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diff --git a/gdb/config/i386/tm-i386v4.h b/gdb/config/i386/tm-i386v4.h
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+++ b/gdb/config/i386/tm-i386v4.h
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+/* Macro definitions for GDB on an Intel i386 running SVR4.
+   Copyright (C) 1991, 1994 Free Software Foundation, Inc.
+   Written by Fred Fish at Cygnus Support (fnf@cygnus.com)
+
+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 TM_I386V4_H
+#define TM_I386V4_H 1
+
+/* Pick up most of what we need from the generic i386 target include file. */
+
+#include "i386/tm-i386.h"
+
+/* Pick up more stuff from the generic SVR4 host include file. */
+
+#include "tm-sysv4.h"
+
+/* Use the alternate method of determining valid frame chains. */
+
+#define FRAME_CHAIN_VALID(fp,fi) alternate_frame_chain_valid (fp, fi)
+
+/* Offsets (in target ints) into jmp_buf.  Not defined in any system header
+   file, so we have to step through setjmp/longjmp with a debugger and figure
+   them out.  Note that <setjmp> defines _JBLEN as 10, which is the default
+   if no specific machine is selected, even though we only use 6 slots. */
+
+#define JB_ELEMENT_SIZE sizeof(int)	/* jmp_buf[_JBLEN] is array of ints */
+
+#define JB_EBX	0
+#define JB_ESI	1
+#define JB_EDI	2
+#define JB_EBP	3
+#define JB_ESP	4
+#define JB_EDX	5
+
+#define JB_PC	JB_EDX	/* Setjmp()'s return PC saved in EDX */
+
+/* Figure out where the longjmp will land.  Slurp the args out of the stack.
+   We expect the first arg to be a pointer to the jmp_buf structure from which
+   we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
+   This routine returns true on success */
+
+extern int
+get_longjmp_target PARAMS ((CORE_ADDR *));
+
+#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
+
+/* The following redefines make backtracing through sigtramp work.
+   They manufacture a fake sigtramp frame and obtain the saved pc in sigtramp
+   from the ucontext structure which is pushed by the kernel on the
+   user stack. Unfortunately there are three variants of sigtramp handlers.  */
+
+#define I386V4_SIGTRAMP_SAVED_PC
+#define IN_SIGTRAMP(pc, name) ((name)					\
+			       && (STREQ ("_sigreturn", name)		\
+				   || STREQ ("_sigacthandler", name)	\
+				   || STREQ ("sigvechandler", name)))
+
+/* Saved Pc.  Get it from ucontext if within sigtramp.  */
+
+#define sigtramp_saved_pc i386v4_sigtramp_saved_pc
+extern CORE_ADDR i386v4_sigtramp_saved_pc PARAMS ((struct frame_info *));
+
+#endif  /* ifndef TM_I386V4_H */