1296 lines
37 KiB
C
1296 lines
37 KiB
C
/* Solaris threads debugging interface.
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Copyright (C) 1996-2016 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This module implements a sort of half target that sits between the
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machine-independent parts of GDB and the /proc interface (procfs.c)
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to provide access to the Solaris user-mode thread implementation.
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Solaris threads are true user-mode threads, which are invoked via
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the thr_* and pthread_* (native and POSIX respectivly) interfaces.
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These are mostly implemented in user-space, with all thread context
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kept in various structures that live in the user's heap. These
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should not be confused with lightweight processes (LWPs), which are
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implemented by the kernel, and scheduled without explicit
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intervention by the process.
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Just to confuse things a little, Solaris threads (both native and
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POSIX) are actually implemented using LWPs. In general, there are
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going to be more threads than LWPs. There is no fixed
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correspondence between a thread and an LWP. When a thread wants to
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run, it gets scheduled onto the first available LWP and can
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therefore migrate from one LWP to another as time goes on. A
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sleeping thread may not be associated with an LWP at all!
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To make it possible to mess with threads, Sun provides a library
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called libthread_db.so.1 (not to be confused with
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libthread_db.so.0, which doesn't have a published interface). This
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interface has an upper part, which it provides, and a lower part
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which we provide. The upper part consists of the td_* routines,
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which allow us to find all the threads, query their state, etc...
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The lower part consists of all of the ps_*, which are used by the
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td_* routines to read/write memory, manipulate LWPs, lookup
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symbols, etc... The ps_* routines actually do most of their work
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by calling functions in procfs.c. */
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#include "defs.h"
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#include <thread.h>
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#include <proc_service.h>
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#include <thread_db.h>
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#include "gdbthread.h"
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#include "target.h"
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#include "inferior.h"
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <dlfcn.h>
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#include "gdbcmd.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "solib.h"
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#include "symfile.h"
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#include "observer.h"
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#include "procfs.h"
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#include "symtab.h"
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#include "minsyms.h"
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#include "objfiles.h"
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struct target_ops sol_thread_ops;
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* This struct is defined by us, but mainly used for the proc_service
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interface. We don't have much use for it, except as a handy place
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to get a real PID for memory accesses. */
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struct ps_prochandle
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{
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ptid_t ptid;
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};
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struct string_map
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{
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int num;
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char *str;
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};
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static struct ps_prochandle main_ph;
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static td_thragent_t *main_ta;
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static int sol_thread_active = 0;
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static void init_sol_thread_ops (void);
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/* Default definitions: These must be defined in tm.h if they are to
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be shared with a process module such as procfs. */
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/* Pointers to routines from libthread_db resolved by dlopen(). */
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static void (*p_td_log)(const int on_off);
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static td_err_e (*p_td_ta_new)(const struct ps_prochandle *ph_p,
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td_thragent_t **ta_pp);
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static td_err_e (*p_td_ta_delete)(td_thragent_t *ta_p);
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static td_err_e (*p_td_init)(void);
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static td_err_e (*p_td_ta_get_ph)(const td_thragent_t *ta_p,
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struct ps_prochandle **ph_pp);
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static td_err_e (*p_td_ta_get_nthreads)(const td_thragent_t *ta_p,
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int *nthread_p);
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static td_err_e (*p_td_ta_tsd_iter)(const td_thragent_t *ta_p,
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td_key_iter_f *cb, void *cbdata_p);
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static td_err_e (*p_td_ta_thr_iter)(const td_thragent_t *ta_p,
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td_thr_iter_f *cb, 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 ti_user_flags);
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static td_err_e (*p_td_thr_validate)(const td_thrhandle_t *th_p);
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static td_err_e (*p_td_thr_tsd)(const td_thrhandle_t * th_p,
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const thread_key_t key, void **data_pp);
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static td_err_e (*p_td_thr_get_info)(const td_thrhandle_t *th_p,
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td_thrinfo_t *ti_p);
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static td_err_e (*p_td_thr_getfpregs)(const td_thrhandle_t *th_p,
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prfpregset_t *fpregset);
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static td_err_e (*p_td_thr_getxregsize)(const td_thrhandle_t *th_p,
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int *xregsize);
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static td_err_e (*p_td_thr_getxregs)(const td_thrhandle_t *th_p,
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const caddr_t xregset);
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static td_err_e (*p_td_thr_sigsetmask)(const td_thrhandle_t *th_p,
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const sigset_t ti_sigmask);
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static td_err_e (*p_td_thr_setprio)(const td_thrhandle_t *th_p,
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const int ti_pri);
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static td_err_e (*p_td_thr_setsigpending)(const td_thrhandle_t *th_p,
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const uchar_t ti_pending_flag,
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const sigset_t ti_pending);
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static td_err_e (*p_td_thr_setfpregs)(const td_thrhandle_t *th_p,
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const prfpregset_t *fpregset);
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static td_err_e (*p_td_thr_setxregs)(const td_thrhandle_t *th_p,
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const caddr_t xregset);
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static td_err_e (*p_td_ta_map_id2thr)(const td_thragent_t *ta_p,
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thread_t tid,
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td_thrhandle_t *th_p);
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static td_err_e (*p_td_ta_map_lwp2thr)(const td_thragent_t *ta_p,
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lwpid_t lwpid,
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td_thrhandle_t *th_p);
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static td_err_e (*p_td_thr_getgregs)(const td_thrhandle_t *th_p,
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prgregset_t regset);
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static td_err_e (*p_td_thr_setgregs)(const td_thrhandle_t *th_p,
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const prgregset_t regset);
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/* Return the libthread_db error string associated with ERRCODE. If
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ERRCODE is unknown, return an appropriate message. */
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static char *
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td_err_string (td_err_e errcode)
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{
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static struct string_map td_err_table[] =
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{
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{ TD_OK, "generic \"call succeeded\"" },
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{ TD_ERR, "generic error." },
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{ TD_NOTHR, "no thread can be found to satisfy query" },
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{ TD_NOSV, "no synch. variable can be found to satisfy query" },
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{ TD_NOLWP, "no lwp can be found to satisfy query" },
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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, "td_thr_event_getmsg() called when there was no message" },
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{ TD_NOFPREGS, "FPU register set not available for given thread" },
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{ TD_NOLIBTHREAD, "application not linked with libthread" },
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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, "Debugger service failed" },
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{ TD_NOAPLIC, "Operation not applicable to" },
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{ TD_NOTSD, "No thread specific data for this thread" },
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{ TD_MALLOC, "Malloc failed" },
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{ TD_PARTIALREG, "Only part of register set was written/read" },
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{ TD_NOXREGS, "X register set not available for given thread" }
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};
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const int td_err_size = sizeof td_err_table / sizeof (struct string_map);
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int i;
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static char buf[50];
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for (i = 0; i < td_err_size; i++)
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if (td_err_table[i].num == errcode)
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return td_err_table[i].str;
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xsnprintf (buf, sizeof (buf), "Unknown libthread_db error code: %d",
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errcode);
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return buf;
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}
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/* Return the libthread_db state string assicoated with STATECODE.
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If STATECODE is unknown, return an appropriate message. */
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static char *
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td_state_string (td_thr_state_e statecode)
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{
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static struct string_map td_thr_state_table[] =
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{
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{ TD_THR_ANY_STATE, "any state" },
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{ TD_THR_UNKNOWN, "unknown" },
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{ TD_THR_STOPPED, "stopped" },
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{ TD_THR_RUN, "run" },
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{ TD_THR_ACTIVE, "active" },
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{ TD_THR_ZOMBIE, "zombie" },
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{ TD_THR_SLEEP, "sleep" },
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{ TD_THR_STOPPED_ASLEEP, "stopped asleep" }
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};
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const int td_thr_state_table_size =
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sizeof td_thr_state_table / sizeof (struct string_map);
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int i;
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static char buf[50];
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for (i = 0; i < td_thr_state_table_size; i++)
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if (td_thr_state_table[i].num == statecode)
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return td_thr_state_table[i].str;
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xsnprintf (buf, sizeof (buf), "Unknown libthread_db state code: %d",
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statecode);
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return buf;
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}
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/* Convert a POSIX or Solaris thread ID into a LWP ID. If THREAD_ID
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doesn't exist, that's an error. If it's an inactive thread, return
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DEFAULT_LWP.
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NOTE: This function probably shouldn't call error(). */
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static ptid_t
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thread_to_lwp (ptid_t thread_id, int default_lwp)
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{
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td_thrinfo_t ti;
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td_thrhandle_t th;
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td_err_e val;
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if (ptid_lwp_p (thread_id))
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return thread_id; /* It's already an LWP ID. */
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/* It's a thread. Convert to LWP. */
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val = p_td_ta_map_id2thr (main_ta, ptid_get_tid (thread_id), &th);
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if (val == TD_NOTHR)
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return pid_to_ptid (-1); /* Thread must have terminated. */
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else if (val != TD_OK)
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error (_("thread_to_lwp: td_ta_map_id2thr %s"), td_err_string (val));
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val = p_td_thr_get_info (&th, &ti);
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if (val == TD_NOTHR)
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return pid_to_ptid (-1); /* Thread must have terminated. */
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else if (val != TD_OK)
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error (_("thread_to_lwp: td_thr_get_info: %s"), td_err_string (val));
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if (ti.ti_state != TD_THR_ACTIVE)
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{
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if (default_lwp != -1)
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return pid_to_ptid (default_lwp);
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error (_("thread_to_lwp: thread state not active: %s"),
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td_state_string (ti.ti_state));
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}
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return ptid_build (ptid_get_pid (thread_id), ti.ti_lid, 0);
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}
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/* Convert an LWP ID into a POSIX or Solaris thread ID. If LWP_ID
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doesn't exists, that's an error.
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NOTE: This function probably shouldn't call error(). */
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static ptid_t
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lwp_to_thread (ptid_t lwp)
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{
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td_thrinfo_t ti;
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td_thrhandle_t th;
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td_err_e val;
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if (ptid_tid_p (lwp))
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return lwp; /* It's already a thread ID. */
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/* It's an LWP. Convert it to a thread ID. */
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if (!target_thread_alive (lwp))
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return pid_to_ptid (-1); /* Must be a defunct LPW. */
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val = p_td_ta_map_lwp2thr (main_ta, ptid_get_lwp (lwp), &th);
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if (val == TD_NOTHR)
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return pid_to_ptid (-1); /* Thread must have terminated. */
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else if (val != TD_OK)
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error (_("lwp_to_thread: td_ta_map_lwp2thr: %s."), td_err_string (val));
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val = p_td_thr_validate (&th);
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if (val == TD_NOTHR)
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return lwp; /* Unknown to libthread; just return LPW, */
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else if (val != TD_OK)
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error (_("lwp_to_thread: td_thr_validate: %s."), td_err_string (val));
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val = p_td_thr_get_info (&th, &ti);
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if (val == TD_NOTHR)
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return pid_to_ptid (-1); /* Thread must have terminated. */
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else if (val != TD_OK)
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error (_("lwp_to_thread: td_thr_get_info: %s."), td_err_string (val));
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return ptid_build (ptid_get_pid (lwp), 0 , ti.ti_tid);
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}
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/* Most target vector functions from here on actually just pass
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through to the layer beneath, as they don't need to do anything
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specific for threads. */
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/* Take a program previously attached to and detaches it. The program
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resumes execution and will no longer stop on signals, etc. We'd
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better not have left any breakpoints in the program or it'll die
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when it hits one. For this to work, it may be necessary for the
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process to have been previously attached. It *might* work if the
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program was started via the normal ptrace (PTRACE_TRACEME). */
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static void
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sol_thread_detach (struct target_ops *ops, const char *args, int from_tty)
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{
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struct target_ops *beneath = find_target_beneath (ops);
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sol_thread_active = 0;
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inferior_ptid = pid_to_ptid (ptid_get_pid (main_ph.ptid));
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unpush_target (ops);
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beneath->to_detach (beneath, args, from_tty);
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}
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/* Resume execution of process PTID. If STEP is nozero, then just
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single step it. If SIGNAL is nonzero, restart it with that signal
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activated. We may have to convert PTID from a thread ID to an LWP
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ID for procfs. */
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static void
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sol_thread_resume (struct target_ops *ops,
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ptid_t ptid, int step, enum gdb_signal signo)
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{
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struct cleanup *old_chain;
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struct target_ops *beneath = find_target_beneath (ops);
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old_chain = save_inferior_ptid ();
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inferior_ptid = thread_to_lwp (inferior_ptid, ptid_get_pid (main_ph.ptid));
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if (ptid_get_pid (inferior_ptid) == -1)
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inferior_ptid = procfs_first_available ();
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if (ptid_get_pid (ptid) != -1)
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{
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ptid_t save_ptid = ptid;
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ptid = thread_to_lwp (ptid, -2);
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if (ptid_get_pid (ptid) == -2) /* Inactive thread. */
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error (_("This version of Solaris can't start inactive threads."));
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if (info_verbose && ptid_get_pid (ptid) == -1)
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warning (_("Specified thread %ld seems to have terminated"),
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ptid_get_tid (save_ptid));
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}
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beneath->to_resume (beneath, ptid, step, signo);
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do_cleanups (old_chain);
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}
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/* Wait for any threads to stop. We may have to convert PTID from a
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thread ID to an LWP ID, and vice versa on the way out. */
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static ptid_t
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sol_thread_wait (struct target_ops *ops,
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ptid_t ptid, struct target_waitstatus *ourstatus, int options)
|
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{
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ptid_t rtnval;
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ptid_t save_ptid;
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struct target_ops *beneath = find_target_beneath (ops);
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struct cleanup *old_chain;
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save_ptid = inferior_ptid;
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old_chain = save_inferior_ptid ();
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inferior_ptid = thread_to_lwp (inferior_ptid, ptid_get_pid (main_ph.ptid));
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if (ptid_get_pid (inferior_ptid) == -1)
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inferior_ptid = procfs_first_available ();
|
||
|
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if (ptid_get_pid (ptid) != -1)
|
||
{
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||
ptid_t save_ptid = ptid;
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||
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ptid = thread_to_lwp (ptid, -2);
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if (ptid_get_pid (ptid) == -2) /* Inactive thread. */
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error (_("This version of Solaris can't start inactive threads."));
|
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if (info_verbose && ptid_get_pid (ptid) == -1)
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warning (_("Specified thread %ld seems to have terminated"),
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ptid_get_tid (save_ptid));
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||
}
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rtnval = beneath->to_wait (beneath, ptid, ourstatus, options);
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||
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if (ourstatus->kind != TARGET_WAITKIND_EXITED)
|
||
{
|
||
/* Map the LWP of interest back to the appropriate thread ID. */
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||
rtnval = lwp_to_thread (rtnval);
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if (ptid_get_pid (rtnval) == -1)
|
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rtnval = save_ptid;
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||
|
||
/* See if we have a new thread. */
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if (ptid_tid_p (rtnval)
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&& !ptid_equal (rtnval, save_ptid)
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&& (!in_thread_list (rtnval)
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|| is_exited (rtnval)))
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add_thread (rtnval);
|
||
}
|
||
|
||
/* During process initialization, we may get here without the thread
|
||
package being initialized, since that can only happen after we've
|
||
found the shared libs. */
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return rtnval;
|
||
}
|
||
|
||
static void
|
||
sol_thread_fetch_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regnum)
|
||
{
|
||
thread_t thread;
|
||
td_thrhandle_t thandle;
|
||
td_err_e val;
|
||
prgregset_t gregset;
|
||
prfpregset_t fpregset;
|
||
gdb_gregset_t *gregset_p = &gregset;
|
||
gdb_fpregset_t *fpregset_p = &fpregset;
|
||
struct target_ops *beneath = find_target_beneath (ops);
|
||
|
||
if (!ptid_tid_p (inferior_ptid))
|
||
{
|
||
/* It's an LWP; pass the request on to the layer beneath. */
|
||
beneath->to_fetch_registers (beneath, regcache, regnum);
|
||
return;
|
||
}
|
||
|
||
/* Solaris thread: convert INFERIOR_PTID into a td_thrhandle_t. */
|
||
thread = ptid_get_tid (inferior_ptid);
|
||
if (thread == 0)
|
||
error (_("sol_thread_fetch_registers: thread == 0"));
|
||
|
||
val = p_td_ta_map_id2thr (main_ta, thread, &thandle);
|
||
if (val != TD_OK)
|
||
error (_("sol_thread_fetch_registers: td_ta_map_id2thr: %s"),
|
||
td_err_string (val));
|
||
|
||
/* Get the general-purpose registers. */
|
||
|
||
val = p_td_thr_getgregs (&thandle, gregset);
|
||
if (val != TD_OK && val != TD_PARTIALREG)
|
||
error (_("sol_thread_fetch_registers: td_thr_getgregs %s"),
|
||
td_err_string (val));
|
||
|
||
/* For SPARC, TD_PARTIALREG means that only %i0...%i7, %l0..%l7, %pc
|
||
and %sp are saved (by a thread context switch). */
|
||
|
||
/* And, now the floating-point registers. */
|
||
|
||
val = p_td_thr_getfpregs (&thandle, &fpregset);
|
||
if (val != TD_OK && val != TD_NOFPREGS)
|
||
error (_("sol_thread_fetch_registers: td_thr_getfpregs %s"),
|
||
td_err_string (val));
|
||
|
||
/* Note that we must call supply_gregset and supply_fpregset *after*
|
||
calling the td routines because the td routines call ps_lget*
|
||
which affect the values stored in the registers array. */
|
||
|
||
supply_gregset (regcache, (const gdb_gregset_t *) gregset_p);
|
||
supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset_p);
|
||
}
|
||
|
||
static void
|
||
sol_thread_store_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regnum)
|
||
{
|
||
thread_t thread;
|
||
td_thrhandle_t thandle;
|
||
td_err_e val;
|
||
prgregset_t gregset;
|
||
prfpregset_t fpregset;
|
||
|
||
if (!ptid_tid_p (inferior_ptid))
|
||
{
|
||
struct target_ops *beneath = find_target_beneath (ops);
|
||
|
||
/* It's an LWP; pass the request on to the layer beneath. */
|
||
beneath->to_store_registers (beneath, regcache, regnum);
|
||
return;
|
||
}
|
||
|
||
/* Solaris thread: convert INFERIOR_PTID into a td_thrhandle_t. */
|
||
thread = ptid_get_tid (inferior_ptid);
|
||
|
||
val = p_td_ta_map_id2thr (main_ta, thread, &thandle);
|
||
if (val != TD_OK)
|
||
error (_("sol_thread_store_registers: td_ta_map_id2thr %s"),
|
||
td_err_string (val));
|
||
|
||
if (regnum != -1)
|
||
{
|
||
/* Not writing all the registers. */
|
||
char old_value[MAX_REGISTER_SIZE];
|
||
|
||
/* Save new register value. */
|
||
regcache_raw_collect (regcache, regnum, old_value);
|
||
|
||
val = p_td_thr_getgregs (&thandle, gregset);
|
||
if (val != TD_OK)
|
||
error (_("sol_thread_store_registers: td_thr_getgregs %s"),
|
||
td_err_string (val));
|
||
val = p_td_thr_getfpregs (&thandle, &fpregset);
|
||
if (val != TD_OK)
|
||
error (_("sol_thread_store_registers: td_thr_getfpregs %s"),
|
||
td_err_string (val));
|
||
|
||
/* Restore new register value. */
|
||
regcache_raw_supply (regcache, regnum, old_value);
|
||
}
|
||
|
||
fill_gregset (regcache, (gdb_gregset_t *) &gregset, regnum);
|
||
fill_fpregset (regcache, (gdb_fpregset_t *) &fpregset, regnum);
|
||
|
||
val = p_td_thr_setgregs (&thandle, gregset);
|
||
if (val != TD_OK)
|
||
error (_("sol_thread_store_registers: td_thr_setgregs %s"),
|
||
td_err_string (val));
|
||
val = p_td_thr_setfpregs (&thandle, &fpregset);
|
||
if (val != TD_OK)
|
||
error (_("sol_thread_store_registers: td_thr_setfpregs %s"),
|
||
td_err_string (val));
|
||
}
|
||
|
||
/* Perform partial transfers on OBJECT. See target_read_partial and
|
||
target_write_partial for details of each variant. One, and only
|
||
one, of readbuf or writebuf must be non-NULL. */
|
||
|
||
static enum target_xfer_status
|
||
sol_thread_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf,
|
||
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
|
||
{
|
||
enum target_xfer_status retval;
|
||
struct cleanup *old_chain;
|
||
struct target_ops *beneath = find_target_beneath (ops);
|
||
|
||
old_chain = save_inferior_ptid ();
|
||
|
||
if (ptid_tid_p (inferior_ptid) || !target_thread_alive (inferior_ptid))
|
||
{
|
||
/* It's either a thread or an LWP that isn't alive. Any live
|
||
LWP will do so use the first available.
|
||
|
||
NOTE: We don't need to call switch_to_thread; we're just
|
||
reading memory. */
|
||
inferior_ptid = procfs_first_available ();
|
||
}
|
||
|
||
retval = beneath->to_xfer_partial (beneath, object, annex, readbuf,
|
||
writebuf, offset, len, xfered_len);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return retval;
|
||
}
|
||
|
||
static void
|
||
check_for_thread_db (void)
|
||
{
|
||
td_err_e err;
|
||
ptid_t ptid;
|
||
|
||
/* Don't attempt to use thread_db for remote targets. */
|
||
if (!(target_can_run (¤t_target) || core_bfd))
|
||
return;
|
||
|
||
/* Do nothing if we couldn't load libthread_db.so.1. */
|
||
if (p_td_ta_new == NULL)
|
||
return;
|
||
|
||
if (sol_thread_active)
|
||
/* Nothing to do. The thread library was already detected and the
|
||
target vector was already activated. */
|
||
return;
|
||
|
||
/* Now, initialize libthread_db. This needs to be done after the
|
||
shared libraries are located because it needs information from
|
||
the user's thread library. */
|
||
|
||
err = p_td_init ();
|
||
if (err != TD_OK)
|
||
{
|
||
warning (_("sol_thread_new_objfile: td_init: %s"), td_err_string (err));
|
||
return;
|
||
}
|
||
|
||
/* Now attempt to open a connection to the thread library. */
|
||
err = p_td_ta_new (&main_ph, &main_ta);
|
||
switch (err)
|
||
{
|
||
case TD_NOLIBTHREAD:
|
||
/* No thread library was detected. */
|
||
break;
|
||
|
||
case TD_OK:
|
||
printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
|
||
|
||
/* The thread library was detected. Activate the sol_thread target. */
|
||
push_target (&sol_thread_ops);
|
||
sol_thread_active = 1;
|
||
|
||
main_ph.ptid = inferior_ptid; /* Save for xfer_memory. */
|
||
ptid = lwp_to_thread (inferior_ptid);
|
||
if (ptid_get_pid (ptid) != -1)
|
||
inferior_ptid = ptid;
|
||
|
||
target_update_thread_list ();
|
||
break;
|
||
|
||
default:
|
||
warning (_("Cannot initialize thread debugging library: %s"),
|
||
td_err_string (err));
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* This routine is called whenever a new symbol table is read in, or
|
||
when all symbol tables are removed. libthread_db can only be
|
||
initialized when it finds the right variables in libthread.so.
|
||
Since it's a shared library, those variables don't show up until
|
||
the library gets mapped and the symbol table is read in. */
|
||
|
||
static void
|
||
sol_thread_new_objfile (struct objfile *objfile)
|
||
{
|
||
if (objfile != NULL)
|
||
check_for_thread_db ();
|
||
}
|
||
|
||
/* Clean up after the inferior dies. */
|
||
|
||
static void
|
||
sol_thread_mourn_inferior (struct target_ops *ops)
|
||
{
|
||
struct target_ops *beneath = find_target_beneath (ops);
|
||
|
||
sol_thread_active = 0;
|
||
|
||
unpush_target (ops);
|
||
|
||
beneath->to_mourn_inferior (beneath);
|
||
}
|
||
|
||
/* Return true if PTID is still active in the inferior. */
|
||
|
||
static int
|
||
sol_thread_alive (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
if (ptid_tid_p (ptid))
|
||
{
|
||
/* It's a (user-level) thread. */
|
||
td_err_e val;
|
||
td_thrhandle_t th;
|
||
int pid;
|
||
|
||
pid = ptid_get_tid (ptid);
|
||
if ((val = p_td_ta_map_id2thr (main_ta, pid, &th)) != TD_OK)
|
||
return 0; /* Thread not found. */
|
||
if ((val = p_td_thr_validate (&th)) != TD_OK)
|
||
return 0; /* Thread not valid. */
|
||
return 1; /* Known thread. */
|
||
}
|
||
else
|
||
{
|
||
struct target_ops *beneath = find_target_beneath (ops);
|
||
|
||
/* It's an LPW; pass the request on to the layer below. */
|
||
return beneath->to_thread_alive (beneath, ptid);
|
||
}
|
||
}
|
||
|
||
|
||
/* These routines implement the lower half of the thread_db interface,
|
||
i.e. the ps_* routines. */
|
||
|
||
/* Various versions of <proc_service.h> have slightly different
|
||
function prototypes. In particular, we have
|
||
|
||
NEWER OLDER
|
||
struct ps_prochandle * const struct ps_prochandle *
|
||
void* char*
|
||
const void* char*
|
||
int size_t
|
||
|
||
Which one you have depends on the Solaris version and what patches
|
||
you've applied. On the theory that there are only two major
|
||
variants, we have configure check the prototype of ps_pdwrite (),
|
||
and use that info to make appropriate typedefs here. */
|
||
|
||
#ifdef PROC_SERVICE_IS_OLD
|
||
typedef const struct ps_prochandle *gdb_ps_prochandle_t;
|
||
typedef char *gdb_ps_read_buf_t;
|
||
typedef char *gdb_ps_write_buf_t;
|
||
typedef int gdb_ps_size_t;
|
||
typedef psaddr_t gdb_ps_addr_t;
|
||
#else
|
||
typedef struct ps_prochandle *gdb_ps_prochandle_t;
|
||
typedef void *gdb_ps_read_buf_t;
|
||
typedef const void *gdb_ps_write_buf_t;
|
||
typedef size_t gdb_ps_size_t;
|
||
typedef psaddr_t gdb_ps_addr_t;
|
||
#endif
|
||
|
||
/* The next four routines are called by libthread_db to tell us to
|
||
stop and stop a particular process or lwp. Since GDB ensures that
|
||
these are all stopped by the time we call anything in thread_db,
|
||
these routines need to do nothing. */
|
||
|
||
/* Process stop. */
|
||
|
||
ps_err_e
|
||
ps_pstop (gdb_ps_prochandle_t ph)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Process continue. */
|
||
|
||
ps_err_e
|
||
ps_pcontinue (gdb_ps_prochandle_t ph)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* LWP stop. */
|
||
|
||
ps_err_e
|
||
ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* LWP continue. */
|
||
|
||
ps_err_e
|
||
ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Looks up the symbol LD_SYMBOL_NAME in the debugger's symbol table. */
|
||
|
||
ps_err_e
|
||
ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *ld_object_name,
|
||
const char *ld_symbol_name, gdb_ps_addr_t *ld_symbol_addr)
|
||
{
|
||
struct bound_minimal_symbol ms;
|
||
|
||
ms = lookup_minimal_symbol (ld_symbol_name, NULL, NULL);
|
||
if (!ms.minsym)
|
||
return PS_NOSYM;
|
||
|
||
*ld_symbol_addr = BMSYMBOL_VALUE_ADDRESS (ms);
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Common routine for reading and writing memory. */
|
||
|
||
static ps_err_e
|
||
rw_common (int dowrite, const struct ps_prochandle *ph, gdb_ps_addr_t addr,
|
||
gdb_byte *buf, int size)
|
||
{
|
||
int ret;
|
||
struct cleanup *old_chain;
|
||
|
||
old_chain = save_inferior_ptid ();
|
||
|
||
if (ptid_tid_p (inferior_ptid) || !target_thread_alive (inferior_ptid))
|
||
{
|
||
/* It's either a thread or an LWP that isn't alive. Any live
|
||
LWP will do so use the first available.
|
||
|
||
NOTE: We don't need to call switch_to_thread; we're just
|
||
reading memory. */
|
||
inferior_ptid = procfs_first_available ();
|
||
}
|
||
|
||
#if defined (__sparcv9)
|
||
/* For Sparc64 cross Sparc32, make sure the address has not been
|
||
accidentally sign-extended (or whatever) to beyond 32 bits. */
|
||
if (bfd_get_arch_size (exec_bfd) == 32)
|
||
addr &= 0xffffffff;
|
||
#endif
|
||
|
||
if (dowrite)
|
||
ret = target_write_memory (addr, (gdb_byte *) buf, size);
|
||
else
|
||
ret = target_read_memory (addr, (gdb_byte *) buf, size);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return (ret == 0 ? PS_OK : PS_ERR);
|
||
}
|
||
|
||
/* Copies SIZE bytes from target process .data segment to debugger memory. */
|
||
|
||
ps_err_e
|
||
ps_pdread (gdb_ps_prochandle_t ph, gdb_ps_addr_t addr,
|
||
gdb_ps_read_buf_t buf, gdb_ps_size_t size)
|
||
{
|
||
return rw_common (0, ph, addr, buf, size);
|
||
}
|
||
|
||
/* Copies SIZE bytes from debugger memory .data segment to target process. */
|
||
|
||
ps_err_e
|
||
ps_pdwrite (gdb_ps_prochandle_t ph, gdb_ps_addr_t addr,
|
||
gdb_ps_write_buf_t buf, gdb_ps_size_t size)
|
||
{
|
||
return rw_common (1, ph, addr, (gdb_byte *) buf, size);
|
||
}
|
||
|
||
/* Copies SIZE bytes from target process .text segment to debugger memory. */
|
||
|
||
ps_err_e
|
||
ps_ptread (gdb_ps_prochandle_t ph, gdb_ps_addr_t addr,
|
||
gdb_ps_read_buf_t buf, gdb_ps_size_t size)
|
||
{
|
||
return rw_common (0, ph, addr, buf, size);
|
||
}
|
||
|
||
/* Copies SIZE bytes from debugger memory .text segment to target process. */
|
||
|
||
ps_err_e
|
||
ps_ptwrite (gdb_ps_prochandle_t ph, gdb_ps_addr_t addr,
|
||
gdb_ps_write_buf_t buf, gdb_ps_size_t size)
|
||
{
|
||
return rw_common (1, ph, addr, (gdb_byte *) buf, size);
|
||
}
|
||
|
||
/* Get general-purpose registers for LWP. */
|
||
|
||
ps_err_e
|
||
ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
|
||
{
|
||
struct cleanup *old_chain;
|
||
struct regcache *regcache;
|
||
|
||
old_chain = save_inferior_ptid ();
|
||
|
||
inferior_ptid = ptid_build (ptid_get_pid (inferior_ptid), lwpid, 0);
|
||
regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch ());
|
||
|
||
target_fetch_registers (regcache, -1);
|
||
fill_gregset (regcache, (gdb_gregset_t *) gregset, -1);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Set general-purpose registers for LWP. */
|
||
|
||
ps_err_e
|
||
ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
|
||
const prgregset_t gregset)
|
||
{
|
||
struct cleanup *old_chain;
|
||
struct regcache *regcache;
|
||
|
||
old_chain = save_inferior_ptid ();
|
||
|
||
inferior_ptid = ptid_build (ptid_get_pid (inferior_ptid), lwpid, 0);
|
||
regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch ());
|
||
|
||
supply_gregset (regcache, (const gdb_gregset_t *) gregset);
|
||
target_store_registers (regcache, -1);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Log a message (sends to gdb_stderr). */
|
||
|
||
void
|
||
ps_plog (const char *fmt, ...)
|
||
{
|
||
va_list args;
|
||
|
||
va_start (args, fmt);
|
||
|
||
vfprintf_filtered (gdb_stderr, fmt, args);
|
||
}
|
||
|
||
/* Get size of extra register set. Currently a noop. */
|
||
|
||
ps_err_e
|
||
ps_lgetxregsize (gdb_ps_prochandle_t ph, lwpid_t lwpid, int *xregsize)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Get extra register set. Currently a noop. */
|
||
|
||
ps_err_e
|
||
ps_lgetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Set extra register set. Currently a noop. */
|
||
|
||
ps_err_e
|
||
ps_lsetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
|
||
{
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Get floating-point registers for LWP. */
|
||
|
||
ps_err_e
|
||
ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
|
||
prfpregset_t *fpregset)
|
||
{
|
||
struct cleanup *old_chain;
|
||
struct regcache *regcache;
|
||
|
||
old_chain = save_inferior_ptid ();
|
||
|
||
inferior_ptid = ptid_build (ptid_get_pid (inferior_ptid), lwpid, 0);
|
||
regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch ());
|
||
|
||
target_fetch_registers (regcache, -1);
|
||
fill_fpregset (regcache, (gdb_fpregset_t *) fpregset, -1);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return PS_OK;
|
||
}
|
||
|
||
/* Set floating-point regs for LWP. */
|
||
|
||
ps_err_e
|
||
ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
|
||
const prfpregset_t * fpregset)
|
||
{
|
||
struct cleanup *old_chain;
|
||
struct regcache *regcache;
|
||
|
||
old_chain = save_inferior_ptid ();
|
||
|
||
inferior_ptid = ptid_build (ptid_get_pid (inferior_ptid), lwpid, 0);
|
||
regcache = get_thread_arch_regcache (inferior_ptid, target_gdbarch ());
|
||
|
||
supply_fpregset (regcache, (const gdb_fpregset_t *) fpregset);
|
||
target_store_registers (regcache, -1);
|
||
|
||
do_cleanups (old_chain);
|
||
|
||
return PS_OK;
|
||
}
|
||
|
||
#ifdef PR_MODEL_LP64
|
||
/* Identify process as 32-bit or 64-bit. At the moment we're using
|
||
BFD to do this. There might be a more Solaris-specific
|
||
(e.g. procfs) method, but this ought to work. */
|
||
|
||
ps_err_e
|
||
ps_pdmodel (gdb_ps_prochandle_t ph, int *data_model)
|
||
{
|
||
if (exec_bfd == 0)
|
||
*data_model = PR_MODEL_UNKNOWN;
|
||
else if (bfd_get_arch_size (exec_bfd) == 32)
|
||
*data_model = PR_MODEL_ILP32;
|
||
else
|
||
*data_model = PR_MODEL_LP64;
|
||
|
||
return PS_OK;
|
||
}
|
||
#endif /* PR_MODEL_LP64 */
|
||
|
||
#if (defined(__i386__) || defined(__x86_64__)) && defined (sun)
|
||
|
||
/* Reads the local descriptor table of a LWP.
|
||
|
||
This function is necessary on x86-solaris only. Without it, the loading
|
||
of libthread_db would fail because of ps_lgetLDT being undefined. */
|
||
|
||
ps_err_e
|
||
ps_lgetLDT (gdb_ps_prochandle_t ph, lwpid_t lwpid,
|
||
struct ssd *pldt)
|
||
{
|
||
/* NOTE: only used on Solaris, therefore OK to refer to procfs.c. */
|
||
struct ssd *ret;
|
||
|
||
/* FIXME: can't I get the process ID from the prochandle or
|
||
something? */
|
||
|
||
if (ptid_get_pid (inferior_ptid) <= 0 || lwpid <= 0)
|
||
return PS_BADLID;
|
||
|
||
ret = procfs_find_LDT_entry (ptid_build (ptid_get_pid (inferior_ptid),
|
||
lwpid, 0));
|
||
if (ret)
|
||
{
|
||
memcpy (pldt, ret, sizeof (struct ssd));
|
||
return PS_OK;
|
||
}
|
||
else
|
||
/* LDT not found. */
|
||
return PS_ERR;
|
||
}
|
||
#endif
|
||
|
||
|
||
/* Convert PTID to printable form. */
|
||
|
||
static char *
|
||
solaris_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
||
{
|
||
static char buf[100];
|
||
|
||
if (ptid_tid_p (ptid))
|
||
{
|
||
ptid_t lwp;
|
||
|
||
lwp = thread_to_lwp (ptid, -2);
|
||
|
||
if (ptid_get_pid (lwp) == -1)
|
||
xsnprintf (buf, sizeof (buf), "Thread %ld (defunct)",
|
||
ptid_get_tid (ptid));
|
||
else if (ptid_get_pid (lwp) != -2)
|
||
xsnprintf (buf, sizeof (buf), "Thread %ld (LWP %ld)",
|
||
ptid_get_tid (ptid), ptid_get_lwp (lwp));
|
||
else
|
||
xsnprintf (buf, sizeof (buf), "Thread %ld ",
|
||
ptid_get_tid (ptid));
|
||
}
|
||
else if (ptid_get_lwp (ptid) != 0)
|
||
xsnprintf (buf, sizeof (buf), "LWP %ld ", ptid_get_lwp (ptid));
|
||
else
|
||
xsnprintf (buf, sizeof (buf), "process %d ", ptid_get_pid (ptid));
|
||
|
||
return buf;
|
||
}
|
||
|
||
|
||
/* Worker bee for update_thread_list. Callback function that gets
|
||
called once per user-level thread (i.e. not for LWP's). */
|
||
|
||
static int
|
||
sol_update_thread_list_callback (const td_thrhandle_t *th, void *ignored)
|
||
{
|
||
td_err_e retval;
|
||
td_thrinfo_t ti;
|
||
ptid_t ptid;
|
||
|
||
retval = p_td_thr_get_info (th, &ti);
|
||
if (retval != TD_OK)
|
||
return -1;
|
||
|
||
ptid = ptid_build (ptid_get_pid (inferior_ptid), 0, ti.ti_tid);
|
||
if (!in_thread_list (ptid) || is_exited (ptid))
|
||
add_thread (ptid);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
sol_update_thread_list (struct target_ops *ops)
|
||
{
|
||
struct target_ops *beneath = find_target_beneath (ops);
|
||
|
||
/* Delete dead threads. */
|
||
prune_threads ();
|
||
|
||
/* Find any new LWP's. */
|
||
beneath->to_update_thread_list (beneath);
|
||
|
||
/* Then find any new user-level threads. */
|
||
p_td_ta_thr_iter (main_ta, sol_update_thread_list_callback, (void *) 0,
|
||
TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
|
||
TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
|
||
}
|
||
|
||
/* Worker bee for the "info sol-thread" command. This is a callback
|
||
function that gets called once for each Solaris user-level thread
|
||
(i.e. not for LWPs) in the inferior. Print anything interesting
|
||
that we can think of. */
|
||
|
||
static int
|
||
info_cb (const td_thrhandle_t *th, void *s)
|
||
{
|
||
td_err_e ret;
|
||
td_thrinfo_t ti;
|
||
|
||
ret = p_td_thr_get_info (th, &ti);
|
||
if (ret == TD_OK)
|
||
{
|
||
printf_filtered ("%s thread #%d, lwp %d, ",
|
||
ti.ti_type == TD_THR_SYSTEM ? "system" : "user ",
|
||
ti.ti_tid, ti.ti_lid);
|
||
switch (ti.ti_state)
|
||
{
|
||
default:
|
||
case TD_THR_UNKNOWN:
|
||
printf_filtered ("<unknown state>");
|
||
break;
|
||
case TD_THR_STOPPED:
|
||
printf_filtered ("(stopped)");
|
||
break;
|
||
case TD_THR_RUN:
|
||
printf_filtered ("(run) ");
|
||
break;
|
||
case TD_THR_ACTIVE:
|
||
printf_filtered ("(active) ");
|
||
break;
|
||
case TD_THR_ZOMBIE:
|
||
printf_filtered ("(zombie) ");
|
||
break;
|
||
case TD_THR_SLEEP:
|
||
printf_filtered ("(asleep) ");
|
||
break;
|
||
case TD_THR_STOPPED_ASLEEP:
|
||
printf_filtered ("(stopped asleep)");
|
||
break;
|
||
}
|
||
/* Print thr_create start function. */
|
||
if (ti.ti_startfunc != 0)
|
||
{
|
||
const struct bound_minimal_symbol msym
|
||
= lookup_minimal_symbol_by_pc (ti.ti_startfunc);
|
||
|
||
printf_filtered (" startfunc=%s",
|
||
msym.minsym
|
||
? MSYMBOL_PRINT_NAME (msym.minsym)
|
||
: paddress (target_gdbarch (), ti.ti_startfunc));
|
||
}
|
||
|
||
/* If thread is asleep, print function that went to sleep. */
|
||
if (ti.ti_state == TD_THR_SLEEP)
|
||
{
|
||
const struct bound_minimal_symbol msym
|
||
= lookup_minimal_symbol_by_pc (ti.ti_pc);
|
||
|
||
printf_filtered (" sleepfunc=%s",
|
||
msym.minsym
|
||
? MSYMBOL_PRINT_NAME (msym.minsym)
|
||
: paddress (target_gdbarch (), ti.ti_pc));
|
||
}
|
||
|
||
printf_filtered ("\n");
|
||
}
|
||
else
|
||
warning (_("info sol-thread: failed to get info for thread."));
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* List some state about each Solaris user-level thread in the
|
||
inferior. */
|
||
|
||
static void
|
||
info_solthreads (char *args, int from_tty)
|
||
{
|
||
p_td_ta_thr_iter (main_ta, info_cb, args,
|
||
TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
|
||
TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
|
||
}
|
||
|
||
/* Callback routine used to find a thread based on the TID part of
|
||
its PTID. */
|
||
|
||
static int
|
||
thread_db_find_thread_from_tid (struct thread_info *thread, void *data)
|
||
{
|
||
long *tid = (long *) data;
|
||
|
||
if (ptid_get_tid (thread->ptid) == *tid)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static ptid_t
|
||
sol_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
|
||
{
|
||
struct thread_info *thread_info =
|
||
iterate_over_threads (thread_db_find_thread_from_tid, &thread);
|
||
|
||
if (thread_info == NULL)
|
||
{
|
||
/* The list of threads is probably not up to date. Find any
|
||
thread that is missing from the list, and try again. */
|
||
sol_update_thread_list (¤t_target);
|
||
thread_info = iterate_over_threads (thread_db_find_thread_from_tid,
|
||
&thread);
|
||
}
|
||
|
||
gdb_assert (thread_info != NULL);
|
||
|
||
return (thread_info->ptid);
|
||
}
|
||
|
||
static void
|
||
init_sol_thread_ops (void)
|
||
{
|
||
sol_thread_ops.to_shortname = "solaris-threads";
|
||
sol_thread_ops.to_longname = "Solaris threads and pthread.";
|
||
sol_thread_ops.to_doc = "Solaris threads and pthread support.";
|
||
sol_thread_ops.to_detach = sol_thread_detach;
|
||
sol_thread_ops.to_resume = sol_thread_resume;
|
||
sol_thread_ops.to_wait = sol_thread_wait;
|
||
sol_thread_ops.to_fetch_registers = sol_thread_fetch_registers;
|
||
sol_thread_ops.to_store_registers = sol_thread_store_registers;
|
||
sol_thread_ops.to_xfer_partial = sol_thread_xfer_partial;
|
||
sol_thread_ops.to_mourn_inferior = sol_thread_mourn_inferior;
|
||
sol_thread_ops.to_thread_alive = sol_thread_alive;
|
||
sol_thread_ops.to_pid_to_str = solaris_pid_to_str;
|
||
sol_thread_ops.to_update_thread_list = sol_update_thread_list;
|
||
sol_thread_ops.to_stratum = thread_stratum;
|
||
sol_thread_ops.to_get_ada_task_ptid = sol_get_ada_task_ptid;
|
||
sol_thread_ops.to_magic = OPS_MAGIC;
|
||
}
|
||
|
||
/* Silence -Wmissing-prototypes. */
|
||
extern void _initialize_sol_thread (void);
|
||
|
||
void
|
||
_initialize_sol_thread (void)
|
||
{
|
||
void *dlhandle;
|
||
|
||
init_sol_thread_ops ();
|
||
|
||
dlhandle = dlopen ("libthread_db.so.1", RTLD_NOW);
|
||
if (!dlhandle)
|
||
goto die;
|
||
|
||
#define resolve(X) \
|
||
if (!(p_##X = dlsym (dlhandle, #X))) \
|
||
goto die;
|
||
|
||
resolve (td_log);
|
||
resolve (td_ta_new);
|
||
resolve (td_ta_delete);
|
||
resolve (td_init);
|
||
resolve (td_ta_get_ph);
|
||
resolve (td_ta_get_nthreads);
|
||
resolve (td_ta_tsd_iter);
|
||
resolve (td_ta_thr_iter);
|
||
resolve (td_thr_validate);
|
||
resolve (td_thr_tsd);
|
||
resolve (td_thr_get_info);
|
||
resolve (td_thr_getfpregs);
|
||
resolve (td_thr_getxregsize);
|
||
resolve (td_thr_getxregs);
|
||
resolve (td_thr_sigsetmask);
|
||
resolve (td_thr_setprio);
|
||
resolve (td_thr_setsigpending);
|
||
resolve (td_thr_setfpregs);
|
||
resolve (td_thr_setxregs);
|
||
resolve (td_ta_map_id2thr);
|
||
resolve (td_ta_map_lwp2thr);
|
||
resolve (td_thr_getgregs);
|
||
resolve (td_thr_setgregs);
|
||
|
||
complete_target_initialization (&sol_thread_ops);
|
||
|
||
add_cmd ("sol-threads", class_maintenance, info_solthreads,
|
||
_("Show info on Solaris user threads."), &maintenanceinfolist);
|
||
|
||
/* Hook into new_objfile notification. */
|
||
observer_attach_new_objfile (sol_thread_new_objfile);
|
||
return;
|
||
|
||
die:
|
||
fprintf_unfiltered (gdb_stderr, "\
|
||
[GDB will not be able to debug user-mode threads: %s]\n", dlerror ());
|
||
|
||
if (dlhandle)
|
||
dlclose (dlhandle);
|
||
|
||
return;
|
||
}
|