[PATCH 14/15 v2] Introduce get_thread_regcache_for_ptid

[Gary Benson <gbenson@redhat.com>]

This introduces get_thread_regcache_for_ptid so that we can simplify
nat/linux-btrace.c.  A better long term solution would be unify the
regcache code, but this is sufficient for now.

gdb/
2014-07-16  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* common/common-regcache.h: New file.
	* regcache.c: Include the above.
	(get_thread_regcache_for_ptid): New function.
	* nat/linux-btrace.c: Include common-regcache.h.
	(perf_event_read_bts): Use get_thread_regcache_for_ptid.

gdb/gdbserver/
2014-07-16  Tom Tromey  <tromey@redhat.com>
	    Gary Benson  <gbenson@redhat.com>

	* regcache.c: Include common-regcache.h.
	(get_thread_regcache_for_ptid): New function.
---
 gdb/ChangeLog                |    9 +++++++++
 gdb/common/common-regcache.h |   28 ++++++++++++++++++++++++++++
 gdb/gdbserver/ChangeLog      |    6 ++++++
 gdb/gdbserver/regcache.c     |    9 +++++++++
 gdb/nat/linux-btrace.c       |    7 ++-----
 gdb/regcache.c               |    8 ++++++++
 6 files changed, 62 insertions(+), 5 deletions(-)
 create mode 100644 gdb/common/common-regcache.h

diff --git a/gdb/common/common-regcache.h b/gdb/common/common-regcache.h
new file mode 100644
index 0000000..2ef7cb1
--- /dev/null
+++ b/gdb/common/common-regcache.h
@@ -0,0 +1,28 @@
+/* Cache and manage the values of registers
+
+   Copyright (C) 1986-2014 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
+
+/* A hack until we have an independent regcache.  This must be
+   provided by the user.  */
+
+extern struct regcache *get_thread_regcache_for_ptid (ptid_t ptid);
+
+#endif /* COMMON_REGCACHE_H */
diff --git a/gdb/gdbserver/regcache.c b/gdb/gdbserver/regcache.c
index bed10b4..eb72322 100644
--- a/gdb/gdbserver/regcache.c
+++ b/gdb/gdbserver/regcache.c
@@ -21,6 +21,7 @@
 #include "gdbthread.h"
 #include "tdesc.h"
 #include "rsp-low.h"
+#include "common-regcache.h"
 
 #include <stdlib.h>
 #include <string.h>
@@ -65,6 +66,14 @@ get_thread_regcache (struct thread_info *thread, int fetch)
   return regcache;
 }
 
+/* See common/linux-btrace.h.  */
+
+struct regcache *
+get_thread_regcache_for_ptid (ptid_t ptid)
+{
+  return get_thread_regcache (find_thread_ptid (ptid), 1);
+}
+
 void
 regcache_invalidate_thread (struct thread_info *thread)
 {
diff --git a/gdb/nat/linux-btrace.c b/gdb/nat/linux-btrace.c
index 188220b..3b4180f 100644
--- a/gdb/nat/linux-btrace.c
+++ b/gdb/nat/linux-btrace.c
@@ -32,6 +32,7 @@
 #include "gdbthread.h"
 #include "gdb_wait.h"
 #include "i386-cpuid.h"
+#include "common-regcache.h"
 
 #ifdef HAVE_SYS_SYSCALL_H
 #include <sys/syscall.h>
@@ -184,11 +185,7 @@ perf_event_read_bts (struct btrace_target_info* tinfo, const uint8_t *begin,
   gdb_assert (start <= end);
 
   /* The first block ends at the current pc.  */
-#ifdef GDBSERVER
-  regcache = get_thread_regcache (find_thread_ptid (tinfo->ptid), 1);
-#else
-  regcache = get_thread_regcache (tinfo->ptid);
-#endif
+  regcache = get_thread_regcache_for_ptid (tinfo->ptid);
   block.end = regcache_read_pc (regcache);
 
   /* The buffer may contain a partial record as its last entry (i.e. when the
diff --git a/gdb/regcache.c b/gdb/regcache.c
index 5ee90b0..e66a40e 100644
--- a/gdb/regcache.c
+++ b/gdb/regcache.c
@@ -30,6 +30,7 @@
 #include "exceptions.h"
 #include "remote.h"
 #include "valprint.h"
+#include "common-regcache.h"
 
 /*
  * DATA STRUCTURE
@@ -537,6 +538,13 @@ get_current_regcache (void)
   return get_thread_regcache (inferior_ptid);
 }
 
+/* See common/linux-btrace.h.  */
+
+struct regcache *
+get_thread_regcache_for_ptid (ptid_t ptid)
+{
+  return get_thread_regcache (ptid);
+}
 
 /* Observer for the target_changed event.  */
 
-- 
1.7.1