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   const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;
  35
  36 protected:
  37
  38   void low_arch_setup () override;
  39
  40   bool low_cannot_fetch_register (int regno) override;
  41
  42   bool low_cannot_store_register (int regno) override;
  43
  44   bool low_supports_breakpoints () override;
  45
  46   CORE_ADDR low_get_pc (regcache *regcache) override;
  47
  48   void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
  49 };
  50
  51 /* The singleton target ops object.  */
  52
  53 static m32r_target the_m32r_target;
  54
  55 bool
  56 m32r_target::low_supports_breakpoints ()
  57 {
  58   return true;
  59 }
  60
  61 CORE_ADDR
  62 m32r_target::low_get_pc (regcache *regcache)
  63 {
  64   return linux_get_pc_32bit (regcache);
  65 }
  66
  67 void
  68 m32r_target::low_set_pc (regcache *regcache, CORE_ADDR pc)
  69 {
  70   linux_set_pc_32bit (regcache, pc);
  71 }
  72
  73 /* Defined in auto-generated file reg-m32r.c.  */
  74 void init_registers_m32r (void);
  75 extern const struct target_desc *tdesc_m32r;
  76
  77 #define m32r_num_regs 25
  78
  79 static int m32r_regmap[] = {
  80 #ifdef PT_R0
  81   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  82   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  83   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  84 #else
  85   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  86   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  87   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  88 #endif
  89 };
  90
  91 bool
  92 m32r_target::low_cannot_store_register (int regno)
  93 {
  94   return (regno >= m32r_num_regs);
  95 }
  96
  97 bool
  98 m32r_target::low_cannot_fetch_register (int regno)
  99 {
 100   return (regno >= m32r_num_regs);
 101 }
 102
 103 static const unsigned short m32r_breakpoint = 0x10f1;
 104 #define m32r_breakpoint_len 2
 105
 106 /* Implementation of target ops method "sw_breakpoint_from_kind".  */
 107
 108 const gdb_byte *
 109 m32r_target::sw_breakpoint_from_kind (int kind, int *size)
 110 {
 111   *size = m32r_breakpoint_len;
 112   return (const gdb_byte *) &m32r_breakpoint;
 113 }
 114
 115 static int
 116 m32r_breakpoint_at (CORE_ADDR where)
 117 {
 118   unsigned short insn;
 119
 120   the_target->read_memory (where, (unsigned char *) &insn,
 121                            m32r_breakpoint_len);
 122   if (insn == m32r_breakpoint)
 123     return 1;
 124
 125   /* If necessary, recognize more trap instructions here.  GDB only uses the
 126      one.  */
 127   return 0;
 128 }
 129
 130 void
 131 m32r_target::low_arch_setup ()
 132 {
 133   current_process ()->tdesc = tdesc_m32r;
 134 }
 135
 136 /* Support for hardware single step.  */
 137
 138 static int
 139 m32r_supports_hardware_single_step (void)
 140 {
 141   return 1;
 142 }
 143
 144 static struct usrregs_info m32r_usrregs_info =
 145   {
 146     m32r_num_regs,
 147     m32r_regmap,
 148   };
 149
 150 static struct regs_info myregs_info =
 151   {
 152     NULL, /* regset_bitmap */
 153     &m32r_usrregs_info,
 154   };
 155
 156 const regs_info *
 157 m32r_target::get_regs_info ()
 158 {
 159   return &myregs_info;
 160 }
 161
 162 struct linux_target_ops the_low_target = {
 163   m32r_breakpoint_at,
 164   NULL, /* supports_z_point_type */
 165   NULL, /* insert_point */
 166   NULL, /* remove_point */
 167   NULL, /* stopped_by_watchpoint */
 168   NULL, /* stopped_data_address */
 169   NULL, /* collect_ptrace_register */
 170   NULL, /* supply_ptrace_register */
 171   NULL, /* siginfo_fixup */
 172   NULL, /* new_process */
 173   NULL, /* delete_process */
 174   NULL, /* new_thread */
 175   NULL, /* delete_thread */
 176   NULL, /* new_fork */
 177   NULL, /* prepare_to_resume */
 178   NULL, /* process_qsupported */
 179   NULL, /* supports_tracepoints */
 180   NULL, /* get_thread_area */
 181   NULL, /* install_fast_tracepoint_jump_pad */
 182   NULL, /* emit_ops */
 183   NULL, /* get_min_fast_tracepoint_insn_len */
 184   NULL, /* supports_range_stepping */
 185   m32r_supports_hardware_single_step,
 186 };
 187
 188 /* The linux target ops object.  */
 189
 190 linux_process_target *the_linux_target = &the_m32r_target;
 191
 192 void
 193 initialize_low_arch (void)
 194 {
 195   init_registers_m32r ();
 196 }