commit 3e1a70a0189ae8d2dacfef93790e42e42e721762
Author: Sergio Lopez <slp@redhat.com>
Date:   Mon Dec 4 09:17:16 2017 +0100

    Extend gdb.core/coredump-filter.exp to test dump-excluded-mappings.
    
    gdb/testsuite/ChangeLog:
    2017-11-30  Sergio Lopez  <slp@redhat.com>
    
            * gdb.core/coredump-filter.exp: Extend test to verify
            the functionality of the dump-excluded-mappings command.

Index: gdb-7.6.1/gdb/testsuite/gdb.base/coredump-filter.exp
===================================================================
--- gdb-7.6.1.orig/gdb/testsuite/gdb.base/coredump-filter.exp	2017-12-06 20:59:21.016161086 +0100
+++ gdb-7.6.1/gdb/testsuite/gdb.base/coredump-filter.exp	2017-12-06 21:03:20.445710226 +0100
@@ -95,16 +95,26 @@
     return -1
 }
 
-proc do_save_core { filter_flag core ipid } {
+proc do_save_core { filter_flag core ipid dump_excluded } {
     verbose -log "writing $filter_flag to /proc/$ipid/coredump_filter"
 
     remote_exec target "sh -c \"echo $filter_flag > /proc/$ipid/coredump_filter\""
 
+    # Enable dumping of excluded mappings (i.e. VM_DONTDUMP).
+    if { $dump_excluded == 1 } {
+        gdb_test_no_output "set dump-excluded-mappings on"
+    }
+
     # Generate a corefile.
     gdb_gcore_cmd "$core" "save corefile"
+
+    # Restore original status.
+    if { $dump_excluded == 1 } {
+        gdb_test_no_output "set dump-excluded-mappings off"
+    }
 }
 
-proc do_load_and_test_core { core var working_var working_value } {
+proc do_load_and_test_core { core var working_var working_value dump_excluded } {
     global hex decimal addr
 
     set core_loaded [gdb_core_cmd "$core" "load core"]
@@ -114,10 +124,16 @@
     }
 
     # Access the memory the addresses point to.
-    gdb_test "print/x *(char *) $addr($var)" "\(\\\$$decimal = <error: \)?Cannot access memory at address $hex\(>\)?" \
-	"printing $var when core is loaded (should not work)"
-    gdb_test "print/x *(char *) $addr($working_var)" " = $working_value.*" \
-	"print/x *$working_var ( = $working_value)"
+    if { $dump_excluded == 0 } {
+	gdb_test "print/x *(char *) $addr($var)" "\(\\\$$decimal = <error: \)?Cannot access memory at address $hex\(>\)?" \
+	    "printing $var when core is loaded (should not work)"
+	gdb_test "print/x *(char *) $addr($working_var)" " = $working_value.*" \
+	    "print/x *$working_var ( = $working_value)"
+    } else {
+        # Check if VM_DONTDUMP mappings are present in the core file.
+        gdb_test "print/x *(char *) $addr($var)" " = $working_value.*" \
+	    "print/x *$var ( = $working_value)"
+    }
 }
 
 # We do not do file-backed mappings in the test program, but it is
@@ -169,6 +185,7 @@
 # A corefile without {private,shared} {anonymous,file-backed} pages
 set non_private_shared_anon_file_core [standard_output_file non-private-shared-anon-file.gcore]
 set dont_dump_core [standard_output_file dont-dump.gcore]
+set dump_excluded_core [standard_output_file dump-excluded.gcore]
 
 # We will generate a few corefiles.
 #
@@ -184,6 +201,8 @@
 # - name of a variable in the C source code that points to a memory
 #   mapping that WILL be present in the corefile
 # - corresponding value expected for the above variable
+# - whether to include mappings marked as VM_DONTDUMP in the
+#   corefile (1) or not (0).
 #
 # This list refers to the corefiles generated by MAP_ANONYMOUS in the
 # test program.
@@ -191,13 +210,16 @@
 set all_anon_corefiles { { "non-Private-Anonymous" "0x7e" \
 			       $non_private_anon_core \
 			       "private_anon" \
-			       "shared_anon" "0x22" }
+			       "shared_anon" "0x22" "0" }
     { "non-Shared-Anonymous" "0x7d" \
 	  $non_shared_anon_core "shared_anon" \
-	  "private_anon" "0x11" }
+	  "private_anon" "0x11" "0" }
     { "DoNotDump" "0x33" \
 	  $dont_dump_core "dont_dump" \
-	  "shared_anon" "0x22" } }
+	  "shared_anon" "0x22" "0" }
+    { "DoNotDump-DumpExcluded" "0x33" \
+	  $dump_excluded_core "dont_dump" \
+	  "shared_anon" "0x55" "1" } }
 
 # If corefile loading is not supported, we do not even try to run the
 # tests.
@@ -239,12 +261,12 @@
 # Generate corefiles for the "anon" case.
 foreach item $all_anon_corefiles {
     with_test_prefix "saving corefile for [lindex $item 0]" {
-	do_save_core [lindex $item 1] [subst [lindex $item 2]] $infpid
+	do_save_core [lindex $item 1] [subst [lindex $item 2]] $infpid [lindex $item 6]
     }
 }
 
 with_test_prefix "saving corefile for non-Private-Shared-Anon-File" {
-    do_save_core "0x60" $non_private_shared_anon_file_core $infpid
+    do_save_core "0x60" $non_private_shared_anon_file_core $infpid "0"
 }
 
 clean_restart $testfile
@@ -252,7 +274,7 @@
 foreach item $all_anon_corefiles {
     with_test_prefix "loading and testing corefile for [lindex $item 0]" {
 	do_load_and_test_core [subst [lindex $item 2]] [lindex $item 3] \
-	    [lindex $item 4] [lindex $item 5]
+	    [lindex $item 4] [lindex $item 5] [lindex $item 6]
     }
 
     with_test_prefix "disassembling function main for [lindex $item 0]" {