aarch64: introduce build support for aarch64_be target

Introduce support for aarch64_be, aarch64 big endian, target.
We would like to reuse all code that was done for aarch64
(little endian) target. So we do similar thing that is done
for ARM v7 (arm) target for any aarch64* arch we set it
just to aarch64.

Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
aarch64: fix wrong big_endian flag in aarch64_be case

Set local_addr_space.big_endian flag according to current target
endianness. Before it was set by memset to 0, which corresponds
to little endian and it worked perfectly fine for aarch64.
But it breaks aarch64_be because dwarf_readu16, dwarf_readu32,
etc functions do not read values correctly since they operate
with wrong idea about current target endianness.

Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
[PATCH] Fix build from scratch

- Add autogen.sh to bootstrap autotools generation
- Make generation of man pages optional, and check for
  availibity of latex2man if documentation is requested.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Signed-off-by: Arun Sharma <asharma@fb.com>
Check that the CIE is within the segment

Due to a bug in the gold linker[1], the .eh_frame and .eh_frame_hdr
sections contains garbage. When dwarf_extract_proc_info_from_fde tried
to look up the begin of the CIE subsection, it would underflow the
.eh_frame segment, resulting in a crash[2].

This patch avoids that crash by checking whether the CIE pointer is
located after the begin of the .eh_frame section. The variable "base"
was misused in various places as a boolean (decode as .debug_frame or
decode as .eh_frame). These instances have been renamed to
is_debug_frame where applicable.

Tested on Linux x86_64.

 [1]: https://sourceware.org/bugzilla/show_bug.cgi?id=17639
 [2]: http://lists.nongnu.org/archive/html/libunwind-devel/2014-11/msg00009.html

Signed-off-by: Peter Wu <peter@lekensteyn.nl>