ALIVE) |
3575 | ||
3576 | /* Check to see if the given thread is alive. | |
c5aa993b | 3577 | |
c906108c SS |
3578 | * We'll trust the thread list, as the more correct |
3579 | * approach of stopping the process and spinning down | |
3580 | * the OS's thread list is _very_ expensive. | |
3581 | * | |
3582 | * May need a FIXME for that reason. | |
3583 | */ | |
3584 | int | |
fba45db2 | 3585 | child_thread_alive (lwpid_t gdb_tid) |
c906108c | 3586 | { |
c5aa993b | 3587 | lwpid_t tid; |
c906108c | 3588 | |
c5aa993b JM |
3589 | /* This spins down the lists twice. |
3590 | * Possible peformance improvement here! | |
3591 | */ | |
3592 | tid = map_from_gdb_tid (gdb_tid); | |
3593 | return !is_terminated (tid); | |
c906108c SS |
3594 | } |
3595 | ||
3596 | #endif | |
c5aa993b | 3597 | \f |
c906108c SS |
3598 | |
3599 | ||
c906108c SS |
3600 | /* This function attempts to read the specified number of bytes from the |
3601 | save_state_t that is our view into the hardware registers, starting at | |
3602 | ss_offset, and ending at ss_offset + sizeof_buf - 1 | |
3603 | ||
3604 | If this function succeeds, it deposits the fetched bytes into buf, | |
3605 | and returns 0. | |
3606 | ||
3607 | If it fails, it returns a negative result. The contents of buf are | |
3608 | undefined it this function fails. | |
c5aa993b | 3609 | */ |
c906108c | 3610 | int |
fba45db2 KB |
3611 | read_from_register_save_state (int tid, TTRACE_ARG_TYPE ss_offset, char *buf, |
3612 | int sizeof_buf) | |
c906108c | 3613 | { |
c5aa993b JM |
3614 | int tt_status; |
3615 | register_value_t register_value = 0; | |
c906108c SS |
3616 | |
3617 | tt_status = call_ttrace (TT_LWP_RUREGS, | |
c5aa993b JM |
3618 | tid, |
3619 | ss_offset, | |
3620 | (TTRACE_ARG_TYPE) sizeof_buf, | |
3621 | (TTRACE_ARG_TYPE) buf); | |
3622 | ||
3623 | if (tt_status == 1) | |
3624 | /* Map ttrace's version of success to our version. | |
3625 | * Sometime ttrace returns 0, but that's ok here. | |
3626 | */ | |
3627 | return 0; | |
3628 | ||
c906108c SS |
3629 | return tt_status; |
3630 | } | |
c906108c | 3631 | \f |
c5aa993b | 3632 | |
c906108c SS |
3633 | /* This function attempts to write the specified number of bytes to the |
3634 | save_state_t that is our view into the hardware registers, starting at | |
3635 | ss_offset, and ending at ss_offset + sizeof_buf - 1 | |
3636 | ||
3637 | If this function succeeds, it deposits the bytes in buf, and returns 0. | |
3638 | ||
3639 | If it fails, it returns a negative result. The contents of the save_state_t | |
3640 | are undefined it this function fails. | |
c5aa993b | 3641 | */ |
c906108c | 3642 | int |
fba45db2 KB |
3643 | write_to_register_save_state (int tid, TTRACE_ARG_TYPE ss_offset, char *buf, |
3644 | int sizeof_buf) | |
c906108c | 3645 | { |
c5aa993b JM |
3646 | int tt_status; |
3647 | register_value_t register_value = 0; | |
c906108c SS |
3648 | |
3649 | tt_status = call_ttrace (TT_LWP_WUREGS, | |
c5aa993b JM |
3650 | tid, |
3651 | ss_offset, | |
3652 | (TTRACE_ARG_TYPE) sizeof_buf, | |
3653 | (TTRACE_ARG_TYPE) buf); | |
c906108c SS |
3654 | return tt_status; |
3655 | } | |
c906108c | 3656 | \f |
c5aa993b | 3657 | |
c906108c SS |
3658 | /* This function is a sop to the largeish number of direct calls |
3659 | to call_ptrace that exist in other files. Rather than create | |
3660 | functions whose name abstracts away from ptrace, and change all | |
3661 | the present callers of call_ptrace, we'll do the expedient (and | |
3662 | perhaps only practical) thing. | |
3663 | ||
3664 | Note HP-UX explicitly disallows a mix of ptrace & ttrace on a traced | |
3665 | process. Thus, we must translate all ptrace requests into their | |
3666 | process-specific, ttrace equivalents. | |
c5aa993b | 3667 | */ |
c906108c | 3668 | int |
fba45db2 | 3669 | call_ptrace (int pt_request, int gdb_tid, PTRACE_ARG3_TYPE addr, int data) |
c906108c | 3670 | { |
c5aa993b JM |
3671 | ttreq_t tt_request; |
3672 | TTRACE_ARG_TYPE tt_addr = (TTRACE_ARG_TYPE) addr; | |
3673 | TTRACE_ARG_TYPE tt_data = (TTRACE_ARG_TYPE) data; | |
3674 | TTRACE_ARG_TYPE tt_addr2 = TT_NIL; | |
3675 | int tt_status; | |
3676 | register_value_t register_value; | |
3677 | int read_buf; | |
c906108c SS |
3678 | |
3679 | /* Perform the necessary argument translation. Note that some | |
3680 | cases are funky enough in the ttrace realm that we handle them | |
3681 | very specially. | |
3682 | */ | |
c5aa993b JM |
3683 | switch (pt_request) |
3684 | { | |
c906108c SS |
3685 | /* The following cases cannot conveniently be handled conveniently |
3686 | by merely adjusting the ptrace arguments and feeding into the | |
3687 | generic call to ttrace at the bottom of this function. | |
3688 | ||
3689 | Note that because all branches of this switch end in "return", | |
3690 | there's no need for any "break" statements. | |
c5aa993b JM |
3691 | */ |
3692 | case PT_SETTRC: | |
3693 | return parent_attach_all (); | |
3694 | ||
3695 | case PT_RUREGS: | |
3696 | tt_status = read_from_register_save_state (gdb_tid, | |
3697 | tt_addr, | |
3698 | ®ister_value, | |
3699 | sizeof (register_value)); | |
3700 | if (tt_status < 0) | |
3701 | return tt_status; | |
3702 | return register_value; | |
3703 | ||
3704 | case PT_WUREGS: | |
3705 | register_value = (int) tt_data; | |
3706 | tt_status = write_to_register_save_state (gdb_tid, | |
3707 | tt_addr, | |
3708 | ®ister_value, | |
3709 | sizeof (register_value)); | |
3710 | return tt_status; | |
3711 | break; | |
3712 | ||
3713 | case PT_READ_I: | |
3714 | tt_status = call_ttrace (TT_PROC_RDTEXT, /* Implicit 4-byte xfer becomes block-xfer. */ | |
3715 | gdb_tid, | |
3716 | tt_addr, | |
3717 | (TTRACE_ARG_TYPE) 4, | |
3718 | (TTRACE_ARG_TYPE) & read_buf); | |
3719 | if (tt_status < 0) | |
3720 | return tt_status; | |
3721 | return read_buf; | |
3722 | ||
3723 | case PT_READ_D: | |
3724 | tt_status = call_ttrace (TT_PROC_RDDATA, /* Implicit 4-byte xfer becomes block-xfer. */ | |
3725 | gdb_tid, | |
3726 | tt_addr, | |
3727 | (TTRACE_ARG_TYPE) 4, | |
3728 | (TTRACE_ARG_TYPE) & read_buf); | |
3729 | if (tt_status < 0) | |
3730 | return tt_status; | |
3731 | return read_buf; | |
3732 | ||
3733 | case PT_ATTACH: | |
3734 | tt_status = call_real_ttrace (TT_PROC_ATTACH, | |
3735 | map_from_gdb_tid (gdb_tid), | |
3736 | (lwpid_t) TT_NIL, | |
3737 | tt_addr, | |
3738 | (TTRACE_ARG_TYPE) TT_VERSION, | |
3739 | tt_addr2); | |
3740 | if (tt_status < 0) | |
3741 | return tt_status; | |
3742 | return tt_status; | |
c906108c SS |
3743 | |
3744 | /* The following cases are handled by merely adjusting the ptrace | |
3745 | arguments and feeding into the generic call to ttrace. | |
c5aa993b JM |
3746 | */ |
3747 | case PT_DETACH: | |
3748 | tt_request = TT_PROC_DETACH; | |
3749 | break; | |
3750 | ||
3751 | case PT_WRITE_I: | |
3752 | tt_request = TT_PROC_WRTEXT; /* Translates 4-byte xfer to block-xfer. */ | |
3753 | tt_data = 4; /* This many bytes. */ | |
3754 | tt_addr2 = (TTRACE_ARG_TYPE) & data; /* Address of xfer source. */ | |
3755 | break; | |
3756 | ||
3757 | case PT_WRITE_D: | |
3758 | tt_request = TT_PROC_WRDATA; /* Translates 4-byte xfer to block-xfer. */ | |
3759 | tt_data = 4; /* This many bytes. */ | |
3760 | tt_addr2 = (TTRACE_ARG_TYPE) & data; /* Address of xfer source. */ | |
3761 | break; | |
3762 | ||
3763 | case PT_RDTEXT: | |
3764 | tt_request = TT_PROC_RDTEXT; | |
3765 | break; | |
3766 | ||
3767 | case PT_RDDATA: | |
3768 | tt_request = TT_PROC_RDDATA; | |
3769 | break; | |
3770 | ||
3771 | case PT_WRTEXT: | |
3772 | tt_request = TT_PROC_WRTEXT; | |
3773 | break; | |
3774 | ||
3775 | case PT_WRDATA: | |
3776 | tt_request = TT_PROC_WRDATA; | |
3777 | break; | |
3778 | ||
3779 | case PT_CONTINUE: | |
3780 | tt_request = TT_PROC_CONTINUE; | |
3781 | break; | |
3782 | ||
3783 | case PT_STEP: | |
3784 | tt_request = TT_LWP_SINGLE; /* Should not be making this request? */ | |
3785 | break; | |
3786 | ||
3787 | case PT_KILL: | |
3788 | tt_request = TT_PROC_EXIT; | |
3789 | break; | |
3790 | ||
3791 | case PT_GET_PROCESS_PATHNAME: | |
3792 | tt_request = TT_PROC_GET_PATHNAME; | |
3793 | break; | |
3794 | ||
3795 | default: | |
3796 | tt_request = pt_request; /* Let ttrace be the one to complain. */ | |
3797 | break; | |
3798 | } | |
c906108c SS |
3799 | |
3800 | return call_ttrace (tt_request, | |
c5aa993b JM |
3801 | gdb_tid, |
3802 | tt_addr, | |
3803 | tt_data, | |
3804 | tt_addr2); | |
c906108c SS |
3805 | } |
3806 | ||
3807 | /* Kill that pesky process! | |
3808 | */ | |
3809 | void | |
fba45db2 | 3810 | kill_inferior (void) |
c906108c | 3811 | { |
c5aa993b JM |
3812 | int tid; |
3813 | int wait_status; | |
3814 | thread_info *t; | |
c906108c | 3815 | thread_info **paranoia; |
c5aa993b | 3816 | int para_count, i; |
c906108c SS |
3817 | |
3818 | if (inferior_pid == 0) | |
3819 | return; | |
3820 | ||
3821 | /* Walk the list of "threads", some of which are "pseudo threads", | |
3822 | aka "processes". For each that is NOT inferior_pid, stop it, | |
3823 | and detach it. | |
3824 | ||
3825 | You see, we may not have just a single process to kill. If we're | |
3826 | restarting or quitting or detaching just after the inferior has | |
3827 | forked, then we've actually two processes to clean up. | |
3828 | ||
3829 | But we can't just call target_mourn_inferior() for each, since that | |
3830 | zaps the target vector. | |
c5aa993b | 3831 | */ |
c906108c | 3832 | |
3c37485b AC |
3833 | paranoia = (thread_info **) xmalloc (thread_head.count * |
3834 | sizeof (thread_info *)); | |
c906108c | 3835 | para_count = 0; |
c5aa993b | 3836 | |
c906108c | 3837 | t = thread_head.head; |
c5aa993b JM |
3838 | while (t) |
3839 | { | |
3840 | ||
3841 | paranoia[para_count] = t; | |
3842 | for (i = 0; i < para_count; i++) | |
3843 | { | |
3844 | if (t->next == paranoia[i]) | |
3845 | { | |
3846 | warning ("Bad data in gdb's thread data; repairing."); | |
3847 | t->next = 0; | |
3848 | } | |
3849 | } | |
3850 | para_count++; | |
3851 | ||
3852 | if (t->am_pseudo && (t->pid != inferior_pid)) | |
3853 | { | |
3854 | /* TT_PROC_STOP doesn't require a subsequent ttrace_wait, as it | |
3855 | * generates no event. | |
3856 | */ | |
3857 | call_ttrace (TT_PROC_STOP, | |
3858 | t->pid, | |
3859 | TT_NIL, | |
3860 | TT_NIL, | |
3861 | TT_NIL); | |
3862 | ||
3863 | call_ttrace (TT_PROC_DETACH, | |
3864 | t->pid, | |
3865 | TT_NIL, | |
3866 | (TTRACE_ARG_TYPE) TARGET_SIGNAL_0, | |
3867 | TT_NIL); | |
3868 | } | |
3869 | t = t->next; | |
3870 | } | |
3871 | ||
b8c9b27d | 3872 | xfree (paranoia); |
c906108c | 3873 | |
c906108c | 3874 | call_ttrace (TT_PROC_STOP, |
c5aa993b JM |
3875 | inferior_pid, |
3876 | TT_NIL, | |
3877 | TT_NIL, | |
3878 | TT_NIL); | |
c906108c | 3879 | target_mourn_inferior (); |
c5aa993b | 3880 | clear_thread_info (); |
c906108c SS |
3881 | } |
3882 | ||
3883 | ||
3884 | #ifndef CHILD_RESUME | |
3885 | ||
3886 | /* Sanity check a thread about to be continued. | |
3887 | */ | |
3888 | static void | |
fba45db2 | 3889 | thread_dropping_event_check (thread_info *p) |
c906108c | 3890 | { |
c5aa993b JM |
3891 | if (!p->handled) |
3892 | { | |
3893 | /* | |
3894 | * This seems to happen when we "next" over a | |
3895 | * "fork()" while following the parent. If it's | |
3896 | * the FORK event, that's ok. If it's a SIGNAL | |
3897 | * in the unfollowed child, that's ok to--but | |
3898 | * how can we know that's what's going on? | |
3899 | * | |
3900 | * FIXME! | |
3901 | */ | |
3902 | if (p->have_state) | |
3903 | { | |
3904 | if (p->last_stop_state.tts_event == TTEVT_FORK) | |
3905 | { | |
3906 | /* Ok */ | |
3907 | ; | |
3908 | } | |
3909 | else if (p->last_stop_state.tts_event == TTEVT_SIGNAL) | |
3910 | { | |
3911 | /* Ok, close eyes and let it happen. | |
3912 | */ | |
3913 | ; | |
3914 | } | |
3915 | else | |
3916 | { | |
3917 | /* This shouldn't happen--we're dropping a | |
3918 | * real event. | |
3919 | */ | |
3920 | warning ("About to continue process %d, thread %d with unhandled event %s.", | |
3921 | p->pid, p->tid, | |
3922 | get_printable_name_of_ttrace_event ( | |
3923 | p->last_stop_state.tts_event)); | |
c906108c SS |
3924 | |
3925 | #ifdef PARANOIA | |
c5aa993b JM |
3926 | if (debug_on) |
3927 | print_tthread (p); | |
c906108c | 3928 | #endif |
c5aa993b JM |
3929 | } |
3930 | } | |
3931 | else | |
3932 | { | |
3933 | /* No saved state, have to assume it failed. | |
3934 | */ | |
3935 | warning ("About to continue process %d, thread %d with unhandled event.", | |
3936 | p->pid, p->tid); | |
c906108c | 3937 | #ifdef PARANOIA |
c5aa993b JM |
3938 | if (debug_on) |
3939 | print_tthread (p); | |
c906108c | 3940 | #endif |
c5aa993b | 3941 | } |
c906108c | 3942 | } |
c5aa993b JM |
3943 | |
3944 | } /* thread_dropping_event_check */ | |
c906108c SS |
3945 | |
3946 | /* Use a loop over the threads to continue all the threads but | |
3947 | * the one specified, which is to be stepped. | |
3948 | */ | |
3949 | static void | |
fba45db2 | 3950 | threads_continue_all_but_one (lwpid_t gdb_tid, int signal) |
c906108c | 3951 | { |
c5aa993b JM |
3952 | thread_info *p; |
3953 | int thread_signal; | |
3954 | lwpid_t real_tid; | |
3955 | lwpid_t scan_tid; | |
3956 | ttstate_t state; | |
3957 | int real_pid; | |
3958 | ||
c906108c | 3959 | #ifdef THREAD_DEBUG |
c5aa993b JM |
3960 | if (debug_on) |
3961 | printf ("Using loop over threads to step/resume with signals\n"); | |
c906108c SS |
3962 | #endif |
3963 | ||
c5aa993b JM |
3964 | /* First update the thread list. |
3965 | */ | |
3966 | set_all_unseen (); | |
3967 | real_tid = map_from_gdb_tid (gdb_tid); | |
3968 | real_pid = get_pid_for (real_tid); | |
3969 | ||
3970 | scan_tid = get_process_first_stopped_thread_id (real_pid, &state); | |
3971 | while (0 != scan_tid) | |
3972 | { | |
3973 | ||
c906108c | 3974 | #ifdef THREAD_DEBUG |
c5aa993b JM |
3975 | /* FIX: later should check state is stopped; |
3976 | * state.tts_flags & TTS_STATEMASK == TTS_WASSUSPENDED | |
3977 | */ | |
3978 | if (debug_on) | |
3979 | if (state.tts_flags & TTS_STATEMASK != TTS_WASSUSPENDED) | |
3980 | printf ("About to continue non-stopped thread %d\n", scan_tid); | |
c906108c SS |
3981 | #endif |
3982 | ||
c5aa993b JM |
3983 | p = find_thread_info (scan_tid); |
3984 | if (NULL == p) | |
3985 | { | |
3986 | add_tthread (real_pid, scan_tid); | |
3987 | p = find_thread_info (scan_tid); | |
3988 | ||
3989 | /* This is either a newly-created thread or the | |
3990 | * result of a fork; in either case there's no | |
3991 | * actual event to worry about. | |
3992 | */ | |
3993 | p->handled = 1; | |
3994 | ||
3995 | if (state.tts_event != TTEVT_NONE) | |
3996 | { | |
3997 | /* Oops, do need to worry! | |
3998 | */ | |
3999 | warning ("Unexpected thread with \"%s\" event.", | |
4000 | get_printable_name_of_ttrace_event (state.tts_event)); | |
4001 | } | |
4002 | } | |
4003 | else if (scan_tid != p->tid) | |
4004 | error ("Bad data in thread database."); | |
c906108c SS |
4005 | |
4006 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4007 | if (debug_on) |
4008 | if (p->terminated) | |
4009 | printf ("Why are we continuing a dead thread?\n"); | |
c906108c SS |
4010 | #endif |
4011 | ||
c5aa993b JM |
4012 | p->seen = 1; |
4013 | ||
4014 | scan_tid = get_process_next_stopped_thread_id (real_pid, &state); | |
c906108c SS |
4015 | } |
4016 | ||
c5aa993b JM |
4017 | /* Remove unseen threads. |
4018 | */ | |
4019 | update_thread_list (); | |
c906108c | 4020 | |
c5aa993b JM |
4021 | /* Now run down the thread list and continue or step. |
4022 | */ | |
4023 | for (p = thread_head.head; p; p = p->next) | |
4024 | { | |
4025 | ||
4026 | /* Sanity check. | |
4027 | */ | |
4028 | thread_dropping_event_check (p); | |
4029 | ||
4030 | /* Pass the correct signals along. | |
4031 | */ | |
4032 | if (p->have_signal) | |
4033 | { | |
4034 | thread_signal = p->signal_value; | |
4035 | p->have_signal = 0; | |
4036 | } | |
4037 | else | |
4038 | thread_signal = 0; | |
4039 | ||
4040 | if (p->tid != real_tid) | |
4041 | { | |
4042 | /* | |
4043 | * Not the thread of interest, so continue it | |
4044 | * as the user expects. | |
4045 | */ | |
4046 | if (p->stepping_mode == DO_STEP) | |
4047 | { | |
4048 | /* Just step this thread. | |
4049 | */ | |
4050 | call_ttrace ( | |
4051 | TT_LWP_SINGLE, | |
4052 | p->tid, | |
4053 | TT_USE_CURRENT_PC, | |
4054 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4055 | TT_NIL); | |
4056 | } | |
4057 | else | |
4058 | { | |
4059 | /* Regular continue (default case). | |
4060 | */ | |
4061 | call_ttrace ( | |
4062 | TT_LWP_CONTINUE, | |
4063 | p->tid, | |
4064 | TT_USE_CURRENT_PC, | |
4065 | (TTRACE_ARG_TYPE) target_signal_to_host (thread_signal), | |
4066 | TT_NIL); | |
4067 | } | |
4068 | } | |
4069 | else | |
4070 | { | |
4071 | /* Step the thread of interest. | |
4072 | */ | |
4073 | call_ttrace ( | |
4074 | TT_LWP_SINGLE, | |
4075 | real_tid, | |
4076 | TT_USE_CURRENT_PC, | |
4077 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4078 | TT_NIL); | |
4079 | } | |
4080 | } /* Loop over threads */ | |
4081 | } /* End threads_continue_all_but_one */ | |
c906108c SS |
4082 | |
4083 | /* Use a loop over the threads to continue all the threads. | |
4084 | * This is done when a signal must be sent to any of the threads. | |
4085 | */ | |
4086 | static void | |
fba45db2 | 4087 | threads_continue_all_with_signals (lwpid_t gdb_tid, int signal) |
c906108c | 4088 | { |
c5aa993b JM |
4089 | thread_info *p; |
4090 | int thread_signal; | |
4091 | lwpid_t real_tid; | |
4092 | lwpid_t scan_tid; | |
4093 | ttstate_t state; | |
4094 | int real_pid; | |
c906108c SS |
4095 | |
4096 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4097 | if (debug_on) |
4098 | printf ("Using loop over threads to resume with signals\n"); | |
c906108c SS |
4099 | #endif |
4100 | ||
c5aa993b JM |
4101 | /* Scan and update thread list. |
4102 | */ | |
4103 | set_all_unseen (); | |
4104 | real_tid = map_from_gdb_tid (gdb_tid); | |
4105 | real_pid = get_pid_for (real_tid); | |
4106 | ||
4107 | scan_tid = get_process_first_stopped_thread_id (real_pid, &state); | |
4108 | while (0 != scan_tid) | |
4109 | { | |
4110 | ||
4111 | #ifdef THREAD_DEBUG | |
4112 | if (debug_on) | |
4113 | if (state.tts_flags & TTS_STATEMASK != TTS_WASSUSPENDED) | |
4114 | warning ("About to continue non-stopped thread %d\n", scan_tid); | |
4115 | #endif | |
4116 | ||
4117 | p = find_thread_info (scan_tid); | |
4118 | if (NULL == p) | |
4119 | { | |
4120 | add_tthread (real_pid, scan_tid); | |
4121 | p = find_thread_info (scan_tid); | |
4122 | ||
4123 | /* This is either a newly-created thread or the | |
4124 | * result of a fork; in either case there's no | |
4125 | * actual event to worry about. | |
4126 | */ | |
4127 | p->handled = 1; | |
4128 | ||
4129 | if (state.tts_event != TTEVT_NONE) | |
4130 | { | |
4131 | /* Oops, do need to worry! | |
4132 | */ | |
4133 | warning ("Unexpected thread with \"%s\" event.", | |
4134 | get_printable_name_of_ttrace_event (state.tts_event)); | |
4135 | } | |
4136 | } | |
c906108c | 4137 | |
c906108c | 4138 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4139 | if (debug_on) |
4140 | if (p->terminated) | |
4141 | printf ("Why are we continuing a dead thread? (1)\n"); | |
c906108c SS |
4142 | #endif |
4143 | ||
c5aa993b | 4144 | p->seen = 1; |
c906108c | 4145 | |
c5aa993b JM |
4146 | scan_tid = get_process_next_stopped_thread_id (real_pid, &state); |
4147 | } | |
c906108c | 4148 | |
c5aa993b JM |
4149 | /* Remove unseen threads from our list. |
4150 | */ | |
4151 | update_thread_list (); | |
c906108c | 4152 | |
c5aa993b JM |
4153 | /* Continue the threads. |
4154 | */ | |
4155 | for (p = thread_head.head; p; p = p->next) | |
4156 | { | |
c906108c | 4157 | |
c5aa993b JM |
4158 | /* Sanity check. |
4159 | */ | |
4160 | thread_dropping_event_check (p); | |
c906108c | 4161 | |
c5aa993b JM |
4162 | /* Pass the correct signals along. |
4163 | */ | |
4164 | if (p->tid == real_tid) | |
4165 | { | |
4166 | thread_signal = signal; | |
4167 | p->have_signal = 0; | |
4168 | } | |
4169 | else if (p->have_signal) | |
4170 | { | |
4171 | thread_signal = p->signal_value; | |
4172 | p->have_signal = 0; | |
4173 | } | |
4174 | else | |
4175 | thread_signal = 0; | |
4176 | ||
4177 | if (p->stepping_mode == DO_STEP) | |
4178 | { | |
4179 | call_ttrace ( | |
4180 | TT_LWP_SINGLE, | |
4181 | p->tid, | |
4182 | TT_USE_CURRENT_PC, | |
4183 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4184 | TT_NIL); | |
4185 | } | |
4186 | else | |
4187 | { | |
4188 | /* Continue this thread (default case). | |
4189 | */ | |
4190 | call_ttrace ( | |
4191 | TT_LWP_CONTINUE, | |
4192 | p->tid, | |
4193 | TT_USE_CURRENT_PC, | |
4194 | (TTRACE_ARG_TYPE) target_signal_to_host (thread_signal), | |
4195 | TT_NIL); | |
4196 | } | |
4197 | } | |
4198 | } /* End threads_continue_all_with_signals */ | |
c906108c SS |
4199 | |
4200 | /* Step one thread only. | |
4201 | */ | |
4202 | static void | |
fba45db2 | 4203 | thread_fake_step (lwpid_t tid, enum target_signal signal) |
c906108c | 4204 | { |
c5aa993b | 4205 | thread_info *p; |
c906108c SS |
4206 | |
4207 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4208 | if (debug_on) |
4209 | { | |
4210 | printf ("Doing a fake-step over a bpt, etc. for %d\n", tid); | |
c906108c | 4211 | |
c5aa993b JM |
4212 | if (is_terminated (tid)) |
4213 | printf ("Why are we continuing a dead thread? (4)\n"); | |
c906108c SS |
4214 | } |
4215 | #endif | |
c906108c | 4216 | |
c5aa993b JM |
4217 | if (doing_fake_step) |
4218 | warning ("Step while step already in progress."); | |
4219 | ||
4220 | /* See if there's a saved signal value for this | |
4221 | * thread to be passed on, but no current signal. | |
4222 | */ | |
4223 | p = find_thread_info (tid); | |
4224 | if (p != NULL) | |
4225 | { | |
a0b3c4fd | 4226 | if (p->have_signal && signal == TARGET_SIGNAL_0) |
c5aa993b JM |
4227 | { |
4228 | /* Pass on a saved signal. | |
4229 | */ | |
4230 | signal = p->signal_value; | |
4231 | } | |
4232 | ||
4233 | p->have_signal = 0; | |
4234 | } | |
4235 | ||
4236 | if (!p->handled) | |
4237 | warning ("Internal error: continuing unhandled thread."); | |
c906108c | 4238 | |
c5aa993b JM |
4239 | call_ttrace (TT_LWP_SINGLE, |
4240 | tid, | |
4241 | TT_USE_CURRENT_PC, | |
4242 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4243 | TT_NIL); | |
4244 | ||
4245 | /* Do bookkeeping so "call_ttrace_wait" knows it has to wait | |
4246 | * for this thread only, and clear any saved signal info. | |
4247 | */ | |
4248 | doing_fake_step = 1; | |
4249 | fake_step_tid = tid; | |
4250 | ||
4251 | } /* End thread_fake_step */ | |
c906108c SS |
4252 | |
4253 | /* Continue one thread when a signal must be sent to it. | |
4254 | */ | |
4255 | static void | |
fba45db2 | 4256 | threads_continue_one_with_signal (lwpid_t gdb_tid, int signal) |
c906108c | 4257 | { |
c5aa993b JM |
4258 | thread_info *p; |
4259 | lwpid_t real_tid; | |
4260 | int real_pid; | |
4261 | ||
c906108c | 4262 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4263 | if (debug_on) |
4264 | printf ("Continuing one thread with a signal\n"); | |
c906108c SS |
4265 | #endif |
4266 | ||
c5aa993b JM |
4267 | real_tid = map_from_gdb_tid (gdb_tid); |
4268 | real_pid = get_pid_for (real_tid); | |
c906108c | 4269 | |
c5aa993b JM |
4270 | p = find_thread_info (real_tid); |
4271 | if (NULL == p) | |
4272 | { | |
4273 | add_tthread (real_pid, real_tid); | |
c906108c SS |
4274 | } |
4275 | ||
4276 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4277 | if (debug_on) |
4278 | if (p->terminated) | |
4279 | printf ("Why are we continuing a dead thread? (2)\n"); | |
c906108c SS |
4280 | #endif |
4281 | ||
c5aa993b JM |
4282 | if (!p->handled) |
4283 | warning ("Internal error: continuing unhandled thread."); | |
4284 | ||
4285 | p->have_signal = 0; | |
4286 | ||
4287 | call_ttrace (TT_LWP_CONTINUE, | |
4288 | gdb_tid, | |
4289 | TT_USE_CURRENT_PC, | |
4290 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4291 | TT_NIL); | |
c906108c SS |
4292 | } |
4293 | #endif | |
4294 | ||
4295 | #ifndef CHILD_RESUME | |
4296 | ||
4297 | /* Resume execution of the inferior process. | |
c5aa993b | 4298 | |
c906108c SS |
4299 | * This routine is in charge of setting the "handled" bits. |
4300 | * | |
4301 | * If STEP is zero, continue it. | |
4302 | * If STEP is nonzero, single-step it. | |
4303 | * | |
4304 | * If SIGNAL is nonzero, give it that signal. | |
4305 | * | |
4306 | * If TID is -1, apply to all threads. | |
4307 | * If TID is not -1, apply to specified thread. | |
4308 | * | |
4309 | * STEP | |
4310 | * \ !0 0 | |
4311 | * TID \________________________________________________ | |
4312 | * | | |
4313 | * -1 | Step current Continue all threads | |
4314 | * | thread and (but which gets any | |
4315 | * | continue others signal?--We look at | |
4316 | * | "inferior_pid") | |
4317 | * | | |
4318 | * N | Step _this_ thread Continue _this_ thread | |
4319 | * | and leave others and leave others | |
4320 | * | stopped; internally stopped; used only for | |
4321 | * | used by gdb, never hardware watchpoints | |
4322 | * | a user command. and attach, never a | |
4323 | * | user command. | |
4324 | */ | |
4325 | void | |
fba45db2 | 4326 | child_resume (lwpid_t gdb_tid, int step, enum target_signal signal) |
c906108c | 4327 | { |
c5aa993b | 4328 | int resume_all_threads; |
c906108c | 4329 | lwpid_t tid; |
c5aa993b | 4330 | process_state_t new_process_state; |
c906108c SS |
4331 | |
4332 | resume_all_threads = | |
4333 | (gdb_tid == INFTTRACE_ALL_THREADS) || | |
4334 | (vfork_in_flight); | |
4335 | ||
c5aa993b JM |
4336 | if (resume_all_threads) |
4337 | { | |
4338 | /* Resume all threads, but first pick a tid value | |
4339 | * so we can get the pid when in call_ttrace doing | |
4340 | * the map. | |
4341 | */ | |
4342 | if (vfork_in_flight) | |
4343 | tid = vforking_child_pid; | |
4344 | else | |
4345 | tid = map_from_gdb_tid (inferior_pid); | |
4346 | } | |
c906108c | 4347 | else |
c5aa993b | 4348 | tid = map_from_gdb_tid (gdb_tid); |
c906108c SS |
4349 | |
4350 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4351 | if (debug_on) |
4352 | { | |
4353 | if (more_events_left) | |
4354 | printf ("More events; "); | |
c906108c | 4355 | |
c5aa993b JM |
4356 | if (signal != 0) |
4357 | printf ("Sending signal %d; ", signal); | |
4358 | ||
4359 | if (resume_all_threads) | |
4360 | { | |
4361 | if (step == 0) | |
4362 | printf ("Continue process %d\n", tid); | |
4363 | else | |
4364 | printf ("Step/continue thread %d\n", tid); | |
4365 | } | |
4366 | else | |
4367 | { | |
4368 | if (step == 0) | |
4369 | printf ("Continue thread %d\n", tid); | |
4370 | else | |
4371 | printf ("Step just thread %d\n", tid); | |
4372 | } | |
4373 | ||
4374 | if (vfork_in_flight) | |
4375 | printf ("Vfork in flight\n"); | |
4376 | } | |
c906108c SS |
4377 | #endif |
4378 | ||
c5aa993b JM |
4379 | if (process_state == RUNNING) |
4380 | warning ("Internal error in resume logic; doing resume or step anyway."); | |
4381 | ||
4382 | if (!step /* Asked to continue... */ | |
4383 | && resume_all_threads /* whole process.. */ | |
4384 | && signal != 0 /* with a signal... */ | |
4385 | && more_events_left > 0) | |
4386 | { /* but we can't yet--save it! */ | |
c906108c SS |
4387 | |
4388 | /* Continue with signal means we have to set the pending | |
4389 | * signal value for this thread. | |
4390 | */ | |
4391 | thread_info *k; | |
c5aa993b | 4392 | |
c906108c | 4393 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4394 | if (debug_on) |
4395 | printf ("Saving signal %d for thread %d\n", signal, tid); | |
c906108c SS |
4396 | #endif |
4397 | ||
c5aa993b JM |
4398 | k = find_thread_info (tid); |
4399 | if (k != NULL) | |
4400 | { | |
4401 | k->have_signal = 1; | |
4402 | k->signal_value = signal; | |
c906108c SS |
4403 | |
4404 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4405 | if (debug_on) |
4406 | if (k->terminated) | |
4407 | printf ("Why are we continuing a dead thread? (3)\n"); | |
c906108c SS |
4408 | #endif |
4409 | ||
c5aa993b | 4410 | } |
c906108c SS |
4411 | |
4412 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4413 | else if (debug_on) |
4414 | { | |
4415 | printf ("No thread info for tid %d\n", tid); | |
4416 | } | |
c906108c | 4417 | #endif |
c5aa993b | 4418 | } |
c906108c SS |
4419 | |
4420 | /* Are we faking this "continue" or "step"? | |
c5aa993b | 4421 | |
c906108c SS |
4422 | * We used to do steps by continuing all the threads for |
4423 | * which the events had been handled already. While | |
4424 | * conceptually nicer (hides it all in a lower level), this | |
4425 | * can lead to starvation and a hang (e.g. all but one thread | |
4426 | * are unhandled at a breakpoint just before a "join" operation, | |
4427 | * and one thread is in the join, and the user wants to step that | |
4428 | * thread). | |
4429 | */ | |
c5aa993b JM |
4430 | if (resume_all_threads /* Whole process, therefore user command */ |
4431 | && more_events_left > 0) | |
4432 | { /* But we can't do this yet--fake it! */ | |
c906108c | 4433 | thread_info *p; |
c5aa993b JM |
4434 | |
4435 | if (!step) | |
4436 | { | |
4437 | /* No need to do any notes on a per-thread | |
4438 | * basis--we're done! | |
4439 | */ | |
c906108c | 4440 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
4441 | if (debug_on) |
4442 | printf ("Faking a process resume.\n"); | |
c906108c SS |
4443 | #endif |
4444 | ||
c5aa993b JM |
4445 | return; |
4446 | } | |
4447 | else | |
4448 | { | |
c906108c SS |
4449 | |
4450 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
4451 | if (debug_on) |
4452 | printf ("Faking a process step.\n"); | |
c906108c SS |
4453 | #endif |
4454 | ||
c5aa993b JM |
4455 | } |
4456 | ||
4457 | p = find_thread_info (tid); | |
4458 | if (p == NULL) | |
4459 | { | |
4460 | warning ("No thread information for tid %d, 'next' command ignored.\n", tid); | |
4461 | return; | |
4462 | } | |
4463 | else | |
4464 | { | |
c906108c SS |
4465 | |
4466 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4467 | if (debug_on) |
4468 | if (p->terminated) | |
4469 | printf ("Why are we continuing a dead thread? (3.5)\n"); | |
c906108c SS |
4470 | #endif |
4471 | ||
c5aa993b JM |
4472 | if (p->stepping_mode != DO_DEFAULT) |
4473 | { | |
4474 | warning ("Step or continue command applied to thread which is already stepping or continuing; command ignored."); | |
c906108c | 4475 | |
c5aa993b JM |
4476 | return; |
4477 | } | |
c906108c | 4478 | |
c5aa993b JM |
4479 | if (step) |
4480 | p->stepping_mode = DO_STEP; | |
4481 | else | |
4482 | p->stepping_mode = DO_CONTINUE; | |
c906108c | 4483 | |
c5aa993b JM |
4484 | return; |
4485 | } /* Have thread info */ | |
4486 | } /* Must fake step or go */ | |
c906108c SS |
4487 | |
4488 | /* Execept for fake-steps, from here on we know we are | |
4489 | * going to wind up with a running process which will | |
4490 | * need a real wait. | |
4491 | */ | |
4492 | new_process_state = RUNNING; | |
4493 | ||
4494 | /* An address of TT_USE_CURRENT_PC tells ttrace to continue from where | |
4495 | * it was. (If GDB wanted it to start some other way, we have already | |
4496 | * written a new PC value to the child.) | |
4497 | * | |
4498 | * If this system does not support PT_STEP, a higher level function will | |
4499 | * have called single_step() to transmute the step request into a | |
4500 | * continue request (by setting breakpoints on all possible successor | |
4501 | * instructions), so we don't have to worry about that here. | |
4502 | */ | |
c5aa993b JM |
4503 | if (step) |
4504 | { | |
4505 | if (resume_all_threads) | |
4506 | { | |
4507 | /* | |
4508 | * Regular user step: other threads get a "continue". | |
4509 | */ | |
4510 | threads_continue_all_but_one (tid, signal); | |
4511 | clear_all_handled (); | |
4512 | clear_all_stepping_mode (); | |
4513 | } | |
4514 | ||
4515 | else | |
4516 | { | |
4517 | /* "Fake step": gdb is stepping one thread over a | |
4518 | * breakpoint, watchpoint, or out of a library load | |
4519 | * event, etc. The rest just stay where they are. | |
4520 | * | |
4521 | * Also used when there are pending events: we really | |
4522 | * step the current thread, but leave the rest stopped. | |
4523 | * Users can't request this, but "wait_for_inferior" | |
4524 | * does--a lot! | |
4525 | */ | |
4526 | thread_fake_step (tid, signal); | |
4527 | ||
4528 | /* Clear the "handled" state of this thread, because | |
4529 | * we'll soon get a new event for it. Other events | |
4530 | * stay as they were. | |
4531 | */ | |
4532 | clear_handled (tid); | |
4533 | clear_stepping_mode (tid); | |
4534 | new_process_state = FAKE_STEPPING; | |
4535 | } | |
4536 | } | |
4537 | ||
4538 | else | |
4539 | { | |
c906108c SS |
4540 | /* TT_LWP_CONTINUE can pass signals to threads, |
4541 | * TT_PROC_CONTINUE can't. So if there are any | |
4542 | * signals to pass, we have to use the (slower) | |
4543 | * loop over the stopped threads. | |
4544 | * | |
4545 | * Equally, if we have to not continue some threads, | |
4546 | * due to saved events, we have to use the loop. | |
4547 | */ | |
c5aa993b JM |
4548 | if ((signal != 0) || saved_signals_exist ()) |
4549 | { | |
4550 | if (resume_all_threads) | |
4551 | { | |
c906108c SS |
4552 | |
4553 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4554 | if (debug_on) |
4555 | printf ("Doing a continue by loop of all threads\n"); | |
c906108c SS |
4556 | #endif |
4557 | ||
c5aa993b | 4558 | threads_continue_all_with_signals (tid, signal); |
c906108c | 4559 | |
c5aa993b JM |
4560 | clear_all_handled (); |
4561 | clear_all_stepping_mode (); | |
4562 | } | |
c906108c | 4563 | |
c5aa993b JM |
4564 | else |
4565 | { | |
c906108c | 4566 | #ifdef THREAD_DEBUG |
c5aa993b | 4567 | printf ("Doing a continue w/signal of just thread %d\n", tid); |
c906108c SS |
4568 | #endif |
4569 | ||
c5aa993b JM |
4570 | threads_continue_one_with_signal (tid, signal); |
4571 | ||
4572 | /* Clear the "handled" state of this thread, because | |
4573 | * we'll soon get a new event for it. Other events | |
4574 | * can stay as they were. | |
4575 | */ | |
4576 | clear_handled (tid); | |
4577 | clear_stepping_mode (tid); | |
4578 | } | |
4579 | } | |
4580 | ||
4581 | else | |
4582 | { | |
4583 | /* No signals to send. | |
4584 | */ | |
4585 | if (resume_all_threads) | |
4586 | { | |
c906108c | 4587 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4588 | if (debug_on) |
4589 | printf ("Doing a continue by process of process %d\n", tid); | |
c906108c SS |
4590 | #endif |
4591 | ||
c5aa993b JM |
4592 | if (more_events_left > 0) |
4593 | { | |
4594 | warning ("Losing buffered events on continue."); | |
4595 | more_events_left = 0; | |
4596 | } | |
c906108c | 4597 | |
c5aa993b JM |
4598 | call_ttrace (TT_PROC_CONTINUE, |
4599 | tid, | |
4600 | TT_NIL, | |
4601 | TT_NIL, | |
4602 | TT_NIL); | |
c906108c | 4603 | |
c5aa993b JM |
4604 | clear_all_handled (); |
4605 | clear_all_stepping_mode (); | |
4606 | } | |
c906108c | 4607 | |
c5aa993b JM |
4608 | else |
4609 | { | |
c906108c | 4610 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4611 | if (debug_on) |
4612 | { | |
4613 | printf ("Doing a continue of just thread %d\n", tid); | |
4614 | if (is_terminated (tid)) | |
4615 | printf ("Why are we continuing a dead thread? (5)\n"); | |
4616 | } | |
c906108c SS |
4617 | #endif |
4618 | ||
c5aa993b JM |
4619 | call_ttrace (TT_LWP_CONTINUE, |
4620 | tid, | |
4621 | TT_NIL, | |
4622 | TT_NIL, | |
4623 | TT_NIL); | |
4624 | ||
4625 | /* Clear the "handled" state of this thread, because | |
4626 | * we'll soon get a new event for it. Other events | |
4627 | * can stay as they were. | |
4628 | */ | |
4629 | clear_handled (tid); | |
4630 | clear_stepping_mode (tid); | |
4631 | } | |
4632 | } | |
4633 | } | |
c906108c SS |
4634 | |
4635 | process_state = new_process_state; | |
4636 | ||
4637 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
4638 | if (debug_on) |
4639 | printf ("Process set to %s\n", | |
4640 | get_printable_name_of_process_state (process_state)); | |
c906108c SS |
4641 | #endif |
4642 | ||
4643 | } | |
4644 | #endif /* CHILD_RESUME */ | |
c906108c | 4645 | \f |
c5aa993b | 4646 | |
c906108c SS |
4647 | #ifdef ATTACH_DETACH |
4648 | /* | |
4649 | * Like it says. | |
4650 | * | |
4651 | * One worry is that we may not be attaching to "inferior_pid" | |
4652 | * and thus may not want to clear out our data. FIXME? | |
4653 | * | |
4654 | */ | |
4655 | static void | |
fba45db2 | 4656 | update_thread_state_after_attach (int pid, attach_continue_t kind_of_go) |
c906108c | 4657 | { |
c5aa993b JM |
4658 | int tt_status; |
4659 | ttstate_t thread_state; | |
4660 | lwpid_t a_thread; | |
4661 | lwpid_t tid; | |
c906108c SS |
4662 | |
4663 | /* The process better be stopped. | |
4664 | */ | |
c5aa993b JM |
4665 | if (process_state != STOPPED |
4666 | && process_state != VFORKING) | |
4667 | warning ("Internal error attaching."); | |
c906108c SS |
4668 | |
4669 | /* Clear out old tthread info and start over. This has the | |
4670 | * side effect of ensuring that the TRAP is reported as being | |
4671 | * in the right thread (re-mapped from tid to pid). | |
4672 | * | |
4673 | * It's because we need to add the tthread _now_ that we | |
4674 | * need to call "clear_thread_info" _now_, and that's why | |
4675 | * "require_notification_of_events" doesn't clear the thread | |
4676 | * info (it's called later than this routine). | |
4677 | */ | |
c5aa993b | 4678 | clear_thread_info (); |
c906108c SS |
4679 | a_thread = 0; |
4680 | ||
4681 | for (tid = get_process_first_stopped_thread_id (pid, &thread_state); | |
4682 | tid != 0; | |
4683 | tid = get_process_next_stopped_thread_id (pid, &thread_state)) | |
4684 | { | |
4685 | thread_info *p; | |
c5aa993b | 4686 | |
c906108c | 4687 | if (a_thread == 0) |
c5aa993b JM |
4688 | { |
4689 | a_thread = tid; | |
c906108c | 4690 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4691 | if (debug_on) |
4692 | printf ("Attaching to process %d, thread %d\n", | |
4693 | pid, a_thread); | |
c906108c | 4694 | #endif |
c5aa993b | 4695 | } |
c906108c SS |
4696 | |
4697 | /* Tell ourselves and the "rest of gdb" that this thread | |
4698 | * exists. | |
4699 | * | |
4700 | * This isn't really a hack. Other thread-based versions | |
4701 | * of gdb (e.g. gnu-nat.c) seem to do the same thing. | |
4702 | * | |
4703 | * We don't need to do mapping here, as we know this | |
4704 | * is the first thread and thus gets the real pid | |
4705 | * (and is "inferior_pid"). | |
4706 | * | |
4707 | * NOTE: it probably isn't the originating thread, | |
4708 | * but that doesn't matter (we hope!). | |
4709 | */ | |
c5aa993b JM |
4710 | add_tthread (pid, tid); |
4711 | p = find_thread_info (tid); | |
4712 | if (NULL == p) /* ?We just added it! */ | |
4713 | error ("Internal error adding a thread on attach."); | |
4714 | ||
8c6b089e | 4715 | copy_ttstate_t (&p->last_stop_state, &thread_state); |
c906108c | 4716 | p->have_state = 1; |
c5aa993b JM |
4717 | |
4718 | if (DO_ATTACH_CONTINUE == kind_of_go) | |
4719 | { | |
4720 | /* | |
4721 | * If we are going to CONTINUE afterwards, | |
4722 | * raising a SIGTRAP, don't bother trying to | |
4723 | * handle this event. But check first! | |
4724 | */ | |
4725 | switch (p->last_stop_state.tts_event) | |
4726 | { | |
4727 | ||
4728 | case TTEVT_NONE: | |
4729 | /* Ok to set this handled. | |
4730 | */ | |
4731 | break; | |
4732 | ||
4733 | default: | |
4734 | warning ("Internal error; skipping event %s on process %d, thread %d.", | |
4735 | get_printable_name_of_ttrace_event ( | |
4736 | p->last_stop_state.tts_event), | |
4737 | p->pid, p->tid); | |
4738 | } | |
4739 | ||
4740 | set_handled (pid, tid); | |
4741 | ||
4742 | } | |
4743 | else | |
4744 | { | |
4745 | /* There will be no "continue" opertion, so the | |
4746 | * process remains stopped. Don't set any events | |
4747 | * handled except the "gimmies". | |
4748 | */ | |
4749 | switch (p->last_stop_state.tts_event) | |
4750 | { | |
4751 | ||
4752 | case TTEVT_NONE: | |
4753 | /* Ok to ignore this. | |
4754 | */ | |
4755 | set_handled (pid, tid); | |
4756 | break; | |
4757 | ||
4758 | case TTEVT_EXEC: | |
4759 | case TTEVT_FORK: | |
4760 | /* Expected "other" FORK or EXEC event from a | |
4761 | * fork or vfork. | |
4762 | */ | |
4763 | break; | |
4764 | ||
4765 | default: | |
4766 | printf ("Internal error: failed to handle event %s on process %d, thread %d.", | |
4767 | get_printable_name_of_ttrace_event ( | |
4768 | p->last_stop_state.tts_event), | |
4769 | p->pid, p->tid); | |
4770 | } | |
4771 | } | |
4772 | ||
4773 | add_thread (tid); /* in thread.c */ | |
c906108c | 4774 | } |
c5aa993b | 4775 | |
c906108c | 4776 | #ifdef PARANOIA |
c5aa993b JM |
4777 | if (debug_on) |
4778 | print_tthreads (); | |
c906108c SS |
4779 | #endif |
4780 | ||
4781 | /* One mustn't call ttrace_wait() after attaching via ttrace, | |
4782 | 'cause the process is stopped already. | |
c5aa993b | 4783 | |
c906108c SS |
4784 | However, the upper layers of gdb's execution control will |
4785 | want to wait after attaching (but not after forks, in | |
4786 | which case they will be doing a "target_resume", anticipating | |
4787 | a later TTEVT_EXEC or TTEVT_FORK event). | |
4788 | ||
4789 | To make this attach() implementation more compatible with | |
4790 | others, we'll make the attached-to process raise a SIGTRAP. | |
4791 | ||
4792 | Issue: this continues only one thread. That could be | |
4793 | dangerous if the thread is blocked--the process won't run | |
4794 | and no trap will be raised. FIX! (check state.tts_flags? | |
4795 | need one that's either TTS_WASRUNNING--but we've stopped | |
4796 | it and made it TTS_WASSUSPENDED. Hum...FIXME!) | |
4797 | */ | |
c5aa993b JM |
4798 | if (DO_ATTACH_CONTINUE == kind_of_go) |
4799 | { | |
4800 | tt_status = call_real_ttrace ( | |
4801 | TT_LWP_CONTINUE, | |
4802 | pid, | |
4803 | a_thread, | |
4804 | TT_USE_CURRENT_PC, | |
4805 | (TTRACE_ARG_TYPE) target_signal_to_host (TARGET_SIGNAL_TRAP), | |
4806 | TT_NIL); | |
c906108c | 4807 | if (errno) |
c5aa993b | 4808 | perror_with_name ("ttrace"); |
c906108c | 4809 | |
c5aa993b | 4810 | clear_handled (a_thread); /* So TRAP will be reported. */ |
c906108c SS |
4811 | |
4812 | /* Now running. | |
4813 | */ | |
4814 | process_state = RUNNING; | |
c5aa993b | 4815 | } |
c906108c SS |
4816 | |
4817 | attach_flag = 1; | |
4818 | } | |
4819 | #endif /* ATTACH_DETACH */ | |
c906108c | 4820 | \f |
c5aa993b | 4821 | |
c906108c SS |
4822 | #ifdef ATTACH_DETACH |
4823 | /* Start debugging the process whose number is PID. | |
4824 | * (A _real_ pid). | |
4825 | */ | |
4826 | int | |
fba45db2 | 4827 | attach (int pid) |
c906108c | 4828 | { |
c5aa993b JM |
4829 | int tt_status; |
4830 | ||
c906108c | 4831 | tt_status = call_real_ttrace ( |
c5aa993b JM |
4832 | TT_PROC_ATTACH, |
4833 | pid, | |
4834 | (lwpid_t) TT_NIL, | |
4835 | TT_NIL, | |
4836 | (TTRACE_ARG_TYPE) TT_VERSION, | |
4837 | TT_NIL); | |
c906108c SS |
4838 | if (errno) |
4839 | perror_with_name ("ttrace attach"); | |
4840 | ||
4841 | /* If successful, the process is now stopped. | |
4842 | */ | |
4843 | process_state = STOPPED; | |
4844 | ||
4845 | /* Our caller ("attach_command" in "infcmd.c") | |
4846 | * expects to do a "wait_for_inferior" after | |
4847 | * the attach, so make sure the inferior is | |
4848 | * running when we're done. | |
4849 | */ | |
c5aa993b | 4850 | update_thread_state_after_attach (pid, DO_ATTACH_CONTINUE); |
c906108c SS |
4851 | |
4852 | return pid; | |
4853 | } | |
4854 | ||
4855 | ||
4856 | #if defined(CHILD_POST_ATTACH) | |
4857 | void | |
fba45db2 | 4858 | child_post_attach (int pid) |
c906108c SS |
4859 | { |
4860 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4861 | if (debug_on) |
4862 | printf ("child-post-attach call\n"); | |
c906108c SS |
4863 | #endif |
4864 | ||
4865 | require_notification_of_events (pid); | |
4866 | } | |
4867 | #endif | |
4868 | ||
4869 | ||
4870 | /* Stop debugging the process whose number is PID | |
4871 | and continue it with signal number SIGNAL. | |
4872 | SIGNAL = 0 means just continue it. | |
4873 | */ | |
4874 | void | |
fba45db2 | 4875 | detach (int signal) |
c906108c SS |
4876 | { |
4877 | errno = 0; | |
4878 | call_ttrace (TT_PROC_DETACH, | |
c5aa993b JM |
4879 | inferior_pid, |
4880 | TT_NIL, | |
4881 | (TTRACE_ARG_TYPE) signal, | |
4882 | TT_NIL); | |
c906108c SS |
4883 | attach_flag = 0; |
4884 | ||
c5aa993b | 4885 | clear_thread_info (); |
c906108c SS |
4886 | |
4887 | /* Process-state? */ | |
4888 | } | |
4889 | #endif /* ATTACH_DETACH */ | |
c906108c | 4890 | \f |
c5aa993b | 4891 | |
c906108c SS |
4892 | /* Default the type of the ttrace transfer to int. */ |
4893 | #ifndef TTRACE_XFER_TYPE | |
4894 | #define TTRACE_XFER_TYPE int | |
4895 | #endif | |
4896 | ||
4897 | void | |
fba45db2 | 4898 | _initialize_kernel_u_addr (void) |
c906108c SS |
4899 | { |
4900 | } | |
4901 | ||
4902 | #if !defined (CHILD_XFER_MEMORY) | |
4903 | /* NOTE! I tried using TTRACE_READDATA, etc., to read and write memory | |
4904 | in the NEW_SUN_TTRACE case. | |
4905 | It ought to be straightforward. But it appears that writing did | |
4906 | not write the data that I specified. I cannot understand where | |
4907 | it got the data that it actually did write. */ | |
4908 | ||
4909 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
4910 | to debugger memory starting at MYADDR. Copy to inferior if | |
73186089 | 4911 | WRITE is nonzero. TARGET is ignored. |
c5aa993b | 4912 | |
c906108c SS |
4913 | Returns the length copied, which is either the LEN argument or zero. |
4914 | This xfer function does not do partial moves, since child_ops | |
4915 | doesn't allow memory operations to cross below us in the target stack | |
4916 | anyway. */ | |
4917 | ||
4918 | int | |
73186089 | 4919 | child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, |
043780a1 | 4920 | struct mem_attrib *attrib, |
73186089 | 4921 | struct target_ops *target) |
c906108c SS |
4922 | { |
4923 | register int i; | |
4924 | /* Round starting address down to longword boundary. */ | |
c5aa993b | 4925 | register CORE_ADDR addr = memaddr & -sizeof (TTRACE_XFER_TYPE); |
c906108c SS |
4926 | /* Round ending address up; get number of longwords that makes. */ |
4927 | register int count | |
c5aa993b JM |
4928 | = (((memaddr + len) - addr) + sizeof (TTRACE_XFER_TYPE) - 1) |
4929 | / sizeof (TTRACE_XFER_TYPE); | |
c906108c SS |
4930 | /* Allocate buffer of that many longwords. */ |
4931 | register TTRACE_XFER_TYPE *buffer | |
c5aa993b | 4932 | = (TTRACE_XFER_TYPE *) alloca (count * sizeof (TTRACE_XFER_TYPE)); |
c906108c SS |
4933 | |
4934 | if (write) | |
4935 | { | |
4936 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
4937 | ||
c5aa993b JM |
4938 | if (addr != memaddr || len < (int) sizeof (TTRACE_XFER_TYPE)) |
4939 | { | |
4940 | /* Need part of initial word -- fetch it. */ | |
4941 | buffer[0] = call_ttrace (TT_LWP_RDTEXT, | |
4942 | inferior_pid, | |
4943 | (TTRACE_ARG_TYPE) addr, | |
4944 | TT_NIL, | |
4945 | TT_NIL); | |
4946 | } | |
c906108c SS |
4947 | |
4948 | if (count > 1) /* FIXME, avoid if even boundary */ | |
4949 | { | |
4950 | buffer[count - 1] = call_ttrace (TT_LWP_RDTEXT, | |
c5aa993b JM |
4951 | inferior_pid, |
4952 | ((TTRACE_ARG_TYPE) | |
4953 | (addr + (count - 1) * sizeof (TTRACE_XFER_TYPE))), | |
4954 | TT_NIL, | |
4955 | TT_NIL); | |
c906108c SS |
4956 | } |
4957 | ||
4958 | /* Copy data to be written over corresponding part of buffer */ | |
4959 | ||
4960 | memcpy ((char *) buffer + (memaddr & (sizeof (TTRACE_XFER_TYPE) - 1)), | |
4961 | myaddr, | |
4962 | len); | |
4963 | ||
4964 | /* Write the entire buffer. */ | |
4965 | ||
4966 | for (i = 0; i < count; i++, addr += sizeof (TTRACE_XFER_TYPE)) | |
4967 | { | |
4968 | errno = 0; | |
4969 | call_ttrace (TT_LWP_WRDATA, | |
c5aa993b JM |
4970 | inferior_pid, |
4971 | (TTRACE_ARG_TYPE) addr, | |
4972 | (TTRACE_ARG_TYPE) buffer[i], | |
4973 | TT_NIL); | |
c906108c SS |
4974 | if (errno) |
4975 | { | |
4976 | /* Using the appropriate one (I or D) is necessary for | |
c5aa993b | 4977 | Gould NP1, at least. */ |
c906108c SS |
4978 | errno = 0; |
4979 | call_ttrace (TT_LWP_WRTEXT, | |
c5aa993b JM |
4980 | inferior_pid, |
4981 | (TTRACE_ARG_TYPE) addr, | |
4982 | (TTRACE_ARG_TYPE) buffer[i], | |
4983 | TT_NIL); | |
c906108c SS |
4984 | } |
4985 | if (errno) | |
4986 | return 0; | |
4987 | } | |
4988 | } | |
4989 | else | |
4990 | { | |
4991 | /* Read all the longwords */ | |
4992 | for (i = 0; i < count; i++, addr += sizeof (TTRACE_XFER_TYPE)) | |
4993 | { | |
4994 | errno = 0; | |
4995 | buffer[i] = call_ttrace (TT_LWP_RDTEXT, | |
c5aa993b JM |
4996 | inferior_pid, |
4997 | (TTRACE_ARG_TYPE) addr, | |
4998 | TT_NIL, | |
4999 | TT_NIL); | |
c906108c SS |
5000 | if (errno) |
5001 | return 0; | |
5002 | QUIT; | |
5003 | } | |
5004 | ||
5005 | /* Copy appropriate bytes out of the buffer. */ | |
5006 | memcpy (myaddr, | |
5007 | (char *) buffer + (memaddr & (sizeof (TTRACE_XFER_TYPE) - 1)), | |
5008 | len); | |
5009 | } | |
5010 | return len; | |
5011 | } | |
c906108c | 5012 | \f |
c5aa993b | 5013 | |
c906108c | 5014 | static void |
fba45db2 | 5015 | udot_info (void) |
c906108c | 5016 | { |
c5aa993b JM |
5017 | int udot_off; /* Offset into user struct */ |
5018 | int udot_val; /* Value from user struct at udot_off */ | |
5019 | char mess[128]; /* For messages */ | |
c906108c | 5020 | |
c5aa993b JM |
5021 | if (!target_has_execution) |
5022 | { | |
5023 | error ("The program is not being run."); | |
5024 | } | |
c906108c SS |
5025 | |
5026 | #if !defined (KERNEL_U_SIZE) | |
5027 | ||
5028 | /* Adding support for this command is easy. Typically you just add a | |
5029 | routine, called "kernel_u_size" that returns the size of the user | |
5030 | struct, to the appropriate *-nat.c file and then add to the native | |
5031 | config file "#define KERNEL_U_SIZE kernel_u_size()" */ | |
5032 | error ("Don't know how large ``struct user'' is in this version of gdb."); | |
5033 | ||
5034 | #else | |
5035 | ||
5036 | for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) | |
5037 | { | |
5038 | if ((udot_off % 24) == 0) | |
5039 | { | |
5040 | if (udot_off > 0) | |
5041 | { | |
5042 | printf_filtered ("\n"); | |
5043 | } | |
5044 | printf_filtered ("%04x:", udot_off); | |
5045 | } | |
5046 | udot_val = call_ttrace (TT_LWP_RUREGS, | |
c5aa993b JM |
5047 | inferior_pid, |
5048 | (TTRACE_ARG_TYPE) udot_off, | |
5049 | TT_NIL, | |
5050 | TT_NIL); | |
c906108c SS |
5051 | if (errno != 0) |
5052 | { | |
5053 | sprintf (mess, "\nreading user struct at offset 0x%x", udot_off); | |
5054 | perror_with_name (mess); | |
5055 | } | |
5056 | /* Avoid using nonportable (?) "*" in print specs */ | |
5057 | printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); | |
5058 | } | |
5059 | printf_filtered ("\n"); | |
5060 | ||
5061 | #endif | |
5062 | } | |
5063 | #endif /* !defined (CHILD_XFER_MEMORY). */ | |
5064 | ||
5065 | /* TTrace version of "target_pid_to_exec_file" | |
5066 | */ | |
5067 | char * | |
fba45db2 | 5068 | child_pid_to_exec_file (int tid) |
c906108c | 5069 | { |
c5aa993b JM |
5070 | static char exec_file_buffer[1024]; |
5071 | int tt_status; | |
5072 | CORE_ADDR top_of_stack; | |
5073 | char four_chars[4]; | |
5074 | int name_index; | |
5075 | int i; | |
5076 | int done; | |
5077 | int saved_inferior_pid; | |
5078 | ||
c906108c SS |
5079 | /* As of 10.x HP-UX, there's an explicit request to get the |
5080 | *pathname. | |
5081 | */ | |
5082 | tt_status = call_ttrace (TT_PROC_GET_PATHNAME, | |
c5aa993b JM |
5083 | tid, |
5084 | (TTRACE_ARG_TYPE) exec_file_buffer, | |
5085 | (TTRACE_ARG_TYPE) sizeof (exec_file_buffer) - 1, | |
5086 | TT_NIL); | |
c906108c SS |
5087 | if (tt_status >= 0) |
5088 | return exec_file_buffer; | |
5089 | ||
5090 | /* ??rehrauer: The above request may or may not be broken. It | |
5091 | doesn't seem to work when I use it. But, it may be designed | |
5092 | to only work immediately after an exec event occurs. (I'm | |
5093 | waiting for COSL to explain.) | |
5094 | ||
5095 | In any case, if it fails, try a really, truly amazingly gross | |
5096 | hack that DDE uses, of pawing through the process' data | |
5097 | segment to find the pathname. | |
c5aa993b | 5098 | */ |
104c1213 | 5099 | top_of_stack = (TARGET_PTR_BIT == 64 ? 0x800003ffff7f0000 : 0x7b03a000); |
c906108c SS |
5100 | name_index = 0; |
5101 | done = 0; | |
5102 | ||
5103 | /* On the chance that pid != inferior_pid, set inferior_pid | |
5104 | to pid, so that (grrrr!) implicit uses of inferior_pid get | |
5105 | the right id. | |
c5aa993b | 5106 | */ |
c906108c SS |
5107 | saved_inferior_pid = inferior_pid; |
5108 | inferior_pid = tid; | |
5109 | ||
5110 | /* Try to grab a null-terminated string. */ | |
c5aa993b JM |
5111 | while (!done) |
5112 | { | |
5113 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
5114 | { | |
5115 | inferior_pid = saved_inferior_pid; | |
5116 | return NULL; | |
5117 | } | |
5118 | for (i = 0; i < 4; i++) | |
5119 | { | |
5120 | exec_file_buffer[name_index++] = four_chars[i]; | |
5121 | done = (four_chars[i] == '\0'); | |
5122 | if (done) | |
5123 | break; | |
5124 | } | |
5125 | top_of_stack += 4; | |
5126 | } | |
c906108c SS |
5127 | |
5128 | if (exec_file_buffer[0] == '\0') | |
5129 | { | |
5130 | inferior_pid = saved_inferior_pid; | |
5131 | return NULL; | |
5132 | } | |
5133 | ||
5134 | inferior_pid = saved_inferior_pid; | |
5135 | return exec_file_buffer; | |
5136 | } | |
5137 | ||
5138 | ||
5139 | void | |
fba45db2 | 5140 | pre_fork_inferior (void) |
c906108c | 5141 | { |
c5aa993b | 5142 | int status; |
c906108c SS |
5143 | |
5144 | status = pipe (startup_semaphore.parent_channel); | |
c5aa993b JM |
5145 | if (status < 0) |
5146 | { | |
c906108c SS |
5147 | warning ("error getting parent pipe for startup semaphore"); |
5148 | return; | |
c5aa993b | 5149 | } |
c906108c SS |
5150 | |
5151 | status = pipe (startup_semaphore.child_channel); | |
c5aa993b JM |
5152 | if (status < 0) |
5153 | { | |
c906108c SS |
5154 | warning ("error getting child pipe for startup semaphore"); |
5155 | return; | |
c5aa993b | 5156 | } |
c906108c SS |
5157 | } |
5158 | ||
5159 | /* Called via #define REQUIRE_ATTACH from inftarg.c, | |
5160 | * ultimately from "follow_inferior_fork" in infrun.c, | |
5161 | * itself called from "resume". | |
5162 | * | |
5163 | * This seems to be intended to attach after a fork or | |
5164 | * vfork, while "attach" is used to attach to a pid | |
5165 | * given by the user. The check for an existing attach | |
5166 | * seems odd--it always fails in our test system. | |
5167 | */ | |
5168 | int | |
fba45db2 | 5169 | hppa_require_attach (int pid) |
c906108c | 5170 | { |
c5aa993b JM |
5171 | int tt_status; |
5172 | CORE_ADDR pc; | |
5173 | CORE_ADDR pc_addr; | |
5174 | unsigned int regs_offset; | |
c906108c | 5175 | process_state_t old_process_state = process_state; |
c5aa993b | 5176 | |
c906108c SS |
5177 | /* Are we already attached? There appears to be no explicit |
5178 | * way to answer this via ttrace, so we try something which | |
5179 | * should be innocuous if we are attached. If that fails, | |
5180 | * then we assume we're not attached, and so attempt to make | |
5181 | * it so. | |
5182 | */ | |
5183 | errno = 0; | |
5184 | tt_status = call_real_ttrace (TT_PROC_STOP, | |
c5aa993b JM |
5185 | pid, |
5186 | (lwpid_t) TT_NIL, | |
5187 | (TTRACE_ARG_TYPE) TT_NIL, | |
5188 | (TTRACE_ARG_TYPE) TT_NIL, | |
5189 | TT_NIL); | |
5190 | ||
c906108c SS |
5191 | if (errno) |
5192 | { | |
5193 | /* No change to process-state! | |
5194 | */ | |
5195 | errno = 0; | |
c5aa993b | 5196 | pid = attach (pid); |
c906108c SS |
5197 | } |
5198 | else | |
5199 | { | |
c5aa993b JM |
5200 | /* If successful, the process is now stopped. But if |
5201 | * we're VFORKING, the parent is still running, so don't | |
5202 | * change the process state. | |
5203 | */ | |
5204 | if (process_state != VFORKING) | |
5205 | process_state = STOPPED; | |
5206 | ||
5207 | /* If we were already attached, you'd think that we | |
5208 | * would need to start going again--but you'd be wrong, | |
5209 | * as the fork-following code is actually in the middle | |
5210 | * of the "resume" routine in in "infrun.c" and so | |
5211 | * will (almost) immediately do a resume. | |
5212 | * | |
5213 | * On the other hand, if we are VFORKING, which means | |
5214 | * that the child and the parent share a process for a | |
5215 | * while, we know that "resume" won't be resuming | |
5216 | * until the child EXEC event is seen. But we still | |
5217 | * don't want to continue, as the event is already | |
5218 | * there waiting. | |
5219 | */ | |
5220 | update_thread_state_after_attach (pid, DONT_ATTACH_CONTINUE); | |
5221 | } /* STOP succeeded */ | |
5222 | ||
c906108c SS |
5223 | return pid; |
5224 | } | |
5225 | ||
5226 | int | |
fba45db2 | 5227 | hppa_require_detach (int pid, int signal) |
c906108c | 5228 | { |
c5aa993b | 5229 | int tt_status; |
c906108c SS |
5230 | |
5231 | /* If signal is non-zero, we must pass the signal on to the active | |
5232 | thread prior to detaching. We do this by continuing the threads | |
5233 | with the signal. | |
5234 | */ | |
5235 | if (signal != 0) | |
5236 | { | |
5237 | errno = 0; | |
c5aa993b | 5238 | threads_continue_all_with_signals (pid, signal); |
c906108c SS |
5239 | } |
5240 | ||
5241 | errno = 0; | |
5242 | tt_status = call_ttrace (TT_PROC_DETACH, | |
c5aa993b JM |
5243 | pid, |
5244 | TT_NIL, | |
5245 | TT_NIL, | |
5246 | TT_NIL); | |
c906108c | 5247 | |
c5aa993b | 5248 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
5249 | |
5250 | /* process_state? */ | |
c5aa993b | 5251 | |
c906108c SS |
5252 | return pid; |
5253 | } | |
5254 | ||
5255 | /* Given the starting address of a memory page, hash it to a bucket in | |
5256 | the memory page dictionary. | |
c5aa993b | 5257 | */ |
c906108c | 5258 | static int |
fba45db2 | 5259 | get_dictionary_bucket_of_page (CORE_ADDR page_start) |
c906108c | 5260 | { |
c5aa993b | 5261 | int hash; |
c906108c SS |
5262 | |
5263 | hash = (page_start / memory_page_dictionary.page_size); | |
5264 | hash = hash % MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; | |
5265 | ||
5266 | return hash; | |
5267 | } | |
5268 | ||
5269 | ||
5270 | /* Given a memory page's starting address, get (i.e., find an existing | |
5271 | or create a new) dictionary entry for the page. The page will be | |
5272 | write-protected when this function returns, but may have a reference | |
5273 | count of 0 (if the page was newly-added to the dictionary). | |
c5aa993b | 5274 | */ |
c906108c | 5275 | static memory_page_t * |
fba45db2 | 5276 | get_dictionary_entry_of_page (int pid, CORE_ADDR page_start) |
c906108c | 5277 | { |
c5aa993b JM |
5278 | int bucket; |
5279 | memory_page_t *page = NULL; | |
5280 | memory_page_t *previous_page = NULL; | |
c906108c SS |
5281 | |
5282 | /* We're going to be using the dictionary now, than-kew. */ | |
3731b38a | 5283 | require_memory_page_dictionary (); |
c906108c SS |
5284 | |
5285 | /* Try to find an existing dictionary entry for this page. Hash | |
5286 | on the page's starting address. | |
c5aa993b | 5287 | */ |
c906108c SS |
5288 | bucket = get_dictionary_bucket_of_page (page_start); |
5289 | page = &memory_page_dictionary.buckets[bucket]; | |
5290 | while (page != NULL) | |
5291 | { | |
5292 | if (page->page_start == page_start) | |
c5aa993b | 5293 | break; |
c906108c SS |
5294 | previous_page = page; |
5295 | page = page->next; | |
5296 | } | |
5297 | ||
5298 | /* Did we find a dictionary entry for this page? If not, then | |
5299 | add it to the dictionary now. | |
c5aa993b | 5300 | */ |
c906108c SS |
5301 | if (page == NULL) |
5302 | { | |
5303 | /* Create a new entry. */ | |
5304 | page = (memory_page_t *) xmalloc (sizeof (memory_page_t)); | |
5305 | page->page_start = page_start; | |
5306 | page->reference_count = 0; | |
5307 | page->next = NULL; | |
5308 | page->previous = NULL; | |
5309 | ||
5310 | /* We'll write-protect the page now, if that's allowed. */ | |
5311 | page->original_permissions = write_protect_page (pid, page_start); | |
5312 | ||
5313 | /* Add the new entry to the dictionary. */ | |
5314 | page->previous = previous_page; | |
5315 | previous_page->next = page; | |
5316 | ||
5317 | memory_page_dictionary.page_count++; | |
5318 | } | |
5319 | ||
5320 | return page; | |
5321 | } | |
5322 | ||
5323 | ||
5324 | static void | |
fba45db2 | 5325 | remove_dictionary_entry_of_page (int pid, memory_page_t *page) |
c906108c SS |
5326 | { |
5327 | /* Restore the page's original permissions. */ | |
5328 | unwrite_protect_page (pid, page->page_start, page->original_permissions); | |
5329 | ||
5330 | /* Kick the page out of the dictionary. */ | |
5331 | if (page->previous != NULL) | |
5332 | page->previous->next = page->next; | |
5333 | if (page->next != NULL) | |
5334 | page->next->previous = page->previous; | |
5335 | ||
5336 | /* Just in case someone retains a handle to this after it's freed. */ | |
5337 | page->page_start = (CORE_ADDR) 0; | |
5338 | ||
5339 | memory_page_dictionary.page_count--; | |
5340 | ||
b8c9b27d | 5341 | xfree (page); |
c906108c SS |
5342 | } |
5343 | ||
5344 | ||
5345 | static void | |
fba45db2 | 5346 | hppa_enable_syscall_events (int pid) |
c906108c | 5347 | { |
c5aa993b JM |
5348 | int tt_status; |
5349 | ttevent_t ttrace_events; | |
c906108c SS |
5350 | |
5351 | /* Get the set of events that are currently enabled. */ | |
5352 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
5353 | pid, |
5354 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5355 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5356 | TT_NIL); | |
c906108c SS |
5357 | if (errno) |
5358 | perror_with_name ("ttrace"); | |
5359 | ||
5360 | /* Add syscall events to that set. */ | |
5361 | ttrace_events.tte_events |= TTEVT_SYSCALL_ENTRY; | |
5362 | ttrace_events.tte_events |= TTEVT_SYSCALL_RETURN; | |
5363 | ||
5364 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
5365 | pid, |
5366 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5367 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5368 | TT_NIL); | |
c906108c SS |
5369 | if (errno) |
5370 | perror_with_name ("ttrace"); | |
5371 | } | |
5372 | ||
5373 | ||
5374 | static void | |
fba45db2 | 5375 | hppa_disable_syscall_events (int pid) |
c906108c | 5376 | { |
c5aa993b JM |
5377 | int tt_status; |
5378 | ttevent_t ttrace_events; | |
c906108c SS |
5379 | |
5380 | /* Get the set of events that are currently enabled. */ | |
5381 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
5382 | pid, |
5383 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5384 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5385 | TT_NIL); | |
c906108c SS |
5386 | if (errno) |
5387 | perror_with_name ("ttrace"); | |
5388 | ||
5389 | /* Remove syscall events from that set. */ | |
5390 | ttrace_events.tte_events &= ~TTEVT_SYSCALL_ENTRY; | |
5391 | ttrace_events.tte_events &= ~TTEVT_SYSCALL_RETURN; | |
5392 | ||
5393 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
5394 | pid, |
5395 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5396 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5397 | TT_NIL); | |
c906108c SS |
5398 | if (errno) |
5399 | perror_with_name ("ttrace"); | |
5400 | } | |
5401 | ||
5402 | ||
5403 | /* The address range beginning with START and ending with START+LEN-1 | |
5404 | (inclusive) is to be watched via page-protection by a new watchpoint. | |
5405 | Set protection for all pages that overlap that range. | |
5406 | ||
5407 | Note that our caller sets TYPE to: | |
c5aa993b JM |
5408 | 0 for a bp_hardware_watchpoint, |
5409 | 1 for a bp_read_watchpoint, | |
5410 | 2 for a bp_access_watchpoint | |
c906108c SS |
5411 | |
5412 | (Yes, this is intentionally (though lord only knows why) different | |
5413 | from the TYPE that is passed to hppa_remove_hw_watchpoint.) | |
c5aa993b | 5414 | */ |
c906108c | 5415 | int |
fba45db2 | 5416 | hppa_insert_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, int type) |
c906108c | 5417 | { |
c5aa993b JM |
5418 | CORE_ADDR page_start; |
5419 | int dictionary_was_empty; | |
5420 | int page_size; | |
5421 | int page_id; | |
5422 | LONGEST range_size_in_pages; | |
c906108c SS |
5423 | |
5424 | if (type != 0) | |
5425 | error ("read or access hardware watchpoints not supported on HP-UX"); | |
5426 | ||
5427 | /* Examine all pages in the address range. */ | |
5428 | require_memory_page_dictionary (); | |
5429 | ||
5430 | dictionary_was_empty = (memory_page_dictionary.page_count == (LONGEST) 0); | |
5431 | ||
5432 | page_size = memory_page_dictionary.page_size; | |
5433 | page_start = (start / page_size) * page_size; | |
5434 | range_size_in_pages = ((LONGEST) len + (LONGEST) page_size - 1) / (LONGEST) page_size; | |
5435 | ||
c5aa993b | 5436 | for (page_id = 0; page_id < range_size_in_pages; page_id++, page_start += page_size) |
c906108c | 5437 | { |
c5aa993b | 5438 | memory_page_t *page; |
c906108c SS |
5439 | |
5440 | /* This gets the page entered into the dictionary if it was | |
5441 | not already entered. | |
c5aa993b | 5442 | */ |
c906108c SS |
5443 | page = get_dictionary_entry_of_page (pid, page_start); |
5444 | page->reference_count++; | |
5445 | } | |
5446 | ||
5447 | /* Our implementation depends on seeing calls to kernel code, for the | |
5448 | following reason. Here we ask to be notified of syscalls. | |
5449 | ||
5450 | When a protected page is accessed by user code, HP-UX raises a SIGBUS. | |
5451 | Fine. | |
5452 | ||
5453 | But when kernel code accesses the page, it doesn't give a SIGBUS. | |
5454 | Rather, the system call that touched the page fails, with errno=EFAULT. | |
5455 | Not good for us. | |
5456 | ||
5457 | We could accomodate this "feature" by asking to be notified of syscall | |
5458 | entries & exits; upon getting an entry event, disabling page-protections; | |
5459 | upon getting an exit event, reenabling page-protections and then checking | |
5460 | if any watchpoints triggered. | |
5461 | ||
5462 | However, this turns out to be a real performance loser. syscalls are | |
5463 | usually a frequent occurrence. Having to unprotect-reprotect all watched | |
5464 | pages, and also to then read all watched memory locations and compare for | |
5465 | triggers, can be quite expensive. | |
5466 | ||
5467 | Instead, we'll only ask to be notified of syscall exits. When we get | |
5468 | one, we'll check whether errno is set. If not, or if it's not EFAULT, | |
5469 | we can just continue the inferior. | |
5470 | ||
5471 | If errno is set upon syscall exit to EFAULT, we must perform some fairly | |
5472 | hackish stuff to determine whether the failure really was due to a | |
5473 | page-protect trap on a watched location. | |
c5aa993b | 5474 | */ |
c906108c SS |
5475 | if (dictionary_was_empty) |
5476 | hppa_enable_syscall_events (pid); | |
5477 | ||
5478 | return 1; | |
5479 | } | |
5480 | ||
5481 | ||
5482 | /* The address range beginning with START and ending with START+LEN-1 | |
5483 | (inclusive) was being watched via page-protection by a watchpoint | |
5484 | which has been removed. Remove protection for all pages that | |
5485 | overlap that range, which are not also being watched by other | |
5486 | watchpoints. | |
c5aa993b | 5487 | */ |
c906108c | 5488 | int |
fba45db2 KB |
5489 | hppa_remove_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len, |
5490 | enum bptype type) | |
c906108c | 5491 | { |
c5aa993b JM |
5492 | CORE_ADDR page_start; |
5493 | int dictionary_is_empty; | |
5494 | int page_size; | |
5495 | int page_id; | |
5496 | LONGEST range_size_in_pages; | |
c906108c SS |
5497 | |
5498 | if (type != 0) | |
5499 | error ("read or access hardware watchpoints not supported on HP-UX"); | |
5500 | ||
5501 | /* Examine all pages in the address range. */ | |
5502 | require_memory_page_dictionary (); | |
5503 | ||
5504 | page_size = memory_page_dictionary.page_size; | |
5505 | page_start = (start / page_size) * page_size; | |
5506 | range_size_in_pages = ((LONGEST) len + (LONGEST) page_size - 1) / (LONGEST) page_size; | |
5507 | ||
c5aa993b | 5508 | for (page_id = 0; page_id < range_size_in_pages; page_id++, page_start += page_size) |
c906108c | 5509 | { |
c5aa993b | 5510 | memory_page_t *page; |
c906108c SS |
5511 | |
5512 | page = get_dictionary_entry_of_page (pid, page_start); | |
5513 | page->reference_count--; | |
5514 | ||
5515 | /* Was this the last reference of this page? If so, then we | |
5516 | must scrub the entry from the dictionary, and also restore | |
5517 | the page's original permissions. | |
c5aa993b | 5518 | */ |
c906108c | 5519 | if (page->reference_count == 0) |
c5aa993b | 5520 | remove_dictionary_entry_of_page (pid, page); |
c906108c SS |
5521 | } |
5522 | ||
5523 | dictionary_is_empty = (memory_page_dictionary.page_count == (LONGEST) 0); | |
5524 | ||
5525 | /* If write protections are currently disallowed, then that implies that | |
5526 | wait_for_inferior believes that the inferior is within a system call. | |
5527 | Since we want to see both syscall entry and return, it's clearly not | |
5528 | good to disable syscall events in this state! | |
5529 | ||
5530 | ??rehrauer: Yeah, it'd be better if we had a specific flag that said, | |
5531 | "inferior is between syscall events now". Oh well. | |
c5aa993b | 5532 | */ |
c906108c SS |
5533 | if (dictionary_is_empty && memory_page_dictionary.page_protections_allowed) |
5534 | hppa_disable_syscall_events (pid); | |
5535 | ||
5536 | return 1; | |
5537 | } | |
5538 | ||
5539 | ||
5540 | /* Could we implement a watchpoint of this type via our available | |
5541 | hardware support? | |
5542 | ||
5543 | This query does not consider whether a particular address range | |
5544 | could be so watched, but just whether support is generally available | |
5545 | for such things. See hppa_range_profitable_for_hw_watchpoint for a | |
5546 | query that answers whether a particular range should be watched via | |
5547 | hardware support. | |
c5aa993b | 5548 | */ |
c906108c | 5549 | int |
fba45db2 | 5550 | hppa_can_use_hw_watchpoint (enum bptype type, int cnt, enum bptype ot) |
c906108c SS |
5551 | { |
5552 | return (type == bp_hardware_watchpoint); | |
5553 | } | |
5554 | ||
5555 | ||
5556 | /* Assuming we could set a hardware watchpoint on this address, do | |
5557 | we think it would be profitable ("a good idea") to do so? If not, | |
5558 | we can always set a regular (aka single-step & test) watchpoint | |
5559 | on the address... | |
c5aa993b | 5560 | */ |
c906108c | 5561 | int |
fba45db2 | 5562 | hppa_range_profitable_for_hw_watchpoint (int pid, CORE_ADDR start, LONGEST len) |
c906108c | 5563 | { |
c5aa993b JM |
5564 | int range_is_stack_based; |
5565 | int range_is_accessible; | |
5566 | CORE_ADDR page_start; | |
5567 | int page_size; | |
5568 | int page; | |
5569 | LONGEST range_size_in_pages; | |
c906108c SS |
5570 | |
5571 | /* ??rehrauer: For now, say that all addresses are potentially | |
5572 | profitable. Possibly later we'll want to test the address | |
5573 | for "stackness"? | |
c5aa993b | 5574 | */ |
c906108c SS |
5575 | range_is_stack_based = 0; |
5576 | ||
5577 | /* If any page in the range is inaccessible, then we cannot | |
5578 | really use hardware watchpointing, even though our client | |
5579 | thinks we can. In that case, it's actually an error to | |
5580 | attempt to use hw watchpoints, so we'll tell our client | |
5581 | that the range is "unprofitable", and hope that they listen... | |
c5aa993b JM |
5582 | */ |
5583 | range_is_accessible = 1; /* Until proven otherwise. */ | |
c906108c SS |
5584 | |
5585 | /* Examine all pages in the address range. */ | |
5586 | errno = 0; | |
5587 | page_size = sysconf (_SC_PAGE_SIZE); | |
5588 | ||
5589 | /* If we can't determine page size, we're hosed. Tell our | |
5590 | client it's unprofitable to use hw watchpoints for this | |
5591 | range. | |
c5aa993b | 5592 | */ |
c906108c SS |
5593 | if (errno || (page_size <= 0)) |
5594 | { | |
5595 | errno = 0; | |
5596 | return 0; | |
5597 | } | |
5598 | ||
5599 | page_start = (start / page_size) * page_size; | |
c5aa993b | 5600 | range_size_in_pages = len / (LONGEST) page_size; |
c906108c | 5601 | |
c5aa993b | 5602 | for (page = 0; page < range_size_in_pages; page++, page_start += page_size) |
c906108c | 5603 | { |
c5aa993b JM |
5604 | int tt_status; |
5605 | int page_permissions; | |
c906108c SS |
5606 | |
5607 | /* Is this page accessible? */ | |
5608 | errno = 0; | |
5609 | tt_status = call_ttrace (TT_PROC_GET_MPROTECT, | |
c5aa993b JM |
5610 | pid, |
5611 | (TTRACE_ARG_TYPE) page_start, | |
5612 | TT_NIL, | |
5613 | (TTRACE_ARG_TYPE) & page_permissions); | |
c906108c | 5614 | if (errno || (tt_status < 0)) |
c5aa993b JM |
5615 | { |
5616 | errno = 0; | |
5617 | range_is_accessible = 0; | |
5618 | break; | |
5619 | } | |
c906108c SS |
5620 | |
5621 | /* Yes, go for another... */ | |
5622 | } | |
5623 | ||
c5aa993b | 5624 | return (!range_is_stack_based && range_is_accessible); |
c906108c SS |
5625 | } |
5626 | ||
5627 | ||
5628 | char * | |
fba45db2 | 5629 | hppa_pid_or_tid_to_str (pid_t id) |
c906108c | 5630 | { |
c5aa993b | 5631 | static char buf[100]; /* Static because address returned. */ |
c906108c SS |
5632 | |
5633 | /* Does this appear to be a process? If so, print it that way. */ | |
5634 | if (is_process_id (id)) | |
ed9a39eb | 5635 | return child_pid_to_str (id); |
c906108c SS |
5636 | |
5637 | /* Else, print both the GDB thread number and the system thread id. */ | |
5638 | sprintf (buf, "thread %d (", pid_to_thread_id (id)); | |
5639 | strcat (buf, hppa_tid_to_str (id)); | |
5640 | strcat (buf, ")\0"); | |
5641 | ||
5642 | return buf; | |
5643 | } | |
c906108c | 5644 | \f |
c5aa993b | 5645 | |
c906108c SS |
5646 | /* If the current pid is not the pid this module reported |
5647 | * from "ptrace_wait" with the most recent event, then the | |
5648 | * user has switched threads. | |
5649 | * | |
5650 | * If the last reported event was a breakpoint, then return | |
5651 | * the old thread id, else return 0. | |
5652 | */ | |
c5aa993b | 5653 | pid_t |
fba45db2 | 5654 | hppa_switched_threads (pid_t gdb_pid) |
c906108c | 5655 | { |
c5aa993b JM |
5656 | if (gdb_pid == old_gdb_pid) |
5657 | { | |
c906108c SS |
5658 | /* |
5659 | * Core gdb is working with the same pid that it | |
5660 | * was before we reported the last event. This | |
5661 | * is ok: e.g. we reported hitting a thread-specific | |
5662 | * breakpoint, but we were reporting the wrong | |
5663 | * thread, so the core just ignored the event. | |
5664 | * | |
5665 | * No thread switch has happened. | |
5666 | */ | |
5667 | return (pid_t) 0; | |
c5aa993b JM |
5668 | } |
5669 | else if (gdb_pid == reported_pid) | |
5670 | { | |
c906108c SS |
5671 | /* |
5672 | * Core gdb is working with the pid we reported, so | |
5673 | * any continue or step will be able to figure out | |
5674 | * that it needs to step over any hit breakpoints | |
5675 | * without our (i.e. PREPARE_TO_PROCEED's) help. | |
5676 | */ | |
5677 | return (pid_t) 0; | |
c5aa993b JM |
5678 | } |
5679 | else if (!reported_bpt) | |
5680 | { | |
5681 | /* | |
5682 | * The core switched, but we didn't just report a | |
5683 | * breakpoint, so there's no just-hit breakpoint | |
5684 | * instruction at "reported_pid"'s PC, and thus there | |
5685 | * is no need to step over it. | |
5686 | */ | |
c906108c | 5687 | return (pid_t) 0; |
c5aa993b JM |
5688 | } |
5689 | else | |
5690 | { | |
5691 | /* There's been a real switch, and we reported | |
5692 | * a hit breakpoint. Let "hppa_prepare_to_proceed" | |
5693 | * know, so it can see whether the breakpoint is | |
5694 | * still active. | |
5695 | */ | |
5696 | return reported_pid; | |
5697 | } | |
c906108c SS |
5698 | |
5699 | /* Keep compiler happy with an obvious return at the end. | |
5700 | */ | |
c5aa993b | 5701 | return (pid_t) 0; |
c906108c SS |
5702 | } |
5703 | ||
5704 | void | |
fba45db2 | 5705 | hppa_ensure_vforking_parent_remains_stopped (int pid) |
c906108c SS |
5706 | { |
5707 | /* Nothing to do when using ttrace. Only the ptrace-based implementation | |
5708 | must do real work. | |
5709 | */ | |
5710 | } | |
5711 | ||
5712 | ||
5713 | int | |
fba45db2 | 5714 | hppa_resume_execd_vforking_child_to_get_parent_vfork (void) |
c906108c | 5715 | { |
c5aa993b | 5716 | return 0; /* No, the parent vfork is available now. */ |
c906108c | 5717 | } |
c5aa993b | 5718 | \f |
c906108c | 5719 | |
7be570e7 JM |
5720 | /* Write a register as a 64bit value. This may be necessary if the |
5721 | native OS is too braindamaged to allow some (or all) registers to | |
5722 | be written in 32bit hunks such as hpux11 and the PC queue registers. | |
5723 | ||
5724 | This is horribly gross and disgusting. */ | |
5725 | ||
5726 | int | |
fba45db2 | 5727 | ttrace_write_reg_64 (int gdb_tid, CORE_ADDR dest_addr, CORE_ADDR src_addr) |
7be570e7 JM |
5728 | { |
5729 | pid_t pid; | |
5730 | lwpid_t tid; | |
5731 | int tt_status; | |
5732 | ||
5733 | tid = map_from_gdb_tid (gdb_tid); | |
5734 | pid = get_pid_for (tid); | |
5735 | ||
5736 | errno = 0; | |
5737 | tt_status = ttrace (TT_LWP_WUREGS, | |
5738 | pid, | |
5739 | tid, | |
5740 | (TTRACE_ARG_TYPE) dest_addr, | |
5741 | 8, | |
5742 | (TTRACE_ARG_TYPE) src_addr ); | |
5743 | ||
5744 | #ifdef THREAD_DEBUG | |
5745 | if (errno) | |
5746 | { | |
5747 | /* Don't bother for a known benign error: if you ask for the | |
5748 | first thread state, but there is only one thread and it's | |
5749 | not stopped, ttrace complains. | |
5750 | ||
5751 | We have this inside the #ifdef because our caller will do | |
5752 | this check for real. */ | |
5753 | if( request != TT_PROC_GET_FIRST_LWP_STATE | |
5754 | || errno != EPROTO ) | |
5755 | { | |
5756 | if( debug_on ) | |
5757 | printf( "TT fail for %s, with pid %d, tid %d, status %d \n", | |
5758 | get_printable_name_of_ttrace_request (TT_LWP_WUREGS), | |
5759 | pid, tid, tt_status ); | |
5760 | } | |
5761 | } | |
5762 | #endif | |
5763 | ||
5764 | return tt_status; | |
5765 | } | |
c906108c | 5766 | |
c906108c | 5767 | void |
fba45db2 | 5768 | _initialize_infttrace (void) |
c906108c SS |
5769 | { |
5770 | /* Initialize the ttrace-based hardware watchpoint implementation. */ | |
c5aa993b | 5771 | memory_page_dictionary.page_count = (LONGEST) - 1; |
c906108c SS |
5772 | memory_page_dictionary.page_protections_allowed = 1; |
5773 | ||
5774 | errno = 0; | |
5775 | memory_page_dictionary.page_size = sysconf (_SC_PAGE_SIZE); | |
5776 | ||
a0b3c4fd JM |
5777 | /* We do a lot of casts from pointers to TTRACE_ARG_TYPE; make sure |
5778 | this is okay. */ | |
5779 | if (sizeof (TTRACE_ARG_TYPE) < sizeof (void *)) | |
e1e9e218 | 5780 | internal_error (__FILE__, __LINE__, "failed internal consistency check"); |
a0b3c4fd | 5781 | |
c906108c SS |
5782 | if (errno || (memory_page_dictionary.page_size <= 0)) |
5783 | perror_with_name ("sysconf"); | |
5784 | } |