1 /* thread_db.h -- interface to libthread_db.so library for debugging -lpthread
2 Copyright (C) 1999-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
20 #define _THREAD_DB_H 1
22 /* This is the debugger interface for the NPTL library. It is
23 modelled closely after the interface with same names in Solaris
24 with the goal to share the same code in the debugger. */
27 #include <sys/types.h>
28 #include <sys/procfs.h>
31 /* Error codes of the library. */
34 TD_OK, /* No error. */
35 TD_ERR, /* No further specified error. */
36 TD_NOTHR, /* No matching thread found. */
37 TD_NOSV, /* No matching synchronization handle found. */
38 TD_NOLWP, /* No matching light-weighted process found. */
39 TD_BADPH, /* Invalid process handle. */
40 TD_BADTH, /* Invalid thread handle. */
41 TD_BADSH, /* Invalid synchronization handle. */
42 TD_BADTA, /* Invalid thread agent. */
43 TD_BADKEY, /* Invalid key. */
44 TD_NOMSG, /* No event available. */
45 TD_NOFPREGS, /* No floating-point register content available. */
46 TD_NOLIBTHREAD, /* Application not linked with thread library. */
47 TD_NOEVENT, /* Requested event is not supported. */
48 TD_NOCAPAB, /* Capability not available. */
49 TD_DBERR, /* Internal debug library error. */
50 TD_NOAPLIC, /* Operation is not applicable. */
51 TD_NOTSD, /* No thread-specific data available. */
52 TD_MALLOC, /* Out of memory. */
53 TD_PARTIALREG, /* Not entire register set was read or written. */
54 TD_NOXREGS, /* X register set not available for given thread. */
55 TD_TLSDEFER, /* Thread has not yet allocated TLS for given module. */
56 TD_NOTALLOC = TD_TLSDEFER,
57 TD_VERSION, /* Version if libpthread and libthread_db do not match. */
58 TD_NOTLS /* There is no TLS segment in the given module. */
62 /* Possible thread states. TD_THR_ANY_STATE is a pseudo-state used to
63 select threads regardless of state in td_ta_thr_iter(). */
76 /* Thread type: user or system. TD_THR_ANY_TYPE is a pseudo-type used
77 to select threads regardless of type in td_ta_thr_iter(). */
86 /* Types of the debugging library. */
88 /* Handle for a process. This type is opaque. */
89 typedef struct td_thragent td_thragent_t;
91 /* The actual thread handle type. This is also opaque. */
92 typedef struct td_thrhandle
94 td_thragent_t *th_ta_p;
99 /* Forward declaration of a type defined by and for the dynamic linker. */
103 /* Flags for `td_ta_thr_iter'. */
104 #define TD_THR_ANY_USER_FLAGS 0xffffffff
105 #define TD_THR_LOWEST_PRIORITY -20
106 #define TD_SIGNO_MASK NULL
109 #define TD_EVENTSIZE 2
110 #define BT_UISHIFT 5 /* log base 2 of BT_NBIPUI, to extract word index */
111 #define BT_NBIPUI (1 << BT_UISHIFT) /* n bits per uint */
112 #define BT_UIMASK (BT_NBIPUI - 1) /* to extract bit index */
114 /* Bitmask of enabled events. */
115 typedef struct td_thr_events
117 uint32_t event_bits[TD_EVENTSIZE];
120 /* Event set manipulation macros. */
121 #define __td_eventmask(n) \
122 (UINT32_C (1) << (((n) - 1) & BT_UIMASK))
123 #define __td_eventword(n) \
124 ((UINT32_C ((n) - 1)) >> BT_UISHIFT)
126 #define td_event_emptyset(setp) \
129 for (__i = TD_EVENTSIZE; __i > 0; --__i) \
130 (setp)->event_bits[__i - 1] = 0; \
133 #define td_event_fillset(setp) \
136 for (__i = TD_EVENTSIZE; __i > 0; --__i) \
137 (setp)->event_bits[__i - 1] = UINT32_C (0xffffffff); \
140 #define td_event_addset(setp, n) \
141 (((setp)->event_bits[__td_eventword (n)]) |= __td_eventmask (n))
142 #define td_event_delset(setp, n) \
143 (((setp)->event_bits[__td_eventword (n)]) &= ~__td_eventmask (n))
144 #define td_eventismember(setp, n) \
145 (__td_eventmask (n) & ((setp)->event_bits[__td_eventword (n)]))
146 #if TD_EVENTSIZE == 2
147 # define td_eventisempty(setp) \
148 (!((setp)->event_bits[0]) && !((setp)->event_bits[1]))
150 # error "td_eventisempty must be changed to match TD_EVENTSIZE"
153 /* Events reportable by the thread implementation. */
156 TD_ALL_EVENTS, /* Pseudo-event number. */
157 TD_EVENT_NONE = TD_ALL_EVENTS, /* Depends on context. */
158 TD_READY, /* Is executable now. */
159 TD_SLEEP, /* Blocked in a synchronization obj. */
160 TD_SWITCHTO, /* Now assigned to a process. */
161 TD_SWITCHFROM, /* Not anymore assigned to a process. */
162 TD_LOCK_TRY, /* Trying to get an unavailable lock. */
163 TD_CATCHSIG, /* Signal posted to the thread. */
164 TD_IDLE, /* Process getting idle. */
165 TD_CREATE, /* New thread created. */
166 TD_DEATH, /* Thread terminated. */
167 TD_PREEMPT, /* Preempted. */
168 TD_PRI_INHERIT, /* Inherited elevated priority. */
169 TD_REAP, /* Reaped. */
170 TD_CONCURRENCY, /* Number of processes changing. */
171 TD_TIMEOUT, /* Conditional variable wait timed out. */
172 TD_MIN_EVENT_NUM = TD_READY,
173 TD_MAX_EVENT_NUM = TD_TIMEOUT,
174 TD_EVENTS_ENABLE = 31 /* Event reporting enabled. */
177 /* Values representing the different ways events are reported. */
180 NOTIFY_BPT, /* User must insert breakpoint at u.bptaddr. */
181 NOTIFY_AUTOBPT, /* Breakpoint at u.bptaddr is automatically
183 NOTIFY_SYSCALL /* System call u.syscallno will be invoked. */
186 /* Description how event type is reported. */
187 typedef struct td_notify
189 td_notify_e type; /* Way the event is reported. */
192 psaddr_t bptaddr; /* Address of breakpoint. */
193 int syscallno; /* Number of system call used. */
197 /* Structure used to report event. */
198 typedef struct td_event_msg
200 td_event_e event; /* Event type being reported. */
201 const td_thrhandle_t *th_p; /* Thread reporting the event. */
205 td_synchandle_t *sh; /* Handle of synchronization object. */
207 uintptr_t data; /* Event specific data. */
211 /* Structure containing event data available in each thread structure. */
214 td_thr_events_t eventmask; /* Mask of enabled events. */
215 td_event_e eventnum; /* Number of last event. */
216 void *eventdata; /* Data associated with event. */
220 /* Gathered statistics about the process. */
221 typedef struct td_ta_stats
223 int nthreads; /* Total number of threads in use. */
224 int r_concurrency; /* Concurrency level requested by user. */
225 int nrunnable_num; /* Average runnable threads, numerator. */
226 int nrunnable_den; /* Average runnable threads, denominator. */
227 int a_concurrency_num; /* Achieved concurrency level, numerator. */
228 int a_concurrency_den; /* Achieved concurrency level, denominator. */
229 int nlwps_num; /* Average number of processes in use,
231 int nlwps_den; /* Average number of processes in use,
233 int nidle_num; /* Average number of idling processes,
235 int nidle_den; /* Average number of idling processes,
240 /* Since Sun's library is based on Solaris threads we have to define a few
241 types to map them to POSIX threads. */
242 typedef pthread_t thread_t;
243 typedef pthread_key_t thread_key_t;
246 /* Callback for iteration over threads. */
247 typedef int td_thr_iter_f (const td_thrhandle_t *, void *);
249 /* Callback for iteration over thread local data. */
250 typedef int td_key_iter_f (thread_key_t, void (*) (void *), void *);
254 /* Forward declaration. This has to be defined by the user. */
255 struct ps_prochandle;
258 /* Information about the thread. */
259 typedef struct td_thrinfo
261 td_thragent_t *ti_ta_p; /* Process handle. */
262 unsigned int ti_user_flags; /* Unused. */
263 thread_t ti_tid; /* Thread ID returned by
265 char *ti_tls; /* Pointer to thread-local data. */
266 psaddr_t ti_startfunc; /* Start function passed to
268 psaddr_t ti_stkbase; /* Base of thread's stack. */
269 long int ti_stksize; /* Size of thread's stack. */
270 psaddr_t ti_ro_area; /* Unused. */
271 int ti_ro_size; /* Unused. */
272 td_thr_state_e ti_state; /* Thread state. */
273 unsigned char ti_db_suspended; /* Nonzero if suspended by debugger. */
274 td_thr_type_e ti_type; /* Type of the thread (system vs
276 intptr_t ti_pc; /* Unused. */
277 intptr_t ti_sp; /* Unused. */
278 short int ti_flags; /* Unused. */
279 int ti_pri; /* Thread priority. */
280 lwpid_t ti_lid; /* Kernel PID for this thread. */
281 sigset_t ti_sigmask; /* Signal mask. */
282 unsigned char ti_traceme; /* Nonzero if event reporting
284 unsigned char ti_preemptflag; /* Unused. */
285 unsigned char ti_pirecflag; /* Unused. */
286 sigset_t ti_pending; /* Set of pending signals. */
287 td_thr_events_t ti_events; /* Set of enabled events. */
292 /* Prototypes for exported library functions. */
294 /* Initialize the thread debug support library. */
295 extern td_err_e td_init (void);
297 /* Historical relict. Should not be used anymore. */
298 extern td_err_e td_log (void);
300 /* Return list of symbols the library can request. */
301 extern const char **td_symbol_list (void);
303 /* Generate new thread debug library handle for process PS. */
304 extern td_err_e td_ta_new (struct ps_prochandle *__ps, td_thragent_t **__ta);
306 /* Free resources allocated for TA. */
307 extern td_err_e td_ta_delete (td_thragent_t *__ta);
309 /* Get number of currently running threads in process associated with TA. */
310 extern td_err_e td_ta_get_nthreads (const td_thragent_t *__ta, int *__np);
312 /* Return process handle passed in `td_ta_new' for process associated with
314 extern td_err_e td_ta_get_ph (const td_thragent_t *__ta,
315 struct ps_prochandle **__ph);
317 /* Map thread library handle PT to thread debug library handle for process
318 associated with TA and store result in *TH. */
319 extern td_err_e td_ta_map_id2thr (const td_thragent_t *__ta, pthread_t __pt,
320 td_thrhandle_t *__th);
322 /* Map process ID LWPID to thread debug library handle for process
323 associated with TA and store result in *TH. */
324 extern td_err_e td_ta_map_lwp2thr (const td_thragent_t *__ta, lwpid_t __lwpid,
325 td_thrhandle_t *__th);
328 /* Call for each thread in a process associated with TA the callback function
330 extern td_err_e td_ta_thr_iter (const td_thragent_t *__ta,
331 td_thr_iter_f *__callback, void *__cbdata_p,
332 td_thr_state_e __state, int __ti_pri,
333 sigset_t *__ti_sigmask_p,
334 unsigned int __ti_user_flags);
336 /* Call for each defined thread local data entry the callback function KI. */
337 extern td_err_e td_ta_tsd_iter (const td_thragent_t *__ta, td_key_iter_f *__ki,
341 /* Get event address for EVENT. */
342 extern td_err_e td_ta_event_addr (const td_thragent_t *__ta,
343 td_event_e __event, td_notify_t *__ptr);
345 /* Enable EVENT in global mask. */
346 extern td_err_e td_ta_set_event (const td_thragent_t *__ta,
347 td_thr_events_t *__event);
349 /* Disable EVENT in global mask. */
350 extern td_err_e td_ta_clear_event (const td_thragent_t *__ta,
351 td_thr_events_t *__event);
353 /* Return information about last event. */
354 extern td_err_e td_ta_event_getmsg (const td_thragent_t *__ta,
355 td_event_msg_t *__msg);
358 /* Set suggested concurrency level for process associated with TA. */
359 extern td_err_e td_ta_setconcurrency (const td_thragent_t *__ta, int __level);
362 /* Enable collecting statistics for process associated with TA. */
363 extern td_err_e td_ta_enable_stats (const td_thragent_t *__ta, int __enable);
365 /* Reset statistics. */
366 extern td_err_e td_ta_reset_stats (const td_thragent_t *__ta);
368 /* Retrieve statistics from process associated with TA. */
369 extern td_err_e td_ta_get_stats (const td_thragent_t *__ta,
370 td_ta_stats_t *__statsp);
373 /* Validate that TH is a thread handle. */
374 extern td_err_e td_thr_validate (const td_thrhandle_t *__th);
376 /* Return information about thread TH. */
377 extern td_err_e td_thr_get_info (const td_thrhandle_t *__th,
378 td_thrinfo_t *__infop);
380 /* Retrieve floating-point register contents of process running thread TH. */
381 extern td_err_e td_thr_getfpregs (const td_thrhandle_t *__th,
382 prfpregset_t *__regset);
384 /* Retrieve general register contents of process running thread TH. */
385 extern td_err_e td_thr_getgregs (const td_thrhandle_t *__th,
386 prgregset_t __gregs);
388 /* Retrieve extended register contents of process running thread TH. */
389 extern td_err_e td_thr_getxregs (const td_thrhandle_t *__th, void *__xregs);
391 /* Get size of extended register set of process running thread TH. */
392 extern td_err_e td_thr_getxregsize (const td_thrhandle_t *__th, int *__sizep);
394 /* Set floating-point register contents of process running thread TH. */
395 extern td_err_e td_thr_setfpregs (const td_thrhandle_t *__th,
396 const prfpregset_t *__fpregs);
398 /* Set general register contents of process running thread TH. */
399 extern td_err_e td_thr_setgregs (const td_thrhandle_t *__th,
400 prgregset_t __gregs);
402 /* Set extended register contents of process running thread TH. */
403 extern td_err_e td_thr_setxregs (const td_thrhandle_t *__th,
407 /* Get address of the given module's TLS storage area for the given thread. */
408 extern td_err_e td_thr_tlsbase (const td_thrhandle_t *__th,
409 unsigned long int __modid,
412 /* Get address of thread local variable. */
413 extern td_err_e td_thr_tls_get_addr (const td_thrhandle_t *__th,
414 psaddr_t __map_address, size_t __offset,
415 psaddr_t *__address);
418 /* Enable reporting for EVENT for thread TH. */
419 extern td_err_e td_thr_event_enable (const td_thrhandle_t *__th, int __event);
421 /* Enable EVENT for thread TH. */
422 extern td_err_e td_thr_set_event (const td_thrhandle_t *__th,
423 td_thr_events_t *__event);
425 /* Disable EVENT for thread TH. */
426 extern td_err_e td_thr_clear_event (const td_thrhandle_t *__th,
427 td_thr_events_t *__event);
429 /* Get event message for thread TH. */
430 extern td_err_e td_thr_event_getmsg (const td_thrhandle_t *__th,
431 td_event_msg_t *__msg);
434 /* Set priority of thread TH. */
435 extern td_err_e td_thr_setprio (const td_thrhandle_t *__th, int __prio);
438 /* Set pending signals for thread TH. */
439 extern td_err_e td_thr_setsigpending (const td_thrhandle_t *__th,
440 unsigned char __n, const sigset_t *__ss);
442 /* Set signal mask for thread TH. */
443 extern td_err_e td_thr_sigsetmask (const td_thrhandle_t *__th,
444 const sigset_t *__ss);
447 /* Return thread local data associated with key TK in thread TH. */
448 extern td_err_e td_thr_tsd (const td_thrhandle_t *__th,
449 const thread_key_t __tk, void **__data);
452 /* Suspend execution of thread TH. */
453 extern td_err_e td_thr_dbsuspend (const td_thrhandle_t *__th);
455 /* Resume execution of thread TH. */
456 extern td_err_e td_thr_dbresume (const td_thrhandle_t *__th);
458 #endif /* thread_db.h */