remote: Make qXfer packets respect corresponding "set remote foo-packet"

I've noticed that "set remote target-features-packet off" before
connecting has no effect -- GDB still fetches a target description
anyway.

The problem is that while most "set remote foo-packet" commands were
fixed by:

  From 4082afcc3d1af9d8063d1c8e02deb34a8b97a489 Mon Sep 17 00:00:00 2001
  From: Pedro Alves <palves@redhat.com>
  Date: Fri, 25 Apr 2014 18:07:02 +0100
  Subject: [PATCH] Fix several "set remote foo-packet on/off" commands.
  <https://sourceware.org/ml/gdb-patches/2014-04/msg00006.html>

the "qXfer" packets where missed.  This commit fixes that.

I've changed remote_search_memory too for consistency (seems like
those are the last direct references to packet->support), though the
difference is not observable because the qSearch:memory packet is auto
probed.  Note gdb.base/find-unmapped.exp already exercises explicit
"set remote search-memory-packet off".

gdb/ChangeLog:
2017-12-06  Pedro Alves  <palves@redhat.com>

	* remote.c (remote_query_supported): Don't send "xmlRegisters=" if
	"qXfer:features:read"" is disabled.
	(remote_write_qxfer, remote_read_qxfer, remote_search_memory):
	Check packet_config_support instead of packet->support directly.

gdb/testsuite/ChangeLog:
2017-12-06  Pedro Alves  <palves@redhat.com>

	* gdb.arch/i386-avx.exp: If testing with a RSP target, check
	force-disabling XML descriptions.
--

 gdb/remote.c                        |   16 +++++++++-------
 gdb/testsuite/gdb.arch/i386-avx.exp |   25 +++++++++++++++++++++++++
 2 files changed, 34 insertions(+), 7 deletions(-)

4 files changed, 46 insertions, 7 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 657f87b..93acc17 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,10 @@
+2017-12-06  Pedro Alves  <palves@redhat.com>
+
+	* remote.c (remote_query_supported): Don't send "xmlRegisters=" if
+	"qXfer:features:read"" is disabled.
+	(remote_write_qxfer, remote_read_qxfer, remote_search_memory):
+	Check packet_config_support instead of packet->support directly.
+
 2017-12-05  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* target-descriptions.c (struct tdesc_feature) <registers>: Use
diff --git a/gdb/remote.c b/gdb/remote.c
index be2c65b..306cc1e 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -4745,7 +4745,8 @@ remote_query_supported (void)
 
       /* Keep this one last to work around a gdbserver <= 7.10 bug in
 	 the qSupported:xmlRegisters=i386 handling.  */
-      if (remote_support_xml != NULL)
+      if (remote_support_xml != NULL
+	  && packet_support (PACKET_qXfer_features) != PACKET_DISABLE)
 	q = remote_query_supported_append (q, remote_support_xml);
 
       q = reconcat (q, "qSupported:", q, (char *) NULL);
@@ -10302,7 +10303,7 @@ remote_write_qxfer (struct target_ops *ops, const char *object_name,
   struct remote_state *rs = get_remote_state ();
   int max_size = get_memory_write_packet_size (); 
 
-  if (packet->support == PACKET_DISABLE)
+  if (packet_config_support (packet) == PACKET_DISABLE)
     return TARGET_XFER_E_IO;
 
   /* Insert header.  */
@@ -10344,7 +10345,7 @@ remote_read_qxfer (struct target_ops *ops, const char *object_name,
   struct remote_state *rs = get_remote_state ();
   LONGEST i, n, packet_len;
 
-  if (packet->support == PACKET_DISABLE)
+  if (packet_config_support (packet) == PACKET_DISABLE)
     return TARGET_XFER_E_IO;
 
   /* Check whether we've cached an end-of-object packet that matches
@@ -10656,9 +10657,10 @@ remote_search_memory (struct target_ops* ops,
   int found;
   ULONGEST found_addr;
 
-  /* Don't go to the target if we don't have to.
-     This is done before checking packet->support to avoid the possibility that
-     a success for this edge case means the facility works in general.  */
+  /* Don't go to the target if we don't have to.  This is done before
+     checking packet_config_support to avoid the possibility that a
+     success for this edge case means the facility works in
+     general.  */
   if (pattern_len > search_space_len)
     return 0;
   if (pattern_len == 0)
@@ -10703,7 +10705,7 @@ remote_search_memory (struct target_ops* ops,
     {
       /* The request may not have worked because the command is not
 	 supported.  If so, fall back to the simple way.  */
-      if (packet->support == PACKET_DISABLE)
+      if (packet_config_support (packet) == PACKET_DISABLE)
 	{
 	  return simple_search_memory (ops, start_addr, search_space_len,
 				       pattern, pattern_len, found_addrp);
diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index 30ab10c..326af54 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2017-12-06  Pedro Alves  <palves@redhat.com>
+
+	* gdb.arch/i386-avx.exp: If testing with a RSP target, check
+	force-disabling XML descriptions.
+
 2017-12-04  Pedro Alves  <palves@redhat.com>
 
 	PR gdb/22499
diff --git a/gdb/testsuite/gdb.arch/i386-avx.exp b/gdb/testsuite/gdb.arch/i386-avx.exp
index 012c3ce..ca96c00 100644
--- a/gdb/testsuite/gdb.arch/i386-avx.exp
+++ b/gdb/testsuite/gdb.arch/i386-avx.exp
@@ -97,3 +97,28 @@ for { set r 0 } { $r < $nr_regs } { incr r } {
         ".. = \\{f = \\{[expr $r + 10], $r.125, $r.25, $r.375, $r.5, $r.625, $r.75, $r.875\\}\\}.*" \
         "check contents of data\[$r\]"
 }
+
+# If testing with a remote protocol target, check that we can
+# force-disable the use of XML descriptions.  This should make the
+# client/server fallback to the pre-XML register file.
+
+with_test_prefix "force-disable xml descriptions" {
+    if {[target_info gdb_protocol] == "remote"
+	|| [target_info gdb_protocol] == "extended-remote"} {
+
+	save_vars { GDBFLAGS } {
+	    append GDBFLAGS " -ex \"set remote target-features-packet off\""
+	    clean_restart ${binfile}
+	}
+
+	if ![runto_main] then {
+	    fail "run to main"
+	    return
+	}
+
+	# With qXfer:features:read disabled, we won't know anything
+	# about YMM registers.
+	gdb_test "print \$ymm0" " = void"
+	gdb_test "print \$xmm0" "v4_float.*"
+    }
+}