This commit was generated by cvs2svn to compensate for changes in r157571,

which included commits to RCS files with non-trunk default branches.

3 files changed, 1754 insertions, 0 deletions

diff --git a/gnu/usr.bin/gdb/gdbserver/fbsd-i386-low.c b/gnu/usr.bin/gdb/gdbserver/fbsd-i386-low.c
new file mode 100644
index 0000000..b79b601
--- /dev/null
+++ b/gnu/usr.bin/gdb/gdbserver/fbsd-i386-low.c
@@ -0,0 +1,176 @@
+/* GNU/Linux/i386 specific low level interface, for the remote server for GDB.
+   Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002
+   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 "server.h"
+#include "linux-low.h"
+#include "i387-fp.h"
+
+#ifdef HAVE_SYS_REG_H
+#include <sys/reg.h>
+#endif
+
+/* This module only supports access to the general purpose registers.  */
+
+#define i386_num_regs 16
+
+/* This stuff comes from i386-linux-nat.c.  */
+
+/* Mapping between the general-purpose registers in `struct user'
+   format and GDB's register array layout.  */
+static int i386_regmap[] = 
+{
+  EAX * 4, ECX * 4, EDX * 4, EBX * 4,
+  UESP * 4, EBP * 4, ESI * 4, EDI * 4,
+  EIP * 4, EFL * 4, CS * 4, SS * 4,
+  DS * 4, ES * 4, FS * 4, GS * 4
+};
+
+static int
+i386_cannot_store_register (int regno)
+{
+  return (regno >= i386_num_regs);
+}
+
+static int
+i386_cannot_fetch_register (int regno)
+{
+  return (regno >= i386_num_regs);
+}
+
+
+#ifdef HAVE_LINUX_REGSETS
+#include <sys/procfs.h>
+#include <sys/ptrace.h>
+
+static void
+i386_fill_gregset (void *buf)
+{
+  int i;
+
+  for (i = 0; i < i386_num_regs; i++)
+    collect_register (i, ((char *) buf) + i386_regmap[i]);
+
+  collect_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
+}
+
+static void
+i386_store_gregset (const void *buf)
+{
+  int i;
+
+  for (i = 0; i < i386_num_regs; i++)
+    supply_register (i, ((char *) buf) + i386_regmap[i]);
+
+  supply_register_by_name ("orig_eax", ((char *) buf) + ORIG_EAX * 4);
+}
+
+static void
+i386_fill_fpregset (void *buf)
+{
+  i387_cache_to_fsave (buf);
+}
+
+static void
+i386_store_fpregset (const void *buf)
+{
+  i387_fsave_to_cache (buf);
+}
+
+static void
+i386_fill_fpxregset (void *buf)
+{
+  i387_cache_to_fxsave (buf);
+}
+
+static void
+i386_store_fpxregset (const void *buf)
+{
+  i387_fxsave_to_cache (buf);
+}
+
+
+struct regset_info target_regsets[] = {
+  { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
+    GENERAL_REGS,
+    i386_fill_gregset, i386_store_gregset },
+#ifdef HAVE_PTRACE_GETFPXREGS
+  { PTRACE_GETFPXREGS, PTRACE_SETFPXREGS, sizeof (elf_fpxregset_t),
+    EXTENDED_REGS,
+    i386_fill_fpxregset, i386_store_fpxregset },
+#endif
+  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (elf_fpregset_t),
+    FP_REGS,
+    i386_fill_fpregset, i386_store_fpregset },
+  { 0, 0, -1, -1, NULL, NULL }
+};
+
+#endif /* HAVE_LINUX_REGSETS */
+
+static const char i386_breakpoint[] = { 0xCC };
+#define i386_breakpoint_len 1
+
+extern int debug_threads;
+
+static CORE_ADDR
+i386_get_pc ()
+{
+  unsigned long pc;
+
+  collect_register_by_name ("eip", &pc);
+
+  if (debug_threads)
+    fprintf (stderr, "stop pc (before any decrement) is %08lx\n", pc);
+  return pc;
+}
+
+static void
+i386_set_pc (CORE_ADDR newpc)
+{
+  if (debug_threads)
+    fprintf (stderr, "set pc to %08lx\n", (long) newpc);
+  supply_register_by_name ("eip", &newpc);
+}
+
+static int
+i386_breakpoint_at (CORE_ADDR pc)
+{
+  unsigned char c;
+
+  read_inferior_memory (pc, &c, 1);
+  if (c == 0xCC)
+    return 1;
+
+  return 0;
+}
+
+struct linux_target_ops the_low_target = {
+  i386_num_regs,
+  i386_regmap,
+  i386_cannot_fetch_register,
+  i386_cannot_store_register,
+  i386_get_pc,
+  i386_set_pc,
+  i386_breakpoint,
+  i386_breakpoint_len,
+  NULL,
+  1,
+  i386_breakpoint_at,
+};
diff --git a/gnu/usr.bin/gdb/gdbserver/fbsd-low.c b/gnu/usr.bin/gdb/gdbserver/fbsd-low.c
new file mode 100644
index 0000000..5733180
--- /dev/null
+++ b/gnu/usr.bin/gdb/gdbserver/fbsd-low.c
@@ -0,0 +1,1458 @@
+/* Low level interface to ptrace, for the remote server for GDB.
+   Copyright 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004
+   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 "server.h"
+#include "linux-low.h"
+
+#include <sys/wait.h>
+#include <stdio.h>
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/ptrace.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+
+/* ``all_threads'' is keyed by the LWP ID - it should be the thread ID instead,
+   however.  This requires changing the ID in place when we go from !using_threads
+   to using_threads, immediately.
+
+   ``all_processes'' is keyed by the process ID - which on Linux is (presently)
+   the same as the LWP ID.  */
+
+struct inferior_list all_processes;
+
+/* FIXME this is a bit of a hack, and could be removed.  */
+int stopping_threads;
+
+/* FIXME make into a target method?  */
+int using_threads;
+
+static void linux_resume_one_process (struct inferior_list_entry *entry,
+				      int step, int signal);
+static void linux_resume (struct thread_resume *resume_info);
+static void stop_all_processes (void);
+static int linux_wait_for_event (struct thread_info *child);
+
+struct pending_signals
+{
+  int signal;
+  struct pending_signals *prev;
+};
+
+#define PTRACE_ARG3_TYPE long
+#define PTRACE_XFER_TYPE long
+
+#ifdef HAVE_LINUX_REGSETS
+static int use_regsets_p = 1;
+#endif
+
+int debug_threads = 0;
+
+#define pid_of(proc) ((proc)->head.id)
+
+/* FIXME: Delete eventually.  */
+#define inferior_pid (pid_of (get_thread_process (current_inferior)))
+
+/* This function should only be called if the process got a SIGTRAP.
+   The SIGTRAP could mean several things.
+
+   On i386, where decr_pc_after_break is non-zero:
+   If we were single-stepping this process using PTRACE_SINGLESTEP,
+   we will get only the one SIGTRAP (even if the instruction we
+   stepped over was a breakpoint).  The value of $eip will be the
+   next instruction.
+   If we continue the process using PTRACE_CONT, we will get a
+   SIGTRAP when we hit a breakpoint.  The value of $eip will be
+   the instruction after the breakpoint (i.e. needs to be
+   decremented).  If we report the SIGTRAP to GDB, we must also
+   report the undecremented PC.  If we cancel the SIGTRAP, we
+   must resume at the decremented PC.
+
+   (Presumably, not yet tested) On a non-decr_pc_after_break machine
+   with hardware or kernel single-step:
+   If we single-step over a breakpoint instruction, our PC will
+   point at the following instruction.  If we continue and hit a
+   breakpoint instruction, our PC will point at the breakpoint
+   instruction.  */
+
+static CORE_ADDR
+get_stop_pc (void)
+{
+  CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
+
+  if (get_thread_process (current_inferior)->stepping)
+    return stop_pc;
+  else
+    return stop_pc - the_low_target.decr_pc_after_break;
+}
+
+static void *
+add_process (int pid)
+{
+  struct process_info *process;
+
+  process = (struct process_info *) malloc (sizeof (*process));
+  memset (process, 0, sizeof (*process));
+
+  process->head.id = pid;
+
+  /* Default to tid == lwpid == pid.  */
+  process->tid = pid;
+  process->lwpid = pid;
+
+  add_inferior_to_list (&all_processes, &process->head);
+
+  return process;
+}
+
+/* Start an inferior process and returns its pid.
+   ALLARGS is a vector of program-name and args. */
+
+static int
+linux_create_inferior (char *program, char **allargs)
+{
+  void *new_process;
+  int pid;
+
+  pid = fork ();
+  if (pid < 0)
+    perror_with_name ("fork");
+
+  if (pid == 0)
+    {
+      ptrace (PTRACE_TRACEME, 0, 0, 0);
+
+      signal (__SIGRTMIN + 1, SIG_DFL);
+
+      setpgid (0, 0);
+
+      execv (program, allargs);
+
+      fprintf (stderr, "Cannot exec %s: %s.\n", program,
+	       strerror (errno));
+      fflush (stderr);
+      _exit (0177);
+    }
+
+  new_process = add_process (pid);
+  add_thread (pid, new_process);
+
+  return pid;
+}
+
+/* Attach to an inferior process.  */
+
+void
+linux_attach_lwp (int pid, int tid)
+{
+  struct process_info *new_process;
+
+  if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
+    {
+      fprintf (stderr, "Cannot attach to process %d: %s (%d)\n", pid,
+	       strerror (errno), errno);
+      fflush (stderr);
+
+      /* If we fail to attach to an LWP, just return.  */
+      if (!using_threads)
+	_exit (0177);
+      return;
+    }
+
+  new_process = (struct process_info *) add_process (pid);
+  add_thread (tid, new_process);
+
+  /* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
+     brings it to a halt.  We should ignore that SIGSTOP and resume the process
+     (unless this is the first process, in which case the flag will be cleared
+     in linux_attach).
+
+     On the other hand, if we are currently trying to stop all threads, we
+     should treat the new thread as if we had sent it a SIGSTOP.  This works
+     because we are guaranteed that add_process added us to the end of the
+     list, and so the new thread has not yet reached wait_for_sigstop (but
+     will).  */
+  if (! stopping_threads)
+    new_process->stop_expected = 1;
+}
+
+int
+linux_attach (int pid)
+{
+  struct process_info *process;
+
+  linux_attach_lwp (pid, pid);
+
+  /* Don't ignore the initial SIGSTOP if we just attached to this process.  */
+  process = (struct process_info *) find_inferior_id (&all_processes, pid);
+  process->stop_expected = 0;
+
+  return 0;
+}
+
+/* Kill the inferior process.  Make us have no inferior.  */
+
+static void
+linux_kill_one_process (struct inferior_list_entry *entry)
+{
+  struct thread_info *thread = (struct thread_info *) entry;
+  struct process_info *process = get_thread_process (thread);
+  int wstat;
+
+  do
+    {
+      ptrace (PTRACE_KILL, pid_of (process), 0, 0);
+
+      /* Make sure it died.  The loop is most likely unnecessary.  */
+      wstat = linux_wait_for_event (thread);
+    } while (WIFSTOPPED (wstat));
+}
+
+static void
+linux_kill (void)
+{
+  for_each_inferior (&all_threads, linux_kill_one_process);
+}
+
+static void
+linux_detach_one_process (struct inferior_list_entry *entry)
+{
+  struct thread_info *thread = (struct thread_info *) entry;
+  struct process_info *process = get_thread_process (thread);
+
+  ptrace (PTRACE_DETACH, pid_of (process), 0, 0);
+}
+
+static void
+linux_detach (void)
+{
+  for_each_inferior (&all_threads, linux_detach_one_process);
+}
+
+/* Return nonzero if the given thread is still alive.  */
+static int
+linux_thread_alive (int tid)
+{
+  if (find_inferior_id (&all_threads, tid) != NULL)
+    return 1;
+  else
+    return 0;
+}
+
+/* Return nonzero if this process stopped at a breakpoint which
+   no longer appears to be inserted.  Also adjust the PC
+   appropriately to resume where the breakpoint used to be.  */
+static int
+check_removed_breakpoint (struct process_info *event_child)
+{
+  CORE_ADDR stop_pc;
+  struct thread_info *saved_inferior;
+
+  if (event_child->pending_is_breakpoint == 0)
+    return 0;
+
+  if (debug_threads)
+    fprintf (stderr, "Checking for breakpoint.\n");
+
+  saved_inferior = current_inferior;
+  current_inferior = get_process_thread (event_child);
+
+  stop_pc = get_stop_pc ();
+
+  /* If the PC has changed since we stopped, then we shouldn't do
+     anything.  This happens if, for instance, GDB handled the
+     decr_pc_after_break subtraction itself.  */
+  if (stop_pc != event_child->pending_stop_pc)
+    {
+      if (debug_threads)
+	fprintf (stderr, "Ignoring, PC was changed.\n");
+
+      event_child->pending_is_breakpoint = 0;
+      current_inferior = saved_inferior;
+      return 0;
+    }
+
+  /* If the breakpoint is still there, we will report hitting it.  */
+  if ((*the_low_target.breakpoint_at) (stop_pc))
+    {
+      if (debug_threads)
+	fprintf (stderr, "Ignoring, breakpoint is still present.\n");
+      current_inferior = saved_inferior;
+      return 0;
+    }
+
+  if (debug_threads)
+    fprintf (stderr, "Removed breakpoint.\n");
+
+  /* For decr_pc_after_break targets, here is where we perform the
+     decrement.  We go immediately from this function to resuming,
+     and can not safely call get_stop_pc () again.  */
+  if (the_low_target.set_pc != NULL)
+    (*the_low_target.set_pc) (stop_pc);
+
+  /* We consumed the pending SIGTRAP.  */
+  event_child->pending_is_breakpoint = 0;
+  event_child->status_pending_p = 0;
+  event_child->status_pending = 0;
+
+  current_inferior = saved_inferior;
+  return 1;
+}
+
+/* Return 1 if this process has an interesting status pending.  This function
+   may silently resume an inferior process.  */
+static int
+status_pending_p (struct inferior_list_entry *entry, void *dummy)
+{
+  struct process_info *process = (struct process_info *) entry;
+
+  if (process->status_pending_p)
+    if (check_removed_breakpoint (process))
+      {
+	/* This thread was stopped at a breakpoint, and the breakpoint
+	   is now gone.  We were told to continue (or step...) all threads,
+	   so GDB isn't trying to single-step past this breakpoint.
+	   So instead of reporting the old SIGTRAP, pretend we got to
+	   the breakpoint just after it was removed instead of just
+	   before; resume the process.  */
+	linux_resume_one_process (&process->head, 0, 0);
+	return 0;
+      }
+
+  return process->status_pending_p;
+}
+
+static void
+linux_wait_for_process (struct process_info **childp, int *wstatp)
+{
+  int ret;
+  int to_wait_for = -1;
+
+  if (*childp != NULL)
+    to_wait_for = (*childp)->lwpid;
+
+  while (1)
+    {
+      ret = waitpid (to_wait_for, wstatp, WNOHANG);
+
+      if (ret == -1)
+	{
+	  if (errno != ECHILD)
+	    perror_with_name ("waitpid");
+	}
+      else if (ret > 0)
+	break;
+
+      ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE);
+
+      if (ret == -1)
+	{
+	  if (errno != ECHILD)
+	    perror_with_name ("waitpid (WCLONE)");
+	}
+      else if (ret > 0)
+	break;
+
+      usleep (1000);
+    }
+
+  if (debug_threads
+      && (!WIFSTOPPED (*wstatp)
+	  || (WSTOPSIG (*wstatp) != 32
+	      && WSTOPSIG (*wstatp) != 33)))
+    fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp);
+
+  if (to_wait_for == -1)
+    *childp = (struct process_info *) find_inferior_id (&all_processes, ret);
+
+  (*childp)->stopped = 1;
+  (*childp)->pending_is_breakpoint = 0;
+
+  if (debug_threads
+      && WIFSTOPPED (*wstatp))
+    {
+      current_inferior = (struct thread_info *)
+	find_inferior_id (&all_threads, (*childp)->tid);
+      /* For testing only; i386_stop_pc prints out a diagnostic.  */
+      if (the_low_target.get_pc != NULL)
+	get_stop_pc ();
+    }
+}
+
+static int
+linux_wait_for_event (struct thread_info *child)
+{
+  CORE_ADDR stop_pc;
+  struct process_info *event_child;
+  int wstat;
+
+  /* Check for a process with a pending status.  */
+  /* It is possible that the user changed the pending task's registers since
+     it stopped.  We correctly handle the change of PC if we hit a breakpoint
+     (in check_removed_breakpoint); signals should be reported anyway.  */
+  if (child == NULL)
+    {
+      event_child = (struct process_info *)
+	find_inferior (&all_processes, status_pending_p, NULL);
+      if (debug_threads && event_child)
+	fprintf (stderr, "Got a pending child %d\n", event_child->lwpid);
+    }
+  else
+    {
+      event_child = get_thread_process (child);
+      if (event_child->status_pending_p
+	  && check_removed_breakpoint (event_child))
+	event_child = NULL;
+    }
+
+  if (event_child != NULL)
+    {
+      if (event_child->status_pending_p)
+	{
+	  if (debug_threads)
+	    fprintf (stderr, "Got an event from pending child %d (%04x)\n",
+		     event_child->lwpid, event_child->status_pending);
+	  wstat = event_child->status_pending;
+	  event_child->status_pending_p = 0;
+	  event_child->status_pending = 0;
+	  current_inferior = get_process_thread (event_child);
+	  return wstat;
+	}
+    }
+
+  /* We only enter this loop if no process has a pending wait status.  Thus
+     any action taken in response to a wait status inside this loop is
+     responding as soon as we detect the status, not after any pending
+     events.  */
+  while (1)
+    {
+      if (child == NULL)
+	event_child = NULL;
+      else
+	event_child = get_thread_process (child);
+
+      linux_wait_for_process (&event_child, &wstat);
+
+      if (event_child == NULL)
+	error ("event from unknown child");
+
+      current_inferior = (struct thread_info *)
+	find_inferior_id (&all_threads, event_child->tid);
+
+      if (using_threads)
+	{
+	  /* Check for thread exit.  */
+	  if (! WIFSTOPPED (wstat))
+	    {
+	      if (debug_threads)
+		fprintf (stderr, "Thread %d (LWP %d) exiting\n",
+			 event_child->tid, event_child->head.id);
+
+	      /* If the last thread is exiting, just return.  */
+	      if (all_threads.head == all_threads.tail)
+		return wstat;
+
+	      dead_thread_notify (event_child->tid);
+
+	      remove_inferior (&all_processes, &event_child->head);
+	      free (event_child);
+	      remove_thread (current_inferior);
+	      current_inferior = (struct thread_info *) all_threads.head;
+
+	      /* If we were waiting for this particular child to do something...
+		 well, it did something.  */
+	      if (child != NULL)
+		return wstat;
+
+	      /* Wait for a more interesting event.  */
+	      continue;
+	    }
+
+	  if (WIFSTOPPED (wstat)
+	      && WSTOPSIG (wstat) == SIGSTOP
+	      && event_child->stop_expected)
+	    {
+	      if (debug_threads)
+		fprintf (stderr, "Expected stop.\n");
+	      event_child->stop_expected = 0;
+	      linux_resume_one_process (&event_child->head,
+					event_child->stepping, 0);
+	      continue;
+	    }
+
+	  /* FIXME drow/2002-06-09: Get signal numbers from the inferior's
+	     thread library?  */
+	  if (WIFSTOPPED (wstat)
+	      && (WSTOPSIG (wstat) == __SIGRTMIN
+		  || WSTOPSIG (wstat) == __SIGRTMIN + 1))
+	    {
+	      if (debug_threads)
+		fprintf (stderr, "Ignored signal %d for %d (LWP %d).\n",
+			 WSTOPSIG (wstat), event_child->tid,
+			 event_child->head.id);
+	      linux_resume_one_process (&event_child->head,
+					event_child->stepping,
+					WSTOPSIG (wstat));
+	      continue;
+	    }
+	}
+
+      /* If this event was not handled above, and is not a SIGTRAP, report
+	 it.  */
+      if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGTRAP)
+	return wstat;
+
+      /* If this target does not support breakpoints, we simply report the
+	 SIGTRAP; it's of no concern to us.  */
+      if (the_low_target.get_pc == NULL)
+	return wstat;
+
+      stop_pc = get_stop_pc ();
+
+      /* bp_reinsert will only be set if we were single-stepping.
+	 Notice that we will resume the process after hitting
+	 a gdbserver breakpoint; single-stepping to/over one
+	 is not supported (yet).  */
+      if (event_child->bp_reinsert != 0)
+	{
+	  if (debug_threads)
+	    fprintf (stderr, "Reinserted breakpoint.\n");
+	  reinsert_breakpoint (event_child->bp_reinsert);
+	  event_child->bp_reinsert = 0;
+
+	  /* Clear the single-stepping flag and SIGTRAP as we resume.  */
+	  linux_resume_one_process (&event_child->head, 0, 0);
+	  continue;
+	}
+
+      if (debug_threads)
+	fprintf (stderr, "Hit a (non-reinsert) breakpoint.\n");
+
+      if (check_breakpoints (stop_pc) != 0)
+	{
+	  /* We hit one of our own breakpoints.  We mark it as a pending
+	     breakpoint, so that check_removed_breakpoint () will do the PC
+	     adjustment for us at the appropriate time.  */
+	  event_child->pending_is_breakpoint = 1;
+	  event_child->pending_stop_pc = stop_pc;
+
+	  /* Now we need to put the breakpoint back.  We continue in the event
+	     loop instead of simply replacing the breakpoint right away,
+	     in order to not lose signals sent to the thread that hit the
+	     breakpoint.  Unfortunately this increases the window where another
+	     thread could sneak past the removed breakpoint.  For the current
+	     use of server-side breakpoints (thread creation) this is
+	     acceptable; but it needs to be considered before this breakpoint
+	     mechanism can be used in more general ways.  For some breakpoints
+	     it may be necessary to stop all other threads, but that should
+	     be avoided where possible.
+
+	     If breakpoint_reinsert_addr is NULL, that means that we can
+	     use PTRACE_SINGLESTEP on this platform.  Uninsert the breakpoint,
+	     mark it for reinsertion, and single-step.
+
+	     Otherwise, call the target function to figure out where we need
+	     our temporary breakpoint, create it, and continue executing this
+	     process.  */
+	  if (the_low_target.breakpoint_reinsert_addr == NULL)
+	    {
+	      event_child->bp_reinsert = stop_pc;
+	      uninsert_breakpoint (stop_pc);
+	      linux_resume_one_process (&event_child->head, 1, 0);
+	    }
+	  else
+	    {
+	      reinsert_breakpoint_by_bp
+		(stop_pc, (*the_low_target.breakpoint_reinsert_addr) ());
+	      linux_resume_one_process (&event_child->head, 0, 0);
+	    }
+
+	  continue;
+	}
+
+      /* If we were single-stepping, we definitely want to report the
+	 SIGTRAP.  The single-step operation has completed, so also
+         clear the stepping flag; in general this does not matter,
+	 because the SIGTRAP will be reported to the client, which
+	 will give us a new action for this thread, but clear it for
+	 consistency anyway.  It's safe to clear the stepping flag
+         because the only consumer of get_stop_pc () after this point
+	 is check_removed_breakpoint, and pending_is_breakpoint is not
+	 set.  It might be wiser to use a step_completed flag instead.  */
+      if (event_child->stepping)
+	{
+	  event_child->stepping = 0;
+	  return wstat;
+	}
+
+      /* A SIGTRAP that we can't explain.  It may have been a breakpoint.
+	 Check if it is a breakpoint, and if so mark the process information
+	 accordingly.  This will handle both the necessary fiddling with the
+	 PC on decr_pc_after_break targets and suppressing extra threads
+	 hitting a breakpoint if two hit it at once and then GDB removes it
+	 after the first is reported.  Arguably it would be better to report
+	 multiple threads hitting breakpoints simultaneously, but the current
+	 remote protocol does not allow this.  */
+      if ((*the_low_target.breakpoint_at) (stop_pc))
+	{
+	  event_child->pending_is_breakpoint = 1;
+	  event_child->pending_stop_pc = stop_pc;
+	}
+
+      return wstat;
+    }
+
+  /* NOTREACHED */
+  return 0;
+}
+
+/* Wait for process, returns status.  */
+
+static unsigned char
+linux_wait (char *status)
+{
+  int w;
+  struct thread_info *child = NULL;
+
+retry:
+  /* If we were only supposed to resume one thread, only wait for
+     that thread - if it's still alive.  If it died, however - which
+     can happen if we're coming from the thread death case below -
+     then we need to make sure we restart the other threads.  We could
+     pick a thread at random or restart all; restarting all is less
+     arbitrary.  */
+  if (cont_thread > 0)
+    {
+      child = (struct thread_info *) find_inferior_id (&all_threads,
+						       cont_thread);
+
+      /* No stepping, no signal - unless one is pending already, of course.  */
+      if (child == NULL)
+	{
+	  struct thread_resume resume_info;
+	  resume_info.thread = -1;
+	  resume_info.step = resume_info.sig = resume_info.leave_stopped = 0;
+	  linux_resume (&resume_info);
+	}
+    }
+
+  enable_async_io ();
+  unblock_async_io ();
+  w = linux_wait_for_event (child);
+  stop_all_processes ();
+  disable_async_io ();
+
+  /* If we are waiting for a particular child, and it exited,
+     linux_wait_for_event will return its exit status.  Similarly if
+     the last child exited.  If this is not the last child, however,
+     do not report it as exited until there is a 'thread exited' response
+     available in the remote protocol.  Instead, just wait for another event.
+     This should be safe, because if the thread crashed we will already
+     have reported the termination signal to GDB; that should stop any
+     in-progress stepping operations, etc.
+
+     Report the exit status of the last thread to exit.  This matches
+     LinuxThreads' behavior.  */
+
+  if (all_threads.head == all_threads.tail)
+    {
+      if (WIFEXITED (w))
+	{
+	  fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
+	  *status = 'W';
+	  clear_inferiors ();
+	  free (all_processes.head);
+	  all_processes.head = all_processes.tail = NULL;
+	  return ((unsigned char) WEXITSTATUS (w));
+	}
+      else if (!WIFSTOPPED (w))
+	{
+	  fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
+	  *status = 'X';
+	  clear_inferiors ();
+	  free (all_processes.head);
+	  all_processes.head = all_processes.tail = NULL;
+	  return ((unsigned char) WTERMSIG (w));
+	}
+    }
+  else
+    {
+      if (!WIFSTOPPED (w))
+	goto retry;
+    }
+
+  *status = 'T';
+  return ((unsigned char) WSTOPSIG (w));
+}
+
+static void
+send_sigstop (struct inferior_list_entry *entry)
+{
+  struct process_info *process = (struct process_info *) entry;
+
+  if (process->stopped)
+    return;
+
+  /* If we already have a pending stop signal for this process, don't
+     send another.  */
+  if (process->stop_expected)
+    {
+      process->stop_expected = 0;
+      return;
+    }
+
+  if (debug_threads)
+    fprintf (stderr, "Sending sigstop to process %d\n", process->head.id);
+
+  kill (process->head.id, SIGSTOP);
+  process->sigstop_sent = 1;
+}
+
+static void
+wait_for_sigstop (struct inferior_list_entry *entry)
+{
+  struct process_info *process = (struct process_info *) entry;
+  struct thread_info *saved_inferior, *thread;
+  int wstat, saved_tid;
+
+  if (process->stopped)
+    return;
+
+  saved_inferior = current_inferior;
+  saved_tid = ((struct inferior_list_entry *) saved_inferior)->id;
+  thread = (struct thread_info *) find_inferior_id (&all_threads,
+						    process->tid);
+  wstat = linux_wait_for_event (thread);
+
+  /* If we stopped with a non-SIGSTOP signal, save it for later
+     and record the pending SIGSTOP.  If the process exited, just
+     return.  */
+  if (WIFSTOPPED (wstat)
+      && WSTOPSIG (wstat) != SIGSTOP)
+    {
+      if (debug_threads)
+	fprintf (stderr, "Stopped with non-sigstop signal\n");
+      process->status_pending_p = 1;
+      process->status_pending = wstat;
+      process->stop_expected = 1;
+    }
+
+  if (linux_thread_alive (saved_tid))
+    current_inferior = saved_inferior;
+  else
+    {
+      if (debug_threads)
+	fprintf (stderr, "Previously current thread died.\n");
+
+      /* Set a valid thread as current.  */
+      set_desired_inferior (0);
+    }
+}
+
+static void
+stop_all_processes (void)
+{
+  stopping_threads = 1;
+  for_each_inferior (&all_processes, send_sigstop);
+  for_each_inferior (&all_processes, wait_for_sigstop);
+  stopping_threads = 0;
+}
+
+/* Resume execution of the inferior process.
+   If STEP is nonzero, single-step it.
+   If SIGNAL is nonzero, give it that signal.  */
+
+static void
+linux_resume_one_process (struct inferior_list_entry *entry,
+			  int step, int signal)
+{
+  struct process_info *process = (struct process_info *) entry;
+  struct thread_info *saved_inferior;
+
+  if (process->stopped == 0)
+    return;
+
+  /* If we have pending signals or status, and a new signal, enqueue the
+     signal.  Also enqueue the signal if we are waiting to reinsert a
+     breakpoint; it will be picked up again below.  */
+  if (signal != 0
+      && (process->status_pending_p || process->pending_signals != NULL
+	  || process->bp_reinsert != 0))
+    {
+      struct pending_signals *p_sig;
+      p_sig = malloc (sizeof (*p_sig));
+      p_sig->prev = process->pending_signals;
+      p_sig->signal = signal;
+      process->pending_signals = p_sig;
+    }
+
+  if (process->status_pending_p && !check_removed_breakpoint (process))
+    return;
+
+  saved_inferior = current_inferior;
+  current_inferior = get_process_thread (process);
+
+  if (debug_threads)
+    fprintf (stderr, "Resuming process %d (%s, signal %d, stop %s)\n", inferior_pid,
+	     step ? "step" : "continue", signal,
+	     process->stop_expected ? "expected" : "not expected");
+
+  /* This bit needs some thinking about.  If we get a signal that
+     we must report while a single-step reinsert is still pending,
+     we often end up resuming the thread.  It might be better to
+     (ew) allow a stack of pending events; then we could be sure that
+     the reinsert happened right away and not lose any signals.
+
+     Making this stack would also shrink the window in which breakpoints are
+     uninserted (see comment in linux_wait_for_process) but not enough for
+     complete correctness, so it won't solve that problem.  It may be
+     worthwhile just to solve this one, however.  */
+  if (process->bp_reinsert != 0)
+    {
+      if (debug_threads)
+	fprintf (stderr, "  pending reinsert at %08lx", (long)process->bp_reinsert);
+      if (step == 0)
+	fprintf (stderr, "BAD - reinserting but not stepping.\n");
+      step = 1;
+
+      /* Postpone any pending signal.  It was enqueued above.  */
+      signal = 0;
+    }
+
+  check_removed_breakpoint (process);
+
+  if (debug_threads && the_low_target.get_pc != NULL)
+    {
+      fprintf (stderr, "  ");
+      (long) (*the_low_target.get_pc) ();
+    }
+
+  /* If we have pending signals, consume one unless we are trying to reinsert
+     a breakpoint.  */
+  if (process->pending_signals != NULL && process->bp_reinsert == 0)
+    {
+      struct pending_signals **p_sig;
+
+      p_sig = &process->pending_signals;
+      while ((*p_sig)->prev != NULL)
+	p_sig = &(*p_sig)->prev;
+
+      signal = (*p_sig)->signal;
+      free (*p_sig);
+      *p_sig = NULL;
+    }
+
+  regcache_invalidate_one ((struct inferior_list_entry *)
+			   get_process_thread (process));
+  errno = 0;
+  process->stopped = 0;
+  process->stepping = step;
+  ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, process->lwpid, 0, signal);
+
+  current_inferior = saved_inferior;
+  if (errno)
+    perror_with_name ("ptrace");
+}
+
+static struct thread_resume *resume_ptr;
+
+/* This function is called once per thread.  We look up the thread
+   in RESUME_PTR, and mark the thread with a pointer to the appropriate
+   resume request.
+
+   This algorithm is O(threads * resume elements), but resume elements
+   is small (and will remain small at least until GDB supports thread
+   suspension).  */
+static void
+linux_set_resume_request (struct inferior_list_entry *entry)
+{
+  struct process_info *process;
+  struct thread_info *thread;
+  int ndx;
+
+  thread = (struct thread_info *) entry;
+  process = get_thread_process (thread);
+
+  ndx = 0;
+  while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id)
+    ndx++;
+
+  process->resume = &resume_ptr[ndx];
+}
+
+/* This function is called once per thread.  We check the thread's resume
+   request, which will tell us whether to resume, step, or leave the thread
+   stopped; and what signal, if any, it should be sent.  For threads which
+   we aren't explicitly told otherwise, we preserve the stepping flag; this
+   is used for stepping over gdbserver-placed breakpoints.  */
+
+static void
+linux_continue_one_thread (struct inferior_list_entry *entry)
+{
+  struct process_info *process;
+  struct thread_info *thread;
+  int step;
+
+  thread = (struct thread_info *) entry;
+  process = get_thread_process (thread);
+
+  if (process->resume->leave_stopped)
+    return;
+
+  if (process->resume->thread == -1)
+    step = process->stepping || process->resume->step;
+  else
+    step = process->resume->step;
+
+  linux_resume_one_process (&process->head, step, process->resume->sig);
+
+  process->resume = NULL;
+}
+
+/* This function is called once per thread.  We check the thread's resume
+   request, which will tell us whether to resume, step, or leave the thread
+   stopped; and what signal, if any, it should be sent.  We queue any needed
+   signals, since we won't actually resume.  We already have a pending event
+   to report, so we don't need to preserve any step requests; they should
+   be re-issued if necessary.  */
+
+static void
+linux_queue_one_thread (struct inferior_list_entry *entry)
+{
+  struct process_info *process;
+  struct thread_info *thread;
+
+  thread = (struct thread_info *) entry;
+  process = get_thread_process (thread);
+
+  if (process->resume->leave_stopped)
+    return;
+
+  /* If we have a new signal, enqueue the signal.  */
+  if (process->resume->sig != 0)
+    {
+      struct pending_signals *p_sig;
+      p_sig = malloc (sizeof (*p_sig));
+      p_sig->prev = process->pending_signals;
+      p_sig->signal = process->resume->sig;
+      process->pending_signals = p_sig;
+    }
+
+  process->resume = NULL;
+}
+
+/* Set DUMMY if this process has an interesting status pending.  */
+static int
+resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
+{
+  struct process_info *process = (struct process_info *) entry;
+
+  /* Processes which will not be resumed are not interesting, because
+     we might not wait for them next time through linux_wait.  */
+  if (process->resume->leave_stopped)
+    return 0;
+
+  /* If this thread has a removed breakpoint, we won't have any
+     events to report later, so check now.  check_removed_breakpoint
+     may clear status_pending_p.  We avoid calling check_removed_breakpoint
+     for any thread that we are not otherwise going to resume - this
+     lets us preserve stopped status when two threads hit a breakpoint.
+     GDB removes the breakpoint to single-step a particular thread
+     past it, then re-inserts it and resumes all threads.  We want
+     to report the second thread without resuming it in the interim.  */
+  if (process->status_pending_p)
+    check_removed_breakpoint (process);
+
+  if (process->status_pending_p)
+    * (int *) flag_p = 1;
+
+  return 0;
+}
+
+static void
+linux_resume (struct thread_resume *resume_info)
+{
+  int pending_flag;
+
+  /* Yes, the use of a global here is rather ugly.  */
+  resume_ptr = resume_info;
+
+  for_each_inferior (&all_threads, linux_set_resume_request);
+
+  /* If there is a thread which would otherwise be resumed, which
+     has a pending status, then don't resume any threads - we can just
+     report the pending status.  Make sure to queue any signals
+     that would otherwise be sent.  */
+  pending_flag = 0;
+  find_inferior (&all_processes, resume_status_pending_p, &pending_flag);
+
+  if (debug_threads)
+    {
+      if (pending_flag)
+	fprintf (stderr, "Not resuming, pending status\n");
+      else
+	fprintf (stderr, "Resuming, no pending status\n");
+    }
+
+  if (pending_flag)
+    for_each_inferior (&all_threads, linux_queue_one_thread);
+  else
+    {
+      block_async_io ();
+      enable_async_io ();
+      for_each_inferior (&all_threads, linux_continue_one_thread);
+    }
+}
+
+#ifdef HAVE_LINUX_USRREGS
+
+int
+register_addr (int regnum)
+{
+  int addr;
+
+  if (regnum < 0 || regnum >= the_low_target.num_regs)
+    error ("Invalid register number %d.", regnum);
+
+  addr = the_low_target.regmap[regnum];
+
+  return addr;
+}
+
+/* Fetch one register.  */
+static void
+fetch_register (int regno)
+{
+  CORE_ADDR regaddr;
+  register int i;
+  char *buf;
+
+  if (regno >= the_low_target.num_regs)
+    return;
+  if ((*the_low_target.cannot_fetch_register) (regno))
+    return;
+
+  regaddr = register_addr (regno);
+  if (regaddr == -1)
+    return;
+  buf = alloca (register_size (regno));
+  for (i = 0; i < register_size (regno); i += sizeof (PTRACE_XFER_TYPE))
+    {
+      errno = 0;
+      *(PTRACE_XFER_TYPE *) (buf + i) =
+	ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0);
+      regaddr += sizeof (PTRACE_XFER_TYPE);
+      if (errno != 0)
+	{
+	  /* Warning, not error, in case we are attached; sometimes the
+	     kernel doesn't let us at the registers.  */
+	  char *err = strerror (errno);
+	  char *msg = alloca (strlen (err) + 128);
+	  sprintf (msg, "reading register %d: %s", regno, err);
+	  error (msg);
+	  goto error_exit;
+	}
+    }
+  supply_register (regno, buf);
+
+error_exit:;
+}
+
+/* Fetch all registers, or just one, from the child process.  */
+static void
+usr_fetch_inferior_registers (int regno)
+{
+  if (regno == -1 || regno == 0)
+    for (regno = 0; regno < the_low_target.num_regs; regno++)
+      fetch_register (regno);
+  else
+    fetch_register (regno);
+}
+
+/* Store our register values back into the inferior.
+   If REGNO is -1, do this for all registers.
+   Otherwise, REGNO specifies which register (so we can save time).  */
+static void
+usr_store_inferior_registers (int regno)
+{
+  CORE_ADDR regaddr;
+  int i;
+  char *buf;
+
+  if (regno >= 0)
+    {
+      if (regno >= the_low_target.num_regs)
+	return;
+
+      if ((*the_low_target.cannot_store_register) (regno) == 1)
+	return;
+
+      regaddr = register_addr (regno);
+      if (regaddr == -1)
+	return;
+      errno = 0;
+      buf = alloca (register_size (regno));
+      collect_register (regno, buf);
+      for (i = 0; i < register_size (regno); i += sizeof (PTRACE_XFER_TYPE))
+	{
+	  errno = 0;
+	  ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
+		  *(PTRACE_XFER_TYPE *) (buf + i));
+	  if (errno != 0)
+	    {
+	      if ((*the_low_target.cannot_store_register) (regno) == 0)
+		{
+		  char *err = strerror (errno);
+		  char *msg = alloca (strlen (err) + 128);
+		  sprintf (msg, "writing register %d: %s",
+			   regno, err);
+		  error (msg);
+		  return;
+		}
+	    }
+	  regaddr += sizeof (PTRACE_XFER_TYPE);
+	}
+    }
+  else
+    for (regno = 0; regno < the_low_target.num_regs; regno++)
+      usr_store_inferior_registers (regno);
+}
+#endif /* HAVE_LINUX_USRREGS */
+
+
+
+#ifdef HAVE_LINUX_REGSETS
+
+static int
+regsets_fetch_inferior_registers ()
+{
+  struct regset_info *regset;
+
+  regset = target_regsets;
+
+  while (regset->size >= 0)
+    {
+      void *buf;
+      int res;
+
+      if (regset->size == 0)
+	{
+	  regset ++;
+	  continue;
+	}
+
+      buf = malloc (regset->size);
+      res = ptrace (regset->get_request, inferior_pid, 0, buf);
+      if (res < 0)
+	{
+	  if (errno == EIO)
+	    {
+	      /* If we get EIO on the first regset, do not try regsets again.
+		 If we get EIO on a later regset, disable that regset.  */
+	      if (regset == target_regsets)
+		{
+		  use_regsets_p = 0;
+		  return -1;
+		}
+	      else
+		{
+		  regset->size = 0;
+		  continue;
+		}
+	    }
+	  else
+	    {
+	      char s[256];
+	      sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%d",
+		       inferior_pid);
+	      perror (s);
+	    }
+	}
+      regset->store_function (buf);
+      regset ++;
+    }
+  return 0;
+}
+
+static int
+regsets_store_inferior_registers ()
+{
+  struct regset_info *regset;
+
+  regset = target_regsets;
+
+  while (regset->size >= 0)
+    {
+      void *buf;
+      int res;
+
+      if (regset->size == 0)
+	{
+	  regset ++;
+	  continue;
+	}
+
+      buf = malloc (regset->size);
+      regset->fill_function (buf);
+      res = ptrace (regset->set_request, inferior_pid, 0, buf);
+      if (res < 0)
+	{
+	  if (errno == EIO)
+	    {
+	      /* If we get EIO on the first regset, do not try regsets again.
+		 If we get EIO on a later regset, disable that regset.  */
+	      if (regset == target_regsets)
+		{
+		  use_regsets_p = 0;
+		  return -1;
+		}
+	      else
+		{
+		  regset->size = 0;
+		  continue;
+		}
+	    }
+	  else
+	    {
+	      perror ("Warning: ptrace(regsets_store_inferior_registers)");
+	    }
+	}
+      regset ++;
+      free (buf);
+    }
+  return 0;
+}
+
+#endif /* HAVE_LINUX_REGSETS */
+
+
+void
+linux_fetch_registers (int regno)
+{
+#ifdef HAVE_LINUX_REGSETS
+  if (use_regsets_p)
+    {
+      if (regsets_fetch_inferior_registers () == 0)
+	return;
+    }
+#endif
+#ifdef HAVE_LINUX_USRREGS
+  usr_fetch_inferior_registers (regno);
+#endif
+}
+
+void
+linux_store_registers (int regno)
+{
+#ifdef HAVE_LINUX_REGSETS
+  if (use_regsets_p)
+    {
+      if (regsets_store_inferior_registers () == 0)
+	return;
+    }
+#endif
+#ifdef HAVE_LINUX_USRREGS
+  usr_store_inferior_registers (regno);
+#endif
+}
+
+
+/* Copy LEN bytes from inferior's memory starting at MEMADDR
+   to debugger memory starting at MYADDR.  */
+
+static int
+linux_read_memory (CORE_ADDR memaddr, char *myaddr, int len)
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+    = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+      / sizeof (PTRACE_XFER_TYPE);
+  /* Allocate buffer of that many longwords.  */
+  register PTRACE_XFER_TYPE *buffer
+    = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+
+  /* Read all the longwords */
+  for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+    {
+      errno = 0;
+      buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
+      if (errno)
+	return errno;
+    }
+
+  /* Copy appropriate bytes out of the buffer.  */
+  memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len);
+
+  return 0;
+}
+
+/* Copy LEN bytes of data from debugger memory at MYADDR
+   to inferior's memory at MEMADDR.
+   On failure (cannot write the inferior)
+   returns the value of errno.  */
+
+static int
+linux_write_memory (CORE_ADDR memaddr, const char *myaddr, int len)
+{
+  register int i;
+  /* Round starting address down to longword boundary.  */
+  register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
+  /* Round ending address up; get number of longwords that makes.  */
+  register int count
+  = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
+  /* Allocate buffer of that many longwords.  */
+  register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+  extern int errno;
+
+  if (debug_threads)
+    {
+      fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr);
+    }
+
+  /* Fill start and end extra bytes of buffer with existing memory data.  */
+
+  buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid,
+		      (PTRACE_ARG3_TYPE) addr, 0);
+
+  if (count > 1)
+    {
+      buffer[count - 1]
+	= ptrace (PTRACE_PEEKTEXT, inferior_pid,
+		  (PTRACE_ARG3_TYPE) (addr + (count - 1)
+				      * sizeof (PTRACE_XFER_TYPE)),
+		  0);
+    }
+
+  /* Copy data to be written over corresponding part of buffer */
+
+  memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
+
+  /* Write the entire buffer.  */
+
+  for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
+    {
+      errno = 0;
+      ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
+      if (errno)
+	return errno;
+    }
+
+  return 0;
+}
+
+static void
+linux_look_up_symbols (void)
+{
+#ifdef USE_THREAD_DB
+  if (using_threads)
+    return;
+
+  using_threads = thread_db_init ();
+#endif
+}
+
+static void
+linux_send_signal (int signum)
+{
+  extern int signal_pid;
+
+  if (cont_thread > 0)
+    {
+      struct process_info *process;
+
+      process = get_thread_process (current_inferior);
+      kill (process->lwpid, signum);
+    }
+  else
+    kill (signal_pid, signum);
+}
+
+/* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
+   to debugger memory starting at MYADDR.  */
+
+static int
+linux_read_auxv (CORE_ADDR offset, char *myaddr, unsigned int len)
+{
+  char filename[PATH_MAX];
+  int fd, n;
+
+  snprintf (filename, sizeof filename, "/proc/%d/auxv", inferior_pid);
+
+  fd = open (filename, O_RDONLY);
+  if (fd < 0)
+    return -1;
+
+  if (offset != (CORE_ADDR) 0
+      && lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
+    n = -1;
+  else
+    n = read (fd, myaddr, len);
+
+  close (fd);
+
+  return n;
+}
+
+
+static struct target_ops linux_target_ops = {
+  linux_create_inferior,
+  linux_attach,
+  linux_kill,
+  linux_detach,
+  linux_thread_alive,
+  linux_resume,
+  linux_wait,
+  linux_fetch_registers,
+  linux_store_registers,
+  linux_read_memory,
+  linux_write_memory,
+  linux_look_up_symbols,
+  linux_send_signal,
+  linux_read_auxv,
+};
+
+static void
+linux_init_signals ()
+{
+  /* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
+     to find what the cancel signal actually is.  */
+  signal (__SIGRTMIN+1, SIG_IGN);
+}
+
+void
+initialize_low (void)
+{
+  using_threads = 0;
+  set_target_ops (&linux_target_ops);
+  set_breakpoint_data (the_low_target.breakpoint,
+		       the_low_target.breakpoint_len);
+  init_registers ();
+  linux_init_signals ();
+}
diff --git a/gnu/usr.bin/gdb/gdbserver/fbsd-low.h b/gnu/usr.bin/gdb/gdbserver/fbsd-low.h
new file mode 100644
index 0000000..d42c9b5
--- /dev/null
+++ b/gnu/usr.bin/gdb/gdbserver/fbsd-low.h
@@ -0,0 +1,120 @@
+/* Internal interfaces for the GNU/Linux specific target code for gdbserver.
+   Copyright 2002, 2004 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.  */
+
+#ifdef HAVE_LINUX_REGSETS
+typedef void (*regset_fill_func) (void *);
+typedef void (*regset_store_func) (const void *);
+enum regset_type {
+  GENERAL_REGS,
+  FP_REGS,
+  EXTENDED_REGS,
+};
+
+struct regset_info
+{
+  int get_request, set_request;
+  int size;
+  enum regset_type type;
+  regset_fill_func fill_function;
+  regset_store_func store_function;
+};
+extern struct regset_info target_regsets[];
+#endif
+
+struct linux_target_ops
+{
+  int num_regs;
+  int *regmap;
+  int (*cannot_fetch_register) (int);
+
+  /* Returns 0 if we can store the register, 1 if we can not
+     store the register, and 2 if failure to store the register
+     is acceptable.  */
+  int (*cannot_store_register) (int);
+  CORE_ADDR (*get_pc) (void);
+  void (*set_pc) (CORE_ADDR newpc);
+  const char *breakpoint;
+  int breakpoint_len;
+  CORE_ADDR (*breakpoint_reinsert_addr) (void);
+
+
+  int decr_pc_after_break;
+  int (*breakpoint_at) (CORE_ADDR pc);
+};
+
+extern struct linux_target_ops the_low_target;
+
+#define get_process(inf) ((struct process_info *)(inf))
+#define get_thread_process(thr) (get_process (inferior_target_data (thr)))
+#define get_process_thread(proc) ((struct thread_info *) \
+				  find_inferior_id (&all_threads, \
+				  get_process (proc)->tid))
+
+struct process_info
+{
+  struct inferior_list_entry head;
+  int thread_known;
+  int lwpid;
+  int tid;
+
+  /* If this flag is set, the next SIGSTOP will be ignored (the process will
+     be immediately resumed).  */
+  int stop_expected;
+
+  /* If this flag is set, the process is known to be stopped right now (stop
+     event already received in a wait()).  */
+  int stopped;
+
+  /* If this flag is set, we have sent a SIGSTOP to this process and are
+     waiting for it to stop.  */
+  int sigstop_sent;
+
+  /* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
+     been reported.  */
+  int status_pending_p;
+  int status_pending;
+
+  /* If this flag is set, the pending status is a (GDB-placed) breakpoint.  */
+  int pending_is_breakpoint;
+  CORE_ADDR pending_stop_pc;
+
+  /* If this is non-zero, it is a breakpoint to be reinserted at our next
+     stop (SIGTRAP stops only).  */
+  CORE_ADDR bp_reinsert;
+
+  /* If this flag is set, the last continue operation on this process
+     was a single-step.  */
+  int stepping;
+
+  /* If this is non-zero, it points to a chain of signals which need to
+     be delivered to this process.  */
+  struct pending_signals *pending_signals;
+
+  /* A link used when resuming.  It is initialized from the resume request,
+     and then processed and cleared in linux_resume_one_process.  */
+
+  struct thread_resume *resume;
+};
+
+extern struct inferior_list all_processes;
+
+void linux_attach_lwp (int pid, int tid);
+
+int thread_db_init (void);