libpthread/nptl_db/thread_db.h

   1 /* thread_db.h -- interface to libthread_db.so library for debugging -lpthread
   2    Copyright (C) 1999,2001,2002,2003 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   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.
   9
  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.
  14
  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/>.  */
  18
  19 #ifndef _THREAD_DB_H
  20 #define _THREAD_DB_H    1
  21
  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.  */
  25 #include <pthread.h>
  26 #include <stdint.h>
  27 #include <sys/types.h>
  28 #include <sys/procfs.h>
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34 /* Error codes of the library.  */
  35 typedef enum
  36 {
  37   TD_OK,          /* No error.  */
  38   TD_ERR,         /* No further specified error.  */
  39   TD_NOTHR,       /* No matching thread found.  */
  40   TD_NOSV,        /* No matching synchronization handle found.  */
  41   TD_NOLWP,       /* No matching light-weighted process found.  */
  42   TD_BADPH,       /* Invalid process handle.  */
  43   TD_BADTH,       /* Invalid thread handle.  */
  44   TD_BADSH,       /* Invalid synchronization handle.  */
  45   TD_BADTA,       /* Invalid thread agent.  */
  46   TD_BADKEY,      /* Invalid key.  */
  47   TD_NOMSG,       /* No event available.  */
  48   TD_NOFPREGS,    /* No floating-point register content available.  */
  49   TD_NOLIBTHREAD, /* Application not linked with thread library.  */
  50   TD_NOEVENT,     /* Requested event is not supported.  */
  51   TD_NOCAPAB,     /* Capability not available.  */
  52   TD_DBERR,       /* Internal debug library error.  */
  53   TD_NOAPLIC,     /* Operation is not applicable.  */
  54   TD_NOTSD,       /* No thread-specific data available.  */
  55   TD_MALLOC,      /* Out of memory.  */
  56   TD_PARTIALREG,  /* Not entire register set was read or written.  */
  57   TD_NOXREGS,     /* X register set not available for given thread.  */
  58   TD_TLSDEFER,    /* Thread has not yet allocated TLS for given module.  */
  59   TD_NOTALLOC = TD_TLSDEFER,
  60   TD_VERSION,     /* Version if libpthread and libthread_db do not match.  */
  61   TD_NOTLS        /* There is no TLS segment in the given module.  */
  62 } td_err_e;
  63
  64
  65 /* Possible thread states.  TD_THR_ANY_STATE is a pseudo-state used to
  66    select threads regardless of state in td_ta_thr_iter().  */
  67 typedef enum
  68 {
  69   TD_THR_ANY_STATE,
  70   TD_THR_UNKNOWN,
  71   TD_THR_STOPPED,
  72   TD_THR_RUN,
  73   TD_THR_ACTIVE,
  74   TD_THR_ZOMBIE,
  75   TD_THR_SLEEP,
  76   TD_THR_STOPPED_ASLEEP
  77 } td_thr_state_e;
  78
  79 /* Thread type: user or system.  TD_THR_ANY_TYPE is a pseudo-type used
  80    to select threads regardless of type in td_ta_thr_iter().  */
  81 typedef enum
  82 {
  83   TD_THR_ANY_TYPE,
  84   TD_THR_USER,
  85   TD_THR_SYSTEM
  86 } td_thr_type_e;
  87
  88
  89 /* Types of the debugging library.  */
  90
  91 /* Handle for a process.  This type is opaque.  */
  92 typedef struct td_thragent td_thragent_t;
  93
  94 /* The actual thread handle type.  This is also opaque.  */
  95 typedef struct td_thrhandle
  96 {
  97   td_thragent_t *th_ta_p;
  98   psaddr_t th_unique;
  99 } td_thrhandle_t;
 100
 101
 102 /* Forward declaration of a type defined by and for the dynamic linker.  */
 103 struct link_map;
 104
 105
 106 /* Flags for `td_ta_thr_iter'.  */
 107 #define TD_THR_ANY_USER_FLAGS   0xffffffff
 108 #define TD_THR_LOWEST_PRIORITY  -20
 109 #define TD_SIGNO_MASK           NULL
 110
 111
 112 #define TD_EVENTSIZE    2
 113 #define BT_UISHIFT      5 /* log base 2 of BT_NBIPUI, to extract word index */
 114 #define BT_NBIPUI       (1 << BT_UISHIFT)       /* n bits per uint */
 115 #define BT_UIMASK       (BT_NBIPUI - 1)         /* to extract bit index */
 116
 117 /* Bitmask of enabled events. */
 118 typedef struct td_thr_events
 119 {
 120   uint32_t event_bits[TD_EVENTSIZE];
 121 } td_thr_events_t;
 122
 123 /* Event set manipulation macros. */
 124 #define __td_eventmask(n) \
 125   (UINT32_C (1) << (((n) - 1) & BT_UIMASK))
 126 #define __td_eventword(n) \
 127   ((UINT32_C ((n) - 1)) >> BT_UISHIFT)
 128
 129 #define td_event_emptyset(setp) \
 130   do {                                                                        \
 131     int __i;                                                                  \
 132     for (__i = TD_EVENTSIZE; __i > 0; --__i)                                  \
 133       (setp)->event_bits[__i - 1] = 0;                                        \
 134   } while (0)
 135
 136 #define td_event_fillset(setp) \
 137   do {                                                                        \
 138     int __i;                                                                  \
 139     for (__i = TD_EVENTSIZE; __i > 0; --__i)                                  \
 140       (setp)->event_bits[__i - 1] = UINT32_C (0xffffffff);                    \
 141   } while (0)
 142
 143 #define td_event_addset(setp, n) \
 144   (((setp)->event_bits[__td_eventword (n)]) |= __td_eventmask (n))
 145 #define td_event_delset(setp, n) \
 146   (((setp)->event_bits[__td_eventword (n)]) &= ~__td_eventmask (n))
 147 #define td_eventismember(setp, n) \
 148   (__td_eventmask (n) & ((setp)->event_bits[__td_eventword (n)]))
 149 #if TD_EVENTSIZE == 2
 150 # define td_eventisempty(setp) \
 151   (!((setp)->event_bits[0]) && !((setp)->event_bits[1]))
 152 #else
 153 # error "td_eventisempty must be changed to match TD_EVENTSIZE"
 154 #endif
 155
 156 /* Events reportable by the thread implementation.  */
 157 typedef enum
 158 {
 159   TD_ALL_EVENTS,                 /* Pseudo-event number.  */
 160   TD_EVENT_NONE = TD_ALL_EVENTS, /* Depends on context.  */
 161   TD_READY,                      /* Is executable now. */
 162   TD_SLEEP,                      /* Blocked in a synchronization obj.  */
 163   TD_SWITCHTO,                   /* Now assigned to a process.  */
 164   TD_SWITCHFROM,                 /* Not anymore assigned to a process.  */
 165   TD_LOCK_TRY,                   /* Trying to get an unavailable lock.  */
 166   TD_CATCHSIG,                   /* Signal posted to the thread.  */
 167   TD_IDLE,                       /* Process getting idle.  */
 168   TD_CREATE,                     /* New thread created.  */
 169   TD_DEATH,                      /* Thread terminated.  */
 170   TD_PREEMPT,                    /* Preempted.  */
 171   TD_PRI_INHERIT,                /* Inherited elevated priority.  */
 172   TD_REAP,                       /* Reaped.  */
 173   TD_CONCURRENCY,                /* Number of processes changing.  */
 174   TD_TIMEOUT,                    /* Conditional variable wait timed out.  */
 175   TD_MIN_EVENT_NUM = TD_READY,
 176   TD_MAX_EVENT_NUM = TD_TIMEOUT,
 177   TD_EVENTS_ENABLE = 31         /* Event reporting enabled.  */
 178 } td_event_e;
 179
 180 /* Values representing the different ways events are reported.  */
 181 typedef enum
 182 {
 183   NOTIFY_BPT,                   /* User must insert breakpoint at u.bptaddr. */
 184   NOTIFY_AUTOBPT,               /* Breakpoint at u.bptaddr is automatically
 185                                    inserted.  */
 186   NOTIFY_SYSCALL                /* System call u.syscallno will be invoked.  */
 187 } td_notify_e;
 188
 189 /* Description how event type is reported.  */
 190 typedef struct td_notify
 191 {
 192   td_notify_e type;             /* Way the event is reported.  */
 193   union
 194   {
 195     psaddr_t bptaddr;           /* Address of breakpoint.  */
 196     int syscallno;              /* Number of system call used.  */
 197   } u;
 198 } td_notify_t;
 199
 200 /* Structure used to report event.  */
 201 typedef struct td_event_msg
 202 {
 203   td_event_e event;             /* Event type being reported.  */
 204   const td_thrhandle_t *th_p;   /* Thread reporting the event.  */
 205   union
 206   {
 207 # if 0
 208     td_synchandle_t *sh;        /* Handle of synchronization object.  */
 209 #endif
 210     uintptr_t data;             /* Event specific data.  */
 211   } msg;
 212 } td_event_msg_t;
 213
 214 /* Structure containing event data available in each thread structure.  */
 215 typedef struct
 216 {
 217   td_thr_events_t eventmask;    /* Mask of enabled events.  */
 218   td_event_e eventnum;          /* Number of last event.  */
 219   void *eventdata;              /* Data associated with event.  */
 220 } td_eventbuf_t;
 221
 222
 223 /* Gathered statistics about the process.  */
 224 typedef struct td_ta_stats
 225 {
 226   int nthreads;                 /* Total number of threads in use.  */
 227   int r_concurrency;            /* Concurrency level requested by user.  */
 228   int nrunnable_num;            /* Average runnable threads, numerator.  */
 229   int nrunnable_den;            /* Average runnable threads, denominator.  */
 230   int a_concurrency_num;        /* Achieved concurrency level, numerator.  */
 231   int a_concurrency_den;        /* Achieved concurrency level, denominator.  */
 232   int nlwps_num;                /* Average number of processes in use,
 233                                    numerator.  */
 234   int nlwps_den;                /* Average number of processes in use,
 235                                    denominator.  */
 236   int nidle_num;                /* Average number of idling processes,
 237                                    numerator.  */
 238   int nidle_den;                /* Average number of idling processes,
 239                                    denominator.  */
 240 } td_ta_stats_t;
 241
 242
 243 /* Since Sun's library is based on Solaris threads we have to define a few
 244    types to map them to POSIX threads.  */
 245 typedef pthread_t thread_t;
 246 typedef pthread_key_t thread_key_t;
 247
 248
 249 /* Callback for iteration over threads.  */
 250 typedef int td_thr_iter_f (const td_thrhandle_t *, void *);
 251
 252 /* Callback for iteration over thread local data.  */
 253 typedef int td_key_iter_f (thread_key_t, void (*) (void *), void *);
 254
 255
 256
 257 /* Forward declaration.  This has to be defined by the user.  */
 258 struct ps_prochandle;
 259
 260
 261 /* Information about the thread.  */
 262 typedef struct td_thrinfo
 263 {
 264   td_thragent_t *ti_ta_p;               /* Process handle.  */
 265   unsigned int ti_user_flags;           /* Unused.  */
 266   thread_t ti_tid;                      /* Thread ID returned by
 267                                            pthread_create().  */
 268   char *ti_tls;                         /* Pointer to thread-local data.  */
 269   psaddr_t ti_startfunc;                /* Start function passed to
 270                                            pthread_create().  */
 271   psaddr_t ti_stkbase;                  /* Base of thread's stack.  */
 272   long int ti_stksize;                  /* Size of thread's stack.  */
 273   psaddr_t ti_ro_area;                  /* Unused.  */
 274   int ti_ro_size;                       /* Unused.  */
 275   td_thr_state_e ti_state;              /* Thread state.  */
 276   unsigned char ti_db_suspended;        /* Nonzero if suspended by debugger. */
 277   td_thr_type_e ti_type;                /* Type of the thread (system vs
 278                                            user thread).  */
 279   intptr_t ti_pc;                       /* Unused.  */
 280   intptr_t ti_sp;                       /* Unused.  */
 281   short int ti_flags;                   /* Unused.  */
 282   int ti_pri;                           /* Thread priority.  */
 283   lwpid_t ti_lid;                       /* Kernel PID for this thread.  */
 284   sigset_t ti_sigmask;                  /* Signal mask.  */
 285   unsigned char ti_traceme;             /* Nonzero if event reporting
 286                                            enabled.  */
 287   unsigned char ti_preemptflag;         /* Unused.  */
 288   unsigned char ti_pirecflag;           /* Unused.  */
 289   sigset_t ti_pending;                  /* Set of pending signals.  */
 290   td_thr_events_t ti_events;            /* Set of enabled events.  */
 291 } td_thrinfo_t;
 292
 293
 294
 295 /* Prototypes for exported library functions.  */
 296
 297 /* Initialize the thread debug support library.  */
 298 extern td_err_e td_init (void);
 299
 300 /* Historical relict.  Should not be used anymore.  */
 301 extern td_err_e td_log (void);
 302
 303 /* Return list of symbols the library can request.  */
 304 extern const char **td_symbol_list (void);
 305
 306 /* Generate new thread debug library handle for process PS.  */
 307 extern td_err_e td_ta_new (struct ps_prochandle *__ps, td_thragent_t **__ta);
 308
 309 /* Free resources allocated for TA.  */
 310 extern td_err_e td_ta_delete (td_thragent_t *__ta);
 311
 312 /* Get number of currently running threads in process associated with TA.  */
 313 extern td_err_e td_ta_get_nthreads (const td_thragent_t *__ta, int *__np);
 314
 315 /* Return process handle passed in `td_ta_new' for process associated with
 316    TA.  */
 317 extern td_err_e td_ta_get_ph (const td_thragent_t *__ta,
 318                               struct ps_prochandle **__ph);
 319
 320 /* Map thread library handle PT to thread debug library handle for process
 321    associated with TA and store result in *TH.  */
 322 extern td_err_e td_ta_map_id2thr (const td_thragent_t *__ta, pthread_t __pt,
 323                                   td_thrhandle_t *__th);
 324
 325 /* Map process ID LWPID to thread debug library handle for process
 326    associated with TA and store result in *TH.  */
 327 extern td_err_e td_ta_map_lwp2thr (const td_thragent_t *__ta, lwpid_t __lwpid,
 328                                    td_thrhandle_t *__th);
 329
 330
 331 /* Call for each thread in a process associated with TA the callback function
 332    CALLBACK.  */
 333 extern td_err_e td_ta_thr_iter (const td_thragent_t *__ta,
 334                                 td_thr_iter_f *__callback, void *__cbdata_p,
 335                                 td_thr_state_e __state, int __ti_pri,
 336                                 sigset_t *__ti_sigmask_p,
 337                                 unsigned int __ti_user_flags);
 338
 339 /* Call for each defined thread local data entry the callback function KI.  */
 340 extern td_err_e td_ta_tsd_iter (const td_thragent_t *__ta, td_key_iter_f *__ki,
 341                                 void *__p);
 342
 343
 344 /* Get event address for EVENT.  */
 345 extern td_err_e td_ta_event_addr (const td_thragent_t *__ta,
 346                                   td_event_e __event, td_notify_t *__ptr);
 347
 348 /* Enable EVENT in global mask.  */
 349 extern td_err_e td_ta_set_event (const td_thragent_t *__ta,
 350                                  td_thr_events_t *__event);
 351
 352 /* Disable EVENT in global mask.  */
 353 extern td_err_e td_ta_clear_event (const td_thragent_t *__ta,
 354                                    td_thr_events_t *__event);
 355
 356 /* Return information about last event.  */
 357 extern td_err_e td_ta_event_getmsg (const td_thragent_t *__ta,
 358                                     td_event_msg_t *__msg);
 359
 360 #ifdef __UCLIBC_SUSV4_LEGACY__
 361 /* Set suggested concurrency level for process associated with TA.  */
 362 extern td_err_e td_ta_setconcurrency (const td_thragent_t *__ta, int __level);
 363 #endif
 364
 365 /* Enable collecting statistics for process associated with TA.  */
 366 extern td_err_e td_ta_enable_stats (const td_thragent_t *__ta, int __enable);
 367
 368 /* Reset statistics.  */
 369 extern td_err_e td_ta_reset_stats (const td_thragent_t *__ta);
 370
 371 /* Retrieve statistics from process associated with TA.  */
 372 extern td_err_e td_ta_get_stats (const td_thragent_t *__ta,
 373                                  td_ta_stats_t *__statsp);
 374
 375
 376 /* Validate that TH is a thread handle.  */
 377 extern td_err_e td_thr_validate (const td_thrhandle_t *__th);
 378
 379 /* Return information about thread TH.  */
 380 extern td_err_e td_thr_get_info (const td_thrhandle_t *__th,
 381                                  td_thrinfo_t *__infop);
 382
 383 /* Retrieve floating-point register contents of process running thread TH.  */
 384 extern td_err_e td_thr_getfpregs (const td_thrhandle_t *__th,
 385                                   prfpregset_t *__regset);
 386
 387 /* Retrieve general register contents of process running thread TH.  */
 388 extern td_err_e td_thr_getgregs (const td_thrhandle_t *__th,
 389                                  prgregset_t __gregs);
 390
 391 /* Retrieve extended register contents of process running thread TH.  */
 392 extern td_err_e td_thr_getxregs (const td_thrhandle_t *__th, void *__xregs);
 393
 394 /* Get size of extended register set of process running thread TH.  */
 395 extern td_err_e td_thr_getxregsize (const td_thrhandle_t *__th, int *__sizep);
 396
 397 /* Set floating-point register contents of process running thread TH.  */
 398 extern td_err_e td_thr_setfpregs (const td_thrhandle_t *__th,
 399                                   const prfpregset_t *__fpregs);
 400
 401 /* Set general register contents of process running thread TH.  */
 402 extern td_err_e td_thr_setgregs (const td_thrhandle_t *__th,
 403                                  prgregset_t __gregs);
 404
 405 /* Set extended register contents of process running thread TH.  */
 406 extern td_err_e td_thr_setxregs (const td_thrhandle_t *__th,
 407                                  const void *__addr);
 408
 409
 410 /* Get address of the given module's TLS storage area for the given thread.  */
 411 extern td_err_e td_thr_tlsbase (const td_thrhandle_t *__th,
 412                                 unsigned long int __modid,
 413                                 psaddr_t *__base);
 414
 415 /* Get address of thread local variable.  */
 416 extern td_err_e td_thr_tls_get_addr (const td_thrhandle_t *__th,
 417                                      psaddr_t __map_address, size_t __offset,
 418                                      psaddr_t *__address);
 419
 420
 421 /* Enable reporting for EVENT for thread TH.  */
 422 extern td_err_e td_thr_event_enable (const td_thrhandle_t *__th, int __event);
 423
 424 /* Enable EVENT for thread TH.  */
 425 extern td_err_e td_thr_set_event (const td_thrhandle_t *__th,
 426                                   td_thr_events_t *__event);
 427
 428 /* Disable EVENT for thread TH.  */
 429 extern td_err_e td_thr_clear_event (const td_thrhandle_t *__th,
 430                                     td_thr_events_t *__event);
 431
 432 /* Get event message for thread TH.  */
 433 extern td_err_e td_thr_event_getmsg (const td_thrhandle_t *__th,
 434                                      td_event_msg_t *__msg);
 435
 436
 437 /* Set priority of thread TH.  */
 438 extern td_err_e td_thr_setprio (const td_thrhandle_t *__th, int __prio);
 439
 440
 441 /* Set pending signals for thread TH.  */
 442 extern td_err_e td_thr_setsigpending (const td_thrhandle_t *__th,
 443                                       unsigned char __n, const sigset_t *__ss);
 444
 445 /* Set signal mask for thread TH.  */
 446 extern td_err_e td_thr_sigsetmask (const td_thrhandle_t *__th,
 447                                    const sigset_t *__ss);
 448
 449
 450 /* Return thread local data associated with key TK in thread TH.  */
 451 extern td_err_e td_thr_tsd (const td_thrhandle_t *__th,
 452                             const thread_key_t __tk, void **__data);
 453
 454
 455 /* Suspend execution of thread TH.  */
 456 extern td_err_e td_thr_dbsuspend (const td_thrhandle_t *__th);
 457
 458 /* Resume execution of thread TH.  */
 459 extern td_err_e td_thr_dbresume (const td_thrhandle_t *__th);
 460
 461 #ifdef __cplusplus
 462 }
 463 #endif
 464
 465 #endif  /* thread_db.h */