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