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