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* init.c (__nptl_initial_report_events): New variable.

Browse Source 
(__pthread_initialize_minimal_internal): Initialize pd->report_events
	to that.
This commit is contained in:
Roland McGrath 2007-06-26 06:47:56 +00:00
parent 0ecf9c1064
commit 7d9d8bd189
15 changed files with 221 additions and 84 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
nptl/ChangeLog
View File

@ -1,3 +1,9 @@
2007-05-16 Roland McGrath <roland@redhat.com>
* init.c (__nptl_initial_report_events): New variable.
(__pthread_initialize_minimal_internal): Initialize pd->report_events
to that.
2007-06-22 Jakub Jelinek <jakub@redhat.com>
* pthread_getattr_np.c (pthread_getattr_np): Clear cpuset and

23
nptl_db/ChangeLog
View File

@ -1,3 +1,26 @@
2007-05-16 Roland McGrath <roland@redhat.com>
* td_thr_get_info.c: Fake the results for TH->th_unique == 0.
* td_thr_validate.c: Likewise.
* td_thr_setgregs.c: Likewise.
* td_thr_setfpregs.c: Likewise.
* td_thr_getgregs.c: Likewise.
* td_thr_getfpregs.c: Likewise.
* td_thr_tlsbase.c: Likewise.
* structs.def: Add DB_VARIABLE (__nptl_initial_report_events).
* db_info.c: Add necessary declaration.
* td_thr_event_enable.c: Set __nptl_initial_report_events too.
* td_ta_thr_iter.c (iterate_thread_list): Make FAKE_EMPTY bool.
Use th_unique=0 in fake descriptor before initialization.
* td_ta_map_lwp2thr.c (__td_ta_lookup_th_unique): New function, broken
out of ...
(td_ta_map_lwp2thr): ... here, call it. But don't before __stack_user
is initialized, then fake a handle with th_unique=0.
* thread_dbP.h: Declare it.
2006-10-26 Pete Eberlein <eberlein@us.ibm.com>
* nptl_db/db_info.c [TLS_DTV_AT_TP]: Fixed size init for dtvp

4
nptl_db/db_info.c
View File

@ -1,7 +1,7 @@
/* This file is included by pthread_create.c to define in libpthread
all the magic symbols required by libthread_db.
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -38,6 +38,8 @@ typedef struct
typedef struct link_map link_map;
/* Actually static in nptl/init.c, but we only need it for typeof. */
extern bool __nptl_initial_report_events;
#define schedparam_sched_priority schedparam.sched_priority

3
nptl_db/structs.def
View File

@ -1,5 +1,5 @@
/* List of types and symbols in libpthread examined by libthread_db.
Copyright (C) 2003, 2006 Free Software Foundation, Inc.
Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -56,6 +56,7 @@ DB_FUNCTION (__nptl_death_event)
DB_SYMBOL (__nptl_threads_events)
DB_VARIABLE (__nptl_nthreads)
DB_VARIABLE (__nptl_last_event)
DB_VARIABLE (__nptl_initial_report_events)
DB_ARRAY_VARIABLE (__pthread_keys)
DB_STRUCT (pthread_key_struct)

69
nptl_db/td_ta_map_lwp2thr.c
View File

@ -1,5 +1,5 @@
/* Which thread is running on an LWP?
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -24,8 +24,8 @@
td_err_e
td_ta_map_lwp2thr (const td_thragent_t *ta_arg,
lwpid_t lwpid, td_thrhandle_t *th)
__td_ta_lookup_th_unique (const td_thragent_t *ta_arg,
lwpid_t lwpid, td_thrhandle_t *th)
{
td_thragent_t *const ta = (td_thragent_t *) ta_arg;
ps_err_e err;
@ -118,9 +118,6 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg,
switch (ta->ta_howto)
{
case ta_howto_unknown:
return TD_DBERR;
default:
return TD_DBERR;
@ -132,6 +129,7 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg,
0, regs, &addr);
if (terr != TD_OK)
return terr;
/* In this descriptor the nelem word is overloaded as the bias. */
addr += (int32_t) DB_DESC_NELEM (ta->ta_howto_data.reg);
th->th_unique = addr;
@ -143,22 +141,22 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg,
if (&ps_get_thread_area == NULL)
return TD_NOCAPAB;
/* A la x86-64, there is a constant magic index for get_thread_area. */
if (ps_get_thread_area (ta->ph, lwpid,
ta->ta_howto_data.const_thread_area,
&th->th_unique) != PS_OK)
return TD_ERR; /* XXX Other error value? */
break;
/* A la x86-64, there is a magic index for get_thread_area. */
if (ps_get_thread_area (ta->ph, lwpid,
ta->ta_howto_data.const_thread_area,
&th->th_unique) != PS_OK)
return TD_ERR; /* XXX Other error value? */
break;
case ta_howto_reg_thread_area:
case ta_howto_reg_thread_area:
if (&ps_get_thread_area == NULL)
return TD_NOCAPAB;
/* A la i386, there is a register with an index for get_thread_area. */
if (ps_lgetregs (ta->ph, lwpid, regs) != PS_OK)
return TD_ERR;
terr = _td_fetch_value_local (ta, ta->ta_howto_data.reg_thread_area, -1,
0, regs, &addr);
/* A la i386, a register holds the index for get_thread_area. */
if (ps_lgetregs (ta->ph, lwpid, regs) != PS_OK)
return TD_ERR;
terr = _td_fetch_value_local (ta, ta->ta_howto_data.reg_thread_area,
-1, 0, regs, &addr);
if (terr != TD_OK)
return terr;
/* In this descriptor the nelem word is overloaded as scale factor. */
@ -172,7 +170,40 @@ td_ta_map_lwp2thr (const td_thragent_t *ta_arg,
}
/* Found it. Now complete the `td_thrhandle_t' object. */
th->th_ta_p = (td_thragent_t *) ta;
th->th_ta_p = ta;
return TD_OK;
}
td_err_e
td_ta_map_lwp2thr (const td_thragent_t *ta_arg,
lwpid_t lwpid, td_thrhandle_t *th)
{
td_thragent_t *const ta = (td_thragent_t *) ta_arg;
/* We cannot rely on thread registers and such information at all
before __pthread_initialize_minimal has gotten far enough. They
sometimes contain garbage that would confuse us, left by the kernel
at exec. So if it looks like initialization is incomplete, we only
fake a special descriptor for the initial thread. */
psaddr_t list;
td_err_e err = DB_GET_SYMBOL (list, ta, __stack_user);
if (err != TD_OK)
return err;
err = DB_GET_FIELD (list, ta, list, list_t, next, 0);
if (err != TD_OK)
return err;
if (list == 0)
{
if (ps_getpid (ta->ph) != lwpid)
return TD_ERR;
th->th_ta_p = ta;
th->th_unique = 0;
return TD_OK;
}
return __td_ta_lookup_th_unique (ta_arg, lwpid, th);
}

25
nptl_db/td_ta_thr_iter.c
View File

@ -1,5 +1,6 @@
/* Iterate over a process's threads.
Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
Copyright (C) 1999,2000,2001,2002,2003,2004,2007
Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -24,7 +25,7 @@
static td_err_e
iterate_thread_list (td_thragent_t *ta, td_thr_iter_f *callback,
void *cbdata_p, td_thr_state_e state, int ti_pri,
psaddr_t head, int fake_empty)
psaddr_t head, bool fake_empty)
{
td_err_e err;
psaddr_t next, ofs;
@ -41,13 +42,13 @@ iterate_thread_list (td_thragent_t *ta, td_thr_iter_f *callback,
if (next == 0 && fake_empty)
{
/* __pthread_initialize_minimal has not run.
There is just the main thread to return. */
td_thrhandle_t th;
err = td_ta_map_lwp2thr (ta, ps_getpid (ta->ph), &th);
if (err == TD_OK)
err = callback (&th, cbdata_p) != 0 ? TD_DBERR : TD_OK;
return err;
/* __pthread_initialize_minimal has not run. There is just the main
thread to return. We cannot rely on its thread register. They
sometimes contain garbage that would confuse us, left by the
kernel at exec. So if it looks like initialization is incomplete,
we only fake a special descriptor for the initial thread. */
td_thrhandle_t th = { ta, 0 };
return callback (&th, cbdata_p) != 0 ? TD_DBERR : TD_OK;
}
/* Cache the offset from struct pthread to its list_t member. */
@ -136,13 +137,15 @@ td_ta_thr_iter (const td_thragent_t *ta_arg, td_thr_iter_f *callback,
err = DB_GET_SYMBOL (list, ta, __stack_user);
if (err == TD_OK)
err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri, list, 1);
err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri,
list, true);
/* And the threads with stacks allocated by the implementation. */
if (err == TD_OK)
err = DB_GET_SYMBOL (list, ta, stack_used);
if (err == TD_OK)
err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri, list, 0);
err = iterate_thread_list (ta, callback, cbdata_p, state, ti_pri,
list, false);
return err;
}

24
nptl_db/td_thr_event_enable.c
View File

@ -1,5 +1,5 @@
/* Enable event process-wide.
Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
Copyright (C) 1999, 2001, 2002, 2003, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -28,7 +28,25 @@ td_thr_event_enable (th, onoff)
{
LOG ("td_thr_event_enable");
/* Write the new value into the thread data structure. */
return DB_PUT_FIELD (th->th_ta_p, th->th_unique, pthread, report_events, 0,
if (th->th_unique != 0)
{
/* Write the new value into the thread data structure. */
td_err_e err = DB_PUT_FIELD (th->th_ta_p, th->th_unique, pthread,
report_events, 0,
(psaddr_t) 0 + (onoff != 0));
if (err != TD_OK)
return err;
/* Just in case we are in the window between initializing __stack_user
and copying from __nptl_initial_report_events, we set it too.
It doesn't hurt to do this for non-initial threads, since it
won't be consulted again anyway. It would take another fetch
to get the tid and determine this isn't the initial thread,
so just do it always. */
}
/* We are faking it for the initial thread before its thread
descriptor is set up. */
return DB_PUT_VALUE (th->th_ta_p, __nptl_initial_report_events, 0,
(psaddr_t) 0 + (onoff != 0));
}

77
nptl_db/td_thr_get_info.c
View File

@ -1,5 +1,5 @@
/* Get thread information.
Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
Copyright (C) 1999,2000,2001,2002,2003,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -32,35 +32,49 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop)
LOG ("td_thr_get_info");
/* Copy the whole descriptor in once so we can access the several
fields locally. Excess copying in one go is much better than
multiple ps_pdread calls. */
err = DB_GET_STRUCT (copy, th->th_ta_p, th->th_unique, pthread);
if (err != TD_OK)
return err;
if (th->th_unique == 0)
{
/* Special case for the main thread before initialization. */
copy = NULL;
tls = 0;
cancelhandling = 0;
schedprio = 0;
tid = 0;
err = DB_GET_VALUE (report_events, th->th_ta_p,
__nptl_initial_report_events, 0);
}
else
{
/* Copy the whole descriptor in once so we can access the several
fields locally. Excess copying in one go is much better than
multiple ps_pdread calls. */
err = DB_GET_STRUCT (copy, th->th_ta_p, th->th_unique, pthread);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_ADDRESS (tls, th->th_ta_p, th->th_unique,
pthread, specific, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_ADDRESS (tls, th->th_ta_p, th->th_unique,
pthread, specific, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (schedpolicy, th->th_ta_p, copy, pthread,
schedpolicy, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (schedprio, th->th_ta_p, copy, pthread,
schedparam_sched_priority, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread,
cancelhandling, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread,
report_events, 0);
err = DB_GET_FIELD_LOCAL (schedpolicy, th->th_ta_p, copy, pthread,
schedpolicy, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (schedprio, th->th_ta_p, copy, pthread,
schedparam_sched_priority, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (tid, th->th_ta_p, copy, pthread, tid, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (cancelhandling, th->th_ta_p, copy, pthread,
cancelhandling, 0);
if (err != TD_OK)
return err;
err = DB_GET_FIELD_LOCAL (report_events, th->th_ta_p, copy, pthread,
report_events, 0);
}
if (err != TD_OK)
return err;
@ -87,9 +101,10 @@ td_thr_get_info (const td_thrhandle_t *th, td_thrinfo_t *infop)
infop->ti_lid = tid == 0 ? ps_getpid (th->th_ta_p->ph) : (uintptr_t) tid;
infop->ti_traceme = report_events != 0;
err = DB_GET_FIELD_LOCAL (infop->ti_startfunc, th->th_ta_p, copy, pthread,
start_routine, 0);
if (err == TD_OK)
if (copy != NULL)
err = DB_GET_FIELD_LOCAL (infop->ti_startfunc, th->th_ta_p, copy, pthread,
start_routine, 0);
if (copy != NULL && err == TD_OK)
{
uint32_t idx;
for (idx = 0; idx < TD_EVENTSIZE; ++idx)

7
nptl_db/td_thr_getfpregs.c
View File

@ -1,5 +1,5 @@
/* Get a thread's floating-point register set.
Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
Copyright (C) 1999, 2001, 2002, 2003, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -29,6 +29,11 @@ td_thr_getfpregs (const td_thrhandle_t *th, prfpregset_t *regset)
LOG ("td_thr_getfpregs");
if (th->th_unique == 0)
/* Special case for the main thread before initialization. */
return ps_lgetfpregs (th->th_ta_p->ph, ps_getpid (th->th_ta_p->ph),
regset) != PS_OK ? TD_ERR : TD_OK;
/* We have to get the state and the PID for this thread. */
err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread,
cancelhandling, 0);

7
nptl_db/td_thr_getgregs.c
View File

@ -1,5 +1,5 @@
/* Get a thread's general register set.
Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -29,6 +29,11 @@ td_thr_getgregs (const td_thrhandle_t *th, prgregset_t regset)
LOG ("td_thr_getgregs");
if (th->th_unique == 0)
/* Special case for the main thread before initialization. */
return ps_lgetregs (th->th_ta_p->ph, ps_getpid (th->th_ta_p->ph),
regset) != PS_OK ? TD_ERR : TD_OK;
/* We have to get the state and the PID for this thread. */
err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread,
cancelhandling, 0);

7
nptl_db/td_thr_setfpregs.c
View File

@ -1,5 +1,5 @@
/* Set a thread's floating-point register set.
Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
Copyright (C) 1999, 2001, 2002, 2003, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -29,6 +29,11 @@ td_thr_setfpregs (const td_thrhandle_t *th, const prfpregset_t *fpregs)
LOG ("td_thr_setfpregs");
if (th->th_unique == 0)
/* Special case for the main thread before initialization. */
return ps_lsetfpregs (th->th_ta_p->ph, ps_getpid (th->th_ta_p->ph),
fpregs) != PS_OK ? TD_ERR : TD_OK;
/* We have to get the state and the PID for this thread. */
err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread,
cancelhandling, 0);

7
nptl_db/td_thr_setgregs.c
View File

@ -1,5 +1,5 @@
/* Set a thread's general register set.
Copyright (C) 1999, 2001, 2002, 2003 Free Software Foundation, Inc.
Copyright (C) 1999, 2001, 2002, 2003, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -29,6 +29,11 @@ td_thr_setgregs (const td_thrhandle_t *th, prgregset_t gregs)
LOG ("td_thr_setgregs");
if (th->th_unique == 0)
/* Special case for the main thread before initialization. */
return ps_lsetregs (th->th_ta_p->ph, ps_getpid (th->th_ta_p->ph),
gregs) != PS_OK ? TD_ERR : TD_OK;
/* We have to get the state and the PID for this thread. */
err = DB_GET_FIELD (cancelhandling, th->th_ta_p, th->th_unique, pthread,
cancelhandling, 0);

25
nptl_db/td_thr_tlsbase.c
View File

@ -1,5 +1,5 @@
/* Locate TLS data for a thread.
Copyright (C) 2003, 2006 Free Software Foundation, Inc.
Copyright (C) 2003, 2006, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -30,8 +30,29 @@ td_thr_tlsbase (const td_thrhandle_t *th,
if (modid < 1)
return TD_NOTLS;
psaddr_t pd = th->th_unique;
if (pd == 0)
{
/* This is the fake handle for the main thread before libpthread
initialization. We are using 0 for its th_unique because we can't
trust that its thread register has been initialized. But we need
a real pointer to have any TLS access work. In case of dlopen'd
libpthread, initialization might not be for quite some time. So
try looking up the thread register now. Worst case, it's nonzero
uninitialized garbage and we get bogus results for TLS access
attempted too early. Tough. */
td_thrhandle_t main_th;
err = __td_ta_lookup_th_unique (th->th_ta_p, ps_getpid (th->th_ta_p->ph),
&main_th);
if (err == 0)
pd = main_th.th_unique;
if (pd == 0)
return TD_TLSDEFER;
}
/* Get the DTV pointer from the thread descriptor. */
err = DB_GET_FIELD (dtv, th->th_ta_p, th->th_unique, pthread, dtvp, 0);
err = DB_GET_FIELD (dtv, th->th_ta_p, pd, pthread, dtvp, 0);
if (err != TD_OK)
return err;

16
nptl_db/td_thr_validate.c
View File

@ -1,5 +1,5 @@
/* Validate a thread handle.
Copyright (C) 1999, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 1999,2001,2002,2003,2004,2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
@ -75,16 +75,10 @@ td_thr_validate (const td_thrhandle_t *th)
if (err == TD_OK)
err = check_thread_list (th, list, &uninit);
if (err == TD_NOTHR && uninit)
{
/* __pthread_initialize_minimal has not run yet.
But the main thread still has a valid ID. */
td_thrhandle_t main_th;
err = td_ta_map_lwp2thr (th->th_ta_p,
ps_getpid (th->th_ta_p->ph), &main_th);
if (err == TD_OK && th->th_unique != main_th.th_unique)
err = TD_NOTHR;
}
if (err == TD_NOTHR && uninit && th->th_unique == 0)
/* __pthread_initialize_minimal has not run yet.
There is only the special case thread handle. */
err = TD_OK;
}
return err;

5
nptl_db/thread_dbP.h
View File

@ -1,5 +1,5 @@
/* Private header for thread debug library
Copyright (C) 2003, 2004 Free Software Foundation, Inc.
Copyright (C) 2003, 2004, 2007 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -251,4 +251,7 @@ extern td_err_e _td_store_value_local (td_thragent_t *ta,
extern td_err_e _td_check_sizeof (td_thragent_t *ta, uint32_t *sizep,
int sizep_name) attribute_hidden;
extern td_err_e __td_ta_lookup_th_unique (const td_thragent_t *ta,
lwpid_t lwpid, td_thrhandle_t *th);
#endif /* thread_dbP.h */