[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.
	* gdb.cp/namespace.exp: Add breakpoint tests for functions
	starting with the global namespace.
2012-03-28  Pedro Alves  <palves@redhat.com>

	* ia64-linux-nat.c (u_offsets): Map IA64_EC_REGNUM to PT_AR_EC.
	* gdb.linespec/ls-dollar.cc: New file.
	* gdb.linespec/ls-dollar.exp: New test.
	* .dir-locals.el: New file.
	* python/py-inferior.c (infpy_read_memory): Remove cleanups and
	explicitly free 'buffer' on exit paths.  Decref 'membuf_object'
	before returning.
2012-03-28  Pedro Alves  <palves@redhat.com>

	* ia64-linux-nat.c (supply_fpregset, ia64_linux_fetch_register):
	Always supply $fr0 as 0.0 and $fr1 as 1.0.
Merge remote-tracking branch 'upstream/master'
2012-03-28  Pedro Alves  <palves@redhat.com>

	* linux-ia64-low.c (ia64_regmap): Map IA64_EC_REGNUM to PT_AR_EC.
	(IA64_GR0_REGNUM, IA64_FR0_REGNUM)
	(IA64_FR1_REGNUM): New defines.
	(ia64_fetch_register): New.
	(the_low_target): Install it.
	* linux-low.h (struct linux_target_ops) <fetch_register>: New
	field.
	* linux-low.c (linux_fetch_registers): Try the
	the_low_target.fetch_register hook first.

	* linux-arm-low.c (the_low_target): Adjust.
	* linux-bfin-low.c (the_low_target): Adjust.
	* linux-cris-low.c (the_low_target): Adjust.
	* linux-crisv32-low.c (the_low_target): Adjust.
	* linux-m32r-low.c (the_low_target): Adjust.
	* linux-m68k-low.c (the_low_target): Adjust.
	* linux-mips-low.c (the_low_target): Adjust.
	* linux-ppc-low.c (the_low_target): Adjust.
	* linux-s390-low.c (the_low_target): Adjust.
	* linux-sh-low.c (the_low_target): Adjust.
	* linux-sparc-low.c (the_low_target): Adjust.
	* linux-tic6x-low.c (the_low_target): Adjust.
	* linux-x86-low.c (the_low_target): Adjust.
	* linux-xtensa-low.c (the_low_target): Adjust.
Merge remote-tracking branch 'upstream/master'
framework for varobj type mutation

This patch introduces the framework necessary to support type mutations.
The only language that currently provides a language-specific hook for
that feature is Ada, but the hook remain unimplemented for now. The
actual implementation is tied to the rest of the varobj code for Ada,
and thus will be provided then.

gdb/ChangeLog:

        * varobj.c (ada_value_has_mutated): Add declaration.  New function.
        (struct language_specific): New field "value_has_mutated".
        (languages): Set field "value_has_mutated" in each entry of array.
        (varobj_value_has_mutated): New function.
        (varobj_udpdate): Add handling of type mutation.
        (value_of_root): Add handling of type mutation.
        (ada_value_has_mutated): New function.
Varobj support for Ada.

This patch adds varobj support for Ada variables.  Most of the code
is implemented in a separate Ada-specific file called ada-varobj.c.
The only bits in varobj.c are the functions used as the hooks in
the language-specific varobj's vector.

gdb/ChangeLog:

        * ada-varobj.h, ada-varobj.c: New files.
        * Makefile.in (SFILES): Add ada-varobj.c.
        (HFILES_NO_SRCDIR): Add ada-varobj.h.
        (COMMON_OBS): Add ada-varobj.o.
New varobj language callback: value_is_changeable_p.

This patch introduces a new language-specific callback for varobj
objects, allowing us to move the language-specific bits of the
varobj_value_is_changeable_p routine to language-specific functions.
This is more elegant than testing for the varobj's language...

gdb/ChangeLog:

        * varobj.c (default_value_is_changeable_p): New function,
        extracted from varobj_value_is_changeable_p.  Add declaration.
        (ada_value_is_changeable_p): New function, extracted from
        varobj_value_is_changeable_p.  Add declaration.
        (struct language_specific): New field "value_is_changeable_p".
        (languages): Add entries for new field.
        (varobj_create): Set language before calling install_new_value.
        (varobj_value_is_changeable_p): Reimplement to call the varobj's
        "value_is_changeable_p" language callback.
[doco] document the "type_changed" flag further.

gdb/doc/ChangeLog:

        * gdb.texinfo (GDB/MI Variable Objects): Document what happens
        to the children of a varobj and its update range when -var-update
        returns that the varobj's type changed.
[NEWS] Announce support for Ada varobj support.

gdb/ChangeLog:

        * NEWS: Add entry for Ada varobj support.
daily update
*** empty log message ***
Commit gdb and sim support for v850e2 and v850e2v3 on behalf of
Rathish C <Rathish.C@kpitcummins.com>.
	* bfd-in.h (bfd_get_arch_size, bfd_get_sign_extend_vma): Delete.
	* bfd-in2.h: Regenerate.
Merge remote-tracking branch 'upstream/master'