Preparation for new siginfo on Linux

First add new structure and function to allow architecture customization
for the siginfo structure.

2016-01-15  Walfred Tedeschi  <walfred.tedeschi@intel.com>

gdb/ChangeLog:

	* linux-tdep.h (linux_siginfo_extra_field_values): New enum values.
	(linux_siginfo_extra_fields): New enum type.
	* linux-tdep.c (linux_get_siginfo_type_with_fields): New function.
	(linux_get_siginfo_type): Use new function.

gdb/ChangeLog

@@ -1,3 +1,10 @@
+2016-02-02  Walfred Tedeschi  <walfred.tedeschi@intel.com>
+
+	* linux-tdep.h (linux_siginfo_extra_field_values): New enum values.
+	(linux_siginfo_extra_fields): New enum type.
+	* linux-tdep.c (linux_get_siginfo_type_with_fields): New function.
+	(linux_get_siginfo_type): Use new function.
+
 2016-02-02  Walfred Tedeschi  <walfred.tedeschi@intel.com>
 
 	* nat/amd64-linux-siginfo.c: New file.

gdb/linux-tdep.c

@@ -243,11 +243,12 @@ get_linux_inferior_data (void)
   return info;
 }
 
-/* This function is suitable for architectures that don't
+/* This function is suitable for architectures that
-   extend/override the standard siginfo structure.  */
+   extend/override the standard siginfo in a specific way.  */
 
 static struct type *
-linux_get_siginfo_type (struct gdbarch *gdbarch)
+linux_get_siginfo_type_with_fields (struct gdbarch *gdbarch,
+				    linux_siginfo_extra_fields extra_fields)
 {
   struct linux_gdbarch_data *linux_gdbarch_data;
   struct type *int_type, *uint_type, *long_type, *void_ptr_type;
@@ -364,6 +365,15 @@ linux_get_siginfo_type (struct gdbarch *gdbarch)
   return siginfo_type;
 }
 
+/* This function is suitable for architectures that don't
+   extend/override the standard siginfo structure.  */
+
+static struct type *
+linux_get_siginfo_type (struct gdbarch *gdbarch)
+{
+  return linux_get_siginfo_type_with_fields (gdbarch, 0);
+}
+
 /* Return true if the target is running on uClinux instead of normal
    Linux kernel.  */
 

gdb/linux-tdep.h

@@ -24,6 +24,18 @@
 
 struct regcache;
 
+/* Enum used to define the extra fields of the siginfo type used by an
+   architecture.  */
+enum linux_siginfo_extra_field_values
+{
+  /* Add bound fields into the segmentation fault field.  */
+  LINUX_SIGINFO_FIELD_ADDR_BND = 1
+};
+
+/* Defines a type for the values defined in linux_siginfo_extra_field_values.  */
+DEF_ENUM_FLAGS_TYPE (enum linux_siginfo_extra_field_values,
+		     linux_siginfo_extra_fields);
+
 typedef char *(*linux_collect_thread_registers_ftype) (const struct regcache *,
 						       ptid_t,
 						       bfd *, char *, int *,