[binutils-gdb] Use gdbarch_long_bit to determine layout of FreeBSD siginfo_t.

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT a181c0bf7461c28cdb72a4074c6d7608119fb575 ***

Author: John Baldwin <jhb@FreeBSD.org>
Branch: master
Commit: a181c0bf7461c28cdb72a4074c6d7608119fb575

Use gdbarch_long_bit to determine layout of FreeBSD siginfo_t.

FreeBSD architectures are either ILP32 or LP64 resulting in two
different layouts for siginfo_t.  Previously, the 'bits_per_word'
member of bfd_arch_info was used to determine the layout to use for a
given FreeBSD architecture.  However, mipsn32 architectures inherit
from a 64-bit mips architecture where bits_per_word is 64.  As a
result, $_siginfo was not properly extracted from FreeBSD/mipsn32 core
dumps.  Fix this by using gdbarch_long_bit instead of 'bits_per_word'
to determine if a FreeBSD architecture is ILP32 or LP64.

gdb/ChangeLog:

	* fbsd-nat.c (fbsd_siginfo_size): Use gdbarch_long_bit.
	(fbsd_convert_siginfo): Likewise.
	* fbsd-tdep.c (fbsd_core_xfer_siginfo): Likewise.