1 files changed, 132 insertions, 0 deletions
diff --git a/gdbserver/linux-cris-low.cc b/gdbserver/linux-cris-low.cc
new file mode 100644
index 0000000..8ea5af9
--- /dev/null
+++ b/gdbserver/linux-cris-low.cc
@@ -0,0 +1,132 @@
+/* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
+   Copyright (C) 1995-2020 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 "server.h"
+#include "linux-low.h"
+#include "nat/gdb_ptrace.h"
+
+/* Defined in auto-generated file reg-cris.c.  */
+void init_registers_cris (void);
+extern const struct target_desc *tdesc_cris;
+
+/* CRISv10 */
+#define cris_num_regs 32
+
+/* Locations need to match <include/asm/arch/ptrace.h>.  */
+static int cris_regmap[] = {
+  15*4, 14*4, 13*4, 12*4,
+  11*4, 10*4, 9*4, 8*4,
+  7*4, 6*4, 5*4, 4*4,
+  3*4, 2*4, 23*4, 19*4,
+
+  -1, -1, -1, -1,
+  -1, 17*4, -1, 16*4,
+  -1, -1, -1, 18*4,
+  -1, 17*4, -1, -1
+
+};
+
+static int
+cris_cannot_store_register (int regno)
+{
+  if (cris_regmap[regno] == -1)
+    return 1;
+
+  return (regno >= cris_num_regs);
+}
+
+static int
+cris_cannot_fetch_register (int regno)
+{
+  if (cris_regmap[regno] == -1)
+    return 1;
+
+  return (regno >= cris_num_regs);
+}
+
+static const unsigned short cris_breakpoint = 0xe938;
+#define cris_breakpoint_len 2
+
+/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
+
+static const gdb_byte *
+cris_sw_breakpoint_from_kind (int kind, int *size)
+{
+  *size = cris_breakpoint_len;
+  return (const gdb_byte *) &cris_breakpoint;
+}
+
+static int
+cris_breakpoint_at (CORE_ADDR where)
+{
+  unsigned short insn;
+
+  (*the_target->read_memory) (where, (unsigned char *) &insn,
+			      cris_breakpoint_len);
+  if (insn == cris_breakpoint)
+    return 1;
+
+  /* If necessary, recognize more trap instructions here.  GDB only uses the
+     one.  */
+  return 0;
+}
+
+static void
+cris_arch_setup (void)
+{
+  current_process ()->tdesc = tdesc_cris;
+}
+
+static struct usrregs_info cris_usrregs_info =
+  {
+    cris_num_regs,
+    cris_regmap,
+  };
+
+static struct regs_info regs_info =
+  {
+    NULL, /* regset_bitmap */
+    &cris_usrregs_info,
+  };
+
+static const struct regs_info *
+cris_regs_info (void)
+{
+  return &regs_info;
+}
+
+struct linux_target_ops the_low_target = {
+  cris_arch_setup,
+  cris_regs_info,
+  cris_cannot_fetch_register,
+  cris_cannot_store_register,
+  NULL, /* fetch_register */
+  linux_get_pc_32bit,
+  linux_set_pc_32bit,
+  NULL, /* breakpoint_kind_from_pc */
+  cris_sw_breakpoint_from_kind,
+  NULL, /* get_next_pcs */
+  0,
+  cris_breakpoint_at,
+};
+
+void
+initialize_low_arch (void)
+{
+  init_registers_cris ();
+}