Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 1673 insertions, 0 deletions

diff --git a/gdb/sol-thread.c b/gdb/sol-thread.c
new file mode 100644
index 00000000000..3fe6268bf31
--- /dev/null
+++ b/gdb/sol-thread.c
@@ -0,0 +1,1673 @@
+/* Low level interface for debugging Solaris threads for GDB, the GNU debugger.
+   Copyright 1996, 1997, 1998 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.  */
+
+/* This module implements a sort of half target that sits between the
+   machine-independent parts of GDB and the /proc interface (procfs.c) to
+   provide access to the Solaris user-mode thread implementation.
+
+   Solaris threads are true user-mode threads, which are invoked via the thr_*
+   and pthread_* (native and Posix respectivly) interfaces.  These are mostly
+   implemented in user-space, with all thread context kept in various
+   structures that live in the user's heap.  These should not be confused with
+   lightweight processes (LWPs), which are implemented by the kernel, and
+   scheduled without explicit intervention by the process.
+
+   Just to confuse things a little, Solaris threads (both native and Posix) are
+   actually implemented using LWPs.  In general, there are going to be more
+   threads than LWPs.  There is no fixed correspondence between a thread and an
+   LWP.  When a thread wants to run, it gets scheduled onto the first available
+   LWP and can therefore migrate from one LWP to another as time goes on.  A
+   sleeping thread may not be associated with an LWP at all!
+
+   To make it possible to mess with threads, Sun provides a library called
+   libthread_db.so.1 (not to be confused with libthread_db.so.0, which doesn't
+   have a published interface).  This interface has an upper part, which it
+   provides, and a lower part which I provide.  The upper part consists of the
+   td_* routines, which allow me to find all the threads, query their state,
+   etc...  The lower part consists of all of the ps_*, which are used by the
+   td_* routines to read/write memory, manipulate LWPs, lookup symbols, etc...
+   The ps_* routines actually do most of their work by calling functions in
+   procfs.c.  */
+
+#include "defs.h"
+#include <thread.h>
+#include <proc_service.h>
+#include <thread_db.h>
+#include "gdbthread.h"
+#include "target.h"
+#include "inferior.h"
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <dlfcn.h>
+#include "gdbcmd.h"
+
+extern struct target_ops sol_thread_ops; /* Forward declaration */
+extern struct target_ops sol_core_ops; /* Forward declaration */
+
+/* place to store core_ops before we overwrite it */
+static struct target_ops orig_core_ops;
+
+struct target_ops sol_thread_ops;
+struct target_ops sol_core_ops;
+
+extern int procfs_suppress_run;
+extern struct target_ops procfs_ops; /* target vector for procfs.c */
+extern struct target_ops core_ops; /* target vector for corelow.c */
+extern char *procfs_pid_to_str PARAMS ((int pid));
+
+/* Note that these prototypes differ slightly from those used in procfs.c
+   for of two reasons.  One, we can't use gregset_t, as that's got a whole
+   different meaning under Solaris (also, see above).  Two, we can't use the
+   pointer form here as these are actually arrays of ints (for Sparc's at
+   least), and are automatically coerced into pointers to ints when used as
+   parameters.  That makes it impossible to avoid a compiler warning when
+   passing pr{g fp}regset_t's from a parameter to an argument of one of
+   these functions.  */
+
+extern void supply_gregset PARAMS ((const prgregset_t));
+extern void fill_gregset PARAMS ((prgregset_t, int));
+extern void supply_fpregset PARAMS ((const prfpregset_t *));
+extern void fill_fpregset PARAMS ((prfpregset_t *, int));
+
+/* This struct is defined by us, but mainly used for the proc_service interface.
+   We don't have much use for it, except as a handy place to get a real pid
+   for memory accesses.  */
+
+struct ps_prochandle
+{
+  pid_t pid;
+};
+
+struct string_map
+{
+  int num;
+  char *str;
+};
+
+static struct ps_prochandle main_ph;
+static td_thragent_t *main_ta;
+static int sol_thread_active = 0;
+
+static struct cleanup * save_inferior_pid PARAMS ((void));
+static void restore_inferior_pid PARAMS ((int pid));
+static char *td_err_string PARAMS ((td_err_e errcode));
+static char *td_state_string PARAMS ((td_thr_state_e statecode));
+static int  thread_to_lwp PARAMS ((int thread_id, int default_lwp));
+static void sol_thread_resume PARAMS ((int pid, int step,
+				       enum target_signal signo));
+static int lwp_to_thread PARAMS ((int lwp));
+static int sol_thread_alive PARAMS ((int pid));
+static void sol_core_close PARAMS ((int quitting));
+
+static void init_sol_thread_ops PARAMS ((void));
+static void init_sol_core_ops PARAMS ((void));
+
+#define THREAD_FLAG 0x80000000
+#define is_thread(ARG) (((ARG) & THREAD_FLAG) != 0)
+#define is_lwp(ARG) (((ARG) & THREAD_FLAG) == 0)
+#define GET_LWP(LWP_ID) (TIDGET(LWP_ID))
+#define GET_THREAD(THREAD_ID) (((THREAD_ID) >> 16) & 0x7fff)
+#define BUILD_LWP(LWP_ID, PID) ((LWP_ID) << 16 | (PID))
+#define BUILD_THREAD(THREAD_ID, PID) (THREAD_FLAG | BUILD_LWP (THREAD_ID, PID))
+
+/* Pointers to routines from lithread_db resolved by dlopen() */
+
+static void
+  (*p_td_log) (const int on_off);
+static td_err_e
+  (*p_td_ta_new) (const struct ps_prochandle *ph_p, td_thragent_t **ta_pp);
+static td_err_e
+  (*p_td_ta_delete) (td_thragent_t *ta_p);
+static td_err_e
+  (*p_td_init) (void);
+static td_err_e
+  (*p_td_ta_get_ph) (const td_thragent_t *ta_p, struct ps_prochandle **ph_pp);
+static td_err_e
+  (*p_td_ta_get_nthreads) (const td_thragent_t *ta_p, int *nthread_p);
+static td_err_e
+  (*p_td_ta_tsd_iter) (const td_thragent_t *ta_p, td_key_iter_f *cb, void *cbdata_p);
+static td_err_e
+  (*p_td_ta_thr_iter) (const td_thragent_t *ta_p, td_thr_iter_f *cb, void *cbdata_p, td_thr_state_e state,
+		       int ti_pri, sigset_t *ti_sigmask_p, unsigned ti_user_flags);
+static td_err_e
+  (*p_td_thr_validate) (const td_thrhandle_t *th_p);
+static td_err_e
+  (*p_td_thr_tsd) (const td_thrhandle_t *th_p, const thread_key_t key, void **data_pp);
+static td_err_e
+  (*p_td_thr_get_info) (const td_thrhandle_t *th_p, td_thrinfo_t *ti_p);
+static td_err_e
+  (*p_td_thr_getfpregs) (const td_thrhandle_t *th_p, prfpregset_t *fpregset);
+static td_err_e
+  (*p_td_thr_getxregsize) (const td_thrhandle_t *th_p, int *xregsize);
+static td_err_e
+  (*p_td_thr_getxregs) (const td_thrhandle_t *th_p, const caddr_t xregset);
+static td_err_e
+  (*p_td_thr_sigsetmask) (const td_thrhandle_t *th_p, const sigset_t ti_sigmask);
+static td_err_e
+  (*p_td_thr_setprio) (const td_thrhandle_t *th_p, const int ti_pri);
+static td_err_e
+  (*p_td_thr_setsigpending) (const td_thrhandle_t *th_p, const uchar_t ti_pending_flag, const sigset_t ti_pending);
+static td_err_e
+  (*p_td_thr_setfpregs) (const td_thrhandle_t *th_p, const prfpregset_t *fpregset);
+static td_err_e
+  (*p_td_thr_setxregs) (const td_thrhandle_t *th_p, const caddr_t xregset);
+static td_err_e
+  (*p_td_ta_map_id2thr) (const td_thragent_t *ta_p, thread_t tid, td_thrhandle_t *th_p);
+static td_err_e
+  (*p_td_ta_map_lwp2thr) (const td_thragent_t *ta_p, lwpid_t lwpid, td_thrhandle_t *th_p);
+static td_err_e
+  (*p_td_thr_getgregs) (const td_thrhandle_t *th_p, prgregset_t regset);
+static td_err_e
+  (*p_td_thr_setgregs) (const td_thrhandle_t *th_p, const prgregset_t regset);
+
+/*
+
+LOCAL FUNCTION
+
+	td_err_string - Convert a thread_db error code to a string
+
+SYNOPSIS
+
+	char * td_err_string (errcode)
+
+DESCRIPTION
+
+	Return the thread_db error string associated with errcode.  If errcode
+	is unknown, then return a message.
+
+ */
+
+static char *
+td_err_string (errcode)
+     td_err_e errcode;
+{
+  static struct string_map
+    td_err_table[] = {
+      {TD_OK,		"generic \"call succeeded\""},
+      {TD_ERR,		"generic error."},
+      {TD_NOTHR,	"no thread can be found to satisfy query"},
+      {TD_NOSV,		"no synch. variable can be found to satisfy query"},
+      {TD_NOLWP,	"no lwp can be found to satisfy query"},
+      {TD_BADPH,	"invalid process handle"},
+      {TD_BADTH,	"invalid thread handle"},
+      {TD_BADSH,	"invalid synchronization handle"},
+      {TD_BADTA,	"invalid thread agent"},
+      {TD_BADKEY,	"invalid key"},
+      {TD_NOMSG,	"td_thr_event_getmsg() called when there was no message"},
+      {TD_NOFPREGS,	"FPU register set not available for given thread"},
+      {TD_NOLIBTHREAD,	"application not linked with libthread"},
+      {TD_NOEVENT,	"requested event is not supported"},
+      {TD_NOCAPAB,	"capability not available"},
+      {TD_DBERR,	"Debugger service failed"},
+      {TD_NOAPLIC,	"Operation not applicable to"},
+      {TD_NOTSD,	"No thread specific data for this thread"},
+      {TD_MALLOC,	"Malloc failed"},
+      {TD_PARTIALREG,	"Only part of register set was writen/read"},
+      {TD_NOXREGS,	"X register set not available for given thread"}
+    };
+  const int td_err_size = sizeof td_err_table / sizeof (struct string_map);
+  int i;
+  static char buf[50];
+
+  for (i = 0; i < td_err_size; i++)
+    if (td_err_table[i].num == errcode)
+      return td_err_table[i].str;
+		  
+  sprintf (buf, "Unknown thread_db error code: %d", errcode);
+
+  return buf;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	td_state_string - Convert a thread_db state code to a string
+
+SYNOPSIS
+
+	char * td_state_string (statecode)
+
+DESCRIPTION
+
+	Return the thread_db state string associated with statecode.  If
+	statecode is unknown, then return a message.
+
+ */
+
+static char *
+td_state_string (statecode)
+     td_thr_state_e statecode;
+{
+  static struct string_map
+    td_thr_state_table[] = {
+      {TD_THR_ANY_STATE, "any state"},
+      {TD_THR_UNKNOWN,	"unknown"},
+      {TD_THR_STOPPED,	"stopped"},
+      {TD_THR_RUN,	"run"},
+      {TD_THR_ACTIVE,	"active"},
+      {TD_THR_ZOMBIE,	"zombie"},
+      {TD_THR_SLEEP,	"sleep"},
+      {TD_THR_STOPPED_ASLEEP, "stopped asleep"}
+    };
+  const int td_thr_state_table_size = sizeof td_thr_state_table / sizeof (struct string_map);
+  int i;
+  static char buf[50];
+
+  for (i = 0; i < td_thr_state_table_size; i++)
+    if (td_thr_state_table[i].num == statecode)
+      return td_thr_state_table[i].str;
+		  
+  sprintf (buf, "Unknown thread_db state code: %d", statecode);
+
+  return buf;
+}
+
+/*
+
+LOCAL FUNCTION
+
+	thread_to_lwp - Convert a Posix or Solaris thread id to a LWP id.
+
+SYNOPSIS
+
+	int thread_to_lwp (thread_id, default_lwp)
+
+DESCRIPTION
+
+	This function converts a Posix or Solaris thread id to a lightweight
+	process id.  If thread_id is non-existent, that's an error.  If it's
+	an inactive thread, then we return default_lwp.
+
+NOTES
+
+	This function probably shouldn't call error()...
+
+ */
+
+static int
+thread_to_lwp (thread_id, default_lwp)
+     int thread_id;
+     int default_lwp;
+{
+  td_thrinfo_t ti;
+  td_thrhandle_t th;
+  td_err_e val;
+
+  if (is_lwp (thread_id))
+    return thread_id;			/* It's already an LWP id */
+
+  /* It's a thread.  Convert to lwp */
+
+  val = p_td_ta_map_id2thr (main_ta, GET_THREAD (thread_id), &th);
+  if (val == TD_NOTHR)
+    return -1;		/* thread must have terminated */
+  else if (val != TD_OK)
+    error ("thread_to_lwp: td_ta_map_id2thr %s", td_err_string (val));
+
+  val = p_td_thr_get_info (&th, &ti);
+  if (val == TD_NOTHR)
+    return -1;		/* thread must have terminated */
+  else if (val != TD_OK)
+    error ("thread_to_lwp: td_thr_get_info: %s", td_err_string (val));
+
+  if (ti.ti_state != TD_THR_ACTIVE)
+    {
+      if (default_lwp != -1)
+	return default_lwp;
+      error ("thread_to_lwp: thread state not active: %s",
+	     td_state_string (ti.ti_state));
+    }
+
+  return BUILD_LWP (ti.ti_lid, PIDGET (thread_id));
+}
+
+/*
+
+LOCAL FUNCTION
+
+	lwp_to_thread - Convert a LWP id to a Posix or Solaris thread id.
+
+SYNOPSIS
+
+	int lwp_to_thread (lwp_id)
+
+DESCRIPTION
+
+	This function converts a lightweight process id to a Posix or Solaris
+	thread id.  If thread_id is non-existent, that's an error.
+
+NOTES
+
+	This function probably shouldn't call error()...
+
+ */
+
+static int
+lwp_to_thread (lwp)
+     int lwp;
+{
+  td_thrinfo_t ti;
+  td_thrhandle_t th;
+  td_err_e val;
+
+  if (is_thread (lwp))
+    return lwp;			/* It's already a thread id */
+
+  /* It's an lwp.  Convert it to a thread id.  */
+
+  if (!sol_thread_alive (lwp))
+    return -1;			/* defunct lwp */
+
+  val = p_td_ta_map_lwp2thr (main_ta, GET_LWP (lwp), &th);
+  if (val == TD_NOTHR)
+    return -1;		/* thread must have terminated */
+  else if (val != TD_OK)
+    error ("lwp_to_thread: td_ta_map_lwp2thr: %s.", td_err_string (val));
+
+  val = p_td_thr_validate (&th);
+  if (val == TD_NOTHR)
+    return lwp;			/* libthread doesn't know about it, just return lwp */
+  else if (val != TD_OK)
+    error ("lwp_to_thread: td_thr_validate: %s.", td_err_string (val));
+
+  val = p_td_thr_get_info (&th, &ti);
+  if (val == TD_NOTHR)
+    return -1;		/* thread must have terminated */
+  else if (val != TD_OK)
+    error ("lwp_to_thread: td_thr_get_info: %s.", td_err_string (val));
+
+  return BUILD_THREAD (ti.ti_tid, PIDGET (lwp));
+}
+
+/*
+
+LOCAL FUNCTION
+
+	save_inferior_pid - Save inferior_pid on the cleanup list
+	restore_inferior_pid - Restore inferior_pid from the cleanup list
+
+SYNOPSIS
+
+	struct cleanup *save_inferior_pid ()
+	void restore_inferior_pid (int pid)
+
+DESCRIPTION
+
+	These two functions act in unison to restore inferior_pid in
+	case of an error.
+
+NOTES
+
+	inferior_pid is a global variable that needs to be changed by many of
+	these routines before calling functions in procfs.c.  In order to
+	guarantee that inferior_pid gets restored (in case of errors), you
+	need to call save_inferior_pid before changing it.  At the end of the
+	function, you should invoke do_cleanups to restore it.
+
+ */
+
+
+static struct cleanup *
+save_inferior_pid ()
+{
+  return make_cleanup (restore_inferior_pid, inferior_pid);
+}
+
+static void
+restore_inferior_pid (pid)
+     int pid;
+{
+  inferior_pid = pid;
+}
+
+
+/* Most target vector functions from here on actually just pass through to
+   procfs.c, as they don't need to do anything specific for threads.  */
+
+
+/* ARGSUSED */
+static void
+sol_thread_open (arg, from_tty)
+     char *arg;
+     int from_tty;
+{
+  procfs_ops.to_open (arg, from_tty);
+}
+
+/* Attach to process PID, then initialize for debugging it
+   and wait for the trace-trap that results from attaching.  */
+
+static void
+sol_thread_attach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  procfs_ops.to_attach (args, from_tty);
+  /* Must get symbols from solibs before libthread_db can run! */
+  SOLIB_ADD ((char *)0, from_tty, (struct target_ops *)0);
+  if (sol_thread_active)
+    {
+      printf_filtered ("sol-thread active.\n");
+      main_ph.pid = inferior_pid; /* Save for xfer_memory */
+      push_target (&sol_thread_ops);
+      inferior_pid = lwp_to_thread (inferior_pid);
+      if (inferior_pid == -1)
+	inferior_pid = main_ph.pid;
+      else
+	add_thread (inferior_pid);
+    }
+  /* XXX - might want to iterate over all the threads and register them. */
+}
+
+/* Take a program previously attached to and detaches it.
+   The program resumes execution and will no longer stop
+   on signals, etc.  We'd better not have left any breakpoints
+   in the program or it'll die when it hits one.  For this
+   to work, it may be necessary for the process to have been
+   previously attached.  It *might* work if the program was
+   started via the normal ptrace (PTRACE_TRACEME).  */
+
+static void
+sol_thread_detach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  unpush_target (&sol_thread_ops);
+  procfs_ops.to_detach (args, from_tty);
+}
+
+/* Resume execution of process PID.  If STEP is nozero, then
+   just single step it.  If SIGNAL is nonzero, restart it with that
+   signal activated.  We may have to convert pid from a thread-id to an LWP id
+   for procfs.  */
+
+static void
+sol_thread_resume (pid, step, signo)
+     int pid;
+     int step;
+     enum target_signal signo;
+{
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  inferior_pid = thread_to_lwp (inferior_pid, main_ph.pid);
+  if (inferior_pid == -1)
+    inferior_pid = procfs_first_available ();
+
+  if (pid != -1)
+    {
+      int save_pid = pid;
+
+      pid = thread_to_lwp (pid, -2);
+      if (pid == -2)		/* Inactive thread */
+	error ("This version of Solaris can't start inactive threads.");
+      if (info_verbose && pid == -1)
+	warning ("Specified thread %d seems to have terminated", 
+		 GET_THREAD (save_pid));
+    }
+
+  procfs_ops.to_resume (pid, step, signo);
+
+  do_cleanups (old_chain);
+}
+
+/* Wait for any threads to stop.  We may have to convert PID from a thread id
+   to a LWP id, and vice versa on the way out.  */
+
+static int
+sol_thread_wait (pid, ourstatus)
+     int pid;
+     struct target_waitstatus *ourstatus;
+{
+  int rtnval;
+  int save_pid;
+  struct cleanup *old_chain;
+
+  save_pid = inferior_pid;
+  old_chain = save_inferior_pid ();
+
+  inferior_pid = thread_to_lwp (inferior_pid, main_ph.pid);
+  if (inferior_pid == -1)
+    inferior_pid = procfs_first_available ();
+
+  if (pid != -1)
+    {
+      int save_pid = pid;
+
+      pid = thread_to_lwp (pid, -2);
+      if (pid == -2)		/* Inactive thread */
+	error ("This version of Solaris can't start inactive threads.");
+      if (info_verbose && pid == -1)
+	warning ("Specified thread %d seems to have terminated", 
+		 GET_THREAD (save_pid));
+    }
+
+  rtnval = procfs_ops.to_wait (pid, ourstatus);
+
+  if (ourstatus->kind != TARGET_WAITKIND_EXITED)
+    {
+      /* Map the LWP of interest back to the appropriate thread ID */
+      rtnval = lwp_to_thread (rtnval);
+      if (rtnval == -1)
+	rtnval = save_pid;
+
+      /* See if we have a new thread */
+      if (is_thread (rtnval)
+	  && rtnval != save_pid
+	  && !in_thread_list (rtnval))
+	{
+	  printf_filtered ("[New %s]\n", target_pid_to_str (rtnval));
+	  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 (regno)
+     int regno;
+{
+  thread_t thread;
+  td_thrhandle_t thandle;
+  td_err_e val;
+  prgregset_t gregset;
+  prfpregset_t fpregset;
+#if 0
+  int xregsize;
+  caddr_t xregset;
+#endif
+
+  if (!is_thread (inferior_pid))
+    { /* LWP: pass the request on to procfs.c */
+      if (target_has_execution)
+	procfs_ops.to_fetch_registers (regno);
+      else
+	orig_core_ops.to_fetch_registers (regno);
+      return;
+    }
+
+  /* Solaris thread: convert inferior_pid into a td_thrhandle_t */
+
+  thread = GET_THREAD (inferior_pid);
+
+  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 integer regs */
+
+  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 the sparc, TD_PARTIALREG means that only i0->i7, l0->l7, pc and sp
+     are saved (by a thread context switch).  */
+
+  /* And, now the fp regs */
+
+  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_{g fp}regset *after* calling the td routines
+   because the td routines call ps_lget* which affect the values stored in the
+   registers array.  */
+
+  supply_gregset (gregset);
+  supply_fpregset (&fpregset);
+
+#if 0
+/* thread_db doesn't seem to handle this right */
+  val = td_thr_getxregsize (&thandle, &xregsize);
+  if (val != TD_OK && val != TD_NOXREGS)
+    error ("sol_thread_fetch_registers: td_thr_getxregsize %s",
+	   td_err_string (val));
+
+  if (val == TD_OK)
+    {
+      xregset = alloca (xregsize);
+      val = td_thr_getxregs (&thandle, xregset);
+      if (val != TD_OK)
+	error ("sol_thread_fetch_registers: td_thr_getxregs %s",
+	       td_err_string (val));
+    }
+#endif
+}
+
+static void
+sol_thread_store_registers (regno)
+     int regno;
+{
+  thread_t thread;
+  td_thrhandle_t thandle;
+  td_err_e val;
+  prgregset_t regset;
+  prfpregset_t fpregset;
+#if 0
+  int xregsize;
+  caddr_t xregset;
+#endif
+
+  if (!is_thread (inferior_pid))
+    { /* LWP: pass the request on to procfs.c */
+      procfs_ops.to_store_registers (regno);
+      return;
+    }
+
+  /* Solaris thread: convert inferior_pid into a td_thrhandle_t */
+
+  thread = GET_THREAD (inferior_pid);
+
+  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 (regno != -1)
+    {				/* Not writing all the regs */
+      /* save new register value */
+      char old_value[REGISTER_SIZE];
+      memcpy(old_value, & registers[REGISTER_BYTE(regno)], REGISTER_SIZE);
+
+      val = p_td_thr_getgregs (&thandle, regset);
+      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 */
+      memcpy(& registers[REGISTER_BYTE(regno)], old_value, REGISTER_SIZE);
+
+#if 0
+/* thread_db doesn't seem to handle this right */
+      val = td_thr_getxregsize (&thandle, &xregsize);
+      if (val != TD_OK && val != TD_NOXREGS)
+	error ("sol_thread_store_registers: td_thr_getxregsize %s",
+	       td_err_string (val));
+
+      if (val == TD_OK)
+	{
+	  xregset = alloca (xregsize);
+	  val = td_thr_getxregs (&thandle, xregset);
+	  if (val != TD_OK)
+	    error ("sol_thread_store_registers: td_thr_getxregs %s",
+		   td_err_string (val));
+	}
+#endif
+    }
+
+  fill_gregset (regset, regno);
+  fill_fpregset (&fpregset, regno);
+
+  val = p_td_thr_setgregs (&thandle, regset);
+  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));
+
+#if 0
+/* thread_db doesn't seem to handle this right */
+  val = td_thr_getxregsize (&thandle, &xregsize);
+  if (val != TD_OK && val != TD_NOXREGS)
+    error ("sol_thread_store_registers: td_thr_getxregsize %s",
+	   td_err_string (val));
+
+  /* Should probably do something about writing the xregs here, but what are
+     they? */
+#endif
+}
+
+/* Get ready to modify the registers array.  On machines which store
+   individual registers, this doesn't need to do anything.  On machines
+   which store all the registers in one fell swoop, this makes sure
+   that registers contains all the registers from the program being
+   debugged.  */
+
+static void
+sol_thread_prepare_to_store ()
+{
+  procfs_ops.to_prepare_to_store ();
+}
+
+static int
+sol_thread_xfer_memory (memaddr, myaddr, len, dowrite, target)
+     CORE_ADDR memaddr;
+     char *myaddr;
+     int len;
+     int dowrite;
+     struct target_ops *target; /* ignored */
+{
+  int retval;
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  if (is_thread (inferior_pid) ||		/* A thread */
+      !target_thread_alive (inferior_pid))	/* An lwp, but not alive */
+    inferior_pid = procfs_first_available ();	/* Find any live lwp.  */
+  /* Note: don't need to call switch_to_thread; we're just reading memory.  */
+
+  if (target_has_execution)
+    retval = procfs_ops.to_xfer_memory (memaddr, myaddr, len, dowrite, target);
+  else
+    retval = orig_core_ops.to_xfer_memory (memaddr, myaddr, len,
+					   dowrite, target);
+
+  do_cleanups (old_chain);
+
+  return retval;
+}
+
+/* Print status information about what we're accessing.  */
+
+static void
+sol_thread_files_info (ignore)
+     struct target_ops *ignore;
+{
+  procfs_ops.to_files_info (ignore);
+}
+
+static void
+sol_thread_kill_inferior ()
+{
+  procfs_ops.to_kill ();
+}
+
+static void
+sol_thread_notice_signals (pid)
+     int pid;
+{
+  procfs_ops.to_notice_signals (PIDGET (pid));
+}
+
+/* Fork an inferior process, and start debugging it with /proc.  */
+
+static void
+sol_thread_create_inferior (exec_file, allargs, env)
+     char *exec_file;
+     char *allargs;
+     char **env;
+{
+  procfs_ops.to_create_inferior (exec_file, allargs, env);
+
+  if (sol_thread_active && inferior_pid != 0)
+    {
+      main_ph.pid = inferior_pid; /* Save for xfer_memory */
+
+      push_target (&sol_thread_ops);
+
+      inferior_pid = lwp_to_thread (inferior_pid);
+      if (inferior_pid == -1)
+	inferior_pid = main_ph.pid;
+
+      add_thread (inferior_pid);
+    }
+}
+
+/* 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.  */
+
+void
+sol_thread_new_objfile (objfile)
+     struct objfile *objfile;
+{
+  td_err_e val;
+
+  if (!objfile)
+    {
+      sol_thread_active = 0;
+
+      return;
+    }
+
+  /* don't do anything if init failed to resolve the libthread_db library */
+  if (!procfs_suppress_run)
+    return;
+
+  /* Now, initialize the thread debugging library.  This needs to be done after
+     the shared libraries are located because it needs information from the
+     user's thread library.  */
+
+  val = p_td_init ();
+  if (val != TD_OK)
+    error ("target_new_objfile: td_init: %s", td_err_string (val));
+
+  val = p_td_ta_new (&main_ph, &main_ta);
+  if (val == TD_NOLIBTHREAD)
+    return;
+  else if (val != TD_OK)
+    error ("target_new_objfile: td_ta_new: %s", td_err_string (val));
+
+  sol_thread_active = 1;
+}
+
+/* Clean up after the inferior dies.  */
+
+static void
+sol_thread_mourn_inferior ()
+{
+  unpush_target (&sol_thread_ops);
+  procfs_ops.to_mourn_inferior ();
+}
+
+/* Mark our target-struct as eligible for stray "run" and "attach" commands.  */
+
+static int
+sol_thread_can_run ()
+{
+  return procfs_suppress_run;
+}
+
+/* 
+
+LOCAL FUNCTION
+
+	sol_thread_alive     - test thread for "aliveness"
+
+SYNOPSIS
+
+	static bool sol_thread_alive (int pid);
+
+DESCRIPTION
+
+	returns true if thread still active in inferior.
+
+ */
+
+static int
+sol_thread_alive (pid)
+     int pid;
+{
+  if (is_thread (pid))		/* non-kernel thread */
+    {
+      td_err_e val;
+      td_thrhandle_t th;
+
+      pid = GET_THREAD (pid);
+      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: return true */
+    }
+  else			/* kernel thread (LWP): let procfs test it */
+    {
+      if (target_has_execution)
+	return procfs_ops.to_thread_alive (pid);
+      else
+	return orig_core_ops.to_thread_alive (pid);
+    }
+}
+
+static void
+sol_thread_stop ()
+{
+  procfs_ops.to_stop ();
+}
+
+/* These routines implement the lower half of the thread_db interface.  Ie: 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 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;
+#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
+
+
+/* The next four routines are called by thread_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.  */
+
+ps_err_e
+ps_pstop (gdb_ps_prochandle_t ph)
+{
+  return PS_OK;
+}
+
+ps_err_e
+ps_pcontinue (gdb_ps_prochandle_t ph)
+{
+  return PS_OK;
+}
+
+ps_err_e
+ps_lstop (gdb_ps_prochandle_t ph, lwpid_t lwpid)
+{
+  return PS_OK;
+}
+
+ps_err_e
+ps_lcontinue (gdb_ps_prochandle_t ph, lwpid_t lwpid)
+{
+  return PS_OK;
+}
+
+ps_err_e
+ps_pglobal_lookup (gdb_ps_prochandle_t ph, const char *ld_object_name,
+		   const char *ld_symbol_name, paddr_t *ld_symbol_addr)
+{
+  struct minimal_symbol *ms;
+
+  ms = lookup_minimal_symbol (ld_symbol_name, NULL, NULL);
+
+  if (!ms)
+    return PS_NOSYM;
+
+  *ld_symbol_addr = SYMBOL_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, paddr_t addr,
+	   char *buf, int size)
+{
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  if (is_thread (inferior_pid) ||		/* A thread */
+      !target_thread_alive (inferior_pid))	/* An lwp, but not alive */
+    inferior_pid = procfs_first_available ();	/* Find any live lwp.  */
+  /* Note: don't need to call switch_to_thread; we're just reading memory.  */
+
+  while (size > 0)
+    {
+      int cc;
+
+      if (target_has_execution)
+	cc = procfs_ops.to_xfer_memory (addr, buf, size, dowrite, &procfs_ops);
+      else
+	cc = orig_core_ops.to_xfer_memory (addr, buf, size, dowrite, &core_ops);
+
+      if (cc < 0)
+	{
+	  if (dowrite == 0)
+	    print_sys_errmsg ("rw_common (): read", errno);
+	  else
+	    print_sys_errmsg ("rw_common (): write", errno);
+
+	  do_cleanups (old_chain);
+
+	  return PS_ERR;
+	}
+      size -= cc;
+      buf += cc;
+    }
+
+  do_cleanups (old_chain);
+
+  return PS_OK;
+}
+
+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 rw_common (0, ph, addr, buf, size);
+}
+
+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 rw_common (1, ph, addr, (char*) buf, size);
+}
+
+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 rw_common (0, ph, addr, buf, size);
+}
+
+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 rw_common (1, ph, addr, (char*) buf, size);
+}
+
+/* Get integer regs */
+
+ps_err_e
+ps_lgetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
+	     prgregset_t gregset)
+{
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  inferior_pid = BUILD_LWP (lwpid, PIDGET (inferior_pid));
+  
+  if (target_has_execution)
+    procfs_ops.to_fetch_registers (-1);
+  else
+    orig_core_ops.to_fetch_registers (-1);
+  fill_gregset (gregset, -1);
+
+  do_cleanups (old_chain);
+
+  return PS_OK;
+}
+
+/* Set integer regs */
+
+ps_err_e
+ps_lsetregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
+	     const prgregset_t gregset)
+{
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  inferior_pid = BUILD_LWP (lwpid, PIDGET (inferior_pid));
+  
+  supply_gregset (gregset);
+  if (target_has_execution)
+    procfs_ops.to_store_registers (-1);
+  else
+    orig_core_ops.to_store_registers (-1);
+
+  do_cleanups (old_chain);
+
+  return PS_OK;
+}
+
+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)
+{
+#if 0
+  int lwp_fd;
+  int regsize;
+  ps_err_e val;
+
+  val = get_lwp_fd (ph, lwpid, &lwp_fd);
+  if (val != PS_OK)
+    return val;
+
+  if (ioctl (lwp_fd, PIOCGXREGSIZE, &regsize))
+    {
+      if (errno == EINVAL)
+	return PS_NOFREGS;	/* XXX Wrong code, but this is the closest
+				   thing in proc_service.h  */
+
+      print_sys_errmsg ("ps_lgetxregsize (): PIOCGXREGSIZE", errno);
+      return PS_ERR;
+    }
+#endif
+
+  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)
+{
+#if 0
+  int lwp_fd;
+  ps_err_e val;
+
+  val = get_lwp_fd (ph, lwpid, &lwp_fd);
+  if (val != PS_OK)
+    return val;
+
+  if (ioctl (lwp_fd, PIOCGXREG, xregset))
+    {
+      print_sys_errmsg ("ps_lgetxregs (): PIOCGXREG", errno);
+      return PS_ERR;
+    }
+#endif
+
+  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)
+{
+#if 0
+  int lwp_fd;
+  ps_err_e val;
+
+  val = get_lwp_fd (ph, lwpid, &lwp_fd);
+  if (val != PS_OK)
+    return val;
+
+  if (ioctl (lwp_fd, PIOCSXREG, xregset))
+    {
+      print_sys_errmsg ("ps_lsetxregs (): PIOCSXREG", errno);
+      return PS_ERR;
+    }
+#endif
+
+  return PS_OK;
+}
+
+/* Get floating-point regs.  */
+
+ps_err_e
+ps_lgetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
+	       prfpregset_t *fpregset)
+{
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  inferior_pid = BUILD_LWP (lwpid, PIDGET (inferior_pid));
+
+  if (target_has_execution)
+    procfs_ops.to_fetch_registers (-1);
+  else
+    orig_core_ops.to_fetch_registers (-1);
+  fill_fpregset (fpregset, -1);
+
+  do_cleanups (old_chain);
+
+  return PS_OK;
+}
+
+/* Set floating-point regs.  */
+
+ps_err_e
+ps_lsetfpregs (gdb_ps_prochandle_t ph, lwpid_t lwpid,
+	       const prfpregset_t *fpregset)
+{
+  struct cleanup *old_chain;
+
+  old_chain = save_inferior_pid ();
+
+  inferior_pid = BUILD_LWP (lwpid, PIDGET (inferior_pid));
+  
+  supply_fpregset (fpregset);
+  if (target_has_execution)
+    procfs_ops.to_store_registers (-1);
+  else
+    orig_core_ops.to_store_registers (-1);
+
+  do_cleanups (old_chain);
+
+  return PS_OK;
+}
+
+#ifdef TM_I386SOL2_H
+
+/* Get local descriptor table.  */
+
+#include <sys/procfs.h>
+#include <sys/reg.h>
+#include <sys/sysi86.h>
+
+static int nldt_allocated = 0;
+static struct ssd *ldt_bufp = NULL;
+
+ps_err_e
+ps_lgetLDT (gdb_ps_prochandle_t ph, lwpid_t lwpid,
+	    struct ssd *pldt)
+{
+  gregset_t gregset;
+  int lwp_fd;
+  ps_err_e val;
+  int nldt;
+  int i;
+
+  /* Get procfs file descriptor for the LWP.  */
+  lwp_fd = procfs_get_pid_fd (BUILD_LWP (lwpid, PIDGET (inferior_pid)));
+  if (lwp_fd < 0)
+    return PS_BADLID;
+
+  /* Fetch registers und LDT descriptors.  */
+  if (ioctl (lwp_fd, PIOCGREG, &gregset) == -1)
+    return PS_ERR;
+
+  if (ioctl (lwp_fd, PIOCNLDT, &nldt) == -1)
+    return PS_ERR;
+
+  if (nldt_allocated < nldt)
+    {
+      ldt_bufp
+	= (struct ssd *) xrealloc (ldt_bufp, (nldt + 1) * sizeof (struct ssd));
+      nldt_allocated = nldt;
+    }
+
+  if (ioctl (lwp_fd, PIOCLDT, ldt_bufp) == -1)
+    return PS_ERR;
+
+  /* Search LDT for the LWP via register GS.  */
+  for (i = 0; i < nldt; i++)
+    {
+      if (ldt_bufp[i].sel == (gregset[GS] & 0xffff))
+	{
+	  *pldt = ldt_bufp[i];
+	  return PS_OK;
+	}
+    }
+
+  /* LDT not found.  */
+  return PS_ERR;
+}        
+#endif /* TM_I386SOL2_H */
+
+/* Convert a pid to printable form. */
+
+char *
+solaris_pid_to_str (pid)
+     int pid;
+{
+  static char buf[100];
+
+  /* in case init failed to resolve the libthread_db library */
+  if (!procfs_suppress_run)
+    return procfs_pid_to_str (pid);
+
+  if (is_thread (pid))
+    {
+      int lwp;
+
+      lwp = thread_to_lwp (pid, -2);
+
+      if (lwp == -1)
+	sprintf (buf, "Thread %d (defunct)", GET_THREAD (pid));
+      else if (lwp != -2)
+	sprintf (buf, "Thread %d (LWP %d)", GET_THREAD (pid), GET_LWP (lwp));
+      else
+	sprintf (buf, "Thread %d        ", GET_THREAD (pid));
+    }
+  else if (GET_LWP (pid) != 0)
+    sprintf (buf, "LWP    %d        ", GET_LWP (pid));
+  else
+    sprintf (buf, "process %d    ", PIDGET (pid));
+
+  return buf;
+}
+
+
+/* Worker bee for find_new_threads
+   Callback function that gets called once per USER thread (i.e., not
+   kernel) thread. */
+
+static int
+sol_find_new_threads_callback(th, ignored)
+     const td_thrhandle_t *th;
+     void *ignored;
+{
+  td_err_e retval;
+  td_thrinfo_t ti;
+  int pid;
+
+  if ((retval = p_td_thr_get_info(th, &ti)) != TD_OK)
+    {
+      return -1;
+    }
+  pid = BUILD_THREAD(ti.ti_tid, PIDGET(inferior_pid));
+  if (!in_thread_list(pid))
+    add_thread(pid);
+
+  return 0;
+}
+
+void
+sol_find_new_threads()
+{
+  /* don't do anything if init failed to resolve the libthread_db library */
+  if (!procfs_suppress_run)
+    return;
+
+  if (inferior_pid == -1)
+    {
+      printf_filtered("No process.\n");
+      return;
+    }
+  p_td_ta_thr_iter (main_ta, sol_find_new_threads_callback, (void *)0,
+		    TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
+		    TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
+}
+
+static void
+sol_core_open (filename, from_tty)
+     char *filename;
+     int from_tty;
+{
+  orig_core_ops.to_open (filename, from_tty);
+}
+
+static void
+sol_core_close (quitting)
+     int quitting;
+{
+  orig_core_ops.to_close (quitting);
+}
+
+static void
+sol_core_detach (args, from_tty)
+     char *args;
+     int from_tty;
+{
+  unpush_target (&core_ops);
+  orig_core_ops.to_detach (args, from_tty);
+}
+
+static void
+sol_core_files_info (t)
+     struct target_ops *t;
+{
+  orig_core_ops.to_files_info (t);
+}
+
+#ifdef MAINTENANCE_CMDS
+/* Worker bee for info sol-thread command.  This is a callback function that
+   gets called once for each Solaris thread (ie. not kernel thread) in the 
+   inferior.  Print anything interesting that we can think of.  */
+
+static int 
+info_cb (th, s)
+     const td_thrhandle_t *th;
+     void *s;
+{
+  td_err_e ret;
+  td_thrinfo_t ti;
+  struct minimal_symbol *msym;
+
+  if ((ret = p_td_thr_get_info (th, &ti)) == 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)
+	if (msym = lookup_minimal_symbol_by_pc (ti.ti_startfunc))
+	  printf_filtered ("   startfunc: %s\n", SYMBOL_NAME (msym));
+	else
+	  printf_filtered ("   startfunc: 0x%08x\n", ti.ti_startfunc);
+
+      /* If thread is asleep, print function that went to sleep: */
+      if (ti.ti_state == TD_THR_SLEEP)
+	if (msym = lookup_minimal_symbol_by_pc (ti.ti_pc))
+	  printf_filtered (" - Sleep func: %s\n", SYMBOL_NAME (msym));
+	else
+	  printf_filtered (" - Sleep func: 0x%08x\n", ti.ti_startfunc);
+
+      /* Wrap up line, if necessary */
+      if (ti.ti_state != TD_THR_SLEEP && ti.ti_startfunc == 0)
+	printf_filtered ("\n");	/* don't you hate counting newlines? */
+    }
+  else
+    warning ("info sol-thread: failed to get info for thread.");
+
+  return 0;    
+}
+
+/* List some state about each Solaris user thread in the inferior.  */
+
+static void
+info_solthreads (args, from_tty)
+     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);
+}
+#endif /* MAINTENANCE_CMDS */
+
+static int
+ignore (addr, contents)
+     CORE_ADDR addr;
+     char *contents;
+{
+  return 0;
+}
+
+
+static void
+init_sol_thread_ops ()
+{
+  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_open = sol_thread_open;
+  sol_thread_ops.to_close = 0;
+  sol_thread_ops.to_attach = sol_thread_attach;
+  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_prepare_to_store = sol_thread_prepare_to_store;
+  sol_thread_ops.to_xfer_memory = sol_thread_xfer_memory;
+  sol_thread_ops.to_files_info = sol_thread_files_info;
+  sol_thread_ops.to_insert_breakpoint = memory_insert_breakpoint;
+  sol_thread_ops.to_remove_breakpoint = memory_remove_breakpoint;
+  sol_thread_ops.to_terminal_init = terminal_init_inferior;
+  sol_thread_ops.to_terminal_inferior = terminal_inferior;
+  sol_thread_ops.to_terminal_ours_for_output = terminal_ours_for_output;
+  sol_thread_ops.to_terminal_ours = terminal_ours;
+  sol_thread_ops.to_terminal_info = child_terminal_info;
+  sol_thread_ops.to_kill = sol_thread_kill_inferior;
+  sol_thread_ops.to_load = 0;
+  sol_thread_ops.to_lookup_symbol = 0;
+  sol_thread_ops.to_create_inferior = sol_thread_create_inferior;
+  sol_thread_ops.to_mourn_inferior = sol_thread_mourn_inferior;
+  sol_thread_ops.to_can_run = sol_thread_can_run;
+  sol_thread_ops.to_notice_signals = sol_thread_notice_signals;
+  sol_thread_ops.to_thread_alive = sol_thread_alive;
+  sol_thread_ops.to_stop = sol_thread_stop;
+  sol_thread_ops.to_stratum = process_stratum;
+  sol_thread_ops.to_has_all_memory = 1;
+  sol_thread_ops.to_has_memory = 1;
+  sol_thread_ops.to_has_stack = 1;
+  sol_thread_ops.to_has_registers = 1;
+  sol_thread_ops.to_has_execution = 1;
+  sol_thread_ops.to_has_thread_control = tc_none;
+  sol_thread_ops.to_sections = 0;
+  sol_thread_ops.to_sections_end = 0;
+  sol_thread_ops.to_magic = OPS_MAGIC;
+}
+
+
+static void
+init_sol_core_ops ()
+{
+  sol_core_ops.to_shortname  = "solaris-core";
+  sol_core_ops.to_longname  = "Solaris core threads and pthread.";
+  sol_core_ops.to_doc  = "Solaris threads and pthread support for core files.";
+  sol_core_ops.to_open  = sol_core_open;
+  sol_core_ops.to_close  = sol_core_close;
+  sol_core_ops.to_attach  = sol_thread_attach;
+  sol_core_ops.to_detach  = sol_core_detach;
+  /* sol_core_ops.to_resume  = 0; */
+  /* sol_core_ops.to_wait  = 0;	 */
+  sol_core_ops.to_fetch_registers  = sol_thread_fetch_registers;
+  /* sol_core_ops.to_store_registers  = 0; */
+  /* sol_core_ops.to_prepare_to_store  = 0; */
+  sol_core_ops.to_xfer_memory  = sol_thread_xfer_memory;
+  sol_core_ops.to_files_info  = sol_core_files_info;
+  sol_core_ops.to_insert_breakpoint  = ignore;
+  sol_core_ops.to_remove_breakpoint  = ignore;
+  /* sol_core_ops.to_terminal_init  = 0; */
+  /* sol_core_ops.to_terminal_inferior  = 0; */
+  /* sol_core_ops.to_terminal_ours_for_output  = 0; */
+  /* sol_core_ops.to_terminal_ours  = 0; */
+  /* sol_core_ops.to_terminal_info  = 0; */
+  /* sol_core_ops.to_kill  = 0; */
+  /* sol_core_ops.to_load  = 0; */
+  /* sol_core_ops.to_lookup_symbol  = 0; */
+  sol_core_ops.to_create_inferior  = sol_thread_create_inferior;
+  sol_core_ops.to_stratum  = core_stratum;
+  sol_core_ops.to_has_all_memory  = 0;
+  sol_core_ops.to_has_memory  = 1;
+  sol_core_ops.to_has_stack  = 1;
+  sol_core_ops.to_has_registers  = 1;
+  sol_core_ops.to_has_execution  = 0;
+  sol_core_ops.to_has_thread_control  = tc_none;
+  sol_core_ops.to_sections  = 0;
+  sol_core_ops.to_sections_end  = 0;
+  sol_core_ops.to_magic  = OPS_MAGIC;
+}
+
+/* we suppress the call to add_target of core_ops in corelow because
+   if there are two targets in the stratum core_stratum, find_core_target
+   won't know which one to return.  see corelow.c for an additonal
+   comment on coreops_suppress_target. */
+int coreops_suppress_target = 1;
+
+void
+_initialize_sol_thread ()
+{
+  void *dlhandle;
+
+  init_sol_thread_ops ();
+  init_sol_core_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);
+
+  add_target (&sol_thread_ops);
+
+  procfs_suppress_run = 1;
+
+#ifdef MAINTENANCE_CMDS
+  add_cmd ("sol-threads", class_maintenance, info_solthreads, 
+	    "Show info on Solaris user threads.\n", &maintenanceinfolist);
+#endif /* MAINTENANCE_CMDS */
+
+  memcpy(&orig_core_ops, &core_ops, sizeof (struct target_ops));
+  memcpy(&core_ops, &sol_core_ops, sizeof (struct target_ops));
+  add_target (&core_ops);
+
+  return;
+
+ die:
+
+  fprintf_unfiltered (gdb_stderr, "[GDB will not be able to debug user-mode threads: %s]\n", dlerror ());
+
+  if (dlhandle)
+    dlclose (dlhandle);
+
+  /* allow the user to debug non-threaded core files */
+  add_target(&core_ops);
+
+  return;
+}