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Luis Machado 29090fb629 Make GDB wait for events after handling target File-I/O
_ftext () at arm-vector.S:25
25              ldr pc, [pc, #24] @ reset
(gdb) load
Loading section .text, size 0xc01c lma 0x0
Loading section .eh_frame, size 0x48 lma 0xc01c
Loading section .ARM.exidx, size 0x8 lma 0xc064
Loading section .rodata, size 0x398 lma 0xc070
Loading section .data, size 0x8e0 lma 0xc408
Start address 0x40, load size 52452
Transfer rate: 17074 KB/sec, 1748 bytes/write.
(gdb) c
Continuing.
infrun: clear_proceed_status_thread (Thread 1)
infrun: proceed (addr=0xffffffff, signal=GDB_SIGNAL_DEFAULT)
infrun: resume (step=0, signal=GDB_SIGNAL_0), trap_expected=0, current thread [Thread 1] at 0x40
Sending packet: $vCont?#49...Ack
Packet received:
Packet vCont (verbose-resume) is NOT supported
Sending packet: $Hc0#db...Ack
Packet received: OK
Sending packet: $c#63...Ack
infrun: infrun_async(1)
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [Thread 0],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
Packet received: Ffstat,00000001,07fffdb0
Sending packet: $M7fffdb0,40:000000000000000000002080000000010000c336000001180000000000000000000000000000000000000200000000000000000055dfb11b55dfb11b55dfb11b#5a...Ack
Packet received: OK
Sending packet: $F0#76...Ack
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [Thread 0],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [Thread 0],
infrun:   status->kind = no-resumed
infrun: TARGET_WAITKIND_NO_RESUMED
infrun: stop_waiting
infrun: clear_step_over_info
Sending packet: $qfThreadInfo#bb...Ack
Packet received: m1
Sending packet: $qsThreadInfo#c8...Ack
Packet received: l
No unwaited-for children left.
infrun: infrun_async(0)
(gdb) c
Continuing.
Cannot execute this command while the selected thread is running.
(gdb)
Continuing.
Cannot execute this command while the selected thread is running.

This behavior shows up whenever GDB is in all-stop mode and is handling
target-initiated File-I/O requests, in the middle of, say, a continue
request.

When GDB is done handling the File-I/O request, it doesn't set
rs->waiting_for_stop_reply back to 1, meaning GDB should wait for
further target events.

This seems to be a latent bug, because in the past this didn't really
cause any issues. But it seems to have been uncovered by commit
567420d108, which explicitly checks
for rs->waiting_for_stop_reply == 0, triggering the failures above.

The following patch fixes this by reorganizing the setting of
rs->waiting_for_stop_reply.

infrun: prepare_to_wait
Packet received: Ffstat,00000001,07fffdb0
Sending packet: $M7fffdb0,40:000000000000000000002080000000010000c336000001180000000000000000000000000000000000000200000000000000000055dfb19e55dfb19e55dfb19e#7b...Ack
Packet received: OK
Sending packet: $F0#76...Ack
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [Thread 0],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
Packet received: Fisatty,00000001
Sending packet: $F1#77...Ack
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [Thread 0],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
Packet received: Fwrite,00000001,0000d098,00000004
Sending packet: $md098,4#d2...Ack
Packet received: 3732300a
720
Sending packet: $F4#7a...Ack
infrun: target_wait (-1.0.0, status) =
infrun:   -1.0.0 [Thread 0],
infrun:   status->kind = ignore
infrun: TARGET_WAITKIND_IGNORE
infrun: prepare_to_wait
Packet received: Fwrite,00000001,07ffffac,00000011
Sending packet: $m7ffffac,11#8e...Ack
Packet received: 0a2a2a2a204558495420636f646520300a

*** EXIT code 0

Regression-tested on Ubuntu x86-64 and qemu-system-based debugging
for arm eabi.

gdb/ChangeLog:

2015-10-16  Luis Machado  <lgustavo@codesourcery.com>

	* remote.c (remote_wait_as): Set rs->waiting_for_stop_reply to 0
	when handling 'E', 'T', 'S', 'X' and 'W' packets.
	Do not set rs->waiting_for_stop_reply back to 1.
2015-10-19 11:36:01 -02:00
bfd Automatic date update in version.in 2015-10-19 00:00:08 +00:00
binutils Fix PR binutils/19147 -- off by one when printing NT_FILE note. 2015-10-18 09:39:25 -07:00
config
cpu
elfcpp
etc
gas Add a gas configure option to select the default behaviour for the generation of debug sections - compressed or uncompressed. 2015-10-19 11:45:54 +01:00
gdb Make GDB wait for events after handling target File-I/O 2015-10-19 11:36:01 -02:00
gold Don't ignore "-m emulation" command line option 2015-10-16 08:05:09 -07:00
gprof
include
intl
ld Add test to ensure that ternary linker script operators copy symbol flags. 2015-10-19 14:32:54 +01:00
libdecnumber
libiberty
opcodes
readline
sim
texinfo
zlib
.cvsignore
.gitattributes
.gitignore
ChangeLog
compile
config-ml.in
config.guess
config.rpath
config.sub
configure
configure.ac
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS
COPYING.NEWLIB
depcomp
djunpack.bat
install-sh
libtool.m4
lt~obsolete.m4
ltgcc.m4
ltmain.sh
ltoptions.m4
ltsugar.m4
ltversion.m4
MAINTAINERS
Makefile.def
Makefile.in
Makefile.tpl
makefile.vms
missing
mkdep
mkinstalldirs
move-if-change
README
README-maintainer-mode
setup.com
src-release.sh
symlink-tree
ylwrap

		   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.