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Pedro Alves 5a04c4cf5d gdbserver: Leave already-vCont-resumed threads as they were
Currently GDB never sends more than one action per vCont packet, when
connected in non-stop mode.  A follow up patch will change that, and
it exposed a gdbserver problem with the vCont handling.

For example, this in non-stop mode:

  => vCont;s:p1.1;c
  <= OK

Should be equivalent to:

  => vCont;s:p1.1
  <= OK
  => vCont;c
  <= OK

But gdbserver currently doesn't handle this.  In the latter case,
"vCont;c" makes gdbserver clobber the previous step request.  This
patch fixes that.

Note the server side must ignore resume actions for the thread that
has a pending %Stopped notification (and any other threads with events
pending), until GDB acks the notification with vStopped.  Otherwise,
e.g., the following case is mishandled:

 #1 => g  (or any other packet)
 #2 <= [registers]
 #3 <= %Stopped T05 thread:p1.2
 #4 => vCont s:p1.1;c
 #5 <= OK

Above, the server must not resume thread p1.2 when it processes the
vCont.  GDB can't know that p1.2 stopped until it acks the %Stopped
notification.  (Otherwise it wouldn't send a default "c" action.)

(The vCont documentation already specifies this.)

Finally, special care must also be given to handling fork/vfork
events.  A (v)fork event actually tells us that two processes stopped
-- the parent and the child.  Until we follow the fork, we must not
resume the child.  Therefore, if we have a pending fork follow, we
must not send a global wildcard resume action (vCont;c).  We can still
send process-wide wildcards though.

(The comments above will be added as code comments to gdb in a follow
up patch.)

gdb/gdbserver/ChangeLog:
2016-10-26  Pedro Alves  <palves@redhat.com>

	* linux-low.c (handle_extended_wait): Link parent/child fork
	threads.
	(linux_wait_1): Unlink them.
	(linux_set_resume_request): Ignore resume requests for
	already-resumed and unhandled fork child threads.
	* linux-low.h (struct lwp_info) <fork_relative>: New field.
	* server.c (in_queued_stop_replies_ptid, in_queued_stop_replies):
	New functions.
	(handle_v_requests) <vCont>: Don't call require_running.
	* server.h (in_queued_stop_replies): New declaration.
2016-10-26 16:22:27 +01:00
bfd Automatic date update in version.in 2016-10-26 00:00:19 +00:00
binutils Remove spurious whitespace introduced by previous delta. 2016-10-19 14:37:21 +01:00
config Sync top level files with gcc. 2016-02-10 10:54:29 +00:00
cpu Add fall through comment to source in cpu/ 2016-10-06 22:48:37 +10:30
elfcpp Add support for MIPS .rld_map section. 2016-06-20 12:16:26 -07:00
etc Fix compile time warning messages building with gcc v6.1.1 2016-06-13 10:49:26 +01:00
gas Revert "bison warning fixes" 2016-10-26 11:45:50 +10:30
gdb gdbserver: Leave already-vCont-resumed threads as they were 2016-10-26 16:22:27 +01:00
gold Fix PR 17704. 2016-10-21 11:10:46 -07:00
gprof Remove redundant assignment in gprof. 2016-10-06 12:51:47 +01:00
include Update list of ELF machine numbers. 2016-10-17 11:46:32 +01:00
intl Regen intl/configure 2015-08-31 12:53:36 +09:30
ld Regenerate spu_ovl.o_c 2016-10-15 12:53:57 +10:30
libdecnumber Remove leading/trailing white spaces in ChangeLog 2015-07-24 04:16:47 -07:00
libiberty Sync libiberty sources with gcc mainline. 2016-10-17 10:26:56 +01:00
opcodes X86: Remove pcommit instruction 2016-10-21 12:16:32 -07:00
readline Improve MinGW support in Readline 2016-09-17 11:50:37 +03:00
sim sim: avr: move changelog entries to subdir 2016-10-18 01:04:53 -04:00
texinfo * texinfo/texinfo.tex: Update to version 2009-03-28.05. 2009-04-21 12:36:46 +00:00
zlib Regenerate configure 2016-05-09 17:24:30 +09:30
.cvsignore
.gitattributes
.gitignore Add archives and make stamps to the .gitignore file. 2016-09-27 15:10:42 +01:00
COPYING
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
COPYING3
COPYING3.LIB
ChangeLog Add archives and make stamps to the .gitignore file. 2016-09-27 15:10:42 +01:00
MAINTAINERS Update description of ownership of files in include/ 2014-11-04 16:14:14 -08:00
Makefile.def Sync top-level Makefile.def with GCC 2016-01-12 08:34:40 -08:00
Makefile.in Add dependencies to configure rule 2016-05-28 22:36:04 +09:30
Makefile.tpl Add dependencies to configure rule 2016-05-28 22:36:04 +09:30
README
README-maintainer-mode
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
config-ml.in Sync toplevel files with GCC 2015-07-27 07:49:05 -07:00
config.guess Fix typo introduced during the most recent synchronization update. 2016-05-27 14:34:06 +01:00
config.rpath
config.sub Sync config.guess and config.sub with FSF GCC mainline versions 2016-05-23 11:42:17 +01:00
configure Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
configure.ac Enable the configuration of GDB for the NDS32 target. 2016-07-20 09:06:39 +01:00
depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Sync top-level btool.m4 with GCC 2016-01-12 08:44:52 -08:00
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
lt~obsolete.m4
makefile.vms
missing Update from upstream Automake 2014-11-16 13:43:48 +01:00
mkdep
mkinstalldirs Update from upstream Automake 2014-11-16 13:43:48 +01:00
move-if-change Update `move-if-change' from gnulib 2014-11-16 17:04:02 +01:00
setup.com
src-release.sh fix gdb version parsing in src-release.sh 2016-01-17 10:01:55 +04:00
symlink-tree
ylwrap Update from upstream Automake 2014-11-16 13:43:48 +01:00

README

		   README for GNU development tools

This directory contains various GNU compilers, assemblers, linkers, 
debuggers, etc., plus their support routines, definitions, and documentation.

If you are receiving this as part of a GDB release, see the file gdb/README.
If with a binutils release, see binutils/README;  if with a libg++ release,
see libg++/README, etc.  That'll give you info about this
package -- supported targets, how to use it, how to report bugs, etc.

It is now possible to automatically configure and build a variety of
tools with one command.  To build all of the tools contained herein,
run the ``configure'' script here, e.g.:

	./configure 
	make

To install them (by default in /usr/local/bin, /usr/local/lib, etc),
then do:
	make install

(If the configure script can't determine your type of computer, give it
the name as an argument, for instance ``./configure sun4''.  You can
use the script ``config.sub'' to test whether a name is recognized; if
it is, config.sub translates it to a triplet specifying CPU, vendor,
and OS.)

If you have more than one compiler on your system, it is often best to
explicitly set CC in the environment before running configure, and to
also set CC when running make.  For example (assuming sh/bash/ksh):

	CC=gcc ./configure
	make

A similar example using csh:

	setenv CC gcc
	./configure
	make

Much of the code and documentation enclosed is copyright by
the Free Software Foundation, Inc.  See the file COPYING or
COPYING.LIB in the various directories, for a description of the
GNU General Public License terms under which you can copy the files.

REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info
on where and how to report problems.