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diff --git a/gdb/config/nm-m3.h b/gdb/config/nm-m3.h
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+/* Mach 3.0 common definitions and global vars.
+
+   Copyright (C) 1992 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.  */
+
+#ifndef NM_M3_H
+#define NM_M3_H
+
+#include <mach.h>
+
+/* Mach3 doesn't declare errno in <errno.h>.  */
+extern int errno;
+
+/* Task port of our debugged inferior. */
+
+extern task_t inferior_task;
+
+/* Thread port of the current thread in the inferior. */
+
+extern thread_t current_thread;
+
+/* If nonzero, we must suspend/abort && resume threads
+ * when setting or getting the state.
+ */
+extern int must_suspend_thread;
+
+#define PREPARE_TO_PROCEED(select_it) mach3_prepare_to_proceed(select_it)
+
+/* Try to get the privileged host port for authentication to machid
+ *
+ * If you can get this, you may debug anything on this host.
+ *
+ * If you can't, gdb gives it's own task port as the
+ * authentication port
+ */
+#define  mach_privileged_host_port() task_by_pid(-1)
+
+/*
+ * This is the MIG ID number of the emulator/server bsd_execve() RPC call.
+ *
+ * It SHOULD never change, but if it does, gdb `run'
+ * command won't work until you fix this define.
+ * 
+ */
+#define MIG_EXEC_SYSCALL_ID		101000
+
+/* If our_message_port gets a msg with this ID,
+ * GDB suspends it's inferior and enters command level.
+ * (Useful at least if ^C does not work)
+ */
+#define GDB_MESSAGE_ID_STOP			0x41151
+
+/* wait3 WNOHANG is defined in <sys/wait.h> but
+ * for some reason gdb does not want to include
+ * that file.
+ *
+ * If your system defines WNOHANG differently, this has to be changed.
+ */
+#define WNOHANG 1
+
+/* Before storing, we need to read all the registers.  */
+
+#define CHILD_PREPARE_TO_STORE() read_register_bytes (0, NULL, REGISTER_BYTES)
+
+/* Check if the inferior exists */
+#define MACH_ERROR_NO_INFERIOR \
+  do if (!MACH_PORT_VALID (inferior_task)) \
+  	error ("Inferior task does not exist."); while(0)
+
+/* Error handler for mach calls */
+#define CHK(str,ret)	\
+  do if (ret != KERN_SUCCESS) \
+       error ("Gdb %s [%d] %s : %s\n",__FILE__,__LINE__,str, \
+	      mach_error_string(ret)); while(0)
+
+/* This is from POE9 emulator/emul_stack.h
+ */
+/*
+ * Top of emulator stack holds link and reply port.
+ */
+struct emul_stack_top {
+	struct emul_stack_top	*link;
+	mach_port_t		reply_port;
+};
+
+#define EMULATOR_STACK_SIZE (4096*4)
+
+#define THREAD_ALLOWED_TO_BREAK(mid) mach_thread_for_breakpoint (mid)
+
+#define THREAD_PARSE_ID(arg) mach_thread_parse_id (arg)
+
+#define THREAD_OUTPUT_ID(mid) mach_thread_output_id (mid)
+
+#define ATTACH_TO_THREAD attach_to_thread
+
+/* Don't do wait_for_inferior on attach.  */
+#define ATTACH_NO_WAIT
+
+/* Do Mach 3 dependent operations when ^C or a STOP is requested */
+#define DO_QUIT() mach3_quit ()
+
+#if 0
+/* This is bogus.  It is NOT OK to quit out of target_wait.  */
+/* If in mach_msg() and ^C is typed set immediate_quit */
+#define REQUEST_QUIT() mach3_request_quit ()
+#endif
+
+#endif /* NM_M3_H */