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diff --git a/gdb/gdbsupport/common-regcache.h b/gdb/gdbsupport/common-regcache.h
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+++ b/gdb/gdbsupport/common-regcache.h
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+/* Cache and manage the values of registers
+
+   Copyright (C) 2014-2019 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 3 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, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef COMMON_COMMON_REGCACHE_H
+#define COMMON_COMMON_REGCACHE_H
+
+/* This header is a stopgap until we have an independent regcache.  */
+
+enum register_status : signed char
+  {
+    /* The register value is not in the cache, and we don't know yet
+       whether it's available in the target (or traceframe).  */
+    REG_UNKNOWN = 0,
+
+    /* The register value is valid and cached.  */
+    REG_VALID = 1,
+
+    /* The register value is unavailable.  E.g., we're inspecting a
+       traceframe, and this register wasn't collected.  Note that this
+       is different a different "unavailable" from saying the register
+       does not exist in the target's architecture --- in that case,
+       the target should have given us a target description that does
+       not include the register in the first place.  */
+    REG_UNAVAILABLE = -1
+  };
+
+/* Return a pointer to the register cache associated with the
+   thread specified by PTID.  This function must be provided by
+   the client.  */
+
+extern struct regcache *get_thread_regcache_for_ptid (ptid_t ptid);
+
+/* Return the size of register numbered N in REGCACHE.  This function
+   must be provided by the client.  */
+
+extern int regcache_register_size (const struct regcache *regcache, int n);
+
+/* Read the PC register.  This function must be provided by the
+   client.  */
+
+extern CORE_ADDR regcache_read_pc (struct regcache *regcache);
+
+/* Read a raw register into a unsigned integer.  */
+extern enum register_status regcache_raw_read_unsigned
+  (struct regcache *regcache, int regnum, ULONGEST *val);
+
+ULONGEST regcache_raw_get_unsigned (struct regcache *regcache, int regnum);
+
+struct reg_buffer_common
+{
+  virtual ~reg_buffer_common () = default;
+
+  /* Get the availability status of the value of register REGNUM in this
+     buffer.  */
+  virtual register_status get_register_status (int regnum) const = 0;
+
+  /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE.  */
+  virtual void raw_supply (int regnum, const void *buf) = 0;
+
+  /* Collect register REGNUM from REGCACHE and store its contents in BUF.  */
+  virtual void raw_collect (int regnum, void *buf) const = 0;
+
+  /* Compare the contents of the register stored in the regcache (ignoring the
+     first OFFSET bytes) to the contents of BUF (without any offset).  Returns
+     true if the same.  */
+  virtual bool raw_compare (int regnum, const void *buf, int offset) const = 0;
+};
+
+#endif /* COMMON_COMMON_REGCACHE_H */