[3/3] Warn if core file register section is larger than expected

diff --git a/gdb/alphanbsd-tdep.c b/gdb/alphanbsd-tdep.c
index 6b13fad..69be265 100644
--- a/gdb/alphanbsd-tdep.c
+++ b/gdb/alphanbsd-tdep.c
@@ -145,7 +145,9 @@  alphanbsd_supply_gregset (const struct regset *regset,
 static const struct regset alphanbsd_gregset =
 {
   NULL,
-  alphanbsd_supply_gregset
+  alphanbsd_supply_gregset,
+  NULL,
+  REGSET_VARIABLE_SIZE
 };
 
 static const struct regset alphanbsd_fpregset =
diff --git a/gdb/armbsd-tdep.c b/gdb/armbsd-tdep.c
index 7923cad..c043b51 100644
--- a/gdb/armbsd-tdep.c
+++ b/gdb/armbsd-tdep.c
@@ -98,7 +98,9 @@  armbsd_supply_gregset (const struct regset *regset,
 static const struct regset armbsd_gregset =
 {
   NULL,
-  armbsd_supply_gregset
+  armbsd_supply_gregset,
+  NULL,
+  REGSET_VARIABLE_SIZE
 };
 
 static const struct regset armbsd_fpregset =
diff --git a/gdb/corelow.c b/gdb/corelow.c
index a9eadd5..12cbcba 100644
--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -523,6 +523,11 @@  get_core_register_section (struct regcache *regcache,
       warning (_("Section `%s' in core file too small."), section_name);
       return;
     }
+  if (size != min_size && !(regset->flags & REGSET_VARIABLE_SIZE))
+    {
+      warning (_("Unexpected size of section `%s' in core file."),
+	       section_name);
+    }
 
   contents = alloca (size);
   if (! bfd_get_section_contents (core_bfd, section, contents,
diff --git a/gdb/hppa-hpux-tdep.c b/gdb/hppa-hpux-tdep.c
index 0c8575d..3c0f390 100644
--- a/gdb/hppa-hpux-tdep.c
+++ b/gdb/hppa-hpux-tdep.c
@@ -1367,7 +1367,9 @@  hppa_hpux_supply_save_state (const struct regset *regset,
 static const struct regset hppa_hpux_regset =
 {
   NULL,
-  hppa_hpux_supply_save_state
+  hppa_hpux_supply_save_state,
+  NULL,
+  REGSET_VARIABLE_SIZE
 };
 
 static void
diff --git a/gdb/hppaobsd-tdep.c b/gdb/hppaobsd-tdep.c
index 9ec7fdf..c9bc1bf 100644
--- a/gdb/hppaobsd-tdep.c
+++ b/gdb/hppaobsd-tdep.c
@@ -131,7 +131,9 @@  hppaobsd_supply_fpregset (const struct regset *regset,
 static const struct regset hppaobsd_gregset =
 {
   NULL,
-  hppaobsd_supply_gregset
+  hppaobsd_supply_gregset,
+  NULL,
+  REGSET_VARIABLE_SIZE
 };
 
 static const struct regset hppaobsd_fpregset =
diff --git a/gdb/m68kbsd-tdep.c b/gdb/m68kbsd-tdep.c
index b1ae4c1..ae0cecf 100644
--- a/gdb/m68kbsd-tdep.c
+++ b/gdb/m68kbsd-tdep.c
@@ -105,7 +105,9 @@  m68kbsd_supply_gregset (const struct regset *regset,
 static const struct regset m68kbsd_gregset =
 {
   NULL,
-  m68kbsd_supply_gregset
+  m68kbsd_supply_gregset,
+  NULL,
+  REGSET_VARIABLE_SIZE
 };
 
 static const struct regset m68kbsd_fpregset =
diff --git a/gdb/mipsnbsd-tdep.c b/gdb/mipsnbsd-tdep.c
index ee68f3d..d15c88c 100644
--- a/gdb/mipsnbsd-tdep.c
+++ b/gdb/mipsnbsd-tdep.c
@@ -103,7 +103,9 @@  mipsnbsd_supply_gregset (const struct regset *regset,
 static const struct regset mipsnbsd_gregset =
 {
   NULL,
-  mipsnbsd_supply_gregset
+  mipsnbsd_supply_gregset,
+  NULL,
+  REGSET_VARIABLE_SIZE
 };
 
 static const struct regset mipsnbsd_fpregset =
diff --git a/gdb/regset.h b/gdb/regset.h
index 3585322..d6edaa5 100644
--- a/gdb/regset.h
+++ b/gdb/regset.h
@@ -43,6 +43,13 @@  struct regset
 
   /* Function collecting values in a register set from a register cache.  */
   collect_regset_ftype *collect_regset;
+
+  unsigned flags;
 };
 
+/* Values for a regset's 'flags' field.  */
+
+#define REGSET_VARIABLE_SIZE 1	/* Accept a larger regset section size
+				   in a core file without warning.  */
+
 #endif /* regset.h */