1 files changed, 222 insertions, 0 deletions
diff --git a/gdbserver/linux-tile-low.c b/gdbserver/linux-tile-low.c
new file mode 100644
index 00000000000..cd85e945a46
--- /dev/null
+++ b/gdbserver/linux-tile-low.c
@@ -0,0 +1,222 @@
+/* GNU/Linux/TILE-Gx specific low level interface, GDBserver.
+
+   Copyright (C) 2012-2020 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 <arch/abi.h>
+#include "nat/gdb_ptrace.h"
+
+/* Defined in auto-generated file reg-tilegx.c.  */
+void init_registers_tilegx (void);
+extern const struct target_desc *tdesc_tilegx;
+
+/* Defined in auto-generated file reg-tilegx32.c.  */
+void init_registers_tilegx32 (void);
+extern const struct target_desc *tdesc_tilegx32;
+
+#define tile_num_regs 65
+
+static int tile_regmap[] =
+{
+   0,  1,  2,  3,  4,  5,  6,  7,
+   8,  9, 10, 11, 12, 13, 14, 15,
+  16, 17, 18, 19, 20, 21, 22, 23,
+  24, 25, 26, 27, 28, 29, 30, 31,
+  32, 33, 34, 35, 36, 37, 38, 39,
+  40, 41, 42, 43, 44, 45, 46, 47,
+  48, 49, 50, 51, 52, 53, 54, 55,
+  -1, -1, -1, -1, -1, -1, -1, -1,
+  56
+};
+
+static int
+tile_cannot_fetch_register (int regno)
+{
+  if (regno >= 0 && regno < 56)
+    return 0;
+  else if (regno == 64)
+    return 0;
+  else
+    return 1;
+}
+
+static int
+tile_cannot_store_register (int regno)
+{
+  if (regno >= 0 && regno < 56)
+    return 0;
+  else if (regno == 64)
+    return 0;
+  else
+    return 1;
+}
+
+static uint64_t tile_breakpoint = 0x400b3cae70166000ULL;
+#define tile_breakpoint_len 8
+
+/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
+
+static const gdb_byte *
+tile_sw_breakpoint_from_kind (int kind, int *size)
+{
+  *size = tile_breakpoint_len;
+  return (const gdb_byte *) &tile_breakpoint;
+}
+
+static int
+tile_breakpoint_at (CORE_ADDR where)
+{
+  uint64_t insn;
+
+  (*the_target->read_memory) (where, (unsigned char *) &insn, 8);
+  if (insn == tile_breakpoint)
+    return 1;
+
+  /* If necessary, recognize more trap instructions here.  GDB only uses the
+     one.  */
+  return 0;
+}
+
+static void
+tile_fill_gregset (struct regcache *regcache, void *buf)
+{
+  int i;
+
+  for (i = 0; i < tile_num_regs; i++)
+    if (tile_regmap[i] != -1)
+      collect_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
+}
+
+static void
+tile_store_gregset (struct regcache *regcache, const void *buf)
+{
+  int i;
+
+  for (i = 0; i < tile_num_regs; i++)
+    if (tile_regmap[i] != -1)
+      supply_register (regcache, i, ((uint_reg_t *) buf) + tile_regmap[i]);
+}
+
+static struct regset_info tile_regsets[] =
+{
+  { PTRACE_GETREGS, PTRACE_SETREGS, 0, tile_num_regs * 8,
+    GENERAL_REGS, tile_fill_gregset, tile_store_gregset },
+  NULL_REGSET
+};
+
+static struct regsets_info tile_regsets_info =
+  {
+    tile_regsets, /* regsets */
+    0, /* num_regsets */
+    NULL, /* disabled_regsets */
+  };
+
+static struct usrregs_info tile_usrregs_info =
+  {
+    tile_num_regs,
+    tile_regmap,
+  };
+
+static struct regs_info regs_info =
+  {
+    NULL, /* regset_bitmap */
+    &tile_usrregs_info,
+    &tile_regsets_info,
+  };
+
+static const struct regs_info *
+tile_regs_info (void)
+{
+  return &regs_info;
+}
+
+static void
+tile_arch_setup (void)
+{
+  int pid = pid_of (current_thread);
+  unsigned int machine;
+  int is_elf64 = linux_pid_exe_is_elf_64_file (pid, &machine);
+
+  if (sizeof (void *) == 4)
+    if (is_elf64 > 0)
+      error (_("Can't debug 64-bit process with 32-bit GDBserver"));
+
+  if (!is_elf64)
+    current_process ()->tdesc = tdesc_tilegx32;
+  else
+    current_process ()->tdesc = tdesc_tilegx;
+}
+
+/* Support for hardware single step.  */
+
+static int
+tile_supports_hardware_single_step (void)
+{
+  return 1;
+}
+
+
+struct linux_target_ops the_low_target =
+{
+  tile_arch_setup,
+  tile_regs_info,
+  tile_cannot_fetch_register,
+  tile_cannot_store_register,
+  NULL,
+  linux_get_pc_64bit,
+  linux_set_pc_64bit,
+  NULL, /* breakpoint_kind_from_pc */
+  tile_sw_breakpoint_from_kind,
+  NULL,
+  0,
+  tile_breakpoint_at,
+  NULL, /* supports_z_point_type */
+  NULL, /* insert_point */
+  NULL, /* remove_point */
+  NULL, /* stopped_by_watchpoint */
+  NULL, /* stopped_data_address */
+  NULL, /* collect_ptrace_register */
+  NULL, /* supply_ptrace_register */
+  NULL, /* siginfo_fixup */
+  NULL, /* new_process */
+  NULL, /* delete_process */
+  NULL, /* new_thread */
+  NULL, /* delete_thread */
+  NULL, /* new_fork */
+  NULL, /* prepare_to_resume */
+  NULL, /* process_qsupported */
+  NULL, /* supports_tracepoints */
+  NULL, /* get_thread_area */
+  NULL, /* install_fast_tracepoint_jump_pad */
+  NULL, /* emit_ops */
+  NULL, /* get_min_fast_tracepoint_insn_len */
+  NULL, /* supports_range_stepping */
+  NULL, /* breakpoint_kind_from_current_state */
+  tile_supports_hardware_single_step,
+};
+
+void
+initialize_low_arch (void)
+{
+  init_registers_tilegx32();
+  init_registers_tilegx();
+
+  initialize_regsets_info (&tile_regsets_info);
+}