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Pierre Langlois 7dfa3edc03 [AArch64] Teach prologue unwinder to terminate gracefully
Without debugging information, we have the following issue when
examining a trace buffer:

~~~
...
(gdb) trace f
Tracepoint 3 at 0x7fb7fc28c0
(gdb) tstart
(gdb) continue
...
(gdb) tstop
(gdb) tfind start
Register 31 is not available.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Found trace frame 0, tracepoint 3
#-1 0x0000007fb7fc28c0 in f () ...
^^^
~~~

The reason for this is that the target's stack pointer is unavailable
when examining the trace buffer.  What we are seeing is due to the
'tfind' command creating a sentinel frame and unwinding it.  If an
exception is thrown, we are left with the sentinel frame being displayed
at level #-1.  The exception is thrown when the prologue unwinder tries
to read the stack pointer to construct an ID for the frame.

This patch fixes this by making the prologue unwinder catch
NOT_AVAILABLE_ERROR exceptions when either registers or memory is
unreadable and report back to the frame core code with
UNWIND_UNAVAILABLE.

gdb/ChangeLog:

	* aarch64-tdep.c (aarch64_prologue_cache) <available_p>: New
	field.
	(aarch64_make_prologue_cache_1): New function, factored out from
	aarch64_make_prologue_cache.  Do not allocate cache.  Set
	available_p.
	(aarch64_make_prologue_cache): Reimplement wrapping
	aarch64_make_prologue_cache_1, and swallowing
	NOT_AVAILABLE_ERROR.
	(aarch64_prologue_frame_unwind_stop_reason): New function.
	Return UNWIND_UNAVAILABLE if available_p is not set.
	(aarch64_prologue_unwind): Install it.
	(aarch64_prologue_this_id): Move prev_pc and prev_sp limit
	checks into aarch64_prologue_frame_unwind_stop_reason.  Call
	frame_id_build_unavailable_stack if available_p is not set.
2015-07-09 16:35:11 +01:00
bfd 2015-07-09 Catherine Moore <clm@codesourcery.com> 2015-07-09 08:07:47 -07:00
binutils 2015-07-09 Catherine Moore <clm@codesourcery.com> 2015-07-09 08:26:10 -07:00
config Sync dfp.m4 with gcc 2015-06-30 10:20:19 -07:00
cpu or1k: add missing l.msync, l.psync and l.psync instructions. 2014-07-20 20:26:09 +03:00
elfcpp Add chdr_size, Chdr, Chdr_write and Chdr_data 2015-04-08 10:29:40 -07:00
etc PR external/{16327,16328}: Remove etc/configure.texi and etc/standards.texi. 2014-06-27 11:33:25 +02:00
gas 2015-07-09 Catherine Moore <clm@codesourcery.com> 2015-07-09 08:26:10 -07:00
gdb [AArch64] Teach prologue unwinder to terminate gracefully 2015-07-09 16:35:11 +01:00
gold Make gold aarch64 accept long form of mapping symbols. 2015-07-07 16:40:13 -07:00
gprof Updated translations for various binutils components. 2015-04-29 16:26:14 +01:00
include 2015-07-09 Catherine Moore <clm@codesourcery.com> 2015-07-09 08:26:10 -07:00
intl
ld 2015-07-09 Catherine Moore <clm@codesourcery.com> 2015-07-09 08:26:10 -07:00
libdecnumber Sync libdecnumber with gcc 2015-06-30 10:22:36 -07:00
libiberty Sync libiberty from GCC, replaying updates to configure scripts 2015-06-24 21:43:02 +02:00
opcodes Remove ppc860, ppc750cl, ppc7450 insns from common ppc. 2015-07-03 10:57:14 +09:30
readline Fix executable indicator in file name completion on Windows. 2014-12-30 21:14:25 +02:00
sim Fix snafu with latest addition to the ARM sim. 2015-07-02 16:19:09 +01:00
texinfo
zlib Add missing ChangeLog entry 2015-03-31 13:15:01 -07:00
.cvsignore
.gitattributes Add a .gitattributes file for use with git-merge-changelog 2014-07-25 18:07:23 -04:00
.gitignore Sync the root .gitignore file with GCC's. 2013-01-11 15:17:35 +00:00
ChangeLog Sync toplevel configure with gcc 2015-06-30 10:15:57 -07:00
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
config-ml.in Sync config-ml.in with GCC trunk 2015-03-17 05:15:34 -07:00
config.guess Update config.guess and config.sub to the latest upstream version 2015-03-30 16:28:14 -04:00
config.rpath
config.sub Update config.guess and config.sub to the latest upstream version 2015-03-30 16:28:14 -04:00
configure Sync toplevel configure with gcc 2015-06-30 10:15:57 -07:00
configure.ac Sync toplevel configure with gcc 2015-06-30 10:15:57 -07:00
COPYING
COPYING.LIB
COPYING.LIBGLOSS 2013-01-07 Jeff Johnston <jjohnstn@redhat.com> 2013-01-07 21:39:26 +00:00
COPYING.NEWLIB 2013-10-01 Jeff Johnston <jjohnstn@redhat.com> 2013-10-01 18:14:04 +00:00
COPYING3
COPYING3.LIB
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 Update libtool.m4 from GCC trunk 2014-11-24 09:14:09 -08:00
ltgcc.m4
ltmain.sh PR target/59788 2014-02-06 11:01:57 +01:00
ltoptions.m4
ltsugar.m4
ltversion.m4
lt~obsolete.m4
MAINTAINERS Update description of ownership of files in include/ 2014-11-04 16:14:14 -08:00
Makefile.def Configure zlib with --enable-host-shared for shared bfd 2015-05-01 08:34:08 -07:00
Makefile.in Sync libiberty from GCC, replaying updates to configure scripts 2015-06-24 21:43:02 +02:00
Makefile.tpl Sync libiberty from GCC, replaying updates to configure scripts 2015-06-24 21:43:02 +02:00
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
README
README-maintainer-mode
setup.com
src-release.sh Adjust src-release.sh for sim using the gdb create-version.sh. 2015-04-15 04:08:51 +02:00
symlink-tree
ylwrap Update from upstream Automake 2014-11-16 13:43:48 +01:00

		   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.