AArch64: Ensure regcache is reset between tests

A recent change made the AArch64 self tests resuse the saved regs
cache, rather than creating a new one.  Ensure it is reset to default
values between tests.

Do this by splitting the reset functionality from trad_frame_alloc_saved_regs
into a new function.

Fixes selftest on AArch64.

gdb/ChangeLog:

	* aarch64-tdep.c (aarch64_analyze_prologue_test): Reset saved regs.
	* trad-frame.c (trad_frame_reset_saved_regs): New function.
	(trad_frame_alloc_saved_regs): Call trad_frame_reset_saved_regs.
	* trad-frame.h (trad_frame_reset_saved_regs): New declaration.

1 files changed, 15 insertions, 6 deletions

diff --git a/gdb/trad-frame.c b/gdb/trad-frame.c
index 3cb2953..d911475 100644
--- a/gdb/trad-frame.c
+++ b/gdb/trad-frame.c
@@ -44,19 +44,28 @@ trad_frame_cache_zalloc (struct frame_info *this_frame)
   return this_trad_cache;
 }
 
+/* See trad-frame.h.  */
+
+void
+trad_frame_reset_saved_regs (struct gdbarch *gdbarch,
+			     struct trad_frame_saved_reg *regs)
+{
+  int numregs = gdbarch_num_cooked_regs (gdbarch);
+  for (int regnum = 0; regnum < numregs; regnum++)
+    {
+      regs[regnum].realreg = regnum;
+      regs[regnum].addr = -1;
+    }
+}
+
 struct trad_frame_saved_reg *
 trad_frame_alloc_saved_regs (struct gdbarch *gdbarch)
 {
-  int regnum;
   int numregs = gdbarch_num_cooked_regs (gdbarch);
   struct trad_frame_saved_reg *this_saved_regs
     = FRAME_OBSTACK_CALLOC (numregs, struct trad_frame_saved_reg);
 
-  for (regnum = 0; regnum < numregs; regnum++)
-    {
-      this_saved_regs[regnum].realreg = regnum;
-      this_saved_regs[regnum].addr = -1;
-    }      
+  trad_frame_reset_saved_regs (gdbarch, this_saved_regs);
   return this_saved_regs;
 }