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* config/i386/nm-linux.h (PREPARE_TO_PROCEED, ATTCH_LWP,

Browse Source 
GET_THREAD_SIGNALS): New defines.
* config/i386/linux.mh (NATDEPFILES): Remove lin-thread.o and
linux-threads.o.  Add proc-service.o, thread-db.o and lin-lwp.o.
* proc-service.c: New file.
* thread-db.c: New file.
* lin-lwp.c: New file.
This commit is contained in:
Mark Kettenis 2000-09-03 18:41:28 +00:00
parent 205b2e5054
commit fb0e1ba780
6 changed files with 2400 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gdb/ChangeLog
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@ -1,5 +1,13 @@
2000-09-03 Mark Kettenis <kettenis@gnu.org>
* config/i386/nm-linux.h (PREPARE_TO_PROCEED, ATTCH_LWP,
GET_THREAD_SIGNALS): New defines.
* config/i386/linux.mh (NATDEPFILES): Remove lin-thread.o and
linux-threads.o. Add proc-service.o, thread-db.o and lin-lwp.o.
* proc-service.c: New file.
* thread-db.c: New file.
* lin-lwp.c: New file.
* gdb_assert.h: New file.
* gdb_thread_db.h [HAVE_THREAD_DB_H]: Include <thread_db.h>.

4
gdb/config/i386/linux.mh
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@ -5,7 +5,7 @@ XDEPFILES=
NAT_FILE= nm-linux.h
NATDEPFILES= infptrace.o solib.o inftarg.o fork-child.o corelow.o \
core-aout.o i386v-nat.o i386-linux-nat.o linux-thread.o lin-thread.o \
i387-nat.o
core-aout.o i386v-nat.o i386-linux-nat.o i387-nat.o \
proc-service.o thread-db.o lin-lwp.o
LOADLIBES = -ldl -rdynamic

20
gdb/config/i386/nm-linux.h
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@ -1,5 +1,5 @@
/* Native support for GNU/Linux, for GDB, the GNU debugger.
Copyright (C) 1986, 1987, 1989, 1992, 1996, 1998, 2000
/* Native support for Linux/x86.
Copyright 1986, 1987, 1989, 1992, 1996, 1998, 2000
Free Software Foundation, Inc.
This file is part of GDB.
@ -79,4 +79,18 @@ extern CORE_ADDR i386_stopped_by_watchpoint (int);
extern int i386_insert_watchpoint (int pid, CORE_ADDR addr, int len, int rw);
extern int i386_remove_watchpoint (int pid, CORE_ADDR addr, int len);
#endif /* #ifndef NM_LINUX_H */
/* FIXME: kettenis/2000-09-03: This should be moved to ../nm-linux.h
once we have converted all Linux targets to use the new threads
stuff (without the #undef of course). */
extern int lin_lwp_prepare_to_proceed (void);
#undef PREPARE_TO_PROCEED
#define PREPARE_TO_PROCEED(select_it) lin_lwp_prepare_to_proceed ()
extern void lin_lwp_attach_lwp (int pid, int verbose);
#define ATTACH_LWP(pid, verbose) lin_lwp_attach_lwp ((pid), (verbose))
extern void lin_thread_get_thread_signals (sigset_t *mask);
#define GET_THREAD_SIGNALS(mask) lin_thread_get_thread_signals (mask)
#endif /* nm_linux.h */

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gdb/lin-lwp.c Normal file
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gdb/proc-service.c Normal file
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/* <proc_service.h> implementation.
Copyright 1999, 2000 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "gdb_proc_service.h"
#include <sys/procfs.h>
#include "inferior.h"
#include "symtab.h"
#include "target.h"
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
/* Fix-up some broken systems. */
/* The prototypes in <proc_service.h> are slightly different on older
systems. Compensate for the discrepancies. */
#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;
#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;
#endif
/* Building process ids. */
#ifndef MERGEPID
#define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16))
#endif
#define BUILD_LWP(tid, pid) MERGEPID (pid, tid)
/* Helper functions. */
static void
restore_inferior_pid (void *arg)
{
int *saved_pid_ptr = arg;
inferior_pid = *saved_pid_ptr;
free (arg);
}
static struct cleanup *
save_inferior_pid (void)
{
int *saved_pid_ptr;
saved_pid_ptr = xmalloc (sizeof (int));
*saved_pid_ptr = inferior_pid;
return make_cleanup (restore_inferior_pid, saved_pid_ptr);
}
/* Transfer LEN bytes of memory between BUF and address ADDR in the
process specified by PH. If WRITE, transfer them to the process,
else transfer them from the process. Returns PS_OK for success,
PS_ERR on failure.
This is a helper function for ps_pdread, ps_pdwrite, ps_ptread and
ps_ptwrite. */
static ps_err_e
ps_xfer_memory (const struct ps_prochandle *ph, paddr_t addr,
char *buf, size_t len, int write)
{
struct cleanup *old_chain = save_inferior_pid ();
int ret;
inferior_pid = ph->pid;
if (write)
ret = target_write_memory (addr, buf, len);
else
ret = target_read_memory (addr, buf, len);
do_cleanups (old_chain);
return (ret == 0 ? PS_OK : PS_ERR);
}
/* Stop the target process PH. */
ps_err_e
ps_pstop (gdb_ps_prochandle_t ph)
{
/* The process is always stopped when under control of GDB. */
return PS_OK;
}
/* Resume the target process PH. */
ps_err_e
ps_pcontinue (gdb_ps_prochandle_t ph)
{
/* Pretend we did successfully continue the process. GDB will take
care of it later on. */
return PS_OK;
}
/* Stop the lightweight process LWPID within the target process PH. */
ps_err_e
ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)
{
/* All lightweight processes are stopped when under control of GDB. */
return PS_OK;
}
/* Resume the lightweight process (LWP) LWPID within the target
process PH. */
ps_err_e
ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)
{
/* Pretend we did successfully continue LWPID. GDB will take care
of it later on. */
return PS_OK;
}
/* Get the size of the architecture-dependent extra state registers
for LWP LWPID within the target process PH and return it in
*XREGSIZE. */
ps_err_e
ps_lgetxregsize (gdb_ps_prochandle_t ph, lwpid_t lwpid, int *xregsize)
{
/* FIXME: Not supported yet. */
return PS_OK;
}
/* Get the extra state registers of LWP LWPID within the target
process PH and store them in XREGSET. */
ps_err_e
ps_lgetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
{
/* FIXME: Not supported yet. */
return PS_OK;
}
/* Set the extra state registers of LWP LWPID within the target
process PH from XREGSET. */
ps_err_e
ps_lsetxregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, caddr_t xregset)
{
/* FIXME: Not supported yet. */
return PS_OK;
}
/* Log (additional) diognostic information. */
void
ps_plog (const char *fmt, ...)
{
va_list args;
va_start (args, fmt);
vfprintf_filtered (gdb_stderr, fmt, args);
}
/* Search for the symbol named NAME within the object named OBJ within
the target process PH. If the symbol is found the address of the
symbol is stored in SYM_ADDR. */
ps_err_e
ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *obj,
const char *name, paddr_t *sym_addr)
{
struct minimal_symbol *ms;
/* FIXME: kettenis/2000-09-03: What should we do with OBJ? */
ms = lookup_minimal_symbol (name, NULL, NULL);
if (ms == NULL)
return PS_NOSYM;
*sym_addr = SYMBOL_VALUE_ADDRESS (ms);
return PS_OK;
}
/* Read SIZE bytes from the target process PH at address ADDR and copy
them into BUF. */
ps_err_e
ps_pdread (gdb_ps_prochandle_t ph, paddr_t addr,
gdb_ps_read_buf_t buf, gdb_ps_size_t size)
{
return ps_xfer_memory (ph, addr, buf, size, 0);
}
/* Write SIZE bytes from BUF into the target process PH at address ADDR. */
ps_err_e
ps_pdwrite (gdb_ps_prochandle_t ph, paddr_t addr,
gdb_ps_write_buf_t buf, gdb_ps_size_t size)
{
return ps_xfer_memory (ph, addr, (char *) buf, size, 1);
}
/* Read SIZE bytes from the target process PH at address ADDR and copy
them into BUF. */
ps_err_e
ps_ptread (gdb_ps_prochandle_t ph, paddr_t addr,
gdb_ps_read_buf_t buf, gdb_ps_size_t size)
{
return ps_xfer_memory (ph, addr, buf, size, 0);
}
/* Write SIZE bytes from BUF into the target process PH at address ADDR. */
ps_err_e
ps_ptwrite (gdb_ps_prochandle_t ph, paddr_t addr,
gdb_ps_write_buf_t buf, gdb_ps_size_t size)
{
return ps_xfer_memory (ph, addr, (char *) buf, size, 1);
}
/* Get the general registers of LWP LWPID within the target process PH
and store them in GREGSET. */
ps_err_e
ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, prgregset_t gregset)
{
struct cleanup *old_chain = save_inferior_pid ();
inferior_pid = BUILD_LWP (lwpid, ph->pid);
target_fetch_registers (-1);
fill_gregset ((gdb_gregset_t *) gregset, -1);
do_cleanups (old_chain);
return PS_OK;
}
/* Set the general registers of LWP LWPID within the target process PH
from GREGSET. */
ps_err_e
ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid, const prgregset_t gregset)
{
struct cleanup *old_chain = save_inferior_pid ();
inferior_pid = BUILD_LWP (lwpid, ph->pid);
/* FIXME: We should really make supply_gregset const-correct. */
supply_gregset ((gdb_gregset_t *) gregset);
target_store_registers (-1);
do_cleanups (old_chain);
return PS_OK;
}
/* Get the floating-point registers of LWP LWPID within the target
process PH and store them in FPREGSET. */
ps_err_e
ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
gdb_prfpregset_t *fpregset)
{
struct cleanup *old_chain = save_inferior_pid ();
inferior_pid = BUILD_LWP (lwpid, ph->pid);
target_fetch_registers (-1);
fill_fpregset ((gdb_fpregset_t *) fpregset, -1);
do_cleanups (old_chain);
return PS_OK;
}
/* Set the floating-point registers of LWP LWPID within the target
process PH from FPREGSET. */
ps_err_e
ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
const gdb_prfpregset_t *fpregset)
{
struct cleanup *old_chain = save_inferior_pid ();
inferior_pid = BUILD_LWP (lwpid, ph->pid);
/* FIXME: We should really make supply_fpregset const-correct. */
supply_fpregset ((gdb_fpregset_t *) fpregset);
target_store_registers (-1);
do_cleanups (old_chain);
return PS_OK;
}
/* Return overall process id of the target PH.
Special for Linux -- not used on Solaris. */
pid_t
ps_getpid (gdb_ps_prochandle_t ph)
{
return ph->pid;
}
void
_initialize_proc_service (void)
{
/* This function solely exists to make sure this module is linked
into the final binary. */
}

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@ -0,0 +1,992 @@
/* libthread_db assisted debugging support, generic parts.
Copyright 1999, 2000 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "gdb_assert.h"
#include <dlfcn.h>
#include "gdb_proc_service.h"
#include "gdb_thread_db.h"
#include "gdbthread.h"
#include "inferior.h"
#include "target.h"
#ifndef LIBTHREAD_DB_SO
#define LIBTHREAD_DB_SO "libthread_db.so.1"
#endif
/* If we're running on Linux, we must explicitly attach to any new threads. */
/* FIXME: There is certainly some room for improvements:
- Cache LWP ids.
- Bypass libthread_db when fetching or storing registers for
threads bound to a LWP. */
/* This module's target vector. */
static struct target_ops thread_db_ops;
/* The target vector that we call for things this module can't handle. */
static struct target_ops *target_beneath;
/* Pointer to the next function on the objfile event chain. */
static void (*target_new_objfile_chain) (struct objfile *objfile);
/* Non-zero if we're using this module's target vector. */
static int using_thread_db;
/* Non-zero if we have determined the signals used by the threads
library. */
static int thread_signals;
static sigset_t thread_stop_set;
static sigset_t thread_print_set;
/* Structure that identifies the child process for the
<proc_service.h> interface. */
static struct ps_prochandle proc_handle;
/* Connection to the libthread_db library. */
static td_thragent_t *thread_agent;
/* Pointers to the libthread_db functions. */
static td_err_e (*td_init_p) (void);
static td_err_e (*td_ta_new_p) (struct ps_prochandle *ps, td_thragent_t **ta);
static td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
td_thrhandle_t *__th);
static td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta, lwpid_t lwpid,
td_thrhandle_t *th);
static td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
td_thr_iter_f *callback,
void *cbdata_p, td_thr_state_e state,
int ti_pri, sigset_t *ti_sigmask_p,
unsigned int ti_user_flags);
static td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
td_event_e event, td_notify_t *ptr);
static td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
td_thr_events_t *event);
static td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
td_event_msg_t *msg);
static td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
static td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
td_thrinfo_t *infop);
static td_err_e (*td_thr_getfpregs_p) (const td_thrhandle_t *th,
gdb_prfpregset_t *regset);
static td_err_e (*td_thr_getgregs_p) (const td_thrhandle_t *th,
prgregset_t gregs);
static td_err_e (*td_thr_setfpregs_p) (const td_thrhandle_t *th,
const gdb_prfpregset_t *fpregs);
static td_err_e (*td_thr_setgregs_p) (const td_thrhandle_t *th,
prgregset_t gregs);
static td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th, int event);
/* Location of the thread creation event breakpoint. The code at this
location in the child process will be called by the pthread library
whenever a new thread is created. By setting a special breakpoint
at this location, GDB can detect when a new thread is created. We
obtain this location via the td_ta_event_addr call. */
static CORE_ADDR td_create_bp_addr;
/* Location of the thread death event breakpoint. */
static CORE_ADDR td_death_bp_addr;
/* Prototypes for local functions. */
static int find_new_threads_callback (const td_thrhandle_t *th_p, void *data);
/* Building process ids. */
#ifndef TIDGET
#define TIDGET(PID) (((PID) & 0x7fffffff) >> 16)
#define PIDGET(PID) (((PID) & 0xffff))
#define MERGEPID(PID, TID) (((PID) & 0xffff) | ((TID) << 16))
#endif
#define THREAD_FLAG 0x80000000
#define is_lwp(pid) (((pid) & THREAD_FLAG) == 0 && TIDGET (pid))
#define is_thread(pid) ((pid) & THREAD_FLAG)
#define GET_PID(pid) PIDGET (pid)
#define GET_LWP(pid) TIDGET (pid)
#define GET_THREAD(pid) TIDGET (pid)
#define BUILD_LWP(tid, pid) MERGEPID (pid, tid)
#define BUILD_THREAD(tid, pid) (MERGEPID (pid, tid) | THREAD_FLAG)
struct private_thread_info
{
/* Cached LWP id. Must come first, see lin-lwp.c. */
lwpid_t lwpid;
};
/* Helper functions. */
static void
restore_inferior_pid (void *arg)
{
int *saved_pid_ptr = arg;
inferior_pid = *saved_pid_ptr;
free (arg);
}
static struct cleanup *
save_inferior_pid (void)
{
int *saved_pid_ptr;
saved_pid_ptr = xmalloc (sizeof (int));
*saved_pid_ptr = inferior_pid;
return make_cleanup (restore_inferior_pid, saved_pid_ptr);
}
static char *
thread_db_err_str (td_err_e err)
{
static char buf[64];
switch (err)
{
case TD_OK:
return "generic 'call succeeded'";
case TD_ERR:
return "generic error";
case TD_NOTHR:
return "no thread to satisfy query";
case TD_NOSV:
return "no sync handle to satisfy query";
case TD_NOLWP:
return "no LWP to satisfy query";
case TD_BADPH:
return "invalid process handle";
case TD_BADTH:
return "invalid thread handle";
case TD_BADSH:
return "invalid synchronization handle";
case TD_BADTA:
return "invalid thread agent";
case TD_BADKEY:
return "invalid key";
case TD_NOMSG:
return "no event message for getmsg";
case TD_NOFPREGS:
return "FPU register set not available";
case TD_NOLIBTHREAD:
return "application not linked with libthread";
case TD_NOEVENT:
return "requested event is not supported";
case TD_NOCAPAB:
return "capability not available";
case TD_DBERR:
return "debugger service failed";
case TD_NOAPLIC:
return "operation not applicable to";
case TD_NOTSD:
return "no thread-specific data for this thread";
case TD_MALLOC:
return "malloc failed";
case TD_PARTIALREG:
return "only part of register set was written/read";
case TD_NOXREGS:
return "X register set not available for this thread";
default:
snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
return buf;
}
}
static char *
thread_db_state_str (td_thr_state_e state)
{
static char buf[64];
switch (state)
{
case TD_THR_STOPPED:
return "stopped by debugger";
case TD_THR_RUN:
return "runnable";
case TD_THR_ACTIVE:
return "active";
case TD_THR_ZOMBIE:
return "zombie";
case TD_THR_SLEEP:
return "sleeping";
case TD_THR_STOPPED_ASLEEP:
return "stopped by debugger AND blocked";
default:
snprintf (buf, sizeof (buf), "unknown thread_db state %d", state);
return buf;
}
}
/* Convert between user-level thread ids and LWP ids. */
static int
thread_from_lwp (int pid)
{
td_thrinfo_t ti;
td_thrhandle_t th;
td_err_e err;
if (GET_LWP (pid) == 0)
pid = BUILD_LWP (pid, pid);
gdb_assert (is_lwp (pid));
err = td_ta_map_lwp2thr_p (thread_agent, GET_LWP (pid), &th);
if (err != TD_OK)
error ("Cannot find user-level thread for LWP %d: %s",
GET_LWP (pid), thread_db_err_str (err));
err = td_thr_get_info_p (&th, &ti);
if (err != TD_OK)
error ("Cannot get thread info: %s", thread_db_err_str (err));
return BUILD_THREAD (ti.ti_tid, GET_PID (pid));
}
static int
lwp_from_thread (int pid)
{
td_thrinfo_t ti;
td_thrhandle_t th;
td_err_e err;
if (! is_thread (pid))
return pid;
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th);
if (err != TD_OK)
error ("Cannot find thread %ld: %s",
(long) GET_THREAD (pid), thread_db_err_str (err));
err = td_thr_get_info_p (&th, &ti);
if (err != TD_OK)
error ("Cannot get thread info: %s", thread_db_err_str (err));
return BUILD_LWP (ti.ti_lid, GET_PID (pid));
}
void
thread_db_init (struct target_ops *target)
{
target_beneath = target;
}
static int
thread_db_load (void)
{
void *handle;
td_err_e err;
handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
if (handle == NULL)
return 0;
/* Initialize pointers to the dynamic library functions we will use.
Essential functions first. */
td_init_p = dlsym (handle, "td_init");
if (td_init_p == NULL)
return 0;
td_ta_new_p = dlsym (handle, "td_ta_new");
if (td_ta_new_p == NULL)
return 0;
td_ta_map_id2thr_p = dlsym (handle, "td_ta_map_id2thr");
if (td_ta_map_id2thr_p == NULL)
return 0;
td_ta_map_lwp2thr_p = dlsym (handle, "td_ta_map_lwp2thr");
if (td_ta_map_lwp2thr_p == NULL)
return 0;
td_ta_thr_iter_p = dlsym (handle, "td_ta_thr_iter");
if (td_ta_thr_iter_p == NULL)
return 0;
td_thr_validate_p = dlsym (handle, "td_thr_validate");
if (td_thr_validate_p == NULL)
return 0;
td_thr_get_info_p = dlsym (handle, "td_thr_get_info");
if (td_thr_get_info_p == NULL)
return 0;
td_thr_getfpregs_p = dlsym (handle, "td_thr_getfpregs");
if (td_thr_getfpregs_p == NULL)
return 0;
td_thr_getgregs_p = dlsym (handle, "td_thr_getgregs");
if (td_thr_getgregs_p == NULL)
return 0;
td_thr_setfpregs_p = dlsym (handle, "td_thr_setfpregs");
if (td_thr_setfpregs_p == NULL)
return 0;
td_thr_setgregs_p = dlsym (handle, "td_thr_setgregs");
if (td_thr_setgregs_p == NULL)
return 0;
/* Initialize the library. */
err = td_init_p ();
if (err != TD_OK)
{
warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err));
return 0;
}
/* These are not essential. */
td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr");
td_ta_set_event_p = dlsym (handle, "td_ta_set_event");
td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg");
td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable");
return 1;
}
static void
enable_thread_event_reporting (void)
{
td_thr_events_t events;
td_notify_t notify;
td_err_e err;
/* We cannot use the thread event reporting facility if these
functions aren't available. */
if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL
|| td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL)
return;
/* Set the process wide mask saying which events we're interested in. */
td_event_emptyset (&events);
td_event_addset (&events, TD_CREATE);
#if 0
/* FIXME: kettenis/2000-04-23: The event reporting facility is
broken for TD_DEATH events in glibc 2.1.3, so don't enable it for
now. */
td_event_addset (&events, TD_DEATH);
#endif
err = td_ta_set_event_p (thread_agent, &events);
if (err != TD_OK)
{
warning ("Unable to set global thread event mask: %s",
thread_db_err_str (err));
return;
}
/* Delete previous thread event breakpoints, if any. */
remove_thread_event_breakpoints ();
/* Get address for thread creation breakpoint. */
err = td_ta_event_addr_p (thread_agent, TD_CREATE, &notify);
if (err != TD_OK)
{
warning ("Unable to get location for thread creation breakpoint: %s",
thread_db_err_str (err));
return;
}
/* Set up the breakpoint. */
td_create_bp_addr = (CORE_ADDR) notify.u.bptaddr;
create_thread_event_breakpoint (td_create_bp_addr);
/* Get address for thread death breakpoint. */
err = td_ta_event_addr_p (thread_agent, TD_DEATH, &notify);
if (err != TD_OK)
{
warning ("Unable to get location for thread creation breakpoint: %s",
thread_db_err_str (err));
return;
}
/* Set up the breakpoint. */
td_death_bp_addr = (CORE_ADDR) notify.u.bptaddr;
create_thread_event_breakpoint (td_death_bp_addr);
}
static void
disable_thread_event_reporting (void)
{
td_thr_events_t events;
/* Set the process wide mask saying we aren't interested in any
events anymore. */
td_event_emptyset (&events);
td_ta_set_event_p (thread_agent, &events);
/* Delete thread event breakpoints, if any. */
remove_thread_event_breakpoints ();
td_create_bp_addr = 0;
td_death_bp_addr = 0;
}
static void
check_thread_signals (void)
{
#ifdef GET_THREAD_SIGNALS
if (! thread_signals)
{
sigset_t mask;
int i;
GET_THREAD_SIGNALS (&mask);
sigemptyset (&thread_stop_set);
sigemptyset (&thread_print_set);
for (i = 0; i < NSIG; i++)
{
if (sigismember (&mask, i))
{
if (signal_stop_update (target_signal_from_host (i), 0))
sigaddset (&thread_stop_set, i);
if (signal_print_update (target_signal_from_host (i), 0))
sigaddset (&thread_print_set, i);
thread_signals = 1;
}
}
}
#endif
}
static void
disable_thread_signals (void)
{
#ifdef GET_THREAD_SIGNALS
if (thread_signals)
{
int i;
for (i = 0; i < NSIG; i++)
{
if (sigismember (&thread_stop_set, i))
signal_stop_update (target_signal_from_host (i), 1);
if (sigismember (&thread_print_set, i))
signal_print_update (target_signal_from_host (i), 1);
}
thread_signals = 0;
}
#endif
}
static void
thread_db_push_target (void)
{
using_thread_db = 1;
/* Push this target vector. */
push_target (&thread_db_ops);
enable_thread_event_reporting ();
}
static void
thread_db_unpush_target (void)
{
/* Unpush this target vector. */
unpush_target (&thread_db_ops);
using_thread_db = 0;
}
static void
thread_db_new_objfile (struct objfile *objfile)
{
td_err_e err;
if (using_thread_db)
/* Nothing to do. The thread library was already detected and the
target vector was already activated. */
goto quit;
if (objfile == NULL)
/* Un-interesting object file. */
goto quit;
/* Initialize the structure that identifies the child process. */
proc_handle.pid = GET_PID (inferior_pid);
/* Now attempt to open a connection to the thread library running in
the child process. */
err = td_ta_new_p (&proc_handle, &thread_agent);
switch (err)
{
case TD_NOLIBTHREAD:
/* No thread library found in the child process, probably
because the child process isn't running yet. */
break;
case TD_OK:
/* The thread library was detected in the child; we go live now! */
thread_db_push_target ();
/* Find all user-space threads. */
err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback,
&inferior_pid, TD_THR_ANY_STATE,
TD_THR_LOWEST_PRIORITY, TD_SIGNO_MASK,
TD_THR_ANY_USER_FLAGS);
if (err != TD_OK)
error ("Finding new threads failed: %s", thread_db_err_str (err));
break;
default:
warning ("Cannot initialize thread debugging library: %s",
thread_db_err_str (err));
break;
}
quit:
if (target_new_objfile_chain)
target_new_objfile_chain (objfile);
}
static void
attach_thread (int pid, const td_thrhandle_t *th_p,
const td_thrinfo_t *ti_p, int verbose)
{
struct thread_info *tp;
td_err_e err;
check_thread_signals ();
if (verbose)
printf_unfiltered ("[New %s]\n", target_pid_to_str (pid));
/* Add the thread to GDB's thread list. */
tp = add_thread (pid);
tp->private = xmalloc (sizeof (struct private_thread_info));
tp->private->lwpid = ti_p->ti_lid;
/* Under Linux, we have to attach to each and every thread. */
#ifdef ATTACH_LWP
if (ti_p->ti_lid != GET_PID (pid))
ATTACH_LWP (BUILD_LWP (ti_p->ti_lid, GET_PID (pid)), 0);
#endif
/* Enable thread event reporting for this thread. */
err = td_thr_event_enable_p (th_p, 1);
if (err != TD_OK)
error ("Cannot enable thread event reporting for %s: %s",
target_pid_to_str (pid), thread_db_err_str (err));
}
static void
detach_thread (int pid, int verbose)
{
if (verbose)
printf_unfiltered ("[%s exited]\n", target_pid_to_str (pid));
}
static void
thread_db_detach (char *args, int from_tty)
{
disable_thread_event_reporting ();
thread_db_unpush_target ();
target_beneath->to_detach (args, from_tty);
}
static void
thread_db_resume (int pid, int step, enum target_signal signo)
{
struct cleanup *old_chain = save_inferior_pid ();
if (pid == -1)
inferior_pid = lwp_from_thread (inferior_pid);
else if (is_thread (pid))
pid = lwp_from_thread (pid);
target_beneath->to_resume (pid, step, signo);
do_cleanups (old_chain);
}
/* Check if PID is currently stopped at the location of a thread event
breakpoint location. If it is, read the event message and act upon
the event. */
static void
check_event (int pid)
{
td_event_msg_t msg;
td_thrinfo_t ti;
td_err_e err;
CORE_ADDR stop_pc;
/* Bail out early if we're not at a thread event breakpoint. */
stop_pc = read_pc_pid (pid) - DECR_PC_AFTER_BREAK;
if (stop_pc != td_create_bp_addr && stop_pc != td_death_bp_addr)
return;
err = td_ta_event_getmsg_p (thread_agent, &msg);
if (err != TD_OK)
{
if (err == TD_NOMSG)
return;
error ("Cannot get thread event message: %s", thread_db_err_str (err));
}
err = td_thr_get_info_p (msg.th_p, &ti);
if (err != TD_OK)
error ("Cannot get thread info: %s", thread_db_err_str (err));
pid = BUILD_THREAD (ti.ti_tid, GET_PID (pid));
switch (msg.event)
{
case TD_CREATE:
#if 0
/* FIXME: kettenis/2000-08-26: Since we use td_ta_event_getmsg,
there is no guarantee that the breakpoint will match the
event. Should we use td_thr_event_getmsg instead? */
if (stop_pc != td_create_bp_addr)
error ("Thread creation event doesn't match breakpoint.");
#endif
if (in_thread_list (pid))
error ("Spurious thread creation event.");
attach_thread (pid, msg.th_p, &ti, 1);
return;
case TD_DEATH:
#if 0
/* FIXME: See TD_CREATE. */
if (stop_pc != td_death_bp_addr)
error ("Thread death event doesn't match breakpoint.");
#endif
if (! in_thread_list (pid))
error ("Spurious thread death event.");
detach_thread (pid, 1);
return;
default:
error ("Spurious thread event.");
}
}
static int
thread_db_wait (int pid, struct target_waitstatus *ourstatus)
{
extern int trap_pid;
if (pid != -1 && is_thread (pid))
pid = lwp_from_thread (pid);
pid = target_beneath->to_wait (pid, ourstatus);
if (ourstatus->kind == TARGET_WAITKIND_EXITED)
return -1;
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
&& ourstatus->value.sig == TARGET_SIGNAL_TRAP)
/* Check for a thread event. */
check_event (pid);
if (trap_pid)
trap_pid = thread_from_lwp (trap_pid);
return thread_from_lwp (pid);
}
static int
thread_db_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write,
struct target_ops *target)
{
struct cleanup *old_chain = save_inferior_pid ();
int xfer;
if (is_thread (inferior_pid))
{
/* FIXME: This seems to be necessary to make sure breakpoints
are removed. */
if (! target_thread_alive (inferior_pid))
inferior_pid = GET_PID (inferior_pid);
else
inferior_pid = lwp_from_thread (inferior_pid);
}
xfer = target_beneath->to_xfer_memory (memaddr, myaddr, len, write, target);
do_cleanups (old_chain);
return xfer;
}
static void
thread_db_fetch_registers (int regno)
{
td_thrhandle_t th;
prgregset_t gregset;
gdb_prfpregset_t fpregset;
td_err_e err;
if (! is_thread (inferior_pid))
{
/* Pass the request to the target beneath us. */
target_beneath->to_fetch_registers (regno);
return;
}
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th);
if (err != TD_OK)
error ("Cannot find thread %ld: %s",
(long) GET_THREAD (inferior_pid), thread_db_err_str (err));
err = td_thr_getgregs_p (&th, gregset);
if (err != TD_OK)
error ("Cannot fetch general-purpose registers for thread %ld: %s",
(long) GET_THREAD (inferior_pid), thread_db_err_str (err));
err = td_thr_getfpregs_p (&th, &fpregset);
if (err != TD_OK)
error ("Cannot get floating-point registers for thread %ld: %s",
(long) GET_THREAD (inferior_pid), thread_db_err_str (err));
/* Note that we must call supply_gregset after calling the thread_db
routines because the thread_db routines call ps_lgetgregs and
friends which clobber GDB's register cache. */
supply_gregset ((gdb_gregset_t *) gregset);
supply_fpregset (&fpregset);
}
static void
thread_db_store_registers (int regno)
{
td_thrhandle_t th;
prgregset_t gregset;
gdb_prfpregset_t fpregset;
td_err_e err;
if (! is_thread (inferior_pid))
{
/* Pass the request to the target beneath us. */
target_beneath->to_store_registers (regno);
return;
}
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (inferior_pid), &th);
if (err != TD_OK)
error ("Cannot find thread %ld: %s",
(long) GET_THREAD (inferior_pid), thread_db_err_str (err));
if (regno != -1)
{
char raw[MAX_REGISTER_RAW_SIZE];
read_register_gen (regno, raw);
thread_db_fetch_registers (-1);
supply_register (regno, raw);
}
fill_gregset ((gdb_gregset_t *) gregset, -1);
fill_fpregset (&fpregset, -1);
err = td_thr_setgregs_p (&th, gregset);
if (err != TD_OK)
error ("Cannot store general-purpose registers for thread %ld: %s",
(long) GET_THREAD (inferior_pid), thread_db_err_str (err));
err = td_thr_setfpregs_p (&th, &fpregset);
if (err != TD_OK)
error ("Cannot store floating-point registers for thread %ld: %s",
(long) GET_THREAD (inferior_pid), thread_db_err_str (err));
}
static void
thread_db_kill (void)
{
target_beneath->to_kill ();
}
static void
thread_db_create_inferior (char *exec_file, char *allargs, char **env)
{
/* We never want to actually create the inferior! If this is ever
called, it means we were on the target stack when the user said
"run". But we don't want to be on the new inferior's target
stack until the libthread_db connection is ready to be made. So
we unpush ourselves from the stack, and then invoke
find_default_create_inferior, which will invoke the appropriate
process_stratum target to do the create. */
thread_db_unpush_target ();
find_default_create_inferior (exec_file, allargs, env);
}
static void
thread_db_mourn_inferior (void)
{
remove_thread_event_breakpoints ();
thread_db_unpush_target ();
target_beneath->to_mourn_inferior ();
}
static int
thread_db_thread_alive (int pid)
{
if (is_thread (pid))
{
td_thrhandle_t th;
td_err_e err;
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th);
if (err != TD_OK)
return 0;
err = td_thr_validate_p (&th);
if (err != TD_OK)
return 0;
return 1;
}
if (target_beneath->to_thread_alive)
return target_beneath->to_thread_alive (pid);
return 0;
}
static int
find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
{
td_thrinfo_t ti;
td_err_e err;
int pid;
err = td_thr_get_info_p (th_p, &ti);
if (err != TD_OK)
error ("Cannot get thread info: %s", thread_db_err_str (err));
pid = BUILD_THREAD (ti.ti_tid, GET_PID (inferior_pid));
if (! in_thread_list (pid))
attach_thread (pid, th_p, &ti, 1);
return 0;
}
static void
thread_db_find_new_threads (void)
{
td_err_e err;
/* Iterate over all user-space threads to discover new threads. */
err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL,
TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
if (err != TD_OK)
error ("Cannot find new threads: %s", thread_db_err_str (err));
}
static char *
thread_db_pid_to_str (int pid)
{
if (is_thread (pid))
{
static char buf[64];
td_thrhandle_t th;
td_thrinfo_t ti;
td_err_e err;
err = td_ta_map_id2thr_p (thread_agent, GET_THREAD (pid), &th);
if (err != TD_OK)
error ("Cannot find thread %ld: %s",
(long) GET_THREAD (pid), thread_db_err_str (err));
err = td_thr_get_info_p (&th, &ti);
if (err != TD_OK)
error ("Cannot get thread info for thread %ld: %s",
(long) GET_THREAD (pid), thread_db_err_str (err));
if (ti.ti_state == TD_THR_ACTIVE && ti.ti_lid != 0)
{
snprintf (buf, sizeof (buf), "Thread %ld (LWP %d)",
(long) ti.ti_tid, ti.ti_lid);
}
else
{
snprintf (buf, sizeof (buf), "Thread %ld (%s)",
(long) ti.ti_tid, thread_db_state_str (ti.ti_state));
}
return buf;
}
if (target_beneath->to_pid_to_str (pid))
return target_beneath->to_pid_to_str (pid);
return normal_pid_to_str (pid);
}
static void
init_thread_db_ops (void)
{
thread_db_ops.to_shortname = "multi-thread";
thread_db_ops.to_longname = "multi-threaded child process.";
thread_db_ops.to_doc = "Threads and pthreads support.";
thread_db_ops.to_detach = thread_db_detach;
thread_db_ops.to_resume = thread_db_resume;
thread_db_ops.to_wait = thread_db_wait;
thread_db_ops.to_fetch_registers = thread_db_fetch_registers;
thread_db_ops.to_store_registers = thread_db_store_registers;
thread_db_ops.to_xfer_memory = thread_db_xfer_memory;
thread_db_ops.to_kill = thread_db_kill;
thread_db_ops.to_create_inferior = thread_db_create_inferior;
thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
thread_db_ops.to_thread_alive = thread_db_thread_alive;
thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
thread_db_ops.to_stratum = thread_stratum;
thread_db_ops.to_has_thread_control = tc_schedlock;
thread_db_ops.to_magic = OPS_MAGIC;
}
void
_initialize_thread_db (void)
{
/* Only initialize the module if we can load libthread_db. */
if (thread_db_load ())
{
init_thread_db_ops ();
add_target (&thread_db_ops);
/* Add ourselves to objfile event chain. */
target_new_objfile_chain = target_new_objfile_hook;
target_new_objfile_hook = thread_db_new_objfile;
}
}