1 files changed, 159 insertions, 0 deletions
diff --git a/gdbserver/linux-bfin-low.cc b/gdbserver/linux-bfin-low.cc
new file mode 100644
index 0000000..5bfc886
--- /dev/null
+++ b/gdbserver/linux-bfin-low.cc
@@ -0,0 +1,159 @@
+/* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
+
+   Copyright (C) 2005-2020 Free Software Foundation, Inc.
+
+   Contributed by Analog Devices, 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 <asm/ptrace.h>
+
+/* Defined in auto-generated file reg-bfin.c.  */
+void init_registers_bfin (void);
+extern const struct target_desc *tdesc_bfin;
+
+static int bfin_regmap[] =
+{
+  PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
+  PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
+  PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
+  PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
+  PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
+  PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
+  -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
+  -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
+  PT_PC,
+};
+
+#define bfin_num_regs ARRAY_SIZE (bfin_regmap)
+
+static int
+bfin_cannot_store_register (int regno)
+{
+  return (regno >= bfin_num_regs);
+}
+
+static int
+bfin_cannot_fetch_register (int regno)
+{
+  return (regno >= bfin_num_regs);
+}
+
+#define bfin_breakpoint_len 2
+static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
+
+/* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
+
+static const gdb_byte *
+bfin_sw_breakpoint_from_kind (int kind, int *size)
+{
+  *size = bfin_breakpoint_len;
+  return bfin_breakpoint;
+}
+
+static int
+bfin_breakpoint_at (CORE_ADDR where)
+{
+  unsigned char insn[bfin_breakpoint_len];
+
+  read_inferior_memory(where, insn, bfin_breakpoint_len);
+  if (insn[0] == bfin_breakpoint[0]
+      && insn[1] == bfin_breakpoint[1])
+    return 1;
+
+  /* If necessary, recognize more trap instructions here.  GDB only uses the
+     one.  */
+  return 0;
+}
+
+static void
+bfin_arch_setup (void)
+{
+  current_process ()->tdesc = tdesc_bfin;
+}
+
+/* Support for hardware single step.  */
+
+static int
+bfin_supports_hardware_single_step (void)
+{
+  return 1;
+}
+
+static struct usrregs_info bfin_usrregs_info =
+  {
+    bfin_num_regs,
+    bfin_regmap,
+  };
+
+static struct regs_info regs_info =
+  {
+    NULL, /* regset_bitmap */
+    &bfin_usrregs_info,
+  };
+
+static const struct regs_info *
+bfin_regs_info (void)
+{
+  return &regs_info;
+}
+
+struct linux_target_ops the_low_target = {
+  bfin_arch_setup,
+  bfin_regs_info,
+  bfin_cannot_fetch_register,
+  bfin_cannot_store_register,
+  NULL, /* fetch_register */
+  linux_get_pc_32bit,
+  linux_set_pc_32bit,
+  NULL, /* breakpoint_kind_from_pc */
+  bfin_sw_breakpoint_from_kind,
+  NULL, /* get_next_pcs */
+  2,
+  bfin_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 */
+  bfin_supports_hardware_single_step,
+};
+
+
+void
+initialize_low_arch (void)
+{
+  init_registers_bfin ();
+}