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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 4082afcc3d 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(-)
This commit is contained in:
Pedro Alves 2017-12-06 11:28:47 +00:00
parent 846fefbdb2
commit 7cc244debb
4 changed files with 46 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
gdb/ChangeLog
View File

@ -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

16
gdb/remote.c
View File

@ -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);

5
gdb/testsuite/ChangeLog
View File

@ -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

25
gdb/testsuite/gdb.arch/i386-avx.exp
View File

@ -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.*"
}
}