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
  43 /* The singleton target ops object.  */
  44
  45 static m32r_target the_m32r_target;
  46
  47 /* Defined in auto-generated file reg-m32r.c.  */
  48 void init_registers_m32r (void);
  49 extern const struct target_desc *tdesc_m32r;
  50
  51 #define m32r_num_regs 25
  52
  53 static int m32r_regmap[] = {
  54 #ifdef PT_R0
  55   PT_R0, PT_R1, PT_R2, PT_R3, PT_R4, PT_R5, PT_R6, PT_R7,
  56   PT_R8, PT_R9, PT_R10, PT_R11, PT_R12, PT_FP, PT_LR, PT_SPU,
  57   PT_PSW, PT_CBR, PT_SPI, PT_SPU, PT_BPC, PT_PC, PT_ACCL, PT_ACCH, PT_EVB
  58 #else
  59   4 * 4, 4 * 5, 4 * 6, 4 * 7, 4 * 0, 4 * 1, 4 * 2, 4 * 8,
  60   4 * 9, 4 * 10, 4 * 11, 4 * 12, 4 * 13, 4 * 24, 4 * 25, 4 * 23,
  61   4 * 19, 4 * 31, 4 * 26, 4 * 23, 4 * 20, 4 * 30, 4 * 16, 4 * 15, 4 * 32
  62 #endif
  63 };
  64
  65 bool
  66 m32r_target::low_cannot_store_register (int regno)
  67 {
  68   return (regno >= m32r_num_regs);
  69 }
  70
  71 bool
  72 m32r_target::low_cannot_fetch_register (int regno)
  73 {
  74   return (regno >= m32r_num_regs);
  75 }
  76
  77 static const unsigned short m32r_breakpoint = 0x10f1;
  78 #define m32r_breakpoint_len 2
  79
  80 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind".  */
  81
  82 static const gdb_byte *
  83 m32r_sw_breakpoint_from_kind (int kind, int *size)
  84 {
  85   *size = m32r_breakpoint_len;
  86   return (const gdb_byte *) &m32r_breakpoint;
  87 }
  88
  89 static int
  90 m32r_breakpoint_at (CORE_ADDR where)
  91 {
  92   unsigned short insn;
  93
  94   the_target->read_memory (where, (unsigned char *) &insn,
  95                            m32r_breakpoint_len);
  96   if (insn == m32r_breakpoint)
  97     return 1;
  98
  99   /* If necessary, recognize more trap instructions here.  GDB only uses the
 100      one.  */
 101   return 0;
 102 }
 103
 104 void
 105 m32r_target::low_arch_setup ()
 106 {
 107   current_process ()->tdesc = tdesc_m32r;
 108 }
 109
 110 /* Support for hardware single step.  */
 111
 112 static int
 113 m32r_supports_hardware_single_step (void)
 114 {
 115   return 1;
 116 }
 117
 118 static struct usrregs_info m32r_usrregs_info =
 119   {
 120     m32r_num_regs,
 121     m32r_regmap,
 122   };
 123
 124 static struct regs_info myregs_info =
 125   {
 126     NULL, /* regset_bitmap */
 127     &m32r_usrregs_info,
 128   };
 129
 130 const regs_info *
 131 m32r_target::get_regs_info ()
 132 {
 133   return &myregs_info;
 134 }
 135
 136 struct linux_target_ops the_low_target = {
 137   linux_get_pc_32bit,
 138   linux_set_pc_32bit,
 139   NULL, /* breakpoint_from_pc */
 140   m32r_sw_breakpoint_from_kind,
 141   NULL,
 142   0,
 143   m32r_breakpoint_at,
 144   NULL, /* supports_z_point_type */
 145   NULL, /* insert_point */
 146   NULL, /* remove_point */
 147   NULL, /* stopped_by_watchpoint */
 148   NULL, /* stopped_data_address */
 149   NULL, /* collect_ptrace_register */
 150   NULL, /* supply_ptrace_register */
 151   NULL, /* siginfo_fixup */
 152   NULL, /* new_process */
 153   NULL, /* delete_process */
 154   NULL, /* new_thread */
 155   NULL, /* delete_thread */
 156   NULL, /* new_fork */
 157   NULL, /* prepare_to_resume */
 158   NULL, /* process_qsupported */
 159   NULL, /* supports_tracepoints */
 160   NULL, /* get_thread_area */
 161   NULL, /* install_fast_tracepoint_jump_pad */
 162   NULL, /* emit_ops */
 163   NULL, /* get_min_fast_tracepoint_insn_len */
 164   NULL, /* supports_range_stepping */
 165   NULL, /* breakpoint_kind_from_current_state */
 166   m32r_supports_hardware_single_step,
 167 };
 168
 169 /* The linux target ops object.  */
 170
 171 linux_process_target *the_linux_target = &the_m32r_target;
 172
 173 void
 174 initialize_low_arch (void)
 175 {
 176   init_registers_m32r ();
 177 }