Add FreeBSD/arm architecture.

Support for collecting and supplying general purpose and floating
point registers is provided along with signal frame unwinding.  While
FreeBSD/arm kernels do populate NT_FPREGSET notes, they are always
zero-filled, so this implementation ignores them.  Recent FreeBSD/arm
kernels generate NT_ARM_VFP notes which are used to supply
floating-point registers.  As with Linux, the AT_HWCAP feature flags
are used to determine the correct target description.

gdb/ChangeLog:

	* Makefile.in (ALL_TARGET_OBS): Add arm-fbsd-tdep.o.
	(ALLDEPFILES): Add arm-fbsd-tdep.c.
	* NEWS: Mention new FreeBSD/arm target.
	* configure.tgt: Add arm*-*-freebsd*.
	* arm-fbsd-tdep.c: New file.
	* arm-fbsd-tdep.h: New file.

1 files changed, 40 insertions, 0 deletions

diff --git a/gdb/arm-fbsd-tdep.h b/gdb/arm-fbsd-tdep.h
new file mode 100644
index 0000000000..8717b804af
--- /dev/null
+++ b/gdb/arm-fbsd-tdep.h
@@ -0,0 +1,40 @@
+/* FreeBSD/arm target support, prototypes.
+
+   Copyright (C) 2017 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#include "regset.h"
+
+/* The general-purpose regset consists of 13 R registers, plus SP, LR,
+   PC, and CPSR registers.  */
+#define ARM_FBSD_SIZEOF_GREGSET  (17 * 4)
+
+/* The VFP regset consists of 32 D registers plus FPSCR, and the whole
+   structure is padded to 64-bit alignment.  */
+#define	ARM_FBSD_SIZEOF_VFPREGSET	(33 * 8)
+
+extern const struct regset arm_fbsd_gregset;
+extern const struct regset arm_fbsd_vfpregset;
+
+/* Flags passed in AT_HWCAP. */
+#define	HWCAP_VFP		0x00000040
+#define	HWCAP_NEON		0x00001000
+#define	HWCAP_VFPv3		0x00002000
+#define	HWCAP_VFPD32		0x00080000
+
+extern const struct target_desc *
+arm_fbsd_read_description_auxv (struct target_ops *target);