diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index d5ea8ea511..25a3fb0c92 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -6,6 +6,7 @@ Sun Jul 18 15:22:45 1993  Jim Kingdon  (kingdon@rtl.cygnus.com)
 	[_SEQUENT_] (ptx_coff_regno_to_gdb, register_addr): New functions.
 	A few miscellaneous cleanups.
 	* symm-nat.c: Renamed from symm-xdep.c.
+	* All symmetry dependent files: Many changes.
 
 	* mips-tdep.c (mips_skip_prologue): New argument lenient.
 	Use read_memory_nobpt.
diff --git a/gdb/config/i386/nm-symmetry.h b/gdb/config/i386/nm-symmetry.h
new file mode 100644
index 0000000000..96cd4d1fdb
--- /dev/null
+++ b/gdb/config/i386/nm-symmetry.h
@@ -0,0 +1,44 @@
+/* Definitions to make GDB run on a Sequent Symmetry under dynix 3.0,
+   with Weitek 1167 and i387 support.
+   Copyright 1986, 1987, 1989, 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#ifdef _SEQUENT_
+/* ptx */
+#define PTRACE_READ_REGS(pid,regaddr) mptrace (XPT_RREGS, (pid), (regaddr), 0)
+#define PTRACE_WRITE_REGS(pid,regaddr) \
+  mptrace (XPT_WREGS, (pid), (regadddr), 0)
+#else
+/* dynix */
+#define PTRACE_READ_REGS(pid,regaddr) ptrace (XPT_RREGS, (pid), (regaddr), 0)
+#define PTRACE_WRITE_REGS(pid,regaddr) \
+  ptrace (XPT_WREGS, (pid), (regadddr), 0)
+#endif
+
+/* Override copies of {fetch,store}_inferior_registers in infptrace.c.  */
+
+#define FETCH_INFERIOR_REGISTERS
+
+/* This is the amount to subtract from u.u_ar0
+   to get the offset in the core file of the register values.  */
+
+#ifdef _SEQUENT_
+#define KERNEL_U_ADDR (0xffffe000) /* VA_UBLOCK */	/* ptx */
+#else
+#define KERNEL_U_ADDR (0x80000000 - (UPAGES * NBPG))	/* dynix */
+#endif
diff --git a/gdb/config/i386/ptx.mh b/gdb/config/i386/ptx.mh
new file mode 100644
index 0000000000..cd2bedda92
--- /dev/null
+++ b/gdb/config/i386/ptx.mh
@@ -0,0 +1,7 @@
+# Host: Sequent Symmetry running ptx 1.3, with Weitek 1167 or i387.
+XDEPFILES= infptrace.o inftarg.o fork-child.o symm-nat.o corelow.o
+XM_FILE= xm-symmetry.h
+NAT_FILE= nm-symmetry.h
+XM_CLIBS= -lPW -lseq
+REGEX=regex.o
+REGEX1=regex.o