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