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Joel Brobecker 5a75128f93 [ia64-linux] Allow libunwind to fetch register 0
On ia64-linux, GDB sometimes prints the following error when trying
to switch to a different task:

    (gdb) task 3
    Register 0 is not available

This is a random failure that sometimes happens, sometimes does not.
The error comes from the fact that the libunwind library is requesting
the value of register 0 (zero): This eventually leads us to
ia64-linux-nat.c:ia64_linux_fetch_register.

This function relies on ia64_cannot_fetch_register to determine
whether or not we have access to the register's value.  The ptrace
interface does not provide the r0 value, and so we end up telling
the regcache that this register's value is not available.  And yet,
for r0, we do not need to ask ptrace for its value, since it is
always zero.

So, the fix was to add a special rule for supplying a nul value
when regnum == IA64_GR0_REGNUM.

gdb/ChangeLog:

        * ia64-linux-nat.c (ia64_linux_fetch_register): Add special
        handling for r0.
2012-03-28 17:08:48 +00:00
bfd daily update 2012-03-27 23:00:05 +00:00
binutils PR binutils/3807 2012-03-13 00:41:22 +00:00
config config/: 2011-12-20 17:01:30 +00:00
cpu cpu/ 2012-02-27 06:57:57 +00:00
elfcpp elfcpp/ 2012-03-13 00:13:08 +00:00
etc PR other/46202: implement install-strip. 2010-11-20 19:37:58 +00:00
gas gas/ 2012-03-24 01:09:28 +00:00
gdb [ia64-linux] Allow libunwind to fetch register 0 2012-03-28 17:08:48 +00:00
gold 2012-03-21 Cary Coutant <ccoutant@google.com> 2012-03-21 19:02:22 +00:00
gprof 2012-03-06 Tristan Gingold <gingold@adacore.com> 2012-03-06 13:54:59 +00:00
include include/ 2012-03-15 12:58:48 +00:00
intl merge from gcc 2010-09-27 21:01:18 +00:00
ld ld/ 2012-03-27 19:23:59 +00:00
libdecnumber config/: 2011-12-20 17:01:30 +00:00
libiberty merge from gcc 2012-03-08 00:01:31 +00:00
opcodes gas/ 2012-03-24 01:09:28 +00:00
readline * signals.c (_rl_block_sigwinch, _rl_release_sigwinch): Add 2012-02-24 17:14:43 +00:00
sim sim: add bugzilla marking 2012-03-27 04:18:05 +00:00
texinfo * texinfo/texinfo.tex: Update to version 2009-03-28.05. 2009-04-21 12:36:46 +00:00
.cvsignore
.gitignore start a gitignore 2010-11-17 19:34:59 +00:00
ChangeLog * configure.ac (enable_libgomp): Remove *-*-irix6*. 2012-03-15 14:13:32 +00:00
compile Update automake-provided files in the toplevel. 2009-08-22 11:48:33 +00:00
config-ml.in * config-ml.in: Don't handle arc-*-elf*. 2011-03-22 20:01:13 +00:00
config.guess Sync from upstream: 2011-06-06 10:36:06 +00:00
config.rpath Remove freebsd1 from libtool.m4 macros and config.rpath. 2011-02-13 21:00:14 +00:00
config.sub * config.sub: Update to version 2011-10-29 (added rl78) 2011-11-02 00:56:53 +00:00
configure * configure.ac (enable_libgomp): Remove *-*-irix6*. 2012-03-15 14:13:32 +00:00
configure.ac * configure.ac (enable_libgomp): Remove *-*-irix6*. 2012-03-15 14:13:32 +00:00
COPYING
COPYING3
COPYING3.LIB
COPYING.LIB
COPYING.LIBGLOSS 2012-03-09 Jeff Johnston <jjohnstn@redhat.com> 2012-03-09 20:31:34 +00:00
COPYING.NEWLIB 2012-03-09 Jeff Johnston <jjohnstn@redhat.com> 2012-03-09 20:31:34 +00:00
depcomp Update automake-provided files in the toplevel. 2009-08-22 11:48:33 +00:00
djunpack.bat
install-sh Update automake-provided files in the toplevel. 2009-08-22 11:48:33 +00:00
libtool.m4 Remove freebsd1 from libtool.m4 macros and config.rpath. 2011-02-13 21:00:14 +00:00
lt~obsolete.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
ltgcc.m4
ltmain.sh Backport from Libtool: Fix relink mode to use absolute path if hardcode_minus_L. 2011-01-13 18:52:53 +00:00
ltoptions.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
ltsugar.m4
ltversion.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
MAINTAINERS Import move-if-change script from gnulib. 2011-02-12 15:47:02 +00:00
Makefile.def 2011-11-09 Roland McGrath <mcgrathr@google.com> 2011-11-09 18:57:30 +00:00
Makefile.in 2011-11-09 Roland McGrath <mcgrathr@google.com> 2011-11-09 18:57:30 +00:00
Makefile.tpl 2011-11-09 Roland McGrath <mcgrathr@google.com> 2011-11-09 18:57:30 +00:00
makefile.vms
missing Update automake-provided files in the toplevel. 2009-08-22 11:48:33 +00:00
mkdep
mkinstalldirs Update automake-provided files in the toplevel. 2009-08-22 11:48:33 +00:00
move-if-change Import move-if-change script from gnulib. 2011-02-12 15:47:02 +00:00
README
README-maintainer-mode Cleanups after the update to Autoconf 2.64, Automake 1.11. 2009-08-22 17:08:11 +00:00
setup.com 2009-09-01 Tristan Gingold <gingold@adacore.com> 2009-09-01 13:38:26 +00:00
src-release Include the <root>/cpu/ dir in GDB releases 2011-08-19 15:48:36 +00:00
symlink-tree
ylwrap Update automake-provided files in the toplevel. 2009-08-22 11:48:33 +00:00

		   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.