]>
Commit | Line | Data |
---|---|---|
c906108c SS |
1 | /* Low level Unix child interface to ttrace, for GDB when running under HP-UX. |
2 | Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 | |
3 | Free Software Foundation, Inc. | |
4 | ||
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "target.h" | |
26 | #include "gdb_string.h" | |
27 | #include "wait.h" | |
28 | #include "command.h" | |
29 | ||
30 | /* Some hackery to work around a use of the #define name NO_FLAGS | |
31 | * in both gdb and HPUX (bfd.h and /usr/include/machine/vmparam.h). | |
32 | */ | |
33 | #ifdef NO_FLAGS | |
34 | #define INFTTRACE_TEMP_HACK NO_FLAGS | |
35 | #undef NO_FLAGS | |
36 | #endif | |
37 | ||
38 | #ifdef USG | |
39 | #include <sys/types.h> | |
40 | #endif | |
41 | ||
42 | #include <sys/param.h> | |
43 | #include <sys/dir.h> | |
44 | #include <signal.h> | |
45 | #include <sys/ioctl.h> | |
46 | ||
47 | #include <sys/ttrace.h> | |
48 | #ifdef HAVE_UNISTD_H | |
49 | #include <unistd.h> | |
50 | #endif | |
51 | #include <sys/mman.h> | |
52 | ||
53 | #ifndef NO_PTRACE_H | |
54 | #ifdef PTRACE_IN_WRONG_PLACE | |
55 | #include <ptrace.h> | |
56 | #else | |
57 | #include <sys/ptrace.h> | |
58 | #endif | |
59 | #endif /* NO_PTRACE_H */ | |
60 | ||
61 | /* Second half of the hackery above. Non-ANSI C, so | |
62 | * we can't use "#error", alas. | |
63 | */ | |
64 | #ifdef NO_FLAGS | |
65 | #if (NO_FLAGS != INFTTRACE_TEMP_HACK ) | |
66 | /* #error "Hackery to remove warning didn't work right" */ | |
67 | #else | |
68 | /* Ok, new def'n of NO_FLAGS is same as old one; no action needed. */ | |
69 | #endif | |
70 | #else | |
71 | /* #error "Didn't get expected re-definition of NO_FLAGS" */ | |
72 | #define NO_FLAGS INFTTRACE_TEMP_HACK | |
73 | #endif | |
74 | ||
75 | #if !defined (PT_SETTRC) | |
76 | #define PT_SETTRC 0 /* Make process traceable by parent */ | |
77 | #endif | |
78 | #if !defined (PT_READ_I) | |
79 | #define PT_READ_I 1 /* Read word from text space */ | |
80 | #endif | |
81 | #if !defined (PT_READ_D) | |
82 | #define PT_READ_D 2 /* Read word from data space */ | |
83 | #endif | |
84 | #if !defined (PT_READ_U) | |
85 | #define PT_READ_U 3 /* Read word from kernel user struct */ | |
86 | #endif | |
87 | #if !defined (PT_WRITE_I) | |
88 | #define PT_WRITE_I 4 /* Write word to text space */ | |
89 | #endif | |
90 | #if !defined (PT_WRITE_D) | |
91 | #define PT_WRITE_D 5 /* Write word to data space */ | |
92 | #endif | |
93 | #if !defined (PT_WRITE_U) | |
94 | #define PT_WRITE_U 6 /* Write word to kernel user struct */ | |
95 | #endif | |
96 | #if !defined (PT_CONTINUE) | |
97 | #define PT_CONTINUE 7 /* Continue after signal */ | |
98 | #endif | |
99 | #if !defined (PT_STEP) | |
100 | #define PT_STEP 9 /* Set flag for single stepping */ | |
101 | #endif | |
102 | #if !defined (PT_KILL) | |
103 | #define PT_KILL 8 /* Send child a SIGKILL signal */ | |
104 | #endif | |
105 | ||
106 | #ifndef PT_ATTACH | |
107 | #define PT_ATTACH PTRACE_ATTACH | |
108 | #endif | |
109 | #ifndef PT_DETACH | |
110 | #define PT_DETACH PTRACE_DETACH | |
111 | #endif | |
112 | ||
113 | #include "gdbcore.h" | |
114 | #ifndef NO_SYS_FILE | |
115 | #include <sys/file.h> | |
116 | #endif | |
117 | ||
118 | /* This semaphore is used to coordinate the child and parent processes | |
119 | after a fork(), and before an exec() by the child. See parent_attach_all | |
120 | for details. | |
c5aa993b JM |
121 | */ |
122 | typedef struct | |
123 | { | |
124 | int parent_channel[2]; /* Parent "talks" to [1], child "listens" to [0] */ | |
125 | int child_channel[2]; /* Child "talks" to [1], parent "listens" to [0] */ | |
126 | } | |
127 | startup_semaphore_t; | |
c906108c SS |
128 | |
129 | #define SEM_TALK (1) | |
130 | #define SEM_LISTEN (0) | |
131 | ||
c5aa993b | 132 | static startup_semaphore_t startup_semaphore; |
c906108c SS |
133 | |
134 | /* See can_touch_threads_of_process for details. */ | |
c5aa993b JM |
135 | static int vforking_child_pid = 0; |
136 | static int vfork_in_flight = 0; | |
c906108c SS |
137 | |
138 | /* To support PREPARE_TO_PROCEED (hppa_prepare_to_proceed). | |
139 | */ | |
c5aa993b | 140 | static pid_t old_gdb_pid = 0; |
c906108c SS |
141 | static pid_t reported_pid = 0; |
142 | static int reported_bpt = 0; | |
143 | ||
144 | /* 1 if ok as results of a ttrace or ttrace_wait call, 0 otherwise. | |
145 | */ | |
146 | #define TT_OK( _status, _errno ) \ | |
147 | (((_status) == 1) && ((_errno) == 0)) | |
148 | ||
149 | #define TTRACE_ARG_TYPE uint64_t | |
150 | ||
151 | /* When supplied as the "addr" operand, ttrace interprets this | |
152 | to mean, "from the current address". | |
c5aa993b | 153 | */ |
c906108c SS |
154 | #define TT_USE_CURRENT_PC ((TTRACE_ARG_TYPE) TT_NOPC) |
155 | ||
156 | /* When supplied as the "addr", "data" or "addr2" operand for most | |
157 | requests, ttrace interprets this to mean, "pay no heed to this | |
158 | argument". | |
c5aa993b | 159 | */ |
c906108c SS |
160 | #define TT_NIL ((TTRACE_ARG_TYPE) TT_NULLARG) |
161 | ||
162 | /* This is capable of holding the value of a 32-bit register. The | |
163 | value is always left-aligned in the buffer; i.e., [0] contains | |
164 | the most-significant byte of the register's value, and [sizeof(reg)] | |
165 | contains the least-significant value. | |
166 | ||
167 | ??rehrauer: Yes, this assumes that an int is 32-bits on HP-UX, and | |
168 | that registers are 32-bits on HP-UX. The latter assumption changes | |
169 | with PA2.0. | |
c5aa993b JM |
170 | */ |
171 | typedef int register_value_t; | |
c906108c SS |
172 | |
173 | /******************************************************************** | |
174 | ||
175 | How this works: | |
176 | ||
177 | 1. Thread numbers | |
178 | ||
179 | The rest of GDB sees threads as being things with different | |
180 | "pid" (process id) values. See "thread.c" for details. The | |
181 | separate threads will be seen and reacted to if infttrace passes | |
182 | back different pid values (for _events_). See wait_for_inferior | |
183 | in inftarg.c. | |
184 | ||
185 | So infttrace is going to use thread ids externally, pretending | |
186 | they are process ids, and keep track internally so that it can | |
187 | use the real process id (and thread id) when calling ttrace. | |
188 | ||
189 | The data structure that supports this is a linked list of the | |
190 | current threads. Since at some date infttrace will have to | |
191 | deal with multiple processes, each list element records its | |
192 | corresponding pid, rather than having a single global. | |
193 | ||
194 | Note that the list is only approximately current; that's ok, as | |
195 | it's up to date when we need it (we hope!). Also, it can contain | |
196 | dead threads, as there's no harm if it does. | |
197 | ||
198 | The approach taken here is to bury the translation from external | |
199 | to internal inside "call_ttrace" and a few other places. | |
200 | ||
201 | There are some wrinkles: | |
202 | ||
203 | o When GDB forks itself to create the debug target process, | |
204 | there's only a pid of 0 around in the child, so the | |
205 | TT_PROC_SETTRC operation uses a more direct call to ttrace; | |
206 | Similiarly, the initial setting of the event mask happens | |
207 | early as well, and so is also special-cased, and an attach | |
208 | uses a real pid; | |
209 | ||
210 | o We define an unthreaded application as having a "pseudo" | |
211 | thread; | |
212 | ||
213 | o To keep from confusing the rest of GDB, we don't switch | |
214 | the PID for the pseudo thread to a TID. A table will help: | |
215 | ||
216 | Rest of GDB sees these PIDs: pid tid1 tid2 tid3 ... | |
217 | ||
218 | Our thread list stores: pid pid pid pid ... | |
219 | tid0 tid1 tid2 tid3 | |
220 | ||
221 | Ttrace sees these TIDS: tid0 tid1 tid2 tid3 ... | |
222 | ||
223 | Both pid and tid0 will map to tid0, as there are infttrace.c-internal | |
224 | calls to ttrace using tid0. | |
225 | ||
226 | 2. Step and Continue | |
227 | ||
228 | Since we're implementing the "stop the world" model, sub-model | |
229 | "other threads run during step", we have some stuff to do: | |
230 | ||
231 | o User steps require continuing all threads other than the | |
232 | one the user is stepping; | |
233 | ||
234 | o Internal debugger steps (such as over a breakpoint or watchpoint, | |
235 | but not out of a library load thunk) require stepping only | |
236 | the selected thread; this means that we have to report the | |
237 | step finish on that thread, which can lead to complications; | |
238 | ||
239 | o When a thread is created, it is created running, rather | |
240 | than stopped--so we have to stop it. | |
241 | ||
242 | The OS doesn't guarantee the stopped thread list will be stable, | |
243 | no does it guarantee where on the stopped thread list a thread | |
244 | that is single-stepped will wind up: it's possible that it will | |
245 | be off the list for a while, it's possible the step will complete | |
246 | and it will be re-posted to the end... | |
247 | ||
248 | This means we have to scan the stopped thread list, build up | |
249 | a work-list, and then run down the work list; we can't do the | |
250 | step/continue during the scan. | |
251 | ||
252 | 3. Buffering events | |
253 | ||
254 | Then there's the issue of waiting for an event. We do this by | |
255 | noticing how many events are reported at the end of each wait. | |
256 | From then on, we "fake" all resumes and steps, returning instantly, | |
257 | and don't do another wait. Once all pending events are reported, | |
258 | we can really resume again. | |
259 | ||
260 | To keep this hidden, all the routines which know about tids and | |
261 | pids or real events and simulated ones are static (file-local). | |
262 | ||
263 | This code can make lots of calls to ttrace, in particular it | |
264 | can spin down the list of thread states more than once. If this | |
265 | becomes a performance hit, the spin could be done once and the | |
266 | various "tsp" blocks saved, keeping all later spins in this | |
267 | process. | |
268 | ||
269 | The O/S doesn't promise to keep the list straight, and so we must | |
270 | re-scan a lot. By observation, it looks like a single-step/wait | |
271 | puts the stepped thread at the end of the list but doesn't change | |
272 | it otherwise. | |
273 | ||
274 | **************************************************************** | |
275 | */ | |
276 | ||
277 | /* Uncomment these to turn on various debugging output */ | |
278 | /* #define THREAD_DEBUG */ | |
279 | /* #define WAIT_BUFFER_DEBUG */ | |
280 | /* #define PARANOIA */ | |
281 | ||
282 | ||
283 | #define INFTTRACE_ALL_THREADS (-1) | |
284 | #define INFTTRACE_STEP (1) | |
285 | #define INFTTRACE_CONTINUE (0) | |
286 | ||
287 | /* FIX: this is used in inftarg.c/child_wait, in a hack. | |
288 | */ | |
289 | extern int not_same_real_pid; | |
290 | ||
291 | /* This is used to count buffered events. | |
292 | */ | |
293 | static unsigned int more_events_left = 0; | |
294 | ||
295 | /* Process state. | |
296 | */ | |
c5aa993b JM |
297 | typedef enum process_state_enum |
298 | { | |
c906108c SS |
299 | STOPPED, |
300 | FAKE_STEPPING, | |
c5aa993b | 301 | FAKE_CONTINUE, /* For later use */ |
c906108c SS |
302 | RUNNING, |
303 | FORKING, | |
304 | VFORKING | |
c5aa993b JM |
305 | } |
306 | process_state_t; | |
c906108c SS |
307 | |
308 | static process_state_t process_state = STOPPED; | |
309 | ||
310 | /* User-specified stepping modality. | |
311 | */ | |
c5aa993b JM |
312 | typedef enum stepping_mode_enum |
313 | { | |
314 | DO_DEFAULT, /* ...which is a continue! */ | |
c906108c SS |
315 | DO_STEP, |
316 | DO_CONTINUE | |
c5aa993b JM |
317 | } |
318 | stepping_mode_t; | |
319 | ||
c906108c SS |
320 | /* Action to take on an attach, depends on |
321 | * what kind (user command, fork, vfork). | |
322 | * | |
323 | * At the moment, this is either: | |
324 | * | |
325 | * o continue with a SIGTRAP signal, or | |
326 | * | |
327 | * o leave stopped. | |
328 | */ | |
c5aa993b JM |
329 | typedef enum attach_continue_enum |
330 | { | |
331 | DO_ATTACH_CONTINUE, | |
332 | DONT_ATTACH_CONTINUE | |
333 | } | |
334 | attach_continue_t; | |
c906108c SS |
335 | |
336 | /* This flag is true if we are doing a step-over-bpt | |
337 | * with buffered events. We will have to be sure to | |
338 | * report the right thread, as otherwise the spaghetti | |
339 | * code in "infrun.c/wait_for_inferior" will get | |
340 | * confused. | |
341 | */ | |
c5aa993b JM |
342 | static int doing_fake_step = 0; |
343 | static lwpid_t fake_step_tid = 0; | |
c906108c | 344 | \f |
c5aa993b | 345 | |
c906108c SS |
346 | /**************************************************** |
347 | * Thread information structure routines and types. * | |
348 | **************************************************** | |
349 | */ | |
c5aa993b | 350 | typedef |
c906108c | 351 | struct thread_info_struct |
c5aa993b JM |
352 | { |
353 | int am_pseudo; /* This is a pseudo-thread for the process. */ | |
354 | int pid; /* Process ID */ | |
355 | lwpid_t tid; /* Thread ID */ | |
356 | int handled; /* 1 if a buffered event was handled. */ | |
357 | int seen; /* 1 if this thread was seen on a traverse. */ | |
358 | int terminated; /* 1 if thread has terminated. */ | |
359 | int have_signal; /* 1 if signal to be sent */ | |
360 | enum target_signal signal_value; /* Signal to send */ | |
361 | int have_start; /* 1 if alternate starting address */ | |
362 | stepping_mode_t stepping_mode; /* Whether to step or continue */ | |
363 | CORE_ADDR start; /* Where to start */ | |
364 | int have_state; /* 1 if the event state has been set */ | |
365 | ttstate_t last_stop_state; /* The most recently-waited event for this thread. */ | |
c906108c | 366 | struct thread_info_struct |
c5aa993b | 367 | *next; /* All threads are linked via this field. */ |
c906108c | 368 | struct thread_info_struct |
c5aa993b JM |
369 | *next_pseudo; /* All pseudo-threads are linked via this field. */ |
370 | } | |
371 | thread_info; | |
c906108c SS |
372 | |
373 | typedef | |
374 | struct thread_info_header_struct | |
c5aa993b JM |
375 | { |
376 | int count; | |
c906108c SS |
377 | thread_info *head; |
378 | thread_info *head_pseudo; | |
c906108c | 379 | |
c5aa993b JM |
380 | } |
381 | thread_info_header; | |
c906108c | 382 | |
c5aa993b JM |
383 | static thread_info_header thread_head = |
384 | {0, NULL, NULL}; | |
385 | static thread_info_header deleted_threads = | |
386 | {0, NULL, NULL}; | |
c906108c | 387 | |
c5aa993b | 388 | static saved_real_pid = 0; |
c906108c | 389 | \f |
c5aa993b | 390 | |
c906108c SS |
391 | /************************************************* |
392 | * Debugging support functions * | |
393 | ************************************************* | |
394 | */ | |
395 | CORE_ADDR | |
c5aa993b JM |
396 | get_raw_pc (ttid) |
397 | lwpid_t ttid; | |
c906108c | 398 | { |
c5aa993b JM |
399 | unsigned long pc_val; |
400 | int offset; | |
401 | int res; | |
402 | ||
403 | offset = register_addr (PC_REGNUM, U_REGS_OFFSET); | |
404 | res = read_from_register_save_state ( | |
405 | ttid, | |
406 | (TTRACE_ARG_TYPE) offset, | |
407 | (char *) &pc_val, | |
408 | sizeof (pc_val)); | |
409 | if (res <= 0) | |
410 | { | |
411 | return (CORE_ADDR) pc_val; | |
412 | } | |
413 | else | |
414 | { | |
415 | return (CORE_ADDR) 0; | |
416 | } | |
417 | } | |
c906108c SS |
418 | |
419 | static char * | |
c5aa993b JM |
420 | get_printable_name_of_stepping_mode (mode) |
421 | stepping_mode_t mode; | |
c906108c | 422 | { |
c5aa993b JM |
423 | switch (mode) |
424 | { | |
425 | case DO_DEFAULT: | |
426 | return "DO_DEFAULT"; | |
427 | case DO_STEP: | |
428 | return "DO_STEP"; | |
429 | case DO_CONTINUE: | |
430 | return "DO_CONTINUE"; | |
431 | default: | |
432 | return "?unknown mode?"; | |
433 | } | |
c906108c SS |
434 | } |
435 | ||
436 | /* This function returns a pointer to a string describing the | |
437 | * ttrace event being reported. | |
438 | */ | |
439 | char * | |
440 | get_printable_name_of_ttrace_event (event) | |
c5aa993b | 441 | ttevents_t event; |
c906108c SS |
442 | { |
443 | /* This enumeration is "gappy", so don't use a table. */ | |
c5aa993b JM |
444 | switch (event) |
445 | { | |
c906108c SS |
446 | |
447 | case TTEVT_NONE: | |
c5aa993b | 448 | return "TTEVT_NONE"; |
c906108c | 449 | case TTEVT_SIGNAL: |
c5aa993b | 450 | return "TTEVT_SIGNAL"; |
c906108c | 451 | case TTEVT_FORK: |
c5aa993b | 452 | return "TTEVT_FORK"; |
c906108c | 453 | case TTEVT_EXEC: |
c5aa993b | 454 | return "TTEVT_EXEC"; |
c906108c | 455 | case TTEVT_EXIT: |
c5aa993b | 456 | return "TTEVT_EXIT"; |
c906108c | 457 | case TTEVT_VFORK: |
c5aa993b | 458 | return "TTEVT_VFORK"; |
c906108c | 459 | case TTEVT_SYSCALL_RETURN: |
c5aa993b | 460 | return "TTEVT_SYSCALL_RETURN"; |
c906108c | 461 | case TTEVT_LWP_CREATE: |
c5aa993b | 462 | return "TTEVT_LWP_CREATE"; |
c906108c | 463 | case TTEVT_LWP_TERMINATE: |
c5aa993b | 464 | return "TTEVT_LWP_TERMINATE"; |
c906108c | 465 | case TTEVT_LWP_EXIT: |
c5aa993b | 466 | return "TTEVT_LWP_EXIT"; |
c906108c | 467 | case TTEVT_LWP_ABORT_SYSCALL: |
c5aa993b | 468 | return "TTEVT_LWP_ABORT_SYSCALL"; |
c906108c | 469 | case TTEVT_SYSCALL_ENTRY: |
c5aa993b JM |
470 | return "TTEVT_SYSCALL_ENTRY"; |
471 | case TTEVT_SYSCALL_RESTART: | |
472 | return "TTEVT_SYSCALL_RESTART"; | |
473 | default: | |
c906108c | 474 | return "?new event?"; |
c5aa993b | 475 | } |
c906108c | 476 | } |
c906108c | 477 | \f |
c5aa993b | 478 | |
c906108c SS |
479 | /* This function translates the ttrace request enumeration into |
480 | * a character string that is its printable (aka "human readable") | |
481 | * name. | |
482 | */ | |
483 | char * | |
484 | get_printable_name_of_ttrace_request (request) | |
c5aa993b | 485 | ttreq_t request; |
c906108c SS |
486 | { |
487 | if (!IS_TTRACE_REQ (request)) | |
488 | return "?bad req?"; | |
489 | ||
490 | /* This enumeration is "gappy", so don't use a table. */ | |
c5aa993b JM |
491 | switch (request) |
492 | { | |
493 | case TT_PROC_SETTRC: | |
c906108c | 494 | return "TT_PROC_SETTRC"; |
c5aa993b | 495 | case TT_PROC_ATTACH: |
c906108c | 496 | return "TT_PROC_ATTACH"; |
c5aa993b | 497 | case TT_PROC_DETACH: |
c906108c | 498 | return "TT_PROC_DETACH"; |
c5aa993b | 499 | case TT_PROC_RDTEXT: |
c906108c | 500 | return "TT_PROC_RDTEXT"; |
c5aa993b | 501 | case TT_PROC_WRTEXT: |
c906108c | 502 | return "TT_PROC_WRTEXT"; |
c5aa993b | 503 | case TT_PROC_RDDATA: |
c906108c | 504 | return "TT_PROC_RDDATA"; |
c5aa993b | 505 | case TT_PROC_WRDATA: |
c906108c | 506 | return "TT_PROC_WRDATA"; |
c5aa993b | 507 | case TT_PROC_STOP: |
c906108c | 508 | return "TT_PROC_STOP"; |
c5aa993b | 509 | case TT_PROC_CONTINUE: |
c906108c | 510 | return "TT_PROC_CONTINUE"; |
c5aa993b | 511 | case TT_PROC_GET_PATHNAME: |
c906108c | 512 | return "TT_PROC_GET_PATHNAME"; |
c5aa993b | 513 | case TT_PROC_GET_EVENT_MASK: |
c906108c | 514 | return "TT_PROC_GET_EVENT_MASK"; |
c5aa993b | 515 | case TT_PROC_SET_EVENT_MASK: |
c906108c | 516 | return "TT_PROC_SET_EVENT_MASK"; |
c5aa993b | 517 | case TT_PROC_GET_FIRST_LWP_STATE: |
c906108c | 518 | return "TT_PROC_GET_FIRST_LWP_STATE"; |
c5aa993b | 519 | case TT_PROC_GET_NEXT_LWP_STATE: |
c906108c | 520 | return "TT_PROC_GET_NEXT_LWP_STATE"; |
c5aa993b | 521 | case TT_PROC_EXIT: |
c906108c | 522 | return "TT_PROC_EXIT"; |
c5aa993b | 523 | case TT_PROC_GET_MPROTECT: |
c906108c | 524 | return "TT_PROC_GET_MPROTECT"; |
c5aa993b | 525 | case TT_PROC_SET_MPROTECT: |
c906108c | 526 | return "TT_PROC_SET_MPROTECT"; |
c5aa993b | 527 | case TT_PROC_SET_SCBM: |
c906108c | 528 | return "TT_PROC_SET_SCBM"; |
c5aa993b | 529 | case TT_LWP_STOP: |
c906108c | 530 | return "TT_LWP_STOP"; |
c5aa993b | 531 | case TT_LWP_CONTINUE: |
c906108c | 532 | return "TT_LWP_CONTINUE"; |
c5aa993b | 533 | case TT_LWP_SINGLE: |
c906108c | 534 | return "TT_LWP_SINGLE"; |
c5aa993b | 535 | case TT_LWP_RUREGS: |
c906108c | 536 | return "TT_LWP_RUREGS"; |
c5aa993b | 537 | case TT_LWP_WUREGS: |
c906108c | 538 | return "TT_LWP_WUREGS"; |
c5aa993b | 539 | case TT_LWP_GET_EVENT_MASK: |
c906108c | 540 | return "TT_LWP_GET_EVENT_MASK"; |
c5aa993b | 541 | case TT_LWP_SET_EVENT_MASK: |
c906108c | 542 | return "TT_LWP_SET_EVENT_MASK"; |
c5aa993b | 543 | case TT_LWP_GET_STATE: |
c906108c | 544 | return "TT_LWP_GET_STATE"; |
c5aa993b | 545 | default: |
c906108c | 546 | return "?new req?"; |
c5aa993b | 547 | } |
c906108c | 548 | } |
c906108c | 549 | \f |
c5aa993b | 550 | |
c906108c SS |
551 | /* This function translates the process state enumeration into |
552 | * a character string that is its printable (aka "human readable") | |
553 | * name. | |
554 | */ | |
555 | static char * | |
556 | get_printable_name_of_process_state (process_state) | |
c5aa993b | 557 | process_state_t process_state; |
c906108c | 558 | { |
c5aa993b JM |
559 | switch (process_state) |
560 | { | |
c906108c SS |
561 | case STOPPED: |
562 | return "STOPPED"; | |
563 | case FAKE_STEPPING: | |
564 | return "FAKE_STEPPING"; | |
565 | case RUNNING: | |
566 | return "RUNNING"; | |
567 | case FORKING: | |
568 | return "FORKING"; | |
569 | case VFORKING: | |
570 | return "VFORKING"; | |
571 | default: | |
572 | return "?some unknown state?"; | |
c5aa993b | 573 | } |
c906108c SS |
574 | } |
575 | ||
576 | /* Set a ttrace thread state to a safe, initial state. | |
577 | */ | |
578 | static void | |
579 | clear_ttstate_t (tts) | |
c5aa993b | 580 | ttstate_t *tts; |
c906108c | 581 | { |
c5aa993b JM |
582 | tts->tts_pid = 0; |
583 | tts->tts_lwpid = 0; | |
584 | tts->tts_user_tid = 0; | |
585 | tts->tts_event = TTEVT_NONE; | |
c906108c SS |
586 | } |
587 | ||
588 | /* Copy ttrace thread state TTS_FROM into TTS_TO. | |
589 | */ | |
590 | static void | |
591 | copy_ttstate_t (tts_to, tts_from) | |
c5aa993b JM |
592 | ttstate_t *tts_to; |
593 | ttstate_t *tts_from; | |
c906108c | 594 | { |
c5aa993b | 595 | memcpy ((char *) tts_to, (char *) tts_from, sizeof (*tts_to)); |
c906108c SS |
596 | } |
597 | ||
598 | /* Are there any live threads we know about? | |
599 | */ | |
c5aa993b JM |
600 | static int |
601 | any_thread_records () | |
c906108c | 602 | { |
c5aa993b | 603 | return (thread_head.count > 0); |
c906108c SS |
604 | } |
605 | ||
606 | /* Create, fill in and link in a thread descriptor. | |
607 | */ | |
608 | static thread_info * | |
609 | create_thread_info (pid, tid) | |
c5aa993b JM |
610 | int pid; |
611 | lwpid_t tid; | |
c906108c | 612 | { |
c5aa993b JM |
613 | thread_info *new_p; |
614 | thread_info *p; | |
615 | int thread_count_of_pid; | |
616 | ||
617 | new_p = malloc (sizeof (thread_info)); | |
618 | new_p->pid = pid; | |
619 | new_p->tid = tid; | |
620 | new_p->have_signal = 0; | |
621 | new_p->have_start = 0; | |
622 | new_p->have_state = 0; | |
623 | clear_ttstate_t (&new_p->last_stop_state); | |
624 | new_p->am_pseudo = 0; | |
625 | new_p->handled = 0; | |
626 | new_p->seen = 0; | |
627 | new_p->terminated = 0; | |
628 | new_p->next = NULL; | |
629 | new_p->next_pseudo = NULL; | |
630 | new_p->stepping_mode = DO_DEFAULT; | |
631 | ||
632 | if (0 == thread_head.count) | |
633 | { | |
c906108c | 634 | #ifdef THREAD_DEBUG |
c5aa993b JM |
635 | if (debug_on) |
636 | printf ("First thread, pid %d tid %d!\n", pid, tid); | |
c906108c | 637 | #endif |
c5aa993b | 638 | saved_real_pid = inferior_pid; |
c906108c | 639 | } |
c5aa993b JM |
640 | else |
641 | { | |
c906108c | 642 | #ifdef THREAD_DEBUG |
c5aa993b JM |
643 | if (debug_on) |
644 | printf ("Subsequent thread, pid %d tid %d\n", pid, tid); | |
c906108c SS |
645 | #endif |
646 | } | |
647 | ||
c5aa993b JM |
648 | /* Another day, another thread... |
649 | */ | |
650 | thread_head.count++; | |
c906108c | 651 | |
c5aa993b JM |
652 | /* The new thread always goes at the head of the list. |
653 | */ | |
654 | new_p->next = thread_head.head; | |
655 | thread_head.head = new_p; | |
c906108c | 656 | |
c5aa993b JM |
657 | /* Is this the "pseudo" thread of a process? It is if there's |
658 | * no other thread for this process on the list. (Note that this | |
659 | * accomodates multiple processes, such as we see even for simple | |
660 | * cases like forking "non-threaded" programs.) | |
661 | */ | |
662 | p = thread_head.head; | |
663 | thread_count_of_pid = 0; | |
664 | while (p) | |
665 | { | |
666 | if (p->pid == new_p->pid) | |
667 | thread_count_of_pid++; | |
668 | p = p->next; | |
669 | } | |
670 | ||
671 | /* Did we see any other threads for this pid? (Recall that we just | |
672 | * added this thread to the list...) | |
673 | */ | |
674 | if (thread_count_of_pid == 1) | |
675 | { | |
676 | new_p->am_pseudo = 1; | |
677 | new_p->next_pseudo = thread_head.head_pseudo; | |
678 | thread_head.head_pseudo = new_p; | |
679 | } | |
680 | ||
681 | return new_p; | |
c906108c SS |
682 | } |
683 | ||
684 | /* Get rid of our thread info. | |
685 | */ | |
686 | static void | |
687 | clear_thread_info () | |
688 | { | |
c5aa993b JM |
689 | thread_info *p; |
690 | thread_info *q; | |
c906108c SS |
691 | |
692 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
693 | if (debug_on) |
694 | printf ("Clearing all thread info\n"); | |
c906108c SS |
695 | #endif |
696 | ||
c5aa993b JM |
697 | p = thread_head.head; |
698 | while (p) | |
699 | { | |
700 | q = p; | |
701 | p = p->next; | |
702 | free (q); | |
c906108c SS |
703 | } |
704 | ||
c5aa993b JM |
705 | thread_head.head = NULL; |
706 | thread_head.head_pseudo = NULL; | |
707 | thread_head.count = 0; | |
c906108c | 708 | |
c5aa993b JM |
709 | p = deleted_threads.head; |
710 | while (p) | |
711 | { | |
712 | q = p; | |
713 | p = p->next; | |
714 | free (q); | |
c906108c SS |
715 | } |
716 | ||
c5aa993b JM |
717 | deleted_threads.head = NULL; |
718 | deleted_threads.head_pseudo = NULL; | |
719 | deleted_threads.count = 0; | |
c906108c | 720 | |
c5aa993b JM |
721 | /* No threads, so can't have pending events. |
722 | */ | |
723 | more_events_left = 0; | |
c906108c SS |
724 | } |
725 | ||
726 | /* Given a tid, find the thread block for it. | |
727 | */ | |
728 | static thread_info * | |
729 | find_thread_info (tid) | |
c5aa993b | 730 | lwpid_t tid; |
c906108c | 731 | { |
c5aa993b | 732 | thread_info *p; |
c906108c | 733 | |
c5aa993b JM |
734 | for (p = thread_head.head; p; p = p->next) |
735 | { | |
736 | if (p->tid == tid) | |
737 | { | |
738 | return p; | |
739 | } | |
c906108c SS |
740 | } |
741 | ||
c5aa993b JM |
742 | for (p = deleted_threads.head; p; p = p->next) |
743 | { | |
744 | if (p->tid == tid) | |
745 | { | |
746 | return p; | |
747 | } | |
c906108c | 748 | } |
c5aa993b JM |
749 | |
750 | return NULL; | |
c906108c SS |
751 | } |
752 | ||
753 | /* For any but the pseudo thread, this maps to the | |
754 | * thread ID. For the pseudo thread, if you pass either | |
755 | * the thread id or the PID, you get the pseudo thread ID. | |
756 | * | |
757 | * We have to be prepared for core gdb to ask about | |
758 | * deleted threads. We do the map, but we don't like it. | |
759 | */ | |
760 | static lwpid_t | |
c5aa993b JM |
761 | map_from_gdb_tid (gdb_tid) |
762 | lwpid_t gdb_tid; | |
c906108c | 763 | { |
c5aa993b | 764 | thread_info *p; |
c906108c | 765 | |
c5aa993b JM |
766 | /* First assume gdb_tid really is a tid, and try to find a |
767 | * matching entry on the threads list. | |
768 | */ | |
769 | for (p = thread_head.head; p; p = p->next) | |
770 | { | |
771 | if (p->tid == gdb_tid) | |
772 | return gdb_tid; | |
c906108c SS |
773 | } |
774 | ||
c5aa993b JM |
775 | /* It doesn't appear to be a tid; perhaps it's really a pid? |
776 | * Try to find a "pseudo" thread entry on the threads list. | |
777 | */ | |
778 | for (p = thread_head.head_pseudo; p != NULL; p = p->next_pseudo) | |
779 | { | |
780 | if (p->pid == gdb_tid) | |
781 | return p->tid; | |
c906108c SS |
782 | } |
783 | ||
c5aa993b JM |
784 | /* Perhaps it's the tid of a deleted thread we may still |
785 | * have some knowledge of? | |
786 | */ | |
787 | for (p = deleted_threads.head; p; p = p->next) | |
788 | { | |
789 | if (p->tid == gdb_tid) | |
790 | return gdb_tid; | |
791 | } | |
c906108c | 792 | |
c5aa993b JM |
793 | /* Or perhaps it's the pid of a deleted process we may still |
794 | * have knowledge of? | |
795 | */ | |
796 | for (p = deleted_threads.head_pseudo; p != NULL; p = p->next_pseudo) | |
797 | { | |
798 | if (p->pid == gdb_tid) | |
799 | return p->tid; | |
800 | } | |
801 | ||
802 | return 0; /* Error? */ | |
c906108c SS |
803 | } |
804 | ||
805 | /* Map the other way: from a real tid to the | |
806 | * "pid" known by core gdb. This tid may be | |
807 | * for a thread that just got deleted, so we | |
808 | * also need to consider deleted threads. | |
809 | */ | |
810 | static lwpid_t | |
c5aa993b JM |
811 | map_to_gdb_tid (real_tid) |
812 | lwpid_t real_tid; | |
c906108c | 813 | { |
c5aa993b | 814 | thread_info *p; |
c906108c | 815 | |
c5aa993b JM |
816 | for (p = thread_head.head; p; p = p->next) |
817 | { | |
818 | if (p->tid == real_tid) | |
819 | { | |
820 | if (p->am_pseudo) | |
821 | return p->pid; | |
822 | else | |
823 | return real_tid; | |
824 | } | |
c906108c SS |
825 | } |
826 | ||
c5aa993b JM |
827 | for (p = deleted_threads.head; p; p = p->next) |
828 | { | |
829 | if (p->tid == real_tid) | |
830 | if (p->am_pseudo) | |
831 | return p->pid; /* Error? */ | |
832 | else | |
833 | return real_tid; | |
c906108c SS |
834 | } |
835 | ||
c5aa993b | 836 | return 0; /* Error? Never heard of this thread! */ |
c906108c SS |
837 | } |
838 | ||
839 | /* Do any threads have saved signals? | |
840 | */ | |
c5aa993b | 841 | static int |
c906108c SS |
842 | saved_signals_exist () |
843 | { | |
c5aa993b JM |
844 | thread_info *p; |
845 | ||
846 | for (p = thread_head.head; p; p = p->next) | |
847 | { | |
848 | if (p->have_signal) | |
849 | { | |
850 | return 1; | |
851 | } | |
c906108c SS |
852 | } |
853 | ||
c5aa993b | 854 | return 0; |
c906108c SS |
855 | } |
856 | ||
857 | /* Is this the tid for the zero-th thread? | |
858 | */ | |
c5aa993b | 859 | static int |
c906108c | 860 | is_pseudo_thread (tid) |
c5aa993b | 861 | lwpid_t tid; |
c906108c | 862 | { |
c5aa993b JM |
863 | thread_info *p = find_thread_info (tid); |
864 | if (NULL == p || p->terminated) | |
865 | return 0; | |
866 | else | |
867 | return p->am_pseudo; | |
c906108c SS |
868 | } |
869 | ||
870 | /* Is this thread terminated? | |
871 | */ | |
c5aa993b | 872 | static int |
c906108c | 873 | is_terminated (tid) |
c5aa993b | 874 | lwpid_t tid; |
c906108c | 875 | { |
c5aa993b | 876 | thread_info *p = find_thread_info (tid); |
c906108c | 877 | |
c5aa993b JM |
878 | if (NULL != p) |
879 | return p->terminated; | |
c906108c | 880 | |
c5aa993b | 881 | return 0; |
c906108c SS |
882 | } |
883 | ||
884 | /* Is this pid a real PID or a TID? | |
885 | */ | |
c5aa993b | 886 | static int |
c906108c | 887 | is_process_id (pid) |
c5aa993b | 888 | int pid; |
c906108c | 889 | { |
c5aa993b JM |
890 | lwpid_t tid; |
891 | thread_info *tinfo; | |
892 | pid_t this_pid; | |
893 | int this_pid_count; | |
c906108c SS |
894 | |
895 | /* What does PID really represent? | |
896 | */ | |
897 | tid = map_from_gdb_tid (pid); | |
898 | if (tid <= 0) | |
c5aa993b | 899 | return 0; /* Actually, is probably an error... */ |
c906108c SS |
900 | |
901 | tinfo = find_thread_info (tid); | |
902 | ||
903 | /* Does it appear to be a true thread? | |
904 | */ | |
c5aa993b | 905 | if (!tinfo->am_pseudo) |
c906108c SS |
906 | return 0; |
907 | ||
908 | /* Else, it looks like it may be a process. See if there's any other | |
909 | * threads with the same process ID, though. If there are, then TID | |
910 | * just happens to be the first thread of several for this process. | |
911 | */ | |
912 | this_pid = tinfo->pid; | |
913 | this_pid_count = 0; | |
914 | for (tinfo = thread_head.head; tinfo; tinfo = tinfo->next) | |
915 | { | |
916 | if (tinfo->pid == this_pid) | |
c5aa993b | 917 | this_pid_count++; |
c906108c SS |
918 | } |
919 | ||
920 | return (this_pid_count == 1); | |
921 | } | |
922 | ||
923 | ||
924 | /* Add a thread to our info. Prevent duplicate entries. | |
925 | */ | |
926 | static thread_info * | |
927 | add_tthread (pid, tid) | |
c5aa993b JM |
928 | int pid; |
929 | lwpid_t tid; | |
c906108c | 930 | { |
c5aa993b | 931 | thread_info *p; |
c906108c | 932 | |
c5aa993b JM |
933 | p = find_thread_info (tid); |
934 | if (NULL == p) | |
935 | p = create_thread_info (pid, tid); | |
c906108c | 936 | |
c5aa993b | 937 | return p; |
c906108c SS |
938 | } |
939 | ||
940 | /* Notice that a thread was deleted. | |
941 | */ | |
942 | static void | |
943 | del_tthread (tid) | |
c5aa993b | 944 | lwpid_t tid; |
c906108c | 945 | { |
c5aa993b JM |
946 | thread_info *p; |
947 | thread_info *chase; | |
c906108c | 948 | |
c5aa993b JM |
949 | if (thread_head.count <= 0) |
950 | { | |
951 | error ("Internal error in thread database."); | |
952 | return; | |
c906108c SS |
953 | } |
954 | ||
c5aa993b JM |
955 | chase = NULL; |
956 | for (p = thread_head.head; p; p = p->next) | |
957 | { | |
958 | if (p->tid == tid) | |
959 | { | |
c906108c SS |
960 | |
961 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
962 | if (debug_on) |
963 | printf ("Delete here: %d \n", tid); | |
c906108c SS |
964 | #endif |
965 | ||
c5aa993b JM |
966 | if (p->am_pseudo) |
967 | { | |
968 | /* | |
969 | * Deleting a main thread is ok if we're doing | |
970 | * a parent-follow on a child; this is odd but | |
971 | * not wrong. It apparently _doesn't_ happen | |
972 | * on the child-follow, as we don't just delete | |
973 | * the pseudo while keeping the rest of the | |
974 | * threads around--instead, we clear out the whole | |
975 | * thread list at once. | |
976 | */ | |
977 | thread_info *q; | |
978 | thread_info *q_chase; | |
979 | ||
980 | q_chase = NULL; | |
981 | for (q = thread_head.head_pseudo; q; q = q->next) | |
982 | { | |
983 | if (q == p) | |
984 | { | |
985 | /* Remove from pseudo list. | |
986 | */ | |
987 | if (q_chase == NULL) | |
988 | thread_head.head_pseudo = p->next_pseudo; | |
989 | else | |
990 | q_chase->next = p->next_pseudo; | |
991 | } | |
992 | else | |
993 | q_chase = q; | |
994 | } | |
995 | } | |
996 | ||
997 | /* Remove from live list. | |
998 | */ | |
999 | thread_head.count--; | |
1000 | ||
1001 | if (NULL == chase) | |
1002 | thread_head.head = p->next; | |
1003 | else | |
1004 | chase->next = p->next; | |
1005 | ||
1006 | /* Add to deleted thread list. | |
1007 | */ | |
1008 | p->next = deleted_threads.head; | |
1009 | deleted_threads.head = p; | |
1010 | deleted_threads.count++; | |
1011 | if (p->am_pseudo) | |
1012 | { | |
1013 | p->next_pseudo = deleted_threads.head_pseudo; | |
1014 | deleted_threads.head_pseudo = p; | |
1015 | } | |
1016 | p->terminated = 1; | |
1017 | ||
1018 | return; | |
1019 | } | |
1020 | ||
1021 | else | |
1022 | chase = p; | |
c906108c SS |
1023 | } |
1024 | } | |
1025 | ||
1026 | /* Get the pid for this tid. (Has to be a real TID!). | |
1027 | */ | |
1028 | static int | |
1029 | get_pid_for (tid) | |
c5aa993b | 1030 | lwpid_t tid; |
c906108c | 1031 | { |
c5aa993b | 1032 | thread_info *p; |
c906108c | 1033 | |
c5aa993b JM |
1034 | for (p = thread_head.head; p; p = p->next) |
1035 | { | |
1036 | if (p->tid == tid) | |
1037 | { | |
1038 | return p->pid; | |
1039 | } | |
c906108c SS |
1040 | } |
1041 | ||
c5aa993b JM |
1042 | for (p = deleted_threads.head; p; p = p->next) |
1043 | { | |
1044 | if (p->tid == tid) | |
1045 | { | |
1046 | return p->pid; | |
1047 | } | |
c906108c | 1048 | } |
c5aa993b JM |
1049 | |
1050 | return 0; | |
c906108c SS |
1051 | } |
1052 | ||
1053 | /* Note that this thread's current event has been handled. | |
1054 | */ | |
1055 | static void | |
c5aa993b JM |
1056 | set_handled (pid, tid) |
1057 | int pid; | |
1058 | lwpid_t tid; | |
c906108c | 1059 | { |
c5aa993b JM |
1060 | thread_info *p; |
1061 | ||
1062 | p = find_thread_info (tid); | |
1063 | if (NULL == p) | |
1064 | p = add_tthread (pid, tid); | |
c906108c | 1065 | |
c5aa993b | 1066 | p->handled = 1; |
c906108c SS |
1067 | } |
1068 | ||
1069 | /* Was this thread's current event handled? | |
1070 | */ | |
c5aa993b JM |
1071 | static int |
1072 | was_handled (tid) | |
1073 | lwpid_t tid; | |
c906108c | 1074 | { |
c5aa993b JM |
1075 | thread_info *p; |
1076 | ||
1077 | p = find_thread_info (tid); | |
1078 | if (NULL != p) | |
1079 | return p->handled; | |
c906108c | 1080 | |
c5aa993b | 1081 | return 0; /* New threads have not been handled */ |
c906108c SS |
1082 | } |
1083 | ||
1084 | /* Set this thread to unhandled. | |
1085 | */ | |
1086 | static void | |
c5aa993b JM |
1087 | clear_handled (tid) |
1088 | lwpid_t tid; | |
c906108c | 1089 | { |
c5aa993b JM |
1090 | thread_info *p; |
1091 | ||
c906108c | 1092 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1093 | if (debug_on) |
1094 | printf ("clear_handled %d\n", (int) tid); | |
c906108c SS |
1095 | #endif |
1096 | ||
1097 | p = find_thread_info (tid); | |
1098 | if (p == NULL) | |
1099 | error ("Internal error: No thread state to clear?"); | |
1100 | ||
1101 | p->handled = 0; | |
1102 | } | |
1103 | ||
1104 | /* Set all threads to unhandled. | |
1105 | */ | |
1106 | static void | |
1107 | clear_all_handled () | |
1108 | { | |
c5aa993b | 1109 | thread_info *p; |
c906108c SS |
1110 | |
1111 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
1112 | if (debug_on) |
1113 | printf ("clear_all_handled\n"); | |
c906108c SS |
1114 | #endif |
1115 | ||
c5aa993b JM |
1116 | for (p = thread_head.head; p; p = p->next) |
1117 | { | |
1118 | p->handled = 0; | |
c906108c SS |
1119 | } |
1120 | ||
c5aa993b JM |
1121 | for (p = deleted_threads.head; p; p = p->next) |
1122 | { | |
1123 | p->handled = 0; | |
c906108c SS |
1124 | } |
1125 | } | |
1126 | ||
1127 | /* Set this thread to default stepping mode. | |
1128 | */ | |
1129 | static void | |
c5aa993b JM |
1130 | clear_stepping_mode (tid) |
1131 | lwpid_t tid; | |
c906108c | 1132 | { |
c5aa993b JM |
1133 | thread_info *p; |
1134 | ||
c906108c | 1135 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1136 | if (debug_on) |
1137 | printf ("clear_stepping_mode %d\n", (int) tid); | |
c906108c SS |
1138 | #endif |
1139 | ||
1140 | p = find_thread_info (tid); | |
1141 | if (p == NULL) | |
1142 | error ("Internal error: No thread state to clear?"); | |
1143 | ||
1144 | p->stepping_mode = DO_DEFAULT; | |
1145 | } | |
1146 | ||
1147 | /* Set all threads to do default continue on resume. | |
1148 | */ | |
1149 | static void | |
1150 | clear_all_stepping_mode () | |
1151 | { | |
c5aa993b | 1152 | thread_info *p; |
c906108c SS |
1153 | |
1154 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
1155 | if (debug_on) |
1156 | printf ("clear_all_stepping_mode\n"); | |
c906108c SS |
1157 | #endif |
1158 | ||
c5aa993b JM |
1159 | for (p = thread_head.head; p; p = p->next) |
1160 | { | |
1161 | p->stepping_mode = DO_DEFAULT; | |
c906108c SS |
1162 | } |
1163 | ||
c5aa993b JM |
1164 | for (p = deleted_threads.head; p; p = p->next) |
1165 | { | |
1166 | p->stepping_mode = DO_DEFAULT; | |
c906108c SS |
1167 | } |
1168 | } | |
1169 | ||
1170 | /* Set all threads to unseen on this pass. | |
c5aa993b | 1171 | */ |
c906108c SS |
1172 | static void |
1173 | set_all_unseen () | |
1174 | { | |
c5aa993b | 1175 | thread_info *p; |
c906108c | 1176 | |
c5aa993b JM |
1177 | for (p = thread_head.head; p; p = p->next) |
1178 | { | |
1179 | p->seen = 0; | |
c906108c SS |
1180 | } |
1181 | } | |
1182 | ||
1183 | #if (defined( THREAD_DEBUG ) || defined( PARANOIA )) | |
1184 | /* debugging routine. | |
1185 | */ | |
1186 | static void | |
1187 | print_tthread (p) | |
c5aa993b | 1188 | thread_info *p; |
c906108c | 1189 | { |
c5aa993b JM |
1190 | printf (" Thread pid %d, tid %d", p->pid, p->tid); |
1191 | if (p->have_state) | |
1192 | printf (", event is %s", | |
1193 | get_printable_name_of_ttrace_event (p->last_stop_state.tts_event)); | |
1194 | ||
1195 | if (p->am_pseudo) | |
1196 | printf (", pseudo thread"); | |
1197 | ||
1198 | if (p->have_signal) | |
1199 | printf (", have signal 0x%x", p->signal_value); | |
1200 | ||
1201 | if (p->have_start) | |
1202 | printf (", have start at 0x%x", p->start); | |
1203 | ||
1204 | printf (", step is %s", get_printable_name_of_stepping_mode (p->stepping_mode)); | |
1205 | ||
1206 | if (p->handled) | |
1207 | printf (", handled"); | |
1208 | else | |
1209 | printf (", not handled"); | |
1210 | ||
1211 | if (p->seen) | |
1212 | printf (", seen"); | |
1213 | else | |
1214 | printf (", not seen"); | |
1215 | ||
1216 | printf ("\n"); | |
c906108c SS |
1217 | } |
1218 | ||
1219 | static void | |
1220 | print_tthreads () | |
1221 | { | |
c5aa993b JM |
1222 | thread_info *p; |
1223 | ||
1224 | if (thread_head.count == 0) | |
1225 | printf ("Thread list is empty\n"); | |
1226 | else | |
1227 | { | |
1228 | printf ("Thread list has "); | |
1229 | if (thread_head.count == 1) | |
1230 | printf ("1 entry:\n"); | |
1231 | else | |
1232 | printf ("%d entries:\n", thread_head.count); | |
1233 | for (p = thread_head.head; p; p = p->next) | |
1234 | { | |
1235 | print_tthread (p); | |
1236 | } | |
1237 | } | |
1238 | ||
1239 | if (deleted_threads.count == 0) | |
1240 | printf ("Deleted thread list is empty\n"); | |
1241 | else | |
1242 | { | |
1243 | printf ("Deleted thread list has "); | |
1244 | if (deleted_threads.count == 1) | |
1245 | printf ("1 entry:\n"); | |
1246 | else | |
1247 | printf ("%d entries:\n", deleted_threads.count); | |
1248 | ||
1249 | for (p = deleted_threads.head; p; p = p->next) | |
1250 | { | |
1251 | print_tthread (p); | |
1252 | } | |
c906108c SS |
1253 | } |
1254 | } | |
1255 | #endif | |
1256 | ||
1257 | /* Update the thread list based on the "seen" bits. | |
1258 | */ | |
1259 | static void | |
1260 | update_thread_list () | |
1261 | { | |
c5aa993b JM |
1262 | thread_info *p; |
1263 | thread_info *chase; | |
c906108c | 1264 | |
c5aa993b JM |
1265 | chase = NULL; |
1266 | for (p = thread_head.head; p; p = p->next) | |
1267 | { | |
c906108c SS |
1268 | /* Is this an "unseen" thread which really happens to be a process? |
1269 | If so, is it inferior_pid and is a vfork in flight? If yes to | |
1270 | all, then DON'T REMOVE IT! We're in the midst of moving a vfork | |
1271 | operation, which is a multiple step thing, to the point where we | |
1272 | can touch the parent again. We've most likely stopped to examine | |
1273 | the child at a late stage in the vfork, and if we're not following | |
1274 | the child, we'd best not treat the parent as a dead "thread"... | |
c5aa993b JM |
1275 | */ |
1276 | if ((!p->seen) && p->am_pseudo && vfork_in_flight | |
1277 | && (p->pid != vforking_child_pid)) | |
1278 | p->seen = 1; | |
c906108c | 1279 | |
c5aa993b JM |
1280 | if (!p->seen) |
1281 | { | |
1282 | /* Remove this one | |
1283 | */ | |
c906108c SS |
1284 | |
1285 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1286 | if (debug_on) |
1287 | printf ("Delete unseen thread: %d \n", p->tid); | |
c906108c | 1288 | #endif |
c5aa993b JM |
1289 | del_tthread (p->tid); |
1290 | } | |
c906108c SS |
1291 | } |
1292 | } | |
c906108c | 1293 | \f |
c5aa993b JM |
1294 | |
1295 | ||
c906108c SS |
1296 | /************************************************ |
1297 | * O/S call wrappers * | |
1298 | ************************************************ | |
1299 | */ | |
1300 | ||
1301 | /* This function simply calls ttrace with the given arguments. | |
1302 | * It exists so that all calls to ttrace are isolated. All | |
1303 | * parameters should be as specified by "man 2 ttrace". | |
1304 | * | |
1305 | * No other "raw" calls to ttrace should exist in this module. | |
1306 | */ | |
1307 | static int | |
c5aa993b JM |
1308 | call_real_ttrace (request, pid, tid, addr, data, addr2) |
1309 | ttreq_t request; | |
1310 | pid_t pid; | |
1311 | lwpid_t tid; | |
1312 | TTRACE_ARG_TYPE addr, data, addr2; | |
c906108c | 1313 | { |
c5aa993b | 1314 | int tt_status; |
c906108c SS |
1315 | |
1316 | errno = 0; | |
c5aa993b | 1317 | tt_status = ttrace (request, pid, tid, addr, data, addr2); |
c906108c SS |
1318 | |
1319 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1320 | if (errno) |
1321 | { | |
1322 | /* Don't bother for a known benign error: if you ask for the | |
1323 | * first thread state, but there is only one thread and it's | |
1324 | * not stopped, ttrace complains. | |
1325 | * | |
1326 | * We have this inside the #ifdef because our caller will do | |
1327 | * this check for real. | |
1328 | */ | |
1329 | if (request != TT_PROC_GET_FIRST_LWP_STATE | |
1330 | || errno != EPROTO) | |
1331 | { | |
1332 | if (debug_on) | |
1333 | printf ("TT fail for %s, with pid %d, tid %d, status %d \n", | |
1334 | get_printable_name_of_ttrace_request (request), | |
1335 | pid, tid, tt_status); | |
1336 | } | |
c906108c | 1337 | } |
c906108c SS |
1338 | #endif |
1339 | ||
1340 | #if 0 | |
1341 | /* ??rehrauer: It would probably be most robust to catch and report | |
1342 | * failed requests here. However, some clients of this interface | |
1343 | * seem to expect to catch & deal with them, so we'd best not. | |
1344 | */ | |
c5aa993b JM |
1345 | if (errno) |
1346 | { | |
1347 | strcpy (reason_for_failure, "ttrace ("); | |
1348 | strcat (reason_for_failure, get_printable_name_of_ttrace_request (request)); | |
1349 | strcat (reason_for_failure, ")"); | |
1350 | printf ("ttrace error, errno = %d\n", errno); | |
1351 | perror_with_name (reason_for_failure); | |
1352 | } | |
c906108c SS |
1353 | #endif |
1354 | ||
1355 | return tt_status; | |
1356 | } | |
c906108c | 1357 | \f |
c5aa993b | 1358 | |
c906108c SS |
1359 | /* This function simply calls ttrace_wait with the given arguments. |
1360 | * It exists so that all calls to ttrace_wait are isolated. | |
1361 | * | |
1362 | * No "raw" calls to ttrace_wait should exist elsewhere. | |
1363 | */ | |
1364 | static int | |
c5aa993b JM |
1365 | call_real_ttrace_wait (pid, tid, option, tsp, tsp_size) |
1366 | int pid; | |
1367 | lwpid_t tid; | |
1368 | ttwopt_t option; | |
1369 | ttstate_t *tsp; | |
1370 | size_t tsp_size; | |
c906108c | 1371 | { |
c5aa993b JM |
1372 | int ttw_status; |
1373 | thread_info *tinfo = NULL; | |
c906108c SS |
1374 | |
1375 | errno = 0; | |
1376 | ttw_status = ttrace_wait (pid, tid, option, tsp, tsp_size); | |
c5aa993b JM |
1377 | |
1378 | if (errno) | |
1379 | { | |
c906108c | 1380 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1381 | if (debug_on) |
1382 | printf ("TW fail with pid %d, tid %d \n", pid, tid); | |
c906108c SS |
1383 | #endif |
1384 | ||
1385 | perror_with_name ("ttrace wait"); | |
c5aa993b | 1386 | } |
c906108c SS |
1387 | |
1388 | return ttw_status; | |
1389 | } | |
c906108c | 1390 | \f |
c5aa993b | 1391 | |
c906108c SS |
1392 | /* A process may have one or more kernel threads, of which all or |
1393 | none may be stopped. This function returns the ID of the first | |
1394 | kernel thread in a stopped state, or 0 if none are stopped. | |
1395 | ||
1396 | This function can be used with get_process_next_stopped_thread_id | |
1397 | to iterate over the IDs of all stopped threads of this process. | |
1398 | */ | |
1399 | static lwpid_t | |
1400 | get_process_first_stopped_thread_id (pid, thread_state) | |
c5aa993b JM |
1401 | int pid; |
1402 | ttstate_t *thread_state; | |
c906108c | 1403 | { |
c5aa993b | 1404 | int tt_status; |
c906108c SS |
1405 | |
1406 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
1407 | TT_PROC_GET_FIRST_LWP_STATE, |
1408 | (pid_t) pid, | |
1409 | (lwpid_t) TT_NIL, | |
1410 | (TTRACE_ARG_TYPE) thread_state, | |
1411 | (TTRACE_ARG_TYPE) sizeof (*thread_state), | |
1412 | TT_NIL); | |
1413 | ||
1414 | if (errno) | |
1415 | { | |
1416 | if (errno == EPROTO) | |
1417 | { | |
1418 | /* This is an error we can handle: there isn't any stopped | |
1419 | * thread. This happens when we're re-starting the application | |
1420 | * and it has only one thread. GET_NEXT handles the case of | |
1421 | * no more stopped threads well; GET_FIRST doesn't. (A ttrace | |
1422 | * "feature".) | |
1423 | */ | |
1424 | tt_status = 1; | |
1425 | errno = 0; | |
1426 | return 0; | |
1427 | } | |
1428 | else | |
1429 | perror_with_name ("ttrace"); | |
1430 | } | |
1431 | ||
1432 | if (tt_status < 0) | |
c906108c SS |
1433 | /* Failed somehow. |
1434 | */ | |
1435 | return 0; | |
1436 | ||
1437 | return thread_state->tts_lwpid; | |
1438 | } | |
c906108c | 1439 | \f |
c5aa993b | 1440 | |
c906108c SS |
1441 | /* This function returns the ID of the "next" kernel thread in a |
1442 | stopped state, or 0 if there are none. "Next" refers to the | |
1443 | thread following that of the last successful call to this | |
1444 | function or to get_process_first_stopped_thread_id, using | |
1445 | the value of thread_state returned by that call. | |
1446 | ||
1447 | This function can be used with get_process_first_stopped_thread_id | |
1448 | to iterate over the IDs of all stopped threads of this process. | |
1449 | */ | |
1450 | static lwpid_t | |
1451 | get_process_next_stopped_thread_id (pid, thread_state) | |
c5aa993b JM |
1452 | int pid; |
1453 | ttstate_t *thread_state; | |
c906108c | 1454 | { |
c5aa993b | 1455 | int tt_status; |
c906108c SS |
1456 | |
1457 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
1458 | TT_PROC_GET_NEXT_LWP_STATE, |
1459 | (pid_t) pid, | |
1460 | (lwpid_t) TT_NIL, | |
1461 | (TTRACE_ARG_TYPE) thread_state, | |
1462 | (TTRACE_ARG_TYPE) sizeof (*thread_state), | |
1463 | TT_NIL); | |
c906108c SS |
1464 | if (errno) |
1465 | perror_with_name ("ttrace"); | |
1466 | ||
1467 | if (tt_status < 0) | |
1468 | /* Failed | |
1469 | */ | |
1470 | return 0; | |
1471 | ||
c5aa993b JM |
1472 | else if (tt_status == 0) |
1473 | { | |
1474 | /* End of list, no next state. Don't return the | |
1475 | * tts_lwpid, as it's a meaningless "240". | |
1476 | * | |
1477 | * This is an HPUX "feature". | |
1478 | */ | |
1479 | return 0; | |
1480 | } | |
1481 | ||
c906108c SS |
1482 | return thread_state->tts_lwpid; |
1483 | } | |
1484 | ||
1485 | /* ??rehrauer: Eventually this function perhaps should be calling | |
1486 | pid_to_thread_id. However, that function currently does nothing | |
1487 | for HP-UX. Even then, I'm not clear whether that function | |
1488 | will return a "kernel" thread ID, or a "user" thread ID. If | |
1489 | the former, we can just call it here. If the latter, we must | |
1490 | map from the "user" tid to a "kernel" tid. | |
1491 | ||
1492 | NOTE: currently not called. | |
1493 | */ | |
1494 | static lwpid_t | |
1495 | get_active_tid_of_pid (pid) | |
c5aa993b | 1496 | int pid; |
c906108c | 1497 | { |
c5aa993b | 1498 | ttstate_t thread_state; |
c906108c SS |
1499 | |
1500 | return get_process_first_stopped_thread_id (pid, &thread_state); | |
1501 | } | |
1502 | ||
1503 | /* This function returns 1 if tt_request is a ttrace request that | |
1504 | * operates upon all threads of a (i.e., the entire) process. | |
1505 | */ | |
1506 | int | |
1507 | is_process_ttrace_request (tt_request) | |
c5aa993b | 1508 | ttreq_t tt_request; |
c906108c SS |
1509 | { |
1510 | return IS_TTRACE_PROCREQ (tt_request); | |
1511 | } | |
c906108c | 1512 | \f |
c5aa993b | 1513 | |
c906108c SS |
1514 | /* This function translates a thread ttrace request into |
1515 | * the equivalent process request for a one-thread process. | |
1516 | */ | |
1517 | static ttreq_t | |
c5aa993b JM |
1518 | make_process_version (request) |
1519 | ttreq_t request; | |
c906108c | 1520 | { |
c5aa993b JM |
1521 | if (!IS_TTRACE_REQ (request)) |
1522 | { | |
1523 | error ("Internal error, bad ttrace request made\n"); | |
1524 | return -1; | |
1525 | } | |
c906108c | 1526 | |
c5aa993b JM |
1527 | switch (request) |
1528 | { | |
1529 | case TT_LWP_STOP: | |
c906108c SS |
1530 | return TT_PROC_STOP; |
1531 | ||
c5aa993b | 1532 | case TT_LWP_CONTINUE: |
c906108c SS |
1533 | return TT_PROC_CONTINUE; |
1534 | ||
c5aa993b | 1535 | case TT_LWP_GET_EVENT_MASK: |
c906108c SS |
1536 | return TT_PROC_GET_EVENT_MASK; |
1537 | ||
c5aa993b | 1538 | case TT_LWP_SET_EVENT_MASK: |
c906108c SS |
1539 | return TT_PROC_SET_EVENT_MASK; |
1540 | ||
c5aa993b JM |
1541 | case TT_LWP_SINGLE: |
1542 | case TT_LWP_RUREGS: | |
1543 | case TT_LWP_WUREGS: | |
1544 | case TT_LWP_GET_STATE: | |
1545 | return -1; /* No equivalent */ | |
c906108c | 1546 | |
c5aa993b | 1547 | default: |
c906108c | 1548 | return request; |
c5aa993b | 1549 | } |
c906108c | 1550 | } |
c906108c | 1551 | \f |
c5aa993b | 1552 | |
c906108c SS |
1553 | /* This function translates the "pid" used by the rest of |
1554 | * gdb to a real pid and a tid. It then calls "call_real_ttrace" | |
1555 | * with the given arguments. | |
1556 | * | |
1557 | * In general, other parts of this module should call this | |
1558 | * function when they are dealing with external users, who only | |
1559 | * have tids to pass (but they call it "pid" for historical | |
1560 | * reasons). | |
1561 | */ | |
1562 | static int | |
c5aa993b JM |
1563 | call_ttrace (request, gdb_tid, addr, data, addr2) |
1564 | ttreq_t request; | |
1565 | int gdb_tid; | |
1566 | TTRACE_ARG_TYPE addr, data, addr2; | |
c906108c | 1567 | { |
c5aa993b JM |
1568 | lwpid_t real_tid; |
1569 | int real_pid; | |
1570 | ttreq_t new_request; | |
1571 | int tt_status; | |
1572 | char reason_for_failure[100]; /* Arbitrary size, should be big enough. */ | |
1573 | ||
c906108c | 1574 | #ifdef THREAD_DEBUG |
c5aa993b | 1575 | int is_interesting = 0; |
c906108c | 1576 | |
c5aa993b JM |
1577 | if (TT_LWP_RUREGS == request) |
1578 | { | |
1579 | is_interesting = 1; /* Adjust code here as desired */ | |
1580 | } | |
1581 | ||
1582 | if (is_interesting && 0 && debug_on) | |
1583 | { | |
1584 | if (!is_process_ttrace_request (request)) | |
1585 | { | |
1586 | printf ("TT: Thread request, tid is %d", gdb_tid); | |
1587 | printf ("== SINGLE at %x", addr); | |
1588 | } | |
1589 | else | |
1590 | { | |
1591 | printf ("TT: Process request, tid is %d\n", gdb_tid); | |
1592 | printf ("==! SINGLE at %x", addr); | |
1593 | } | |
1594 | } | |
c906108c SS |
1595 | #endif |
1596 | ||
1597 | /* The initial SETTRC and SET_EVENT_MASK calls (and all others | |
1598 | * which happen before any threads get set up) should go | |
1599 | * directly to "call_real_ttrace", so they don't happen here. | |
1600 | * | |
1601 | * But hardware watchpoints do a SET_EVENT_MASK, so we can't | |
1602 | * rule them out.... | |
1603 | */ | |
1604 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1605 | if (request == TT_PROC_SETTRC && debug_on) |
1606 | printf ("Unexpected call for TT_PROC_SETTRC\n"); | |
c906108c SS |
1607 | #endif |
1608 | ||
1609 | /* Sometimes we get called with a bogus tid (e.g., if a | |
1610 | * thread has terminated, we return 0; inftarg later asks | |
1611 | * whether the thread has exited/forked/vforked). | |
1612 | */ | |
c5aa993b | 1613 | if (gdb_tid == 0) |
c906108c | 1614 | { |
c5aa993b | 1615 | errno = ESRCH; /* ttrace's response would probably be "No such process". */ |
c906108c SS |
1616 | return -1; |
1617 | } | |
1618 | ||
1619 | /* All other cases should be able to expect that there are | |
1620 | * thread records. | |
1621 | */ | |
c5aa993b JM |
1622 | if (!any_thread_records ()) |
1623 | { | |
c906108c | 1624 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1625 | if (debug_on) |
1626 | warning ("No thread records for ttrace call"); | |
c906108c | 1627 | #endif |
c5aa993b | 1628 | errno = ESRCH; /* ttrace's response would be "No such process". */ |
c906108c | 1629 | return -1; |
c5aa993b | 1630 | } |
c906108c SS |
1631 | |
1632 | /* OK, now the task is to translate the incoming tid into | |
1633 | * a pid/tid pair. | |
1634 | */ | |
c5aa993b JM |
1635 | real_tid = map_from_gdb_tid (gdb_tid); |
1636 | real_pid = get_pid_for (real_tid); | |
c906108c SS |
1637 | |
1638 | /* Now check the result. "Real_pid" is NULL if our list | |
1639 | * didn't find it. We have some tricks we can play to fix | |
1640 | * this, however. | |
1641 | */ | |
c5aa993b JM |
1642 | if (0 == real_pid) |
1643 | { | |
1644 | ttstate_t thread_state; | |
c906108c SS |
1645 | |
1646 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1647 | if (debug_on) |
1648 | printf ("No saved pid for tid %d\n", gdb_tid); | |
c906108c SS |
1649 | #endif |
1650 | ||
c5aa993b JM |
1651 | if (is_process_ttrace_request (request)) |
1652 | { | |
1653 | ||
1654 | /* Ok, we couldn't get a tid. Try to translate to | |
1655 | * the equivalent process operation. We expect this | |
1656 | * NOT to happen, so this is a desparation-type | |
1657 | * move. It can happen if there is an internal | |
1658 | * error and so no "wait()" call is ever done. | |
1659 | */ | |
1660 | new_request = make_process_version (request); | |
1661 | if (new_request == -1) | |
1662 | { | |
1663 | ||
c906108c | 1664 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1665 | if (debug_on) |
1666 | printf ("...and couldn't make process version of thread operation\n"); | |
c906108c SS |
1667 | #endif |
1668 | ||
c5aa993b JM |
1669 | /* Use hacky saved pid, which won't always be correct |
1670 | * in the multi-process future. Use tid as thread, | |
1671 | * probably dooming this to failure. FIX! | |
1672 | */ | |
1673 | if (saved_real_pid != 0) | |
1674 | { | |
c906108c | 1675 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1676 | if (debug_on) |
1677 | printf ("...using saved pid %d\n", saved_real_pid); | |
c906108c SS |
1678 | #endif |
1679 | ||
c5aa993b JM |
1680 | real_pid = saved_real_pid; |
1681 | real_tid = gdb_tid; | |
1682 | } | |
c906108c | 1683 | |
c5aa993b JM |
1684 | else |
1685 | error ("Unable to perform thread operation"); | |
1686 | } | |
c906108c | 1687 | |
c5aa993b JM |
1688 | else |
1689 | { | |
1690 | /* Sucessfully translated this to a process request, | |
1691 | * which needs no thread value. | |
1692 | */ | |
1693 | real_pid = gdb_tid; | |
1694 | real_tid = 0; | |
1695 | request = new_request; | |
c906108c SS |
1696 | |
1697 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1698 | if (debug_on) |
1699 | { | |
1700 | printf ("Translated thread request to process request\n"); | |
1701 | if (saved_real_pid == 0) | |
1702 | printf ("...but there's no saved pid\n"); | |
1703 | ||
1704 | else | |
1705 | { | |
1706 | if (gdb_tid != saved_real_pid) | |
1707 | printf ("...but have the wrong pid (%d rather than %d)\n", | |
1708 | gdb_tid, saved_real_pid); | |
1709 | } | |
1710 | } | |
c906108c | 1711 | #endif |
c5aa993b JM |
1712 | } /* Translated to a process request */ |
1713 | } /* Is a process request */ | |
c906108c | 1714 | |
c5aa993b JM |
1715 | else |
1716 | { | |
1717 | /* We have to have a thread. Ooops. | |
1718 | */ | |
1719 | error ("Thread request with no threads (%s)", | |
1720 | get_printable_name_of_ttrace_request (request)); | |
1721 | } | |
c906108c | 1722 | } |
c906108c SS |
1723 | |
1724 | /* Ttrace doesn't like to see tid values on process requests, | |
1725 | * even if we have the right one. | |
1726 | */ | |
c5aa993b JM |
1727 | if (is_process_ttrace_request (request)) |
1728 | { | |
c906108c | 1729 | real_tid = 0; |
c5aa993b JM |
1730 | } |
1731 | ||
c906108c | 1732 | #ifdef THREAD_DEBUG |
c5aa993b JM |
1733 | if (is_interesting && 0 && debug_on) |
1734 | { | |
1735 | printf (" now tid %d, pid %d\n", real_tid, real_pid); | |
1736 | printf (" request is %s\n", get_printable_name_of_ttrace_request (request)); | |
1737 | } | |
c906108c SS |
1738 | #endif |
1739 | ||
1740 | /* Finally, the (almost) real call. | |
1741 | */ | |
1742 | tt_status = call_real_ttrace (request, real_pid, real_tid, addr, data, addr2); | |
1743 | ||
1744 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
1745 | if (is_interesting && debug_on) |
1746 | { | |
1747 | if (!TT_OK (tt_status, errno) | |
1748 | && !(tt_status == 0 & errno == 0)) | |
1749 | printf (" got error (errno==%d, status==%d)\n", errno, tt_status); | |
1750 | } | |
c906108c SS |
1751 | #endif |
1752 | ||
1753 | return tt_status; | |
1754 | } | |
1755 | ||
1756 | ||
1757 | /* Stop all the threads of a process. | |
c5aa993b | 1758 | |
c906108c SS |
1759 | * NOTE: use of TT_PROC_STOP can cause a thread with a real event |
1760 | * to get a TTEVT_NONE event, discarding the old event. Be | |
1761 | * very careful, and only call TT_PROC_STOP when you mean it! | |
1762 | */ | |
1763 | static void | |
c5aa993b JM |
1764 | stop_all_threads_of_process (real_pid) |
1765 | pid_t real_pid; | |
c906108c | 1766 | { |
c5aa993b | 1767 | int ttw_status; |
c906108c SS |
1768 | |
1769 | ttw_status = call_real_ttrace (TT_PROC_STOP, | |
c5aa993b JM |
1770 | (pid_t) real_pid, |
1771 | (lwpid_t) TT_NIL, | |
1772 | (TTRACE_ARG_TYPE) TT_NIL, | |
1773 | (TTRACE_ARG_TYPE) TT_NIL, | |
1774 | TT_NIL); | |
c906108c SS |
1775 | if (errno) |
1776 | perror_with_name ("ttrace stop of other threads"); | |
1777 | } | |
1778 | ||
1779 | ||
1780 | /* Under some circumstances, it's unsafe to attempt to stop, or even | |
1781 | query the state of, a process' threads. | |
1782 | ||
1783 | In ttrace-based HP-UX, an example is a vforking child process. The | |
1784 | vforking parent and child are somewhat fragile, w/r/t what we can do | |
1785 | what we can do to them with ttrace, until after the child exits or | |
1786 | execs, or until the parent's vfork event is delivered. Until that | |
1787 | time, we must not try to stop the process' threads, or inquire how | |
1788 | many there are, or even alter its data segments, or it typically dies | |
1789 | with a SIGILL. Sigh. | |
1790 | ||
1791 | This function returns 1 if this stopped process, and the event that | |
1792 | we're told was responsible for its current stopped state, cannot safely | |
1793 | have its threads examined. | |
c5aa993b | 1794 | */ |
c906108c SS |
1795 | #define CHILD_VFORKED(evt,pid) \ |
1796 | (((evt) == TTEVT_VFORK) && ((pid) != inferior_pid)) | |
1797 | #define CHILD_URPED(evt,pid) \ | |
1798 | ((((evt) == TTEVT_EXEC) || ((evt) == TTEVT_EXIT)) && ((pid) != vforking_child_pid)) | |
1799 | #define PARENT_VFORKED(evt,pid) \ | |
1800 | (((evt) == TTEVT_VFORK) && ((pid) == inferior_pid)) | |
1801 | ||
1802 | static int | |
1803 | can_touch_threads_of_process (pid, stopping_event) | |
c5aa993b JM |
1804 | int pid; |
1805 | ttevents_t stopping_event; | |
c906108c SS |
1806 | { |
1807 | if (CHILD_VFORKED (stopping_event, pid)) | |
1808 | { | |
1809 | vforking_child_pid = pid; | |
1810 | vfork_in_flight = 1; | |
1811 | } | |
1812 | ||
1813 | else if (vfork_in_flight && | |
c5aa993b JM |
1814 | (PARENT_VFORKED (stopping_event, pid) || |
1815 | CHILD_URPED (stopping_event, pid))) | |
c906108c SS |
1816 | { |
1817 | vfork_in_flight = 0; | |
1818 | vforking_child_pid = 0; | |
1819 | } | |
1820 | ||
c5aa993b | 1821 | return !vfork_in_flight; |
c906108c SS |
1822 | } |
1823 | ||
1824 | ||
1825 | /* If we can find an as-yet-unhandled thread state of a | |
1826 | * stopped thread of this process return 1 and set "tsp". | |
1827 | * Return 0 if we can't. | |
1828 | * | |
1829 | * If this function is used when the threads of PIS haven't | |
1830 | * been stopped, undefined behaviour is guaranteed! | |
1831 | */ | |
c5aa993b | 1832 | static int |
c906108c | 1833 | select_stopped_thread_of_process (pid, tsp) |
c5aa993b JM |
1834 | int pid; |
1835 | ttstate_t *tsp; | |
c906108c | 1836 | { |
c5aa993b JM |
1837 | lwpid_t candidate_tid, tid; |
1838 | ttstate_t candidate_tstate, tstate; | |
c906108c SS |
1839 | |
1840 | /* If we're not allowed to touch the process now, then just | |
1841 | * return the current value of *TSP. | |
1842 | * | |
1843 | * This supports "vfork". It's ok, really, to double the | |
1844 | * current event (the child EXEC, we hope!). | |
1845 | */ | |
c5aa993b | 1846 | if (!can_touch_threads_of_process (pid, tsp->tts_event)) |
c906108c SS |
1847 | return 1; |
1848 | ||
1849 | /* Decide which of (possibly more than one) events to | |
1850 | * return as the first one. We scan them all so that | |
1851 | * we always return the result of a fake-step first. | |
1852 | */ | |
1853 | candidate_tid = 0; | |
1854 | for (tid = get_process_first_stopped_thread_id (pid, &tstate); | |
1855 | tid != 0; | |
1856 | tid = get_process_next_stopped_thread_id (pid, &tstate)) | |
1857 | { | |
1858 | /* TTEVT_NONE events are uninteresting to our clients. They're | |
1859 | * an artifact of our "stop the world" model--the thread is | |
1860 | * stopped because we stopped it. | |
1861 | */ | |
c5aa993b JM |
1862 | if (tstate.tts_event == TTEVT_NONE) |
1863 | { | |
1864 | set_handled (pid, tstate.tts_lwpid); | |
1865 | } | |
c906108c SS |
1866 | |
1867 | /* Did we just single-step a single thread, without letting any | |
1868 | * of the others run? Is this an event for that thread? | |
1869 | * | |
1870 | * If so, we believe our client would prefer to see this event | |
1871 | * over any others. (Typically the client wants to just push | |
1872 | * one thread a little farther forward, and then go around | |
1873 | * checking for what all threads are doing.) | |
1874 | */ | |
1875 | else if (doing_fake_step && (tstate.tts_lwpid == fake_step_tid)) | |
c5aa993b | 1876 | { |
c906108c | 1877 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1878 | /* It's possible here to see either a SIGTRAP (due to |
1879 | * successful completion of a step) or a SYSCALL_ENTRY | |
1880 | * (due to a step completion with active hardware | |
1881 | * watchpoints). | |
1882 | */ | |
1883 | if (debug_on) | |
1884 | printf ("Ending fake step with tid %d, state %s\n", | |
1885 | tstate.tts_lwpid, | |
1886 | get_printable_name_of_ttrace_event (tstate.tts_event)); | |
1887 | #endif | |
1888 | ||
1889 | /* Remember this one, and throw away any previous | |
1890 | * candidate. | |
1891 | */ | |
1892 | candidate_tid = tstate.tts_lwpid; | |
1893 | candidate_tstate = tstate; | |
1894 | } | |
c906108c SS |
1895 | |
1896 | #ifdef FORGET_DELETED_BPTS | |
1897 | ||
1898 | /* We can't just do this, as if we do, and then wind | |
1899 | * up the loop with no unhandled events, we need to | |
1900 | * handle that case--the appropriate reaction is to | |
1901 | * just continue, but there's no easy way to do that. | |
1902 | * | |
1903 | * Better to put this in the ttrace_wait call--if, when | |
1904 | * we fake a wait, we update our events based on the | |
1905 | * breakpoint_here_pc call and find there are no more events, | |
1906 | * then we better continue and so on. | |
1907 | * | |
1908 | * Or we could put it in the next/continue fake. | |
1909 | * But it has to go in the buffering code, not in the | |
1910 | * real go/wait code. | |
1911 | */ | |
c5aa993b JM |
1912 | else if ((TTEVT_SIGNAL == tstate.tts_event) |
1913 | && (5 == tstate.tts_u.tts_signal.tts_signo) | |
1914 | && (0 != get_raw_pc (tstate.tts_lwpid)) | |
1915 | && !breakpoint_here_p (get_raw_pc (tstate.tts_lwpid))) | |
1916 | { | |
1917 | /* | |
1918 | * If the user deleted a breakpoint while this | |
1919 | * breakpoint-hit event was buffered, we can forget | |
1920 | * it now. | |
1921 | */ | |
c906108c | 1922 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
1923 | if (debug_on) |
1924 | printf ("Forgetting deleted bp hit for thread %d\n", | |
1925 | tstate.tts_lwpid); | |
1926 | #endif | |
c906108c | 1927 | |
c5aa993b JM |
1928 | set_handled (pid, tstate.tts_lwpid); |
1929 | } | |
c906108c SS |
1930 | #endif |
1931 | ||
1932 | /* Else, is this the first "unhandled" event? If so, | |
1933 | * we believe our client wants to see it (if we don't | |
1934 | * see a fake-step later on in the scan). | |
1935 | */ | |
c5aa993b JM |
1936 | else if (!was_handled (tstate.tts_lwpid) && candidate_tid == 0) |
1937 | { | |
1938 | candidate_tid = tstate.tts_lwpid; | |
1939 | candidate_tstate = tstate; | |
1940 | } | |
c906108c SS |
1941 | |
1942 | /* This is either an event that has already been "handled", | |
1943 | * and thus we believe is uninteresting to our client, or we | |
1944 | * already have a candidate event. Ignore it... | |
1945 | */ | |
1946 | } | |
1947 | ||
1948 | /* What do we report? | |
1949 | */ | |
c5aa993b JM |
1950 | if (doing_fake_step) |
1951 | { | |
1952 | if (candidate_tid == fake_step_tid) | |
1953 | { | |
1954 | /* Fake step. | |
1955 | */ | |
1956 | tstate = candidate_tstate; | |
1957 | } | |
1958 | else | |
1959 | { | |
1960 | warning ("Internal error: fake-step failed to complete."); | |
1961 | return 0; | |
1962 | } | |
1963 | } | |
1964 | else if (candidate_tid != 0) | |
1965 | { | |
c906108c SS |
1966 | /* Found a candidate unhandled event. |
1967 | */ | |
1968 | tstate = candidate_tstate; | |
c5aa993b JM |
1969 | } |
1970 | else if (tid != 0) | |
1971 | { | |
1972 | warning ("Internal error in call of ttrace_wait."); | |
c906108c | 1973 | return 0; |
c5aa993b JM |
1974 | } |
1975 | else | |
1976 | { | |
c906108c SS |
1977 | warning ("Internal error: no unhandled thread event to select"); |
1978 | return 0; | |
c5aa993b | 1979 | } |
c906108c SS |
1980 | |
1981 | copy_ttstate_t (tsp, &tstate); | |
1982 | return 1; | |
c5aa993b | 1983 | } /* End of select_stopped_thread_of_process */ |
c906108c SS |
1984 | |
1985 | #ifdef PARANOIA | |
1986 | /* Check our internal thread data against the real thing. | |
1987 | */ | |
1988 | static void | |
c5aa993b JM |
1989 | check_thread_consistency (real_pid) |
1990 | pid_t real_pid; | |
c906108c | 1991 | { |
c5aa993b JM |
1992 | int tid; /* really lwpid_t */ |
1993 | ttstate_t tstate; | |
1994 | thread_info *p; | |
c906108c | 1995 | |
c5aa993b JM |
1996 | /* Spin down the O/S list of threads, checking that they |
1997 | * match what we've got. | |
1998 | */ | |
1999 | for (tid = get_process_first_stopped_thread_id (real_pid, &tstate); | |
2000 | tid != 0; | |
2001 | tid = get_process_next_stopped_thread_id (real_pid, &tstate)) | |
2002 | { | |
c906108c | 2003 | |
c5aa993b | 2004 | p = find_thread_info (tid); |
c906108c | 2005 | |
c5aa993b JM |
2006 | if (NULL == p) |
2007 | { | |
2008 | warning ("No internal thread data for thread %d.", tid); | |
2009 | continue; | |
2010 | } | |
2011 | ||
2012 | if (!p->seen) | |
2013 | { | |
2014 | warning ("Inconsistent internal thread data for thread %d.", tid); | |
2015 | } | |
2016 | ||
2017 | if (p->terminated) | |
2018 | { | |
2019 | warning ("Thread %d is not terminated, internal error.", tid); | |
2020 | continue; | |
2021 | } | |
c906108c SS |
2022 | |
2023 | ||
2024 | #define TT_COMPARE( fld ) \ | |
2025 | tstate.fld != p->last_stop_state.fld | |
c5aa993b JM |
2026 | |
2027 | if (p->have_state) | |
2028 | { | |
2029 | if (TT_COMPARE (tts_pid) | |
2030 | || TT_COMPARE (tts_lwpid) | |
2031 | || TT_COMPARE (tts_user_tid) | |
2032 | || TT_COMPARE (tts_event) | |
2033 | || TT_COMPARE (tts_flags) | |
2034 | || TT_COMPARE (tts_scno) | |
2035 | || TT_COMPARE (tts_scnargs)) | |
2036 | { | |
2037 | warning ("Internal thread data for thread %d is wrong.", tid); | |
2038 | continue; | |
2039 | } | |
2040 | } | |
c906108c SS |
2041 | } |
2042 | } | |
c5aa993b | 2043 | #endif /* PARANOIA */ |
c906108c | 2044 | \f |
c5aa993b | 2045 | |
c906108c SS |
2046 | /* This function wraps calls to "call_real_ttrace_wait" so |
2047 | * that a actual wait is only done when all pending events | |
2048 | * have been reported. | |
2049 | * | |
2050 | * Note that typically it is called with a pid of "0", i.e. | |
2051 | * the "don't care" value. | |
2052 | * | |
2053 | * Return value is the status of the pseudo wait. | |
2054 | */ | |
2055 | static int | |
c5aa993b JM |
2056 | call_ttrace_wait (pid, option, tsp, tsp_size) |
2057 | int pid; | |
2058 | ttwopt_t option; | |
2059 | ttstate_t *tsp; | |
2060 | size_t tsp_size; | |
c906108c SS |
2061 | { |
2062 | /* This holds the actual, for-real, true process ID. | |
2063 | */ | |
2064 | static int real_pid; | |
2065 | ||
2066 | /* As an argument to ttrace_wait, zero pid | |
2067 | * means "Any process", and zero tid means | |
2068 | * "Any thread of the specified process". | |
2069 | */ | |
c5aa993b JM |
2070 | int wait_pid = 0; |
2071 | lwpid_t wait_tid = 0; | |
2072 | lwpid_t real_tid; | |
c906108c | 2073 | |
c5aa993b | 2074 | int ttw_status = 0; /* To be returned */ |
c906108c | 2075 | |
c5aa993b | 2076 | thread_info *tinfo = NULL; |
c906108c | 2077 | |
c5aa993b JM |
2078 | if (pid != 0) |
2079 | { | |
c906108c SS |
2080 | /* Unexpected case. |
2081 | */ | |
2082 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2083 | if (debug_on) |
2084 | printf ("TW: Pid to wait on is %d\n", pid); | |
c906108c SS |
2085 | #endif |
2086 | ||
c5aa993b JM |
2087 | if (!any_thread_records ()) |
2088 | error ("No thread records for ttrace call w. specific pid"); | |
c906108c SS |
2089 | |
2090 | /* OK, now the task is to translate the incoming tid into | |
2091 | * a pid/tid pair. | |
2092 | */ | |
c5aa993b JM |
2093 | real_tid = map_from_gdb_tid (pid); |
2094 | real_pid = get_pid_for (real_tid); | |
c906108c | 2095 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2096 | if (debug_on) |
2097 | printf ("==TW: real pid %d, real tid %d\n", real_pid, real_tid); | |
c906108c | 2098 | #endif |
c5aa993b | 2099 | } |
c906108c SS |
2100 | |
2101 | ||
2102 | /* Sanity checks and set-up. | |
2103 | * Process State | |
2104 | * | |
2105 | * Stopped Running Fake-step (v)Fork | |
2106 | * \________________________________________ | |
2107 | * | | |
2108 | * No buffered events | error wait wait wait | |
2109 | * | | |
2110 | * Buffered events | debuffer error wait debuffer (?) | |
2111 | * | |
2112 | */ | |
c5aa993b JM |
2113 | if (more_events_left == 0) |
2114 | { | |
2115 | ||
2116 | if (process_state == RUNNING) | |
2117 | { | |
2118 | /* OK--normal call of ttrace_wait with no buffered events. | |
2119 | */ | |
2120 | ; | |
2121 | } | |
2122 | else if (process_state == FAKE_STEPPING) | |
2123 | { | |
2124 | /* Ok--call of ttrace_wait to support | |
2125 | * fake stepping with no buffered events. | |
2126 | * | |
2127 | * But we better be fake-stepping! | |
2128 | */ | |
2129 | if (!doing_fake_step) | |
2130 | { | |
2131 | warning ("Inconsistent thread state."); | |
2132 | } | |
2133 | } | |
2134 | else if ((process_state == FORKING) | |
2135 | || (process_state == VFORKING)) | |
2136 | { | |
2137 | /* Ok--there are two processes, so waiting | |
2138 | * for the second while the first is stopped | |
2139 | * is ok. Handled bits stay as they were. | |
2140 | */ | |
2141 | ; | |
2142 | } | |
2143 | else if (process_state == STOPPED) | |
2144 | { | |
2145 | warning ("Process not running at wait call."); | |
2146 | } | |
c906108c | 2147 | else |
c5aa993b JM |
2148 | /* No known state. |
2149 | */ | |
2150 | warning ("Inconsistent process state."); | |
2151 | } | |
2152 | ||
2153 | else | |
2154 | { | |
c906108c SS |
2155 | /* More events left |
2156 | */ | |
c5aa993b JM |
2157 | if (process_state == STOPPED) |
2158 | { | |
2159 | /* OK--buffered events being unbuffered. | |
2160 | */ | |
2161 | ; | |
2162 | } | |
2163 | else if (process_state == RUNNING) | |
2164 | { | |
2165 | /* An error--shouldn't have buffered events | |
2166 | * when running. | |
2167 | */ | |
2168 | warning ("Trying to continue with buffered events:"); | |
2169 | } | |
2170 | else if (process_state == FAKE_STEPPING) | |
2171 | { | |
2172 | /* | |
2173 | * Better be fake-stepping! | |
2174 | */ | |
2175 | if (!doing_fake_step) | |
2176 | { | |
2177 | warning ("Losing buffered thread events!\n"); | |
2178 | } | |
2179 | } | |
2180 | else if ((process_state == FORKING) | |
2181 | || (process_state == VFORKING)) | |
2182 | { | |
2183 | /* Ok--there are two processes, so waiting | |
2184 | * for the second while the first is stopped | |
2185 | * is ok. Handled bits stay as they were. | |
2186 | */ | |
2187 | ; | |
2188 | } | |
c906108c | 2189 | else |
c5aa993b JM |
2190 | warning ("Process in unknown state with buffered events."); |
2191 | } | |
c906108c SS |
2192 | |
2193 | /* Sometimes we have to wait for a particular thread | |
2194 | * (if we're stepping over a bpt). In that case, we | |
2195 | * _know_ it's going to complete the single-step we | |
2196 | * asked for (because we're only doing the step under | |
2197 | * certain very well-understood circumstances), so it | |
2198 | * can't block. | |
2199 | */ | |
c5aa993b JM |
2200 | if (doing_fake_step) |
2201 | { | |
c906108c | 2202 | wait_tid = fake_step_tid; |
c5aa993b | 2203 | wait_pid = get_pid_for (fake_step_tid); |
c906108c SS |
2204 | |
2205 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
2206 | if (debug_on) |
2207 | printf ("Doing a wait after a fake-step for %d, pid %d\n", | |
2208 | wait_tid, wait_pid); | |
c906108c | 2209 | #endif |
c5aa993b | 2210 | } |
c906108c | 2211 | |
c5aa993b JM |
2212 | if (more_events_left == 0 /* No buffered events, need real ones. */ |
2213 | || process_state != STOPPED) | |
2214 | { | |
c906108c SS |
2215 | /* If there are no buffered events, and so we need |
2216 | * real ones, or if we are FORKING, VFORKING, | |
2217 | * FAKE_STEPPING or RUNNING, and thus have to do | |
2218 | * a real wait, then do a real wait. | |
2219 | */ | |
2220 | ||
2221 | #ifdef WAIT_BUFFER_DEBUG | |
2222 | /* Normal case... */ | |
c5aa993b JM |
2223 | if (debug_on) |
2224 | printf ("TW: do it for real; pid %d, tid %d\n", wait_pid, wait_tid); | |
c906108c SS |
2225 | #endif |
2226 | ||
2227 | /* The actual wait call. | |
2228 | */ | |
c5aa993b | 2229 | ttw_status = call_real_ttrace_wait (wait_pid, wait_tid, option, tsp, tsp_size); |
c906108c SS |
2230 | |
2231 | /* Note that the routines we'll call will be using "call_real_ttrace", | |
2232 | * not "call_ttrace", and thus need the real pid rather than the pseudo-tid | |
2233 | * the rest of the world uses (which is actually the tid). | |
2234 | */ | |
2235 | real_pid = tsp->tts_pid; | |
2236 | ||
2237 | /* For most events: Stop the world! | |
c5aa993b | 2238 | |
c906108c SS |
2239 | * It's sometimes not safe to stop all threads of a process. |
2240 | * Sometimes it's not even safe to ask for the thread state | |
2241 | * of a process! | |
2242 | */ | |
2243 | if (can_touch_threads_of_process (real_pid, tsp->tts_event)) | |
c5aa993b JM |
2244 | { |
2245 | /* If we're really only stepping a single thread, then don't | |
2246 | * try to stop all the others -- we only do this single-stepping | |
2247 | * business when all others were already stopped...and the stop | |
2248 | * would mess up other threads' events. | |
2249 | * | |
2250 | * Similiarly, if there are other threads with events, | |
2251 | * don't do the stop. | |
2252 | */ | |
2253 | if (!doing_fake_step) | |
2254 | { | |
2255 | if (more_events_left > 0) | |
2256 | warning ("Internal error in stopping process"); | |
2257 | ||
2258 | stop_all_threads_of_process (real_pid); | |
2259 | ||
2260 | /* At this point, we could scan and update_thread_list(), | |
2261 | * and only use the local list for the rest of the | |
2262 | * module! We'd get rid of the scans in the various | |
2263 | * continue routines (adding one in attach). It'd | |
2264 | * be great--UPGRADE ME! | |
2265 | */ | |
2266 | } | |
2267 | } | |
2268 | ||
c906108c | 2269 | #ifdef PARANOIA |
c5aa993b JM |
2270 | else if (debug_on) |
2271 | { | |
2272 | if (more_events_left > 0) | |
2273 | printf ("== Can't stop process; more events!\n"); | |
2274 | else | |
2275 | printf ("== Can't stop process!\n"); | |
2276 | } | |
c906108c SS |
2277 | #endif |
2278 | ||
c5aa993b | 2279 | process_state = STOPPED; |
c906108c SS |
2280 | |
2281 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
2282 | if (debug_on) |
2283 | printf ("Process set to STOPPED\n"); | |
c906108c | 2284 | #endif |
c5aa993b JM |
2285 | } |
2286 | ||
2287 | else | |
2288 | { | |
c906108c SS |
2289 | /* Fake a call to ttrace_wait. The process must be |
2290 | * STOPPED, as we aren't going to do any wait. | |
2291 | */ | |
2292 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
2293 | if (debug_on) |
2294 | printf ("TW: fake it\n"); | |
c906108c SS |
2295 | #endif |
2296 | ||
c5aa993b JM |
2297 | if (process_state != STOPPED) |
2298 | { | |
2299 | warning ("Process not stopped at wait call, in state '%s'.\n", | |
2300 | get_printable_name_of_process_state (process_state)); | |
2301 | } | |
2302 | ||
2303 | if (doing_fake_step) | |
2304 | error ("Internal error in stepping over breakpoint"); | |
c906108c | 2305 | |
c5aa993b JM |
2306 | ttw_status = 0; /* Faking it is always successful! */ |
2307 | } /* End of fake or not? if */ | |
c906108c SS |
2308 | |
2309 | /* Pick an event to pass to our caller. Be paranoid. | |
2310 | */ | |
c5aa993b JM |
2311 | if (!select_stopped_thread_of_process (real_pid, tsp)) |
2312 | warning ("Can't find event, using previous event."); | |
2313 | ||
2314 | else if (tsp->tts_event == TTEVT_NONE) | |
2315 | warning ("Internal error: no thread has a real event."); | |
c906108c | 2316 | |
c5aa993b JM |
2317 | else if (doing_fake_step) |
2318 | { | |
2319 | if (fake_step_tid != tsp->tts_lwpid) | |
2320 | warning ("Internal error in stepping over breakpoint."); | |
c906108c | 2321 | |
c906108c SS |
2322 | /* This wait clears the (current) fake-step if there was one. |
2323 | */ | |
2324 | doing_fake_step = 0; | |
c5aa993b JM |
2325 | fake_step_tid = 0; |
2326 | } | |
c906108c SS |
2327 | |
2328 | /* We now have a correct tsp and ttw_status for the thread | |
2329 | * which we want to report. So it's "handled"! This call | |
2330 | * will add it to our list if it's not there already. | |
2331 | */ | |
c5aa993b | 2332 | set_handled (real_pid, tsp->tts_lwpid); |
c906108c SS |
2333 | |
2334 | /* Save a copy of the ttrace state of this thread, in our local | |
2335 | thread descriptor. | |
2336 | ||
2337 | This caches the state. The implementation of queries like | |
2338 | target_has_execd can then use this cached state, rather than | |
2339 | be forced to make an explicit ttrace call to get it. | |
2340 | ||
2341 | (Guard against the condition that this is the first time we've | |
2342 | waited on, i.e., seen this thread, and so haven't yet entered | |
2343 | it into our list of threads.) | |
2344 | */ | |
2345 | tinfo = find_thread_info (tsp->tts_lwpid); | |
c5aa993b JM |
2346 | if (tinfo != NULL) |
2347 | { | |
2348 | copy_ttstate_t (&tinfo->last_stop_state, tsp); | |
2349 | tinfo->have_state = 1; | |
2350 | } | |
2351 | ||
c906108c | 2352 | return ttw_status; |
c5aa993b | 2353 | } /* call_ttrace_wait */ |
c906108c SS |
2354 | |
2355 | #if defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL) | |
2356 | int | |
2357 | child_reported_exec_events_per_exec_call () | |
2358 | { | |
c5aa993b | 2359 | return 1; /* ttrace reports the event once per call. */ |
c906108c SS |
2360 | } |
2361 | #endif | |
c5aa993b | 2362 | \f |
c906108c SS |
2363 | |
2364 | ||
c906108c SS |
2365 | /* Our implementation of hardware watchpoints involves making memory |
2366 | pages write-protected. We must remember a page's original permissions, | |
2367 | and we must also know when it is appropriate to restore a page's | |
2368 | permissions to its original state. | |
2369 | ||
2370 | We use a "dictionary" of hardware-watched pages to do this. Each | |
2371 | hardware-watched page is recorded in the dictionary. Each page's | |
2372 | dictionary entry contains the original permissions and a reference | |
2373 | count. Pages are hashed into the dictionary by their start address. | |
2374 | ||
2375 | When hardware watchpoint is set on page X for the first time, page X | |
2376 | is added to the dictionary with a reference count of 1. If other | |
2377 | hardware watchpoints are subsequently set on page X, its reference | |
2378 | count is incremented. When hardware watchpoints are removed from | |
2379 | page X, its reference count is decremented. If a page's reference | |
2380 | count drops to 0, it's permissions are restored and the page's entry | |
2381 | is thrown out of the dictionary. | |
c5aa993b JM |
2382 | */ |
2383 | typedef struct memory_page | |
2384 | { | |
2385 | CORE_ADDR page_start; | |
2386 | int reference_count; | |
2387 | int original_permissions; | |
2388 | struct memory_page *next; | |
2389 | struct memory_page *previous; | |
2390 | } | |
2391 | memory_page_t; | |
c906108c SS |
2392 | |
2393 | #define MEMORY_PAGE_DICTIONARY_BUCKET_COUNT 128 | |
2394 | ||
c5aa993b JM |
2395 | static struct |
2396 | { | |
2397 | LONGEST page_count; | |
2398 | int page_size; | |
2399 | int page_protections_allowed; | |
2400 | /* These are just the heads of chains of actual page descriptors. */ | |
2401 | memory_page_t buckets[MEMORY_PAGE_DICTIONARY_BUCKET_COUNT]; | |
2402 | } | |
2403 | memory_page_dictionary; | |
c906108c SS |
2404 | |
2405 | ||
2406 | static void | |
2407 | require_memory_page_dictionary () | |
2408 | { | |
c5aa993b | 2409 | int i; |
c906108c SS |
2410 | |
2411 | /* Is the memory page dictionary ready for use? If so, we're done. */ | |
2412 | if (memory_page_dictionary.page_count >= (LONGEST) 0) | |
2413 | return; | |
2414 | ||
2415 | /* Else, initialize it. */ | |
2416 | memory_page_dictionary.page_count = (LONGEST) 0; | |
2417 | ||
c5aa993b | 2418 | for (i = 0; i < MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; i++) |
c906108c SS |
2419 | { |
2420 | memory_page_dictionary.buckets[i].page_start = (CORE_ADDR) 0; | |
2421 | memory_page_dictionary.buckets[i].reference_count = 0; | |
2422 | memory_page_dictionary.buckets[i].next = NULL; | |
2423 | memory_page_dictionary.buckets[i].previous = NULL; | |
2424 | } | |
2425 | } | |
2426 | ||
2427 | ||
2428 | static void | |
2429 | retire_memory_page_dictionary () | |
2430 | { | |
c5aa993b | 2431 | memory_page_dictionary.page_count = (LONGEST) - 1; |
c906108c SS |
2432 | } |
2433 | ||
2434 | ||
2435 | /* Write-protect the memory page that starts at this address. | |
2436 | ||
2437 | Returns the original permissions of the page. | |
2438 | */ | |
2439 | static int | |
2440 | write_protect_page (pid, page_start) | |
c5aa993b JM |
2441 | int pid; |
2442 | CORE_ADDR page_start; | |
c906108c | 2443 | { |
c5aa993b JM |
2444 | int tt_status; |
2445 | int original_permissions; | |
2446 | int new_permissions; | |
c906108c SS |
2447 | |
2448 | tt_status = call_ttrace (TT_PROC_GET_MPROTECT, | |
c5aa993b JM |
2449 | pid, |
2450 | (TTRACE_ARG_TYPE) page_start, | |
2451 | TT_NIL, | |
2452 | (TTRACE_ARG_TYPE) & original_permissions); | |
c906108c SS |
2453 | if (errno || (tt_status < 0)) |
2454 | { | |
c5aa993b | 2455 | return 0; /* What else can we do? */ |
c906108c SS |
2456 | } |
2457 | ||
2458 | /* We'll also write-protect the page now, if that's allowed. */ | |
2459 | if (memory_page_dictionary.page_protections_allowed) | |
2460 | { | |
2461 | new_permissions = original_permissions & ~PROT_WRITE; | |
2462 | tt_status = call_ttrace (TT_PROC_SET_MPROTECT, | |
c5aa993b JM |
2463 | pid, |
2464 | (TTRACE_ARG_TYPE) page_start, | |
2465 | (TTRACE_ARG_TYPE) memory_page_dictionary.page_size, | |
2466 | (TTRACE_ARG_TYPE) new_permissions); | |
c906108c | 2467 | if (errno || (tt_status < 0)) |
c5aa993b JM |
2468 | { |
2469 | return 0; /* What else can we do? */ | |
2470 | } | |
c906108c SS |
2471 | } |
2472 | ||
2473 | return original_permissions; | |
2474 | } | |
2475 | ||
2476 | ||
2477 | /* Unwrite-protect the memory page that starts at this address, restoring | |
2478 | (what we must assume are) its original permissions. | |
c5aa993b | 2479 | */ |
c906108c SS |
2480 | static void |
2481 | unwrite_protect_page (pid, page_start, original_permissions) | |
c5aa993b JM |
2482 | int pid; |
2483 | CORE_ADDR page_start; | |
2484 | int original_permissions; | |
c906108c | 2485 | { |
c5aa993b | 2486 | int tt_status; |
c906108c SS |
2487 | |
2488 | tt_status = call_ttrace (TT_PROC_SET_MPROTECT, | |
c5aa993b JM |
2489 | pid, |
2490 | (TTRACE_ARG_TYPE) page_start, | |
2491 | (TTRACE_ARG_TYPE) memory_page_dictionary.page_size, | |
2492 | (TTRACE_ARG_TYPE) original_permissions); | |
c906108c SS |
2493 | if (errno || (tt_status < 0)) |
2494 | { | |
c5aa993b | 2495 | return; /* What else can we do? */ |
c906108c SS |
2496 | } |
2497 | } | |
2498 | ||
2499 | ||
2500 | /* Memory page-protections are used to implement "hardware" watchpoints | |
2501 | on HP-UX. | |
2502 | ||
2503 | For every memory page that is currently being watched (i.e., that | |
2504 | presently should be write-protected), write-protect it. | |
c5aa993b | 2505 | */ |
c906108c SS |
2506 | void |
2507 | hppa_enable_page_protection_events (pid) | |
c5aa993b | 2508 | int pid; |
c906108c | 2509 | { |
c5aa993b | 2510 | int bucket; |
c906108c SS |
2511 | |
2512 | memory_page_dictionary.page_protections_allowed = 1; | |
2513 | ||
c5aa993b | 2514 | for (bucket = 0; bucket < MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; bucket++) |
c906108c | 2515 | { |
c5aa993b | 2516 | memory_page_t *page; |
c906108c SS |
2517 | |
2518 | page = memory_page_dictionary.buckets[bucket].next; | |
2519 | while (page != NULL) | |
c5aa993b JM |
2520 | { |
2521 | page->original_permissions = write_protect_page (pid, page->page_start); | |
2522 | page = page->next; | |
2523 | } | |
c906108c SS |
2524 | } |
2525 | } | |
2526 | ||
2527 | ||
2528 | /* Memory page-protections are used to implement "hardware" watchpoints | |
2529 | on HP-UX. | |
2530 | ||
2531 | For every memory page that is currently being watched (i.e., that | |
2532 | presently is or should be write-protected), un-write-protect it. | |
c5aa993b | 2533 | */ |
c906108c SS |
2534 | void |
2535 | hppa_disable_page_protection_events (pid) | |
c5aa993b | 2536 | int pid; |
c906108c | 2537 | { |
c5aa993b | 2538 | int bucket; |
c906108c | 2539 | |
c5aa993b | 2540 | for (bucket = 0; bucket < MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; bucket++) |
c906108c | 2541 | { |
c5aa993b | 2542 | memory_page_t *page; |
c906108c SS |
2543 | |
2544 | page = memory_page_dictionary.buckets[bucket].next; | |
2545 | while (page != NULL) | |
c5aa993b JM |
2546 | { |
2547 | unwrite_protect_page (pid, page->page_start, page->original_permissions); | |
2548 | page = page->next; | |
2549 | } | |
c906108c SS |
2550 | } |
2551 | ||
2552 | memory_page_dictionary.page_protections_allowed = 0; | |
2553 | } | |
2554 | ||
2555 | /* Count the number of outstanding events. At this | |
2556 | * point, we have selected one thread and its event | |
2557 | * as the one to be "reported" upwards to core gdb. | |
2558 | * That thread is already marked as "handled". | |
2559 | * | |
2560 | * Note: we could just scan our own thread list. FIXME! | |
2561 | */ | |
2562 | static int | |
c5aa993b JM |
2563 | count_unhandled_events (real_pid, real_tid) |
2564 | int real_pid; | |
2565 | lwpid_t real_tid; | |
c906108c | 2566 | { |
c5aa993b JM |
2567 | ttstate_t tstate; |
2568 | lwpid_t ttid; | |
2569 | int events_left; | |
2570 | ||
c906108c SS |
2571 | /* Ok, find out how many threads have real events to report. |
2572 | */ | |
2573 | events_left = 0; | |
c5aa993b | 2574 | ttid = get_process_first_stopped_thread_id (real_pid, &tstate); |
c906108c SS |
2575 | |
2576 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2577 | if (debug_on) |
2578 | { | |
2579 | if (ttid == 0) | |
2580 | printf ("Process %d has no threads\n", real_pid); | |
c906108c | 2581 | else |
c5aa993b JM |
2582 | printf ("Process %d has these threads:\n", real_pid); |
2583 | } | |
c906108c SS |
2584 | #endif |
2585 | ||
c5aa993b JM |
2586 | while (ttid > 0) |
2587 | { | |
2588 | if (tstate.tts_event != TTEVT_NONE | |
2589 | && !was_handled (ttid)) | |
2590 | { | |
2591 | /* TTEVT_NONE implies we just stopped it ourselves | |
2592 | * because we're the stop-the-world guys, so it's | |
2593 | * not an event from our point of view. | |
2594 | * | |
2595 | * If "was_handled" is true, this is an event we | |
2596 | * already handled, so don't count it. | |
2597 | * | |
2598 | * Note that we don't count the thread with the | |
2599 | * currently-reported event, as it's already marked | |
2600 | * as handled. | |
2601 | */ | |
2602 | events_left++; | |
2603 | } | |
2604 | ||
c906108c | 2605 | #if defined( THREAD_DEBUG ) || defined( WAIT_BUFFER_DEBUG ) |
c5aa993b JM |
2606 | if (debug_on) |
2607 | { | |
2608 | if (ttid == real_tid) | |
2609 | printf ("*"); /* Thread we're reporting */ | |
2610 | else | |
2611 | printf (" "); | |
2612 | ||
2613 | if (tstate.tts_event != TTEVT_NONE) | |
2614 | printf ("+"); /* Thread with a real event */ | |
2615 | else | |
2616 | printf (" "); | |
2617 | ||
2618 | if (was_handled (ttid)) | |
2619 | printf ("h"); /* Thread has been handled */ | |
2620 | else | |
2621 | printf (" "); | |
2622 | ||
2623 | printf (" %d, with event %s", ttid, | |
2624 | get_printable_name_of_ttrace_event (tstate.tts_event)); | |
2625 | ||
2626 | if (tstate.tts_event == TTEVT_SIGNAL | |
2627 | && 5 == tstate.tts_u.tts_signal.tts_signo) | |
2628 | { | |
2629 | CORE_ADDR pc_val; | |
c906108c | 2630 | |
c5aa993b JM |
2631 | pc_val = get_raw_pc (ttid); |
2632 | ||
2633 | if (pc_val > 0) | |
2634 | printf (" breakpoint at 0x%x\n", pc_val); | |
2635 | else | |
2636 | printf (" bpt, can't fetch pc.\n"); | |
2637 | } | |
2638 | else | |
2639 | printf ("\n"); | |
2640 | } | |
c906108c SS |
2641 | #endif |
2642 | ||
2643 | ttid = get_process_next_stopped_thread_id (real_pid, &tstate); | |
c5aa993b | 2644 | } |
c906108c SS |
2645 | |
2646 | #if defined( THREAD_DEBUG ) || defined( WAIT_BUFFER_DEBUG ) | |
c5aa993b JM |
2647 | if (debug_on) |
2648 | if (events_left > 0) | |
2649 | printf ("There are thus %d pending events\n", events_left); | |
c906108c SS |
2650 | #endif |
2651 | ||
2652 | return events_left; | |
2653 | } | |
2654 | ||
2655 | /* This function is provided as a sop to clients that are calling | |
2656 | * ptrace_wait to wait for a process to stop. (see the | |
2657 | * implementation of child_wait.) Return value is the pid for | |
2658 | * the event that ended the wait. | |
2659 | * | |
2660 | * Note: used by core gdb and so uses the pseudo-pid (really tid). | |
2661 | */ | |
2662 | int | |
2663 | ptrace_wait (pid, status) | |
c5aa993b JM |
2664 | int pid; |
2665 | int *status; | |
c906108c | 2666 | { |
c5aa993b JM |
2667 | ttstate_t tsp; |
2668 | int ttwait_return; | |
2669 | int real_pid; | |
2670 | ttstate_t state; | |
2671 | lwpid_t real_tid; | |
2672 | int return_pid; | |
c906108c SS |
2673 | |
2674 | /* The ptrace implementation of this also ignores pid. | |
2675 | */ | |
2676 | *status = 0; | |
2677 | ||
c5aa993b | 2678 | ttwait_return = call_ttrace_wait (0, TTRACE_WAITOK, &tsp, sizeof (tsp)); |
c906108c SS |
2679 | if (ttwait_return < 0) |
2680 | { | |
2681 | /* ??rehrauer: It appears that if our inferior exits and we | |
2682 | haven't asked for exit events, that we're not getting any | |
2683 | indication save a negative return from ttrace_wait and an | |
2684 | errno set to ESRCH? | |
c5aa993b | 2685 | */ |
c906108c | 2686 | if (errno == ESRCH) |
c5aa993b JM |
2687 | { |
2688 | *status = 0; /* WIFEXITED */ | |
2689 | return inferior_pid; | |
2690 | } | |
c906108c | 2691 | |
c5aa993b JM |
2692 | warning ("Call of ttrace_wait returned with errno %d.", |
2693 | errno); | |
c906108c SS |
2694 | *status = ttwait_return; |
2695 | return inferior_pid; | |
2696 | } | |
2697 | ||
2698 | real_pid = tsp.tts_pid; | |
2699 | real_tid = tsp.tts_lwpid; | |
2700 | ||
2701 | /* One complication is that the "tts_event" structure has | |
2702 | * a set of flags, and more than one can be set. So we | |
2703 | * either have to force an order (as we do here), or handle | |
2704 | * more than one flag at a time. | |
2705 | */ | |
c5aa993b JM |
2706 | if (tsp.tts_event & TTEVT_LWP_CREATE) |
2707 | { | |
2708 | ||
2709 | /* Unlike what you might expect, this event is reported in | |
2710 | * the _creating_ thread, and the _created_ thread (whose tid | |
2711 | * we have) is still running. So we have to stop it. This | |
2712 | * has already been done in "call_ttrace_wait", but should we | |
2713 | * ever abandon the "stop-the-world" model, here's the command | |
2714 | * to use: | |
2715 | * | |
2716 | * call_ttrace( TT_LWP_STOP, real_tid, TT_NIL, TT_NIL, TT_NIL ); | |
2717 | * | |
2718 | * Note that this would depend on being called _after_ "add_tthread" | |
2719 | * below for the tid-to-pid translation to be done in "call_ttrace". | |
2720 | */ | |
c906108c SS |
2721 | |
2722 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2723 | if (debug_on) |
2724 | printf ("New thread: pid %d, tid %d, creator tid %d\n", | |
2725 | real_pid, tsp.tts_u.tts_thread.tts_target_lwpid, | |
2726 | real_tid); | |
c906108c SS |
2727 | #endif |
2728 | ||
c5aa993b JM |
2729 | /* Now we have to return the tid of the created thread, not |
2730 | * the creating thread, or "wait_for_inferior" won't know we | |
2731 | * have a new "process" (thread). Plus we should record it | |
2732 | * right, too. | |
2733 | */ | |
c906108c SS |
2734 | real_tid = tsp.tts_u.tts_thread.tts_target_lwpid; |
2735 | ||
c5aa993b JM |
2736 | add_tthread (real_pid, real_tid); |
2737 | } | |
c906108c | 2738 | |
c5aa993b JM |
2739 | else if ((tsp.tts_event & TTEVT_LWP_TERMINATE) |
2740 | || (tsp.tts_event & TTEVT_LWP_EXIT)) | |
2741 | { | |
c906108c SS |
2742 | |
2743 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2744 | if (debug_on) |
2745 | printf ("Thread dies: %d\n", real_tid); | |
c906108c SS |
2746 | #endif |
2747 | ||
c5aa993b JM |
2748 | del_tthread (real_tid); |
2749 | } | |
c906108c | 2750 | |
c5aa993b JM |
2751 | else if (tsp.tts_event & TTEVT_EXEC) |
2752 | { | |
c906108c | 2753 | |
c5aa993b JM |
2754 | #ifdef THREAD_DEBUG |
2755 | if (debug_on) | |
2756 | printf ("Pid %d has zero'th thread %d; inferior pid is %d\n", | |
2757 | real_pid, real_tid, inferior_pid); | |
c906108c SS |
2758 | #endif |
2759 | ||
c5aa993b JM |
2760 | add_tthread (real_pid, real_tid); |
2761 | } | |
c906108c SS |
2762 | |
2763 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2764 | else if (debug_on) |
2765 | { | |
2766 | printf ("Process-level event %s, using tid %d\n", | |
2767 | get_printable_name_of_ttrace_event (tsp.tts_event), | |
2768 | real_tid); | |
2769 | ||
2770 | /* OK to do this, as "add_tthread" won't add | |
2771 | * duplicate entries. Also OK not to do it, | |
2772 | * as this event isn't one which can change the | |
2773 | * thread state. | |
2774 | */ | |
2775 | add_tthread (real_pid, real_tid); | |
2776 | } | |
c906108c SS |
2777 | #endif |
2778 | ||
2779 | ||
2780 | /* How many events are left to report later? | |
2781 | * In a non-stop-the-world model, this isn't needed. | |
2782 | * | |
2783 | * Note that it's not always safe to query the thread state of a process, | |
2784 | * which is what count_unhandled_events does. (If unsafe, we're left with | |
2785 | * no other resort than to assume that no more events remain...) | |
2786 | */ | |
2787 | if (can_touch_threads_of_process (real_pid, tsp.tts_event)) | |
c5aa993b JM |
2788 | more_events_left = count_unhandled_events (real_pid, real_tid); |
2789 | ||
2790 | else | |
2791 | { | |
2792 | if (more_events_left > 0) | |
2793 | warning ("Vfork or fork causing loss of %d buffered events.", | |
2794 | more_events_left); | |
2795 | ||
c906108c | 2796 | more_events_left = 0; |
c5aa993b | 2797 | } |
c906108c SS |
2798 | |
2799 | /* Attempt to translate the ttrace_wait-returned status into the | |
2800 | ptrace equivalent. | |
2801 | ||
2802 | ??rehrauer: This is somewhat fragile. We really ought to rewrite | |
2803 | clients that expect to pick apart a ptrace wait status, to use | |
2804 | something a little more abstract. | |
c5aa993b JM |
2805 | */ |
2806 | if ((tsp.tts_event & TTEVT_EXEC) | |
c906108c SS |
2807 | || (tsp.tts_event & TTEVT_FORK) |
2808 | || (tsp.tts_event & TTEVT_VFORK)) | |
2809 | { | |
2810 | /* Forks come in pairs (parent and child), so core gdb | |
2811 | * will do two waits. Be ready to notice this. | |
2812 | */ | |
2813 | if (tsp.tts_event & TTEVT_FORK) | |
c5aa993b JM |
2814 | { |
2815 | process_state = FORKING; | |
2816 | ||
c906108c | 2817 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
2818 | if (debug_on) |
2819 | printf ("Process set to FORKING\n"); | |
c906108c | 2820 | #endif |
c5aa993b | 2821 | } |
c906108c | 2822 | else if (tsp.tts_event & TTEVT_VFORK) |
c5aa993b JM |
2823 | { |
2824 | process_state = VFORKING; | |
2825 | ||
c906108c | 2826 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
2827 | if (debug_on) |
2828 | printf ("Process set to VFORKING\n"); | |
c906108c | 2829 | #endif |
c5aa993b | 2830 | } |
c906108c SS |
2831 | |
2832 | /* Make an exec or fork look like a breakpoint. Definitely a hack, | |
2833 | but I don't think non HP-UX-specific clients really carefully | |
2834 | inspect the first events they get after inferior startup, so | |
2835 | it probably almost doesn't matter what we claim this is. | |
c5aa993b | 2836 | */ |
c906108c SS |
2837 | |
2838 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2839 | if (debug_on) |
2840 | printf ("..a process 'event'\n"); | |
c906108c SS |
2841 | #endif |
2842 | ||
2843 | /* Also make fork and exec events look like bpts, so they can be caught. | |
c5aa993b | 2844 | */ |
c906108c SS |
2845 | *status = 0177 | (_SIGTRAP << 8); |
2846 | } | |
2847 | ||
2848 | /* Special-cases: We ask for syscall entry and exit events to implement | |
2849 | "fast" (aka "hardware") watchpoints. | |
2850 | ||
2851 | When we get a syscall entry, we want to disable page-protections, | |
2852 | and resume the inferior; this isn't an event we wish for | |
2853 | wait_for_inferior to see. Note that we must resume ONLY the | |
2854 | thread that reported the syscall entry; we don't want to allow | |
2855 | other threads to run with the page protections off, as they might | |
2856 | then be able to write to watch memory without it being caught. | |
2857 | ||
2858 | When we get a syscall exit, we want to reenable page-protections, | |
2859 | but we don't want to resume the inferior; this is an event we wish | |
2860 | wait_for_inferior to see. Make it look like the signal we normally | |
2861 | get for a single-step completion. This should cause wait_for_inferior | |
2862 | to evaluate whether any watchpoint triggered. | |
2863 | ||
2864 | Or rather, that's what we'd LIKE to do for syscall exit; we can't, | |
2865 | due to some HP-UX "features". Some syscalls have problems with | |
2866 | write-protections on some pages, and some syscalls seem to have | |
2867 | pending writes to those pages at the time we're getting the return | |
2868 | event. So, we'll single-step the inferior to get out of the syscall, | |
2869 | and then reenable protections. | |
2870 | ||
2871 | Note that we're intentionally allowing the syscall exit case to | |
2872 | fall through into the succeeding cases, as sometimes we single- | |
2873 | step out of one syscall only to immediately enter another... | |
2874 | */ | |
2875 | else if ((tsp.tts_event & TTEVT_SYSCALL_ENTRY) | |
c5aa993b | 2876 | || (tsp.tts_event & TTEVT_SYSCALL_RETURN)) |
c906108c SS |
2877 | { |
2878 | /* Make a syscall event look like a breakpoint. Same comments | |
2879 | as for exec & fork events. | |
c5aa993b | 2880 | */ |
c906108c | 2881 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2882 | if (debug_on) |
2883 | printf ("..a syscall 'event'\n"); | |
c906108c SS |
2884 | #endif |
2885 | ||
2886 | /* Also make syscall events look like bpts, so they can be caught. | |
c5aa993b | 2887 | */ |
c906108c SS |
2888 | *status = 0177 | (_SIGTRAP << 8); |
2889 | } | |
2890 | ||
2891 | else if ((tsp.tts_event & TTEVT_LWP_CREATE) | |
c5aa993b JM |
2892 | || (tsp.tts_event & TTEVT_LWP_TERMINATE) |
2893 | || (tsp.tts_event & TTEVT_LWP_EXIT)) | |
c906108c SS |
2894 | { |
2895 | /* Make a thread event look like a breakpoint. Same comments | |
2896 | * as for exec & fork events. | |
2897 | */ | |
2898 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2899 | if (debug_on) |
2900 | printf ("..a thread 'event'\n"); | |
c906108c SS |
2901 | #endif |
2902 | ||
2903 | /* Also make thread events look like bpts, so they can be caught. | |
c5aa993b | 2904 | */ |
c906108c SS |
2905 | *status = 0177 | (_SIGTRAP << 8); |
2906 | } | |
c5aa993b | 2907 | |
c906108c | 2908 | else if ((tsp.tts_event & TTEVT_EXIT)) |
c5aa993b JM |
2909 | { /* WIFEXITED */ |
2910 | ||
c906108c | 2911 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2912 | if (debug_on) |
2913 | printf ("..an exit\n"); | |
c906108c SS |
2914 | #endif |
2915 | ||
2916 | /* Prevent rest of gdb from thinking this is | |
2917 | * a new thread if for some reason it's never | |
2918 | * seen the main thread before. | |
2919 | */ | |
c5aa993b JM |
2920 | inferior_pid = map_to_gdb_tid (real_tid); /* HACK, FIX */ |
2921 | ||
c906108c SS |
2922 | *status = 0 | (tsp.tts_u.tts_exit.tts_exitcode); |
2923 | } | |
c5aa993b | 2924 | |
c906108c | 2925 | else if (tsp.tts_event & TTEVT_SIGNAL) |
c5aa993b | 2926 | { /* WIFSTOPPED */ |
c906108c | 2927 | #ifdef THREAD_DEBUG |
c5aa993b JM |
2928 | if (debug_on) |
2929 | printf ("..a signal, %d\n", tsp.tts_u.tts_signal.tts_signo); | |
c906108c SS |
2930 | #endif |
2931 | ||
2932 | *status = 0177 | (tsp.tts_u.tts_signal.tts_signo << 8); | |
2933 | } | |
2934 | ||
2935 | else | |
c5aa993b | 2936 | { /* !WIFSTOPPED */ |
c906108c SS |
2937 | |
2938 | /* This means the process or thread terminated. But we should've | |
2939 | caught an explicit exit/termination above. So warn (this is | |
2940 | really an internal error) and claim the process or thread | |
2941 | terminated with a SIGTRAP. | |
2942 | */ | |
2943 | ||
2944 | warning ("process_wait: unknown process state"); | |
2945 | ||
2946 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2947 | if (debug_on) |
2948 | printf ("Process-level event %s, using tid %d\n", | |
2949 | get_printable_name_of_ttrace_event (tsp.tts_event), | |
2950 | real_tid); | |
c906108c SS |
2951 | #endif |
2952 | ||
2953 | *status = _SIGTRAP; | |
2954 | } | |
2955 | ||
2956 | target_post_wait (tsp.tts_pid, *status); | |
2957 | ||
2958 | ||
2959 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
2960 | if (debug_on) |
2961 | printf ("Done waiting, pid is %d, tid %d\n", real_pid, real_tid); | |
c906108c SS |
2962 | #endif |
2963 | ||
2964 | /* All code external to this module uses the tid, but calls | |
2965 | * it "pid". There's some tweaking so that the outside sees | |
2966 | * the first thread as having the same number as the starting | |
2967 | * pid. | |
2968 | */ | |
c5aa993b | 2969 | return_pid = map_to_gdb_tid (real_tid); |
c906108c SS |
2970 | |
2971 | /* Remember this for later use in "hppa_prepare_to_proceed". | |
2972 | */ | |
c5aa993b | 2973 | old_gdb_pid = inferior_pid; |
c906108c SS |
2974 | reported_pid = return_pid; |
2975 | reported_bpt = ((tsp.tts_event & TTEVT_SIGNAL) && (5 == tsp.tts_u.tts_signal.tts_signo)); | |
2976 | ||
c5aa993b JM |
2977 | if (real_tid == 0 || return_pid == 0) |
2978 | { | |
2979 | warning ("Internal error: process-wait failed."); | |
2980 | } | |
2981 | ||
c906108c SS |
2982 | return return_pid; |
2983 | } | |
c906108c | 2984 | \f |
c5aa993b | 2985 | |
c906108c SS |
2986 | /* This function causes the caller's process to be traced by its |
2987 | parent. This is intended to be called after GDB forks itself, | |
2988 | and before the child execs the target. Despite the name, it | |
2989 | is called by the child. | |
2990 | ||
2991 | Note that HP-UX ttrace is rather funky in how this is done. | |
2992 | If the parent wants to get the initial exec event of a child, | |
2993 | it must set the ttrace event mask of the child to include execs. | |
2994 | (The child cannot do this itself.) This must be done after the | |
2995 | child is forked, but before it execs. | |
2996 | ||
2997 | To coordinate the parent and child, we implement a semaphore using | |
2998 | pipes. After SETTRC'ing itself, the child tells the parent that | |
2999 | it is now traceable by the parent, and waits for the parent's | |
3000 | acknowledgement. The parent can then set the child's event mask, | |
3001 | and notify the child that it can now exec. | |
3002 | ||
3003 | (The acknowledgement by parent happens as a result of a call to | |
3004 | child_acknowledge_created_inferior.) | |
3005 | */ | |
3006 | int | |
3007 | parent_attach_all () | |
3008 | { | |
c5aa993b | 3009 | int tt_status; |
c906108c SS |
3010 | |
3011 | /* We need a memory home for a constant, to pass it to ttrace. | |
3012 | The value of the constant is arbitrary, so long as both | |
3013 | parent and child use the same value. Might as well use the | |
3014 | "magic" constant provided by ttrace... | |
3015 | */ | |
c5aa993b JM |
3016 | uint64_t tc_magic_child = TT_VERSION; |
3017 | uint64_t tc_magic_parent = 0; | |
c906108c SS |
3018 | |
3019 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
3020 | TT_PROC_SETTRC, |
3021 | (int) TT_NIL, | |
3022 | (lwpid_t) TT_NIL, | |
3023 | TT_NIL, | |
3024 | (TTRACE_ARG_TYPE) TT_VERSION, | |
3025 | TT_NIL); | |
c906108c SS |
3026 | |
3027 | if (tt_status < 0) | |
3028 | return tt_status; | |
3029 | ||
3030 | /* Notify the parent that we're potentially ready to exec(). */ | |
3031 | write (startup_semaphore.child_channel[SEM_TALK], | |
c5aa993b JM |
3032 | &tc_magic_child, |
3033 | sizeof (tc_magic_child)); | |
c906108c SS |
3034 | |
3035 | /* Wait for acknowledgement from the parent. */ | |
3036 | read (startup_semaphore.parent_channel[SEM_LISTEN], | |
c5aa993b JM |
3037 | &tc_magic_parent, |
3038 | sizeof (tc_magic_parent)); | |
3039 | ||
c906108c SS |
3040 | if (tc_magic_child != tc_magic_parent) |
3041 | warning ("mismatched semaphore magic"); | |
3042 | ||
3043 | /* Discard our copy of the semaphore. */ | |
3044 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
3045 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
3046 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
3047 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
c5aa993b | 3048 | |
c906108c SS |
3049 | return tt_status; |
3050 | } | |
3051 | ||
3052 | /* Despite being file-local, this routine is dealing with | |
3053 | * actual process IDs, not thread ids. That's because it's | |
3054 | * called before the first "wait" call, and there's no map | |
3055 | * yet from tids to pids. | |
3056 | * | |
3057 | * When it is called, a forked child is running, but waiting on | |
3058 | * the semaphore. If you stop the child and re-start it, | |
3059 | * things get confused, so don't do that! An attached child is | |
3060 | * stopped. | |
3061 | * | |
3062 | * Since this is called after either attach or run, we | |
3063 | * have to be the common part of both. | |
3064 | */ | |
3065 | static void | |
c5aa993b JM |
3066 | require_notification_of_events (real_pid) |
3067 | int real_pid; | |
c906108c | 3068 | { |
c5aa993b JM |
3069 | int tt_status; |
3070 | ttevent_t notifiable_events; | |
c906108c | 3071 | |
c5aa993b JM |
3072 | lwpid_t tid; |
3073 | ttstate_t thread_state; | |
c906108c SS |
3074 | |
3075 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3076 | if (debug_on) |
3077 | printf ("Require notif, pid is %d\n", real_pid); | |
c906108c SS |
3078 | #endif |
3079 | ||
3080 | /* Temporary HACK: tell inftarg.c/child_wait to not | |
3081 | * loop until pids are the same. | |
3082 | */ | |
3083 | not_same_real_pid = 0; | |
3084 | ||
3085 | sigemptyset (¬ifiable_events.tte_signals); | |
3086 | notifiable_events.tte_opts = TTEO_NONE; | |
3087 | ||
3088 | /* This ensures that forked children inherit their parent's | |
3089 | * event mask, which we're setting here. | |
3090 | * | |
3091 | * NOTE: if you debug gdb with itself, then the ultimate | |
3092 | * debuggee gets flags set by the outermost gdb, as | |
3093 | * a child of a child will still inherit. | |
3094 | */ | |
3095 | notifiable_events.tte_opts |= TTEO_PROC_INHERIT; | |
3096 | ||
c5aa993b | 3097 | notifiable_events.tte_events = TTEVT_DEFAULT; |
c906108c SS |
3098 | notifiable_events.tte_events |= TTEVT_SIGNAL; |
3099 | notifiable_events.tte_events |= TTEVT_EXEC; | |
3100 | notifiable_events.tte_events |= TTEVT_EXIT; | |
3101 | notifiable_events.tte_events |= TTEVT_FORK; | |
3102 | notifiable_events.tte_events |= TTEVT_VFORK; | |
3103 | notifiable_events.tte_events |= TTEVT_LWP_CREATE; | |
3104 | notifiable_events.tte_events |= TTEVT_LWP_EXIT; | |
3105 | notifiable_events.tte_events |= TTEVT_LWP_TERMINATE; | |
3106 | ||
3107 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
3108 | TT_PROC_SET_EVENT_MASK, |
3109 | real_pid, | |
3110 | (lwpid_t) TT_NIL, | |
3111 | (TTRACE_ARG_TYPE) & notifiable_events, | |
3112 | (TTRACE_ARG_TYPE) sizeof (notifiable_events), | |
3113 | TT_NIL); | |
c906108c SS |
3114 | } |
3115 | ||
3116 | static void | |
c5aa993b JM |
3117 | require_notification_of_exec_events (real_pid) |
3118 | int real_pid; | |
c906108c | 3119 | { |
c5aa993b JM |
3120 | int tt_status; |
3121 | ttevent_t notifiable_events; | |
c906108c | 3122 | |
c5aa993b JM |
3123 | lwpid_t tid; |
3124 | ttstate_t thread_state; | |
c906108c SS |
3125 | |
3126 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3127 | if (debug_on) |
3128 | printf ("Require notif, pid is %d\n", real_pid); | |
c906108c SS |
3129 | #endif |
3130 | ||
3131 | /* Temporary HACK: tell inftarg.c/child_wait to not | |
3132 | * loop until pids are the same. | |
3133 | */ | |
3134 | not_same_real_pid = 0; | |
3135 | ||
3136 | sigemptyset (¬ifiable_events.tte_signals); | |
3137 | notifiable_events.tte_opts = TTEO_NOSTRCCHLD; | |
3138 | ||
3139 | /* This ensures that forked children don't inherit their parent's | |
3140 | * event mask, which we're setting here. | |
3141 | */ | |
3142 | notifiable_events.tte_opts &= ~TTEO_PROC_INHERIT; | |
3143 | ||
c5aa993b | 3144 | notifiable_events.tte_events = TTEVT_DEFAULT; |
c906108c SS |
3145 | notifiable_events.tte_events |= TTEVT_EXEC; |
3146 | notifiable_events.tte_events |= TTEVT_EXIT; | |
3147 | ||
3148 | tt_status = call_real_ttrace ( | |
c5aa993b JM |
3149 | TT_PROC_SET_EVENT_MASK, |
3150 | real_pid, | |
3151 | (lwpid_t) TT_NIL, | |
3152 | (TTRACE_ARG_TYPE) & notifiable_events, | |
3153 | (TTRACE_ARG_TYPE) sizeof (notifiable_events), | |
3154 | TT_NIL); | |
c906108c | 3155 | } |
c906108c | 3156 | \f |
c5aa993b | 3157 | |
c906108c SS |
3158 | /* This function is called by the parent process, with pid being the |
3159 | * ID of the child process, after the debugger has forked. | |
3160 | */ | |
3161 | void | |
3162 | child_acknowledge_created_inferior (pid) | |
c5aa993b | 3163 | int pid; |
c906108c SS |
3164 | { |
3165 | /* We need a memory home for a constant, to pass it to ttrace. | |
3166 | The value of the constant is arbitrary, so long as both | |
3167 | parent and child use the same value. Might as well use the | |
3168 | "magic" constant provided by ttrace... | |
c5aa993b JM |
3169 | */ |
3170 | uint64_t tc_magic_parent = TT_VERSION; | |
3171 | uint64_t tc_magic_child = 0; | |
c906108c SS |
3172 | |
3173 | /* Wait for the child to tell us that it has forked. */ | |
3174 | read (startup_semaphore.child_channel[SEM_LISTEN], | |
c5aa993b JM |
3175 | &tc_magic_child, |
3176 | sizeof (tc_magic_child)); | |
c906108c SS |
3177 | |
3178 | /* Clear thread info now. We'd like to do this in | |
3179 | * "require...", but that messes up attach. | |
3180 | */ | |
c5aa993b | 3181 | clear_thread_info (); |
c906108c SS |
3182 | |
3183 | /* Tell the "rest of gdb" that the initial thread exists. | |
3184 | * This isn't really a hack. Other thread-based versions | |
3185 | * of gdb (e.g. gnu-nat.c) seem to do the same thing. | |
3186 | * | |
3187 | * Q: Why don't we also add this thread to the local | |
3188 | * list via "add_tthread"? | |
3189 | * | |
3190 | * A: Because we don't know the tid, and can't stop the | |
3191 | * the process safely to ask what it is. Anyway, we'll | |
3192 | * add it when it gets the EXEC event. | |
3193 | */ | |
c5aa993b | 3194 | add_thread (pid); /* in thread.c */ |
c906108c SS |
3195 | |
3196 | /* We can now set the child's ttrace event mask. | |
3197 | */ | |
3198 | require_notification_of_exec_events (pid); | |
3199 | ||
3200 | /* Tell ourselves that the process is running. | |
3201 | */ | |
3202 | process_state = RUNNING; | |
3203 | ||
3204 | /* Notify the child that it can exec. */ | |
3205 | write (startup_semaphore.parent_channel[SEM_TALK], | |
c5aa993b JM |
3206 | &tc_magic_parent, |
3207 | sizeof (tc_magic_parent)); | |
c906108c SS |
3208 | |
3209 | /* Discard our copy of the semaphore. */ | |
3210 | (void) close (startup_semaphore.parent_channel[SEM_LISTEN]); | |
3211 | (void) close (startup_semaphore.parent_channel[SEM_TALK]); | |
3212 | (void) close (startup_semaphore.child_channel[SEM_LISTEN]); | |
3213 | (void) close (startup_semaphore.child_channel[SEM_TALK]); | |
3214 | } | |
3215 | ||
3216 | ||
3217 | /* | |
3218 | * arrange for notification of all events by | |
3219 | * calling require_notification_of_events. | |
3220 | */ | |
3221 | void | |
c5aa993b JM |
3222 | child_post_startup_inferior (real_pid) |
3223 | int real_pid; | |
c906108c SS |
3224 | { |
3225 | require_notification_of_events (real_pid); | |
3226 | } | |
3227 | ||
3228 | /* From here on, we should expect tids rather than pids. | |
3229 | */ | |
3230 | static void | |
3231 | hppa_enable_catch_fork (tid) | |
c5aa993b | 3232 | int tid; |
c906108c | 3233 | { |
c5aa993b JM |
3234 | int tt_status; |
3235 | ttevent_t ttrace_events; | |
c906108c SS |
3236 | |
3237 | /* Get the set of events that are currently enabled. | |
3238 | */ | |
3239 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3240 | tid, |
3241 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3242 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3243 | TT_NIL); | |
c906108c SS |
3244 | if (errno) |
3245 | perror_with_name ("ttrace"); | |
3246 | ||
3247 | /* Add forks to that set. */ | |
3248 | ttrace_events.tte_events |= TTEVT_FORK; | |
3249 | ||
3250 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3251 | if (debug_on) |
3252 | printf ("enable fork, tid is %d\n", tid); | |
c906108c SS |
3253 | #endif |
3254 | ||
3255 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3256 | tid, |
3257 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3258 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3259 | TT_NIL); | |
c906108c SS |
3260 | if (errno) |
3261 | perror_with_name ("ttrace"); | |
3262 | } | |
3263 | ||
3264 | ||
3265 | static void | |
3266 | hppa_disable_catch_fork (tid) | |
c5aa993b | 3267 | int tid; |
c906108c | 3268 | { |
c5aa993b JM |
3269 | int tt_status; |
3270 | ttevent_t ttrace_events; | |
c906108c SS |
3271 | |
3272 | /* Get the set of events that are currently enabled. | |
3273 | */ | |
3274 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3275 | tid, |
3276 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3277 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3278 | TT_NIL); | |
c906108c SS |
3279 | |
3280 | if (errno) | |
3281 | perror_with_name ("ttrace"); | |
3282 | ||
3283 | /* Remove forks from that set. */ | |
3284 | ttrace_events.tte_events &= ~TTEVT_FORK; | |
3285 | ||
3286 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3287 | if (debug_on) |
3288 | printf ("disable fork, tid is %d\n", tid); | |
c906108c SS |
3289 | #endif |
3290 | ||
3291 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3292 | tid, |
3293 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3294 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3295 | TT_NIL); | |
c906108c SS |
3296 | |
3297 | if (errno) | |
3298 | perror_with_name ("ttrace"); | |
3299 | } | |
3300 | ||
3301 | ||
3302 | #if defined(CHILD_INSERT_FORK_CATCHPOINT) | |
3303 | int | |
3304 | child_insert_fork_catchpoint (tid) | |
c5aa993b | 3305 | int tid; |
c906108c SS |
3306 | { |
3307 | /* Enable reporting of fork events from the kernel. */ | |
3308 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3309 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3310 | */ |
c906108c SS |
3311 | return 0; |
3312 | } | |
3313 | #endif | |
3314 | ||
3315 | ||
3316 | #if defined(CHILD_REMOVE_FORK_CATCHPOINT) | |
3317 | int | |
3318 | child_remove_fork_catchpoint (tid) | |
c5aa993b | 3319 | int tid; |
c906108c SS |
3320 | { |
3321 | /* Disable reporting of fork events from the kernel. */ | |
3322 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3323 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3324 | */ |
c906108c SS |
3325 | return 0; |
3326 | } | |
3327 | #endif | |
3328 | ||
3329 | ||
3330 | static void | |
3331 | hppa_enable_catch_vfork (tid) | |
c5aa993b | 3332 | int tid; |
c906108c | 3333 | { |
c5aa993b JM |
3334 | int tt_status; |
3335 | ttevent_t ttrace_events; | |
c906108c SS |
3336 | |
3337 | /* Get the set of events that are currently enabled. | |
3338 | */ | |
3339 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3340 | tid, |
3341 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3342 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3343 | TT_NIL); | |
c906108c SS |
3344 | |
3345 | if (errno) | |
3346 | perror_with_name ("ttrace"); | |
3347 | ||
3348 | /* Add vforks to that set. */ | |
3349 | ttrace_events.tte_events |= TTEVT_VFORK; | |
3350 | ||
3351 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3352 | if (debug_on) |
3353 | printf ("enable vfork, tid is %d\n", tid); | |
c906108c SS |
3354 | #endif |
3355 | ||
3356 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3357 | tid, |
3358 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3359 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3360 | TT_NIL); | |
c906108c SS |
3361 | |
3362 | if (errno) | |
3363 | perror_with_name ("ttrace"); | |
3364 | } | |
3365 | ||
3366 | ||
3367 | static void | |
3368 | hppa_disable_catch_vfork (tid) | |
c5aa993b | 3369 | int tid; |
c906108c | 3370 | { |
c5aa993b JM |
3371 | int tt_status; |
3372 | ttevent_t ttrace_events; | |
c906108c SS |
3373 | |
3374 | /* Get the set of events that are currently enabled. */ | |
3375 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
3376 | tid, |
3377 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3378 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3379 | TT_NIL); | |
c906108c SS |
3380 | |
3381 | if (errno) | |
3382 | perror_with_name ("ttrace"); | |
3383 | ||
3384 | /* Remove vforks from that set. */ | |
3385 | ttrace_events.tte_events &= ~TTEVT_VFORK; | |
3386 | ||
3387 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
3388 | if (debug_on) |
3389 | printf ("disable vfork, tid is %d\n", tid); | |
c906108c SS |
3390 | #endif |
3391 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
3392 | tid, |
3393 | (TTRACE_ARG_TYPE) & ttrace_events, | |
3394 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
3395 | TT_NIL); | |
c906108c SS |
3396 | |
3397 | if (errno) | |
3398 | perror_with_name ("ttrace"); | |
3399 | } | |
3400 | ||
3401 | ||
3402 | #if defined(CHILD_INSERT_VFORK_CATCHPOINT) | |
3403 | int | |
3404 | child_insert_vfork_catchpoint (tid) | |
c5aa993b | 3405 | int tid; |
c906108c SS |
3406 | { |
3407 | /* Enable reporting of vfork events from the kernel. */ | |
3408 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3409 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3410 | */ |
c906108c SS |
3411 | return 0; |
3412 | } | |
3413 | #endif | |
3414 | ||
3415 | ||
3416 | #if defined(CHILD_REMOVE_VFORK_CATCHPOINT) | |
3417 | int | |
3418 | child_remove_vfork_catchpoint (tid) | |
c5aa993b | 3419 | int tid; |
c906108c SS |
3420 | { |
3421 | /* Disable reporting of vfork events from the kernel. */ | |
3422 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3423 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3424 | */ |
c906108c SS |
3425 | return 0; |
3426 | } | |
3427 | #endif | |
3428 | ||
3429 | #if defined(CHILD_HAS_FORKED) | |
3430 | ||
3431 | /* Q: Do we need to map the returned process ID to a thread ID? | |
c5aa993b | 3432 | |
c906108c SS |
3433 | * A: I don't think so--here we want a _real_ pid. Any later |
3434 | * operations will call "require_notification_of_events" and | |
3435 | * start the mapping. | |
3436 | */ | |
3437 | int | |
3438 | child_has_forked (tid, childpid) | |
c5aa993b JM |
3439 | int tid; |
3440 | int *childpid; | |
c906108c | 3441 | { |
c5aa993b JM |
3442 | int tt_status; |
3443 | ttstate_t ttrace_state; | |
3444 | thread_info *tinfo; | |
c906108c SS |
3445 | |
3446 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3447 | tinfo = find_thread_info (map_from_gdb_tid (tid)); | |
c5aa993b JM |
3448 | if (tinfo != NULL) |
3449 | { | |
3450 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3451 | } | |
c906108c SS |
3452 | |
3453 | /* Nope, must read the thread's current state */ | |
3454 | else | |
3455 | { | |
3456 | tt_status = call_ttrace (TT_LWP_GET_STATE, | |
c5aa993b JM |
3457 | tid, |
3458 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3459 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3460 | TT_NIL); | |
c906108c SS |
3461 | |
3462 | if (errno) | |
c5aa993b JM |
3463 | perror_with_name ("ttrace"); |
3464 | ||
c906108c | 3465 | if (tt_status < 0) |
c5aa993b | 3466 | return 0; |
c906108c SS |
3467 | } |
3468 | ||
3469 | if (ttrace_state.tts_event & TTEVT_FORK) | |
3470 | { | |
3471 | *childpid = ttrace_state.tts_u.tts_fork.tts_fpid; | |
3472 | return 1; | |
3473 | } | |
3474 | ||
3475 | return 0; | |
3476 | } | |
3477 | #endif | |
3478 | ||
3479 | ||
3480 | #if defined(CHILD_HAS_VFORKED) | |
3481 | ||
3482 | /* See child_has_forked for pid discussion. | |
3483 | */ | |
3484 | int | |
3485 | child_has_vforked (tid, childpid) | |
c5aa993b JM |
3486 | int tid; |
3487 | int *childpid; | |
c906108c | 3488 | { |
c5aa993b JM |
3489 | int tt_status; |
3490 | ttstate_t ttrace_state; | |
3491 | thread_info *tinfo; | |
c906108c SS |
3492 | |
3493 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3494 | tinfo = find_thread_info (map_from_gdb_tid (tid)); | |
3495 | if (tinfo != NULL) | |
3496 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3497 | ||
3498 | /* Nope, must read the thread's current state */ | |
3499 | else | |
3500 | { | |
3501 | tt_status = call_ttrace (TT_LWP_GET_STATE, | |
c5aa993b JM |
3502 | tid, |
3503 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3504 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3505 | TT_NIL); | |
c906108c SS |
3506 | |
3507 | if (errno) | |
c5aa993b JM |
3508 | perror_with_name ("ttrace"); |
3509 | ||
c906108c | 3510 | if (tt_status < 0) |
c5aa993b | 3511 | return 0; |
c906108c SS |
3512 | } |
3513 | ||
3514 | if (ttrace_state.tts_event & TTEVT_VFORK) | |
3515 | { | |
3516 | *childpid = ttrace_state.tts_u.tts_fork.tts_fpid; | |
3517 | return 1; | |
3518 | } | |
3519 | ||
3520 | return 0; | |
3521 | } | |
3522 | #endif | |
3523 | ||
3524 | ||
3525 | #if defined(CHILD_CAN_FOLLOW_VFORK_PRIOR_TO_EXEC) | |
3526 | int | |
3527 | child_can_follow_vfork_prior_to_exec () | |
3528 | { | |
3529 | /* ttrace does allow this. | |
3530 | ||
3531 | ??rehrauer: However, I had major-league problems trying to | |
3532 | convince wait_for_inferior to handle that case. Perhaps when | |
3533 | it is rewritten to grok multiple processes in an explicit way... | |
c5aa993b | 3534 | */ |
c906108c SS |
3535 | return 0; |
3536 | } | |
3537 | #endif | |
3538 | ||
3539 | ||
3540 | #if defined(CHILD_INSERT_EXEC_CATCHPOINT) | |
3541 | int | |
3542 | child_insert_exec_catchpoint (tid) | |
c5aa993b | 3543 | int tid; |
c906108c SS |
3544 | { |
3545 | /* Enable reporting of exec events from the kernel. */ | |
3546 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3547 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3548 | */ |
c906108c SS |
3549 | return 0; |
3550 | } | |
3551 | #endif | |
3552 | ||
3553 | ||
3554 | #if defined(CHILD_REMOVE_EXEC_CATCHPOINT) | |
3555 | int | |
3556 | child_remove_exec_catchpoint (tid) | |
c5aa993b | 3557 | int tid; |
c906108c SS |
3558 | { |
3559 | /* Disable reporting of execevents from the kernel. */ | |
3560 | /* ??rehrauer: For the moment, we're always enabling these events, | |
3561 | and just ignoring them if there's no catchpoint to catch them. | |
c5aa993b | 3562 | */ |
c906108c SS |
3563 | return 0; |
3564 | } | |
3565 | #endif | |
3566 | ||
3567 | ||
3568 | #if defined(CHILD_HAS_EXECD) | |
3569 | int | |
3570 | child_has_execd (tid, execd_pathname) | |
c5aa993b JM |
3571 | int tid; |
3572 | char **execd_pathname; | |
c906108c | 3573 | { |
c5aa993b JM |
3574 | int tt_status; |
3575 | ttstate_t ttrace_state; | |
3576 | thread_info *tinfo; | |
c906108c SS |
3577 | |
3578 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3579 | tinfo = find_thread_info (map_from_gdb_tid (tid)); | |
3580 | if (tinfo != NULL) | |
3581 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3582 | ||
3583 | /* Nope, must read the thread's current state */ | |
3584 | else | |
3585 | { | |
3586 | tt_status = call_ttrace (TT_LWP_GET_STATE, | |
c5aa993b JM |
3587 | tid, |
3588 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3589 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3590 | TT_NIL); | |
c906108c SS |
3591 | |
3592 | if (errno) | |
c5aa993b JM |
3593 | perror_with_name ("ttrace"); |
3594 | ||
c906108c | 3595 | if (tt_status < 0) |
c5aa993b | 3596 | return 0; |
c906108c SS |
3597 | } |
3598 | ||
3599 | if (ttrace_state.tts_event & TTEVT_EXEC) | |
3600 | { | |
3601 | /* See child_pid_to_exec_file in this file: this is a macro. | |
3602 | */ | |
c5aa993b JM |
3603 | char *exec_file = target_pid_to_exec_file (tid); |
3604 | ||
c906108c SS |
3605 | *execd_pathname = savestring (exec_file, strlen (exec_file)); |
3606 | return 1; | |
3607 | } | |
3608 | ||
3609 | return 0; | |
3610 | } | |
3611 | #endif | |
3612 | ||
3613 | ||
3614 | #if defined(CHILD_HAS_SYSCALL_EVENT) | |
3615 | int | |
3616 | child_has_syscall_event (pid, kind, syscall_id) | |
c5aa993b JM |
3617 | int pid; |
3618 | enum target_waitkind *kind; | |
3619 | int *syscall_id; | |
c906108c | 3620 | { |
c5aa993b JM |
3621 | int tt_status; |
3622 | ttstate_t ttrace_state; | |
3623 | thread_info *tinfo; | |
c906108c SS |
3624 | |
3625 | /* Do we have cached thread state that we can consult? If so, use it. */ | |
3626 | tinfo = find_thread_info (map_from_gdb_tid (pid)); | |
3627 | if (tinfo != NULL) | |
3628 | copy_ttstate_t (&ttrace_state, &tinfo->last_stop_state); | |
3629 | ||
3630 | /* Nope, must read the thread's current state */ | |
3631 | else | |
3632 | { | |
c5aa993b JM |
3633 | tt_status = call_ttrace (TT_LWP_GET_STATE, |
3634 | pid, | |
3635 | (TTRACE_ARG_TYPE) & ttrace_state, | |
3636 | (TTRACE_ARG_TYPE) sizeof (ttrace_state), | |
3637 | TT_NIL); | |
c906108c SS |
3638 | |
3639 | if (errno) | |
c5aa993b JM |
3640 | perror_with_name ("ttrace"); |
3641 | ||
c906108c | 3642 | if (tt_status < 0) |
c5aa993b | 3643 | return 0; |
c906108c SS |
3644 | } |
3645 | ||
c5aa993b | 3646 | *kind = TARGET_WAITKIND_SPURIOUS; /* Until proven otherwise... */ |
c906108c SS |
3647 | *syscall_id = -1; |
3648 | ||
3649 | if (ttrace_state.tts_event & TTEVT_SYSCALL_ENTRY) | |
3650 | *kind = TARGET_WAITKIND_SYSCALL_ENTRY; | |
3651 | else if (ttrace_state.tts_event & TTEVT_SYSCALL_RETURN) | |
3652 | *kind = TARGET_WAITKIND_SYSCALL_RETURN; | |
3653 | else | |
3654 | return 0; | |
3655 | ||
3656 | *syscall_id = ttrace_state.tts_scno; | |
3657 | return 1; | |
3658 | } | |
3659 | #endif | |
c5aa993b | 3660 | \f |
c906108c SS |
3661 | |
3662 | ||
c906108c SS |
3663 | #if defined(CHILD_THREAD_ALIVE) |
3664 | ||
3665 | /* Check to see if the given thread is alive. | |
c5aa993b | 3666 | |
c906108c SS |
3667 | * We'll trust the thread list, as the more correct |
3668 | * approach of stopping the process and spinning down | |
3669 | * the OS's thread list is _very_ expensive. | |
3670 | * | |
3671 | * May need a FIXME for that reason. | |
3672 | */ | |
3673 | int | |
3674 | child_thread_alive (gdb_tid) | |
3675 | lwpid_t gdb_tid; | |
3676 | { | |
c5aa993b | 3677 | lwpid_t tid; |
c906108c | 3678 | |
c5aa993b JM |
3679 | /* This spins down the lists twice. |
3680 | * Possible peformance improvement here! | |
3681 | */ | |
3682 | tid = map_from_gdb_tid (gdb_tid); | |
3683 | return !is_terminated (tid); | |
c906108c SS |
3684 | } |
3685 | ||
3686 | #endif | |
c5aa993b | 3687 | \f |
c906108c SS |
3688 | |
3689 | ||
c906108c SS |
3690 | /* This function attempts to read the specified number of bytes from the |
3691 | save_state_t that is our view into the hardware registers, starting at | |
3692 | ss_offset, and ending at ss_offset + sizeof_buf - 1 | |
3693 | ||
3694 | If this function succeeds, it deposits the fetched bytes into buf, | |
3695 | and returns 0. | |
3696 | ||
3697 | If it fails, it returns a negative result. The contents of buf are | |
3698 | undefined it this function fails. | |
c5aa993b | 3699 | */ |
c906108c SS |
3700 | int |
3701 | read_from_register_save_state (tid, ss_offset, buf, sizeof_buf) | |
c5aa993b JM |
3702 | int tid; |
3703 | TTRACE_ARG_TYPE ss_offset; | |
3704 | char *buf; | |
3705 | int sizeof_buf; | |
c906108c | 3706 | { |
c5aa993b JM |
3707 | int tt_status; |
3708 | register_value_t register_value = 0; | |
c906108c SS |
3709 | |
3710 | tt_status = call_ttrace (TT_LWP_RUREGS, | |
c5aa993b JM |
3711 | tid, |
3712 | ss_offset, | |
3713 | (TTRACE_ARG_TYPE) sizeof_buf, | |
3714 | (TTRACE_ARG_TYPE) buf); | |
3715 | ||
3716 | if (tt_status == 1) | |
3717 | /* Map ttrace's version of success to our version. | |
3718 | * Sometime ttrace returns 0, but that's ok here. | |
3719 | */ | |
3720 | return 0; | |
3721 | ||
c906108c SS |
3722 | return tt_status; |
3723 | } | |
c906108c | 3724 | \f |
c5aa993b | 3725 | |
c906108c SS |
3726 | /* This function attempts to write the specified number of bytes to the |
3727 | save_state_t that is our view into the hardware registers, starting at | |
3728 | ss_offset, and ending at ss_offset + sizeof_buf - 1 | |
3729 | ||
3730 | If this function succeeds, it deposits the bytes in buf, and returns 0. | |
3731 | ||
3732 | If it fails, it returns a negative result. The contents of the save_state_t | |
3733 | are undefined it this function fails. | |
c5aa993b | 3734 | */ |
c906108c SS |
3735 | int |
3736 | write_to_register_save_state (tid, ss_offset, buf, sizeof_buf) | |
c5aa993b JM |
3737 | int tid; |
3738 | TTRACE_ARG_TYPE ss_offset; | |
3739 | char *buf; | |
3740 | int sizeof_buf; | |
c906108c | 3741 | { |
c5aa993b JM |
3742 | int tt_status; |
3743 | register_value_t register_value = 0; | |
c906108c SS |
3744 | |
3745 | tt_status = call_ttrace (TT_LWP_WUREGS, | |
c5aa993b JM |
3746 | tid, |
3747 | ss_offset, | |
3748 | (TTRACE_ARG_TYPE) sizeof_buf, | |
3749 | (TTRACE_ARG_TYPE) buf); | |
c906108c SS |
3750 | return tt_status; |
3751 | } | |
c906108c | 3752 | \f |
c5aa993b | 3753 | |
c906108c SS |
3754 | /* This function is a sop to the largeish number of direct calls |
3755 | to call_ptrace that exist in other files. Rather than create | |
3756 | functions whose name abstracts away from ptrace, and change all | |
3757 | the present callers of call_ptrace, we'll do the expedient (and | |
3758 | perhaps only practical) thing. | |
3759 | ||
3760 | Note HP-UX explicitly disallows a mix of ptrace & ttrace on a traced | |
3761 | process. Thus, we must translate all ptrace requests into their | |
3762 | process-specific, ttrace equivalents. | |
c5aa993b | 3763 | */ |
c906108c SS |
3764 | int |
3765 | call_ptrace (pt_request, gdb_tid, addr, data) | |
c5aa993b JM |
3766 | int pt_request; |
3767 | int gdb_tid; | |
3768 | PTRACE_ARG3_TYPE addr; | |
3769 | int data; | |
c906108c | 3770 | { |
c5aa993b JM |
3771 | ttreq_t tt_request; |
3772 | TTRACE_ARG_TYPE tt_addr = (TTRACE_ARG_TYPE) addr; | |
3773 | TTRACE_ARG_TYPE tt_data = (TTRACE_ARG_TYPE) data; | |
3774 | TTRACE_ARG_TYPE tt_addr2 = TT_NIL; | |
3775 | int tt_status; | |
3776 | register_value_t register_value; | |
3777 | int read_buf; | |
c906108c SS |
3778 | |
3779 | /* Perform the necessary argument translation. Note that some | |
3780 | cases are funky enough in the ttrace realm that we handle them | |
3781 | very specially. | |
3782 | */ | |
c5aa993b JM |
3783 | switch (pt_request) |
3784 | { | |
c906108c SS |
3785 | /* The following cases cannot conveniently be handled conveniently |
3786 | by merely adjusting the ptrace arguments and feeding into the | |
3787 | generic call to ttrace at the bottom of this function. | |
3788 | ||
3789 | Note that because all branches of this switch end in "return", | |
3790 | there's no need for any "break" statements. | |
c5aa993b JM |
3791 | */ |
3792 | case PT_SETTRC: | |
3793 | return parent_attach_all (); | |
3794 | ||
3795 | case PT_RUREGS: | |
3796 | tt_status = read_from_register_save_state (gdb_tid, | |
3797 | tt_addr, | |
3798 | ®ister_value, | |
3799 | sizeof (register_value)); | |
3800 | if (tt_status < 0) | |
3801 | return tt_status; | |
3802 | return register_value; | |
3803 | ||
3804 | case PT_WUREGS: | |
3805 | register_value = (int) tt_data; | |
3806 | tt_status = write_to_register_save_state (gdb_tid, | |
3807 | tt_addr, | |
3808 | ®ister_value, | |
3809 | sizeof (register_value)); | |
3810 | return tt_status; | |
3811 | break; | |
3812 | ||
3813 | case PT_READ_I: | |
3814 | tt_status = call_ttrace (TT_PROC_RDTEXT, /* Implicit 4-byte xfer becomes block-xfer. */ | |
3815 | gdb_tid, | |
3816 | tt_addr, | |
3817 | (TTRACE_ARG_TYPE) 4, | |
3818 | (TTRACE_ARG_TYPE) & read_buf); | |
3819 | if (tt_status < 0) | |
3820 | return tt_status; | |
3821 | return read_buf; | |
3822 | ||
3823 | case PT_READ_D: | |
3824 | tt_status = call_ttrace (TT_PROC_RDDATA, /* Implicit 4-byte xfer becomes block-xfer. */ | |
3825 | gdb_tid, | |
3826 | tt_addr, | |
3827 | (TTRACE_ARG_TYPE) 4, | |
3828 | (TTRACE_ARG_TYPE) & read_buf); | |
3829 | if (tt_status < 0) | |
3830 | return tt_status; | |
3831 | return read_buf; | |
3832 | ||
3833 | case PT_ATTACH: | |
3834 | tt_status = call_real_ttrace (TT_PROC_ATTACH, | |
3835 | map_from_gdb_tid (gdb_tid), | |
3836 | (lwpid_t) TT_NIL, | |
3837 | tt_addr, | |
3838 | (TTRACE_ARG_TYPE) TT_VERSION, | |
3839 | tt_addr2); | |
3840 | if (tt_status < 0) | |
3841 | return tt_status; | |
3842 | return tt_status; | |
c906108c SS |
3843 | |
3844 | /* The following cases are handled by merely adjusting the ptrace | |
3845 | arguments and feeding into the generic call to ttrace. | |
c5aa993b JM |
3846 | */ |
3847 | case PT_DETACH: | |
3848 | tt_request = TT_PROC_DETACH; | |
3849 | break; | |
3850 | ||
3851 | case PT_WRITE_I: | |
3852 | tt_request = TT_PROC_WRTEXT; /* Translates 4-byte xfer to block-xfer. */ | |
3853 | tt_data = 4; /* This many bytes. */ | |
3854 | tt_addr2 = (TTRACE_ARG_TYPE) & data; /* Address of xfer source. */ | |
3855 | break; | |
3856 | ||
3857 | case PT_WRITE_D: | |
3858 | tt_request = TT_PROC_WRDATA; /* Translates 4-byte xfer to block-xfer. */ | |
3859 | tt_data = 4; /* This many bytes. */ | |
3860 | tt_addr2 = (TTRACE_ARG_TYPE) & data; /* Address of xfer source. */ | |
3861 | break; | |
3862 | ||
3863 | case PT_RDTEXT: | |
3864 | tt_request = TT_PROC_RDTEXT; | |
3865 | break; | |
3866 | ||
3867 | case PT_RDDATA: | |
3868 | tt_request = TT_PROC_RDDATA; | |
3869 | break; | |
3870 | ||
3871 | case PT_WRTEXT: | |
3872 | tt_request = TT_PROC_WRTEXT; | |
3873 | break; | |
3874 | ||
3875 | case PT_WRDATA: | |
3876 | tt_request = TT_PROC_WRDATA; | |
3877 | break; | |
3878 | ||
3879 | case PT_CONTINUE: | |
3880 | tt_request = TT_PROC_CONTINUE; | |
3881 | break; | |
3882 | ||
3883 | case PT_STEP: | |
3884 | tt_request = TT_LWP_SINGLE; /* Should not be making this request? */ | |
3885 | break; | |
3886 | ||
3887 | case PT_KILL: | |
3888 | tt_request = TT_PROC_EXIT; | |
3889 | break; | |
3890 | ||
3891 | case PT_GET_PROCESS_PATHNAME: | |
3892 | tt_request = TT_PROC_GET_PATHNAME; | |
3893 | break; | |
3894 | ||
3895 | default: | |
3896 | tt_request = pt_request; /* Let ttrace be the one to complain. */ | |
3897 | break; | |
3898 | } | |
c906108c SS |
3899 | |
3900 | return call_ttrace (tt_request, | |
c5aa993b JM |
3901 | gdb_tid, |
3902 | tt_addr, | |
3903 | tt_data, | |
3904 | tt_addr2); | |
c906108c SS |
3905 | } |
3906 | ||
3907 | /* Kill that pesky process! | |
3908 | */ | |
3909 | void | |
3910 | kill_inferior () | |
3911 | { | |
c5aa993b JM |
3912 | int tid; |
3913 | int wait_status; | |
3914 | thread_info *t; | |
c906108c | 3915 | thread_info **paranoia; |
c5aa993b | 3916 | int para_count, i; |
c906108c SS |
3917 | |
3918 | if (inferior_pid == 0) | |
3919 | return; | |
3920 | ||
3921 | /* Walk the list of "threads", some of which are "pseudo threads", | |
3922 | aka "processes". For each that is NOT inferior_pid, stop it, | |
3923 | and detach it. | |
3924 | ||
3925 | You see, we may not have just a single process to kill. If we're | |
3926 | restarting or quitting or detaching just after the inferior has | |
3927 | forked, then we've actually two processes to clean up. | |
3928 | ||
3929 | But we can't just call target_mourn_inferior() for each, since that | |
3930 | zaps the target vector. | |
c5aa993b | 3931 | */ |
c906108c | 3932 | |
c5aa993b JM |
3933 | paranoia = (thread_info **) malloc (thread_head.count * |
3934 | sizeof (thread_info *)); | |
c906108c | 3935 | para_count = 0; |
c5aa993b | 3936 | |
c906108c | 3937 | t = thread_head.head; |
c5aa993b JM |
3938 | while (t) |
3939 | { | |
3940 | ||
3941 | paranoia[para_count] = t; | |
3942 | for (i = 0; i < para_count; i++) | |
3943 | { | |
3944 | if (t->next == paranoia[i]) | |
3945 | { | |
3946 | warning ("Bad data in gdb's thread data; repairing."); | |
3947 | t->next = 0; | |
3948 | } | |
3949 | } | |
3950 | para_count++; | |
3951 | ||
3952 | if (t->am_pseudo && (t->pid != inferior_pid)) | |
3953 | { | |
3954 | /* TT_PROC_STOP doesn't require a subsequent ttrace_wait, as it | |
3955 | * generates no event. | |
3956 | */ | |
3957 | call_ttrace (TT_PROC_STOP, | |
3958 | t->pid, | |
3959 | TT_NIL, | |
3960 | TT_NIL, | |
3961 | TT_NIL); | |
3962 | ||
3963 | call_ttrace (TT_PROC_DETACH, | |
3964 | t->pid, | |
3965 | TT_NIL, | |
3966 | (TTRACE_ARG_TYPE) TARGET_SIGNAL_0, | |
3967 | TT_NIL); | |
3968 | } | |
3969 | t = t->next; | |
3970 | } | |
3971 | ||
3972 | free (paranoia); | |
c906108c | 3973 | |
c906108c | 3974 | call_ttrace (TT_PROC_STOP, |
c5aa993b JM |
3975 | inferior_pid, |
3976 | TT_NIL, | |
3977 | TT_NIL, | |
3978 | TT_NIL); | |
c906108c | 3979 | target_mourn_inferior (); |
c5aa993b | 3980 | clear_thread_info (); |
c906108c SS |
3981 | } |
3982 | ||
3983 | ||
3984 | #ifndef CHILD_RESUME | |
3985 | ||
3986 | /* Sanity check a thread about to be continued. | |
3987 | */ | |
3988 | static void | |
c5aa993b JM |
3989 | thread_dropping_event_check (p) |
3990 | thread_info *p; | |
c906108c | 3991 | { |
c5aa993b JM |
3992 | if (!p->handled) |
3993 | { | |
3994 | /* | |
3995 | * This seems to happen when we "next" over a | |
3996 | * "fork()" while following the parent. If it's | |
3997 | * the FORK event, that's ok. If it's a SIGNAL | |
3998 | * in the unfollowed child, that's ok to--but | |
3999 | * how can we know that's what's going on? | |
4000 | * | |
4001 | * FIXME! | |
4002 | */ | |
4003 | if (p->have_state) | |
4004 | { | |
4005 | if (p->last_stop_state.tts_event == TTEVT_FORK) | |
4006 | { | |
4007 | /* Ok */ | |
4008 | ; | |
4009 | } | |
4010 | else if (p->last_stop_state.tts_event == TTEVT_SIGNAL) | |
4011 | { | |
4012 | /* Ok, close eyes and let it happen. | |
4013 | */ | |
4014 | ; | |
4015 | } | |
4016 | else | |
4017 | { | |
4018 | /* This shouldn't happen--we're dropping a | |
4019 | * real event. | |
4020 | */ | |
4021 | warning ("About to continue process %d, thread %d with unhandled event %s.", | |
4022 | p->pid, p->tid, | |
4023 | get_printable_name_of_ttrace_event ( | |
4024 | p->last_stop_state.tts_event)); | |
c906108c SS |
4025 | |
4026 | #ifdef PARANOIA | |
c5aa993b JM |
4027 | if (debug_on) |
4028 | print_tthread (p); | |
c906108c | 4029 | #endif |
c5aa993b JM |
4030 | } |
4031 | } | |
4032 | else | |
4033 | { | |
4034 | /* No saved state, have to assume it failed. | |
4035 | */ | |
4036 | warning ("About to continue process %d, thread %d with unhandled event.", | |
4037 | p->pid, p->tid); | |
c906108c | 4038 | #ifdef PARANOIA |
c5aa993b JM |
4039 | if (debug_on) |
4040 | print_tthread (p); | |
c906108c | 4041 | #endif |
c5aa993b | 4042 | } |
c906108c | 4043 | } |
c5aa993b JM |
4044 | |
4045 | } /* thread_dropping_event_check */ | |
c906108c SS |
4046 | |
4047 | /* Use a loop over the threads to continue all the threads but | |
4048 | * the one specified, which is to be stepped. | |
4049 | */ | |
4050 | static void | |
c5aa993b JM |
4051 | threads_continue_all_but_one (gdb_tid, signal) |
4052 | lwpid_t gdb_tid; | |
4053 | int signal; | |
c906108c | 4054 | { |
c5aa993b JM |
4055 | thread_info *p; |
4056 | int thread_signal; | |
4057 | lwpid_t real_tid; | |
4058 | lwpid_t scan_tid; | |
4059 | ttstate_t state; | |
4060 | int real_pid; | |
4061 | ||
c906108c | 4062 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4063 | if (debug_on) |
4064 | printf ("Using loop over threads to step/resume with signals\n"); | |
c906108c SS |
4065 | #endif |
4066 | ||
c5aa993b JM |
4067 | /* First update the thread list. |
4068 | */ | |
4069 | set_all_unseen (); | |
4070 | real_tid = map_from_gdb_tid (gdb_tid); | |
4071 | real_pid = get_pid_for (real_tid); | |
4072 | ||
4073 | scan_tid = get_process_first_stopped_thread_id (real_pid, &state); | |
4074 | while (0 != scan_tid) | |
4075 | { | |
4076 | ||
c906108c | 4077 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4078 | /* FIX: later should check state is stopped; |
4079 | * state.tts_flags & TTS_STATEMASK == TTS_WASSUSPENDED | |
4080 | */ | |
4081 | if (debug_on) | |
4082 | if (state.tts_flags & TTS_STATEMASK != TTS_WASSUSPENDED) | |
4083 | printf ("About to continue non-stopped thread %d\n", scan_tid); | |
c906108c SS |
4084 | #endif |
4085 | ||
c5aa993b JM |
4086 | p = find_thread_info (scan_tid); |
4087 | if (NULL == p) | |
4088 | { | |
4089 | add_tthread (real_pid, scan_tid); | |
4090 | p = find_thread_info (scan_tid); | |
4091 | ||
4092 | /* This is either a newly-created thread or the | |
4093 | * result of a fork; in either case there's no | |
4094 | * actual event to worry about. | |
4095 | */ | |
4096 | p->handled = 1; | |
4097 | ||
4098 | if (state.tts_event != TTEVT_NONE) | |
4099 | { | |
4100 | /* Oops, do need to worry! | |
4101 | */ | |
4102 | warning ("Unexpected thread with \"%s\" event.", | |
4103 | get_printable_name_of_ttrace_event (state.tts_event)); | |
4104 | } | |
4105 | } | |
4106 | else if (scan_tid != p->tid) | |
4107 | error ("Bad data in thread database."); | |
c906108c SS |
4108 | |
4109 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4110 | if (debug_on) |
4111 | if (p->terminated) | |
4112 | printf ("Why are we continuing a dead thread?\n"); | |
c906108c SS |
4113 | #endif |
4114 | ||
c5aa993b JM |
4115 | p->seen = 1; |
4116 | ||
4117 | scan_tid = get_process_next_stopped_thread_id (real_pid, &state); | |
c906108c SS |
4118 | } |
4119 | ||
c5aa993b JM |
4120 | /* Remove unseen threads. |
4121 | */ | |
4122 | update_thread_list (); | |
c906108c | 4123 | |
c5aa993b JM |
4124 | /* Now run down the thread list and continue or step. |
4125 | */ | |
4126 | for (p = thread_head.head; p; p = p->next) | |
4127 | { | |
4128 | ||
4129 | /* Sanity check. | |
4130 | */ | |
4131 | thread_dropping_event_check (p); | |
4132 | ||
4133 | /* Pass the correct signals along. | |
4134 | */ | |
4135 | if (p->have_signal) | |
4136 | { | |
4137 | thread_signal = p->signal_value; | |
4138 | p->have_signal = 0; | |
4139 | } | |
4140 | else | |
4141 | thread_signal = 0; | |
4142 | ||
4143 | if (p->tid != real_tid) | |
4144 | { | |
4145 | /* | |
4146 | * Not the thread of interest, so continue it | |
4147 | * as the user expects. | |
4148 | */ | |
4149 | if (p->stepping_mode == DO_STEP) | |
4150 | { | |
4151 | /* Just step this thread. | |
4152 | */ | |
4153 | call_ttrace ( | |
4154 | TT_LWP_SINGLE, | |
4155 | p->tid, | |
4156 | TT_USE_CURRENT_PC, | |
4157 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4158 | TT_NIL); | |
4159 | } | |
4160 | else | |
4161 | { | |
4162 | /* Regular continue (default case). | |
4163 | */ | |
4164 | call_ttrace ( | |
4165 | TT_LWP_CONTINUE, | |
4166 | p->tid, | |
4167 | TT_USE_CURRENT_PC, | |
4168 | (TTRACE_ARG_TYPE) target_signal_to_host (thread_signal), | |
4169 | TT_NIL); | |
4170 | } | |
4171 | } | |
4172 | else | |
4173 | { | |
4174 | /* Step the thread of interest. | |
4175 | */ | |
4176 | call_ttrace ( | |
4177 | TT_LWP_SINGLE, | |
4178 | real_tid, | |
4179 | TT_USE_CURRENT_PC, | |
4180 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4181 | TT_NIL); | |
4182 | } | |
4183 | } /* Loop over threads */ | |
4184 | } /* End threads_continue_all_but_one */ | |
c906108c SS |
4185 | |
4186 | /* Use a loop over the threads to continue all the threads. | |
4187 | * This is done when a signal must be sent to any of the threads. | |
4188 | */ | |
4189 | static void | |
c5aa993b JM |
4190 | threads_continue_all_with_signals (gdb_tid, signal) |
4191 | lwpid_t gdb_tid; | |
4192 | int signal; | |
c906108c | 4193 | { |
c5aa993b JM |
4194 | thread_info *p; |
4195 | int thread_signal; | |
4196 | lwpid_t real_tid; | |
4197 | lwpid_t scan_tid; | |
4198 | ttstate_t state; | |
4199 | int real_pid; | |
c906108c SS |
4200 | |
4201 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4202 | if (debug_on) |
4203 | printf ("Using loop over threads to resume with signals\n"); | |
c906108c SS |
4204 | #endif |
4205 | ||
c5aa993b JM |
4206 | /* Scan and update thread list. |
4207 | */ | |
4208 | set_all_unseen (); | |
4209 | real_tid = map_from_gdb_tid (gdb_tid); | |
4210 | real_pid = get_pid_for (real_tid); | |
4211 | ||
4212 | scan_tid = get_process_first_stopped_thread_id (real_pid, &state); | |
4213 | while (0 != scan_tid) | |
4214 | { | |
4215 | ||
4216 | #ifdef THREAD_DEBUG | |
4217 | if (debug_on) | |
4218 | if (state.tts_flags & TTS_STATEMASK != TTS_WASSUSPENDED) | |
4219 | warning ("About to continue non-stopped thread %d\n", scan_tid); | |
4220 | #endif | |
4221 | ||
4222 | p = find_thread_info (scan_tid); | |
4223 | if (NULL == p) | |
4224 | { | |
4225 | add_tthread (real_pid, scan_tid); | |
4226 | p = find_thread_info (scan_tid); | |
4227 | ||
4228 | /* This is either a newly-created thread or the | |
4229 | * result of a fork; in either case there's no | |
4230 | * actual event to worry about. | |
4231 | */ | |
4232 | p->handled = 1; | |
4233 | ||
4234 | if (state.tts_event != TTEVT_NONE) | |
4235 | { | |
4236 | /* Oops, do need to worry! | |
4237 | */ | |
4238 | warning ("Unexpected thread with \"%s\" event.", | |
4239 | get_printable_name_of_ttrace_event (state.tts_event)); | |
4240 | } | |
4241 | } | |
c906108c | 4242 | |
c906108c | 4243 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4244 | if (debug_on) |
4245 | if (p->terminated) | |
4246 | printf ("Why are we continuing a dead thread? (1)\n"); | |
c906108c SS |
4247 | #endif |
4248 | ||
c5aa993b | 4249 | p->seen = 1; |
c906108c | 4250 | |
c5aa993b JM |
4251 | scan_tid = get_process_next_stopped_thread_id (real_pid, &state); |
4252 | } | |
c906108c | 4253 | |
c5aa993b JM |
4254 | /* Remove unseen threads from our list. |
4255 | */ | |
4256 | update_thread_list (); | |
c906108c | 4257 | |
c5aa993b JM |
4258 | /* Continue the threads. |
4259 | */ | |
4260 | for (p = thread_head.head; p; p = p->next) | |
4261 | { | |
c906108c | 4262 | |
c5aa993b JM |
4263 | /* Sanity check. |
4264 | */ | |
4265 | thread_dropping_event_check (p); | |
c906108c | 4266 | |
c5aa993b JM |
4267 | /* Pass the correct signals along. |
4268 | */ | |
4269 | if (p->tid == real_tid) | |
4270 | { | |
4271 | thread_signal = signal; | |
4272 | p->have_signal = 0; | |
4273 | } | |
4274 | else if (p->have_signal) | |
4275 | { | |
4276 | thread_signal = p->signal_value; | |
4277 | p->have_signal = 0; | |
4278 | } | |
4279 | else | |
4280 | thread_signal = 0; | |
4281 | ||
4282 | if (p->stepping_mode == DO_STEP) | |
4283 | { | |
4284 | call_ttrace ( | |
4285 | TT_LWP_SINGLE, | |
4286 | p->tid, | |
4287 | TT_USE_CURRENT_PC, | |
4288 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4289 | TT_NIL); | |
4290 | } | |
4291 | else | |
4292 | { | |
4293 | /* Continue this thread (default case). | |
4294 | */ | |
4295 | call_ttrace ( | |
4296 | TT_LWP_CONTINUE, | |
4297 | p->tid, | |
4298 | TT_USE_CURRENT_PC, | |
4299 | (TTRACE_ARG_TYPE) target_signal_to_host (thread_signal), | |
4300 | TT_NIL); | |
4301 | } | |
4302 | } | |
4303 | } /* End threads_continue_all_with_signals */ | |
c906108c SS |
4304 | |
4305 | /* Step one thread only. | |
4306 | */ | |
4307 | static void | |
c5aa993b JM |
4308 | thread_fake_step (tid, signal) |
4309 | lwpid_t tid; | |
4310 | enum target_signal signal; | |
c906108c | 4311 | { |
c5aa993b | 4312 | thread_info *p; |
c906108c SS |
4313 | |
4314 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4315 | if (debug_on) |
4316 | { | |
4317 | printf ("Doing a fake-step over a bpt, etc. for %d\n", tid); | |
c906108c | 4318 | |
c5aa993b JM |
4319 | if (is_terminated (tid)) |
4320 | printf ("Why are we continuing a dead thread? (4)\n"); | |
c906108c SS |
4321 | } |
4322 | #endif | |
c906108c | 4323 | |
c5aa993b JM |
4324 | if (doing_fake_step) |
4325 | warning ("Step while step already in progress."); | |
4326 | ||
4327 | /* See if there's a saved signal value for this | |
4328 | * thread to be passed on, but no current signal. | |
4329 | */ | |
4330 | p = find_thread_info (tid); | |
4331 | if (p != NULL) | |
4332 | { | |
4333 | if (p->have_signal && signal == NULL) | |
4334 | { | |
4335 | /* Pass on a saved signal. | |
4336 | */ | |
4337 | signal = p->signal_value; | |
4338 | } | |
4339 | ||
4340 | p->have_signal = 0; | |
4341 | } | |
4342 | ||
4343 | if (!p->handled) | |
4344 | warning ("Internal error: continuing unhandled thread."); | |
c906108c | 4345 | |
c5aa993b JM |
4346 | call_ttrace (TT_LWP_SINGLE, |
4347 | tid, | |
4348 | TT_USE_CURRENT_PC, | |
4349 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4350 | TT_NIL); | |
4351 | ||
4352 | /* Do bookkeeping so "call_ttrace_wait" knows it has to wait | |
4353 | * for this thread only, and clear any saved signal info. | |
4354 | */ | |
4355 | doing_fake_step = 1; | |
4356 | fake_step_tid = tid; | |
4357 | ||
4358 | } /* End thread_fake_step */ | |
c906108c SS |
4359 | |
4360 | /* Continue one thread when a signal must be sent to it. | |
4361 | */ | |
4362 | static void | |
c5aa993b JM |
4363 | threads_continue_one_with_signal (gdb_tid, signal) |
4364 | lwpid_t gdb_tid; | |
4365 | int signal; | |
c906108c | 4366 | { |
c5aa993b JM |
4367 | thread_info *p; |
4368 | lwpid_t real_tid; | |
4369 | int real_pid; | |
4370 | ||
c906108c | 4371 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4372 | if (debug_on) |
4373 | printf ("Continuing one thread with a signal\n"); | |
c906108c SS |
4374 | #endif |
4375 | ||
c5aa993b JM |
4376 | real_tid = map_from_gdb_tid (gdb_tid); |
4377 | real_pid = get_pid_for (real_tid); | |
c906108c | 4378 | |
c5aa993b JM |
4379 | p = find_thread_info (real_tid); |
4380 | if (NULL == p) | |
4381 | { | |
4382 | add_tthread (real_pid, real_tid); | |
c906108c SS |
4383 | } |
4384 | ||
4385 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4386 | if (debug_on) |
4387 | if (p->terminated) | |
4388 | printf ("Why are we continuing a dead thread? (2)\n"); | |
c906108c SS |
4389 | #endif |
4390 | ||
c5aa993b JM |
4391 | if (!p->handled) |
4392 | warning ("Internal error: continuing unhandled thread."); | |
4393 | ||
4394 | p->have_signal = 0; | |
4395 | ||
4396 | call_ttrace (TT_LWP_CONTINUE, | |
4397 | gdb_tid, | |
4398 | TT_USE_CURRENT_PC, | |
4399 | (TTRACE_ARG_TYPE) target_signal_to_host (signal), | |
4400 | TT_NIL); | |
c906108c SS |
4401 | } |
4402 | #endif | |
4403 | ||
4404 | #ifndef CHILD_RESUME | |
4405 | ||
4406 | /* Resume execution of the inferior process. | |
c5aa993b | 4407 | |
c906108c SS |
4408 | * This routine is in charge of setting the "handled" bits. |
4409 | * | |
4410 | * If STEP is zero, continue it. | |
4411 | * If STEP is nonzero, single-step it. | |
4412 | * | |
4413 | * If SIGNAL is nonzero, give it that signal. | |
4414 | * | |
4415 | * If TID is -1, apply to all threads. | |
4416 | * If TID is not -1, apply to specified thread. | |
4417 | * | |
4418 | * STEP | |
4419 | * \ !0 0 | |
4420 | * TID \________________________________________________ | |
4421 | * | | |
4422 | * -1 | Step current Continue all threads | |
4423 | * | thread and (but which gets any | |
4424 | * | continue others signal?--We look at | |
4425 | * | "inferior_pid") | |
4426 | * | | |
4427 | * N | Step _this_ thread Continue _this_ thread | |
4428 | * | and leave others and leave others | |
4429 | * | stopped; internally stopped; used only for | |
4430 | * | used by gdb, never hardware watchpoints | |
4431 | * | a user command. and attach, never a | |
4432 | * | user command. | |
4433 | */ | |
4434 | void | |
c5aa993b | 4435 | child_resume (gdb_tid, step, signal) |
c906108c | 4436 | lwpid_t gdb_tid; |
c5aa993b | 4437 | int step; |
c906108c SS |
4438 | enum target_signal signal; |
4439 | { | |
c5aa993b | 4440 | int resume_all_threads; |
c906108c | 4441 | lwpid_t tid; |
c5aa993b | 4442 | process_state_t new_process_state; |
c906108c SS |
4443 | |
4444 | resume_all_threads = | |
4445 | (gdb_tid == INFTTRACE_ALL_THREADS) || | |
4446 | (vfork_in_flight); | |
4447 | ||
c5aa993b JM |
4448 | if (resume_all_threads) |
4449 | { | |
4450 | /* Resume all threads, but first pick a tid value | |
4451 | * so we can get the pid when in call_ttrace doing | |
4452 | * the map. | |
4453 | */ | |
4454 | if (vfork_in_flight) | |
4455 | tid = vforking_child_pid; | |
4456 | else | |
4457 | tid = map_from_gdb_tid (inferior_pid); | |
4458 | } | |
c906108c | 4459 | else |
c5aa993b | 4460 | tid = map_from_gdb_tid (gdb_tid); |
c906108c SS |
4461 | |
4462 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4463 | if (debug_on) |
4464 | { | |
4465 | if (more_events_left) | |
4466 | printf ("More events; "); | |
c906108c | 4467 | |
c5aa993b JM |
4468 | if (signal != 0) |
4469 | printf ("Sending signal %d; ", signal); | |
4470 | ||
4471 | if (resume_all_threads) | |
4472 | { | |
4473 | if (step == 0) | |
4474 | printf ("Continue process %d\n", tid); | |
4475 | else | |
4476 | printf ("Step/continue thread %d\n", tid); | |
4477 | } | |
4478 | else | |
4479 | { | |
4480 | if (step == 0) | |
4481 | printf ("Continue thread %d\n", tid); | |
4482 | else | |
4483 | printf ("Step just thread %d\n", tid); | |
4484 | } | |
4485 | ||
4486 | if (vfork_in_flight) | |
4487 | printf ("Vfork in flight\n"); | |
4488 | } | |
c906108c SS |
4489 | #endif |
4490 | ||
c5aa993b JM |
4491 | if (process_state == RUNNING) |
4492 | warning ("Internal error in resume logic; doing resume or step anyway."); | |
4493 | ||
4494 | if (!step /* Asked to continue... */ | |
4495 | && resume_all_threads /* whole process.. */ | |
4496 | && signal != 0 /* with a signal... */ | |
4497 | && more_events_left > 0) | |
4498 | { /* but we can't yet--save it! */ | |
c906108c SS |
4499 | |
4500 | /* Continue with signal means we have to set the pending | |
4501 | * signal value for this thread. | |
4502 | */ | |
4503 | thread_info *k; | |
c5aa993b | 4504 | |
c906108c | 4505 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4506 | if (debug_on) |
4507 | printf ("Saving signal %d for thread %d\n", signal, tid); | |
c906108c SS |
4508 | #endif |
4509 | ||
c5aa993b JM |
4510 | k = find_thread_info (tid); |
4511 | if (k != NULL) | |
4512 | { | |
4513 | k->have_signal = 1; | |
4514 | k->signal_value = signal; | |
c906108c SS |
4515 | |
4516 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4517 | if (debug_on) |
4518 | if (k->terminated) | |
4519 | printf ("Why are we continuing a dead thread? (3)\n"); | |
c906108c SS |
4520 | #endif |
4521 | ||
c5aa993b | 4522 | } |
c906108c SS |
4523 | |
4524 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4525 | else if (debug_on) |
4526 | { | |
4527 | printf ("No thread info for tid %d\n", tid); | |
4528 | } | |
c906108c | 4529 | #endif |
c5aa993b | 4530 | } |
c906108c SS |
4531 | |
4532 | /* Are we faking this "continue" or "step"? | |
c5aa993b | 4533 | |
c906108c SS |
4534 | * We used to do steps by continuing all the threads for |
4535 | * which the events had been handled already. While | |
4536 | * conceptually nicer (hides it all in a lower level), this | |
4537 | * can lead to starvation and a hang (e.g. all but one thread | |
4538 | * are unhandled at a breakpoint just before a "join" operation, | |
4539 | * and one thread is in the join, and the user wants to step that | |
4540 | * thread). | |
4541 | */ | |
c5aa993b JM |
4542 | if (resume_all_threads /* Whole process, therefore user command */ |
4543 | && more_events_left > 0) | |
4544 | { /* But we can't do this yet--fake it! */ | |
c906108c | 4545 | thread_info *p; |
c5aa993b JM |
4546 | |
4547 | if (!step) | |
4548 | { | |
4549 | /* No need to do any notes on a per-thread | |
4550 | * basis--we're done! | |
4551 | */ | |
c906108c | 4552 | #ifdef WAIT_BUFFER_DEBUG |
c5aa993b JM |
4553 | if (debug_on) |
4554 | printf ("Faking a process resume.\n"); | |
c906108c SS |
4555 | #endif |
4556 | ||
c5aa993b JM |
4557 | return; |
4558 | } | |
4559 | else | |
4560 | { | |
c906108c SS |
4561 | |
4562 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
4563 | if (debug_on) |
4564 | printf ("Faking a process step.\n"); | |
c906108c SS |
4565 | #endif |
4566 | ||
c5aa993b JM |
4567 | } |
4568 | ||
4569 | p = find_thread_info (tid); | |
4570 | if (p == NULL) | |
4571 | { | |
4572 | warning ("No thread information for tid %d, 'next' command ignored.\n", tid); | |
4573 | return; | |
4574 | } | |
4575 | else | |
4576 | { | |
c906108c SS |
4577 | |
4578 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4579 | if (debug_on) |
4580 | if (p->terminated) | |
4581 | printf ("Why are we continuing a dead thread? (3.5)\n"); | |
c906108c SS |
4582 | #endif |
4583 | ||
c5aa993b JM |
4584 | if (p->stepping_mode != DO_DEFAULT) |
4585 | { | |
4586 | warning ("Step or continue command applied to thread which is already stepping or continuing; command ignored."); | |
c906108c | 4587 | |
c5aa993b JM |
4588 | return; |
4589 | } | |
c906108c | 4590 | |
c5aa993b JM |
4591 | if (step) |
4592 | p->stepping_mode = DO_STEP; | |
4593 | else | |
4594 | p->stepping_mode = DO_CONTINUE; | |
c906108c | 4595 | |
c5aa993b JM |
4596 | return; |
4597 | } /* Have thread info */ | |
4598 | } /* Must fake step or go */ | |
c906108c SS |
4599 | |
4600 | /* Execept for fake-steps, from here on we know we are | |
4601 | * going to wind up with a running process which will | |
4602 | * need a real wait. | |
4603 | */ | |
4604 | new_process_state = RUNNING; | |
4605 | ||
4606 | /* An address of TT_USE_CURRENT_PC tells ttrace to continue from where | |
4607 | * it was. (If GDB wanted it to start some other way, we have already | |
4608 | * written a new PC value to the child.) | |
4609 | * | |
4610 | * If this system does not support PT_STEP, a higher level function will | |
4611 | * have called single_step() to transmute the step request into a | |
4612 | * continue request (by setting breakpoints on all possible successor | |
4613 | * instructions), so we don't have to worry about that here. | |
4614 | */ | |
c5aa993b JM |
4615 | if (step) |
4616 | { | |
4617 | if (resume_all_threads) | |
4618 | { | |
4619 | /* | |
4620 | * Regular user step: other threads get a "continue". | |
4621 | */ | |
4622 | threads_continue_all_but_one (tid, signal); | |
4623 | clear_all_handled (); | |
4624 | clear_all_stepping_mode (); | |
4625 | } | |
4626 | ||
4627 | else | |
4628 | { | |
4629 | /* "Fake step": gdb is stepping one thread over a | |
4630 | * breakpoint, watchpoint, or out of a library load | |
4631 | * event, etc. The rest just stay where they are. | |
4632 | * | |
4633 | * Also used when there are pending events: we really | |
4634 | * step the current thread, but leave the rest stopped. | |
4635 | * Users can't request this, but "wait_for_inferior" | |
4636 | * does--a lot! | |
4637 | */ | |
4638 | thread_fake_step (tid, signal); | |
4639 | ||
4640 | /* Clear the "handled" state of this thread, because | |
4641 | * we'll soon get a new event for it. Other events | |
4642 | * stay as they were. | |
4643 | */ | |
4644 | clear_handled (tid); | |
4645 | clear_stepping_mode (tid); | |
4646 | new_process_state = FAKE_STEPPING; | |
4647 | } | |
4648 | } | |
4649 | ||
4650 | else | |
4651 | { | |
c906108c SS |
4652 | /* TT_LWP_CONTINUE can pass signals to threads, |
4653 | * TT_PROC_CONTINUE can't. So if there are any | |
4654 | * signals to pass, we have to use the (slower) | |
4655 | * loop over the stopped threads. | |
4656 | * | |
4657 | * Equally, if we have to not continue some threads, | |
4658 | * due to saved events, we have to use the loop. | |
4659 | */ | |
c5aa993b JM |
4660 | if ((signal != 0) || saved_signals_exist ()) |
4661 | { | |
4662 | if (resume_all_threads) | |
4663 | { | |
c906108c SS |
4664 | |
4665 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4666 | if (debug_on) |
4667 | printf ("Doing a continue by loop of all threads\n"); | |
c906108c SS |
4668 | #endif |
4669 | ||
c5aa993b | 4670 | threads_continue_all_with_signals (tid, signal); |
c906108c | 4671 | |
c5aa993b JM |
4672 | clear_all_handled (); |
4673 | clear_all_stepping_mode (); | |
4674 | } | |
c906108c | 4675 | |
c5aa993b JM |
4676 | else |
4677 | { | |
c906108c | 4678 | #ifdef THREAD_DEBUG |
c5aa993b | 4679 | printf ("Doing a continue w/signal of just thread %d\n", tid); |
c906108c SS |
4680 | #endif |
4681 | ||
c5aa993b JM |
4682 | threads_continue_one_with_signal (tid, signal); |
4683 | ||
4684 | /* Clear the "handled" state of this thread, because | |
4685 | * we'll soon get a new event for it. Other events | |
4686 | * can stay as they were. | |
4687 | */ | |
4688 | clear_handled (tid); | |
4689 | clear_stepping_mode (tid); | |
4690 | } | |
4691 | } | |
4692 | ||
4693 | else | |
4694 | { | |
4695 | /* No signals to send. | |
4696 | */ | |
4697 | if (resume_all_threads) | |
4698 | { | |
c906108c | 4699 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4700 | if (debug_on) |
4701 | printf ("Doing a continue by process of process %d\n", tid); | |
c906108c SS |
4702 | #endif |
4703 | ||
c5aa993b JM |
4704 | if (more_events_left > 0) |
4705 | { | |
4706 | warning ("Losing buffered events on continue."); | |
4707 | more_events_left = 0; | |
4708 | } | |
c906108c | 4709 | |
c5aa993b JM |
4710 | call_ttrace (TT_PROC_CONTINUE, |
4711 | tid, | |
4712 | TT_NIL, | |
4713 | TT_NIL, | |
4714 | TT_NIL); | |
c906108c | 4715 | |
c5aa993b JM |
4716 | clear_all_handled (); |
4717 | clear_all_stepping_mode (); | |
4718 | } | |
c906108c | 4719 | |
c5aa993b JM |
4720 | else |
4721 | { | |
c906108c | 4722 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4723 | if (debug_on) |
4724 | { | |
4725 | printf ("Doing a continue of just thread %d\n", tid); | |
4726 | if (is_terminated (tid)) | |
4727 | printf ("Why are we continuing a dead thread? (5)\n"); | |
4728 | } | |
c906108c SS |
4729 | #endif |
4730 | ||
c5aa993b JM |
4731 | call_ttrace (TT_LWP_CONTINUE, |
4732 | tid, | |
4733 | TT_NIL, | |
4734 | TT_NIL, | |
4735 | TT_NIL); | |
4736 | ||
4737 | /* Clear the "handled" state of this thread, because | |
4738 | * we'll soon get a new event for it. Other events | |
4739 | * can stay as they were. | |
4740 | */ | |
4741 | clear_handled (tid); | |
4742 | clear_stepping_mode (tid); | |
4743 | } | |
4744 | } | |
4745 | } | |
c906108c SS |
4746 | |
4747 | process_state = new_process_state; | |
4748 | ||
4749 | #ifdef WAIT_BUFFER_DEBUG | |
c5aa993b JM |
4750 | if (debug_on) |
4751 | printf ("Process set to %s\n", | |
4752 | get_printable_name_of_process_state (process_state)); | |
c906108c SS |
4753 | #endif |
4754 | ||
4755 | } | |
4756 | #endif /* CHILD_RESUME */ | |
c906108c | 4757 | \f |
c5aa993b | 4758 | |
c906108c SS |
4759 | #ifdef ATTACH_DETACH |
4760 | /* | |
4761 | * Like it says. | |
4762 | * | |
4763 | * One worry is that we may not be attaching to "inferior_pid" | |
4764 | * and thus may not want to clear out our data. FIXME? | |
4765 | * | |
4766 | */ | |
4767 | static void | |
c5aa993b JM |
4768 | update_thread_state_after_attach (pid, kind_of_go) |
4769 | int pid; | |
4770 | attach_continue_t kind_of_go; | |
c906108c | 4771 | { |
c5aa993b JM |
4772 | int tt_status; |
4773 | ttstate_t thread_state; | |
4774 | lwpid_t a_thread; | |
4775 | lwpid_t tid; | |
c906108c SS |
4776 | |
4777 | /* The process better be stopped. | |
4778 | */ | |
c5aa993b JM |
4779 | if (process_state != STOPPED |
4780 | && process_state != VFORKING) | |
4781 | warning ("Internal error attaching."); | |
c906108c SS |
4782 | |
4783 | /* Clear out old tthread info and start over. This has the | |
4784 | * side effect of ensuring that the TRAP is reported as being | |
4785 | * in the right thread (re-mapped from tid to pid). | |
4786 | * | |
4787 | * It's because we need to add the tthread _now_ that we | |
4788 | * need to call "clear_thread_info" _now_, and that's why | |
4789 | * "require_notification_of_events" doesn't clear the thread | |
4790 | * info (it's called later than this routine). | |
4791 | */ | |
c5aa993b | 4792 | clear_thread_info (); |
c906108c SS |
4793 | a_thread = 0; |
4794 | ||
4795 | for (tid = get_process_first_stopped_thread_id (pid, &thread_state); | |
4796 | tid != 0; | |
4797 | tid = get_process_next_stopped_thread_id (pid, &thread_state)) | |
4798 | { | |
4799 | thread_info *p; | |
c5aa993b | 4800 | |
c906108c | 4801 | if (a_thread == 0) |
c5aa993b JM |
4802 | { |
4803 | a_thread = tid; | |
c906108c | 4804 | #ifdef THREAD_DEBUG |
c5aa993b JM |
4805 | if (debug_on) |
4806 | printf ("Attaching to process %d, thread %d\n", | |
4807 | pid, a_thread); | |
c906108c | 4808 | #endif |
c5aa993b | 4809 | } |
c906108c SS |
4810 | |
4811 | /* Tell ourselves and the "rest of gdb" that this thread | |
4812 | * exists. | |
4813 | * | |
4814 | * This isn't really a hack. Other thread-based versions | |
4815 | * of gdb (e.g. gnu-nat.c) seem to do the same thing. | |
4816 | * | |
4817 | * We don't need to do mapping here, as we know this | |
4818 | * is the first thread and thus gets the real pid | |
4819 | * (and is "inferior_pid"). | |
4820 | * | |
4821 | * NOTE: it probably isn't the originating thread, | |
4822 | * but that doesn't matter (we hope!). | |
4823 | */ | |
c5aa993b JM |
4824 | add_tthread (pid, tid); |
4825 | p = find_thread_info (tid); | |
4826 | if (NULL == p) /* ?We just added it! */ | |
4827 | error ("Internal error adding a thread on attach."); | |
4828 | ||
4829 | copy_ttstate_t (&p->last_stop_state, thread_state); | |
c906108c | 4830 | p->have_state = 1; |
c5aa993b JM |
4831 | |
4832 | if (DO_ATTACH_CONTINUE == kind_of_go) | |
4833 | { | |
4834 | /* | |
4835 | * If we are going to CONTINUE afterwards, | |
4836 | * raising a SIGTRAP, don't bother trying to | |
4837 | * handle this event. But check first! | |
4838 | */ | |
4839 | switch (p->last_stop_state.tts_event) | |
4840 | { | |
4841 | ||
4842 | case TTEVT_NONE: | |
4843 | /* Ok to set this handled. | |
4844 | */ | |
4845 | break; | |
4846 | ||
4847 | default: | |
4848 | warning ("Internal error; skipping event %s on process %d, thread %d.", | |
4849 | get_printable_name_of_ttrace_event ( | |
4850 | p->last_stop_state.tts_event), | |
4851 | p->pid, p->tid); | |
4852 | } | |
4853 | ||
4854 | set_handled (pid, tid); | |
4855 | ||
4856 | } | |
4857 | else | |
4858 | { | |
4859 | /* There will be no "continue" opertion, so the | |
4860 | * process remains stopped. Don't set any events | |
4861 | * handled except the "gimmies". | |
4862 | */ | |
4863 | switch (p->last_stop_state.tts_event) | |
4864 | { | |
4865 | ||
4866 | case TTEVT_NONE: | |
4867 | /* Ok to ignore this. | |
4868 | */ | |
4869 | set_handled (pid, tid); | |
4870 | break; | |
4871 | ||
4872 | case TTEVT_EXEC: | |
4873 | case TTEVT_FORK: | |
4874 | /* Expected "other" FORK or EXEC event from a | |
4875 | * fork or vfork. | |
4876 | */ | |
4877 | break; | |
4878 | ||
4879 | default: | |
4880 | printf ("Internal error: failed to handle event %s on process %d, thread %d.", | |
4881 | get_printable_name_of_ttrace_event ( | |
4882 | p->last_stop_state.tts_event), | |
4883 | p->pid, p->tid); | |
4884 | } | |
4885 | } | |
4886 | ||
4887 | add_thread (tid); /* in thread.c */ | |
c906108c | 4888 | } |
c5aa993b | 4889 | |
c906108c | 4890 | #ifdef PARANOIA |
c5aa993b JM |
4891 | if (debug_on) |
4892 | print_tthreads (); | |
c906108c SS |
4893 | #endif |
4894 | ||
4895 | /* One mustn't call ttrace_wait() after attaching via ttrace, | |
4896 | 'cause the process is stopped already. | |
c5aa993b | 4897 | |
c906108c SS |
4898 | However, the upper layers of gdb's execution control will |
4899 | want to wait after attaching (but not after forks, in | |
4900 | which case they will be doing a "target_resume", anticipating | |
4901 | a later TTEVT_EXEC or TTEVT_FORK event). | |
4902 | ||
4903 | To make this attach() implementation more compatible with | |
4904 | others, we'll make the attached-to process raise a SIGTRAP. | |
4905 | ||
4906 | Issue: this continues only one thread. That could be | |
4907 | dangerous if the thread is blocked--the process won't run | |
4908 | and no trap will be raised. FIX! (check state.tts_flags? | |
4909 | need one that's either TTS_WASRUNNING--but we've stopped | |
4910 | it and made it TTS_WASSUSPENDED. Hum...FIXME!) | |
4911 | */ | |
c5aa993b JM |
4912 | if (DO_ATTACH_CONTINUE == kind_of_go) |
4913 | { | |
4914 | tt_status = call_real_ttrace ( | |
4915 | TT_LWP_CONTINUE, | |
4916 | pid, | |
4917 | a_thread, | |
4918 | TT_USE_CURRENT_PC, | |
4919 | (TTRACE_ARG_TYPE) target_signal_to_host (TARGET_SIGNAL_TRAP), | |
4920 | TT_NIL); | |
c906108c | 4921 | if (errno) |
c5aa993b | 4922 | perror_with_name ("ttrace"); |
c906108c | 4923 | |
c5aa993b | 4924 | clear_handled (a_thread); /* So TRAP will be reported. */ |
c906108c SS |
4925 | |
4926 | /* Now running. | |
4927 | */ | |
4928 | process_state = RUNNING; | |
c5aa993b | 4929 | } |
c906108c SS |
4930 | |
4931 | attach_flag = 1; | |
4932 | } | |
4933 | #endif /* ATTACH_DETACH */ | |
c906108c | 4934 | \f |
c5aa993b | 4935 | |
c906108c SS |
4936 | #ifdef ATTACH_DETACH |
4937 | /* Start debugging the process whose number is PID. | |
4938 | * (A _real_ pid). | |
4939 | */ | |
4940 | int | |
c5aa993b | 4941 | attach (pid) |
c906108c SS |
4942 | int pid; |
4943 | { | |
c5aa993b JM |
4944 | int tt_status; |
4945 | ||
c906108c | 4946 | tt_status = call_real_ttrace ( |
c5aa993b JM |
4947 | TT_PROC_ATTACH, |
4948 | pid, | |
4949 | (lwpid_t) TT_NIL, | |
4950 | TT_NIL, | |
4951 | (TTRACE_ARG_TYPE) TT_VERSION, | |
4952 | TT_NIL); | |
c906108c SS |
4953 | if (errno) |
4954 | perror_with_name ("ttrace attach"); | |
4955 | ||
4956 | /* If successful, the process is now stopped. | |
4957 | */ | |
4958 | process_state = STOPPED; | |
4959 | ||
4960 | /* Our caller ("attach_command" in "infcmd.c") | |
4961 | * expects to do a "wait_for_inferior" after | |
4962 | * the attach, so make sure the inferior is | |
4963 | * running when we're done. | |
4964 | */ | |
c5aa993b | 4965 | update_thread_state_after_attach (pid, DO_ATTACH_CONTINUE); |
c906108c SS |
4966 | |
4967 | return pid; | |
4968 | } | |
4969 | ||
4970 | ||
4971 | #if defined(CHILD_POST_ATTACH) | |
4972 | void | |
4973 | child_post_attach (pid) | |
c5aa993b | 4974 | int pid; |
c906108c SS |
4975 | { |
4976 | #ifdef THREAD_DEBUG | |
c5aa993b JM |
4977 | if (debug_on) |
4978 | printf ("child-post-attach call\n"); | |
c906108c SS |
4979 | #endif |
4980 | ||
4981 | require_notification_of_events (pid); | |
4982 | } | |
4983 | #endif | |
4984 | ||
4985 | ||
4986 | /* Stop debugging the process whose number is PID | |
4987 | and continue it with signal number SIGNAL. | |
4988 | SIGNAL = 0 means just continue it. | |
4989 | */ | |
4990 | void | |
c5aa993b | 4991 | detach (signal) |
c906108c SS |
4992 | int signal; |
4993 | { | |
4994 | errno = 0; | |
4995 | call_ttrace (TT_PROC_DETACH, | |
c5aa993b JM |
4996 | inferior_pid, |
4997 | TT_NIL, | |
4998 | (TTRACE_ARG_TYPE) signal, | |
4999 | TT_NIL); | |
c906108c SS |
5000 | attach_flag = 0; |
5001 | ||
c5aa993b | 5002 | clear_thread_info (); |
c906108c SS |
5003 | |
5004 | /* Process-state? */ | |
5005 | } | |
5006 | #endif /* ATTACH_DETACH */ | |
c906108c | 5007 | \f |
c5aa993b | 5008 | |
c906108c SS |
5009 | /* Default the type of the ttrace transfer to int. */ |
5010 | #ifndef TTRACE_XFER_TYPE | |
5011 | #define TTRACE_XFER_TYPE int | |
5012 | #endif | |
5013 | ||
5014 | void | |
5015 | _initialize_kernel_u_addr () | |
5016 | { | |
5017 | } | |
5018 | ||
5019 | #if !defined (CHILD_XFER_MEMORY) | |
5020 | /* NOTE! I tried using TTRACE_READDATA, etc., to read and write memory | |
5021 | in the NEW_SUN_TTRACE case. | |
5022 | It ought to be straightforward. But it appears that writing did | |
5023 | not write the data that I specified. I cannot understand where | |
5024 | it got the data that it actually did write. */ | |
5025 | ||
5026 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR | |
5027 | to debugger memory starting at MYADDR. Copy to inferior if | |
5028 | WRITE is nonzero. | |
c5aa993b | 5029 | |
c906108c SS |
5030 | Returns the length copied, which is either the LEN argument or zero. |
5031 | This xfer function does not do partial moves, since child_ops | |
5032 | doesn't allow memory operations to cross below us in the target stack | |
5033 | anyway. */ | |
5034 | ||
5035 | int | |
5036 | child_xfer_memory (memaddr, myaddr, len, write, target) | |
5037 | CORE_ADDR memaddr; | |
5038 | char *myaddr; | |
5039 | int len; | |
5040 | int write; | |
c5aa993b | 5041 | struct target_ops *target; /* ignored */ |
c906108c SS |
5042 | { |
5043 | register int i; | |
5044 | /* Round starting address down to longword boundary. */ | |
c5aa993b | 5045 | register CORE_ADDR addr = memaddr & -sizeof (TTRACE_XFER_TYPE); |
c906108c SS |
5046 | /* Round ending address up; get number of longwords that makes. */ |
5047 | register int count | |
c5aa993b JM |
5048 | = (((memaddr + len) - addr) + sizeof (TTRACE_XFER_TYPE) - 1) |
5049 | / sizeof (TTRACE_XFER_TYPE); | |
c906108c SS |
5050 | /* Allocate buffer of that many longwords. */ |
5051 | register TTRACE_XFER_TYPE *buffer | |
c5aa993b | 5052 | = (TTRACE_XFER_TYPE *) alloca (count * sizeof (TTRACE_XFER_TYPE)); |
c906108c SS |
5053 | |
5054 | if (write) | |
5055 | { | |
5056 | /* Fill start and end extra bytes of buffer with existing memory data. */ | |
5057 | ||
c5aa993b JM |
5058 | if (addr != memaddr || len < (int) sizeof (TTRACE_XFER_TYPE)) |
5059 | { | |
5060 | /* Need part of initial word -- fetch it. */ | |
5061 | buffer[0] = call_ttrace (TT_LWP_RDTEXT, | |
5062 | inferior_pid, | |
5063 | (TTRACE_ARG_TYPE) addr, | |
5064 | TT_NIL, | |
5065 | TT_NIL); | |
5066 | } | |
c906108c SS |
5067 | |
5068 | if (count > 1) /* FIXME, avoid if even boundary */ | |
5069 | { | |
5070 | buffer[count - 1] = call_ttrace (TT_LWP_RDTEXT, | |
c5aa993b JM |
5071 | inferior_pid, |
5072 | ((TTRACE_ARG_TYPE) | |
5073 | (addr + (count - 1) * sizeof (TTRACE_XFER_TYPE))), | |
5074 | TT_NIL, | |
5075 | TT_NIL); | |
c906108c SS |
5076 | } |
5077 | ||
5078 | /* Copy data to be written over corresponding part of buffer */ | |
5079 | ||
5080 | memcpy ((char *) buffer + (memaddr & (sizeof (TTRACE_XFER_TYPE) - 1)), | |
5081 | myaddr, | |
5082 | len); | |
5083 | ||
5084 | /* Write the entire buffer. */ | |
5085 | ||
5086 | for (i = 0; i < count; i++, addr += sizeof (TTRACE_XFER_TYPE)) | |
5087 | { | |
5088 | errno = 0; | |
5089 | call_ttrace (TT_LWP_WRDATA, | |
c5aa993b JM |
5090 | inferior_pid, |
5091 | (TTRACE_ARG_TYPE) addr, | |
5092 | (TTRACE_ARG_TYPE) buffer[i], | |
5093 | TT_NIL); | |
c906108c SS |
5094 | if (errno) |
5095 | { | |
5096 | /* Using the appropriate one (I or D) is necessary for | |
c5aa993b | 5097 | Gould NP1, at least. */ |
c906108c SS |
5098 | errno = 0; |
5099 | call_ttrace (TT_LWP_WRTEXT, | |
c5aa993b JM |
5100 | inferior_pid, |
5101 | (TTRACE_ARG_TYPE) addr, | |
5102 | (TTRACE_ARG_TYPE) buffer[i], | |
5103 | TT_NIL); | |
c906108c SS |
5104 | } |
5105 | if (errno) | |
5106 | return 0; | |
5107 | } | |
5108 | } | |
5109 | else | |
5110 | { | |
5111 | /* Read all the longwords */ | |
5112 | for (i = 0; i < count; i++, addr += sizeof (TTRACE_XFER_TYPE)) | |
5113 | { | |
5114 | errno = 0; | |
5115 | buffer[i] = call_ttrace (TT_LWP_RDTEXT, | |
c5aa993b JM |
5116 | inferior_pid, |
5117 | (TTRACE_ARG_TYPE) addr, | |
5118 | TT_NIL, | |
5119 | TT_NIL); | |
c906108c SS |
5120 | if (errno) |
5121 | return 0; | |
5122 | QUIT; | |
5123 | } | |
5124 | ||
5125 | /* Copy appropriate bytes out of the buffer. */ | |
5126 | memcpy (myaddr, | |
5127 | (char *) buffer + (memaddr & (sizeof (TTRACE_XFER_TYPE) - 1)), | |
5128 | len); | |
5129 | } | |
5130 | return len; | |
5131 | } | |
c906108c | 5132 | \f |
c5aa993b | 5133 | |
c906108c SS |
5134 | static void |
5135 | udot_info () | |
5136 | { | |
c5aa993b JM |
5137 | int udot_off; /* Offset into user struct */ |
5138 | int udot_val; /* Value from user struct at udot_off */ | |
5139 | char mess[128]; /* For messages */ | |
c906108c | 5140 | |
c5aa993b JM |
5141 | if (!target_has_execution) |
5142 | { | |
5143 | error ("The program is not being run."); | |
5144 | } | |
c906108c SS |
5145 | |
5146 | #if !defined (KERNEL_U_SIZE) | |
5147 | ||
5148 | /* Adding support for this command is easy. Typically you just add a | |
5149 | routine, called "kernel_u_size" that returns the size of the user | |
5150 | struct, to the appropriate *-nat.c file and then add to the native | |
5151 | config file "#define KERNEL_U_SIZE kernel_u_size()" */ | |
5152 | error ("Don't know how large ``struct user'' is in this version of gdb."); | |
5153 | ||
5154 | #else | |
5155 | ||
5156 | for (udot_off = 0; udot_off < KERNEL_U_SIZE; udot_off += sizeof (udot_val)) | |
5157 | { | |
5158 | if ((udot_off % 24) == 0) | |
5159 | { | |
5160 | if (udot_off > 0) | |
5161 | { | |
5162 | printf_filtered ("\n"); | |
5163 | } | |
5164 | printf_filtered ("%04x:", udot_off); | |
5165 | } | |
5166 | udot_val = call_ttrace (TT_LWP_RUREGS, | |
c5aa993b JM |
5167 | inferior_pid, |
5168 | (TTRACE_ARG_TYPE) udot_off, | |
5169 | TT_NIL, | |
5170 | TT_NIL); | |
c906108c SS |
5171 | if (errno != 0) |
5172 | { | |
5173 | sprintf (mess, "\nreading user struct at offset 0x%x", udot_off); | |
5174 | perror_with_name (mess); | |
5175 | } | |
5176 | /* Avoid using nonportable (?) "*" in print specs */ | |
5177 | printf_filtered (sizeof (int) == 4 ? " 0x%08x" : " 0x%16x", udot_val); | |
5178 | } | |
5179 | printf_filtered ("\n"); | |
5180 | ||
5181 | #endif | |
5182 | } | |
5183 | #endif /* !defined (CHILD_XFER_MEMORY). */ | |
5184 | ||
5185 | /* TTrace version of "target_pid_to_exec_file" | |
5186 | */ | |
5187 | char * | |
5188 | child_pid_to_exec_file (tid) | |
c5aa993b | 5189 | int tid; |
c906108c | 5190 | { |
c5aa993b JM |
5191 | static char exec_file_buffer[1024]; |
5192 | int tt_status; | |
5193 | CORE_ADDR top_of_stack; | |
5194 | char four_chars[4]; | |
5195 | int name_index; | |
5196 | int i; | |
5197 | int done; | |
5198 | int saved_inferior_pid; | |
5199 | ||
c906108c SS |
5200 | /* As of 10.x HP-UX, there's an explicit request to get the |
5201 | *pathname. | |
5202 | */ | |
5203 | tt_status = call_ttrace (TT_PROC_GET_PATHNAME, | |
c5aa993b JM |
5204 | tid, |
5205 | (TTRACE_ARG_TYPE) exec_file_buffer, | |
5206 | (TTRACE_ARG_TYPE) sizeof (exec_file_buffer) - 1, | |
5207 | TT_NIL); | |
c906108c SS |
5208 | if (tt_status >= 0) |
5209 | return exec_file_buffer; | |
5210 | ||
5211 | /* ??rehrauer: The above request may or may not be broken. It | |
5212 | doesn't seem to work when I use it. But, it may be designed | |
5213 | to only work immediately after an exec event occurs. (I'm | |
5214 | waiting for COSL to explain.) | |
5215 | ||
5216 | In any case, if it fails, try a really, truly amazingly gross | |
5217 | hack that DDE uses, of pawing through the process' data | |
5218 | segment to find the pathname. | |
c5aa993b | 5219 | */ |
c906108c SS |
5220 | top_of_stack = 0x7b03a000; |
5221 | name_index = 0; | |
5222 | done = 0; | |
5223 | ||
5224 | /* On the chance that pid != inferior_pid, set inferior_pid | |
5225 | to pid, so that (grrrr!) implicit uses of inferior_pid get | |
5226 | the right id. | |
c5aa993b | 5227 | */ |
c906108c SS |
5228 | saved_inferior_pid = inferior_pid; |
5229 | inferior_pid = tid; | |
5230 | ||
5231 | /* Try to grab a null-terminated string. */ | |
c5aa993b JM |
5232 | while (!done) |
5233 | { | |
5234 | if (target_read_memory (top_of_stack, four_chars, 4) != 0) | |
5235 | { | |
5236 | inferior_pid = saved_inferior_pid; | |
5237 | return NULL; | |
5238 | } | |
5239 | for (i = 0; i < 4; i++) | |
5240 | { | |
5241 | exec_file_buffer[name_index++] = four_chars[i]; | |
5242 | done = (four_chars[i] == '\0'); | |
5243 | if (done) | |
5244 | break; | |
5245 | } | |
5246 | top_of_stack += 4; | |
5247 | } | |
c906108c SS |
5248 | |
5249 | if (exec_file_buffer[0] == '\0') | |
5250 | { | |
5251 | inferior_pid = saved_inferior_pid; | |
5252 | return NULL; | |
5253 | } | |
5254 | ||
5255 | inferior_pid = saved_inferior_pid; | |
5256 | return exec_file_buffer; | |
5257 | } | |
5258 | ||
5259 | ||
5260 | void | |
5261 | pre_fork_inferior () | |
5262 | { | |
c5aa993b | 5263 | int status; |
c906108c SS |
5264 | |
5265 | status = pipe (startup_semaphore.parent_channel); | |
c5aa993b JM |
5266 | if (status < 0) |
5267 | { | |
c906108c SS |
5268 | warning ("error getting parent pipe for startup semaphore"); |
5269 | return; | |
c5aa993b | 5270 | } |
c906108c SS |
5271 | |
5272 | status = pipe (startup_semaphore.child_channel); | |
c5aa993b JM |
5273 | if (status < 0) |
5274 | { | |
c906108c SS |
5275 | warning ("error getting child pipe for startup semaphore"); |
5276 | return; | |
c5aa993b | 5277 | } |
c906108c SS |
5278 | } |
5279 | ||
5280 | /* Called via #define REQUIRE_ATTACH from inftarg.c, | |
5281 | * ultimately from "follow_inferior_fork" in infrun.c, | |
5282 | * itself called from "resume". | |
5283 | * | |
5284 | * This seems to be intended to attach after a fork or | |
5285 | * vfork, while "attach" is used to attach to a pid | |
5286 | * given by the user. The check for an existing attach | |
5287 | * seems odd--it always fails in our test system. | |
5288 | */ | |
5289 | int | |
5290 | hppa_require_attach (pid) | |
c5aa993b | 5291 | int pid; |
c906108c | 5292 | { |
c5aa993b JM |
5293 | int tt_status; |
5294 | CORE_ADDR pc; | |
5295 | CORE_ADDR pc_addr; | |
5296 | unsigned int regs_offset; | |
c906108c | 5297 | process_state_t old_process_state = process_state; |
c5aa993b | 5298 | |
c906108c SS |
5299 | /* Are we already attached? There appears to be no explicit |
5300 | * way to answer this via ttrace, so we try something which | |
5301 | * should be innocuous if we are attached. If that fails, | |
5302 | * then we assume we're not attached, and so attempt to make | |
5303 | * it so. | |
5304 | */ | |
5305 | errno = 0; | |
5306 | tt_status = call_real_ttrace (TT_PROC_STOP, | |
c5aa993b JM |
5307 | pid, |
5308 | (lwpid_t) TT_NIL, | |
5309 | (TTRACE_ARG_TYPE) TT_NIL, | |
5310 | (TTRACE_ARG_TYPE) TT_NIL, | |
5311 | TT_NIL); | |
5312 | ||
c906108c SS |
5313 | if (errno) |
5314 | { | |
5315 | /* No change to process-state! | |
5316 | */ | |
5317 | errno = 0; | |
c5aa993b | 5318 | pid = attach (pid); |
c906108c SS |
5319 | } |
5320 | else | |
5321 | { | |
c5aa993b JM |
5322 | /* If successful, the process is now stopped. But if |
5323 | * we're VFORKING, the parent is still running, so don't | |
5324 | * change the process state. | |
5325 | */ | |
5326 | if (process_state != VFORKING) | |
5327 | process_state = STOPPED; | |
5328 | ||
5329 | /* If we were already attached, you'd think that we | |
5330 | * would need to start going again--but you'd be wrong, | |
5331 | * as the fork-following code is actually in the middle | |
5332 | * of the "resume" routine in in "infrun.c" and so | |
5333 | * will (almost) immediately do a resume. | |
5334 | * | |
5335 | * On the other hand, if we are VFORKING, which means | |
5336 | * that the child and the parent share a process for a | |
5337 | * while, we know that "resume" won't be resuming | |
5338 | * until the child EXEC event is seen. But we still | |
5339 | * don't want to continue, as the event is already | |
5340 | * there waiting. | |
5341 | */ | |
5342 | update_thread_state_after_attach (pid, DONT_ATTACH_CONTINUE); | |
5343 | } /* STOP succeeded */ | |
5344 | ||
c906108c SS |
5345 | return pid; |
5346 | } | |
5347 | ||
5348 | int | |
5349 | hppa_require_detach (pid, signal) | |
c5aa993b JM |
5350 | int pid; |
5351 | int signal; | |
c906108c | 5352 | { |
c5aa993b | 5353 | int tt_status; |
c906108c SS |
5354 | |
5355 | /* If signal is non-zero, we must pass the signal on to the active | |
5356 | thread prior to detaching. We do this by continuing the threads | |
5357 | with the signal. | |
5358 | */ | |
5359 | if (signal != 0) | |
5360 | { | |
5361 | errno = 0; | |
c5aa993b | 5362 | threads_continue_all_with_signals (pid, signal); |
c906108c SS |
5363 | } |
5364 | ||
5365 | errno = 0; | |
5366 | tt_status = call_ttrace (TT_PROC_DETACH, | |
c5aa993b JM |
5367 | pid, |
5368 | TT_NIL, | |
5369 | TT_NIL, | |
5370 | TT_NIL); | |
c906108c | 5371 | |
c5aa993b | 5372 | errno = 0; /* Ignore any errors. */ |
c906108c SS |
5373 | |
5374 | /* process_state? */ | |
c5aa993b | 5375 | |
c906108c SS |
5376 | return pid; |
5377 | } | |
5378 | ||
5379 | /* Given the starting address of a memory page, hash it to a bucket in | |
5380 | the memory page dictionary. | |
c5aa993b | 5381 | */ |
c906108c SS |
5382 | static int |
5383 | get_dictionary_bucket_of_page (page_start) | |
c5aa993b | 5384 | CORE_ADDR page_start; |
c906108c | 5385 | { |
c5aa993b | 5386 | int hash; |
c906108c SS |
5387 | |
5388 | hash = (page_start / memory_page_dictionary.page_size); | |
5389 | hash = hash % MEMORY_PAGE_DICTIONARY_BUCKET_COUNT; | |
5390 | ||
5391 | return hash; | |
5392 | } | |
5393 | ||
5394 | ||
5395 | /* Given a memory page's starting address, get (i.e., find an existing | |
5396 | or create a new) dictionary entry for the page. The page will be | |
5397 | write-protected when this function returns, but may have a reference | |
5398 | count of 0 (if the page was newly-added to the dictionary). | |
c5aa993b | 5399 | */ |
c906108c SS |
5400 | static memory_page_t * |
5401 | get_dictionary_entry_of_page (pid, page_start) | |
c5aa993b JM |
5402 | int pid; |
5403 | CORE_ADDR page_start; | |
c906108c | 5404 | { |
c5aa993b JM |
5405 | int bucket; |
5406 | memory_page_t *page = NULL; | |
5407 | memory_page_t *previous_page = NULL; | |
c906108c SS |
5408 | |
5409 | /* We're going to be using the dictionary now, than-kew. */ | |
5410 | require_memory_page_dictionary (pid); | |
5411 | ||
5412 | /* Try to find an existing dictionary entry for this page. Hash | |
5413 | on the page's starting address. | |
c5aa993b | 5414 | */ |
c906108c SS |
5415 | bucket = get_dictionary_bucket_of_page (page_start); |
5416 | page = &memory_page_dictionary.buckets[bucket]; | |
5417 | while (page != NULL) | |
5418 | { | |
5419 | if (page->page_start == page_start) | |
c5aa993b | 5420 | break; |
c906108c SS |
5421 | previous_page = page; |
5422 | page = page->next; | |
5423 | } | |
5424 | ||
5425 | /* Did we find a dictionary entry for this page? If not, then | |
5426 | add it to the dictionary now. | |
c5aa993b | 5427 | */ |
c906108c SS |
5428 | if (page == NULL) |
5429 | { | |
5430 | /* Create a new entry. */ | |
5431 | page = (memory_page_t *) xmalloc (sizeof (memory_page_t)); | |
5432 | page->page_start = page_start; | |
5433 | page->reference_count = 0; | |
5434 | page->next = NULL; | |
5435 | page->previous = NULL; | |
5436 | ||
5437 | /* We'll write-protect the page now, if that's allowed. */ | |
5438 | page->original_permissions = write_protect_page (pid, page_start); | |
5439 | ||
5440 | /* Add the new entry to the dictionary. */ | |
5441 | page->previous = previous_page; | |
5442 | previous_page->next = page; | |
5443 | ||
5444 | memory_page_dictionary.page_count++; | |
5445 | } | |
5446 | ||
5447 | return page; | |
5448 | } | |
5449 | ||
5450 | ||
5451 | static void | |
5452 | remove_dictionary_entry_of_page (pid, page) | |
c5aa993b JM |
5453 | int pid; |
5454 | memory_page_t *page; | |
c906108c SS |
5455 | { |
5456 | /* Restore the page's original permissions. */ | |
5457 | unwrite_protect_page (pid, page->page_start, page->original_permissions); | |
5458 | ||
5459 | /* Kick the page out of the dictionary. */ | |
5460 | if (page->previous != NULL) | |
5461 | page->previous->next = page->next; | |
5462 | if (page->next != NULL) | |
5463 | page->next->previous = page->previous; | |
5464 | ||
5465 | /* Just in case someone retains a handle to this after it's freed. */ | |
5466 | page->page_start = (CORE_ADDR) 0; | |
5467 | ||
5468 | memory_page_dictionary.page_count--; | |
5469 | ||
5470 | free (page); | |
5471 | } | |
5472 | ||
5473 | ||
5474 | static void | |
5475 | hppa_enable_syscall_events (pid) | |
c5aa993b | 5476 | int pid; |
c906108c | 5477 | { |
c5aa993b JM |
5478 | int tt_status; |
5479 | ttevent_t ttrace_events; | |
c906108c SS |
5480 | |
5481 | /* Get the set of events that are currently enabled. */ | |
5482 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
5483 | pid, |
5484 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5485 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5486 | TT_NIL); | |
c906108c SS |
5487 | if (errno) |
5488 | perror_with_name ("ttrace"); | |
5489 | ||
5490 | /* Add syscall events to that set. */ | |
5491 | ttrace_events.tte_events |= TTEVT_SYSCALL_ENTRY; | |
5492 | ttrace_events.tte_events |= TTEVT_SYSCALL_RETURN; | |
5493 | ||
5494 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
5495 | pid, |
5496 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5497 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5498 | TT_NIL); | |
c906108c SS |
5499 | if (errno) |
5500 | perror_with_name ("ttrace"); | |
5501 | } | |
5502 | ||
5503 | ||
5504 | static void | |
5505 | hppa_disable_syscall_events (pid) | |
c5aa993b | 5506 | int pid; |
c906108c | 5507 | { |
c5aa993b JM |
5508 | int tt_status; |
5509 | ttevent_t ttrace_events; | |
c906108c SS |
5510 | |
5511 | /* Get the set of events that are currently enabled. */ | |
5512 | tt_status = call_ttrace (TT_PROC_GET_EVENT_MASK, | |
c5aa993b JM |
5513 | pid, |
5514 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5515 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5516 | TT_NIL); | |
c906108c SS |
5517 | if (errno) |
5518 | perror_with_name ("ttrace"); | |
5519 | ||
5520 | /* Remove syscall events from that set. */ | |
5521 | ttrace_events.tte_events &= ~TTEVT_SYSCALL_ENTRY; | |
5522 | ttrace_events.tte_events &= ~TTEVT_SYSCALL_RETURN; | |
5523 | ||
5524 | tt_status = call_ttrace (TT_PROC_SET_EVENT_MASK, | |
c5aa993b JM |
5525 | pid, |
5526 | (TTRACE_ARG_TYPE) & ttrace_events, | |
5527 | (TTRACE_ARG_TYPE) sizeof (ttrace_events), | |
5528 | TT_NIL); | |
c906108c SS |
5529 | if (errno) |
5530 | perror_with_name ("ttrace"); | |
5531 | } | |
5532 | ||
5533 | ||
5534 | /* The address range beginning with START and ending with START+LEN-1 | |
5535 | (inclusive) is to be watched via page-protection by a new watchpoint. | |
5536 | Set protection for all pages that overlap that range. | |
5537 | ||
5538 | Note that our caller sets TYPE to: | |
c5aa993b JM |
5539 | 0 for a bp_hardware_watchpoint, |
5540 | 1 for a bp_read_watchpoint, | |
5541 | 2 for a bp_access_watchpoint | |
c906108c SS |
5542 | |
5543 | (Yes, this is intentionally (though lord only knows why) different | |
5544 | from the TYPE that is passed to hppa_remove_hw_watchpoint.) | |
c5aa993b | 5545 | */ |
c906108c SS |
5546 | int |
5547 | hppa_insert_hw_watchpoint (pid, start, len, type) | |
c5aa993b JM |
5548 | int pid; |
5549 | CORE_ADDR start; | |
5550 | LONGEST len; | |
5551 | int type; | |
c906108c | 5552 | { |
c5aa993b JM |
5553 | CORE_ADDR page_start; |
5554 | int dictionary_was_empty; | |
5555 | int page_size; | |
5556 | int page_id; | |
5557 | LONGEST range_size_in_pages; | |
c906108c SS |
5558 | |
5559 | if (type != 0) | |
5560 | error ("read or access hardware watchpoints not supported on HP-UX"); | |
5561 | ||
5562 | /* Examine all pages in the address range. */ | |
5563 | require_memory_page_dictionary (); | |
5564 | ||
5565 | dictionary_was_empty = (memory_page_dictionary.page_count == (LONGEST) 0); | |
5566 | ||
5567 | page_size = memory_page_dictionary.page_size; | |
5568 | page_start = (start / page_size) * page_size; | |
5569 | range_size_in_pages = ((LONGEST) len + (LONGEST) page_size - 1) / (LONGEST) page_size; | |
5570 | ||
c5aa993b | 5571 | for (page_id = 0; page_id < range_size_in_pages; page_id++, page_start += page_size) |
c906108c | 5572 | { |
c5aa993b | 5573 | memory_page_t *page; |
c906108c SS |
5574 | |
5575 | /* This gets the page entered into the dictionary if it was | |
5576 | not already entered. | |
c5aa993b | 5577 | */ |
c906108c SS |
5578 | page = get_dictionary_entry_of_page (pid, page_start); |
5579 | page->reference_count++; | |
5580 | } | |
5581 | ||
5582 | /* Our implementation depends on seeing calls to kernel code, for the | |
5583 | following reason. Here we ask to be notified of syscalls. | |
5584 | ||
5585 | When a protected page is accessed by user code, HP-UX raises a SIGBUS. | |
5586 | Fine. | |
5587 | ||
5588 | But when kernel code accesses the page, it doesn't give a SIGBUS. | |
5589 | Rather, the system call that touched the page fails, with errno=EFAULT. | |
5590 | Not good for us. | |
5591 | ||
5592 | We could accomodate this "feature" by asking to be notified of syscall | |
5593 | entries & exits; upon getting an entry event, disabling page-protections; | |
5594 | upon getting an exit event, reenabling page-protections and then checking | |
5595 | if any watchpoints triggered. | |
5596 | ||
5597 | However, this turns out to be a real performance loser. syscalls are | |
5598 | usually a frequent occurrence. Having to unprotect-reprotect all watched | |
5599 | pages, and also to then read all watched memory locations and compare for | |
5600 | triggers, can be quite expensive. | |
5601 | ||
5602 | Instead, we'll only ask to be notified of syscall exits. When we get | |
5603 | one, we'll check whether errno is set. If not, or if it's not EFAULT, | |
5604 | we can just continue the inferior. | |
5605 | ||
5606 | If errno is set upon syscall exit to EFAULT, we must perform some fairly | |
5607 | hackish stuff to determine whether the failure really was due to a | |
5608 | page-protect trap on a watched location. | |
c5aa993b | 5609 | */ |
c906108c SS |
5610 | if (dictionary_was_empty) |
5611 | hppa_enable_syscall_events (pid); | |
5612 | ||
5613 | return 1; | |
5614 | } | |
5615 | ||
5616 | ||
5617 | /* The address range beginning with START and ending with START+LEN-1 | |
5618 | (inclusive) was being watched via page-protection by a watchpoint | |
5619 | which has been removed. Remove protection for all pages that | |
5620 | overlap that range, which are not also being watched by other | |
5621 | watchpoints. | |
c5aa993b | 5622 | */ |
c906108c SS |
5623 | int |
5624 | hppa_remove_hw_watchpoint (pid, start, len, type) | |
c5aa993b JM |
5625 | int pid; |
5626 | CORE_ADDR start; | |
5627 | LONGEST len; | |
5628 | enum bptype type; | |
c906108c | 5629 | { |
c5aa993b JM |
5630 | CORE_ADDR page_start; |
5631 | int dictionary_is_empty; | |
5632 | int page_size; | |
5633 | int page_id; | |
5634 | LONGEST range_size_in_pages; | |
c906108c SS |
5635 | |
5636 | if (type != 0) | |
5637 | error ("read or access hardware watchpoints not supported on HP-UX"); | |
5638 | ||
5639 | /* Examine all pages in the address range. */ | |
5640 | require_memory_page_dictionary (); | |
5641 | ||
5642 | page_size = memory_page_dictionary.page_size; | |
5643 | page_start = (start / page_size) * page_size; | |
5644 | range_size_in_pages = ((LONGEST) len + (LONGEST) page_size - 1) / (LONGEST) page_size; | |
5645 | ||
c5aa993b | 5646 | for (page_id = 0; page_id < range_size_in_pages; page_id++, page_start += page_size) |
c906108c | 5647 | { |
c5aa993b | 5648 | memory_page_t *page; |
c906108c SS |
5649 | |
5650 | page = get_dictionary_entry_of_page (pid, page_start); | |
5651 | page->reference_count--; | |
5652 | ||
5653 | /* Was this the last reference of this page? If so, then we | |
5654 | must scrub the entry from the dictionary, and also restore | |
5655 | the page's original permissions. | |
c5aa993b | 5656 | */ |
c906108c | 5657 | if (page->reference_count == 0) |
c5aa993b | 5658 | remove_dictionary_entry_of_page (pid, page); |
c906108c SS |
5659 | } |
5660 | ||
5661 | dictionary_is_empty = (memory_page_dictionary.page_count == (LONGEST) 0); | |
5662 | ||
5663 | /* If write protections are currently disallowed, then that implies that | |
5664 | wait_for_inferior believes that the inferior is within a system call. | |
5665 | Since we want to see both syscall entry and return, it's clearly not | |
5666 | good to disable syscall events in this state! | |
5667 | ||
5668 | ??rehrauer: Yeah, it'd be better if we had a specific flag that said, | |
5669 | "inferior is between syscall events now". Oh well. | |
c5aa993b | 5670 | */ |
c906108c SS |
5671 | if (dictionary_is_empty && memory_page_dictionary.page_protections_allowed) |
5672 | hppa_disable_syscall_events (pid); | |
5673 | ||
5674 | return 1; | |
5675 | } | |
5676 | ||
5677 | ||
5678 | /* Could we implement a watchpoint of this type via our available | |
5679 | hardware support? | |
5680 | ||
5681 | This query does not consider whether a particular address range | |
5682 | could be so watched, but just whether support is generally available | |
5683 | for such things. See hppa_range_profitable_for_hw_watchpoint for a | |
5684 | query that answers whether a particular range should be watched via | |
5685 | hardware support. | |
c5aa993b | 5686 | */ |
c906108c SS |
5687 | int |
5688 | hppa_can_use_hw_watchpoint (type, cnt, ot) | |
c5aa993b JM |
5689 | enum bptype type; |
5690 | int cnt; | |
5691 | enum bptype ot; | |
c906108c SS |
5692 | { |
5693 | return (type == bp_hardware_watchpoint); | |
5694 | } | |
5695 | ||
5696 | ||
5697 | /* Assuming we could set a hardware watchpoint on this address, do | |
5698 | we think it would be profitable ("a good idea") to do so? If not, | |
5699 | we can always set a regular (aka single-step & test) watchpoint | |
5700 | on the address... | |
c5aa993b | 5701 | */ |
c906108c SS |
5702 | int |
5703 | hppa_range_profitable_for_hw_watchpoint (pid, start, len) | |
c5aa993b JM |
5704 | int pid; |
5705 | CORE_ADDR start; | |
5706 | LONGEST len; | |
c906108c | 5707 | { |
c5aa993b JM |
5708 | int range_is_stack_based; |
5709 | int range_is_accessible; | |
5710 | CORE_ADDR page_start; | |
5711 | int page_size; | |
5712 | int page; | |
5713 | LONGEST range_size_in_pages; | |
c906108c SS |
5714 | |
5715 | /* ??rehrauer: For now, say that all addresses are potentially | |
5716 | profitable. Possibly later we'll want to test the address | |
5717 | for "stackness"? | |
c5aa993b | 5718 | */ |
c906108c SS |
5719 | range_is_stack_based = 0; |
5720 | ||
5721 | /* If any page in the range is inaccessible, then we cannot | |
5722 | really use hardware watchpointing, even though our client | |
5723 | thinks we can. In that case, it's actually an error to | |
5724 | attempt to use hw watchpoints, so we'll tell our client | |
5725 | that the range is "unprofitable", and hope that they listen... | |
c5aa993b JM |
5726 | */ |
5727 | range_is_accessible = 1; /* Until proven otherwise. */ | |
c906108c SS |
5728 | |
5729 | /* Examine all pages in the address range. */ | |
5730 | errno = 0; | |
5731 | page_size = sysconf (_SC_PAGE_SIZE); | |
5732 | ||
5733 | /* If we can't determine page size, we're hosed. Tell our | |
5734 | client it's unprofitable to use hw watchpoints for this | |
5735 | range. | |
c5aa993b | 5736 | */ |
c906108c SS |
5737 | if (errno || (page_size <= 0)) |
5738 | { | |
5739 | errno = 0; | |
5740 | return 0; | |
5741 | } | |
5742 | ||
5743 | page_start = (start / page_size) * page_size; | |
c5aa993b | 5744 | range_size_in_pages = len / (LONGEST) page_size; |
c906108c | 5745 | |
c5aa993b | 5746 | for (page = 0; page < range_size_in_pages; page++, page_start += page_size) |
c906108c | 5747 | { |
c5aa993b JM |
5748 | int tt_status; |
5749 | int page_permissions; | |
c906108c SS |
5750 | |
5751 | /* Is this page accessible? */ | |
5752 | errno = 0; | |
5753 | tt_status = call_ttrace (TT_PROC_GET_MPROTECT, | |
c5aa993b JM |
5754 | pid, |
5755 | (TTRACE_ARG_TYPE) page_start, | |
5756 | TT_NIL, | |
5757 | (TTRACE_ARG_TYPE) & page_permissions); | |
c906108c | 5758 | if (errno || (tt_status < 0)) |
c5aa993b JM |
5759 | { |
5760 | errno = 0; | |
5761 | range_is_accessible = 0; | |
5762 | break; | |
5763 | } | |
c906108c SS |
5764 | |
5765 | /* Yes, go for another... */ | |
5766 | } | |
5767 | ||
c5aa993b | 5768 | return (!range_is_stack_based && range_is_accessible); |
c906108c SS |
5769 | } |
5770 | ||
5771 | ||
5772 | char * | |
5773 | hppa_pid_or_tid_to_str (id) | |
c5aa993b | 5774 | pid_t id; |
c906108c | 5775 | { |
c5aa993b | 5776 | static char buf[100]; /* Static because address returned. */ |
c906108c SS |
5777 | |
5778 | /* Does this appear to be a process? If so, print it that way. */ | |
5779 | if (is_process_id (id)) | |
5780 | return hppa_pid_to_str (id); | |
5781 | ||
5782 | /* Else, print both the GDB thread number and the system thread id. */ | |
5783 | sprintf (buf, "thread %d (", pid_to_thread_id (id)); | |
5784 | strcat (buf, hppa_tid_to_str (id)); | |
5785 | strcat (buf, ")\0"); | |
5786 | ||
5787 | return buf; | |
5788 | } | |
c906108c | 5789 | \f |
c5aa993b | 5790 | |
c906108c SS |
5791 | /* If the current pid is not the pid this module reported |
5792 | * from "ptrace_wait" with the most recent event, then the | |
5793 | * user has switched threads. | |
5794 | * | |
5795 | * If the last reported event was a breakpoint, then return | |
5796 | * the old thread id, else return 0. | |
5797 | */ | |
c5aa993b JM |
5798 | pid_t |
5799 | hppa_switched_threads (gdb_pid) | |
5800 | pid_t gdb_pid; | |
c906108c | 5801 | { |
c5aa993b JM |
5802 | if (gdb_pid == old_gdb_pid) |
5803 | { | |
c906108c SS |
5804 | /* |
5805 | * Core gdb is working with the same pid that it | |
5806 | * was before we reported the last event. This | |
5807 | * is ok: e.g. we reported hitting a thread-specific | |
5808 | * breakpoint, but we were reporting the wrong | |
5809 | * thread, so the core just ignored the event. | |
5810 | * | |
5811 | * No thread switch has happened. | |
5812 | */ | |
5813 | return (pid_t) 0; | |
c5aa993b JM |
5814 | } |
5815 | else if (gdb_pid == reported_pid) | |
5816 | { | |
c906108c SS |
5817 | /* |
5818 | * Core gdb is working with the pid we reported, so | |
5819 | * any continue or step will be able to figure out | |
5820 | * that it needs to step over any hit breakpoints | |
5821 | * without our (i.e. PREPARE_TO_PROCEED's) help. | |
5822 | */ | |
5823 | return (pid_t) 0; | |
c5aa993b JM |
5824 | } |
5825 | else if (!reported_bpt) | |
5826 | { | |
5827 | /* | |
5828 | * The core switched, but we didn't just report a | |
5829 | * breakpoint, so there's no just-hit breakpoint | |
5830 | * instruction at "reported_pid"'s PC, and thus there | |
5831 | * is no need to step over it. | |
5832 | */ | |
c906108c | 5833 | return (pid_t) 0; |
c5aa993b JM |
5834 | } |
5835 | else | |
5836 | { | |
5837 | /* There's been a real switch, and we reported | |
5838 | * a hit breakpoint. Let "hppa_prepare_to_proceed" | |
5839 | * know, so it can see whether the breakpoint is | |
5840 | * still active. | |
5841 | */ | |
5842 | return reported_pid; | |
5843 | } | |
c906108c SS |
5844 | |
5845 | /* Keep compiler happy with an obvious return at the end. | |
5846 | */ | |
c5aa993b | 5847 | return (pid_t) 0; |
c906108c SS |
5848 | } |
5849 | ||
5850 | void | |
5851 | hppa_ensure_vforking_parent_remains_stopped (pid) | |
c5aa993b | 5852 | int pid; |
c906108c SS |
5853 | { |
5854 | /* Nothing to do when using ttrace. Only the ptrace-based implementation | |
5855 | must do real work. | |
5856 | */ | |
5857 | } | |
5858 | ||
5859 | ||
5860 | int | |
5861 | hppa_resume_execd_vforking_child_to_get_parent_vfork () | |
5862 | { | |
c5aa993b | 5863 | return 0; /* No, the parent vfork is available now. */ |
c906108c | 5864 | } |
c5aa993b | 5865 | \f |
c906108c SS |
5866 | |
5867 | ||
c906108c SS |
5868 | void |
5869 | _initialize_infttrace () | |
5870 | { | |
5871 | /* Initialize the ttrace-based hardware watchpoint implementation. */ | |
c5aa993b | 5872 | memory_page_dictionary.page_count = (LONGEST) - 1; |
c906108c SS |
5873 | memory_page_dictionary.page_protections_allowed = 1; |
5874 | ||
5875 | errno = 0; | |
5876 | memory_page_dictionary.page_size = sysconf (_SC_PAGE_SIZE); | |
5877 | ||
5878 | if (errno || (memory_page_dictionary.page_size <= 0)) | |
5879 | perror_with_name ("sysconf"); | |
5880 | } |