Introduce common-regcache.h

This introduces common-regcache.h.  This contains two functions that
allow nat/linux-btrace.c to be simplified.  A better long term
solution would be unify the regcache code, but this is sufficient for
now.

gdb/ChangeLog:

	* common/common-regcache.h: New file.
	* Makefile.in (HFILES_NO_SRCDIR): Add common/common-regcache.h.
	* regcache.h: Include common-regcache.h.
	(regcache_read_pc): Don't declare.
	* regcache.c (get_thread_regcache_for_ptid): New function.
	* nat/linux-btrace.c: Don't include regcache.h.
	Include common-regcache.h.
	(perf_event_read_bts): Use get_thread_regcache_for_ptid.

gdb/gdbserver/ChangeLog:

	* regcache.h: Include common-regcache.h.
	(regcache_read_pc): Don't declare.
	* regcache.c (get_thread_regcache_for_ptid): New function.

1 files changed, 36 insertions, 0 deletions

diff --git a/gdb/common/common-regcache.h b/gdb/common/common-regcache.h
new file mode 100644
index 0000000..2825c7f
--- /dev/null
+++ b/gdb/common/common-regcache.h
@@ -0,0 +1,36 @@
+/* Cache and manage the values of registers
+
+   Copyright (C) 2014 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_REGCACHE_H
+#define COMMON_REGCACHE_H
+
+/* This header is a stopgap until we have an independent regcache.  */
+
+/* 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);
+
+/* Read the PC register.  This function must be provided by the
+   client.  */
+
+extern CORE_ADDR regcache_read_pc (struct regcache *regcache);
+
+#endif /* COMMON_REGCACHE_H */