[CRIS] Don't internal error if forced big endian

This fixes:

  $ ./gdb -q -ex "set endian big" -ex "set architecture cris"
  The target is assumed to be big endian
  .../src/gdb/cris-tdep.c:4051: internal-error: cris_gdbarch_init: big endian byte order in info
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n)

The "set cris-version" command can likewise cause internal errors.

The gdbarch init routine should be returning 0 to reject the
architecture instead of internal erroring on user input.

gdb/ChangeLog:
2016-03-09  Pedro Alves  <palves@redhat.com>

	* cris-tdep.c (cris_gdbarch_init): Return 0 if the info's byte
	order is BFD_ENDIAN_BIG or if the cris version is unsupported.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 1718ff1..a6414c1 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2016-03-09  Pedro Alves  <palves@redhat.com>
 
+       * cris-tdep.c (cris_gdbarch_init): Return 0 if the info's byte
+       order is BFD_ENDIAN_BIG or if the cris version is unsupported.
+
+2016-03-09  Pedro Alves  <palves@redhat.com>
+
        * doublest.c: Extend comments.
        (floatformat_to_doublest, floatformat_from_doublest): Copy the
        floatformat's total size, not the host type's size.

diff --git a/gdb/cris-tdep.c b/gdb/cris-tdep.c
index 971ee9f..d350ce8 100644 (file)
--- a/gdb/cris-tdep.c
+++ b/gdb/cris-tdep.c
@@ -4048,10 +4048,10 @@ cris_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
       break;
 
     case BFD_ENDIAN_BIG:
-      internal_error (__FILE__, __LINE__,
-                     _("cris_gdbarch_init: big endian byte order in info"));
-      break;
-    
+      /* Cris is always little endian, but the user could have forced
+        big endian with "set endian".  */
+      return 0;
+
     default:
       internal_error (__FILE__, __LINE__,
                      _("cris_gdbarch_init: unknown byte order in info"));
@@ -4083,9 +4083,7 @@ cris_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
     case 8:
     case 9:
       /* Old versions; not supported.  */
-      internal_error (__FILE__, __LINE__, 
-                     _("cris_gdbarch_init: unsupported CRIS version"));
-      break;
+      return 0;
 
     case 10:
     case 11: 
@@ -4125,8 +4123,8 @@ cris_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
       break;
 
     default:
-      internal_error (__FILE__, __LINE__, 
-                     _("cris_gdbarch_init: unknown CRIS version"));
+      /* Unknown version.  */
+      return 0;
     }
 
   /* Dummy frame functions (shared between CRISv10 and CRISv32 since they