gdbserver/linux-bfin-low.cc

   1 /* GNU/Linux/BFIN specific low level interface, for the remote server for GDB.
   2
   3    Copyright (C) 2005-2020 Free Software Foundation, Inc.
   4
   5    Contributed by Analog Devices, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "server.h"
  23 #include "linux-low.h"
  24 #include <asm/ptrace.h>
  25
  26 /* Linux target op definitions for the BFIN architecture.  */
  27
  28 class bfin_target : public linux_process_target
  29 {
  30 public:
  31
  32 };
  33
  34 /* The singleton target ops object.  */
  35
  36 static bfin_target the_bfin_target;
  37
  38 /* Defined in auto-generated file reg-bfin.c.  */
  39 void init_registers_bfin (void);
  40 extern const struct target_desc *tdesc_bfin;
  41
  42 static int bfin_regmap[] =
  43 {
  44   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  45   PT_P0, PT_P1, PT_P2, PT_P3, PT_P4, PT_P5, PT_USP, PT_FP,
  46   PT_I0, PT_I1, PT_I2, PT_I3, PT_M0, PT_M1, PT_M2, PT_M3,
  47   PT_B0, PT_B1, PT_B2, PT_B3, PT_L0, PT_L1, PT_L2, PT_L3,
  48   PT_A0X, PT_A0W, PT_A1X, PT_A1W, PT_ASTAT, PT_RETS,
  49   PT_LC0, PT_LT0, PT_LB0, PT_LC1, PT_LT1, PT_LB1,
  50   -1 /* PT_CYCLES */, -1 /* PT_CYCLES2 */,
  51   -1 /* PT_USP */, PT_SEQSTAT, PT_SYSCFG, PT_PC, PT_RETX, PT_RETN, PT_RETE,
  52   PT_PC,
  53 };
  54
  55 #define bfin_num_regs ARRAY_SIZE (bfin_regmap)
  56
  57 static int
  58 bfin_cannot_store_register (int regno)
  59 {
  60   return (regno >= bfin_num_regs);
  61 }
  62
  63 static int
  64 bfin_cannot_fetch_register (int regno)
  65 {
  66   return (regno >= bfin_num_regs);
  67 }
  68
  69 #define bfin_breakpoint_len 2
  70 static const gdb_byte bfin_breakpoint[bfin_breakpoint_len] = {0xa1, 0x00};
  71
  72 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  73
  74 static const gdb_byte *
  75 bfin_sw_breakpoint_from_kind (int kind, int *size)
  76 {
  77   *size = bfin_breakpoint_len;
  78   return bfin_breakpoint;
  79 }
  80
  81 static int
  82 bfin_breakpoint_at (CORE_ADDR where)
  83 {
  84   unsigned char insn[bfin_breakpoint_len];
  85
  86   read_inferior_memory(where, insn, bfin_breakpoint_len);
  87   if (insn[0] == bfin_breakpoint[0]
  88       && insn[1] == bfin_breakpoint[1])
  89     return 1;
  90
  91   /* If necessary, recognize more trap instructions here.  GDB only uses the
  92      one.  */
  93   return 0;
  94 }
  95
  96 static void
  97 bfin_arch_setup (void)
  98 {
  99   current_process ()->tdesc = tdesc_bfin;
 100 }
 101
 102 /* Support for hardware single step.  */
 103
 104 static int
 105 bfin_supports_hardware_single_step (void)
 106 {
 107   return 1;
 108 }
 109
 110 static struct usrregs_info bfin_usrregs_info =
 111   {
 112     bfin_num_regs,
 113     bfin_regmap,
 114   };
 115
 116 static struct regs_info regs_info =
 117   {
 118     NULL, /* regset_bitmap */
 119     &bfin_usrregs_info,
 120   };
 121
 122 static const struct regs_info *
 123 bfin_regs_info (void)
 124 {
 125   return &regs_info;
 126 }
 127
 128 struct linux_target_ops the_low_target = {
 129   bfin_arch_setup,
 130   bfin_regs_info,
 131   bfin_cannot_fetch_register,
 132   bfin_cannot_store_register,
 133   NULL, /* fetch_register */
 134   linux_get_pc_32bit,
 135   linux_set_pc_32bit,
 136   NULL, /* breakpoint_kind_from_pc */
 137   bfin_sw_breakpoint_from_kind,
 138   NULL, /* get_next_pcs */
 139   2,
 140   bfin_breakpoint_at,
 141   NULL, /* supports_z_point_type */
 142   NULL, /* insert_point */
 143   NULL, /* remove_point */
 144   NULL, /* stopped_by_watchpoint */
 145   NULL, /* stopped_data_address */
 146   NULL, /* collect_ptrace_register */
 147   NULL, /* supply_ptrace_register */
 148   NULL, /* siginfo_fixup */
 149   NULL, /* new_process */
 150   NULL, /* delete_process */
 151   NULL, /* new_thread */
 152   NULL, /* delete_thread */
 153   NULL, /* new_fork */
 154   NULL, /* prepare_to_resume */
 155   NULL, /* process_qsupported */
 156   NULL, /* supports_tracepoints */
 157   NULL, /* get_thread_area */
 158   NULL, /* install_fast_tracepoint_jump_pad */
 159   NULL, /* emit_ops */
 160   NULL, /* get_min_fast_tracepoint_insn_len */
 161   NULL, /* supports_range_stepping */
 162   NULL, /* breakpoint_kind_from_current_state */
 163   bfin_supports_hardware_single_step,
 164 };
 165
 166 /* The linux target ops object.  */
 167
 168 linux_process_target *the_linux_target = &the_bfin_target;
 169
 170 void
 171 initialize_low_arch (void)
 172 {
 173   init_registers_bfin ();
 174 }