gdbserver/linux-m32r-low.cc

   1 /* GNU/Linux/m32r specific low level interface, for the remote server for GDB.
   2    Copyright (C) 2005-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "server.h"
  20 #include "linux-low.h"
  21
  22 #ifdef HAVE_SYS_REG_H
  23 #include <sys/reg.h>
  24 #endif
  25
  26 /* Linux target op definitions for the m32r architecture.  */
  27
  28 class m32r_target : public linux_process_target
  29 {
  30 public:
  31
  32   const regs_info *get_regs_info () override;
  33
  34 protected:
  35
  36   void low_arch_setup () override;
  37
  38   bool low_cannot_fetch_register (int regno) override;
  39
  40   bool low_cannot_store_register (int regno) override;
  41
  42   bool low_supports_breakpoints () override;
  43
  44   CORE_ADDR low_get_pc (regcache *regcache) override;
  45
  46   void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
  47 };
  48
  49 /* The singleton target ops object.  */
  50
  51 static m32r_target the_m32r_target;
  52
  53 bool
  54 m32r_target::low_supports_breakpoints ()
  55 {
  56   return true;
  57 }
  58
  59 CORE_ADDR
  60 m32r_target::low_get_pc (regcache *regcache)
  61 {
  62   return linux_get_pc_32bit (regcache);
  63 }
  64
  65 void
  66 m32r_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
  67 {
  68   linux_set_pc_32bit (regcache, pc);
  69 }
  70
  71 /* Defined in auto-generated file reg-m32r.c.  */
  72 void init_registers_m32r (void);
  73 extern const struct target_desc *tdesc_m32r;
  74
  75 #define m32r_num_regs 25
  76
  77 static int m32r_regmap[] = {
  78 #ifdef PT_R0
  79   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  80   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  81   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  82 #else
  83   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  84   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  85   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  86 #endif
  87 };
  88
  89 bool
  90 m32r_target::low_cannot_store_register (int regno)
  91 {
  92   return (regno >= m32r_num_regs);
  93 }
  94
  95 bool
  96 m32r_target::low_cannot_fetch_register (int regno)
  97 {
  98   return (regno >= m32r_num_regs);
  99 }
 100
 101 static const unsigned short m32r_breakpoint = 0x10f1;
 102 #define m32r_breakpoint_len 2
 103
 104 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
 105
 106 static const gdb_byte *
 107 m32r_sw_breakpoint_from_kind (int kind, int *size)
 108 {
 109   *size = m32r_breakpoint_len;
 110   return (const gdb_byte *) &m32r_breakpoint;
 111 }
 112
 113 static int
 114 m32r_breakpoint_at (CORE_ADDR where)
 115 {
 116   unsigned short insn;
 117
 118   the_target->read_memory (where, (unsigned char *) &insn,
 119                            m32r_breakpoint_len);
 120   if (insn == m32r_breakpoint)
 121     return 1;
 122
 123   /* If necessary, recognize more trap instructions here.  GDB only uses the
 124      one.  */
 125   return 0;
 126 }
 127
 128 void
 129 m32r_target::low_arch_setup ()
 130 {
 131   current_process ()->tdesc = tdesc_m32r;
 132 }
 133
 134 /* Support for hardware single step.  */
 135
 136 static int
 137 m32r_supports_hardware_single_step (void)
 138 {
 139   return 1;
 140 }
 141
 142 static struct usrregs_info m32r_usrregs_info =
 143   {
 144     m32r_num_regs,
 145     m32r_regmap,
 146   };
 147
 148 static struct regs_info myregs_info =
 149   {
 150     NULL, /* regset_bitmap */
 151     &m32r_usrregs_info,
 152   };
 153
 154 const regs_info *
 155 m32r_target::get_regs_info ()
 156 {
 157   return &myregs_info;
 158 }
 159
 160 struct linux_target_ops the_low_target = {
 161   m32r_sw_breakpoint_from_kind,
 162   NULL,
 163   0,
 164   m32r_breakpoint_at,
 165   NULL, /* supports_z_point_type */
 166   NULL, /* insert_point */
 167   NULL, /* remove_point */
 168   NULL, /* stopped_by_watchpoint */
 169   NULL, /* stopped_data_address */
 170   NULL, /* collect_ptrace_register */
 171   NULL, /* supply_ptrace_register */
 172   NULL, /* siginfo_fixup */
 173   NULL, /* new_process */
 174   NULL, /* delete_process */
 175   NULL, /* new_thread */
 176   NULL, /* delete_thread */
 177   NULL, /* new_fork */
 178   NULL, /* prepare_to_resume */
 179   NULL, /* process_qsupported */
 180   NULL, /* supports_tracepoints */
 181   NULL, /* get_thread_area */
 182   NULL, /* install_fast_tracepoint_jump_pad */
 183   NULL, /* emit_ops */
 184   NULL, /* get_min_fast_tracepoint_insn_len */
 185   NULL, /* supports_range_stepping */
 186   m32r_supports_hardware_single_step,
 187 };
 188
 189 /* The linux target ops object.  */
 190
 191 linux_process_target *the_linux_target = &the_m32r_target;
 192
 193 void
 194 initialize_low_arch (void)
 195 {
 196   init_registers_m32r ();
 197 }