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gdb: Workaround bad gdbserver qSupported:xmlRegisters=i386;UnknwnFeat+ handling

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gdbserver's target_process_qsupported is called for each feature that
the gdbserver common code does not recognize.  The only current
implementation, for x86 Linux, does this:

  static void
  x86_linux_process_qsupported (const char *query)
  {
    /* Return if gdb doesn't support XML.  If gdb sends "xmlRegisters="
       with "i386" in qSupported query, it supports x86 XML target
       descriptions.  */
    use_xml = 0;
    if (query != NULL && startswith (query, "xmlRegisters="))
      {
	char *copy = xstrdup (query + 13);
	char *p;

	for (p = strtok (copy, ","); p != NULL; p = strtok (NULL, ","))
	  {
	    if (strcmp (p, "i386") == 0)
	      {
		use_xml = 1;
		break;
	      }
	  }

	free (copy);
      }

    x86_linux_update_xmltarget ();
  }

Notice that this clears use_xml and calls x86_linux_update_xmltarget
each time target_process_qsupported is called.  So if gdb sends in any
unknown feature after "xmlRegisters=i386", like e.g.,
"xmlRegisters=i386;UnknownFeature+" gdbserver ends up not reporting a
XML description...

Work around this by having GDB send the "xmlRegisters=" feature last.

gdb/ChangeLog:
2015-11-19  Pedro Alves  <palves@redhat.com>

	* remote.c (remote_query_supported): Send the "xmlRegisters="
	feature last.
This commit is contained in:
Pedro Alves 2015-11-19 18:31:49 +00:00
parent bb82e93484
commit b35d5edb03
2 changed files with 10 additions and 3 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2015-11-19 Pedro Alves <palves@redhat.com>
* remote.c (remote_query_supported): Send the "xmlRegisters="
feature last.
2015-11-19 Simon Marchi <simon.marchi@ericsson.com>
* nat/aarch64-linux-hw-point.c (aarch64_linux_set_debug_regs): Change

8
gdb/remote.c
View File

@ -4467,9 +4467,6 @@ remote_query_supported (void)
if (packet_set_cmd_state (PACKET_hwbreak_feature) != AUTO_BOOLEAN_FALSE)
q = remote_query_supported_append (q, "hwbreak+");
if (remote_support_xml)
q = remote_query_supported_append (q, remote_support_xml);
q = remote_query_supported_append (q, "qRelocInsn+");
if (rs->extended)
@ -4488,6 +4485,11 @@ remote_query_supported (void)
if (packet_set_cmd_state (PACKET_vContSupported) != AUTO_BOOLEAN_FALSE)
q = remote_query_supported_append (q, "vContSupported+");
/* Keep this one last to work around a gdbserver <= 7.10 bug in
the qSupported:xmlRegisters=i386 handling. */
if (remote_support_xml != NULL)
q = remote_query_supported_append (q, remote_support_xml);
q = reconcat (q, "qSupported:", q, (char *) NULL);
putpkt (q);