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Yao Qi 5b061e9886 Deliver signal in hardware single step
GDBserver doesn't deliver signal when stepping over a breakpoint even
hardware single step is used.  When GDBserver started to step over
(thread creation) breakpoint for mutlit-threaded debugging in 2002 [1],
GDBserver behaves this way.

This behavior gets trouble on conditional breakpoints on branch to
self instruction like this,

   0x00000000004005b6 <+29>:	jmp    0x4005b6 <main+29>

and I set breakpoint

$(gdb) break branch-to-self.c:43 if counter > 3

and the variable counter will be set to 5 in SIGALRM signal handler.
Since GDBserver keeps stepping over breakpoint, the SIGALRM can never
be dequeued and delivered to the inferior, so the program can't stop.
The test can be found in gdb.base/branch-to-self.exp.

GDBserver didn't deliver signal when stepping over a breakpoint because
a tracepoint is collected twice if GDBserver does so in the following
scenario, which can be reproduced by gdb.trace/signal.exp.

 - program stops at tracepoint, and tracepoint is collected,
 - gdbserver starts a step-over,
 - a signal arrives, step-over is canceled, and signal should be passed,
 - gdbserver starts a new step-over again, pass the signal as well,
 - program stops at the entry of signal handler, step-over finished,
 - gdbserver proceeds,
 - program returns from the signal handler, again to the tracepoint,
   and thus is collected again.

The spurious collection isn't that harmful, IMO, so it should be OK
to let GDBserver deliver signal when stepping over a breakpoint.

gdb/gdbserver:

2016-04-22  Yao Qi  <yao.qi@linaro.org>

	* linux-low.c (lwp_signal_can_be_delivered): Don't deliver
	signal when stepping over breakpoint with software single
	step.

gdb/testsuite:

2016-04-22  Yao Qi  <yao.qi@linaro.org>

	* gdb.trace/signal.exp: Also pass if
	$tracepoint_hits($i) > $iterations.
2016-04-22 11:59:18 +01:00
bfd Exclude linker created file from dynobj 2016-04-21 21:45:57 -07:00
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gas MIPS/GAS: Fix an ISA override not lifting ABI restrictions 2016-04-22 01:22:29 +01:00
gdb Deliver signal in hardware single step 2016-04-22 11:59:18 +01:00
gold
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include Add support for non-ELF targets to check their relocs. 2016-04-21 15:43:00 +01:00
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ld Always run LTO tests on Linux with GCC 4.9 or newer 2016-04-21 09:09:13 -07:00
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		   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.