commit 289e23aa03084b22c73ebdcf18371f1e6666ead0
Author: Andreas Arnez <arnez@linux.vnet.ibm.com>
Date:   Mon Sep 25 16:02:24 2017 +0200

    S390: Document guarded-storage register support
    
    This documents the newly added support for guarded-storage registers on
    IBM z.
    
    gdb/ChangeLog:
    
    	* NEWS: Advertise support for guarded-storage registers on IBM z.
    
    gdb/doc/ChangeLog:
    
    	* gdb.texinfo (S/390 and System z Features): Document the new
    	features org.gnu.gdb.s390.gs and org.gnu.gdb.s390.gsbc.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6eb730f..b6283f6 100644
diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
index a3612db..3e74640 100644
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 6b32089..9905ff6 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -41857,6 +41857,14 @@ through @samp{f15} to present the 128-bit wide vector registers
 contain the 128-bit wide vector registers @samp{v16} through
 @samp{v31}.
 
+The @samp{org.gnu.gdb.s390.gs} feature is optional.  It should contain
+the 64-bit wide guarded-storage-control registers @samp{gsd},
+@samp{gssm}, and @samp{gsepla}.
+
+The @samp{org.gnu.gdb.s390.gsbc} feature is optional.  It should contain
+the 64-bit wide guarded-storage broadcast control registers
+@samp{bc_gsd}, @samp{bc_gssm}, and @samp{bc_gsepla}.
+
 @node Sparc Features
 @subsection Sparc Features
 @cindex target descriptions, sparc32 features