Add native target for FreeBSD/riscv.

gdb/ChangeLog:

	* Makefile.in (ALLDEPFILES): Add riscv-fbsd-nat.c.
	* NEWS: Mention new FreeBSD/riscv native configuration.
	* configure.host: Add riscv*-*-freebsd*.
	* configure.nat: Likewise.
	* riscv-fbsd-nat.c: New file.

gdb/doc/ChangeLog:

	* gdb.texinfo (Contributors): Add SRI International and University
	of Cambridge for FreeBSD/riscv.

1 files changed, 135 insertions, 0 deletions

diff --git a/gdb/riscv-fbsd-nat.c b/gdb/riscv-fbsd-nat.c
new file mode 100644
index 00000000000..ad4ea1e0ad1
--- /dev/null
+++ b/gdb/riscv-fbsd-nat.c
@@ -0,0 +1,135 @@
+/* Native-dependent code for FreeBSD/riscv.
+
+   Copyright (C) 2018 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 "defs.h"
+#include "target.h"
+
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#include "fbsd-nat.h"
+#include "riscv-tdep.h"
+#include "riscv-fbsd-tdep.h"
+#include "inf-ptrace.h"
+
+struct riscv_fbsd_nat_target final : public fbsd_nat_target
+{
+  void fetch_registers (struct regcache *, int) override;
+  void store_registers (struct regcache *, int) override;
+};
+
+static riscv_fbsd_nat_target the_riscv_fbsd_nat_target;
+
+/* Determine if PT_GETREGS fetches REGNUM.  */
+
+static bool
+getregs_supplies (struct gdbarch *gdbarch, int regnum)
+{
+  return (regnum >= RISCV_RA_REGNUM && regnum <= RISCV_PC_REGNUM);
+}
+
+/* Determine if PT_GETFPREGS fetches REGNUM.  */
+
+static bool
+getfpregs_supplies (struct gdbarch *gdbarch, int regnum)
+{
+  return ((regnum >= RISCV_FIRST_FP_REGNUM && regnum <= RISCV_LAST_FP_REGNUM)
+	  || regnum == RISCV_CSR_FCSR_REGNUM);
+}
+
+/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
+   for all registers.  */
+
+void
+riscv_fbsd_nat_target::fetch_registers (struct regcache *regcache,
+					int regnum)
+{
+  pid_t pid = get_ptrace_pid (regcache->ptid ());
+
+  struct gdbarch *gdbarch = regcache->arch ();
+  if (regnum == -1 || regnum == RISCV_ZERO_REGNUM)
+    regcache->raw_supply_zeroed (RISCV_ZERO_REGNUM);
+  if (regnum == -1 || getregs_supplies (gdbarch, regnum))
+    {
+      struct reg regs;
+
+      if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+	perror_with_name (_("Couldn't get registers"));
+
+      regcache->supply_regset (&riscv_fbsd_gregset, regnum, &regs,
+			       sizeof (regs));
+    }
+
+  if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
+    {
+      struct fpreg fpregs;
+
+      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't get floating point status"));
+
+      regcache->supply_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
+			       sizeof (fpregs));
+    }
+}
+
+/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
+   this for all registers.  */
+
+void
+riscv_fbsd_nat_target::store_registers (struct regcache *regcache,
+					int regnum)
+{
+  pid_t pid = get_ptrace_pid (regcache->ptid ());
+
+  struct gdbarch *gdbarch = regcache->arch ();
+  if (regnum == -1 || getregs_supplies (gdbarch, regnum))
+    {
+      struct reg regs;
+
+      if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+	perror_with_name (_("Couldn't get registers"));
+
+      regcache->collect_regset (&riscv_fbsd_gregset, regnum, &regs,
+			       sizeof (regs));
+
+      if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) &regs, 0) == -1)
+	perror_with_name (_("Couldn't write registers"));
+    }
+
+  if (regnum == -1 || getfpregs_supplies (gdbarch, regnum))
+    {
+      struct fpreg fpregs;
+
+      if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't get floating point status"));
+
+      regcache->collect_regset (&riscv_fbsd_fpregset, regnum, &fpregs,
+				sizeof (fpregs));
+
+      if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+	perror_with_name (_("Couldn't write floating point status"));
+    }
+}
+
+void
+_initialize_riscv_fbsd_nat (void)
+{
+  add_inf_child_target (&the_riscv_fbsd_nat_target);
+}