/* thread_db.h -- interface to libthread_db.so library for debugging -lpthread

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Copyright (C) 1999-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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#ifndef _THREAD_DB_H

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#define _THREAD_DB_H 1

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/* This is the debugger interface for the NPTL library. It is

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modelled closely after the interface with same names in Solaris

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with the goal to share the same code in the debugger. */

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#include <pthread.h>

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#include <stdint.h>

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#include <sys/types.h>

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#include <sys/procfs.h>

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/* Error codes of the library. */

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typedef enum

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{

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TD_OK, /* No error. */

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TD_ERR, /* No further specified error. */

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TD_NOTHR, /* No matching thread found. */

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TD_NOSV, /* No matching synchronization handle found. */

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TD_NOLWP, /* No matching light-weighted process found. */

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TD_BADPH, /* Invalid process handle. */

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TD_BADTH, /* Invalid thread handle. */

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TD_BADSH, /* Invalid synchronization handle. */

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TD_BADTA, /* Invalid thread agent. */

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TD_BADKEY, /* Invalid key. */

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TD_NOMSG, /* No event available. */

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TD_NOFPREGS, /* No floating-point register content available. */

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TD_NOLIBTHREAD, /* Application not linked with thread library. */

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TD_NOEVENT, /* Requested event is not supported. */

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TD_NOCAPAB, /* Capability not available. */

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TD_DBERR, /* Internal debug library error. */

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TD_NOAPLIC, /* Operation is not applicable. */

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TD_NOTSD, /* No thread-specific data available. */

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TD_MALLOC, /* Out of memory. */

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TD_PARTIALREG, /* Not entire register set was read or written. */

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TD_NOXREGS, /* X register set not available for given thread. */

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TD_TLSDEFER, /* Thread has not yet allocated TLS for given module. */

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TD_NOTALLOC = TD_TLSDEFER,

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TD_VERSION, /* Version if libpthread and libthread_db do not match. */

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TD_NOTLS /* There is no TLS segment in the given module. */

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} td_err_e;

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/* Possible thread states. TD_THR_ANY_STATE is a pseudo-state used to

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select threads regardless of state in td_ta_thr_iter(). */

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typedef enum

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{

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TD_THR_ANY_STATE,

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TD_THR_UNKNOWN,

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TD_THR_STOPPED,

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TD_THR_RUN,

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TD_THR_ACTIVE,

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TD_THR_ZOMBIE,

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TD_THR_SLEEP,

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TD_THR_STOPPED_ASLEEP

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} td_thr_state_e;

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/* Thread type: user or system. TD_THR_ANY_TYPE is a pseudo-type used

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to select threads regardless of type in td_ta_thr_iter(). */

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typedef enum

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{

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TD_THR_ANY_TYPE,

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TD_THR_USER,

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TD_THR_SYSTEM

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} td_thr_type_e;

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/* Types of the debugging library. */

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/* Handle for a process. This type is opaque. */

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typedef struct td_thragent td_thragent_t;

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/* The actual thread handle type. This is also opaque. */

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typedef struct td_thrhandle

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{

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td_thragent_t *th_ta_p;

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psaddr_t th_unique;

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} td_thrhandle_t;

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/* Forward declaration of a type defined by and for the dynamic linker. */

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struct link_map;

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/* Flags for `td_ta_thr_iter'. */

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#define TD_THR_ANY_USER_FLAGS 0xffffffff

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#define TD_THR_LOWEST_PRIORITY -20

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#define TD_SIGNO_MASK NULL

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#define TD_EVENTSIZE 2

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#define BT_UISHIFT 5 /* log base 2 of BT_NBIPUI, to extract word index */

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#define BT_NBIPUI (1 << BT_UISHIFT) /* n bits per unsigned int */

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#define BT_UIMASK (BT_NBIPUI - 1) /* to extract bit index */

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/* Bitmask of enabled events. */

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typedef struct td_thr_events

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{

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uint32_t event_bits[TD_EVENTSIZE];

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} td_thr_events_t;

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/* Event set manipulation macros. */

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#define __td_eventmask(n) \

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(UINT32_C (1) << (((n) - 1) & BT_UIMASK))

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#define __td_eventword(n) \

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((UINT32_C ((n) - 1)) >> BT_UISHIFT)

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#define td_event_emptyset(setp) \

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do { \

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int __i; \

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for (__i = TD_EVENTSIZE; __i > 0; --__i) \

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(setp)->event_bits[__i - 1] = 0; \

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} while (0)

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#define td_event_fillset(setp) \

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do { \

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int __i; \

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for (__i = TD_EVENTSIZE; __i > 0; --__i) \

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(setp)->event_bits[__i - 1] = UINT32_C (0xffffffff); \

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} while (0)

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#define td_event_addset(setp, n) \

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(((setp)->event_bits[__td_eventword (n)]) |= __td_eventmask (n))

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#define td_event_delset(setp, n) \

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(((setp)->event_bits[__td_eventword (n)]) &= ~__td_eventmask (n))

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#define td_eventismember(setp, n) \

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(__td_eventmask (n) & ((setp)->event_bits[__td_eventword (n)]))

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#if TD_EVENTSIZE == 2

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# define td_eventisempty(setp) \

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(!((setp)->event_bits[0]) && !((setp)->event_bits[1]))

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#else

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# error "td_eventisempty must be changed to match TD_EVENTSIZE"

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#endif

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/* Events reportable by the thread implementation. */

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typedef enum

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{

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TD_ALL_EVENTS, /* Pseudo-event number. */

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TD_EVENT_NONE = TD_ALL_EVENTS, /* Depends on context. */

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TD_READY, /* Is executable now. */

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TD_SLEEP, /* Blocked in a synchronization obj. */

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TD_SWITCHTO, /* Now assigned to a process. */

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TD_SWITCHFROM, /* Not anymore assigned to a process. */

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TD_LOCK_TRY, /* Trying to get an unavailable lock. */

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TD_CATCHSIG, /* Signal posted to the thread. */

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TD_IDLE, /* Process getting idle. */

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TD_CREATE, /* New thread created. */

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TD_DEATH, /* Thread terminated. */

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TD_PREEMPT, /* Preempted. */

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TD_PRI_INHERIT, /* Inherited elevated priority. */

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TD_REAP, /* Reaped. */

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TD_CONCURRENCY, /* Number of processes changing. */

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TD_TIMEOUT, /* Conditional variable wait timed out. */

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TD_MIN_EVENT_NUM = TD_READY,

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TD_MAX_EVENT_NUM = TD_TIMEOUT,

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TD_EVENTS_ENABLE = 31 /* Event reporting enabled. */

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} td_event_e;

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/* Values representing the different ways events are reported. */

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typedef enum

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{

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NOTIFY_BPT, /* User must insert breakpoint at u.bptaddr. */

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NOTIFY_AUTOBPT, /* Breakpoint at u.bptaddr is automatically

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inserted. */

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NOTIFY_SYSCALL /* System call u.syscallno will be invoked. */

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} td_notify_e;

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/* Description how event type is reported. */

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typedef struct td_notify

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{

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td_notify_e type; /* Way the event is reported. */

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union

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{

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psaddr_t bptaddr; /* Address of breakpoint. */

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int syscallno; /* Number of system call used. */

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} u;

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} td_notify_t;

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/* Structure used to report event. */

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typedef struct td_event_msg

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{

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td_event_e event; /* Event type being reported. */

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const td_thrhandle_t *th_p; /* Thread reporting the event. */

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union

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{

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# if 0

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td_synchandle_t *sh; /* Handle of synchronization object. */

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#endif

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uintptr_t data; /* Event specific data. */

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} msg;

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} td_event_msg_t;

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/* Structure containing event data available in each thread structure. */

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typedef struct

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{

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td_thr_events_t eventmask; /* Mask of enabled events. */

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td_event_e eventnum; /* Number of last event. */

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void *eventdata; /* Data associated with event. */

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} td_eventbuf_t;

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/* Gathered statistics about the process. */

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typedef struct td_ta_stats

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{

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int nthreads; /* Total number of threads in use. */

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int r_concurrency; /* Concurrency level requested by user. */

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int nrunnable_num; /* Average runnable threads, numerator. */

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int nrunnable_den; /* Average runnable threads, denominator. */

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int a_concurrency_num; /* Achieved concurrency level, numerator. */

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int a_concurrency_den; /* Achieved concurrency level, denominator. */

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int nlwps_num; /* Average number of processes in use,

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numerator. */

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int nlwps_den; /* Average number of processes in use,

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denominator. */

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int nidle_num; /* Average number of idling processes,

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numerator. */

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int nidle_den; /* Average number of idling processes,

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denominator. */

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} td_ta_stats_t;

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/* Since Sun's library is based on Solaris threads we have to define a few

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types to map them to POSIX threads. */

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typedef pthread_t thread_t;

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typedef pthread_key_t thread_key_t;

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/* Callback for iteration over threads. */

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typedef int td_thr_iter_f (const td_thrhandle_t *, void *);

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/* Callback for iteration over thread local data. */

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typedef int td_key_iter_f (thread_key_t, void (*) (void *), void *);

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/* Forward declaration. This has to be defined by the user. */

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struct ps_prochandle;

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/* Information about the thread. */

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typedef struct td_thrinfo

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{

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td_thragent_t *ti_ta_p; /* Process handle. */

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unsigned int ti_user_flags; /* Unused. */

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thread_t ti_tid; /* Thread ID returned by

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pthread_create(). */

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char *ti_tls; /* Pointer to thread-local data. */

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psaddr_t ti_startfunc; /* Start function passed to

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pthread_create(). */

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psaddr_t ti_stkbase; /* Base of thread's stack. */

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long int ti_stksize; /* Size of thread's stack. */

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psaddr_t ti_ro_area; /* Unused. */

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int ti_ro_size; /* Unused. */

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td_thr_state_e ti_state; /* Thread state. */

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unsigned char ti_db_suspended; /* Nonzero if suspended by debugger. */

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td_thr_type_e ti_type; /* Type of the thread (system vs

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user thread). */

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intptr_t ti_pc; /* Unused. */

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intptr_t ti_sp; /* Unused. */

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short int ti_flags; /* Unused. */

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int ti_pri; /* Thread priority. */

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lwpid_t ti_lid; /* Kernel PID for this thread. */

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sigset_t ti_sigmask; /* Signal mask. */

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unsigned char ti_traceme; /* Nonzero if event reporting

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enabled. */

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unsigned char ti_preemptflag; /* Unused. */

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unsigned char ti_pirecflag; /* Unused. */

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sigset_t ti_pending; /* Set of pending signals. */

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td_thr_events_t ti_events; /* Set of enabled events. */

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} td_thrinfo_t;

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/* Prototypes for exported library functions. */

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/* Initialize the thread debug support library. */

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extern td_err_e td_init (void);

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/* Historical relict. Should not be used anymore. */

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extern td_err_e td_log (void);

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/* Return list of symbols the library can request. */

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extern const char **td_symbol_list (void);

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/* Generate new thread debug library handle for process PS. */

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extern td_err_e td_ta_new (struct ps_prochandle *__ps, td_thragent_t **__ta);

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/* Free resources allocated for TA. */

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extern td_err_e td_ta_delete (td_thragent_t *__ta);

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/* Get number of currently running threads in process associated with TA. */

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extern td_err_e td_ta_get_nthreads (const td_thragent_t *__ta, int *__np);

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/* Return process handle passed in `td_ta_new' for process associated with

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TA. */

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extern td_err_e td_ta_get_ph (const td_thragent_t *__ta,

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struct ps_prochandle **__ph);

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/* Map thread library handle PT to thread debug library handle for process

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associated with TA and store result in *TH. */

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extern td_err_e td_ta_map_id2thr (const td_thragent_t *__ta, pthread_t __pt,

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td_thrhandle_t *__th);

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/* Map process ID LWPID to thread debug library handle for process

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associated with TA and store result in *TH. */

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extern td_err_e td_ta_map_lwp2thr (const td_thragent_t *__ta, lwpid_t __lwpid,

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td_thrhandle_t *__th);

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/* Call for each thread in a process associated with TA the callback function

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CALLBACK. */

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extern td_err_e td_ta_thr_iter (const td_thragent_t *__ta,

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td_thr_iter_f *__callback, void *__cbdata_p,

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td_thr_state_e __state, int __ti_pri,

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sigset_t *__ti_sigmask_p,

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unsigned int __ti_user_flags);

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/* Call for each defined thread local data entry the callback function KI. */

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extern td_err_e td_ta_tsd_iter (const td_thragent_t *__ta, td_key_iter_f *__ki,

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void *__p);

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/* Get event address for EVENT. */

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extern td_err_e td_ta_event_addr (const td_thragent_t *__ta,

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td_event_e __event, td_notify_t *__ptr);

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/* Enable EVENT in global mask. */

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extern td_err_e td_ta_set_event (const td_thragent_t *__ta,

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td_thr_events_t *__event);

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/* Disable EVENT in global mask. */

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extern td_err_e td_ta_clear_event (const td_thragent_t *__ta,

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td_thr_events_t *__event);

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/* Return information about last event. */

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extern td_err_e td_ta_event_getmsg (const td_thragent_t *__ta,

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td_event_msg_t *__msg);

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/* Set suggested concurrency level for process associated with TA. */

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extern td_err_e td_ta_setconcurrency (const td_thragent_t *__ta, int __level);

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/* Enable collecting statistics for process associated with TA. */

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extern td_err_e td_ta_enable_stats (const td_thragent_t *__ta, int __enable);

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/* Reset statistics. */

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extern td_err_e td_ta_reset_stats (const td_thragent_t *__ta);

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/* Retrieve statistics from process associated with TA. */

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extern td_err_e td_ta_get_stats (const td_thragent_t *__ta,

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td_ta_stats_t *__statsp);

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/* Validate that TH is a thread handle. */

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extern td_err_e td_thr_validate (const td_thrhandle_t *__th);

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/* Return information about thread TH. */

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extern td_err_e td_thr_get_info (const td_thrhandle_t *__th,

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td_thrinfo_t *__infop);

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/* Retrieve floating-point register contents of process running thread TH. */

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extern td_err_e td_thr_getfpregs (const td_thrhandle_t *__th,

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prfpregset_t *__regset);

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/* Retrieve general register contents of process running thread TH. */

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extern td_err_e td_thr_getgregs (const td_thrhandle_t *__th,

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prgregset_t __gregs);

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/* Retrieve extended register contents of process running thread TH. */

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extern td_err_e td_thr_getxregs (const td_thrhandle_t *__th, void *__xregs);

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/* Get size of extended register set of process running thread TH. */

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extern td_err_e td_thr_getxregsize (const td_thrhandle_t *__th, int *__sizep);

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/* Set floating-point register contents of process running thread TH. */

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extern td_err_e td_thr_setfpregs (const td_thrhandle_t *__th,

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const prfpregset_t *__fpregs);

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/* Set general register contents of process running thread TH. */

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extern td_err_e td_thr_setgregs (const td_thrhandle_t *__th,

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prgregset_t __gregs);

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/* Set extended register contents of process running thread TH. */

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extern td_err_e td_thr_setxregs (const td_thrhandle_t *__th,

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const void *__addr);

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/* Get address of the given module's TLS storage area for the given thread. */

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extern td_err_e td_thr_tlsbase (const td_thrhandle_t *__th,

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unsigned long int __modid,

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psaddr_t *__base);

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/* Get address of thread local variable. */

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extern td_err_e td_thr_tls_get_addr (const td_thrhandle_t *__th,

[412] Fix | Delete

psaddr_t __map_address, size_t __offset,

[413] Fix | Delete

psaddr_t *__address);

[414] Fix | Delete

[415] Fix | Delete

[416] Fix | Delete

/* Enable reporting for EVENT for thread TH. */

[417] Fix | Delete

extern td_err_e td_thr_event_enable (const td_thrhandle_t *__th, int __event);

[418] Fix | Delete

[419] Fix | Delete

/* Enable EVENT for thread TH. */

[420] Fix | Delete

extern td_err_e td_thr_set_event (const td_thrhandle_t *__th,

[421] Fix | Delete

td_thr_events_t *__event);

[422] Fix | Delete

[423] Fix | Delete

/* Disable EVENT for thread TH. */

[424] Fix | Delete

extern td_err_e td_thr_clear_event (const td_thrhandle_t *__th,

[425] Fix | Delete

td_thr_events_t *__event);

[426] Fix | Delete

[427] Fix | Delete

/* Get event message for thread TH. */

[428] Fix | Delete

extern td_err_e td_thr_event_getmsg (const td_thrhandle_t *__th,

[429] Fix | Delete

td_event_msg_t *__msg);

[430] Fix | Delete

[431] Fix | Delete

[432] Fix | Delete

/* Set priority of thread TH. */

[433] Fix | Delete

extern td_err_e td_thr_setprio (const td_thrhandle_t *__th, int __prio);

[434] Fix | Delete

[435] Fix | Delete

[436] Fix | Delete

/* Set pending signals for thread TH. */

[437] Fix | Delete

extern td_err_e td_thr_setsigpending (const td_thrhandle_t *__th,

[438] Fix | Delete

unsigned char __n, const sigset_t *__ss);

[439] Fix | Delete

[440] Fix | Delete

/* Set signal mask for thread TH. */

[441] Fix | Delete

extern td_err_e td_thr_sigsetmask (const td_thrhandle_t *__th,

[442] Fix | Delete

const sigset_t *__ss);

[443] Fix | Delete

[444] Fix | Delete

[445] Fix | Delete

/* Return thread local data associated with key TK in thread TH. */

[446] Fix | Delete

extern td_err_e td_thr_tsd (const td_thrhandle_t *__th,

[447] Fix | Delete

const thread_key_t __tk, void **__data);

[448] Fix | Delete

[449] Fix | Delete

[450] Fix | Delete

/* Suspend execution of thread TH. */

[451] Fix | Delete

extern td_err_e td_thr_dbsuspend (const td_thrhandle_t *__th);

[452] Fix | Delete

[453] Fix | Delete

/* Resume execution of thread TH. */

[454] Fix | Delete

extern td_err_e td_thr_dbresume (const td_thrhandle_t *__th);

[455] Fix | Delete

[456] Fix | Delete

#endif /* thread_db.h */

[457] Fix | Delete

[458] Fix | Delete